02- MUX-2MD Interface Unit

MUX-2MD

Interface Unit

Instruction Manual

NR Electric Co., Ltd.

Preface

MUX-2MD Interface Unit IDate: 2012-08-24

Preface

Introduction

This guide and the relevant operating or service manual documentation for the equipment provide full information on safe handling, commissioning and testing of this equipment.

Documentation for equipment ordered from NR Electric Co., Ltd. is dispatched separately from manufactured goods and may not be received at the same time. Therefore this guide is provided to ensure that printed information normally present on equipment is fully understood by the recipient.

Before carrying out any work on the equipment, the user should be familiar with the contents of this manual and read relevant chapters carefully.

This chapter describes the safety precautions recommended when using the equipment. Before installing and using the equipment, this chapter must be thoroughly read and understood.

Health and Safety

The information in this chapter of the equipment documentation is intended to ensure that equipment is properly installed and handled in order to maintain it in a safe condition.

When electrical equipment is in operation, dangerous voltages will be present in certain parts of the equipment. Failure to observe warning notices, incorrect use, or improper use may endanger personnel and equipment and cause personal injury or physical damage.

Before working in the terminal strip area, the equipment must be isolated.

Proper and safe operation of the equipment depends on appropriate shipping and handling, proper storage, installation and commissioning, and on careful operation, maintenance and servicing. For this reason only qualified personnel may work on or operate the equipment.

Qualified personnel are individuals who:

z Are familiar with the installation, commissioning, and operation of the equipment and of the system to which it is being connected;

z Are able to safely perform switching operations in accordance with accepted safety engineering practices and are authorized to energize and de-energize equipment and to isolate, ground, and label it;

z Are trained in the care and use of safety apparatus in accordance with safety engineering practices;

z Are trained in emergency procedures (first aid).

Preface

MUX-2MD Interface Unit IIDate: 2012-08-24

Instructions and Warnings

The following indicators and standard definitions are used:

DANGER means that death, severe personal injury, or considerable equipment damage will occur if safety precautions are disregarded.

WARNING means that death, severe personal, or considerable equipment damage could occur if safety precautions are disregarded.

CAUTION means that light personal injury or equipment damage may occur if safety precautions are disregarded. This particularly applies to damage to the device and to resulting damage of the protected equipment.

WARNING!

The firmware may be upgraded to add new features or enhance/modify existing features, please make sure that the version of this manual is compatible with the product in your hand.

WARNING!

During operation of electrical equipment, certain parts of these devices are under high voltage. Severe personal injury or significant equipment damage could result from improper behavior.

Only qualified personnel should work on this equipment or in the vicinity of this equipment. These personnel must be familiar with all warnings and service procedures described in this manual, as well as safety regulations.

In particular, the general facility and safety regulations for work with high-voltage equipment must be observed. Noncompliance may result in death, injury, or significant equipment damage.

DANGER!

Never allow the current transformer (CT) secondary circuit connected to this equipment to be opened while the primary system is live. Opening the CT circuit will produce a dangerously high voltage.

WARNING!

z Exposed terminals Do not touch the exposed terminals of this equipment while the power is on, as the high voltage generated is dangerous

z Residual voltage Hazardous voltage can be present in the DC circuit just after switching off the power supply. It takes a few seconds for the voltage to discharge.

Preface

MUX-2MD Interface Unit IIIDate: 2012-08-24

CAUTION!

z Earthing The earthing terminal of the equipment must be securely earthed

z Operating environment The equipment must only be used within the range of ambient environment detailed in the specification and in an environment free of abnormal vibration.

z Ratings Before applying AC voltage and current or the power supply to the equipment, check that they conform to the equipment ratings.

z Printed circuit board Do not attach and remove printed circuit boards when the power supply to the equipment is on, as this may cause the equipment to malfunction.

z External circuit When connecting the output contacts of the equipment to an external circuit, carefully check the supply voltage used in order to prevent the connected circuit from overheating.

z Connection cable Carefully handle the connection cable without applying excessive force.

Copyright

Version: 1.00

P/N: EN_TXJK5004.0086.0001

Copyright NR 2011. All rights reserved

NR ELECTRIC CO., LTD.

69 Suyuan Avenue. Jiangning, Nanjing 211102, China

Tel: +86-25-87178185, Fax: +86-25-87178208

Website: www.nrelect.com, www.nari-relays.com

Email: [email protected]

We reserve all rights to this document and to the information contained herein. Improper use in particular reproduction and dissemination to third parties is strictly forbidden except where expressly authorized. The information in this manual is carefully checked periodically, and necessary corrections will be included in future editions. If nevertheless any errors are detected, suggestions for correction or improvement are greatly appreciated. We reserve the rights to make technical improvements without notice.

Preface

MUX-2MD Interface Unit IV Date: 2012-08-24

Table of Contents

MUX-2MD Interface Unit VDate: 2012-08-24

Table of Contents

Preface .....................................................................................................I

Table of Contents .................................................................................. V

1 Introduction .........................................................................................1

1.1 Application .......................................................................................................... 1

1.2 Features............................................................................................................... 1

2 Technical Data .....................................................................................3

2.1 General Specification ......................................................................................... 3

2.1.1 Electrical Specifications .........................................................................................................3

2.1.2 Optical Fiber Interfaces..........................................................................................................3

2.1.3 2048kb/s Electrical Interface..................................................................................................3

2.1.4 Mechanical Specifications......................................................................................................3

2.1.5 Ambient Temperature and Humidity.......................................................................................4

2.1.6 Type Test ...............................................................................................................................4

2.2 Certification......................................................................................................... 5

3 Operation Theory ................................................................................7

3.1 Signal Conversion Theory ................................................................................. 7

3.2 Code Format Conversion................................................................................... 7

4 Hardware ..............................................................................................9

4.1 Overview.............................................................................................................. 9

4.2 LED Indicators .................................................................................................. 10

4.3 Channel Interfaces ........................................................................................... 10

4.4 Wiring Terminals................................................................................................11

5 Installation .........................................................................................13

Table of Contents

MUX-2MD Interface Unit VI Date: 2012-08-24

5.1 General .............................................................................................................. 13

5.2 Safety Instructions ........................................................................................... 13

5.3 Checking the Shipment.................................................................................... 13

5.4 Material and Tools Required............................................................................ 14

5.5 Device Location and Ambient Conditions...................................................... 14

5.6 Mechanical Installation .................................................................................... 14

5.7 Electrical Installation and Wiring .................................................................... 15

5.7.1 Grounding Guidelines..........................................................................................................15

5.7.2 Cubicle Grounding...............................................................................................................15

5.7.3 Ground Connection on the Device.......................................................................................16

5.7.4 Grounding Strips and their Installation .................................................................................17

5.7.5 Guidelines for Wiring ...........................................................................................................17

5.7.6 Wiring for Optical Fiber Cables............................................................................................18

6 Commissioning .................................................................................19

6.1 General .............................................................................................................. 19

6.2 Safety Instructions ........................................................................................... 19

6.3 Product Checks ................................................................................................ 20

6.3.1 With the Device De-energized .............................................................................................20

6.3.2 With the Device Energized ..................................................................................................21

6.3.3 Final Checks........................................................................................................................21

7 Maintenance.......................................................................................23

7.1 Maintenance Schedule ..................................................................................... 23

7.2 Regular Testing................................................................................................. 23

7.3 Failure Tracing and Repair............................................................................... 23

7.4 Cleaning ............................................................................................................ 23

8 Decommissioning and Disposal ......................................................25

8.1 Decommissioning............................................................................................. 25

8.1.1 Switching off ........................................................................................................................25

Table of Contents

MUX-2MD Interface Unit VIIDate: 2012-08-24

8.1.2 Disconnecting cables...........................................................................................................25

8.1.3 Dismantling..........................................................................................................................25

8.2 Disposal............................................................................................................. 25

9 Manual Version History.....................................................................27

Table of Contents

MUX-2MD Interface Unit VIIIDate: 2012-08-24

1 Introduction

MUX-2MD Interface Unit 1Date: 2012-08-24

1 Introduction

1.1 Application

The MUX-2MD interface unit is used as a communication interface device between the RCS-900/PCS-900 series line differential relay (e.g. PCS-931), the RCS-900/PCS-900 series permissive pilot protection relay (e.g. PCS-902), the RCS-900/PCS-900 series power system stability control relay (e.g. PCS-992), or the FOX-41 series interface unit (e.g. FOX-41B) and the digital communication multiplexer via 2048kbit/s interface (refer to ITU-G.703), such as a synchronous digital hierarchy (SDH) device and so on.

Figure 1.1-1 Typical application of this device

As shown in above figure, this device is usually mounted in dispatch cubicle. It is connected with protection relay via single mode optical fiber, and it is connected to a 2048kbit/s interface of SDH multiplexer by a dedicated coaxial cable with 75ohm characteristic impedance.

1.2 Features

This device is an IEC standard 1U high and 19 wide rack with modular structure. It uses an integral plug board which can either be fitted on front or rear panel on a case-by-case basis. It has features of compact design, high security, flexibility, convenience and low power dissipation. As a result, moisture proof is improved, ensuring a long life even in extreme mechanical and ambient conditions.

1 Introduction

MUX-2MD Interface Unit 2 Date: 2012-08-24

2 Technical Data


2 Technical Data

2.1 General Specification

2.1.1 Electrical Specifications

Power Supply

Standard IEC60255-11: 2008

Rated voltage -48Vdc

Variation -32Vdc ~ -63Vdc

Permissible ripple voltage Max 15% of the rated voltage (DC power supply)

Burden Approx. 10W

2.1.2 Optical Fiber Interfaces

Connector type FC/PC

Transmission medium 9/125m single mode fiber cable

Wavelength 1310nm

Transmission power -10.0dBm ~ -16dBm

Reception sensitivity -35.0dBm Transmission distance < 10km

2.1.3 2048kb/s Electrical Interface

Connector Type BNC

Transmission medium Coaxial cable with 75ohm characteristic impedance

Communication speed 2048kbit/s 50ppm

Transmission distance < 50m

Safety level Isolation to ELV level

2.1.4 Mechanical Specifications

Enclosure dimensions 482.6044.40273.00 (WHD, unit: mm)

Trepanning dimensions 450.0044.50, M5 screw (WH, unit: mm)

Mounting way Flush mounted

Weight per device Approx. 2.0kg

Local HMI panel 10 LED indicators

Panel language Optional: English, Chinese

Housing material Aluminum

Housing color Silver grey

Location of terminals Rear panel of the device

Protection class IEC60225-1: 2009

Front side: IP40, up to IP51

Rear side, connection terminals: IP20

Other Sides: IP30

2 Technical Data


2.1.5 Ambient Temperature and Humidity

Standard IEC60225-1: 2009

Operating temperature range -40C ~ +70C

Transport and storage temperature range -40C ~ +70C

Permissible humidity 5% ~ 95%, condensation not permissible

Altitude < 3000m

2.1.6 Type Test

2.1.6.1 Environmental Tests

Dry cold test IEC60068-2-1: 2007, 16h at -25C

Dry heat test IEC60068-2-2: 2007, 16h at +55C

Damp heat test IEC60068-2-78: 2001, 10 days, 93%RH, +55C

Cyclic temperature with

humidity test

IEC60068-2-30: 2005, six (12+12hours) cycles, 95%RH,

low temperature +25C, high temperature +55C

2.1.6.2 Mechanical Tests

Vibration test IEC60255-21-1:1988, Class I

Shock test IEC60255-21-2:1988, Class I

Bump test IEC60255-21-2:1988, Class I

Seismic test IEC60255-21-3:1988, Class I

2.1.6.3 Electrical Tests

Dielectric test IEC60255-27: 2005, test voltage: 2kV, 50Hz, 1min

Impulse voltage test IEC60255-5: 2000, test voltage: 5kV, unipolar impulses, waveform 1.2/50s,

source energy 0.5J

Overvoltage category IEC60255-5: 2000, Class III

Insulation measurement IEC60255-5: 2000, insulation resistance >100M @ 500Vdc

Pollution degree IEC60225-1: 2009, Class II

2.1.6.4 Electromagnetic Compatibility

1MHz burst disturbance tests

- Common mode

- Differential mode

IEC60255-22-1: 2007, Class III

2.5kV

1.0kV

Electrostatic discharge tests

- For contact discharge

- For air discharge

IEC60255-22-2: 2008, Class IV

8.0kV

15.0kV

Radio frequency interference tests

- Frequency sweep

- Radiated amplitude-modulated

- Spot frequency

- Radiated amplitude-modulated

- Radiated pulse-modulated

IEC60255-22-3: 2007, Class III

10V/m(RMS), f=801000MHz

10Vm(RMS), f=80/160/450/900MHz

10Vm(RMS), f=900MHz

2 Technical Data


Fast transient disturbance tests

- Power supply, I/O & Earth terminals

- Communication terminals

IEC60255-22-4: 2008, Class IV

4kV, 2.5kHz, 5/50ns

2kV, 5.0kHz, 5/50ns

Surge immunity tests

- Power supply, AC inputs, I/O terminals

IEC60255-22-5: 2008, Class IV

1.2/50us,

4kV, line-to-ground

2kV, line-to-line

Conducted RF electromagnetic disturbance

- Power supply, AC, I/O, Comm. terminals

IEC60255-22-6: 2001, Class III

10V(RMS), 150kHz~80MHz

Power frequency field immunity IEC60255-22-7: 2003, Class A

10s

300V, line-to-ground

150V, line-to-line

Conducted emission limits IEC60255-25: 2000, Class A

Radiated emission limits IEC60255-25: 2000, Class A

Auxiliary power supply performance

- Voltage dips

- Voltage short interruptions

IEC60255-11: 2008

Up to 500ms for dips to 40% of rated voltage

without reset

100ms for interruption without rebooting

Power frequency magnetic field immunity IEC61000-4-8: 2001, Class V

100A/m for 1min

1000A/m for 3s

Pulse magnetic field immunity IEC61000-4-9: 2001, Class V

6.4/16us, 1000A/m for 3s

Damped oscillatory magnetic field immunity IEC61000-4-10: 2001, Class V

100kHz & 1MHz 100A/m

Ring wave immunity

- Power supply, I/O terminals

IEC61000-4-12: 2006, Class III

1MHz

2kV, line-to-ground

1kV, line-to-line

2.2 Certification

z ISO9001: 2008 z ISO14001: 2004 z OHSAS18001: 2007 z ISO10012: 2003 z CMMI L4 z EMC: 2004/108/EC, EN50263: 1999 z Products safety (PS): 2006/95/EC, EN61010-1: 2001

2 Technical Data


3 Operation Theory


3 Operation Theory

3.1 Signal Conversion Theory

The MUX-2MD interface unit can not work as an independent device. This device can cooperate with a RCS-900/PCS-900 series line differential relay, a RCS-900/PCS-900 series permissive pilot protection relay, a RCS-900/PCS-900 series power system stability control relay or a FOX-41 series interface unit.

This device is consisted of an optoelectronic conversion module, a code format conversion module, a code polarity conversion module, an optical interface and an electrical interface.

The operation theory demonstration of the MUX-2MD is shown in Figure 3.1-1.

O/E

E/O

Code FormatConversion

Code PolarityConversion

O RX

O TX E RX

E TX

OptoelectronicConversion

Figure 3.1-1 Operation theory demonstration of this device

The optoelectronic conversion module is used to realize the conversion of optical signals and electrical signals. It is connected with the optical interface which is used as interface for connecting with a protection relay. The code format conversion module is used to convert the code format of optical signals from the protection relay as the code format which is complied with the ITU-G.703 of the 2048kbit/s interface. And the code polarity can be inversed through the code polarity conversion module. The 2048kbit/s electrical interface can connect with the interface of SDH multiplexer by a dedicated coaxial cable with 75ohm characteristic impedance.

3.2 Code Format Conversion

Before outputting optical signals to the protection relay, the digital representation of receiving signals (from SDH multiplexer) goes to the decoder for HDB3 decoding so as to comply with the signal data format and rate of protection relay.

The encoder is used to accept digital data been processed by optoelectronic converter (from the protection relay) and encode it into a format of HDB3 encoding rules such that it can:

z Be efficiently transmitted over coaxial cable at the E1 data rate; z Be reliably received by SDH multiplexer of the E1 data link via 2048kbit/s interface; z Comply with the ITU-T G.703 pulse template requirements, for E1 applications.

3 Operation Theory


The HDB3 (high density bipolar order 3) is a bipolar signaling technique (i.e. relies on the transmission of both positive and negative pulses). It is based on alternate mark inversion (AMI), but extends this by inserting violation codes whenever there is a run of zeros (4 or more zeros).

As illustrated in following table, a V represents a violation of the HDB3 code, and a B represents a bipolar pulse of correct polarity. HDB3 substitutes bipolar code for 4 consecutive zeros according to the following rule:

z If the polarity of the immediate preceding pulse is (-) and there have been an odd (even) number of logic 1 pulses since the last substitution, each group of 4 consecutive zeros is coded as 000- (+00+);

z If the polarity of the immediate preceding pulsed is (+) then the substitution is 000+ (-00-) for odd (even) number of logic 1 pulse since the last substitution.

Transmitted data HDB3 Encoded Pattern

0 0

1 Alternate Mark Inversion (AMI)

0000 000V (three zeros and a violation)

0000 0000 B00V B00V

Example of HDB3 encoding:

The pattern of bits 0 0 0 0 1 0 1 1 1 0 0 0 0 0 0 1

HDB3 (-): 0 0 0 - + 0 - + - + 0 0 + 0 0 -

HDB3 (+): 0 0 0 + - 0 + - + - 0 0 - 0 0 +

An illustration of the ITU-T G.703 pulse template requirements is presented as below.

269 ns(244 + 25)

194 ns(244 - 50)

244 ns

219 ns(244 - 25)

488 ns(244 + 244)

0%

50%

V = 100%

T1818840-02

Nominal pulse

NOTE: V corresponds to the nominal peak value.

Figure 3.2-1 Illustration of the ITU-T G.703 pulse template for E1 application

4 Hardware


4 Hardware

4.1 Overview

The following figure shows the front panel and the rear panel of this device.

Figure 4.1-1 Front panel and rear panel of this device

4 Hardware


4.2 LED Indicators

The LED indicators on the front panel and rear panel of this device are shown as below.

Front Panel

PWR HEALTHY O PORT ALM E PORT ALMPWR HEALTHY O PORT ALM E PORT ALM CONFIG A CONFIG B

Rear Panel

Figure 4.2-1 LED indicators of this device

The indications of these LED indicators are listed as below.

LED Indicator LED Color Indication Description

PWR Green Whether the power supply is in normal operation status; if the power

supply is abnormal, the LED PWR will be off.

HEALTHY Green Whether this device is in normal operation status; if this device is

abnormal, the LED HEALRHY will be off.

O PORT ALM Red Whether the optical reception channel is abnormal; if the optical

reception channel is abnormal, the LED O PORT ALM will be on.

E PORT ALM Red Whether the electrical reception channel is abnormal; if the electrical

reception channel is abnormal, the LED E PORT ALM will be on.

CONFIG A Green It is used to indicate the operation mode of this device.

CONFIG B Green It is used to indicate the operation mode of this device.

The LED CONFIG A and LED CONFIG B are used to indicate the operation mode of this device. If this device is in normal operation situation, the LED CONFIG A and LED CONFIG B are off.

4.3 Channel Interfaces

The channel interfaces on the rear panel of this device are shown as below.

Figure 4.3-1 Channel interfaces of this device

The optical channel supports the FC/PC type connector, and the electrical channel supports the BNC type port.

4 Hardware


Channel Sign Description

O RX The reception interface of the optical channel. Optical

O TX The transmission interface of the optical channel.

E RX The reception interface of the electrical channel. Electrical

E TX The transmission interface of the electrical channel.

4.4 Wiring Terminals

Other wiring terminals of this device on the rear panel of this device are shown as below.

-48V 0V

Figure 4.4-1 Wiring terminals of this device

The wiring terminal definition is listed as below.

Sign Description

-48V The -48V input of the power supply.

0V The 0V input of the power supply.

The grounded terminal.

4 Hardware


5 Installation


5 Installation

5.1 General

This device must be shipped, stored and installed with the greatest care.

Choose the place of installation such that the communication interface and the HMI on the front of the device are easily accessible.

Air must circulate freely around this device. Observe all the requirements regarding place of installation and ambient conditions given in this instruction manual.

Take care that the external wiring is properly brought into this device and terminated correctly and pay special attention to grounding. Strictly observe the corresponding guidelines contained in this section.

5.2 Safety Instructions

This section contains safety information. Warning signs are presented which attend the user to be careful during certain operations in order to avoid human injuries or damage to equipment.

DANGER! Strictly follow the company and country safety regulations. Working in a high

voltage environment requires serious approach to avoid human injuries and damage to equipment.

DANGER! Never connect or disconnect a wire or a connector to or from a device during

normal operation. Hazardous voltages and currents are present that may be lethal. Operation may be disrupted and device and measuring circuitry may be damaged.

DANGER! Always connect the device to ground, regardless of the operating conditions.

This also applies to special occasions such as bench testing, demonstrations and off-site configuration. Operating the device without proper grounding may damage both terminal and measuring circuitry, and may cause injuries in case of an accident.

5.3 Checking the Shipment

Check that the consignment is complete immediately upon receipt. Notify the nearest NR Company or agent, should departures from the delivery note, the shipping papers or the order be found.

Visually inspect all the material when unpacking it. When there is evidence of transport damage, lodge a claim immediately in writing with the last carrier and notify the nearest NR Company or

5 Installation


agent.

If this device is not going to be installed immediately, store all the parts in their original packing in a clean dry place at a moderate temperature. The humidity at a maximum temperature and the permissible storage temperature range in dry air are listed in Section 2.1.5.

5.4 Material and Tools Required

The necessary mounting kits will be provided, including screws, pincers and assembly instructions.

A suitable drill and spanners are required to secure the cubicles to the floor using the plugs provided (if this device is mounted in cubicles).

5.5 Device Location and Ambient Conditions

The place of installation should permit easy access especially to front of the device, i.e. to the human machine interface of this device.

There should also be free access at the rear of this device for additions and replacement of electronic boards.

Since every piece of technical equipment can be damaged or destroyed by inadmissible ambient conditions, such as:

1. The location should not be exposed to excessive air pollution (dust, aggressive substances).

2. Severe vibration, extreme changes of temperature, high levels of humidity, surge voltages of high amplitude and short rise time and strong induced magnetic fields should be avoided as far as possible.

3. Air must not be allowed to circulate freely around this device.

This device can in principle be mounted in any attitude, but it is normally mounted vertically (visibility of markings).

WARNING! Excessively high temperature can appreciably reduce the operating life of

this device.

5.6 Mechanical Installation

This device is made of a single layer 1U height 19" chassis. The following figure shows the dimensions of this device for reference in mounting.

5 Installation


Figure 5.6-1 Dimensions of this device and the cut-out in the cubicle (unit: mm)

NOTE! It is necessary to leave enough space top and bottom of the cut-out in the cubicle

for heat emission of this device.

In the case of equipment supplied in cubicles, place the cubicles on the foundations that have been prepared. Take care while doing so not to jam or otherwise damage any of the cables that have already been installed. Secure the cubicles to the foundations.

5.7 Electrical Installation and Wiring

5.7.1 Grounding Guidelines

Switching operations in HV installations generate transient over voltages on control signal cables. There is also a background of electromagnetic RF fields in electrical installations that can induce spurious currents in the devices themselves or the leads connected to them.

All these influences can influence the operation of electronic apparatus.

On the other hand, electronic apparatus can transmit interference that can disrupt the operation of other apparatus.

In order to minimize these influences as far as possible, certain standards have to be observed with respect to grounding, wiring and screening.

NOTE! All these precautions can only be effective if the station ground is of good quality.

5.7.2 Cubicle Grounding

The cubicle must be designed and fitted out such that the impedance for RF interference of the ground path from the electronic device to the cubicle ground terminal is as low as possible.

5 Installation


Metal accessories such as side plates, blanking plates etc., must be effectively connected surface-to-surface to the grounded frame to ensure a low-impedance path to ground for RF interference. The contact surfaces must not only conduct well, they must also be non-corroding.

NOTE! If the above conditions are not fulfilled, there is a possibility of the cubicle or parts

of it forming a resonant circuit at certain frequencies that would amplify the transmission of interference by the devices installed and also reduce their immunity to induced interference.

Movable parts of the cubicle such as doors (front and back) or hinged equipment frames must be effectively grounded to the frame by three braided copper strips (see Figure 5.7-1).

The metal parts of the cubicle housing and the ground rail are interconnected electrically conducting and corrosion proof. The contact surfaces shall be as large as possible.

NOTE! For metallic connections please observe the voltage difference of both materials

according to the electrochemical code.

The cubicle ground rail must be effectively connected to the station ground rail by a grounding strip (braided copper).

Figure 5.7-1 Cubicle grounding system

5.7.3 Ground Connection on the Device

There is a ground terminal on the rear panel (see Figure 5.7-2), and the ground braided copper strip can be connected with it. Take care that the grounding strip is always as short as possible. The main thing is that the device is only grounded at one point. Grounding loops from unit to unit are not allowed.

There are some ground terminals on some connectors of this device. All the ground terminals are connected in the cabinet of this device. So, the ground terminal on the rear panel (see Figure 5.7-2)

5 Installation


is the only ground terminal of this device.

Figure 5.7-2 Ground terminal of this device

5.7.4 Grounding Strips and their Installation

High frequency currents are produced by interference in the ground connections and because of skin effect at these frequencies, only the surface region of the grounding strips is of consequence.

The grounding strips must therefore be of (preferably tinned) braided copper and not round copper conductors, as the cross-section of round copper would have to be too large.

Proper terminations must be fitted to both ends (press/pinch fit and tinned) with a hole for bolting them firmly to the items to be connected.

The surfaces to which the grounding strips are bolted must be electrically conducting and non-corroding.

The following figure shows the ground strip and termination.

Figure 5.7-3 Ground strip and termination

5.7.5 Guidelines for Wiring

There are several types of cables that are used in the connection of this device: braided copper cable, serial communication cable etc. Recommendation of the cables:

z Grounding: braided copper cable, 2.5mm2 ~ 6.0mm2 z Power supply, binary inputs & outputs: brained copper cable, 1.5mm2 ~ 2.5mm2 z Serial communication: coaxial cable with 75ohm characteristic impedance z Optical fiber: FC/PC

5 Installation


5.7.6 Wiring for Optical Fiber Cables

Laying optical fiber cables

Pay attention when laying optical fiber cables not to bend or twist them when unrolling them or to damage the protective caps etc., on the ends. Should in spite of taking all precautions, a cable be damaged, it must be repaired immediately. Strictly observe the minimum permissible bending radius.

WARNING! The bending radius influences the attenuation of an optical fiber cable.

Since depending on its mechanical constructions, the characteristics of an optical fiber cable are influenced to a greater or lesser extent by the ambient temperature, the temperature must be taken into consideration when determining the route. The temperature conditions for laying or rewinding an optical fiber cable are only fulfilled, if the cable was not exposed to a temperature outside the permissible range during the preceding 12 hours.

WARNING! It is recommended that optical fiber cables be laid in plastic cable ducts.

6 Commissioning


6 Commissioning

6.1 General

This device is fully numerical in their design, implementing all functions in software. This device employs a high degree of self-checking and in the unlikely event of a failure, will give an alarm.

To commission this device, it is only necessary to verify that the hardware is functioning correctly and the application-specific software settings have been applied to this device.

Before carrying out any work on this device, the user should be familiar with the contents of the safety and technical data sections and the ratings on this devices rating label.

6.2 Safety Instructions

WARNING! Hazardous voltages are present in this electrical equipment during operation.

Non-observance of the safety rules can result in severe personal injury or property damage.

WARNING! Only the qualified personnel shall work on and around this equipment after

becoming thoroughly familiar with all warnings and safety notices of this manual as well as with the applicable safety regulations.

Particular attention must be drawn to the following:

z The earthing screw of the device must be connected solidly to the protective earth conductor before any other electrical connection is made.

z Hazardous voltages can be present on all circuits and components connected to the supply voltage or to the measuring and test quantities.

z Hazardous voltages can be present in the device even after disconnection of the supply voltage (storage capacitors!)

z The limit values stated in the technical data (Chapter 2) must not be exceeded at all, not even during testing and commissioning.

WARNING! Primary test may only be carried out by qualified personnel, who are familiar

with the commissioning of this device, the operation of the plant and safety rules and regulations (switching, earthing, etc.).

6 Commissioning


6.3 Product Checks

These product checks cover all aspects of this device which should be checked to ensure that it has not been physically damaged prior to commissioning, is functioning correctly and all input quantity measurements are within the stated tolerances.

6.3.1 With the Device De-energized

6.3.1.1 Visual Inspection

After unpacking the product, check for any damage to the device case. If there is any damage, the internal module might also have been affected, contact the vendor. The following listed items are necessary.

z Device panel Carefully examine the device panel, equipment inside and other parts inside to see that no physical damage has occurred since installation.

The rated information of this device should be checked to ensure it is correct for the particular installation.

z Label Check all the isolator binary inputs, terminal blocks, indicators, switches and push buttons to make sure that their labels meet the requirements of this project.

6.3.1.2 Insulation Test (if required)

Insulation resistance tests are only necessary during commissioning if it is required for them to be done and they have not been performed during installation.

Isolate all wiring from the earth and test the isolation with an electronic or brushless insulation tester at a DC voltage not exceeding 500V, The circuits need to be tested should include:

z DC power supply z Communication interfaces The insulation resistance should be greater than 100M at 500V.

Test method:

To unplug all the terminals sockets of this device, and do the Insulation resistance test for each circuit above with an electronic or brushless insulation tester.

On completion of the insulation resistance tests, ensure all external wiring is correctly reconnected to this device.

6.3.1.3 External Wiring

Check that the external wiring is correct to the scheme diagram. Ensure as far as practical that phase rotation appears to be as expected.

6 Commissioning


Check the wiring against the schematic diagram for the installation to ensure compliance with the customers normal practice.

6.3.1.4 Power Supply

This device only can be operated under the power supply depending on the nominal power supply rating. The incoming voltage must be within the operating range specified in Section 2.1.1, before energizing this device, measure the auxiliary supply to ensure it within the operating range.

Other requirements to the power supply are specified in Section 2.1.1. See this section for further details about the parameters of the power supply.

6.3.2 With the Device Energized

The following groups of checks verify that this device is functioning correctly and should be carried out with the power supply applied to this device.

6.3.2.1 Light Emitting Diodes

On power up, the LED HEALTHY should be on for indicating that this device is healthy, and the LED PWR should be on if the corresponding power supply is in service.

Test other LED indicators with the code conversion and communication function.

6.3.2.2 Testing the Interface Conversion Function

This test is for checking the interface conversion function of this device.

The following figure shows the demonstration testing system for checking this function.

Figure 6.3-1 Demonstration testing system

If the two MUX-2MD devices are in normal operation situation, the protection relays can communicate each other.

NOTE! In the check process, to ensure the optical communication channels between this

device and the protection device are reliably connected.

6.3.3 Final Checks

After the above tests are completed, remove all test or temporary shorting leads, etc. If it has been necessary to disconnect any of the external wiring from this device in order to perform the wiring verification tests, it should be ensured that all connections are replaced in accordance with the relevant external connection or scheme diagram.

6 Commissioning


7 Maintenance


7 Maintenance

7.1 Maintenance Schedule

It is recommended that products supplied by NR receive periodic monitoring after installation. In view of the critical nature of this device and their infrequent operation, it is desirable to confirm that they are operating correctly at regular intervals.

7.2 Regular Testing

Check whether the LED indicators on the front panel of this device indicate the correct state of this device, when this device is in normal operation.

7.3 Failure Tracing and Repair

When a failure is detected by supervision, the ALARM and HEALTHY LED indicators will show the abnormal operation information.

When a failure is detected during regular testing, confirm the following:

z Whether the equipment connected to this device operates normally. z Whether the optical fiber is connected correctly and tightly. z Whether the power supply voltage is in the range.

7.4 Cleaning

Before cleaning this device ensure that all power supplies are isolated to prevent any chance of an electric shock whilst cleaning. Use a smooth cloth to clean the front panel. Do not use abrasive material or detergent chemicals.

7 Maintenance


8 Decommissioning and Disposal



8.1 Decommissioning

8.1.1 Switching off

To switch off this device, switch off the external miniature circuit breaker of the power supply.

8.1.2 Disconnecting cables

Disconnect the cables in accordance with the rules and recommendations made by relational department.

DANGER! Before disconnecting the power supply cables that connected with the power

supply module of this device, make sure that the external miniature circuit breaker of the power supply is switched off.

8.1.3 Dismantling

The rack of this device may now be removed from the system cubicle, after which the cubicles may also be removed.

DANGER! When the station is in operation, make sure that there is an adequate safety

distance to live parts, especially as dismantling is often performed by unskilled personnel.

8.2 Disposal

In every country there are companies specialized in the proper disposal of electronic waste.

NOTE! Strictly observe all local and national regulations when disposing of the device.

9 Manual Version History



In the current version of the instruction manual, several descriptions on existing features have been modified.

Manual version and modification history records

Manual Version

Source New

Software

Version Date Description of change

Beta 1.00 1.00 2012-08-24 Form the original manual.



PrefaceTable of Contents1 Introduction1.1 Application1.2 Features

2 Technical Data2.1 General Specification2.1.1 Electrical Specifications2.1.2 Optical Fiber Interfaces2.1.3 2048kb/s Electrical Interface2.1.4 Mechanical Specifications2.1.5 Ambient Temperature and Humidity2.1.6 Type Test2.1.6.1 Environmental Tests2.1.6.2 Mechanical Tests2.1.6.3 Electrical Tests2.1.6.4 Electromagnetic Compatibility

2.2 Certification

3 Operation Theory3.1 Signal Conversion Theory3.2 Code Format Conversion

4 Hardware4.1 Overview4.2 LED Indicators4.3 Channel Interfaces4.4 Wiring Terminals

5 Installation5.1 General5.2 Safety Instructions5.3 Checking the Shipment5.4 Material and Tools Required5.5 Device Location and Ambient Conditions5.6 Mechanical Installation5.7 Electrical Installation and Wiring5.7.1 Grounding Guidelines5.7.2 Cubicle Grounding5.7.3 Ground Connection on the Device5.7.4 Grounding Strips and their Installation5.7.5 Guidelines for Wiring5.7.6 Wiring for Optical Fiber Cables

6 Commissioning6.1 General6.2 Safety Instructions6.3 Product Checks6.3.1 With the Device De-energized6.3.1.1 Visual Inspection6.3.1.2 Insulation Test (if required)6.3.1.3 External Wiring6.3.1.4 Power Supply

6.3.2 With the Device Energized6.3.2.1 Light Emitting Diodes6.3.2.2 Testing the Interface Conversion Function

6.3.3 Final Checks

7 Maintenance7.1 Maintenance Schedule7.2 Regular Testing7.3 Failure Tracing and Repair7.4 Cleaning

8 Decommissioning and Disposal8.1 Decommissioning8.1.1 Switching off8.1.2 Disconnecting cables8.1.3 Dismantling

8.2 Disposal


Documents

02- MUX-2MD Interface Unit