W-Series solid dielectric single phase recloser

W-Series solid dielectric single phase recloser

The W-Series solid dielectric single phaseautomatic circuit recloser (also known as acircuit breaker) represents Nu-LecIndustries’ commitment to improvedproducts and ongoing productdevelopment. It provides the features of atraditional recloser, plus the benefits of anup to date design optimised for automation,remote control and monitoring, now or inthe future.

The development of this product wasdriven by customer demand for improvedreturn on capital investment in thedistribution network. After carefullyevaluating customers’ needs, the W-Seriessolid dielectric single phase recloser wasdeveloped to achieve optimumperformance and reliability, making use ofthe very latest available technology in soliddielectrics, vacuum interruption andmicroelectronics. The result is acompetitive world-class product of whichwe are justly proud.

In the past, distribution equipment such asreclosers have been purchased only tosupport load growth. Today yourcustomers, electricity consumers, aredemanding reduced outages and lowertariffs. We at Nu-Lec Industries arecontinually working to provide advancedequipment needed for tomorrow’scompetitive electricity distribution system.

By using this technologically advancedequipment, operating costs will bereduced, revenue will be increased throughreduced outages and capital works can bedeferred through better management ofexisting plant.

In addition to automatic circuit reclosers,the Nu-Lec Industries family of switchgearincludes a range of remotely controlled andmonitored pole mounted load breakswitches and sectionalisers as well asremote control and monitoring software.This product family is a complete solutionfor distribution system automation.

Reduced Purchase Cost• The V23 FSK modem and Remote Terminal Unit (RTU) are included in the

standard equipment. No additional RTU, modem, power supplies, batteries,wiring, connectors or enclosures are required.

Reduced Installation Costs• Commissioning of the unit is simple. Configuration of the device is menu

driven from the Operator Control Panel.• Pole mounting brackets are provided in the standard package. Lightning

arrester mounting is optional.

Reduced Operating Costs• The integral protection relay provides fast isolation of faults, reducing

damage.• The recloser constantly monitors line current and voltage without the need for

additional statistical measurement devices. This data can then be used forforward planning and optimisation of existing plant. This will reducedistribution system losses.

• Long lifetime, low maintenance equipment reduces lifetime cost. The soliddielectric construction ensures a long life, low maintenance product.

Improved Environmental Aspects• Enclosing the vacuum interrupter in a solid epoxy bushing eliminates the need

for oil or gas insulation.

DSA/SCADA CompatibilityWhen used with a compatible Distribution Automation System (DSA) or SCADAsystem, Nu-Lec Industries automatic circuit reclosers support remote control andmonitoring to provide the following advantages:• Information on recloser status and fault current values transmitted to system

control allows fast location of the faulted line section, reducing the travellingtime of line crews.

• This same information allows informed remote or automatic switching of lines,which reduces the area affected and quickly restores supply. Quality of supplyis improved as a result.

• Reclosers can be configured and settings managed from system control,without technicians having to visit each individual recloser in the field, tochange configuration settings. This allows a reduction in staffing andimproved system integrity.

Increased Revenue• Supply can be quickly restored to unaffected areas, resulting in less outage

time and therefore increased revenue.

Deferred Capital Works• Remotely controlled and monitored automatic circuit reclosers improve

knowledge of the system and enhance system control. Feeder and substationload can then be remotely managed and switched, providing cross re-inforcement of substations and improving utilisation of existing plant.Purchase of new plant can then most likely be deferred for a considerableperiod of time.

Introduction

2 Nu-Lec IndustriesW-Series

The W-Series solid dielectric single phase automatic circuitrecloser uses a vacuum interrupter, contained in an epoxy casting,eliminating the need for insulants like oil and gas. The cyclo-aliphatic epoxy resin casting is bolted onto the lid of a 316 gradestainless steel tank that houses the mechanism.Monitoring and control of the recloser is performed by the field proven Pole TopControl and Communications cubicle (PTCC), of which many thousand are inservice worldwide. The PTCC houses the Operator Control Panel andmicroelectronics that provide the protection functions. It is normally located lowerdown the pole for ease of access and is connected to the circuit breaker by adetachable control cable. The circuit breaker and PTCC together form a remotelycontrolled and monitored automatic circuit recloser.

The recloser is operated by a magnetic actuator which produces a positive openingand closing action. Switching occurs when a controlled pulse is sent through theopen/close actuator from a storage capacitor in the PTCC. When closed, the switchis latched magnetically. A spring loaded pushrod provides contact loading on theinterrupter.

A current transformer (CT) and a capacitive voltage transformer (CVT) are mouldedin the CT-housing. These are monitored by the PTCC for remote monitoring anddisplay. The PTCC requires an auxiliary A.C. supply. A control cable connects thePTCC to the bottom of the circuit breaker through a covered plug/socket sealingarrangement on both the PTCC and the tank.

The recloser is supplied with copper stems or optional cable clamp connectors.Mounting brackets for lightning arresters are built into the tank.

The recloser contact position is shown by a large, clearly visible external pointer.

A hookstick can be used to engage the manual trip ring to trip and lockout therecloser from the ground. The mechanical trip ring has two positions. In the “up”position normal operation takes place. In the “down” position the recloser is trippedand both mechanically and electronically locked open.

The PTCC interfaces to the recloser via the control cable and connects to theSwitch Control Entry Module (SCEM) in the back of the tank. The SCEM usesEEPROM memory to store all relevant calibration data, ratings and number ofoperations conducted by the tank. The SCEM also provides the first stage ofelectrical isolation and shorting electronics to short the CT and CVT in the eventthe control cable is disconnected while current is flowing through the recloser.

1. X-Side Terminal2. Vacuum

Interrupter3. Contacts4. Epoxy Housing5. Push Rod6. Earthing Point7. SCEM Card8. Magnetic actuator9. Stainless Steel

Tank

10. Pointer11. Manual Trip Ring12. Stainless Steel

Lid13. Current

Transformer14. Capacitive

VoltageTransformer

15. I-SideTerminal

Legend

Recloser Operation andOverview

Cross section of the W-Series solid dielectric singlephase recloser

W-Series solid dielectric recloser casting

1

10

3

2

4

5

6

7

8

9

11

12

13

15

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3Nu -Lec Industries W-Series

The advanced protection, data logging and communicationsabilities of the W-Series automatic circuit recloser are madepossible by the technology housed in the control andcommunications cubicle. It has been designed especially foroutdoor, pole mounted operation and is normally mounted low onthe pole for ease of access by maintenance personnel.The cubicle is insulated and designed to minimise any temperature rise resultingfrom solar heating. An internal equipment panel is used to mount all the equipment,including the batteries, storage capacitors, mains transformer, low voltage circuitbreakers, Control And Protection Module (CAPM), Operator Control Panel andradio or modem. These components are carefully located so that the heatgenerating parts are at the top, while the battery is at the bottom to keep it cool. Inthis way a battery life of five years can be achieved.

All weather access is provided to the Operator Control Panel through a lockabledoor on the front of the control cubicle. Vents are screened against vermin entryand the door is sealed against the outer with a rubber extrusion. All electronic partsare well protected from entry of moisture and condensation ensuring a long lifetime.

Three models of control and communications cubicle are available, Tropical,Moderate and Temperate. The Tropical version is well ventilated and is suitable forclimates where the ambient temperature can reach 50°C and only occasionallygoes below 0°C, with a lower limit of -10°C.

The Moderate version has reduced ventilation and is used where temperaturesrarely go above 40°C and occasionally go below -5°C, with a lower limit of -15°C.

The Temperate model has a heater installed, making it suitable for climates wherethe temperature rarely goes above 40°C but can fall as low as -30°C.

All three cubicles are fitted with the same electronics and incorporate the functionsof an overcurrent protection relay, a reclose relay and a remote terminal unit.Additionally, the electronics measure line current, voltage, real and reactive power,fault currents and stores these for transmission or off-line analysis.

A unique feature of the Nu-Lec Industries automatic circuit recloser is the built-inmicroprocessor controlled power supply. This provides uninterrupted operation ofnot only the circuit breaker and protection relay, but also the communications radioor modem. No other power supplies are required for connection into your SCADAor Distribution Automation System.

Due to careful design the efficiency of all parts is extremely high, allowing a batteryhold up time of five days after auxiliary supply failure (from fully charged battery,excluding telemetry radio or modem usage). The architecture used has theadvantage that the circuit breaker operation is independent of the high voltagesupply, relying on a set of batteries charged by the auxiliary supply.

Due to sophisticated power supply management techniques, a circuit breakeroperation is always guaranteed when attempted and alarms are raised over thetelemetry when auxiliary power is lost.

A communications radio or special modem can be mounted within the control andcommunications cubicle. A V23 FSK modem is included as standard equipment.

Communications CubicleOverview

Pole Top Control & Communications Cubicle

Control and Protection Module (CAPM) Circuit Board

4 Nu-Lec IndustriesW-Series

The Nu-Lec Industries automatic circuit reclosers provide manyoutstanding advantages to the user. New and innovative featureshave been made possible by the intimate way the pole mountedcircuit breaker and communications cubicle work together. Theblock diagram below shows how the two items are interfaced. Theheart of the unit is the Control and Protection Module (CAPM) andthe intelligent Operator Control Panel.HV Line signals are connected into the electronics module by direct connection tothe analogue front end. A special extended range current transformer provides arange from 1 to 6,000A for measurement and protection. An embedded voltagescreen accurately image the primary voltage value and phase relationship, allowingmeasurement of voltage, current, power factor and frequency in the electronicmodule.

Each recloser is provided with an Operator Control Panel which has a four lineliquid crystal display with back lighting for night operation. From here a user canaccess and program the many measurement and protection features available.

Three levels of user interface with the Operator Control Panel are provided asfollows:

1. Operator LevelThis allows basic operation Trip, Close and display of settings, such as:� Protection settings and fault history� Line measurements and historical data� Recloser functions such as:

Remote control ON/OFFLocal control ON/OFFAuto reclose mode ON/OFFClose/Trip ENABLE/ISOLATE

� Alarms/Status such as:Auxiliary supply failBattery supply failLockout

2. Technician LevelThis level is password protected at the user’s discretion in the “Engineer Level” andallows the setting of all protection related parameters.

3. Engineer LevelThis is accessible through a laptop or desktop computer and allows advancedcustomisation of the operator panel, setting of passwords, and all the Operator andTechnician Level functions.

Telemetry InterfaceThe Nu-Lec Industries automatic circuit recloser can be interfaced to your SCADAsystem either through its built-in V23 modem and a radio, or its RS232 port and amodem of your choice. A variable voltage uninterruptable power supply is includedfor the radio or modem, which can be mounted inside the communications cubicle.Almost all telemetry protocols can be supported. DNP3 and IEC870 are two of theavailable protocols.

Computer InterfaceThe Windows Switchgear Operating System (WSOS) is an advanced personalcomputer based software package to allow off-line and on-line programming,monitoring and control of a recloser via the RS232 port. This is available as anoption to the basic Nu-Lec Industries recloser.

Remote ControlAs an additional option, Nu-Lec Industries offers the WSOS multiple connect PCbased software package to individually remote control and monitor a population offield mounted reclosers and/or load break switches. The system communicates withthe control cubicle by either cable, fibre optic, telephone line or radio. WSOSprovides additional features such as alarm and event handling, dial in and dial outfacilities and report generation.

Block Diagram & Features

Operator Control Panel

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Recloser Block Diagram

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XILI

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YSW

ITC

HES

VAC

UU

MIN

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RU

PTER

TRIP

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AC

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MEM

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SINGLE PHASE HV LINE CVTCT

CIRCUIT BREAKER

OPTIONALEXTERNAL

CVT

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CA

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DIO

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DEM

REM

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I/O C

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PAN

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DIG

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VER

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DIGITAL INTERFACE

MICROPROCESSOR

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DEM SERIAL

INTERFACE

AC

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SUPP

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APA

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TRIP

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PAC

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WSOSOPERATOR

PC

AUXPOWERSUPPLY

CONTROL CUBICLE

CONTROL &PROTECTION

MODULE (CAPM)

SPI

V23

FSK

RS2

32

RS2

32

CONTROL CUBICLE ENTRY MODULE

Nu -Lec Industries W-Series

--------- OOPPEERRAATTOORR SSEETTTTIINNGGSS --------SSLLooccaall CCoonnttrrooll OONNAAuuttoo RReecclloossee OOFFFF CCoolldd LLooaadd IIDDLLEESSiinnggllee SShhoott AAccttiivvee PPrroott ‘‘AA’’ AAccttiivvee

6

General ProtectionFeatures

Reclose times are individually selectable. The operating sequence is defined by:O - 1st rt - CO - 2nd rt - CO - 3rd rt - CO where rt = reclose time.

Operating Sequence

Reclose Times

Sequence Reset Time

Trips to Lockout

Instantaneous Protection

Definite Time Protection

Sequence Coordination

1st reclose time: 0.5 - 180 sec2nd reclose time: 2.0 - 180 sec3rd reclose time: 2.0 - 180 secTiming resolution: 0.1 sec

Sequence reset time: 5 - 180 secTiming resolution: 1 sec

Overcurrent and fault trips to lockout are selectable between 1 and 4.

Instantaneous Protection works by tripping the recloser if the line current exceedsthe Instantaneous Multiplier x Setting Current.

Multiplier Range: 1 - 30Resolution of setting: 0.1Max effective setting: 12.5kA

Definite Time is available on phase and earth protection as an alternative toInverse Time protection. It works by tripping the recloser at a fixed time afterpickup.

Setting current range: 3 - 1260ADefinite time resolution: 0.1 secDefinite time range: 0.5 to 100 secSetting current resolution: 1A

Sequence Coordination allows a recloser to keep its trip sequence in step withanother recloser downstream.

Fast Trip Input ModuleThis module is available as an accessory. It provides an optically isolated input tounconditionally trip the recloser within 60ms of activation (including debounce andbreaker operating time). This module is purchased as an additional hardware item.For further details or application suitability, refer to Nu-Lec Industries.

Inverse Time CurvesThe CAPM offers a total of 48 user selectable inverse time protection curves.These are:

Three IEC255 curves: Standard Inverse,Very Inverse andExtremely Inverse.

Three IEEE C37.112 Inverse Time curves: Moderately Inverse,Very Inverse andExtremely Inverse.

42 Non Standard Inverse Time Curves: Refer to the TechnicalManual for a full listing.

User Defined CurvesUp to five User Defined Curves (UDC) may be selected at the control panel in thesame manner as the above curves. The UDC module in WSOS is used toconfigure the UDCs.

Nu-Lec IndustriesW-Series

7

Advanced ProtectionFeatures

Live Load Blocking

Inrush Restraint

Cold Load Pickup

Multiple Protection Groups

Automatic Protection Group Selection

Live Load Blocking prevents a recloser from closing if any of the load side terminalsare live.

Live Load Threshold Voltage Range: 2 - 24kV

Inrush Restraint raises the phase and earth threshold currents for a short period oftime to allow for short duration inrush currents when closing onto a load.

Multiplier Range: 1 - 30Multiplier Resolution: 0.1Time Range: 0.05 - 30 secTime resolution: 0.05 sec

Cold Load Pickup allows for a loss of diversity when a load has been withoutsupply for a period of time.

Multiplier Range: 1 - 5Multiplier Resolution: 0.1Time Constant Range: 1 - 480 minTime constant resolution: 1 min

The CAPM supports up to 10 Protection Groups, each of which can be configuredwith completely separate protection characteristics with different inverse timecurves and setting currents. The number of protection groups available to theoperator can be configured using the Windows Switchgear Operating Systemthereby restricting or enabling access to protection settings as required.

Range of protection groups: A - J

Automatic Protection Group Selection is used to change the protectioncharacteristics depending on the direction of power flow. This allows the recloser tobe correctly graded with devices downstream regardless of the power flowdirection.

Range of protection group pairs: A&B, C&D, E&F, G&H, I&J

Under / Over Frequency ProtectionThis is an additional protection feature available on request.

Frequency tripping range: 45 - 65 HzFrequency calculation: Once per cycle over

a two cycle periodNumber of under/over frequency 2 - 1000cycles before tripping:Accuracy: ±0.05Hz


8

Measurement Features

Current

Real Power (signed or unsigned)

Power Factor

RMS current is measured on the single phase (accuracy ±2.5%, reading 2 - 800A)

Determined by multiplying V x I in real time and averaging over two seconds(accuracy ±5% of reading, within limits of V and I above).

Determined from line voltage and line current phase relationship and the previouslycalculated real power (accuracy ±5% of reading, within limits of V and I above).

True RMS voltage is measured on the default source side (I-Side). A userconfigured threshold indicates live terminal (accuracy ±2.5%). Load sidemeasurement is available if the optional external CVT is installed.

Voltage

Event HistoryMinimum number of typical events 3,000 eventsstored in the event history:

Default Historical MeasurementsPower flow is integrated over 5, 15, 30, or 60 minute intervals (kWH) and recordedfor 2 months at the default setting. This can be viewed on the Operator ControlPanel, computer, or compatible SCADA system. Additionally, data can be uploadedinto a portable computer or a compatible SCADA system.

Configurable Historical MeasurementsAverage Demand Profiles may be configured using WSOS. Customisedconfiguration enables the user to specify only the parameters that are requirednegating unnecessary information capture.


Pole Mounting Details

Note:1. Details given in illustrations on this page are

subject to change without notice. For fulldetails see the separate Technical Manual.

2. Earthing connections are not shown and areto be in accordance with the TechnicalManual.

Pole mounted W-Series single phase recloser and control cubicle

Front View of Mounting

Bracket bolted to polerequires 2 x 20 mmBolts for pole mount-ing. (not supplied)

ControlCable

Control andCommunicationsCubicle

Optional Radio Aerial(positioned by cus-tomer)

9

X-Side

I-Side

Surge Arrester

Surge Arrester


400-30TP stud connector 400-15TP stud connector

Cable connection optionsConnections are made to the bare recloser terminals using crimp lugs, parallelgroove clamps or stud connectors. This arrangement is suitable for connection intoan insulated or bare conductor system, as appropriate.

Rated Maximum Voltage . . . . . . . . . . . . . . . . . . . . . . .24kVRated Nominal Voltage . . . . . . . . . . . . . . . . . . . . . . . .21kV (phase to ground)Rated Continuous Current . . . . . . . . . . . . . . . . . . . . . .400AFault Make Capacity (RMS) . . . . . . . . . . . . . . . . . . . . .6kAFault Make Capacity (Peak) . . . . . . . . . . . . . . . . . . . . .15kAFault Break Capacity . . . . . . . . . . . . . . . . . . . . . . . . . .6kAPower Operating Time (Close/Open) . . . . . . . . . . . . . .0.1 / 0.05sMechanical Operations . . . . . . . . . . . . . . . . . . . . . . . .10000Rated Full Load Operations . . . . . . . . . . . . . . . . . . . . .10000Short Time Current (1 sec RMS) . . . . . . . . . . . . . . . . .6kAShort Time Current (3 sec RMS) . . . . . . . . . . . . . . . . .6kA

Specifications

Ratings

Breaking Capacity

Basic Insulation Level (Lightning Impulse Withstand Voltage)

One Minute Power Frequency Withstand Voltage

Environmental

1 Temperature rating dependent on control cubicle model purchased with equipment.2 For altitudes above 1000m derate recloser in accordance with ANSI C37.60

10

Mainly Active (0.7pf) . . . . . . . . . . . . . . . . . . . . . . . . . .400ACable Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25ALine Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5ATransformer Magnetising Current . . . . . . . . . . . . . . . . .22A

Phase to Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125kVAcross Interrupter . . . . . . . . . . . . . . . . . . . . . . . . . . . .125kV

Phase to Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60kVAcross Interrupter . . . . . . . . . . . . . . . . . . . . . . . . . . . .60kV

Ambient Temperature (1) . . . . . . . . . . . . . . . . . . . . . . . .-30 - +50°CRadiation (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.1kW/m²Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 to 100%Altitude (Max) (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3000m

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62kgControl Cubicle and sundry items . . . . . . . . . . . . . . . . .130kg

Net Weight

Crate DimensionsDimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .W=1150mm D=1150mm H=570mm


Ambient TemperatureTropical = -10 to 50°CModerate = -15 to 40°CTemperate = -30 to 40°C

Auxiliary Supply Voltage110 = 110V AC240 = 240V ACInt = Integral supplyInt/110 = Integral and 110V ACInt/240 = Integral and 240V ACDual = 110 & 240V AC

Control Cable Length4 = 4m 7 = 7m11 = 11m

PTCC - - -

Common control cubicle:Specify the temperaturerange, auxiliary supplyvoltage and control cablelength for the Pole TopControl Cubicle (PTCC).Communication protocoland radio/modem cabletype must be separatelyspecified at time of order.

11

Ordering Information


1. Model:W27 is the current model

W-Series

24

2. Insulation medium:Solid dielectric single phaseautomatic circuit recloser

3. System Voltage:24 = 24kV

4. Current Capacity6 = 6kA

5. Insulation Level:125 = 125kV

6. Terminal Rating:400-15TP = 400A stud

connector400-30TP = 400A stud

connector400-BT = 400A Bare

Terminal (BT)

The W-Series ACR ordering information comprises two part numbers. The circuit breaker part number includes aModel Identifier and fields describing the Insulation Type, System Voltage, Current Capacity, Insulation Level andTerminal Rating. The Pole Top Control Cubicle (PTCC) comprises temperature range, cable length and auxilliarysupply. The part numbers do not include measurement units and is constructed using only one option per field inthe selection chart below. A part number example is shown below:

Nu-Lec-W27-ACR-Solid-24-6-125-400-BT and Nu-Lec-PTCC-Moderate-240-7

Nu-Lec - W27 ACR-Solid - 24- - 6 - 125 - 6

125

ACR-Solid

6

Fielddescriptions

Nu-Lec-PTCC - - -

and

W27

400-15TP

400-30TP

400-BT

Copyright 2001 Nu-Lec Industries Pty Ltd. No responsibility for loss incurred by any person acting or refraining from actionin reliance upon any material in this brochure can be accepted by Nu-Lec Industries Pty Ltd.

CORPORATE OFFICE & FACTORY

35-37 South StreetLytton, 4178Queensland

AustraliaTelephone (07) 3249 5444

Intl +61 7 3249 5444Facsimile (07) 3249 5888

Intl +61 7 3249 5888E-mail: [email protected]

http://www.nulec.com.au

UK OFFICE

Unit 9, Kings MeadowFerry Hinksey Road

Oxford OX2 0DPUnited Kingdom

Telephone (01865) 209 999Intl +44 1865 209 999

Facsimile (01865) 209 900Intl +44 1865 209 900

E-mail: [email protected]://www.nulec.co.uk

USA OFFICE

1252 Old Alpharetta RoadAlpharetta, Georgia

30005-3986United States of America

Telephone (770) 521 2000Intl +1770 521 2000

Facsimile (770) 521 2100Intl +1770 521 2100

E-mail: [email protected]://www.nulec.com

SOUTH AFRICA OFFICE

Cnr. Bekker & Montrose Rds,Midrand, South Africa

Postal address: Private Bag X139,Halfway House, 1685

Telephone (011) 254 6400Intl +27 11 254 6400

Facsimile (011) 254 6925Intl +27 11 254 6925

E-mail: [email protected]://www.nulec.co.za

Distributor:

Brochure Part Number: N00-596

Documents

W-Series solid dielectric single phase recloser