87T Relay-C&S-CSEZenT

Issue Date: 25:11:09 Revision No :1 Date: 02:03:10

CSEZenT: Advance Transformer Protection & Monitoring Solution


INTRODUCTION CSEZen series offers a Multifunctional comprehensive smart protection solution for Feeder, Generator, Motor & Transformer segment. CSEZen Family of protective relays are advance numeric relays that provides multi protection and monitoring with reliable and fast protection solution in a single unit. In the same family of CSEZen series, the CSEZenTxx is an advance transformer protection solution which provides fast, sensitive and secure protection on transformer internal & external faults. CSEZenTxx also provides a automation solution of power control. It compliance with IEC60870-5-103, IEC61850, Modbus protocol for high integration of protection & control. CSEZenTxx offers following model based features to cover the wide range of user. � Measurement, Protection & Metering � Communication � Disturbance Record � Event Record � Fault Record � DI/DO/LED Matrix Programmability

APPLICATION CSEZenT differential protections are used as the main protection and control units for two winding power transformers, for both internal faults and faults in the influence area of current transformers. CSEZenT units require no intermediate transformers to adjust CT Ratio and vector group correction, as these adjustments are made by the relay itself in software.

CSEZenT/G Model CSEZenT is available in below models CSEZenT260: For 2-winding transformer protection

CSEZenG380: For Generator Differential Protection


Hardware

� 7 Current and one voltage analogue inputs � Max 16 Digital inputs � Max 16 Digital outputs � 10 programmable led � LAN-RJ45 /RS485 /USB/IRIG-B ports for Communication

Functions

� Lockout Relay � Open-Close Breaker Command � Trip circuit supervision (74TC)

FUNCTIONAL DIAGRAM

Protection functions

� Three-phase differential protection (87) with harmonic restrain

� Instantaneous differential (87) � Restricted earth protection (87G) � Three phase time overcurrent

protection in each winding (51) � Three phase instantaneous

protection in each winding (50) � Ground time overcurrent (51G) � Ground instantaneous overcurrent

(50G) � Over-under frequency(81 U/O) � Over-under voltage (59/27) � Over-excitation (24 V/Hz) � Current unbalance (46) � Thermal image (49) � Breaker failure (50BF) in each

winding � Neutral overcurrent (50N/51N) in

each winding


PROTECTION FUNCTIONS

The CSEZenT is a numerical multifunctional relay ideally suited for the protection of any two winding transformer against two phase internal faults, inter-turn faults and ground faults as well as overcurrent protection for both phase faults and earth faults separately for each transformer winding.

Percent differential protection (87) CSEZenT unit has dual slope characteristic for differential protection with programmable percentage slope settings, adjustable slope breakpoints, and adjustable additional time delay. This unit provides programmable CT ratio correction factor for primary and secondary side of transformer and CT connection configurations through programmable vector groups. The differential unit operation characteristic is the following one:

Harmonic restraint A second and fifth harmonic restraint current is calculated for each phase and extracted using DFTs. The magnitude of this current is used to discriminate between faults and inrush conditions, restraining differential function during inrush caused by energization and overexcitation. If blocking on harmonic setting is enable then relay should block all the tripping operation if 2

nd/5

th harmonic

are higher than the set values.

Instantaneous differential protection The trip operation takes place once the programmed time since the differential current exceeds the programmed setting has passed. It does not have harmonic restraint.

Restricted earth protection (87G) Earth protection (50G, 51G) will be available either to winding 1 or winding 2 which is selectable. This function is applicable when a winding is an earthed star and has a measurement CT in the earth wired.If the difference between the residual and neutral current (algebraic sum of phase current) equals Iref exceeds the calculated value according to the tripping characteristic then a trip signal is given. The restricted earth unit operation characteristic is the following one:

Phase Overcurrent (3x50/51) This unit gives backup protection for transformer external faults. If these external faults are not cleared by the primary protections, this overcurrent unit will actuate, otherwise the transformer will be seriously damaged due to overloads. Each winding features two levels.

Ground Overcurrent (50G/51G) This is an overcurrent function used on the current measured at the grounding of a power transformer, being its function to detect faults to earth. Each winding features two levels.


Neutral Overcurrent (50N/51N) This is an overcurrent function applied to the vectorial sum of phase currents, being its function to detect faults to earth. Each winding features two levels.

Current unbalance (46) This function protects the installation against current unbalances resulting from anomalies in the power system or unbalanced loads.

Thermal Image (49) The thermal image unit protects the transformer against damage resulting from heating up during overloads. This unit is based on the calculation of winding temperature via thermal image.

Breaker failure protection (50BF) It verifies the breaker correct actuation clearing a fault, causing, otherwise, the trip of the necessary breakers to clear that fault.

Frequency protection (81O/U) This unit features 2 frequency steps that may be independently set as maximum frequency or minimum frequency units, allowing load shedding.

Over-under voltage protection (59/27) This unit protects transformers against overvoltages and undervoltages, giving a trip command when the voltage exceeds or drops below a set level for a set time.

Overexcitation protection (24) The overexcitation unit prevents transformers from working at a greater flow density than that for which they were designed. Avoiding heatings and consequent damage in the transformer due to overexcitation. This unit is based on V/Hz overexcitation detection method with two independent levels.

AUTOMATION Lockout relay (86) Relays programme with this function will act when the differential unit acts (instantaneous or percentage type) so that they can be used as a locking device for breaker close circuits.

Protection function locking Each protection function may be locked via a digital input.

MONITORING FUNCTION Trip circuit supervision (74TC) This feature detects any anomalies in the circuit with the switch open or close. It detects trip circuit supply failure of circuit breaker, tripping mechanism failure like circuit breakage contact degeneration in wires, contacts and coils.


DATA ACQUISITION FUNCTION Measurements

� L1,L2,L3 phase current measurements in primary winding

� L1,L2,L3 phase current measurements in secondary winding

� L1,L2,L3 differential current measurements � Earth current measurement � Restricted earth current measurement � Current Maxi-meter � Voltage � Frequency

Disturbance Record The CSEZenT/G relay has an oscillograph data recorder with the following characteristics:

� Oscilloscopic recording can trigger on Pickup or on trip or by DI. It is programmable.

� Each record comprises the samples from 8 analog signals and the status of 16 digital inputs and 16 digital outputs.

� 30 samples per cycle � It is saved a maximum of 1500 cycles, and the

number of cycles per record is programmable (for example: if 50 cycles are selected, there will be there will be 30 records of 50 cycles).

� The prefault and postfault cycles are programmable

� Records in non volatile memory � The disturbances are collected and exported to

PC using USB interface. The data is graphically displayed and can be taken on printer.


Fault Record CSEZenT/G records last 50 faults in its non volatile memory with it’s time stamp. Each record has the following information:

� Magnitude of primary phase current’s,

secondary phase current’s � Magnitude of Restricted earth Fault current’s &

earth current � Magnitude of differential phase current’s,

second & fifth harmonic of differential phase current’s

� Date and time of fault � Origin of fault (over current, differential, etc.)

The user can view fault records either via the front USB interface software or remotely via the RS 485 communication.

Event Record The unit stores in non volatile memory the last 200 events. When the available memory space is exhausted, the new fault automatically overwrites the oldest Fault. Which can be retrieved from a PC, with the following data:

� Date and time of the event � Descriptive text of the event

The user can view event records via the front USB interface software


MAN-MACHINE INTERFACES

CSEZenT460 offers a variety of front user interfaces, including:

Human-Machine Interface (HMI) It comprises of Alphanumeric display and 9 push buttons for setting and other operations for local access:

� Five push switches for set values of normal tripping characteristics including a RESET push switch. � 2 push switches for the tripping of relay assigned to F1Key &F2Key � 2 push switches for the tripping of relay assigned to Circuit breaker open & Circuit breaker close. � 10 Programmable LEDs for pickup or tripping on fault’s & events.


Communication: Local and remote The unit has:

� 1 front USB port for direct connection to a PC � 1 rear RS485 communication port

Rear port’s programmable communication protocols The protocol for the rear port is programmable. The user can choose either MODBUS or IEC 870-5-103

PC interface All the group’s setting, Fault, Event & Disturbance record is available on USB interface with CSE LIVELINK with saving & printing option. This unit also has Front-end Live Link simulation support for testing of relay even without any three phase injection source.

USB Pen-Drive interface for data storage device The CSEZenT has front USB port for transferring all the data like fault history, event history, editable parameter’s setting of both group’s (group1,group2) from CSEZenT460 relay to data storage device & also to transfer editable parameter’s setting of both group’s from storage device to CSEZenT460 relay.

The CSEZenT460 includes an RS485 communication on terminal A33 and A34 .This communication is available for “MODBUS™” protocols. CSEZenT460 relay can transmit to the monitoring or SCADA system, settings, measurements and last fault. A communication failure dose not affects the protection functions of CSEZenT460 relay.


SETTING RANGES

Over Current Protection:

Setting Parameter Minimum Value Maximum Value Unit Step Tolerances

Blocking of Current Protection (BLOCK)

NO YES

Phase Charactristics (CHAR)

DEFT EINV,VINV, LINV, NINV1.3, NINV3.0

OverLoad Current Setting(Ipkup)

0.2 4 xIn 0.05 ± 5 % from set value

Overload inverse timing(ti)

0.01 1.5 - 0.005 ± 3 % ± 20 ms

OverLoad Definite timing(t)

0.1 150 Second 0.01

+ 5% +20msec for VINV , NINV3.0/1.3 + 7.5% + 20msec for EINV , NINV0.6 Accuracy as per IEC-255-3 within I> (2 x IN to 40 x IN)

Short circuit Protection:

Restricted earth protection:

Setting Parameter Minimun Value Maximun Value Unit Step

Restricted Earth Fault Protection(Only star side will be protected)

Blocking of REF Protection(BLOCK) NO YES

Earth CT correction factor(ECTcorr) 0.1 4 0.01

Min. REF Pickup (m0_REF) 0.04 1 - 0.02

REF First Slope (m1REF) 10 100 % 1

Start point of slope (k1_REF) 0.04 3 - 0.02

Added Delay 0 60 sec 0.01

Setting Parameter Minimum

Value Maximum

Value Unit Step Tolerances

Blocking of Short Circuit Current Protection (BLOCK)

NO YES

Short Circuit Current Setting(Ipkup)


Short Circuit defininte timing(t)

0.02 20 Second 0.01 ± 5 % ± 20 ms


Earth OverCurrent Protection:

Setting Parameter Minimun Value Maximun Value Unit Step Tolerances

Earth CT ratio 1 999 1

Blocking of Earth Low Set Current Protection (BLOCK)

NO YES

Phase Characteristics (CHAR)

DEFT EINV,VINV,LINV,

,NINV

Earth Low Set Current Setting (Ie_pkup)

0.05 2.5 xIn 0.05 ± 5 % from set value

Earth Low Set inverse timing(ti)

0.01 1.5 Second 0.005 ± 3 % ± 20 ms

Earth Low Set Definite timing(t)

0.03 150 Second 0.01

+ 5% +20msec for VINV,NINV3.0/1.3 + 7.5% +20msec for EINV , NINV0.6 Accuracy as per IEC-255-3 within I> (2 x IE to 40 x IE)

Blocking of Earth HiSet Current Protection(BLOCK)

NO YES

Earth HiSet Current Setting(Ie_pkup)


Earth HiSet definite timing(t)

0.02 20 Second 0.01 ± 5 % ± 20 ms

Differential Protection: Percentage Differential Protection

Blocking of Differential Protection(BLOCK) NO YES

Vector Group Yd1

Yd3/Yd5/Yd7/Yd9/Yd11/Dy1/Dy3/Dy5/Dy7/Dy9/Dy11/YY0/DD0/YY2/DD2/YY4/DD4/YY6/DD6/YY8/DD8/YY10/DD10

Primary CT correction factor(PriCTcorr) 0.3 1.5 0.01

Secondary CT correction factor(SecCTcorr) 0.3 1.5 0.01


Min. Pickup Current (m0) 0.04 1 amp 0.02

1st Slope (m1) 10 100 % 1

2nd Slope (m2) 10 100 % 1

Start point of 1st slope (k1) 0.04 2 amp 0.02

Start point of 2nd slope (k2) 1 10 amp 0.1

Instantaneous Transformer Differential Protection

Blocking of Differential Protection(BLOCK) NO YES


Hiset setting(HiSet) 5 15 amp 1

Differential Protection blocking on Harmonic

Protection Blocking on harmonic(PDIFF BLOCK on H) NO YES

Second harmonic blocking limit(2ndH) 20 50 % 5

Fifth harmonic blocking limit(5thH) 20 50 % 5


Trip circuit supervision (74TC):

Setting Parameter Minimum Value Maximum Value Unit Step

Trip Circuit SuperVision Blocking(BLOCK) NO YES

TCS Timing(td) 0.03 2 Second 0.01

Rear port communication setting:

Relay setting: These are the setting’s common for all the protections –

Setting Parameter Minimum Value Maximum Value Unit Step

Common Setting

Phase CT Ratio 1 999 1

Earth CT Ratio 1 999 1

Voltage PT Ratio 1 999 1

Nominal frequency 50 60 Hz

TECHNICAL DATA Measuring Input Rated data : Rated current IN

Rated frequency FN 1A or 5A 50Hz/60Hz

Power consumption in current circuit : At IN = 1A At IN = 5A

0.2 VA 0.1 VA

Thermal withstand capability in current circuit

: dynamic current withstand (half-wave) for 1 s for 10 s continuously

250 x IN

100 x IN 30 x IN 4 x IN

Rated data : Normal Voltage UN 100V,230 V,400V

Thermal withstand in voltage circuit : continuously 1.5XUN

Measurement accuracy

Quantity Range Frequency

Range Accuracy

Current 1.0-20xIn 50-60Hz Less then ± 2 %

20-40xIn 50-60Hz Less then ± 2 %

RS485 Communication

Protocol : MODBUS RTU

Baud rate selection : 2400/4800/9600/19200 baud

Parity selection : Even/Odd/None

Stop Bit : 1 bit

Data Bit : 8 bit data

Remote Address : To be specified in the “Edit” menu of the relay(1 to 32)


Auxiliary Supply Rated auxiliary voltage UH : Universal 80 VAC to 300 VAC

100 VDC to 270 VDC

Rated supply for digital input : Normal Voltage UN 100VDC/AC

Power consumption : Quiescent approx. 3W Operating appx 6W

Common Data Dropout ratio : > 97 %

Returning time : 30 ms

Time lag error class index E : ± 10 ms

Minimum operating time : 30 ms

Transient overreach at instantaneous operation

: ≤5 %

Type Test Design standard : VDE 04335, part 303, IEC 255-4, BS 142

Specified ambient service Temp. range For storage For operation

: - 40 ºC to + 85 º C - 20 ºC to + 70 ºC

Environmental protection class F as per DIN 40040 and per DIN IEC 68, part 2.3

: Relative humidity 95 % at 40 ºC for 56 days

Isolation test voltage, inputs and outputs between themselves and to the relay frame as per VDE 0435, part 303

: 2.5 kV (eff.) / 50 Hz, I min.

Impulse test voltage, inputs and outputs between themselves and to the relay frame as per VDE IEC 0435, part 303

: 5 kV; 1.2 / 50µs; 0.5.

High frequency interference test voltage, inputs and outputs between themselves and to the relay frame as per DIN IEC 255, part 22-1

: 2.5 kV / 1 MHz

Electrical fast transient (Burst) test as per DIN VDE 0843, part 4

: 4 kV / 2.5 kHz, 15 ms

Radio interference suppression test as per DIN VDE 57 871

: Limit value class B

Electrostatic discharge (ESD) test as per DIN VDE 0843 part 2

: 8 kV

Radiated electromagnetic field test as per VDE 0843 part 2

: 10 V / m


Mechanical Tests Shock : As per DIN IEC 41 B (CO) 38 : class 1

Vibration : As per DIN IEC 41 B (CO) 35 : class 1

Protection-front panel : IP 54

Protection-rear panel : IP 00

Weight : Approx. 1.5 kg

CONNECTION DIAGRAM


DIMENSIONAL DETAILS

Front View

Side View


Top View

Back View


SELECTION TABLE

CSEZen - - - - - - - -

Transformer T

Generator G

MODEL-No

260

380

Auxiliary Supply

18-60 VDC/VAC AX1

86-280 VDC/VAC AX2

DIGITAL INPUTS Voltage Range

Range:18-60 VDC (48V) DV1

Range:86-280 VDC ( 110V) DV2

DIGITAL INPUT

8 -DI D1

16 -DI D2

DIGITAL OUTPUT

8-DO DO1

16-DO DO2

COMMUNICATION PROTOCOL

RS 485 with MODBUS A

RJ 45 with MODBUS B

RS 485 with IEC60870-5-103 C

RJ 45 with IEC 61850 D

TIME SYNCH

IRIG-B I

Continuous improvement of

its products is CS Electric

ltd one of the main

objectives, consequently this

catalogue’s information, can

be modified. To get

completer information,

consult the manual or

contact our sales department

Documents

87T Relay-C&S-CSEZenT