ABB RET615 Manuel utilisateur

Relion® 615 series

Transformer Protection and Control

RET615

Product Guide

Contents

1. Description...........................................................3

2. Standard configurations.......................................3

3. Protections functions...........................................6

4. Application...........................................................9

5. Supported ABB solutions...................................11

6. Control................................................................13

7. Measurement.....................................................13

8. Disturbance recorder..........................................13

9. Event log.............................................................13

10. Recorded data...................................................13

11. Circuit-breaker monitoring................................14

12. Trip-circuit supervision......................................14

13. Self-supervision.................................................14

14. Access control...................................................14

15. Inputs and outputs............................................14

16. Communication.................................................15

17. Technical data...................................................17

18. Display options..................................................38

19. Mounting methods............................................39

20. IED case and IED plug-in unit...........................39

21. Selection and ordering data..............................40

22. Accessories and ordering data.........................43

23. Tools..................................................................44

24. Terminal diagrams.............................................45

25. References........................................................47

26. Functions, codes and symbols.........................47

27. Document revision history.................................50

Disclaimer

The information in this document is subject to change without notice and should not be construed as a commitment by ABB Oy. ABB Oy assumes

no responsibility for any errors that may appear in this document.

Trademarks

ABB and Relion are registered trademarks of ABB Group. All other brand or product names mentioned in this document may be trademarks or

registered trademarks of their respective holders.

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

2 ABB

1. Description

RET615 is a dedicated transformer protection

and control IED (intelligent electronic device)

for power transformers, unit and step-up

transformers including power generator-

transformer blocks in utility and industry

power distribution systems. RET615 is a

member of ABB’s Relion®product family and

part of its 615 protection and control product

series. The 615 series IEDs are characterized

by their compactness and withdrawable

design.

Re-engineered from the ground up, the 615

series has been designed to unleash the full

potential of the IEC 61850 standard for

communication and interoperability between

substation automation devices. Once the

standard configuration IED has been given

the application-specific settings, it can

directly be put into service.

The 615 series IEDs support a range of

communication protocols including IEC

61850 with GOOSE messaging, IEC

60870-5-103, Modbus®and DNP3.

2. Standard

configurations

The transformer protection and control IED

RET615 is available with four alternative

standard configurations.

Table 1. Standard configurations

Description Std.conf.

Three-phase transformer differential protection for two-winding transformers,

numerical restricted earth-fault protection for the high-voltage (HV) side A

Three-phase transformer differential protection for two-winding transformers,

numerical restricted earth-fault protection for the low-voltage (LV) side B

Three-phase transformer differential protection for two-winding transformers,

high-impedance based restricted earth-fault protection for the high-voltage

(HV) side

Three-phase transformer differential protection for two-winding transformers,

high-impedance based restricted earth-fault protection for the low-voltage (LV)

side

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

Revision: B

ABB 3

Table 2. Supported functions

Functionality A B C D

Protection1)

Stabilized and instantaneous differential protection for two-

winding transformers ●●●●

Numerical stabilized low impedance restricted earth-fault

protection ● ● - -

High impedance based restricted earth-fault protection - - ● ●

Master Trip, instance 1 ●●●●

Master Trip, instance 2 ●●●●

HV-side protection

Three-phase non-directional overcurrent protection, low

stage, instance 1 ●●●●

Three-phase non-directional overcurrent protection, high

stage, instance 1 ●●●●

Three-phase non-directional overcurrent protection,

instantaneous stage, instance 1 ●●●●

Non-directional earth-fault protection, low stage, instance 1 ●-●-

Non-directional earth-fault protection, high stage, instance 1 ●-●-

Negative-sequence overcurrent protection, instance 1 ●●●●

Three-phase thermal overload protection for power

transformers, two time constants ●●●●

Circuit breaker failure protection ●●●●

LV-side protection

Three-phase non-directional overcurrent protection, low

stage, instance 2 ●●●●

Three-phase non-directional overcurrent protection, high

stage, instance 2 ●●●●

Three-phase non-directional overcurrent protection,

instantaneous stage, instance 2 ●●●●

Non-directional earth-fault protection, low stage, instance 2 - ●-●

Non-directional earth-fault protection, high stage, instance 2 - ●-●

Negative-sequence overcurrent protection, instance 2 ●●●●

Arc protection, instance 1 o o o o

Arc protection, instance 2 o o o o

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

4 ABB

Table 2. Supported functions, continued

Functionality A B C D

Arc protection, instance 3 o o o o

Control

Circuit-breaker control with interlocking ●●●●

Disconnector position indication, instance 1 ●●●●

Disconnector position indication, instance 2 ●●●●

Disconnector position indication, instance 3 ●●●●

Earthing switch indication ●●●●

Tap changer position indication ●●●●

Condition monitoring

Circuit-breaker condition monitoring ●●●●

Trip circuit supervision, instance 1 ●●●●

Trip circuit supervision, instance 2 ●●●●

Measurement

Disturbance recorder ●●●●

Three-phase current measurement, instance 1 (HV side) ●●●●

Three-phase current measurement, instance 2 (LV side) ●●●●

Sequence current measurement (HV side) ●●●●

Residual current measurement, instance 1 (HV side) ●-●-

Residual current measurement, instance 2 (LV side) - ●-●

●= included, o = optional at the time of order

1) Note that all directional protection functions can also be used in non-directional mode.

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

ABB 5

3. Protections functions

The IED features, three-phase, multi-slope

transformer differential protection with an

instantaneous stage and a stabilized (biased)

stage to provide fast and selective protection

for phase-to-phase, winding interturn and

bushing flash-over faults. Besides second

harmonic restraint an advanced waveform-

based blocking algorithm ensures stability at

transformer energization and a fifth harmonic

restraint function ensures good protection

stability at moderate overexcitation of power

transformers. Sensitive restricted earth-fault

protection (REF) completes the overall

differential protection to detect even single

phase-to-earth faults close to the neutral

earthing point of the transformer. Either the

conventional high-impedance scheme or a

numerical low-impedance scheme can be

selected for protection of the windings. When

the low-impedance REF protection is used

neither stabilizing resistors nor varistors are

needed and as a further benefit the

transforming ratio of the neutral earthing CTs

can differ from those of the phase current

transformers. Due to its unit protection

character and absolute selectivity REF does

not need time grading with other protection

schemes, and therefore high-speed fault

clearance can be achieved.

The IED also incorporates a thermal overload

protection function, which supervises the

thermal stress of the transformer windings to

prevent an accelerated aging of the winding's

insulation. Multiple stages of short-circuit,

phase-overcurrent, negative-phase-sequence

and earth-fault back-up protection are

separately available for both windings. Earth-

fault protection based on the measured or

calculated residual overvoltage is also

available. Finally, the IED also offers circuit-

breaker failure protection.

Enhanced with optional hardware and

software, the IED also features three light

detection channels for arc fault protection of

the circuit breaker, busbar and cable

compartment of metal-enclosed indoor

switchgear.

The arc-fault protection sensor interface is

available on the optional communication

module. Fast tripping increases personal

safety and limits material damage within the

switchgear in an arc fault situation.

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

6 ABB

GUID-987FF881-286F-44E3-A24B-4A3C2A137C26 V1 EN

Figure 1. Protection function overview of standard configuration A

GUID-E197B2BA-0E91-413E-9462-7E2FEE2D320F V1 EN

Figure 2. Protection function overview of standard configuration B

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

ABB 7

GUID-A68F1E1E-49FA-4B6C-9F18-1099F998F9EE V1 EN

Figure 3. Protection function overview of standard configuration C

GUID-B23D25EF-1130-4D27-8E46-1F3ADD5851EB V1 EN

Figure 4. Protection function overview of standard configuration D

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

8 ABB

4. Application

RET615 provides main protection for two-

winding power transformers and power

generator-transformer blocks. As of now,

there are four standard configurations

offering comprehensive protection functions

for detection and elimination of operational

disturbance conditions and power

transformer faults.

The standard configurations A and C are

intended for power transformers with earthed

HV side neutrals. The A configuration

features low impedance REF protection while

the C configuration offers high impedance

REF protection. The B and D configurations

fit transformers with a solidly earthed LV side

neutral or their LV side neutral earthed over a

resistor. The B and D configurations fit also

applications including a separate earthing

transformer located within the area of

protection. The A and B configurations also

suit applications, where the turns ratio of the

CT of the neutral earthing circuit differs from

turns ratio of the line CTs. The C and D

configurations require that the turns ratios of

the CTs are equal.

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

ABB 9

GUID-AB31C909-F38E-4885-AFEE-E2EEE3675263 V1 EN

Figure 5. Main protection of a Yyn(d) connected power transformer and control of the HV side

circuit breaker using a RET615 with the standard configuration D. Restricted E/F

protection with a high impedance scheme is applied on the transformer MV side. A

REF615 with the standard configuration C is used as redundant back-up protection

on the HV side. In addition, a REF615 with the standard configuration F is used on

the MV side to provide, besides O/C and E/F back-up protection, busbar overvoltage

and undervoltage protection. Further, the REF615 with the standard configuration F

enables local/remote control of the circuit breaker on the MV side.

Transformer Protection and Control 1MRS756891 B

RET615

Product version: 2.0 Issued: 01.10.2009

10 ABB

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