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1MRK 506 067-BEN

Page 1 Issued: August 2001 Changed since: November 2000 Data subject to change without notice

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? Open terminal with extensive configuration possibilities and expandable hardware design to meet specific user requirements

? Full scheme phase-to-phase and phase-toearth distance protection with three to five zones

? Separate phase selector

? Wide range of phase and residual overcurrent protection functions

? Additional protection function library available

? Extensive disturbance report with:

- 10 most recent disturbances recorded

- 40 seconds disturbance recorder

? Wide range of control functionality available

? 18 LEDs for extended indication capabilities

? Versatile local human-machine interface (HMI)

? Simultaneous dual protocol serial communication facilities

? Extensive self-supervision with internal event recorder

? Time synchronization with 1 ms resolution

? Four independent groups of complete setting parameters

? Powerful software `tool-box' for monitoring, evaluation and user configuration

The main purpose of the REL 521 terminal is the protection, control and monitoring of overhead lines and cables in solidly grounded networks. It is suitable for the protection of long heavily loaded lines and multi-circuit

lines, and where the requirement for tripping is one-, two-, and/or three-pole. The terminal may also be used to provide backup protection for power transformers, busbars, etc.

Type tested software and hardware that comply with international standards and ABB?s internal design rules together with extensive self monitoring functionality, ensure high reliability of the complete terminal.

The terminal's closed and partly welded steel case makes it possible to fulfill the stringent EMC requirements.

An extensive library of protection, control and monitoring functions is available. This library of functions, together with the flexible hardware design, allows this terminal to be configured to each user?s own specific requirements. This wide application flexibility makes this product an excellent choice for both new installations and the refurbishment of existing installations.

All serial data communication is via optical connections to ensure immunity against disturbances.

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Page 2

REL 521

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? 3 zones ph-ph and ph-E distance protection with additional phase selection logic; plus - scheme communication logic - current reversal and WEI logic - local acceleration logic

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? 2-step non-directional phase overcurrent protection Step 1: instantaneous Step 2: instantaneous or definite time-delayed

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? 2-step non-directional residual overcurrent protection Step 1: instantaneous Step 2: instantaneous or definite time-delayed

? Dead line detection

6391

? 3-pole tripping logic

75,3

Comm. to remote end

The terminal block diagram shows only included basic functions described in this document.

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Optional functions which can be included are also described in the ordering chapter.

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Page 3

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1) 2) 3)

INTERNAL FAIL

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501.24 501.22

501

12 22

14 24

+ 11 21

EL

13 23

-

X13:TX X13:RX TX RX HMI X15:TX X15:RX

(PSM) 16 (PSM) 15

(MPM)

SPA / IEC-870-5-103 OPTION

HMI

(ADM)

LON OPTION

(PSM)

INTERNAL FAIL

(TRM)

I1 I2 I3 IN I5

U1

U2

U3 (PSM) 17

18

1) COMMUNICATION PORT SPA/

U4

IEC 870-5-103

2) OPTICAL PORT FROM LOCAL

HMI. CONNECTION MADE WITH

U5

A SPECIAL OPTICAL INTERFACE

CABLE.

3) COMMUNICATION PORT LON

4) RESERVED FOR PARALLEL

LINE COMPENSATION OR CT

SUPERVISION

5)RESERVED FOR DIRECTIONAL

EARTH-FAULT FUNCTION

6)RESERVED FOR

REF.VOLTAGE

X11:

1

4 2

5 3

6 8

7 9

10 X12:

1

2

6

7 8

9 10

5 4 3 12

14 16

18

L1 L2 L3

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5) 6)

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Carefully read and follow the set of rules to ensure problem-free order management. Be aware that certain functions can only be ordered in combination with other functions and that some functions require specific hardware selections.

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3ODWIRUP DQG EDVLF IXQFWLRQDOLW\ Basic REx 5xx platform and common functions housed in selected casing

0DQXDOV Order specific Operator's manual (English) Order specific Installation and commissioning manual (English) Order specific Technical reference manual (English)

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Page 4

%LQDU\ ,2 FDSDELOLWLHV Binary I/O resided on power supply module

0HDVXULQJ FDSDELOLWLHV A/D module Transformer module

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3 zones phase-to-phase protection =0 =0 =0 3 zones phase-to-ground protection =0 =0 =0 Phase selection logic 3+6 Scheme communication logic =&20 Current reversal and weak end infeed logic =&$/ Local acceleration logic =&/&

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Instantaneous overcurrent protection ,2& Phase element Residual element

Time delayed overcurrent protection 72& Phase element Residual element

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/RJLF Trip logic 75

Three pole tripping High speed binary output logic +6%2

0RQLWRULQJ Event recorder Analog AC monitor

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REL 521

Quantity:

1MRK 002 494-AC

Default: The terminal is delivered without loaded configuration.

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Page 5

Option: Customer specific configuration

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Energizing quantities for binary inputs on power supply module

24/30 V 48/60 V 110/125 V 220/250 V

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OITP measuring system

5XOH 6HOHFW RQO\ RQH DOWHUQDWLYH ,I VHQVLWLYH HDUWK IDXOW IXQFWLRQDOLW\ VKRXOG EH XVHG VHOHFW IURP QH[W WDEOH Rated measuring input energizing quantities 1A, 110 V

1 A, 220 V 5 A, 110 V 5 A, 220 V

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Rated measuring input energizing quan- 1 A/0.1 A, 110 V tities for sensitive earth fault functions 5 A/0.5 A, 110 V

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/LQH LPSHGDQFH Simplified impedance settings Full scheme distance protection

Additional impedance zone 4 =0 Additional impedance zone 5 =0 Power swing detection 36' Power swing logic 36/ Pole slip protection 363 Radial feeder protection 3$3 Automatic switch onto fault logic 627)

On request

1MRK 000 179-EB 1MRK 000 179-AC 1MRK 000 179-BC 1MRK 000 179-CC

1MRK 002 216-AA

1MRK 000 157-MA 1MRK 000 157-VA 1MRK 000 157-NA 1MRK 000 157-WA

1MRK 000 157-XA 1MRK 000 157-RA

1MRK 001 459-UA 1MRK 001 456-FA 1MRK 001 456-GA 1MRK 001 456-LA 1MRK 001 456-SA 1MRK 001 457-SA 1MRK 001 455-SA 1MRK 001 456-RA

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