ABB Modures LZ92-1 - TESTING WITH EXTERNAL TEST SET

6.6 Testing the distance relay using a test set
Providing the relay is equipped with a test socket XX91, a test set can be
simply connected by means of the test connector YX91. As soon as the test
connector is inserted, a signal is emitted (providing it is appropriately wired
via an auxiliary signalling relay in the unit AV91 respectively AV94) to
indicate that the relay is no longer standing by (V.O in the code of the main
processing unit) .
When it is plugged in the test connector:
- short-circuits the main c.t's
- isolates the relay input from c.t's and p.t's
- interrupts the tripping circuit
- blocks the external signals (driver outputs and signals to ancillaries,
e.g. AV91, AV94 etc.) for starting, tripping and timer (where fitted)
for the duration of testing
- connects the p.t. voltages to the test set (where necessary)
- connects the current and voltage inputs of the relay to the test set.
Facility is provided in the test connector for enabling the signal outputs for
ancillary units if necessary.
A sample test report for testing with a test set can be found in the appendi-
cies.
6.7 Instructions for modifying relay operation
Normally the desired relay operation is defined by the ordering code and
supplied from the works with the corresponding connections etc., already made.
However, should changes become necessary during commissioning, then small
changes (soldered link or value of a resistor on soldering posts) can be done
with the aid of the Table of Features and corresponding PCB drawing in the
appendicies. This work may only be performed by correspondingly qualified
personnel.
The principal
versions
are defined
as follows:
Plug-in unit EW91 Code Ul
Al Kll
E7
FS
(HESG 438 4S4) Ul AS
Kll
E7
FS
Plug-in unit EW91 Code
Ul
Al Kll E13 FS
(HESG 440 754 resp.
Ul
AS Kll E13 FS
EW9la HESG 441 721)
(Ul Al
Kll
El3 F6)
(Ul
AS Kll El3 F6)
Plug-in
unit KI91
Code FS
Il/O. S/
us
1.S R20 XS
EOO FAl VlO
Plug-in
unit
KZ91 Code
FS
Zl EKl LO us
1.S R20 XS
EOO FAl VlO
Plug-in
unit
KZ91-1 Code FS Zl EKl L4
us 1.S R21 XS
EOO FAl VlO
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