Alstom SHPM 101, Руководство по обслуживанию

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SERVICE MANUAL R5888C
QUADRAMHO Chapter 6
Page 3 of 12
4.2 General notes
All the relay contacts can be prevented from operating while the rest of the relay
functions normally and gives indications, also signals for operation times can be
taken from the monitor point box. It is however necessary to check the operation of
contacts during testing, so alternative trip isolation must be obtained as necessary
by removing the circuit breaker trip isolation links.
The heavy current bridging plugs can now be replaced by the test plugs. The only
connections that must be made before insertion are the CT shorting links (see
Figure 4) on the red ringed terminals 1 to 2, 3 to 4, 5 to 6 and 7 to 8 of the test
plug, going in the 1Y position.
The notes in raised letters on the side of the test plugs should be observed.
The equipment is now effectively isolated from the system.
The various tests must be done in the order described in flow chart 1 and the
various paths through the other flow charts must be followed in order to identify a
faulty module. Select SW1-9 to the left hand positions. Connect the 25 way
monitor point box. See Figure 2 for details.
4.3 Initial checks, including self-check facilities
If the dc supplies are available on the panel they can be checked on test plug 1Z
red ringed terminals 5(+) and 6(–). If the supply is within the required operative
range it can be linked through to the relay. If the panel supply is not available a
suitable supply could be connected to the relay side terminals 5 and 6 of the test
plug.
The bridge on terminals 10 of the 1Z test plug should be made and the relay
available green LED on module 6 should light. If the dc is removed and re-applied
it will be seen that all the red LEDs on module 4 light while the relay goes through
its power procedure and at the end of it, the relay available LED lights. (A scheme
option number must be selected, see Figure 5).
All of the following are monitored continuously by circuits within the relay:
i) Internal dc voltage rails for +5V, +12V, +24V and –12V.
ii) The internal clock.
iii) The reference voltages for the level detectors.
iv) The processor running through its program.
If a fault is detected in any of the above, the relay operative LED will extinguish
and the fault finding instructions in Section 1 should be consulted.
Note: It should be remembered later that the inoperative alarm is given if the
output relays are inhibited by any means or if the voltage transformer
supervision is set to block and zero sequence volts are detected.
Connect three phase to neutral voltages, each above 70% of 63.5V to the relay
side terminals 1, 2, 3 and 4 of test block 1Z, as shown in Figure 4, an additional
self-check on the comparators is made available if SW5 on module 4 is to the right
(see Figure 5). This feature can now be initiated by pressing the reset button, when
all the red LED, except power swing, will be seen to flash briefly If a failure is
detected the relay available LED will extinguish. In this case or if the LED do not
momentarily flash refer to Section 5.3.