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3 Mounting and Commissioning
From the operational measured value for the active power, the motoring power mea-
sured with the device can be derived. 50% of that value should be taken as the setting
for the reverse power protection.
Increase driving power.
On a further test check the stop valve criterion. It is assumed that the binary input
">SV tripped" is allocated correctly and is controlled by the stop valve criterion (by
a pressure switch or a limit switch at the stop valve).
Close stop valve.
From the operational measured value for the active power, the motoring power mea-
sured with the protection device can be derived.
If that value should be found to be unexpectedly less than the reverse power with the
stop valves closed, 50% of that value should be taken as the setting for the reverse
power protection.
Shut down the generator by activating the reverse power protection.
Activate the reverse power protection (address 3101) and - if used - the forward power
supervision (address 3201).
Checking the Un-
The angle error correction value W0 determined and configured with regard to reverse
power protection under address 204 applies also for the underexcitation protection.
derexcitation Pro-
tection
In this section the measured values of the reactive power have been read out, and
thus a plausibility check of that measured value with directional check has been
carried out. No further checks are required.
If nevertheless by an additional load level measurement a directional check is to be
performed, proceed as described in the following.
Caution!
Underexcitation may cause the generator fall out of step!
Nonobservance of the following procedures can result in minor injury or material
damage.
Operation with underexcitation is admissible only for a short period
For checking under load set the underexcitation protection (address 3001) to Block
relay.
The proper functioning is checked by approaching freely selected load levels under
overexcited and then underexcited conditions. The plausibility check is carried out by
reading out the relevant operational measured values from the protection device and
comparing them with the measured values obtained from the control and instrumen-
tation system.
Set the underexcitation protection to 3001 (address ON).
288
7UM61 Manual
C53000-G1176-C127-3
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