4.163
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
The BSYNCHX SEL
OGIC
control equation should be set to block the
synchronism-check function whenever the generator circuit breaker is closed
and during other conditions that you select.
Manually Refine the 25RCFX Setting While the Generator Is in
Service.
Once the generator is in service and the generator breaker is closed,
you may want to refine the 25RCFX setting. The refinement removes the
effect of differences between the actual voltage transformer ratios and the
nameplate markings. These differences should be small, but they may be
additive and therefore significant. To refine the 25RCFX setting, take the
following steps:
Step 1. Use the front-panel interface or a PC connected to a relay serial
port to review the relay settings. Note the values of the
following settings:
PTRX := _________
PTRS := _________
SYNCPX := _________
25RCFX := _________
DELTAY_X := _________
Step 2. With the generator running and the generator main circuit
breaker closed, reduce the generator load current to as low as
possible. This is particularly important when a step-up
transformer is connected between the generator VTs and the
synchronism-check VT, as in Figure 4.107 (b).
Step 3. Using the front-panel or serial port METER command,
determine the magnitude of VS:
VS = __________ V primary
Step 4. Depending on the SYNCPX and DELTAY_X settings, note the
appropriate generator voltage, as follows:
When DELTAY_X := WYE, record the phase voltage named
by the SYNCPX setting VAX, VBX, or VCX (use VAX if the
setting is a numeric value):
V__ = _________ V primary
When DELTAY_X := DELTA, record the phase-to-phase
voltage named by the SYNCPX setting VABX, VBCX, or
VCAX (use VABX if the setting is a numeric value):
V__ = _________ V primary
Step 5. Calculate the secondary magnitude of VS by dividing the
primary value noted in Step 3 by the PTRS setting:
VSs = VS/PTRS = __________ V secondary
Step 6. Calculate the secondary magnitude of the generator voltage
noted in Step 4 by dividing that magnitude by the PTRX
setting:
VP = V_ (from Step 4)/PTRX = _________ V secondary
Содержание SEL-700G Series
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