Hitachi Relion 670 Series Applications Manual page 283

1MRK506375-UEN Rev. N
fed to the function, and the breaker operate time is taken from the setting. Incorrect operation may
occur if the tBreaker setting is set incorrectly. Hence the operation accuracy of the XENCPOW
function depends strongly on the accuracy of the breaker operate time setting.
The parameters for the XENCPOW function are set via the local HMI or PCM600.
The common base IED values for primary current IBase and primary voltage UBase are set in the
global base values for settings function GBASVAL.
GlobalBaseSel: To select the GBASVAL function for the reference of base values.
Operation: On or Off.
ULowLimit: To set the voltage range where the transformer can be energized without looking the
voltage peak once the START input is activated. The typical setting is 20 % of UBase.
UHighLimit: To set the voltage range where the transformer should not be energized even when the
START input is activated. The typical setting is 120 % of UBase.
tBreaker: It should be set to match the total closing time of the circuit breaker and it should also
include possible auxiliary relays in the closing circuit. A typical setting is 80-150 ms.
tPulse: To set the close command pulse duration. The setting must be grater than the critical impulse
time of the circuit breakers to be closed from the transformer energizing control function. The typical
setting is 200 ms.
12.12.3.1 Setting examples
Refer to the transformer manufacturer's operating requirements for the UHighLimit and ULowLimit
settings.
Refer to the transformer circuit breaker manufacturer's operating requirements for the tBreaker and
tPulse settings.
Railway application RER670
Application manual
© 2017 - 2023 Hitachi Energy. All rights reserved
Section 12
Control
GUID-5A5D3D3B-1BD2-43FE-B07C-587DBAF1AF9B v3
GUID-82CDBB9C-1150-4706-951A-17A143E725C3 v1
277