1. For a particular value of
Beta
the third harmonic neutral voltage is measured with the
generator in the no-load condition and the circuit breaker in the closed position.
2. With the same condition, the third harmonic neutral voltage with the circuit breaker
in the open position is measured.
3.
CB Open factor
should be set equal to the ratio of the third harmonic neutral voltage
measured with the circuit breaker in the closed position to that in the open.
4.2.7.6
Signals
Table 407:
27/59THN Input signals
Name
Type
Default
Description
V_3H_A
SIGNAL
0
Third harmonic of phase A voltage
V_3H_B
SIGNAL
0
Third harmonic of phase B voltage
V_3H_C
SIGNAL
0
Third harmonic of phase C voltage
V_3H_N
SIGNAL
0
Third harmonic of neutral voltage
V_3H_RES
SIGNAL
0
Third harmonic of residual voltage
BLOCK
BOOLEAN
0=False
Block signal for activating the blocking mode
GCB_CLOSED
BOOLEAN
0=False
Generator CB in closed position
Table 408:
27/59THN Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip
PICKUP
BOOLEAN
Pickup
INT_BLKD
BOOLEAN
Protection internally blocked
4.2.7.7
Settings
Table 409:
27/59THN Group settings (Basic)
Parameter
Values (Range)
Unit
Step
Default
Description
Beta
0.50...10.00
0.01
3.00
Portion of neutral side 3rd harmonic used as
bias
Voltage N 3.H Lim
0.005...0.200
xUn
0.001
0.010
Pickup value for 3rd harmonic residual
undervoltage protection
Trip delay time
20...300000
ms
10
20
Trip delay time
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
435
Technical Manual
Summary of Contents for Relion 615 series
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