Table 88. Three-phase underexcitation protection (UEXPDIS)
Characteristic Value
Operation accuracy
1)
At the frequency f = f
n
±3.0% of the set value or ±0.2% Zb
Start time
2)3)
Typically 45 ms (±15 ms)
Reset time <50 ms
Reset ratio Typically 1.04
Retardation time Total retardation time when the impedance returns from the operating
circle <40 ms
Operate time accuracy in definite-time mode ±1.0% of the set value of ±20 ms
1) Adaptive DFT measurement used
2) f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
3) Includes the delay of the signal output contact
Table 89. Three-phase underexcitation protection (UEXPDIS) main settings
Parameter
Function Value (Range) Step
External Los Det Ena UEXPDIS 0...1 1
Diameter UEXPDIS 1...6000 %Zb 1
Offset UEXPDIS -1000...1000 %Zb 1
Displacement UEXPDIS -1000...1000 %Zb 1
Operate delay time UEXPDIS 0.06...200.00 s 0.01
Table 90. Three-phase underimpedance protection (UZPDIS)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±3.0% of the set value or ±0.2% × Z
b
Start time Typically 25 ms (±15 ms)
Reset time <50 ms
Reset ratio Typically 1.04
Retardation time <40 ms
Operate time accuracy in definite-time mode
1)2)
±1.0% of the set value or ±20 ms
1) Fn = 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 91. Three-phase underimpedance protection (UZPDIS) main settings
Parameter
Function Value (Range) Step
Polar reach UZPDIS 1...6000% Zb 1
Operate delay time UZPDIS 0.04...200.00 s 0.01
Generator Protection and Control
1MRS757583 C
Product version: 1.3
ABB 45
To Next Page
Loading...
