Function
Characteristic
Value
1)
87G
Biased low stage
I
Fault
= 1.5 × set
Low trip value, 10 Hz
Typically 90...120 ms
Instantaneous high stage
I
Fault
= 1.5 × set
High trip value, 10 Hz
Typically 70...95 ms
27/59THN
Trip delay time = 20 ms
U
Fault
= 1.1 × 3. harmonic bias voltage, 10 Hz
U
Fault
= 1.1 × 3. harmonic bias voltage, 20 Hz
Typically 55 ms
Typically 40 ms
59N, 59G
Trip delay time = 40 ms
U
Fault
= 1.1 × set
Pickup value, 10 Hz
U
Fault
= 2.0 × set
Pickup value, 10 Hz
Typically 135 ms
Typically 95 ms
59
Trip delay time = 40 ms
U
Fault
= 1.1 × set
Pickup value, 10 Hz
U
Fault
= 2.0 × set
Pickup value, 10Hz
Typically 105 ms
Typically 65 ms
24
Trip delay time = 200 ms
Voltage change, 11 Hz
Typically 240 ms
1) Voltages present before the fault condition. Includes the delay of the output contact
Frequency adaptivity depends on the availability of voltages. The generator start-up
protection can be also extended by using wide peak-to-peak measurement mode
(operational from 2 Hz upward) with designated start-up overcurrent protection function
(51P). Before the generator is connected with the rest of the network by closing the circuit
breaker, the designated start-up overcurrent function should be either blocked or its start
value increased, as the
Pickup value
setting is typically lower than the nominal current.
11.6
Measurement modes
In many current or voltage dependent function blocks, there are various alternative
measuring principles.
•
RMS
•
DFT which is a numerically calculated fundamental component of the signal
•
Peak-to-peak
•
Peak-to-peak with peak backup
Consequently, the measurement mode can be selected according to the application.
In extreme cases, for example with high overcurrent or harmonic content, the
measurement modes function in a slightly different way. The operation accuracy is
defined with the frequency range of f/fn=0.95...1.05. In peak-to-peak and RMS
1MAC059074-MB A
Section 11
General function block features
615 series ANSI
1125
Technical Manual
Содержание Relion 615 series
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