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The output signal of testing element is assigned to the monitoring jack A.
The output signal numbers of the elements are as follows:
• Enter the signal number to observe the operation at the monitoring jack A as shown in
Section 6.5.1.
• Apply the three-phase balance voltage and the operating voltage value is checked by
increasing the magnitude of the voltage applied.
Check that the measured value is within 5% of the setting value.
Operating Time Check For Inverse Time (IDMT) Curve, NOV1I
• Change the voltage from the rated voltage to the test voltage quickly and measure the
operating time.
• Calculate the theoretical operating time using the characteristic equations shown in Section
2.2.4. Check the measured operating time.
6.5.1.11 Frequency Elements
The testing circuit is shown in Figure 6.5.12.
V
+
Variable-
Frequency /
−
Voltage source
+
DC
power
−
supply
+
DC
voltmeter
−
The output signal of testing element is assigned to the monitoring jack A.
Frequency elements and their output signal number are listed below.
Measuring element
FRQ1
FRQ2
FRQ3
FRQ4
FRQ5
FRQ6
FRQBLK
Element
Signal No.
NOV1D
232
NOV2D
233
f
Figure 6.5.12 Operating Value Test Circuit
Signal number
324
325
326
327
328
329
331
⎯
⎯
266
6 F 2 S 0 8 4 2
GRD150
TB1
-11
Monitoring
jack
-12
TB4 -18
-19
-20
(E)
A
0V
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