GE DGP Series Instruction Manual page 149

5 PERIODIC TESTS
This initial test uses the INFORMATION–VALUES command to determine that the voltages and currents are
applied to the proper connections on the terminal strip. The INFORMATION–VALUES command can be used
at any time during the test to verify that the relay has the correct voltages and currents applied.
1. Connect the relay as shown in Figure 4–5: AC SYSTEM INPUT TEST CONNECTIONS on page 4–16.
2. Using a 60 Hz source set the current (rms) inputs to:
IA = 0.5 (0.1) A ∠0°,
IB = 2.0 (0.4) A ∠–120°,
IC = 15.0 (3.0) A ∠–240°
3. Set the voltage (rms) inputs to:
VA = 20 V ∠0°,
VB = 70 V ∠–120°,
VC = 120 V ∠–240°.
4. Press the [INF] key. Scroll with arrow keys to the INF: VALUES heading, then press the [ENT] key. The
present values are now selected.
5. With the arrow keys, scroll through the values of:
IAS, ANGLE IAS
IBS, ANGLE IBS
ICS, ANGLE ICS
IAR, ANGLE IAR
IBR, ANGLE IBR
ICR, ANGLE ICR
VAN, ANGLE VAN
VBN, ANGLE VBN
VCN, ANGLE VCN
GEN FREQ
6. Check that all frequency measurements are within 0.01 Hz and all voltage and current measurements are
within 3% of their set amplitude and 1° of their set phase.
There are other quantities listed between the values of ANGLE VCN and GEN FREQ these will
be tested in another section.
NOTE
7. If a PC is connected to the DGP, the present values can be read with the DGP-Link software. Alternately,
whenever the MMI display is blank, pressing the [CLR] key will automatically scroll through all of the
present values.
8. Repeat steps 2 through 6 using the following source frequencies: 30.5 and 79.5 Hz.
GE Power Management DGP Digital Generator Protection System
5.2 RELAY TESTS
5.2.4 T4: AC SYSTEM INPUT TEST
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