T4: Ac System Input Test - GE DGP Series Instruction Manual

4 ACCEPTANCE TESTS
This test uses the INFORMATION–VALUES function of the MMI to determine that the voltages and currents
are applied to the proper connections on the terminal strip. The INFORMATION–VALUES function 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.
2. Using a 60 Hz source, set the current inputs to:
IA = 0.5 (0.1) A rms ∠0°
IB = 2.0 (0.4) A rms ∠–120°
IC = 15.0 (3.0) A rms ∠–240°
and set the voltage inputs to:
VA = 20 V rms ∠0°
VB = 70 V rms ∠–120°
VC = 120 V rms ∠–240°
3. Press the [INF] key. Scroll with arrow keys to the INF: VALUES heading, then press the [ENT] key. The
present values are now selected.
4. 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
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.
Other quantities are listed between the values of ANGLE VCN and GEN FREQ. These will
be tested in another section.
NOTE
If a printer is available, press the [PRT] key while in the INF: VALUES category and all present values will
be printed. Alternately, whenever the MMI display is blank, pressing the [CLR] key will automatically scroll
through all of the present values.
5. Repeat steps 2 through 4 using the following source frequencies: 30.5 and 79.5 Hz.
GE Power Management DGP Digital Generator Protection System
4.6 GENERAL RELAY TESTS

4.6.5 T4: AC SYSTEM INPUT TEST

4
4-
15