General Zone Reach Testing Considerations - GE ALPS Instruction Manual

5.3 ZONE REACH AND TIMER TESTS
5.3 ZONE REACH AND TIMER TESTS
1. The Zone measuring units are checked in the test mode of operation. The A1 (programmable alarm) contact indicates
when the unit has operated. It is the only measure of whether the test passes or fails. The displayed target information
is for reference only. Different test equipment methods can alter the output from what is shown. The display output is
shown for reference only; it is not part of the test. The display includes the target information.
2. When a particular zone is under test, the other protection zones are disabled so that they do not time out and distort
the results of the zone under test.
The backup protection functions cause the relay to trip during zone testing, as they should. They must be disabled to iso-
late the zone reach unit under test. Before doing any of the reach tests make the following protection settings changes:
OVERCURRNT
(601) 50 = NO
(605) 50G = NO
(610) 51G = NO
OS BLOCKING
(1603) BLOCKWHAT = 3 (BLKNONE)
After the zone reach testing is completed, restore these settings to their pretest values.
NOTE
1. Protection settings:
5
Z1DISTANCE
(101) Z1PHASE = NO
(104) Z1GROUND = YES
Z2DISTANCE
(201) Z2PHASE = NO
(204) Z2GROUND = NO
Z3DISTANCE
(301) Z3PHASE = NO
(304) Z3GRND = NO
Z4DISTANCE
(401) Z4PHASE = NO
(405) Z4GRND = NO
2. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–12 for the appro-
priate phase under test.
3. Set the relay into test mode 14 (Any Zone1 Ground). The LUI displays ANY Z1 GRND ON
4. Set the voltage inputs to the following values:
VA: 67 volts rms ∠0°
VB: 67 volts rms ∠–120°
VC: 67 volts rms ∠+120°
Set the fault current, I
5.
∠I DEGREES
–49
–79
–109
†
Reference Only
6. Set the fault current, I
closes when the voltage is within the limits shown above.
5-8
, to the phase angle listed below (increase VA, VB, and VC to 75 V when ∠ I
op
VOLTS RMS
DISPLAYED TARGET
56 to 63 –
65 to 73 82 to 88
56 to 63 –
, to 8.2 (1.6) A rms. Reduce the voltage of the faulted phase and check that the A1 contact
op
ALPS Advanced Line Protection System
5 FUNCTIONAL TESTS (FACTORY SETTINGS)

5.3.1 GENERAL ZONE REACH TESTING CONSIDERATIONS

5.3.2 T11 – ZONE 1 GROUND REACH, M1G GROUND FAULTS
†
= –79°).
op
GE Power Management