Siemens SG8158-00 Directional Phase Time Overcurrent 67 Function, Phase-Neutral Connected VTs

D

Appendix D: Acceptance Test Procedures

ISGS Acceptance Test	Directional Phase Time Overcurrent (67) Function
	(Phase-Neutral Connected VTs)
Set the ISGS as follows:
Parameter Set A	7103
5000:5 Current Transformer (CT)	1101
Curve SEA 5, Very Inverse	1902
1 A Nominal Pickup	1903
Time Dial per Chart	1905
Impedance to 45°	1907
Direction to Reverse	1908
Trip Matrixed to Trip 1 Contact	6401
Enable 67	1901
Disable Other Conflicting Functions	1501, 1551, 1601, 1651, 1801, 1901, 2001, 2301
Raise 51 Pickup to Maximum	1703

Phase

A B C Connections

1. Connect the appropriate source of control voltage to terminals 13 (+) and 12 (-).

Relay Disabled contact on terminals 19 and 20 opens.

2.Connect suitable variable source current

to phase A, terminals 3 and 4,

to phase B, terminals 5 and 6,

to phase C, terminals 7 and 8,

3.Connect suitable AC voltage

to phase A, terminals 41 and 42,

to phase B, terminals 43 and 44,

to phase C, terminals 45 and 46,

Connect timer to Trip 1 contacts, terminals 1 and 2.

Pickup

4. Apply nominal voltage to the relay’s voltage inputs,

for example, 69	V ∠ 0 to phase A,
69	V ∠ 240 to phase B,
69	V ∠ 120 to phase C.

Apply 2x pickup current to phase A and B in forward direction,

for example, 2.0 A ∠ 30 to phase A and 2.0 A ∠ 210 to phase B, or

2.0A ∠ 270 to phase B and 2.0 A ∠ 90 to phase C, or

2.0A ∠150 to phase C and 2.0 A ∠ 330 to phase A.

-relay should not go into pickup,

-reset test current to zero A,

-increase phase A and phase B current in reverse direction until relay picks up (at 1.06 x pickup) for example, 1.06 A ∠ 210 to phase A and 1.06 A ∠ 30 to phase B, or

1.06A ∠ 90 to phase B and 1.06 A ∠ 270 to phase C, or

1.06A ∠ 330 to phase C and 1.06 A ∠ 150 to phase A.

72 Siemens Energy & Automation, Inc.