Siemens ISGS SG8158-00 User Manual download pdf (Page 82)

Appendix D: Acceptance Test Procedures

76 Siemens Energy & Automation, Inc.

ISGS Acceptance Test

Directional Neutral Time Overcurrent (67N)

Function

(Only Available with Phase-Neutral Connected VTs)

Set the ISGS as follows:

Parameter Set A 7103

5000:5 Current Transformer (CT) 1102

Curve SEA 5, Very Inverse 2002

1 A Nominal Pickup 2003

Time Dial per Chart 2005

Impedance to 45° 1907

Direction to Reverse 1908

Trip Matrixed to Trip 1 Contact 6401

Enable 67 2001

Disable Other Conflicting Functions 1501, 1551, 1601, 1651, 1801, 1901, 2001, 2301

Raise 51 Pickup to Maximum 1703

Phase

N Connections

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

2. Relay Disabled contact on terminals 19 and 20 opens.

3. Connect suitable variable source current

to phase A, terminal 3,

to phase B, terminal 5,

to phase C, terminal 7,

Connect terminals 4, 6, and 8 to terminal 9.

Connect terminal 10 to the common of the current sources.

4. 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

5. Apply nominal voltage to the relays voltage inputs, for example,

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 in forward direction, for example,

for example, 2.0 A

∠ 0 to phase A,

2.0 A

∠ 240 to phase B,

2.0 A

∠120 to phase C.

-relay should not go into pickup,

-reset test current to zero A,

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