Siemens 7SA511 manual Emergency Overcurrent Protection Test, Revers Interlock

7SA511 Line Protection Relay Acceptance Tests

Table 3-26.Testing the POTT Receive Signal.

Setting at Address 2202

Z1B RELEASE or

Z1B UNBLOCK

FD DIREC RELEASE or

FD UNBLOCK

Z1B BLOCKING or

￿PILOT WIRE COMP or

REVERS INTERLOCK

POTT Mode

Release modes in zone Z1B.

Directional comparison release fault detection, or unblocking mode with directional fault detection.

Blocking mode with zone Z1B, or comparison via pilot wires with zone Z1B, or reverse interlocking..

Action

Simulate a short circuit in zone Z1B but beyond zone Z1.

Simulate a short circuit in the forward Fault Detection zone, but beyond zone Z1B.

Simulate a short circuit within zone Z1B but beyond Z1.

Expected Result

Trips after T1B delay.

Trips immediately.

Trips after T2 or higher time delay.

3.13 Emergency Overcurrent Protection Test

Emergency overcurrent protection functions as a backup for distance protection in the event of a loss of the measured voltage inputs.

The overcurrent protection function provides a high-setelement and a definite time element. Each element will be tested separately. In the remaining sections, the required setup for testing each element is provided and then followed by a common test procedure.

In the common test procedure, a single phase test current is connected sequentially to each of the four current inputs. The test current is increased until the protection picks up and is then maintained until the trip time delay expires. The pickup current value and the time delay are then verified against the programmed settings.

July 27, 1995 3-27