Siemens 7SA511 manual Coordination Times, Testing the Power Swing Blocking Function Optional

7SA511 Line Protection RelayAcceptance Tests

3.10.3 Coordination Times

For each time element at least one additional dynamic test should be made to check the correct signaling. In this case, a short circuit approximately in the middle of the two time zones would be simulated.

When measuring the response times, remember that the inherent measurement and trip time of the relay is additive to the programmed delay time.

3.11 Testing the Power Swing Blocking Function (Optional)

This test checks the power swing/block function and is applicable for relay models 7SA511*- **A5*-***1/3. Skip this section if your relay configuration does not have the power swing/block function.

Testing of power swing detection requires both three-phase current and three-phase voltage input.

Test Procedure

1. Connect test equipment to the relay as indicated in Table 3-21.

Table 3-21.Power Swing Test Connections

Relay Terminal Connections

Test Equipment - Relay

+(where applicable)

-(where applicable)

DC Power supply - Power input

3-phase current source	- IL1
	- IL2
	- IL3
3-phase voltage source	- VL1
	- VL2
	- VL3

4B1

3A1

2A1

1A1

3B1

3B2

3B3

4B2

3A2

2A2

1A2

2B3

2B3

2B3

Note: The frequency of the test current must be the same as the relay’s rated frequency (fN), as defined at address 7899.

2.Set the input current and voltage to zero.

3.Power on the relay.

4.Using the programming procedures described in “Programming the Relay,” set parameters as indicated in Table 3-22.

Table 3-22.Power Swing Test Settings

Addr.

7813

2002

LCD Text

POWER SWING EXIST

P/S PROGR. OUT-OF-STEP TRIP

5.Increase the input current (equally for all three phases) until it reaches 2IN. Increase the input voltage (equally for all three phases) until it reaches VN SECONDARY. The phase angle between

3-24 July 27, 1995