Siemens 7SA511 manual Definite Time Ov rcurrent Protection, Overcu rent T Procedure

7SA511 Line Protection Relay Acceptance Tests

Table 3-29.High-Set Overcurrent Test Settings

Addr.

2603

2608

LCD Text

I> phases 4.00 I/IN

IE> 4.00 I/IN

1.	Press the TargetReset key and reset the timer. Increase the input current until the LED
4.	Execute the common t st procedure in section 3.13.4.
3.13.3		Definite Time Ov rcurrent Protection
This test checks the operation of the definite time overcurrent protection element.
1.	Using programming procedures described in “Programming the Relay” set parameters as
	indicated in Table 3-30. All other relay settings should be factory presets.
Table 3-30.Definite Time Overcurrent Test Settings
Addr.			LCD Text
2605			I>> phas s 9.99 I/IN
4.	Execute the common			st procedure in section 3.13.4.
3.13.4		Overcu rent T		Procedure

indicated in Table 3-31 lights. Maintain this current for at least one second to ensure that all time delays expire.

CAUTION

Excessive test currents.

Test currents larger than 4IN may damage the relay if applied continuously.

Refer to the Specifications for overload ratings.

2.Verify that the pickup current value and the trip delay (timer value) match the values shown in Table 3-31 for this set of input current connections. Refer only to the set of four values for the specific overcurrent element that you are testing (e.g. definite time)

3.Reduce the input current until the LED turns off. Verify that the input current level at which the LED turns off is 95% of the value at which it turned on. Reduce the input current to zero.

4.Move the current source to the next pair of terminals indicated in Table 3-31. Repeat steps 1

through 4 until all four of the current input connections shown in the table have been tested.

5Reduce the input current to zero and power off the relay. If you wish to test another overcurrent element, return to section 3.13.1.

July 27, 1995 3-29