Siemens 7SA511 manual Metering Tests, Current and Frequency Metering Test, Model No

7SA511 Line Protection Relay Acceptance Tests

3.5 Metering Tests

These procedures check the analog channels to the relay’s microprocessor. Known values of current and voltage are connected to the current and voltage inputs, and the accuracy of the relay measurement is checked.

Current and Frequency Metering Test

This test uses a single-phase input and tests each current input separately.

Test Procedure

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

Table 3-5.Current and Frequency Metering Test Connections

Relay Terminal Connections

Test Equipment - Relay

+(where applicable)

-(where applicable)

DC Power supply - Power input

1-phase current source - IL1

4B1

3A1

4B2

3A2

Notes: 1. The frequency of the test current must be the same as the relay’s rated frequency (f N), as defined at address 7899.

2.The test current must match the relay’s rated current, IN. Refer to the relay model number to determine the rated current as indicated in the following chart.

Model No.

7SA5111-**A5*-****

7SA5115-**A5*-****

IN

1A

5A

2.Using the operator panel, display the address corresponding to the terminal pair that has the current source connected (see Table 3-6).

3.Ensure that the displayed percentage is within the tolerance indicated in Table 3-6

4.Move the current source to the next pair of terminals indicated in the table below. Repeat steps 2 through 4. Continue testing until all three pairs of current input terminals have been tested.

Table 3-6.Current Metering Test

Current Input Connections		Addr. No.
3A1 - 3A2	(IL1)	5710
2A1 - 2A2	(IL2)	5711
1A1 - 1A2	(IL3)	5712

LCD Text

IL1[%] = 100%

IL2[%] = 100%

IL3[%] = 100%

Tolerance

Min. Value	Max. Value
98%	102%
98%	102%
98%	102%

5. Display address 5709. Ensure that the displayed value, f[%], is between 99.5% and 100.5%.

3-10 July 27, 1995