Siemens 7SA511 manual FNo, Input/Output Units

7SA511 Line Protection Relay Acceptance Tests

Table 3-32. Prerequisite Settings for the Directional Definite Time Test.

Without Directional Comparison
Addr.	LCD Text (1st line)	Description	Setting
7808	EARTH FAULT	Type of high-resistance ground fault	DIRECTIONAL D.T.
		protection
3101	E/F D.T.	Turn the directional, definite time	ON
		ground fault protection on or off
With Directional Comparison

Addr.	LCD Text (1st line)	Description	Setting
7808	EARTH FAULT	Type of high-resistance ground fault	DIREC. COMPARISON
		protection

3201

E/F COMPAR

Turn the directional, definite time ground fault protection function with directional comparison on or off

ON

To perform this test, you will need to assign logical functions to the I/O unit as indicated in Table 3-33. This is necessary since these functions are not preset to any I/O at the factory.

Table 3-33. Required Input/Output Unit Assignments.

FNo

772

773

090

LCD Text

E/F T-> expir

E/F T<> expir

>E/F Recept

Description

Ground fault protection, directional trip delay expired

Ground fault protection, nondirectional back up trip delay expired

Ground fault protection carrier reception signal

Input/Output Units

Signal Relay or LED

Signal Relay or LED

Binary Input

Test Procedure

1.For directional, definite time ground fault protection, the nondirectional backup element is checked first by slowly increasing the ground current.

Note: For parallel line compensation (relay model 7SA511*-**A5*-2***), increase one phase current for this test. In this case, address 1111 must be set to “PARALLEL LINE.”

2.After exceeding 75% of the pickup value setting at address 3103 (IE>), check the event log under address block 5200 for the message E/F Fault I> (FNo 761), which should appear in the target log.

3.When the pickup value at address 3103 is exceeded, the message E/F Fault I>> (FNo 762) should appear in the target log.

4.When the trip delay for the nondirectional backup element (address 3108) has expired, the I/O unit (LED or signal relay) assigned to, E/F T<> expir (FNo 773), should activate. Additionally, the E/F Trip ->(FNo 781) message should appear in the event log,.

5.To test the directional element, a residual voltage is necessary. If address 1109 is set as VT DELTA is “CONNECTED,” the voltage from the residual voltage winding is applied to the measured value input or, a single-phase voltage will be applied to the phase into which the current is fed.

July 27, 1995 3-31