Siemens 7SA511 Independent Zones Z1, Z2, and Z3, Zone Test Type, Overreach Zones Z1B and Z1L

7SA511 Line Protection RelayAcceptance Tests

3.10.1 Independent Zones Z1, Z2, and Z3

For phase-to-ground testing, the test current is applied to one phase and to the ground current path. For testing phase-to-phase, the test current must flow through the tested phases in opposite directions. To avoid errors, ensure that the two phase voltages are symmetrical. For the factory set values and IP/IN = 2, the resultant voltages will be as described in Table 3-19.

Table 3-19.Test Voltages VP for Zones Z3, Z2, and Z1 at IP = 2 x IN and Factory Presettings.

Zone	Test Type	fP = 0￿	fP = 90￿
Z3	3-phase	VP = 10 V	VP = 20 V

Z2

Z1

2-phase

1-phase

3-phase

2-phase

1-phase

3-phase

2-phase

1-phase

VP = 20 V

VP = 40 V

VP = 5 V

VP = 10 V

VP = 20 V

VP = 2.5 V

VP = 5 V

VP = 10 V

VP = 40 V

VP = 40 V

VP = 10 V

VP = 20 V

VP = 20 V

VP = 5 V

VP = 10 V

VP = 10 V

3.10.2 Overreach Zones Z1B and Z1L

To test overreach zone Z1B, function >Extens. Z1B (FNo 065) must be assigned to a binary input. See Chapter 5, “Programming the Relay,” for step-by-step instruction on assigning this function to a binary input.

Overreach zone Z1L is used only in conjunction with multi-shot auto-reclose. Therefore, this distance zone can be checked when testing the internal auto-reclose function. This section is applicable only to relay models 7SA511*-**A5*-**B/C/F/G*.

For the factory set values and IP/IN = 2, the resultant voltages for overreach zones Z1B and Z1L will be as described in Table 3-20.

Table 3-20.Test Voltages VP for Overreach Zones Z1B and Z1L at IP = 2 x IN and Factory Presettings.

Zone Test Type fP = 0￿ fP = 90￿

Z1B

Z1L

3-phase

2-phase

1-phase

3-phase

2-phase

1-phase

VP = 3 V

VP = 6 V

VP = 12 V

VP = 4 V

VP = 8 V

VP = 16 V

VP = 6 V

VP = 12 V

VP = 12 V

VP = 8 V

VP = 16 V

VP = 16 V

Table 3-18 gives the factors KX and KR for your own settings, for test angles fP = 0￿and 90￿, and the generally applicable formulas.

July 27, 1995 3-23