Basler Electric BE1-87T - Manual (Page 117)

9171300990 Rev V BE1-87T Test Procedures 5-21
Table 5-9. Input Signals to Comparison Circuits Based On Jumper Positions
Jumper Ain Bin Cin
WYE I
A
I
B
I
C
Jumper Ain Bin Cin
∆ 1
I
A
-I
C
I
B
-I
A
I
C
-I
B
∆ 2
I
A
-I
C
I
B
-I
C
I
C
-I
A
The following connections can be used to verify proper relay jumper positions on a three-phase unit or to
test an in-service relay without changing the jumpers. These tests only require two input current sources
(180° out of phase). In most cases, the specified input pair will properly test only two of the three phases
within the relay. In order to test all three of the relay phases, two of the three connection pairings should
be tested. This confirms relay operation.
Jumper Positions WYE-WYE
Step 1. Connect Input 1 current to terminals A and B.
Connect Input 2 current to terminals A and B.
This verifies the A- and B-phase differential circuits which respond together, as provided earlier
in the Verification Tests: 5 Amp CT or Verification Tests: 1 Amp CT in this section. The C-
phase differential circuit sees no current and does not respond.
Step 2. Connect Input 1 current to terminals A and C.
Connect Input 2 current to terminals A and C.
This verifies the A- and C-phase differential circuits which respond together as provided earlier
in the Verification Tests: 5 Amp CT or Verification Tests: 1 Amp CT in this section. The B-
phase differential circuit sees no current and does not respond.
Step 3. Connect Input 1 current to terminals B and C.
Connect Input 2 current to terminals B and C.
This verifies the B- and C-phase differential circuits which respond together, as provided earlier
in the Verification Tests: 5 Amp CT or Verification Tests: 1 Amp CT in this section. The A-
phase differential circuit sees no current and does not respond.
Jumper Positions WYE-∆1
Step 1. Connect Input 1 current to terminals A and B.
Connect Input 2 current to terminals A and N.
This verifies the A- and B-phase differential circuits which respond together, as provided earlier
in the Verification Tests: 5 Amp CT or Verification Tests: 1 Amp CT in this section. The C-
phase differential circuit sees no current and does not respond.
Step 2. Connect Input 1 current to terminals A and C.
Connect Input 2 current to terminals N and C.