Schweitzer Engineering Laboratories SEL-787 - Figure 10.1 Low-Level Test Interface (J2 and J3); Table 10.1 Resultant Scale Factors for Inputs

10.2
SEL-787 Relay Instruction Manual Date Code 20081022
Testing and Troubleshooting
Testing Tools
Use the TARGET command to view the state of relay control inputs, relay
outputs, and relay elements individually during a test. The TARGET
command is available at the serial ports and the front panel. See Section 7:
Communications and Section 8: Front-Panel Operations.
Low-Level Test
Interface
The SEL-787 has a low-level test interface on the 6 ACI current card (Slot Z)
and 1 ACI Neutral current card or 1 ACI/3 AVI current/voltage card (Slot E).
You can test the relay in either of two ways: conventionally by applying ac
signals to the relay inputs or by applying low magnitude ac voltage signals to
the test interface on the printed circuit boards.
The SEL-RTS Low-Level Relay Test System can be used to provide signals to
test the relay. Figure 10.1 shows the Test Interface connectors.
Figure 10.1 Low-Level Test Interface (J2 and J3)
Note that there are two options for the Slot E for low level interface:
➤ The 1 ACI card supports neutral current input IN only.
➤ The 1 ACI/3 AVI card supports the neutral current input IN and
three-phase ac voltage inputs VA, VB, and VC.
Connector J3 is the same in both options.
Table 10.1 shows the signal scale factor information used by the SEL-5401
program for the calibrated inputs.
Table 10.1 Resultant Scale Factors for Inputs
Channel
Label
Circuit Board &
Connector
SEL-5401
Channel No.
Nominal Input
Scale Factor
(A/V or V/V)
IAW1 6 ACI card/J2 1 5 A/1 A 106.14/21.23
IBW1 6 ACI card/J2 2 5 A/1 A 106.14/21.23
ICW1 6 ACI card/J2 3 5 A/1 A 106.14/21.23
IAW2 6 ACI card/J2 4 5 A/1 A 106.14/21.23
IBW2 6 ACI card/J2 5 5 A/1 A 106.14/21.23
ICW2 6 ACI card/J2 6 5 A/1 A 106.14/21.23
VA 1 ACI/3 AVI card/J3 7 250 V 218.4
VB 1 ACI/3 AVI card/J3 8 250 V 218.4
VC 1 ACI/3 AVI card/J3 9 250 V 218.4
IN 1 ACI/3 AVI card/J3 12 5 A/1 A 106.14/21.23
NOTE: The SEL-RTS Relay Test
System consists of the SEL-AMS
Adaptive Multichannel Source and
SEL-5401 Test System Software.
(A) Connector J2 on 6 ACI Current Input Board (B) Connector J3 on 1 ACI/3 AVI Current
Voltage Input Board
1
IN VC VB VA
GND GND GND GND
1
ICW2 IBW2 IAW2 ICW1 IBW1 IAW1
GND GND GND GND GND GND