ABB REL 356

ABB REL 356 Current Differential Protection
5-1
Testing
Testing
Introduction
An acceptance test of the relay verifies the operation of four subsystems.
• Analog Input
• Contact Input
• Relay Output
• Communication
Additionally, Phase Comparison functional tests (simulating internal faults) are performed.
Equipment Needed
Qty. Description
1 REL 356 Relay
1 Doble, Multi-amp or equivalent 3-Phase Test System
Test Setup
Current and Voltage Inputs
Connect the Relay Test System to REL 356 Relay.
Do not leave fault currents with trip relays energized for long periods of time.
Power
Connect the primary and secondary dc power. Consult the relay name-plate for rated voltage.
NOTE: Before turning on dc power check jumper positions on the Contact Input and Microprocessor modules.
Analog Input and Front Panel Metering Test
STEP 1
Turn on the primary and optional secondary dc input power if used. Make sure that the FREQ setting matches the line
frequency, and the RP setting is set to “NO” (Readout in secondary values). The “Relay in Service” LED on the front
panel should be lit.
STEP 2
NOTE: All ac voltage & current phase angles in this document are referenced to VA-G voltage (0 degrees). Positive
angles LEAD VA-G, negative angles LAG VA-G.
Fault impedance angles (FANG) are displayed as positive for inductive faults and negative for capacitive.
Apply the following ac quantities to the relay: