10-4
Testing and Troubleshooting
Date Code 20020129
SEL-387E Instruction Manual
A
CCEPTANCE
T
ESTING
When:
When qualifying a relay model to be used on the utility system.
Goal:
a) Ensure relay meets published critical performance specifications such as operating
speed and element accuracy.
b) Ensure that the relay meets the requirements of the intended application.
c) Gain familiarity with relay settings and capabilities.
What to test: All protection elements and logic functions critical to the intended application.
SEL performs detailed acceptance testing on all new relay models and versions. We are certain
that the relays we ship meet their published specifications. It is important for you to perform
acceptance testing on a relay if you are unfamiliar with its operating theory, protection scheme
logic, or settings. This helps ensure the accuracy and correctness of the relay settings when you
issue them.
Equipment Required
The following equipment is necessary to perform all of the acceptance tests:
1. A terminal or computer with terminal emulation with EIA-232 serial interface
2. Interconnecting data cable between terminal and relay
3. Source of relay control power
4. Source of two currents at nominal frequency
5. Source of one current at two times and/or five times nominal frequency
6. Source of variable three-phase voltage adjustable from 40 to 70 Hz
7. Ohmmeter or contact opening/closing sensing device
Initial Checkout
Step 1.
Purpose: Be sure you received the relay in satisfactory condition.
Method: Inspect the instrument for physical damage such as dents or rattles.
Step 2.
Purpose: Verify requirements for relay logic inputs, control power voltage level,
and voltage and current inputs.
