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4 ACCEPTANCE/PERIODIC TESTS
4 ACCEPTANCE/PERIODIC TESTS 4.1 OVERVIEW
WARNING: Remove all power from the relay by disconnecting the DC control power and
removing all voltage inputs to the rear terminals prior to opening the unit. Dangerous or
lethal voltages may be present inside the unit even if the power switch is OFF.
This section is a guide for testing the LPS-O. These tests are not necessary for incoming inspection as the
relay was tested at the factory with automated test equipment. The LPS-O is controlled by self-checking soft-
ware. If a system failure is detected, it is reported through the display and STATUS LED.
The tests in this section include self-tests of the relay status, display, and Keypad/Display Interface. Tests of
backup protection functions, measuring units, and zone timers are also included and can be performed at the
customer's discretion.
General Relay Tests:
•
T1 – Relay Status and Display Tests
•
T2 – Digital Output Tests
•
T3 – Configurable Input and Output Tests
•
T4 – AC System Input Test
The following test equipment is required:
•
A three-phase source of voltage and current at rated frequency.
•
A DC Control voltage source.
•
Three AC voltmeters.
•
Three AC ammeters.
•
A continuity tester or ohmmeter.
•
An IBM PC-compatible computer with a serial port and mouse.
•
An RS232 null modem cable to connect the PC to the LPS-O.
•
A precision timer for testing timed events.
The specific equipment requirements are listed in the instructions for each test and in the associated circuit
diagrams.
The three-phase AC sinusoidal voltage must be balanced and undistorted. Similarly, the DC power should
come from a "good" source with less than 5% ripple. A good source is within the voltage range listed in Chapter
7: SPECIFICATIONS.
Alternatively, a three-phase electronic test source may be used. In many cases, these devices allow simplifica-
tion of the test circuits.
The following drawings should be used for reference during testing.
Elementary Diagrams
•
Figure 1–11: ELEMENTARY DIAGRAM on page 1–25
GE Power Management
LPS-O Line Protection System
4.1 OVERVIEW
4.1.1 INTRODUCTION
4.1.2 TEST EQUIPMENT
4.1.3 DRAWINGS AND REFERENCES
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