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4 ACCEPTANCE/PERIODIC TESTS
4 ACCEPTANCE/PERIODIC TESTS 4.1 OVERVIEW
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.
WARNING
This section is a guide for testing the LPS-D. These tests are not necessary for incoming inspection as the
relay was tested at the factory with automated test equipment. The LPS-D 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 (Local User
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 (Self Tests)
•
T2 – Digital Output Test
•
T3 – Configurable Input and Output Test
•
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-D.
•
A precision timer for testing timed events.
Specific equipment requirements are listed in the instructions for each test and 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.
GE Power Management
LPS-D Line Protection System
4.1 OVERVIEW
4.1.1 INTRODUCTION
4.1.2 TEST EQUIPMENT
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