The relay testing equipment is a portable apparatus, which is designed for checking the operating characteristics of protective relays on site. Since a relay in the system is called into action to deal with a fault only in a long while, its failure to operate correctly on that occasion means unavoidable damage to plant or waste of money spent on installation. Periodic field testing is the best way of ensuring the integrity of the protective relays, but the position is complicated because of the fact that the protective relay is solely concerned with fault conditions, and hence it cannot readily be tested under normal operating conditions.

Specifications :
Phase angle regulation

• 0 - 360 deg. with coarse and fine regulation
• 60 deg. in step and in between continuously variable

Instruments

• 1 no digital volt meter, 0 - 300 volts to monitor output test voltage with a facility to inject voltage suddenly. A parallel potential free contact to initiate digital timer.
• 1 no phase angle meter, 0 - 360 deg. range (optional)
• 1 no digital time interval meter, 0 - 1000 sec. with a facility of start / stop the timer with NO/NC potential free contacts. (optional)

Input supply system
415 volts, 3 phase wire, 50 hz
Output I
A.C. voltage source with phase shifting arrangement
Voltage regulations
0 - 200 volts continuously variable at a max. capacity of 20 V
Output II
D.C. Voltage source.
Range
110 volts with / - 20% with fine control
Capacity
250 MA.

Instrument
digital D.C. Voltmeter, 0 200 volts.
Output III
D.C. Current source.
Range
0 - 1000 ma.
Regulation
0 - 1000 ma. continuously variable