In all electrical relays, the moving contacts are held in place by a continuous force, known as the controlling force. This force keeps the contacts in their normal positions and can be gravitational, spring.
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One approach to test the total protection system is to use primary injection techniques (see appendix H) that trigger protective relays and lockout relay, trip circuit breakers, and initiate annunciations and indications. Protective circuit functional testing, including lockout relay testing, must take place immediately upon installation, every 2 years thereafter, and upon any change in wiring. If applicable, documentation is required detailing how verified protection segments overlap to ensure there is not a gap. But failure to operate as intended can result in extensive damage, extended power outages, and loss of life.
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This guide explores the different types of protection relays and their testing procedures, with a focus on tools like secondary injection test sets and three-phase relay test sets. The testing and verification of protection devices and arrangements introduces a number of issues. Modern networks rely on and utilize relay protection systems in order to maintain a safe electrical environment by continuously monitoring devices for problems and controlling the grid to isolate problematic areas.
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The CMC 356 is the universal six-phase testing solution for all generations and types of protection relays, where highest versatility, amplitude and power are required.
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What are Protective Relays, or Protection Relays? Protective relays are used in industrial power generation and supply systems to open and isolate branch circuits in the case of excessive current. A surge protector, spike suppressor, surge suppressor, surge diverter, surge protection device (SPD), transient voltage suppressor (TVS), or transient voltage surge suppressor (TVSS) is an appliance or device intended to protect electrical devices in alternating current (AC) circuits from. In essence, it surrounds the devices and the electrical supply, acting as a shield. It functions as a watchdog by constantly surveying multiple system components including voltage, current, frequency, and phase angle.
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