Common use of Protective Relaying Clause in Contracts

Protective Relaying. on the Inter-tie Circuit Breaker Generator shall be responsible for tripping their inter-tie breaker and/or their generator breaker within 0.3 seconds after the occurrence of a fault on the electric facilities serving their installation hereby removing their generator and isolating transformer as a source of fault current. Equipment shall be installed to trip Generator’s inter-tie breaker whenever the MSEDCL supply is de-energized. The inter-tie breaker shall be automatically locked out and prevented from being closed into a de-energized MSEDCL system or partially de-energized system (loss of one phase). A synchronism check relay that operates when the voltage and phase angle differences of two systems are within certain limits and thus allows the two systems to be paralleled. An under voltage and over voltage relay that operates on predetermined values of either under voltage or over voltage within a system. (This relay may be either a combination relay or two individual relays designed to provide both functions.) Grid disturbance relay. An over and under frequency relay that operated when the system frequency deviates from predetermined limits for a time greater than its preset value. A differential over current relay of percentage type. Local backup protection provided.

Protective Relaying. on the Inter-tie Circuit Breaker Generator shall be responsible for tripping their inter-tie breaker and/or their generator breaker within 0.3 seconds after the occurrence of a fault on the electric facilities serving their installation hereby removing their generator and isolating transformer as a source of fault current. Equipment shall be installed to trip Generator’s inter-tie breaker whenever the MSEDCL supply is de-energized. The inter-tie breaker shall be automatically locked out and prevented from being closed into a de-de- energized MSEDCL system or partially de-energized system (loss of one phase). A synchronism check relay that operates when the voltage and phase angle differences of two systems are within certain limits and thus allows the two systems to be paralleled. An under voltage and over voltage relay that operates on predetermined values of either under voltage or over voltage within a system. (This relay may be either a combination relay or two individual relays designed to provide both functions.) Grid disturbance relay. An over and under frequency relay that operated when the system frequency deviates from predetermined limits for a time greater than its preset value. A differential over current relay of percentage type. Local backup protection provided.