relay is a multi-shot reclosing relay designed to initiate reclosures of a circuit breaker. The relay is generally employed to provide four• shot reclosing on transmission and subtransmission lines. It is capable of initiating one high-speed reclosure and one, two, or three independently adjustable time-delay reclosures of a circuit breaker. If it is desired to omit one or two of the delayed reclosures, that adjustable cam or cams must be removed and the spacers supplied with the relay must be put in their places. The relay contains provisions for initiating a high-speed reclosure whenever a high-speed protective-relay tripout occurs. For any subsequent high-speed tripping and all time-delay tripping, the relay provides only time-delay reclosures that can be supervised by an external synchronism-check relay. At each point in the cycle where the NLR21E provides a delayed-reclose-output signal it will stop timing and wait for the circuit-breaker mechanism to respond (as indicated by a change in position of the
52/b contact) before it continues to time. With this arrangement, when the NLR21E is used with a synchronism-check device, the NLR will always wait for the synchronism-check relay to operate and energize the circuit-breaker-closing circuit before it continues to time out. One complete cycle of the NLR21E relay is adjustable in the range from 18 to 180 seconds. A quick-reset feature is also available so that the relay may be adjusted to reset after a successful reclosure. The front, side, and back views of the relay are shown in Figures 1, 2, and 3 respectively.
relay is a multi-shot reclosing relay designed to initiate reclosures of a circuit breaker. The relay is generally employed to provide four• shot reclosing on transmission and subtransmission lines. It is capable of initiating one high-speed reclosure and one, two, or three independently adjustable time-delay reclosures of a circuit breaker. If it is desired to omit one or two of the delayed reclosures, that adjustable cam or cams must be removed and the spacers supplied with the relay must be put in their places. The relay contains provisions for initiating a high-speed reclosure whenever a high-speed protective-relay tripout occurs. For any subsequent high-speed tripping and all time-delay tripping, the relay provides only time-delay reclosures that can be supervised by an external synchronism-check relay. At each point in the cycle where the NLR21E provides a delayed-reclose-output signal it will stop timing and wait for the circuit-breaker mechanism to respond (as indicated by a change in position of the52/b contact) before it continues to time. With this arrangement, when the NLR21E is used with a synchronism-check device, the NLR will always wait for the synchronism-check relay to operate and energize the circuit-breaker-closing circuit before it continues to time out. One complete cycle of the NLR21E relay is adjustable in the range from 18 to 180 seconds. A quick-reset feature is also available so that the relay may be adjusted to reset after a successful reclosure. The front, side, and back views of the relay are shown in Figures 1, 2, and 3 respectively.
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