Yes, we use a separate frequency relay. In the frequency function block REС 670, the minimum time setting is only 0.08 s. We want to use the frequency function block in the REC 670, but the datasheet does not have a function block diagram and does not fully describe the operation of the function...
Thank you very much for your answer. For automatic circuit breaker control we use relay from ABB, type REC 670, and relay from Siemens Siprotec 4, type 7VK611. We use intermediate relays to multiply contacts for shutdown circuits, signaling circuits and in the circuit of the central emergency...
Absolutely right. This is P5 – Policy 5: Emergency Operations. The Central Dispatch Service of Ukraine requires the fulfillment of these conditions. The reaction time, taking into account the shutdown time of the high-voltage breaker, should be no more than 0.15 s from the moment the frequency...
I have a problem with the use of automatic frequency offloading devices that must comply with the policy ENTSO-E. Previously, in Ukraine, the total operating time of automatic frequency unloading devices was 0.3 s, and according to the policy, the operating time should be in the range of...
