This function checks the voltages upstream and downstream of a circuit breaker and allows closing when the differences in amplitude, frequency and phase are within authorized limits. Characteristics...
The restricted earth fault protection (ANSI 64REF) can be applied if the downstream power system neutral is earthed at the transformer (document attached). This is a differential protection function...
If a breaker fails to be triggered by a tripping order, as detected by the non-extinction of the fault current, this backup protection sends a tripping order to the upstream or adjacent breakers.
Earth fault protection, with selective tripping according to fault current direction. 3 types of operation: type 1: the protection function uses the projection of the I0 vector type 2: the protection...
Phase-to-phase short-circuit protection, for generators. The current tripping set point is voltage-adjusted in order to be sensitive to faults close to the generator which cause voltage drops and...
The temperature rise of each winding of the transformer, designed for operation under normal service conditions, shall not exceed the corresponding limit specified in following table when tested in...
Protection against phase unbalance, detected by the measurement of negative sequence current: sensitive protection to detect 2-phase faults at the ends of long lines protection of equipment against...
Although almost 80-90% of the features are the same, there are differences between the IEC and UL(NEMA)/ANSI/CSA breakers. Depending on the frame, the following components may be different: •...
The password can be reset by clearing the program inside the Zelio either by Transfering a new program to the Zelio Or Clearing the program that already exist by updating the firmware Kindly find the...
issue: Customer wants to know the value of the symmetrical and asymmetrical breaking current of the circuit breaker and what do they mean. Environment: Circuit Breaker Resolution: - Symmetrical...
There is often confusion between the in-phase and the In-sync features of ASCO transfer switches. It is important to understand the difference between these features especially during the process of...
The selection should be done after derating the Circuit Breaker taking into consideration voltage variation and capacitors tolerances that could increase nominal current up to 1.5In. The Derating...
Issue: Testing phase loss on a meter doesn't result in a null voltage reading. Environmnet: EasyLogic Series Power Meters PowerLogic Series Power Meters Resolution: The voltage seen is what we...
Issue: Having two different values for RL ( Lead resistance from the CT to the relay); RL from the phase CT to the relay and RL from the neutral point CT to the relay Environment: Protection Function...
