Title:
EFFECT OF BRAKING RESISTOR AND FAULT CURRENT LIMITER ON CIRCUIT BREAKER OPERATION

Authors:
Amir Ghorbani and Allahverdi Azadru

Abstract:
This paper presents a study of Transient Recovery Voltage (TRV) of a Circuit Breaker (CB) connected to transmission line with presence of Braking Resistor (BR). In order to effectively control the transient stability of the synchronous generator during the dynamic period, the BR unit is located at the generator terminal bus through the thyristor switching circuit and near the circuit breaker. It is shown in this paper that, when a fault occurs in the transmission line and circuit breaker acts, existence of breaking resistor and its natural performance during instability eliminates TVR in the circuit breaker completely. The Fault Current Limiter (FCL) in series with a circuit breaker could be practically used in electrical distribution systems. In this paper, an Electromagnetic Transient Program (EMTP) model of diode-bridge-type non-superconductor fault current limiter (NSFCL) is proposed. The results show that improvement in FCL controller is essential for eliminating TRV. The simulations are implemented by using the Electromagnetic Transients Program (EMTP/ATP).