Oil Circuit Breakers
Oil Circuit Breaker Operation
By A JOSEPH
INTRODUCTION In this study the operation and maintenance required on the Takaoka Tank Type Oil Circuit Breaker (Type L4) and the JB427 will be explored. The circuit breakers used for this study is the Diamond Vale 33kV Circuit Breaker at Mt Pleasant Substation and the #0 33kV Circuit Breaker at Barataria Substation respectively. Figure [ 1 ] : THE TAKAOKA OIL CIRCUIT BREAKER
Figure 2 : The jb427 oil circuit breaker
CIRCUIT BREAKER MAIN COMPONENTS The main components of the Oil Circuit Breaker are the following: * Bushing * Tank * Arc Extinction Chamber (Turbulator) * Operating Mechanism (Opening and Closing Mechanism) Bushing - Bushings must be able to withstand short-circuit currents which may flow through the circuit breaker. The bushings of both breakers are of porcelain type and can be either oil filled (Takaoka) or compound filled (JB427) Tank - The tank contains the insulating medium for the circuit breaker which is oil. Additionally, it contains the opening mechanism, the fixed and moving contacts. Oil Circuit Breakers can be classified with reference to the type of tank construction. The two types are minimum oil circuit breaker and bulk oil circuit breakers The Takaoka is a minimum oil circuit breaker. This means these circuit breakers use a small quantity of oil per tank, where the oil is used only for arc extinction. For each phase, there exists a different physical compartment (tank) of oil, hence three (3) tanks. The JB427 is a bulk oil circuit breaker. This means these breakers use large quantity oil, all of which is contained in one tank. The oil is used both for arc extinction and insulation of the current conducting parts
By A JOSEPH
INTRODUCTION In this study the operation and maintenance required on the Takaoka Tank Type Oil Circuit Breaker (Type L4) and the JB427 will be explored. The circuit breakers used for this study is the Diamond Vale 33kV Circuit Breaker at Mt Pleasant Substation and the #0 33kV Circuit Breaker at Barataria Substation respectively. Figure [ 1 ] : THE TAKAOKA OIL CIRCUIT BREAKER
Figure 2 : The jb427 oil circuit breaker
CIRCUIT BREAKER MAIN COMPONENTS The main components of the Oil Circuit Breaker are the following: * Bushing * Tank * Arc Extinction Chamber (Turbulator) * Operating Mechanism (Opening and Closing Mechanism) Bushing - Bushings must be able to withstand short-circuit currents which may flow through the circuit breaker. The bushings of both breakers are of porcelain type and can be either oil filled (Takaoka) or compound filled (JB427) Tank - The tank contains the insulating medium for the circuit breaker which is oil. Additionally, it contains the opening mechanism, the fixed and moving contacts. Oil Circuit Breakers can be classified with reference to the type of tank construction. The two types are minimum oil circuit breaker and bulk oil circuit breakers The Takaoka is a minimum oil circuit breaker. This means these circuit breakers use a small quantity of oil per tank, where the oil is used only for arc extinction. For each phase, there exists a different physical compartment (tank) of oil, hence three (3) tanks. The JB427 is a bulk oil circuit breaker. This means these breakers use large quantity oil, all of which is contained in one tank. The oil is used both for arc extinction and insulation of the current conducting parts