Tag Archives | Circuit Breakers

Air-Blast Circuit Breakers: Principle & Types | Electrical Engineering

In this article we will discuss about:- 1. Principle of Arc Extinction in Air-Blast Circuit Breakers 2. Types of Air-Blast Circuit Breakers 3. Features 4. Drawbacks. Principle of Arc Extinction in Air-Blast Circuit Breakers: The air-blast circuit breaker requires an auxiliary compressed air system which supplies air to the breaker air receiver. When opening is required, compressed air is admitted [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Air-Blast Circuit Breakers|Comments Off on Air-Blast Circuit Breakers: Principle & Types | Electrical Engineering

Circuit Breakers: Operating Principle and Ratings | Devices | Electricity

In this article we will discuss about:- 1. Meaning of Circuit Breakers 2. Operating Principle of Circuit Breakers 3. Arc Phenomena 4. Arc Extinction 5. Resistance Switching 6. Ratings. Meaning of Circuit Breakers: Circuit breakers are mechanical devices designed to close or open contact members, thus closing or opening of an electrical circuit under normal or abnormal conditions. Automatic circuit [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Circuit Breakers: Operating Principle and Ratings | Devices | Electricity

Arc Extinction in Circuit Breakers: 2 Methods | Electrical Engineering

There are two methods of arc extinction in circuit breakers. They are: 1. High Resistance Method 2. Low Resistance or Current Zero Interruption. 1. High Resistance Method: In this case the arc is controlled in such a way that its effective resistance increases with the time so that the current is reduced to such a value that the heat produced [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Arc Extinction in Circuit Breakers: 2 Methods | Electrical Engineering

Duties of Circuit Breakers: Top 5 Duties | Electrical Engineering

The circuit breakers may be subjected to widely varying stresses under different operating conditions. The current may vary from a few amperes due to no-load magnetizing current of a transformer to the heaviest short-circuit currents amounting to a hundred kilo-amperes. The circuit impedance may also change within the first 10ā€“4 to 10ā€“3 second because open lines or cables connected to [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Duties of Circuit Breakers: Top 5 Duties | Electrical Engineering

Re-Striking Voltage Transient in Circuit Breakers | Electrical Engineering

In this article we will discus about:- 1. Introduction to Re-Striking Voltage Transient 2. Expression for Re-Striking Voltage Transient 3. Classification 4. Characteristics 5. Factors Affecting. Introduction to Re-Striking Voltage Transient: Electrically a power system is an oscillatory network so that it is logical to expect that the interruption of fault current will give rise to a transient whose frequency [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Re-Striking Voltage Transient in Circuit Breakers | Electrical Engineering

Classification of Circuit Breakers | Devices | Electrical Engineering

There are several methods of classification of circuit breakers. On the basis of type of current they may be classified as ac circuit breakers and dc circuit breakers. AC circuit breakers may be classified on the basis of rated voltages. Circuit breakers below rated voltage of 1,000 V are known as the low-voltage circuit breakers and above 1,000 V are [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Classification of Circuit Breakers | Devices | Electrical Engineering

Circuit Breakers: Operation and Mounting | Devices | Electrical Engineering

In this article we will discuss about operation and mounting of circuit breaker. Operation of Circuit Breaker: Each circuit breaker is provided with an operating mechanism. The functions of this mechanism are: (i) To close the breaker contacts rapidly without hesitation at all currents from zero to rated making current capacity (ii) To hold the breaker contacts together against the [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Circuit Breakers: Operation and Mounting | Devices | Electrical Engineering

Conventional Circuit Breakers: Merits and Demerits | Electrical Engineering

Relative merits and demerits of different types of conventional circuit breakers (bulk-oil circuit breakers, minimum oil circuit breakers and air-blast circuit breakers) are given below: 1. Bulk-Oil Circuit Breakers: Merits: Simplicity in construction, high rupturing capacity, suitability for automatic as well as manual operation; possibility of locating CTs in bushings. Demerits: Larger size and greater weight, fire hazard, explosion hazard, [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on Conventional Circuit Breakers: Merits and Demerits | Electrical Engineering

List of Air-Break Circuit Breakers | Devices | Electrical Engineering

Here is a list of air-break circuit breakers: 1. Plain Break Type Air-Break Circuit Breaker 2. Magnetic Blow-Out Type Air-Break Circuit Breaker 3. Arc-Chute Air-Break Circuit Breaker. 1. Plain Break Type Air-Break Circuit Breaker: Plain break type air-break circuit breaker is the simplest one in which contacts is made in the shape of two horns. The air initially strikes across [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Circuit Breakers|Comments Off on List of Air-Break Circuit Breakers | Devices | Electrical Engineering

Sulphur Hexafluoride Circuit Breakers: Construction & Problems | Electricity

In this article we will discuss about:- 1. Construction of SF6 Circuit Breakers 2. Properties of Sulphur Hexafluoride Gas 3. Arc Extinction 4. Advantages 5. Problems Associated. Contents: Construction of SF6 Circuit Breakers Properties of Sulphur Hexafluoride Gas Arc Extinction in SF6 Circuit Breakers Advantages of SF6 Circuit Breakers Problems Associated With SF6 Circuit Breakers 1. Construction of SF6 Circuit [...]

By |2018-03-07T08:16:33+05:30March 7, 2018|Sulphur Hexafluoride Circuit Breakers|Comments Off on Sulphur Hexafluoride Circuit Breakers: Construction & Problems | Electricity
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