What is carrier current protection?
Table of Contents
What is carrier current protection?
Carrier current protection is the most widely used scheme for the protection of Extra High Voltage (EHV) and Ultra High Voltage (UHV) power lines. The carrier signal is directly coupled to the power line itself which his to be protected.
Which component is used in carrier current protection?
The main elements of the carrier current protection are: Transmitter, Receiver, Coupling equipment and Line trap.
What is the main purpose for using carrier current protection?
Carrier current protection scheme is mainly used for the protection of the long transmission line. In the carrier, current protection schemes, the phase angle of the current at the two phases of the line are compared instead of the actual current.
What is the carrier tripping scheme?
When a carrier signal is used to initiate tripping of relay, the scheme is known as carrier inter- tripping, or transfer tripping or permissive tripping scheme. The scheme is known as carrier-blocking scheme when the carrier signals are used to prevent the operation of a relay.
What is 3 zone distance relay?
Traditionally, three-zone protection schemes are used to locate and to island faulty section from the line. During the outage of one of the transmission lines, overloading condition may arise which may cause maloperation of the distance relay employed in the scheme.
What is Mho characteristic?
Dynamic Characteristic The dynamic characteristic of the mho relay with memory action is the result of the delay (in the memory circuit) of the phase shift of the polarizing voltage from the prefault to the fault condition.
What is meant by Mho relay?
A mho Relay is a high-speed relay and is also known as the admittance relay. In this relay operating torque is obtained by the volt-amperes element and the controlling element is developed due to the voltage element. It means a mho relay is a voltage controlled directional relay.
What is the function of Buchholz relay?
A typical Buchholz relay will have two sets of contacts. One is arranged to operate for slow accumulations of gas, the other for bulk displacement of oil in the event of a heavy internal fault. An alarm is generated for the former, but the latter is usually direct-wired to the circuit breaker trip relay.
Where is Mho relay used?
Mho distance relays are widely used for the protection of uncompensated and series compensated transmission lines in order to determine the presence and location of faults.
What is the application of mho relay?
The applications of the Mho relay are listed below. It is used to protect long transmission lines because of its power swings. It is used to protect series compensated and uncompensated transmission lines to determine the location of the faults.
Which oil is used in transformer?
Mineral oil and Synthetic oil are the majorly used transformer oil. These are the petroleum products, like Naphthenic based transformer oil and Paraffinic based transformer oil.
Which gas is used in Buchholz relay?
Buchholz Relay Working Principle Whenever there will be a minor internal fault in the transformer such as an insulation fault between turns, break down of core of the transformer, core heating, the insulating transformer oil will be decomposed in different hydrocarbon gases, CO2 and CO.
