Mho-type Distance Relay Research Articles

Modeling and Simulation of Mho Type Distance Relay for High Voltage Transmission Line Protection

Abstract-This paper describes the opportunity of implementing a model of a Mho type distance relay with three zones by using MATLAB/SIMULINK package. SimPowerSystem toolbox was used for detailed modeling of distance relay, transmission line and fault simulation. The proposed model was verified under different tests, such as fault detection which includes single line to ground (SLG) fault, double line fault (LL), double line to ground fault (LLG) and three phase fault, all types of faults were applied at different locations to test this model. The results show that the relay operates correctly under different locations for each fault type. Keywords- Distance relay, Single line to ground fault (L-G), Double line to ground (L-L-G), Line to Line fault (L-L), Three phase fault (L-L-L), MATLAB/SIMULINK.

Modelling and Simulation of Mho Type Distance Relay for High Voltage Transmission Line Protection Using MATLAB Software

Transmission lines are an important part of a power system. Transmission lines have high power transmission capacity and they are prone to faults of larger magnitudes. Various faults occur in transmission lines. Therefore, protection relays are necessary to protect transmission lines. The purpose of protection system is to interrupt the faulty section from the healthy section because the fault currents may damage the electrical equipments. One of the protection relays is distance relay and it is mainly used in transmission line. Sometimes these relay are used for backup protection. Distance relays for determining the impedance need the voltage and current. Transmission lines are typically protected by distance protection relay. Distance relays are considered of high speed class and can provide transmission lines. Nowadays, numerical distance relays have been used instead of using electromechanical and static distance relays. The proposed model was verified under different tests such as single line to ground (L-G) fault, double line to ground (L-L-G) fault, line to line (L-L) fault and three phase (L-L-L) fault. SimPower System was used for modelling and simulation of distance relay, transmission lines and faults. The simulation results were obtained from MATLAB software shows the feasibility of analysis of transmission line protection with mho type distance relay for single line to ground fault, double line to ground fault, line to line fault and three phase fault at different location of transmission lines. The difficulties understanding on operation of distance relay can be cleared by using MATLAB/SIMULINK software.

A new approach of Mho distance relay for Transmission line protection

The protection of transmission line is one of the important requirements of the modern power system network to protect the equipment and persons work on it. distance relay is one of the relays used to protect the transmission line where the input to the fuzzy based distance relay are the resistance and reactance of transmission line from relay to the fault location. These were calculated from the measured voltage and current. Mho type distance relay is proposed by using fuzzy logic methodology to protect the transmission line and to defeat under and over-reach problems. MATLAB-Simulink is used to model the relay and the test network, where the fault type is detected and four zones of fault location are provided, the trip signal is delayed according to the zone number. Also the (R-JX) plain is used to show the zone of fault in a simplified manner.

Development of Mho Type Distance Relay for Protection of Long Transmission Line using Matlab / Simulink Environment

Development of Mho Type Distance Relay for Protection of Long Transmission Line using Matlab / Simulink Environment

The Effect of Subsynchronous Current on a a Static Mho Type Distance Relay

Several large electric utilities in the western United States have installed series capacitors on their transmission systems. With series compensation, currents at subsynchronous frequencies can be generated by faults or system switching. This paper examines the effect of subsynchronous current on a static mho type distance relay.

The Effect of Subsynchronous Current on a Static MHO Type Distance Relay

Several large electric utilities in the western United States have installed series capacitors on their transmission systems. With series compensation, currents at subsynchronous frequencies can be generated by faults or system switching. This paper examines the effect of subsynchronous current on a static mho type distance relay.

Discussion on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors”

Discussion on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors”

The authors' reply to the discussions on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors”

The authors' reply to the discussions on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors”

Discussion on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors” before the North-Eatern Radio and Measurement Group, at Newcastle upon Tyne, 18th March, 1957

Discussion on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors” before the North-Eatern Radio and Measurement Group, at Newcastle upon Tyne, 18th March, 1957

Discussion on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors” before the Supply and Measurement and Control Sections, 30th January, 1957

Discussion on “Power system protection, with particular reference to the application of junction transistors to distance relays” and “A dual-comparator mho-type distance relay utilizing transistors” before the Supply and Measurement and Control Sections, 30th January, 1957

A dual-comparator mho-type distance relay utilizing transistors

The paper describes further work on a mho-type relay using transistors, which depends for its operation on direct phase-comparison. The relay is rendered free from transient overreach by the use of a dual comparator circuit configuration. Relay accuracy is discussed and the methods which have been employed to improve the accuracy of the relay during operation without increasing its sensitivity are described.The tests applied to the relay and the reasons for their adoption are given briefly. Accuracy/range charts and dynamic mho-curves are presented for the relay connected as a phase-fault element with normal polarization, with polarization from an unfaulted phase and with the use of memory.It is concluded that the relay is a marked improvement over proto-types described earlier by the authors, particularly in respect of accuracy and absence of transient overreach. Speed of operation is discussed, with particular regard to the use of an alternative criterion of operation in which only one of the two comparators must detect a fault before a tripping signal is produced.Probable improvements in the relay design with a view to economy in the number of transistors are considered. No transistor failures have been experienced.