SGP318 Mho Relay
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- เผยแพร่เมื่อ 17 ต.ค. 2024
- Lectures on Switchgear & Protection By Dr. Tirupathiraju Kanumuri, Assistant Professor, NIT Delhi
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MHO (Modified High-Impedance) type distance relay is a protective relay widely used in power systems to detect faults, such as short circuits or ground faults, and provide accurate and fast fault location information. Here is an overview of how MHO type distance relay works:
1. Voltage and Current Measurement: The MHO relay continuously measures the voltage and current signals at a specific location in the power system. This is done using voltage and current transformers that provide the relay with scaled-down representations of the system voltage and current.
2. Impedance Calculation: The MHO relay calculates the impedance seen at its location by dividing the measured voltage by the measured current. This impedance represents the distance between the relay and the fault.
3. Zone Settings: The MHO relay is configured with a set of zone settings, typically expressed as impedance characteristics. These zone settings define the permissible impedance range for the relay to operate within. For example, a Zone 1 setting may be intended to protect the closest section of the power system, while a Zone 2 setting may cover a larger area.
4. Comparison and Decision Making: The calculated impedance is compared with the pre-configured zone settings. If the calculated impedance falls within one of the defined zones, the relay initiates a trip signal to disconnect the faulty section of the power system.
5. Operation Time: The operation time of the MHO relay depends on the distance of the fault from the relay location. More accurate distance measurements are achieved by adjusting the characteristic curves and settings of the relay.
6. Communication: In larger power systems, MHO relays are often integrated into a wider protection scheme with communication capabilities. This enables relays in different locations to exchange fault information and make coordinated decisions. Such schemes improve the overall protection and reliability of the power system.
Overall, MHO type distance relays work by continuously measuring voltage and current, calculating the impedance, comparing it with the pre-set zone settings, and initiating a trip signal if the impedance falls within the designated zones. The relay's accuracy and speed in fault detection help in reducing downtime and ensuring the safety and reliability of the power system.
sir you really deserve this profession
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happy teachers day sir..
sir why did u not take circle diagram of R-X in reactance relay while explaining arc resistance effect?
Discuss how effect of arc resistance on performance of impedance relay may be overcome by using mho relay..... Plz help sir
sir please, if the Mho Relay has the directional element, does it mean that, the connections from the line to the potential transformer and current transformer is such that, the system current is also made to lead the voltage by suitable connections just as we saw in the directional overcurrent relay?
2. Would the same connections be done with Impedance relay and Reactance Relay?
@@lecturesinelectricaleng thanks
but is your answer for both question 1 and 2...meaning all three distance relays, are connected with the system current leading the voltage
Dear sir.
1. Can you please confirm, if K1, K2 and K3 are constants? If they are constants then please help me understand, how the ratio of K3 and K2 i.e Zset is in ohms?
2. Practically, how the values of K3 and K2 are changed to get the desired setting in EM relays?
Regards.
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Pls explain offset mho relay. I didn't find anywhere. It will be so helpful if u explain this topic.thank u sir
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Fault line characteristics mean what sir
Sir during explanation of effect of arc resistance.....you mentioned that OA is Zset ..... But we are adding Arc Resistance to it so it should be Fault characteristics I think....... please confirm.
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Dear sir
I would like a humble request to guide me to which book shall I use to understand electromechanical mho relay characteristics which could give an easy understanding of torque development and calculation for the same. And what value of the capacitor and inductor coil to be chosen for the polarising quantity and all. I would like to go in depth understanding of the same. Author paithankar just gives a brief of the same. Other paithankar could you just some book sir
Hope this comment is taken into consideration and a favorable reply will be given
@@lecturesinelectricaleng sir shall I send you walter a Elmore book and a r van c warrington book? If you could give a detailed explanation it would be helpful
A detailed video I meant sir
Sir suggest the book name for this subject
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sir pickup current & plug setting multiplier.
do u have vido?
thank you sir
Why fault line characteristics are straight line
Impedance of line per km is called characteristic impedance of line. Total impedance upto fault is characteristic impedance multiplied by distance in km upto fault. Slope of line is characteristic impedance
Sir plz .. do more vedios on electrical machines
Pls explain how to draw offset mho relay
Sir I'm not finding the textbook. But it's there in the jntuk syllabus.
2 adds before vedio .... testing the patience
Thank you so much sir
@@lecturesinelectricaleng
Sir will you teach control system also
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