Switchgear and Protection

How to check Fault record in ABB REF615 Numerical relay

How to check Fault Record in ABB REF615 Numerical Relay | Overcurrent/Earthfault Relay #relay

Let's understand Name plate of CT. In this video I have explained specification of CT in simple way.

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Let's understand Name plate of CT | Specification of CT | Live tank & Dead tank CT Current transformer is very important equipment for protection.In this video i have explained name plate of CT. In Name plate of CT Various parameters define...

400kV GIS Substation

400kV Gas Insulated Substation(GIS) GIS - Gas Insulated Substation, Which means clearance between equipment are provided by SF6 gas.GIS are very compact and require less maintanance also it req...

Presenting some practical stuff on three phase induction motor. In which i have explained some practical aspects of three phase induction motor from datasheet.

I have also draw torque-slip characteristics of motor from datasheet. Hope you like it...

Three Phase induction motor Datasheet study, Torque slip characteristics In this video i explained datasheet of motor. How we can analyze different parameters from datasheet. At the end i have explained torque slip characteristic...

Overview of generator protection in power plant.

Hello,

This is ACSR Moose conductor used in transmission line. It is used in HV line(220kV).

Moose Conductor as a material for electrical conductors has greatly developed mainly due to its electrical properties. However, Aluminum conductors for most of transmission lines which spans are quite long, it is necessary an additional mechanical support. ACSR stands for aluminum conductor steel reinforced so galvanized steel wires used for cores of ACSR moose conductor.

The inner core of ACSR moose conductor is stranded steel, which provide high tensile strength to conductor. And the external aluminum is light. That means the ACSR moose conductor can cover a long span with less support. So if the overhead wire needs to cross the river and valley, many people will think of ACSR moose firstly.

Specification below image is read as follows.

51 represent no. of aluminum in conductor. 7 represent no. of steel in conductor and 3.53mm represent diameter of both.

When the ACSR moose conductor are working, the current rating is 763 A.

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Thanks.

400kV GIS CT.

400kV GIS CT. #substation #gis #electrical #sf6 #switchgear #gas #insulated #engineering #testing #commissioning

66kV XLPE underground cable.

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Facts - In no load condition, motor absorb lagging var from system to produce RMF so power factor of motor in no load condition is very poor.

Phasor shows No load condition of Induction motor.
You can see current lags voltage by 87 degree.
In this case power factor is 0.05.

This Phasor is measured by Schneider make SEPAM series relay.

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Cheers for those who's answer was diode unit.

It is connected like (Swipe left for drawing....)

Why diode is used??

In drawing you can see that 220V DC converted into 24V DC by DC/DC Converter (Step down chopper/Buck converter). Both chopper supply common 24V dc common bus. Assume MCB at both side of DC/DC Converter.

Assume anything wrong occur in 2nd DC/DC Converter(may be it is short circuit or component failure). Both are in parallel and feed to common bus So if diode not present than your healthy Converter feed to that faulty converter and it may become faulty.

So to prevent it if we connect diode like this manner than your healthy converter cannot supply to other converter as diode came into picture with reverse bias.

Hope you learn something...

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https://partrical.blogspot.com/2019/10/significance-of-trip-circuit.html

Significance of Trip Circuit Supervision relay A blog about Power System Protection