Directional over current Protection | Cross polarized directional over current protection

[@user-bouhamida08]

Merci pour votre excellent explication simple et non compliquée

[@baranitech]

welcome

[@balajikrish5842]

Excellent explanation

[@baranitech]

thank you

[@palashdas5346]

How to check REF615 relay phasor diagram/vector sum of current

[@baranitech]

triggering on DR and possible to check Thank you.

[@livingstonechando2613]

l have a question in Cross polarization.If the operating current leads the polarizing voltage ,are we not supposed to use negative on RCA settings?

[@baranitech]

need to use reverse direction settings

[@SantoshKumar-nk5ve]

Sir, how we know which one polarization method used in p141 relay for o/c and E/F relay?

[@baranitech]

ITS CROSS POLARIZATION . THIS WE CAN CHECK IN RELAY MANUAL.

[@gurpreetsinghee]

Why some relays use torque angle or MTA for oc 45 lag and ef 15 lead(make avana npa141), but some relays oc 45 lead and ef 15 lag(make erl MIT121-131)

[@baranitech]

each relay has its own programing code and finding method.

[@ammarhassan2288]

Shabash

[@baranitech]

your most welcome

[@ManojkumarSahoo_electrical]

Sir please explain about negative sequence polarization for earth fault protection in transmission line & how to calculate its operating region

[@baranitech]

sure

[@kumereshan]

Thank u barani ji

[@baranitech]

WELCOME

[@zaynardilez7139]

What is the suitable RCA for DGR Relay ??

[@baranitech]

i don't know

[@魏伯-b2i]

How do I test the digital protection relay in the field? 1. After inputting the formal parameters, do you want to test each protection function? 2. After testing with temporary parameters, do I need to test with formal parameters again? 3. After changing the parameter settings, how to ensure that the input is correct? Is it re-testing or visual inspection on the equipment?

[@baranitech]

1. After input to formal parameter testing of all function will be good 2. once if you tested with temporary setting itself okay but for 100% conformation you need to go for testing again once you have your formal parameters.

[@ManojkumarSahoo_electrical]

Hello sir For self polarization the RCA angel is taken in clockwise direction from reference phasors & for cross polarization the RCA angel is taken in anticlockwise direction from reference phasors. Is it correct sir ??

[@baranitech]

Yes, correct

[@channabasavaraj9817]

why it is taken like this sir?

[@ramkumarchakkaravarthy4170]

If RCA is negative then how we should take

[@baranitech]

we have to take Vref should be opposite

[@hitmancaptaincool4073]

Thank you sir

[@baranitech]

most welcome

[@chatmongkhonratchawong6045]

It phase between 90 angle

[@baranitech]

phase between 90 angle ?

[@chatmongkhonratchawong6045]

@@baranitech it the phase angle beetween A-B B-C C-A

[@baranitech]

@@chatmongkhonratchawong6045 yes