Directional over current Protection | Cross polarized directional over current protection

Cross polarized directional over current protection
self polarized directional over current protection
• Directional over curre...

[@kumereshan]

Thank u barani ji

[@baranitech1026]

WELCOME

[@user-bouhamida08]

Merci pour votre excellent explication simple et non compliquée

[@baranitech1026]

welcome

[@balajikrish5842]

Excellent explanation

[@baranitech1026]

thank you

[@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)

[@baranitech1026]

each relay has its own programing code and finding method.

[@SantoshKumar-nk5ve]

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

[@baranitech1026]

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

[@ammarhassan2288]

Shabash

[@baranitech1026]

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

[@baranitech1026]

sure

[@hitmancaptaincool4073]

Thank you sir

[@baranitech1026]

most welcome

[@zaynardilez7139]

What is the suitable RCA for DGR Relay ??

[@baranitech1026]

i don't know

[@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 ??

[@baranitech1026]

Yes, correct

[@channabasavaraj9817]

why it is taken like this sir?

[@ramkumarchakkaravarthy4170]

If RCA is negative then how we should take

[@baranitech1026]

we have to take Vref should be opposite

[@chatmongkhonratchawong6045]

It phase between 90 angle

[@baranitech1026]

phase between 90 angle ?

[@chatmongkhonratchawong6045]

@@baranitech1026 it the phase angle beetween A-B B-C C-A

[@baranitech1026]

@@chatmongkhonratchawong6045 yes

[@user-sv3uk7my7r]

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?

[@baranitech1026]

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.