What is PIR (pre
inserting resistance)
in 400kv EHV SF6
BREAKER? Why it use?
- 1 Answers
- 9938 Views
- Adani, I also Faced
- E-Mail Answers
Answer Posted / j.karthik(cce)
PIR means Pre insertion resistor... This PIR is connects
parallel to the main interruptor..This is used to limit the
current to be interrupted.
| Is This Answer Correct ? | 12 Yes | 5 No |
Post New Answer View All Answers
Draw the vector diagramme for Asynchronous Induction Generator at noload,half load and fullload.
hi frenz,its aswathy.i hve aplied for the hpcl test on feb,pls send the test patern & the placement papers as soon as possible. mail-id :kjaswathy@gmail.com
what is the meaning of number in (11, 31, 61,14, etc. CDG11, CDG31, CDG61, DDT32
what kvrah y we need to take the readind of that
We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
What are root loci?
What is the Current equation in series RLC circuits.
what is the step by step formula for calculating bus bar phase and neutral size of a panel board.suppose the incomer of panel board is 100A..???step by step answer please
what is the criterion for selecting vector group of Transformers ? i mean how to decide vector group of Generator transformer, substation trasformer and transformer at consumer end
why the check zone and main zone are used for Busbar Protn. scheem?
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
how r charge carriers produced
how to calculate the earth mat design in 132 kv substation yard ????
how to determine motor size for a fan application?
What is effect of harmonic current (Draw by VFD) on power system/ electrical Equipments ?
