What is the operational principle of direct current current transformer and direct current potential transformer?if possible plz reply with ckt. diagram.

1 Answers  

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how does a current carrying conductor posess a magnetic field. what is the reason for the production of electro magnetic field around the conductor

2 Answers   Vizag Steel,

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Why current transformer is earthed??

2 Answers  

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what is vector surge & vector shift? we have 25.3 MW(11kv) generator & 11kv/132kv transformer, connected with with 132 kv grid.vector surge relay is tripping frequentaly.what is permissible maximum limit for this.

3 Answers  

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when neutral will carry the current?what could be the magnitude?

7 Answers   Voltas,

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What is on line ups and off line ups?

2 Answers  

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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?

0 Answers   Siemens,

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why armature is placed in stator but not in rotor in synchronous generator ?

2 Answers   Student,

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Fantio of tranformer

0 Answers   Tenon,

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By just seeing a transmission tower, how can we knew the voltage it carries..?[110kv, 220kv, 400kv...]???

5 Answers   KSEB,

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What do you mean by phasors?

0 Answers  

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how to reduce earth to neutral voltage?

8 Answers   Field Gun Factory,

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