Interested to Buy Any Domain ? << Click Here >> for more details...
We use ungrounded DC system (220V/110V) for control and
protection system in substations etc. Suppose we have long
2 core DC cables running from our DCDB in control room to
the load (length of around 2 to 3 km). Do we need to
protect these long DC cables from earth leakages or not? If
yes how?
- 5 Answers
- 11769 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / krishna
Usage of differential relay for 220V/110V is not an
economical idea. Differential protection is the costlier
protection. DC Cables should be protected from earthleakage
bacause of which voltage differences occurs and trips the
circuits due to large variations. I suggest to go for
MCCB/MCB of required rating which trips the circuit when
earth leakage occurs.
| Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
What is Control & Relay Panel? And Remote Control Center?
How to select the cable and voltage drop in circuit?
how can calculation ate Amps for cabel. Ex-for 1sqmm wire hou many amps we can draw
Define maximum demand?
how we can calculate power factor in single phase & three phase ?thank u
hi friends if you have any 400KV Substation Erection and installations Drgs please send to me.My email id:kandi.suresh441@gmail.com
how to select battery for 15 KVA UPS with formula
Why insulation level follows this order? transformer < bus bar < circuit breaker & Isolator < transmission line.
area control error
who many types of fire explane with exmple
WHY IL=IPH IN STAR AND WHY IPH=IL/1.732 IN DELTA? WHAT IS REASON BEHIND IT?
does buccholz in a transformer use batteries
what happens if earth of 33kv cable is not connected to earthing pits? please send this query's answer to ngrm.sudha249@gmail.com
According to IEC60034-14, When the vibration monitoring system required for motor Bearing. above which KW, it is required? and for what type of bearing the vibration probe is provided.
Assuming that a dedicated neutral earthing transformer is provided for each GT generator, when the two generators are running in parallel, has consideration been given that the earth fault current from one generator stator winding be split between the two neutral earthing transformers? If so, what adverse impact will this have on the operation of the 59N and 27TN devices?
