Answer / saravanakumar

static relays not using any active components.. so it is
smaller in size..

Answer / jagan

Static (Stationary) Relay(Switching device) - Electronics
Switching Devices(Thyristers -SCR, TRIAC and et cetera)

Electro-Magnetic Relay - Relay that contains Core coil and
moving core(E & I Core) stationary contact & Movable
contacts

Another, logic AND, OR, NOT, NOR, Ex-OR

Answer / pramod kumar

Electro magnetic relays r 1st generation relays they use
principle of elecro magnetic principle.they depend apon
gravitation also and the value changes to the surrounding
magnetic fields also.

static relays r 2nd generation relays.In this relays
transistors and IC's r been used. there value may vary wrt
temperature also.

numerical relays are present generation relays. They use
Microprocessor. with in built software and predefined values
if any values extend the predefined values then relay gets on.
by this relay we can find distance of fault also.

Answer / reshi

ELECTROMAGNETIC RELAYS WORKS UNDER THE PRINCIPLE OF
ELECTROMOTIVE FORCE.IT USES MAGNETIC CORE AND PLUNGER FOR
THE SENSING AND ACTIVATION OF THE CIRCUIT.
WHERE AS STATIC RELAY COMPRISES OF ELECTRONOC CIRCITARY AND
USES LOGIC FOR THE SENSING AND ACTIVATION OF THE CIRCUIT.
ADVANTAGES-STSTIC RELAYS ARE LIGHT WEIGHT , RELIABLE AND
THE RESPONSE IS FASTER THAN THE ELECTROMAGNEIC RELAYS.

Answer / gova

Hi

1)static Relay burden is less than Electromagntic type of
relays.Hence error is less.
2)lesser weight
3)Relay overshoot is less

Answer / m.k.bhatnagar

Static relays are low burden, more accurate, low weight, easy testing & having higher range of setting than EM relays. Cost is more than EM relay.

Numerical relays are micro processor based relays and having the features of recording of parameter used as disturbance recorder flexibility of setting & alarms & can be used one relay for all type of protections of one equipment hence less area is required. Wide Range of setting, more accurate, Low burden hence low VA of CT is required which minimize the cost.

Answer / ud

1) static relay is stationary relay while em relay is movable.
2) power consumption in case of static relay is usully lower than em relay.

how to calulate short circuit current for the following: 1.cable connecting 11KV of 22KV/11KV transformer to 11Kv of 11KV/415V transformer 2.what cable size should i use.

0 Answers  

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2 Answers  

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?

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Write the programming software name for LG, SIEMENS,Messung,AB

0 Answers