Answer / ritesh

actually setting of over load relay depends on the duty of
motor.if duty of motor is 2 then set relay at full load
current.if it is 2.1 then set relay at 10% higher then full
load current so on...........

Answer / rupali burnwal

125% of the motor full load current require for Overload relay.

Answer / bijay

RELAY SETTING REQUIRES TWO THINGS CURRENT AND TIME
CURRENT SETTING CAN BE UP TO 20 TO 30 % FOR SMALL MOTORS
AND UPTO 10% IN MV MOTORS.
BUT DONT FORGET FOR MUCH TIME U R OVERLOADINIG THE MOTOR.
TIME SETTING IS ALSO IMPORTANT...
THIS DETERIORATES ITS INSULATION

Answer / exxon

Is it safer to find out the spec about the motor winding
before deciding the overload relay settings. Every motor
manufacture has detailed spec. about is motor winding such
as insulation class:. Overloading the motor full load
current will deteriorates the insulation and winding life.

Answer / sanjy

10-15% of its rated current rating.

Answer / suresh

set the overload setting standerd draw currents 10% extra
but less than rated current

what is the formula for calculating the phase clerance between two phases and phase to earth how to calculate the cable for a motor

0 Answers  

how to reduce the initial starting amps which is equal to the running load amps

3 Answers  

In the Variable Voltage Variable Frequency Drive, how the Voltage and Frequency varied ? Is it varied in the Inverter part of the Drive ? Please give us supporting document if any.

0 Answers  

inductance and capacitance may result in periodic reversals of the direction of energy flow,how???

1 Answers  

How to do the REF Stability test for power transformers in Site?

1 Answers   Escorts, Siemens,

the power loss in an overloaded line is mainly due to? a. resistance b. capacitance d. inductance d. none

4 Answers  

How DC to AC convert

2 Answers   Access,

Which is capital of Indian State Tripura ?

13 Answers   RRB,

how to calculate induction motor rating (HP) if name plate is missing from motor at site condition ?

6 Answers   ABB, apatel, Bhel, Spatel, Voltas,

How to increase home power factor? Can we connect capacitor directly? How to select capacity of capacitor?

5 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?

0 Answers   Siemens,

What is ELR, and where it is used ?

7 Answers   KSEB,