ABB REM620 Thermal Overload Function Test Reset Problem 2

[rayas91]

Hi friends ,

I m relay engineer. I m at substation now. During testing thermal overload test , I couldnt reset the thermal degree...Waiting to be zero ( degree) takes much time .

I disabled the function but still same..I just want to test from zero.

Rated Current : 1,00
Initial thermal val : 74 %

Setting Group 1 :

Overload Factor : 1,05
Alarm thermal value : 85 %
Restart thermal value : 40 %
Negative Seq Factor : 0
Weighting factor : 50 %
Time constant normal : 320 s
Time constant start : 320 s
Time constant stop : 500 s
Env temperature mode : FLC only
Env tepmperature Set : 40 C


Thanks

 

[JG2828]

Page 343 of the technical manual says:

The time to lockout release is calculated, that is, the calculation of the cooling time to a
set value. The calculated temperature can be reset to its initial value (the Initial
temperature setting) via a control parameter that is located under the clear menu. This
is useful during testing when secondary injected current has given a calculated false
temperature level.​

So, first you need to change your "Initial thermal val" setting to 0 and save. Then you need to push the clear button on the relay, scroll down to the proper setting and clear it.

https://library.e.abb.com/public/3fed1ac90f340a76c1257ab7002230fd/RE_620ANSI_tech_504801_ENa.pdf

 

[rayas91]

Thank you for your answer...

I read the manual ..I think I coulndt see that point.

Again thanks much

 

[rayas91]

" JG2828 " , by the way I checked the manual ,There s calculation of trip time.

toperate= -T . In [( Qfinal-Qoperate)/(Qfinal/Qn)]

Is it possible to use that calculation for my function ( MPTTR ) ? And dont understand ( Qfinal and Qn )
IF isnt , do you know the calculation ?

Thanks

 

[JG2828]

rayas91,
I don't have an answer to that one. Hopefully someone else can chime in.

Thanks.

 

[slavag]

It is some old information about MPTTR function, for REF615.
Hope it is help

https://www.dropbox.com/s/h6h9ksea4for386/MPTTR.rar?dl=0