Micom P634 - Thermal Overload Protection (Function Groups THRM1 and THRM2); Enabling or Disabling Thermal Overload Protection; Readiness of Thermal Overload Protection

3.25 Thermal Overload Protection (Function Groups THRM1 and
THRM2)
The thermal overload protection function has been designed for overload
protection of transformers.
Function group THRM1 will serve as an example to illustrate the operation of the
thermal overload protection functions. Accordingly, the same is valid for function
group THRM2.
3.25.1 Enabling or Disabling Thermal Overload Protection
Thermal overload protection may be enabled or disabled using setting
parameters. Moreover, enabling can be carried out separately for each
parameter subset.
64Z5017A
Parameter
set 1
set 2
set 3
set 4
THRM1:
Enable PSx
081 070
082 070
083 070
084 070
THRM1:
Enabled
[ 039 129 ]
THRM1:
Enable PSx
[ * ]
1
0
0: No
1: Yes
0
0: No
1: Yes
THRM1:
General enable USER
[ 031 144 ]
1
Fig. 3-127: Enabling or disabling thermal overload protection
3.25.2 Readiness of Thermal Overload Protection
Thermal overload protection will issue the THRM1: Not ready signal if one of
the following conditions applies:
●
Thermal overload protection is disabled.
●
Thermal overload protection is blocked because of a fault in the coolant
temperature (ambient) acquisition.
●
Thermal overload protection is blocked because of an incorrect setting.
●
The thermal replica is blocked via an appropriately configured binary signal
input.
P634
3 Operation
3-174 P634/EN M/R-42-A // P634‑311‑653