Siemens SIPROTEC 4 7UT6 Series User Manual

Table 2-9 Thermal characteristics of power transformers
Cooling method:
Distribution
transformers
Medium and large power
transformers
ON..
ON.. OF.. OD..
Winding exponent Y 1.6 1.8 1.8 2.0
Insulation temperature gradient H
gr
23 26 22 29
Additional Thermal Overload Protection Function
In the aforementioned description, the first thermal overload protection is described respectively. The differ-
ences in the parameter addresses and message numbers of the first and second thermal overload protection
are illustrated in the following table. The positions marked by x are identical.
Parameter
addresses
Message no.
1. thermal overload protection function 42xx 044.xxxx(.01)
2. thermal overload protection function 44xx 204.xxxx(.01)
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
Addr. Parameter Setting Options Default Setting Comments
4201 THERM. OVERLOAD OFF
ON
Block relay
Alarm Only
OFF Thermal Overload Protection
4202 K-FACTOR 0.10 .. 4.00 1.10 K-Factor
4203 TIME CONSTANT 1.0 .. 999.9 min 100.0 min Thermal Time Constant
4204 Θ ALARM 50 .. 100 % 90 % Thermal Alarm Stage
4205 I ALARM 0.10 .. 4.00 I/InS 1.00 I/InS Current Overload Alarm Setpoint
4207A Kτ-FACTOR 1.0 .. 10.0 1.0 Kt-FACTOR when motor stops
4208A T EMERGENCY 10 .. 15000 sec 100 sec Emergency Time
4209A I MOTOR START 0.60 .. 10.00 I/InS; ∞ ∞ I/InS Current Pickup Value of Motor
Starting
4210 TEMPSENSOR RTD 1 .. 6 1 Temperature sensor connected to
RTD
4211 TEMPSENSOR RTD 1 .. 12 1 Temperature sensor connected to
RTD
4212 TEMP. RISE I 40 .. 200 °C 100 °C Temperature Rise at Rated Sec.
Curr.
4213 TEMP. RISE I 104 .. 392 °F 212 °F Temperature Rise at Rated Sec.
Curr.
4220 OIL-DET. RTD 1 .. 6 1 Oil-Detector conected at RTD
4221 OIL Sensor RTD 1 .. 12 1 Oil sensor connected to RTD
4222 HOT SPOT ST. 1 98 .. 140 °C 98 °C Hot Spot Temperature Stage 1
Pickup
4223 HOT SPOT ST. 1 208 .. 284 °F 208 °F Hot Spot Temperature Stage 1
Pickup
4224 HOT SPOT ST. 2 98 .. 140 °C 108 °C Hot Spot Temperature Stage 2
Pickup
2.9.6
Functions
2.9 Thermal Overload Protection
SIPROTEC 4, 7UT6x, Manual 209
C53000-G1176-C230-5, Edition 09.2016

Siemens SIPROTEC 4 7UT6 Series Specifications

General

Brand	Siemens
Model	SIPROTEC 4 7UT6 Series
Category	Protection Device
Language	English