Oil / Winding Temperature Indicator

SCIENTIFIC CONTROLS Mechanical Instruments are incorporates proven design features acquired from many years of experience in providing Temperature Indicators/Controllers for Power & Distribution Transformers.

Oil Temperature Indicator, Winding Temperature Indicator, Power TransformerOil Temperature Indicator : The Oil Temperature Indicator (OTI) measures the Top oil Temperature. It is used for control and protection for all transformers.

Winding Temperature Indicator : The Winding is the component with highest temperature within the transformer and, above all, the one subject to the fastest temperature increase as the load increases. Thus to have total control of the temperature parameter within transformer, the temperature of the winding as well as top oil, must be measured. An indirect system is used to measure winding temperature, since it is dangerous to place a sensor close to winding due to the high voltage. The indirect measurement is done by means of a Built-in Thermal Image.

Winding Temperature Indicator is equipped with a specially designed Heater which is placed around the operating bellows through which passes a current proportional to the current passing through the transformer winding subject to a given load. Winding Temperature is measured by connecting the CT Secondary of the Transformer through a shunt resistor inside the Winding Temperature Indicator to the Heater Coil around the operating Bellows. It is possible to adjust gradient by means of Shunt Resistor.

In this way the value of the winding temperature indicated by the instrument will be equal to the one planned by the transformer manufacturer for a given transformer load.

Click on the products below to view the details.

1. Mercury Switch Type Oil Temperature Indicators (OTI) / Winding Temperature Indicators (WTI) instruments.

Model No. : 2002 | Model No. : 2003

Model No. : 2002

This is a high performance micro switch instrument with +/- 2°C accuracy. capable of temperature monitoring, indication & control, for the protection of Transformers from 1 MVA to 10 MVA rating.

Technical Data
Dial Diameter : 118 mm Segment Dial
Angular Sweep : 60°
Range : 0-120°C, 0-150°C, 20-140°C & 30-150°C
Accuracy : +/-2°C
Graduations : 2°C per division

Electrical Connections
All line to body(Earth) High Voltage Breakdown Tested
: 2.5 KV AC, 50Hz for 60 seconds
Terminal Type : WAGO Terminals Press Fit Type
Switch Configurations
Max.No. of Switches
: 4
Switch Type : Dry electrode mercury in glass
Switch Rating : 5A AC/DC at 250V
Switches : Normally Open Type
Adjustable Range : 10-90% of Full Scale Range
Switch Differential : 6-90°C (Close to Open & Vice Versa)
Switch Accuracy : +/-2.5°C of Set Value
Instrument Case : Weatherproof pressure die-cast Aluminum Alloy Casting with epoxy coated tall sides. Protective Class IP55 as per IS 13947 Part II.
Capillary Entry : Bottom or Top of the case
Cap. Length : Up to 15 Meters
Cap. Tubing : Capillary line protected by flexible Stainless Steel Armour and additional Stainless Steel Armour to reinforce at the entry to the case.
Standard Fittings : 1. Switch Testing Knob
2. Resettable Maximum Pointer
3. Anti-Vibration Mounting Grommets (for Projection Mounting)

Model No. : 2003

Mercury switch type oil temperature indicator (OTI)/ winding temperature indicators (WTI)

This is a high performance, precision mercury switch instrument with +/- 2.5°C accuracy, capable of temperature monitoring, indication & control, for the protection of Transformers from 5 MVA rating.

Technical Data
Dial Diameter : 150 mm (6") Round Type
Angular Sweep : 270°
Range : 0-150°C
Accuracy : +/-2.5°C
Graduations : 2°C per division

Electrical Connections :
Cable Conductor Size
: 1 sq. mm.
Oil Temperature : 4 Core Copper Cable for Switch Connections (Length as per Customer Requirement)
Winding Temperature Indicator
: 4 Core for Switch connections and 2 Core Copper Cable for CT Connection (Length as per Customer Requirement)
All Line to Body (Earth) High Voltage Breakdown Tested
: 2.5 KV AC, 50Hz. for 60 Seconds
     
Switch Configurations :
Maximum Number of Switches
: 2
Switch Type : Heavy Duty Dry Electrode Mercury in Glass
Switch Rating : 2A AC/DC at 250V ± 10%
Switches : Normally Open Type
Adjustable Range : 10-90% of Full Scale Range
Switch Differential : 8°C Fixed
Switch Accuracy : +/-2.5°C of Set Value
Contact Type : Switch Contacts are Potential Free
Instrument Case :

Weatherproof Aluminum Alloy Casting with epoxy coated at all sides. Suitable for outdoor mounting - Protective Class IP55 as per IS 13947 Part II.

Capillary Entry : Bottom or Top of the case
Cap. Length : Up to 6 Meters
Cap. Material : Capillary line protected by flexible Stainless Steel Armour
     
Standard Fittings : 1. Switch Testing Knob
2. Resettable Maximum Pointer
3. Anti-Vibration Mounting

 

2. Micro Switch Type Oil Temperature Indicators (OTI) / Winding Temperature Indicators (WTI) instruments.

Model No. : 2007 | Model No. : 2031

Model No. : 2007

Micro Switch Type Oil Temperature Indicators

This is a high performance instrument with +/- 2°C accuracy. capable of temperature monitoring, indication & control, for the protection of Transformers from 1 MVA to 10 MVA rating.

Technical Data
Dial Diameter : 118 mm Segment Dial
Angular Sweep : 60°
Range : 0-120°C, 0-150°C, 20-140°C & 30-150°C
Accuracy : +/-2°C
Graduations : 2°C per division

Electrical Connections
All line to body(Earth) High Voltage Breakdown Tested : 2.5 KV AC, 50Hz for 60 seconds
Terminal Type : WAGO Terminals Press Fit Type
Switch Configurations :
Maximum Number of Switches : 4
Switch Type : Heavy Duty Micro Switch
Switch Rating : 5A at 240V ± 10% AC & 0.5 A at 220 V ± 10% DC
Switches : Normally Open Type
Adjustable Range : 10-90% of Full Scale Range
Switch Differential : 5°C Fixed
Switch Accuracy : +/-2.5°C of Set Value
Contact Type : Switch Contacts are Potential Free
Instrument Case :

Weatherproof pressure die-cast Aluminum Alloy Casting with epoxy coated tall sides.
Protective Class IP55 as per IS 13947 Part II.

Capillary Entry : Bottom or Top of the case
Cap. Length : Up to 15 Meters
Cap. Tubing :
Capillary line protected by flexible Stainless Steel Armour and additional Stainless Steel Armour to reinforce at the entry to the case.
     
Standard Fittings : 1. Resettable Maximum Pointer
2. Anti-Vibration Mounting Grommets (for Projection Mounting)

Model No. : 2031

Micro switch type oil temperature indicator (OTI)/ winding temperature indicators (WTI)

This is a high performance, precision micro switch instrument with +/- 2.50C accuracy, capable of temperature monitoring, indication & control, for the protection of Transformers from 5 MVA rating.

Technical Data :
Dial Diameter : 150 mm Segment Dial
Angular Sweep : 60°
Range : 0-150°C
Accuracy : +/-2.5°C
Graduations : 2°C per division

Electrical Connections :
Cable Conductor Size : 1 sq. mm.
Oil Temperature : 4 Core Copper Cable for Switch Connections (Length as per Customer Requirement)
Winding Temperature Indicator
: 4 Core for Switch connections and 2 Core Copper Cable for CT Connection Length as per Customer Requirement)
All Line to Body (Earth) High Voltage Breakdown Tested
: 2.5 KV AC, 50Hz. for 60 Seconds
     
Switch Configurations :
Maximum Number of Switches
: 2
Switch Type : Heavy Duty Micro Switch
Switch Rating : 5A at 240V ± 10% AC & 0.5 A at 220 V ± 10% DC
Switches : Normally Open Type
Adjustable Range : 10-90% of Full Scale Range
Switch Differential : 5°C Fixed
Switch Accuracy : +/-2.5°C of Set Value
Contact Type : Switch Contacts are Potential Free
Instrument Case :

Weatherproof Aluminum Alloy Casting with epoxy coated at all sides. Suitable for outdoor mounting - Protective Class IP55 as per IS 13947 Part II.

Capillary Entry : Bottom or Top of the case
Cap. Length : Up to 6 Meters
Cap. Material : Capillary line protected by flexible Stainless Steel Armour
     
Standard Fittings : 1. Resettable Maximum Pointer
2. Anti-Vibration Mounting.