OIL / WINDING TEMPERATURE INDICATORS ....

View other oil / winding temperature indicators ...

Oil 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.

SALIENT FEATURES :

1. No external power supply required for indication or operation
2. Liquid in metal expansion provides self powered system
3. Fully compensated for ambient temperature changes in line & case
4. Built-in Thermal imaging for transformer 'Hot Spot' temperature indication (in case of WTI)
5. Weather proof case for outdoor services (IP55)
6. Panel mount or Projection mounting (varies with Different Models)
7. Maximum capillary length of 15 mtrs. (varies with Different Models)
8. Up to 4 control switches are available (varies with Different Models)
9. Maximum indicating pointer facility Switch Test Knob facility
10. Remote Indication & Data acquisition facility
11. Sealed system which requires no trimming or periodic site adjustments.

A ) MERCURY SWITCH TYPE OIL TEMPERATURE INDICATORS (OTI) / WINDING TEMPERATURE INDICATORS (WTI) INSTRUMENTS

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 :
Maximum Number 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 :	Switch Testing Knob Resettable Maximum Pointer Anti-Vibration Mounting Grommets (for Projection Mounting)

Model No. : 2003 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 : Switch Testing Knob Resettable Maximum Pointer Anti-Vibration Mounting

B ) MICRO SWITCH TYPE OIL TEMPERATURE INDICATORS (OTI) / WINDING TEMPERATURE INDICATORS (WT) INSTRUMENTS

Model No. : 2004 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 :	Resettable Maximum Pointer Anti-Vibration Mounting Grommets (for Projection Mounting)

Model No. : 2031 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 : Resettable Maximum Pointer Anti-Vibration Mounting.