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High Tension Oil Cooled Outdoor Potential Transformers

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DESCRIPTION

Direct measurement of Voltage in high voltage system is not possible because of insulation problem of measuring instruments. It is also not possible to use voltage through the system directly for protection purpose due to its high value & high insulation problem. In such conditions voltage transformers are used.

 

BASIC FUNCTIONS OF VOLTAGE TRANSFORMERS ARE ...
• To reduce the line voltage to a value which is suitable for standard measuring instruments, 
relays etc.
• To isolate the Measuring Instruments, Meters, Relays etc. from high voltage side of an installation.
• To sense abnormalities in Voltage & give Voltage signals to protective relays 
to isolate the defective system.

 

FEATURES

The transformers are oil filled, assembled in M.S.Tanks & Chambers together with suitable Porcelain Bushing. High quality C.R.G.O. Silicon Steel is used in the transformer. High quality kraft & crepe insulating paper is used to build up main insulation. Semiconducting shield is used to give linear distribution of Electrical stress along the length of the bushing. Filtered & de-aerated EHV grade oil is filled in VTs while VT is under vacuum. To seal it, the space left for expansion on the top is filled with dry & pure Nitrogen through non returnable valve at pre-determined pressure.
Design incorporating Stainless Steel Bellows instead of Nitrogen cushioning is also available.

 

ELECTRICAL SPECIFICATIONS
• TYPE Single Pole Insulated & Double Pole Insulated.
• OPERATING VOLTAGE Single Pole Insulated 1 lkV, 22kV, 33kV, 66kV, 11OkV, 132 kV, 220kV.
    Double Pole Insulated llkV, 22kV, 33kV.
• SECONDARY VOLTAGE 110V, 110V~3,,,,,, 110V/ 3 (others on request)
• BURDEN 50VA,100VA,150VA,200VA (others on request)
• ACCURACY 0.2, 0.5, 1.0, 3.0, 3P,6P.
• FREQUENCY 50 Hz.
• OPERATING TEMP. -10°Cto40°C
• SYSTEM CONDITION Earthed, Unearthed.
• CONFORMSTO IEC186,IEC60044-2,IS3156.

 

MECHANICAL CONSTRUCTION
Panel Meter,Transformer,Voltage Regulator/ stabilizer,Rectifier,Transducer,Break down tester,Test Bench,Relay test kit,Energy saver,Test measuring instruments
66kV VT

 

Ordering information
While ordering mention all the Electrical Specification required.

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