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High Tension Oil Cooled Outdoor Current Transformers

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DESCRIPTION

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

 

BASIC FUNCTIONS OF CURRENT TRANSFORMERS ARE ...
• To reduce the line current 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 protect Measuring Instruments against short circuit currents.
• To sense abnormalities in current & give current 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 crepe insulating paper is used to build up main insulation. Semiconducting shield is used to give linear distribution of Electric stress along the length of the bushing. Filtered & de-aerated EHV grade oil is filled in CTs while CT is under vaccum. 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.

 

ELECTRICAL SPECIFICATIONS
• TYPE Live or Dead Tank
• OPERATING VOLTAGE 11kV, 22kV, 33kV, 66kV, 110kV, 132 kV, 220kV, 400 kV.
• PRIMARY CURRENT Upto 2500 Amps.
• SECONDARY CURRENT 5A & 1A (Others on request).
• SHORT TIME THERMAL CURRENT
& ITS DURATION		 Upto 40kA for 1 second (Others on request).
• RATED BURDEN 5,10,15,20, 30VA (Others on request)
• ACCURACY CLASS 0.2, 0.5, 1 .0, 5P10, 5P15 (Others on request)
(For differential protection, REF protection, Bus Bar
protection, CT with accuracy class PS can be offered.)
• FREQUENCY 50Hz.
• OPERATING TEMP. -10°C to 40°C
• CONFORMS TO IEC -185 / IEC - 44 -1 / IS - 2705.

 

MECHANICAL CONSTRUCTION
Panel Meter,Transformer,Voltage Regulator/ stabilizer,Rectifier,Transducer,Break down tester,Test Bench,Relay test kit,Energy saver,Test measuring instruments Panel Meter,Transformer,Voltage Regulator/ stabilizer,Rectifier,Transducer,Break down tester,Test Bench,Relay test kit,Energy saver,Test measuring instruments
132kV Dead Tank CT 66kV Live Tank CT

 

Ordering information
While ordering mention all the Electrical Specification required.

 

Note : For class PS accuracy, please specify formula for knee - point voltage for design optimisation.

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