Product descriptions from the supplier

Structural features

The transformer is one of import electrical appliances in electric system. It's similar to power transformer and also used to transformer voltage or current in the circuit. However, transforming voltage and current by power transformer aims at transferring electric energy  while transforming voltage and current by transformer aims at measuring and monitoring voltage or current in the circuit. Generally, power transformer owns large capacity as well as large change difference of voltage or current. While transformer owns small capacity as well as smaller change difference of voltage or current. In measuring circuit. The transformer that transforms current and supplies electricity for current meter and relay is called current transformer. The transformer that transforms voltage and supplies electricity for voltage meter and relay is called voltage transformer.

Model definition

The model composition of current transformer and voltage transformer is divided into two parts. The first part is product  model letter and design number and the letter part is rated voltage grade (kV) and specific using environment code. (the definition of model letter is shown as know).

Specific suing environment code of transformer

1. Code of using in highland area: "GY"

2. See the right table for code using of using in polluted area.

3. Code of using in corrosive area: "F"

4. Code of using in dry tropic region: "TA"

5. Code of using in wet tropic region: "TH"

6. Code of using in dry-wet tropic: "T"

7. "WS" denotes the occasion that wet-rising limit value is 5K lower than standard stipulated value.

Main technical parameters

Applicable working conditions

1. The height above sea level is not above 1000m. (Please indicate height above sea level if it is used in high land area).2. Max.
change of environment temperature doesn't exceed 5℃ to 40℃. (If there is any requirement. Please indicate in the order).
3. Ordinary products can be used in the area with relative humidity not above 85%.
4.There is no gas, steam, chemical sedimentation, dust or dirt or other explosive and corrosive medium that seriously affect
transformer at installation site. There is no serious vibration or bump. Either.

Precautions

1. While the primary current goes through current transformer, the open circuit of secondary winding is not allows, other wise
high voltage will produce and affect the performance of product.2. The short circuit of secondary winding of voltage transformer
is not allowed. Otherwise the transformer will be burned.
3. The repeated power frequency withstand voltage test of primary winding shall be conducted under 80% of stipulated test voltage
value.

Cited standard

GB/T20840.3-2013 《Inductive Voltage transformer》

GB/T20840.2-2014 《Current transformers》

GB/T20840.4-2015 《Combined instrument transformers》

JB/T10433-2004《Three-phase Voltage transformers》

JB/T10432-2004《Three-phase combined instrument transformers》

GB/311.1-1997 《Insulation coordination of high voltage transforming equipment》

GB/T7354-2003《Partial discharge measurements》

DL/T653-2009《Specification of discharge coils for high voltage shunt capacitor for order》

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