FUNCTION

The Zero Sequence Current Transformer is used in metering electric energy, voltage controlling and relay protection application and provided for non-direct earthed neutral systems of rated frequency of 50Hz/60Hz and rated voltage of 66KV and below.

SPECIFICATIONS

There are seven parameters needed to specify the zero sequence current transformers.
1. Rated primary current.

2. Rated secondary current: 1A/5A

3. Rated frequency:50Hz/60Hz

4. Hole diameter.

5. Precision level: 0.2, 0.5

6. Rated secondary side load

7. Enclosure material: Fire retardation PBT/Fire retardation ABS.

RANGE

 Rated primary current: from 50A to 2000 A

 Hole diameter: 80mm-300mm

 Rated secondary side load: 2.5-10VA

TESTING AND QUALITY

All Mingrui Zero Sequence Current Transformers are designed, rated, manufactured and tested in strict compliance with IEC60044-1. Routine tests performed on each Zero Sequence Current Transformer are power frequency withstand test, short time current test, temperature rise test, verification of terminal markings and inter-turn overvoltage test . Mingrui's internal quality system has been developed and certified under ISO 9001 quality system

CONSTRUCTION

High insulation flam-retardant casing with a silicon steel coil made toroidal core on which the secondary coil wound and sealing with epoxy resin.