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.