Medium voltage measuring potential transformers

EMIC

General

Medium voltage measuring potential transformers type PT* are instruments convert large AC voltage in the primary circuit to an appropriate level for secondary circuit equipment (relays and meters) at the medium voltage line (up to 38.5 kV).

PT* series are designed epoxy casting or insulating oil immersed type.

PT* series have high performance and high reliability. They are manufactured and tested by modem technology line and equipments, ensured quality according to ISO9001:2000. They comply with accuracy class specification of the international standards IEC 186; IEC60044-2.

There are medium voltage feeding (auxiliary) potential transformer for supplying low voltage to CB reclose and other equipments.

Features

The steel cores are made of the grain-oriented silicon steel with high permeability, ensuring minimum power fluctuation.

The windings are made of enamel wire with high quality, temperature up to 2000C, resistance Acid, Alkali, Oil…

The steel cores and windings are encapsulated by epoxy resin compound, composite or insulating oil immersed with high insulation, impervious to moisture.

There are many types:

  • PTs for measuring phase voltage.  
  • PTs for measuring line voltage.
  • PTs with 1 secondary winding (1 measuring winding).
  • PTs with 2 secondary windings (1 measuring winding, 1 protection winding).
  • PTs with 1 ratio.
  • PTs with 2 ratios.
  • Feeding (auxiliary) PTs for CB reclose and other equipments.
  • PTs for measuring, Feeding PTs use to salt catch area.

The primary inputs are connected by parallel groove connectors or other types with high trustworthy.

The secondary terminals are located in an integral terminal block of body with protecting box, terminal cover made of aluminium or PC plastic and sealing screws.

The connection diagram marked on the Name-plate.

The base with 4 holes is easy for installing PT.

Indoor or outdoor service.

Note poles when connection.

NOMENCLATURE

 

No

Type

Highest voltage for equipment

1

PT10-n1, n2, n3, n4, n5

12kV

2

PT15-n1, n2, n3, n4, n5

17.5kV

3

PT22-n1, n2, n3, n4, n5

24kV

4

PT35-n1, n2, n3, n4, n5

38.5kV

 

SPECIAL REGULATIONS

 

PT

Medium voltage measuring potential or feeding (auxiliary) transformer

n1

Rated voltage (line voltage)

n1=10: Rated voltage 6-10kV

n1=15: Rated voltage 15kV

n1=22: Rated voltage 22-24kV

n1=35: Rated voltage 35-38.5kV

n2

n2=1H: PT with 1 phase 2 bushings (measuring line voltage)

n2=1ZH: PT with 1 phase 1 bushing (measuring phase voltage)

n2=3ZH: PT with 3 phases, neutral connect to ground

n3

Insulating type - Service type

n3=I: epoxy casting type - Indoor

n3=O: epoxy casting type - Outdoor

n3=ID: Oil immerse type - indoor

n3=OD: Oil immerse type - outdoor

n4

Number of steps of inputs (primary voltage) or outputs (secondary voltage)

n4 = 1 or 2

n5

Without n5: PT with only 1 measuring coil

n5=M: PT with added 1 measuring coil

n5=P: PT with added 1 protection coil

n5=S: Feeding (auxiliary) transformer

n6

Add character

n6=TCS: Product use in area to catch salt

 
 
 

Allied Companies

  • EMIC
  • HEM
  • CADIVI
  • CTBT
  • THIBIDI
  • EPT
  • VIHEM
  • VINAKIP
  • CFT
  • HPMC