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TransformerEarthing Transformer (Zig Zag Transformer)

General Description

  • IEC 60076-6, ANSI/IEEE Std C57.12, NEMA

  • ISO 9001, KEMA, CESI, CE, TUV, UL, ASTA

  • Mineral Oil / Vegetable Oil (FR3), Free PCB

  • Seismic design, ETGI-1.020, IEEE Std 693, NCh2369

  • Structural design, ASTM A325, ANSI/AISC 360, AWS D1.1

  • High altitude correction per IEC 60076 & IEEE C57.12, ~ 5000m

  • Earthing transformer creates a neutral point for a network

  • Limit the line to earth current under system earth fault condition

  • Z connection provides linear and specified zero sequence impedance

Typical Specification

35kV Earthing Transformer (Zig Zag Transformer)

Rated Voltage (kV)

 Tapping range

Vector Group

Zero Phase Impedance (Ω)

Rated Short-time Neutral Current (A)

Duration for Rated Short-time Current (s)







30

 

33

 

34.5

 

35

 

36

±5%

 

or

 

±2x2.5%

ZN / Zig-Zag

22.9

2500

3

85

200

10

99.6

600

10

57.3

1003

10

56.7

1100

10

95.3

600

15

70

430

30

54.4

1051

30


10kV Earthing Transformer (Zig Zag Transformer)

Rated Voltage (kV)

 Tapping range

Vector Group

Zero Phase Impedance (Ω)

Rated Short-time Neutral Current (A)

Duration for Rated Short-time Current (s)







6

 

6.3

 

10

 

10.5

 

11

±5%

 

or

 

±2x2.5%

ZN / Zig-Zag

63.5

300

10

22.86

500

10

16.5

1050

10

10

1905

10

190.5

100

30

38

500

30