Current transformers TZZ-2 (ТЗЗ-2) and TZZ-4 (ТЗЗ-4)

Current transformers TZZ-2 (ТЗЗ-2) and TZZ-4 (ТЗЗ-4)

Zero-phase-sequence current transformer TZZDescription

The transformer is intended for powering relay protection circuits from grounding three phase cable separate conductors through transformation of null string currents. The transformer in fixed on the cable.
The transformers are manufactured in compliance with the standard requirments of GOST 15150 in climatic version "Y" (temperate) location category 3 and are intended for operation under the following operating conditions:

  • ambient air temperature while operation is from minus 45 to plus 40 °C;
  • ambient air humidity is 98% at 25 °C;
  • the environment should be non-explosive, without corrosive steams in concentrations that are likely to destroy metal or insulation (atmosphere type II as to GOST 15150);
  • mounting in vertical position or horizontal position when fixed on the horizontal surface. 

Table 1. Technical data

Parameter

TZZ-2

TZZ-4

Rated voltage, kV

0,66

0,66

One-minute test voltage, kV

3

3

Rated frequency, Hz

50 or 60

50 or 60

Transformation coefficient

20/1

20/1

Magnetizing voltage, V

110

110

The number of male plug cables

2

4

Diameter of male plug cables, mm

50

50

Primary current protection sensibility with relay RTZ-51 at the set point 122 mA, and relay RTZ-50 at the set point 60 mA, no more, A

3

3

Table 2.

Transformer

Mass, kg

Picture

TZZ-2

60

1

TZZ-4

150

2

General view of transformer (drawing)