Current transformers TZLE-125 (ТЗЛЭ-125) and TZL-200 (ТЗЛ-200)

Current transformers TZLE-125 (ТЗЛЭ-125) and TZL-200 (ТЗЛ-200)

Zero-phase-sequence current transformer TZLE-125Description

The transformers are intended for powering relay protection circuits from grounding separate conductors of three phase cable through transformation of null string currents. The transformer is fixed on the cable.
The transformers are manufactured in compliance with the standard requirement of GOST 15150 in climatic version "УХЛ" (moderate cold) location category 2 (for TZLE-125 transformers) and climatic version "У" (moderate) location category 2 (for TZL-200 transformers) and are to be used under the following operating conditions:

  • altitude above sea level is not higher than 1000 m;
  • ambient air temperature while operation is from minus 60 to plus 55°C;
  • ambient air humidity is 100% 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 any position. 

Table 1. Technical data of transformer TZLE-125

Parameter

Normal value

Rated voltage, kV

0,66

One-minute test voltage, kV

3

Rated frequency, Hz

50 or 60

Transformation coefficient

30/1

Protection sensibility at the primary current while working with relay RTZ - 51 with the latching current set point 0,032 A and connection wire resistance 1 Ω, no more, A:
one transformer operation
two transformers in serial connection
two transformers in parallel connection

2,8
3,2
4,8

One-second thermal stability current of secondary winding, A

140

Mass, kg, no more

8,5

Table 2. Technical data of transformer TZL-200

Parameter

Normal value

Rated voltage, kV

0,66

One-minute test voltage, kV

3

One-second thermal stability current, A

140

Rated frequency, Hz

50 or 60

Transformation coefficient

60/1

primary current protection sensibility while operating with relay RTZ-51 at the set point 0,03 A, no more, A

2,8

Mass, kg

9,8

General view of transformers (drawing)