Current transformers TZL-1 O5.1 (ТЗЛ-1 О5.1)

Current transformers TZL-1 O5.1 (ТЗЛ-1 О5.1)

Zero-phase sequence current transformer TZL-1Description

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 requirements of GOST 15150 in climatic version "O" (generally used) location category 3, and is intended for operation under the following operating conditions:

  • operating ambient air temperature from minus 50 °C to plus 55 °C;
  • ambient air humidity is 98% at 35 °C;
  • mounting in any position.

The transformer is patented
Patent Certification №6271 

Table 1. Technical data

Rated voltage, kV

0,66

Test voltage, kV, during one minute

3,3

AC current frequency, Hz

50 (60)

Transformation coefficient

25/1

One-second secondary winding thermal stability current, A

140

Voltage at secondary windings terminals (1И1, 1И2) at the load of 1 Ω and capacity coefficient that equals to 1, while the current of 40 mA at 50 Hz frequency is running though winding (2И1; 2И2) for checking protection operation, mV, no less than

10

Weight, kg

3,3 ±0,2

Table 2

Parameter

Transformers connection

Parallel

Serial

Number of transformers

1

2

3

4

2

3

4

5

Protection responsivity to the primary current with relay RTZ-51, no more than, A:

 

set point current 0,02

1,5

2,0

2,5

2,8

1,5

2,0

2,2

2,5

set point current 0,122

7,0

12,0

15,5

18,5

7,5

8,0

9,0

10

General view of transformer (drawing)