0,66 kV Null-sequence (residual) current transformers, ТЗЛМ type

0,66 kV Null-sequence (residual) current transformers, ТЗЛМ type

The transformers are designed for connection to relay circuits for protection against earth fault of the individual cores of three-phase cable through transformation of the arisen null-sequence (residual) current and may be installed on the cables with diameter up to 70mm - for ТЗЛМ-Э-0,66-01,

with diameter up to 100mm - for ТЗЛМ-Э-0,66-02,

and with diameter up to 200mm - for ТЗЛМ-Э-0,66-03.

THE TECHNICAL PARAMETERS

The parameters name The parameters value
ТЗЛМ-Э-0,66-01 ТЗЛМ-Э-0,66-02 ТЗЛМ-Э-0,66-03
The rated voltage, kV 0,66
The testing one-minute voltage, kV 3
The rated frequency, Hz 50 или 60
Internal diameter, mm 70 102 206
The transformation ratio 25/1 25/1 60/1
The rated frequency, Hz 50
One-second thermal current of the secondary winding, A 140
The winding`s primary current sensitivity, at work
with РТЗ-51 relay with a current setpoint of 0.032A
and the connecting wires resistance 1 Ohm, not more, A:		  
- at work with one transformer 2,8
- at work with two transformers, serial connection 3,2
- at work with two transformers, parallel connection 4,8
Dimentional drawing thumb=left]/uploads/posts/2015-10/1445502786_tzlm1.jpg[/thumb]

The transformer includes a secondary winding, immersed in the cast epoxy compound, which is also the main insulation and protects the winding from mechanical and environmental influences. The power cable fulfills the role of a primary winding passing through the secondary winding.
Transformers are designed for:
- Altitude up to 1000m;
- Ambient temperature from -40°C to + 40°C (category У2 ГОСТ 15150);
- Relative humidity 100% at 25°C;
- The transformer space position - any.
Transformers are made by ДСТУ IEC 60044-1:2008