LFZZJ-12 current transformer
This type of current transformer is an epoxy resin cast insulated fully enclosed structure. It is suitable for use in indoor power systems with a rated voltage of 10kV and below and a rated frequency of 50Hz or 60Hz for current, electrical energy measurement and relay protection. Suitable for rural outdoor substations, it can also be used for small substations in industrial enterprises, especially unattended substations.
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Current transformer
Overview
This type of current transformer is an epoxy resin cast insulated fully enclosed structure. It is suitable for use in indoor power systems with a rated voltage of 10kV and below and a rated frequency of 50Hz or 60Hz for current, electrical energy measurement and relay protection. Suitable for rural outdoor substations, it can also be used for small substations in industrial enterprises, especially unattended substations.
Model and meaning
Structure introduction
The insulation of this type of transformer is mainly epoxy resin. The iron core uses high-quality, high-magnetic material, primary and secondary windings and iron core, all poured into epoxy resin, and has excellent insulation properties. The output line is on the top of the cast body, the output line marks are P1 and P2, the output end marks of the measurement stage winding are S1 and S2, the transformer is polarity reduction, and there are 4 mounting holes on the base for installation and use.
Technical data
Rated insulation level: 12/42/75kV;
GB/T 20840.1-2010 "Transformers Part 1: General Technical Requirements"
GB/T 20840.2-2014 “Supplementary Technical Requirements for Transformers Part 2 Current Transformers”
Surface creepage distance: meets the requirements of Level II filth level;
Load power factor: COSø=0.8 (hysteresis);
Ambient temperature: minimum temperature -5℃, maximum temperature 40℃;
Instrument security coefficient FS=5, 10;
Rated secondary current: 5A
Other technical parameters are shown in the table below:
|
Rated primary current (A) |
Accurate combination |
Rated output (VA) |
Short-term thermal current (kA) |
Withstand short-term thermal current time (s) |
Rated dynamic stable current (kA) |
|
5-15 |
0.2S level |
10
|
150In |
1 |
375in |
|
20-25 |
5 |
2 |
12.5 |
||
|
30-40 |
8 |
2 |
20 |
||
|
50-60 |
10 |
2 |
25 |
||
|
75 |
16 |
2 |
40 |
||
|
100-200 |
20 |
2 |
50 |
||
|
300-500 |
25 |
2 |
63 |
||
|
600-800 |
31.5 |
4 |
80 |
Things to note
After wiring, check whether all wiring is correct, especially the current secondary outlet S1 and S2 cannot form an open circuit.
The base grounding terminal must be grounded on the site, and the transformer secondary outlet is reliably connected to ground according to regulations. Please note that the double-variable current secondary terminals S1 and S2 cannot be grounded at the same time.
The primary line installation must be P1 as the incoming side and P2 as the outgoing side.
Ordering instructions
1. Current ratio;
2. Accurate level combination;
3. Rated secondary load;
Appearance and installation dimensions
Key words:
Current transformer
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Zhengzhou KBT Transformer Co., Ltd. is a specialized production enterprise mainly based on power transformers, which integrates product development, production, sales, service and technology consulting.
HUATAO GROUP
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