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China LZZB9-35D Indoor Epoxy Resin Casting Current Transformer - Reliable Suppliers & Factory for Your Needs
General
It is designed for use in power systems with a rated frequency of 50 or 60 Hz and a rated voltage of 35 kV and below, installed indoors. It is mainly used for electric energy metering, current measurement, and relay protection. This type of current transformer is generally used in air insulated switchgear rated at 6 to 35 kV.
Standards
- IEC61869.1-2007 Instrument transformers Part 1: General technical requirements
- IEC61869.2-2012 Instrument Transformers Part 2: Complementary technical requirements for current transformers
- GB311.1-1997 Insulation and coordination of high-voltage transmission and transformation equipment
- GB 5583-1985 Partial discharge measurement of instrument transformers
- GB/T 22071.1-2008 Instrument Transformer Test Guidelines Part I: Current Transformers
- JJG 1021-2007 Electrical Transformer Verification Regulations
Service Conditions
- Ambient temperature: Maximum temperature +40℃; Minimum temperature -5℃. The average daily temperature does not exceed 30℃.
- Altitude: Does not exceed 1000m.
- Other Conditions of Use: The effects of insolation radiation can be ignored.
- Air Quality: The ambient air is free of obvious dust, smoke, corrosive gases, steam, or salt.
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Humidity conditions are as follows:
- The average relative humidity measured within 24h does not exceed 95%.
- The average water vapor pressure within 24h does not exceed 2.2kPa.
- The average relative humidity in one month does not exceed 90%.
- The average water vapor pressure in one month does not exceed 1.8kPa.
Technical Data
Rated insulation level: 40.5/95/185kV
Rated frequency: 50Hz or 60Hz
Rated secondary current: 5A or 1A
| Rated primary current (A) | Accuracy class combination | Accuracy class and rated output | Short time thermal current (kA/s) | Rated dynamic current (kA) | Weight (kg) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0.2(S), 0.5(S) | 0.5 | 5P20 | 5P25 | 5P30 | kA | S | ||||
| 20-100 | 0.2(S)/5P 0.5(S)/5P 0.2(S)/0.5(S)/5P 0.2(S)/0.5(S)/5P/5P |
30 | 30 | 30 | 25 | 20 | 150│1n | 2 | 375│1n | 140 |
| 150 | 25 | 1 | 63 | |||||||
| 200-250 | 31.5 | 1 | 80 | |||||||
| 300-500 | 31.5 | 2 | ||||||||
| 600-800 | 31.5 | 4 | ||||||||
| 1000-3150 | 31.5 | 4 | ||||||||
Note: If the parameters are beyond the above range, it can be discussed and confirmed with us.
Appearance and installation size
Frequently Asked Questions (FAQ)
What are the primary applications of this current transformer?
This current transformer is designed for indoor installation in power systems with a rated voltage of 35 kV and below. It is primarily used for electric energy metering, current measurement, and relay protection in air-insulated switchgear.
Which international standards does this transformer comply with?
It strictly complies with IEC61869.1-2007 and IEC61869.2-2012 standards, as well as Chinese national standards including GB311.1-1997, GB 5583-1985, GB/T 22071.1-2008, and JJG 1021-2007.
What are the environmental limits for operating this device?
The ambient temperature must remain between -5℃ and +40℃, with a daily average not exceeding 30℃. The installation altitude should not exceed 1000 meters, and the environment should be free from significant dust, corrosive gases, steam, or salt.
What are the humidity requirements for installation?
The daily average relative humidity must not exceed 95% (water vapor pressure ≤ 2.2kPa), and the monthly average relative humidity must not exceed 90% (water vapor pressure ≤ 1.8kPa).
Can I customize the technical parameters if they exceed the standard range?
Yes. If your application requirements fall outside the standard specifications listed in our technical data table, please contact us directly to discuss customized solutions.