High Frequency Electric Instrument Transformer Busbar Current Transformer of Distribution Transformer

• Customization: Available
• Application: Electronic, Instrument, Position Sensor, Audio, Lighting
• Type: Current Transformer
• Phase: Single
• Operation Condition: Outdoor
• Usage: Protection, Measurement
• Winding Form: Multilayer Honeycomb Type
• Insulating Medium: Insulating Paper
• Installation: Active Type
• Magnetic Circuit Structure: Single Stage Type
• Voltage Transformation Principle: Electromagnetic Type
• Product Name: AC Current Transformer/ Current Sensor Transformer
• Other Name: Current Transformer Cts/ Current Transducer Transf
• Product Type: Current Sensor / Current Inductor/ Current Sensor
• Keywards: Split Core Current CT / Current Transformer CT
• Use on: Energy Meter/ Electric Energy Meter/ Power Meter
• Same Product: Current Transformer Clamp/ Hall Sensor
• Similar Product: Voltage Transformer/ Miniature Current Transformer
• Category: Power Supply Transformer /Instrument Transformer
• Related Products: Single Phase Cts/ Busbar Type Current Transformer
• Core Type: Permalloy Core / Split Core
• Like Product: High Frequency / Ring Type Current Transformer
• Use for: Power Operations and Electricity Reconstruction Pr
• Input: 0-5000A
• Output: 0.333V, Mv or Mv
• Accuracy: 1.0 Class
• Transport Package: Cartoniron Pallet, Woven Bags, Box, Polybag
• Specification: 100/200/300/400~5A
• Trademark: Leicheng
• Origin: China
• HS Code: 8504311000
• Production Capacity: 90, 000 PCS/Month

Product Description

Product Description

 

The principle of current transformer is based on the principle of electromagnetic induction.

The current transformer is composed of a closed core and windings.

Its primary side winding has a small number of turns and is connected in series with the circuit that needs to measure the current, so it often has all the current of the line flowing through it.

Its secondary side winding has a relatively large number of turns and is connected in series with measuring instruments and protection circuits. When the current transformer is working, its secondary side loop is always closed, so the impedance of the series coil of the measuring instrument and the protection loop is very small, and the working state of the current transformer is close to a short circuit.

Current transformers are used to convert large currents on the primary side into small currents on the secondary side. The secondary side cannot be open circuited.

The function of the current transformer is to convert a larger primary current into a smaller secondary current through a certain transformation ratio, which is used for protection, measurement and other purposes.
For example, a current transformer with a transformation ratio of 400/5 can convert an actual current of 400A into a current of 5A.

Classification of Current transformer:

Classification
1 According to usage
1) Current transformer (or measuring winding of current transformer): Provides grid current information to measuring and metering devices within the normal voltage range.

2) Protection current transformer (or protection winding of current transformer): In the power grid fault state, it provides grid fault current information to relay protection and other devices.

2 According to insulation medium
1) Dry current transformer: made of ordinary insulating materials dipped in paint as insulation.

2) Cast insulated current transformer: a current transformer cast with epoxy resin or other resin mixed materials

3) Oil-immersed current transformer: Insulated by insulating paper and insulating oil, it is generally an outdoor type and is currently commonly used in various voltage levels in my country.

4) Gas insulated current transformer: The main insulation is composed of SF6 gas.
 

3 According to the principle of current transformation
1) Electromagnetic current transformer: A current transformer that realizes current conversion based on the principle of electromagnetic induction.

2) Photoelectric current transformer: A current transformer that realizes current conversion through the principle of photoelectric conversion.

4 Divided by installation method
1) Penetrating current transformer: A current transformer used to pass through a screen or wall.

2) Pillar-type current transformer: a current transformer installed on a flat surface or a pillar and also used as a primary circuit conductor pillar;

3) Bushing type current transformer: A current transformer that has no primary conductor and primary insulation and is directly mounted on an insulated bushing.

4) Busbar type current transformer: A current transformer that has no primary conductor but primary insulation and is directly mounted on the busbar.

5 Points according to the number of turns of the primary winding
1) Single-turn current transformer: Single-turn type is commonly used for large current transformers.

2) Multi-turn current transformer: Multi-turn type is commonly used for medium and small current transformers.

6 According to the location of the secondary winding
1) Upright type: The secondary winding is at the lower part of the product, which is a commonly used structure in China.

2) Inverted type: The secondary winding is at the head of the product, which is a relatively new structural form in recent years.

7 Score by current
1) Single current ratio current transformer: that is, the number of turns of the primary and secondary windings is fixed, the current ratio cannot be changed, and it can only realize one type of current ratio transformation.

2) Multi-current ratio current transformer: that is, the number of turns of the primary winding or secondary winding can be changed, the current ratio can be changed, and different current ratio transformations can be realized;

3) Multiple core current transformer: This type of transformer has multiple secondary windings each with an iron core to meet the needs of different precision measurements and a variety of different relay protection devices. In order to meet the requirements of some devices, some of the secondary windings have multiple taps.

8 According to the technical performance of current transformers for protection
1) Steady-state characteristic type: ensure the error of current in steady state, such as P, PR, PX level

2) Transient characteristic type: ensure the error of current in transient state, such as TPX TPY TPZ TPS level, etc.

9 Divided according to usage conditions
1) Indoor current transformer: generally used for voltage levels of 35KV and below.

2) Outdoor current transformer: generally used for voltage levels of 35KV and above.

Current transformer for measurement and Protection current transformer:

Current transformer for measurement

Protection current transformer:

When measuring large alternating current, it needs to be converted into a relatively uniform current for the convenience of secondary instrument measurement (China stipulates that the secondary rating of current transformers is 5A or 1A). In addition, the voltage on the line is relatively high if measured directly. is very dangerous. The current transformer plays the role of current conversion and electrical isolation. It is a sensor used by secondary equipment such as measuring instruments and relay protection in the power system to obtain electrical primary circuit current information. The current transformer converts high current into low current in proportion. The primary side of the current transformer is connected to the primary system, and the secondary side Connect to measuring instruments, relay protection, etc. During normal operation, the secondary side of the transformer is in an approximate short-circuit state and the output voltage is very low. During operation, if the secondary winding is open-circuited or an abnormal current flows through the primary winding (such as lightning current, resonant overcurrent, capacitor charging current, inductor starting current, etc.), an overvoltage of thousands or even tens of thousands of volts will be generated on the secondary side. . This not only causes harm to the insulation of the secondary system, but also causes the transformer to burn out due to overexcitation, and even endangers the life safety of the operating personnel. The primary side has only 1 to a few turns, and the wire cross-sectional area is large, and it is connected in series to the circuit under test. The secondary side has a large number of turns and a thin wire, forming a closed circuit with an instrument with a small impedance (current coil of an ammeter/power meter). The operation of the current transformer is equivalent to a transformer with a short circuit on the secondary side. The excitation current is ignored and the ampere turns are equal I1N1=I2N2. The current ratio of the primary winding current I1 and the secondary winding I2 of the current transformer is called the actual current ratio I1/I2=N2/N1=k. Excitation current is the main source of error. The accuracy level of the current transformer used for measurement is 0.2/0.5/1/3, 1 means that the transformation ratio error does not exceed ±1%, and there are also 0.2S and 0.5S levels. The accuracy level of the current transformer for protection is 5P/10P, and 10P indicates that the composite error does not exceed 10%.

The protective current transformer mainly cooperates with the relay device. When a fault such as short circuit overload occurs on the line, it provides a signal to the relay device to cut off the faulty circuit to protect the safety of the power supply system. The working conditions of the protective miniature current transformer are completely different from those of the measuring transformer. The protective transformer only starts to work effectively when the current is several times or dozens of times larger than the normal current. The main requirements for protective transformers are: 1. Reliable insulation, 2. Large enough and accurate limit coefficient, 3. Sufficient thermal stability and dynamic stability. The maximum primary current that a protective transformer can meet the accuracy level requirements under rated load is called the rated accuracy limit primary current. The accurate limit coefficient is the ratio of the rated accurate limit primary current to the rated primary current. When the primary current is large enough, the iron core will be saturated and unable to reflect the primary current. The accuracy limit coefficient represents this characteristic. The accuracy level of protective transformer is 5P and 10P, which means the allowable error is 5% and 10% at the rated accurate limit primary current. The inrush current when a line fails generates heat and electromagnetic forces, which the protective current transformer must withstand. When the secondary winding is short-circuited, the effective value of the primary current that the current transformer can withstand within one second without damage is called the rated short-time thermal current. When the secondary winding is short-circuited, the primary current peak that the current transformer can withstand without damage is called the rated dynamic stable current. Protection current transformers are divided into: 1. Overload protection current transformer, 2. Differential protection current transformer, 3. Ground protection current transformer (zero sequence current transformer)

Split Core Current Transformer

 

Specification:

Product Name:	Current Transformer
Core Type:	Split-Core
Phase :	1 phase
Current Conversion:	AC to AC
Ratio:	100/200/300/400~5A
Rated Primary Current (In):	50~1000A
Rated Secondary Current:	5A
Rated Primary Current range:	10%In~120%In
CT Core Window :	24mm
Accuracy:	<=0.5%
Working frequency :	50~60Hz
Enclosure Material:	ABS flame retardant plastic
Operating temperature :	-40°C to 85°C

Note:

The current transformer should not be used open circuit or connected with fuses

When the current transformer is in use, be sure to connect the load device at the output end of the transformer

Productive Process

Application

Company Profile

Hebei Leicheng Electric Power Technology Co., Ltd. is a professional engaged in power transformers, high and low voltage switchgear and related products R & D, production, sales and service of science and technology enterprises.

Since its establishment, the company has been committed to the road of professional development. With strong technical force, advanced equipment at home and abroad, innovative concept and rich manufacturing experience, has passed ISO9000 certification, the use of CAD, to provide customers with suitable regional characteristics of environmental protection, energy saving, low-carbon, high-quality products to meet the basic requirements of the market and different customers. Products are also exported to Central Asia, Africa, Southeast Asia, the Middle East, South America and other countries and regions.

At present, the company mainly produces high voltage/low voltage distribution cabinets, prefabricated substations, distribution transformers, dry type transformer, oil immersed transformer, high voltage/low voltage switches and other products.

Various electric power fittings and accessories, such as Clamp(Dead end clamp,Cable clamp, Suspension clamp, Tension clamp, Strian clamp etc...), Socket Clevis, Anchor Shackle, Spacer Dampers, Adjuster plates,Yoke plate etc...

Various Steel products, such as H-shaped steel, channel steel, steel pipe, Angle steel, hot dip galvanized iron wire, etc., are also our main products!

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Certificates

Packaging & Shipping

You can rest assured that the packaging of the product, as the last link we strictly control!

FAQ

Q: Are you a Manufacturer, factory or Trading company ?
A: Yes, We are engaging in the research and development, production and operation of transformer for over 10 years.

Q: What's your warranty terms?
A: We offer 12 months warranty time.

Q: Production Time?
A: In general, it take 4~6weeks and it depend on the different style.

Q: What's your payment terms?
A: Pay by T/T and  L/C is acceptable.

Q: How do you conduct quality control in your factory?
A: We implement 100% QC inspection to ensure every product is qualified. We have over 10 times QC inspections during the manufacturing process from raw material to the final products.Each of our unit has  3C  certificate. If you need any other Certificate, we can help you to apply it.

Q: Do you have the products in stock?
A: Normally no. All our products produce depending to your order quantity.

 Q: What should provide to make custom transformer ?
A: Technical drawing and technical specification document are the best, or you can tell us some details technical specification date as below "Quotation and Ordering Required Information".

Q: Could I have your catalog and price list for trial order in MOQ quantity?
A: All of our products are showing on Made-in-China or official website, you are always welcome to ask us to get more information directly.

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