Current transformer epsilon % error curve calibration step

 Cast Iron electrical motor auto spare parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality
3. Delivery Detail:within 10 days after receiving deposit
Calculate according to the protection type (1) an single phase motor electric current flows through the current transformer ratio; (2) according to the model of current transformer, variable ratio and a current ratio, on the 10% error curve to determine the permission of the current transformer secondary load; (3) according to the most severe type of short electric generator circuit current transformer secondary load, the calculation of current transformer actual secondary load; (4) the practical secondary load and allow the secondary load. Such as the actual secondary load is less than the allowed secondary load, said current transformer error less than 10% error: 1) increasing the connection wire section or shorten the connection wire length, Three phase motor to reduce the actual secondary load; 2) choose larger current transformer, reduce a current ratio, increase to allow secondary load; 3) the secondary winding of current transformer in series, a doubling of allowing the secondary load.

The role of current transformer, current transformer

 AC Electric motor Plastic fan parts 
Specifications
1. Customised
2. good quality
3. 20 years manufacturing experience
4. Delivery Detail: 20-35 days after receiving payment
Can the function of current transformer is the numerical larger current through a variable than convert numerical smaller secondary current, used for protection, measurement and other purposes. If change ratio of 400/5 of the current transformer, which can transform the actual for 400 a current of 5 a current. 1 principle of selection and inspection of current transformer) current transformers rated voltage is not less than the rated voltage instruction in line; 2) a load calculation according to the current IC choose current transformer changes; 3) choose according to the requirements of the secondary loop current transformer accuracy and calibration accuracy; 4) check dynamic stability and thermal stability. 2 current transformer converter than choice. Current transformer is a rated current I1n and the ratio of the secondary rated current I2n, called a current transformer rated current transformer ratio, Ki = I1n/I2n material N2 / N1. Type, N1 and N2 for current transformer primary winding and secondary winding turns. 


Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor
Specifications
Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Current transformer primary side than rated current standard (e.g., 20, 30, 40, 50, 75, 100, 75, 2 (A) xa/C) wait for A variety of specifications, the secondary side current rating is usually 1 A or 5 A. Says the same two xa/C products have two kinds of current ratio, by changing the product at the top of the oil storage tank outside the connector wiring way, when the series current ratio of a/C, parallel 3 phase induction motor current ratio of 2 xa/C. In general, the choice of measurement with ct (current transformer) current transformer ratio should make one times rated current I1n not less than the load current in a circuit (IC). Such as load calculation in Induction motor line current is 350 a, the converter of current transformer ratio ac fan motor should choose 400/5. Protect with current transformer to ensure its accuracy requirement, can be changed than done.

The advantages and disadvantages of dc and ac withstand voltage test

AC fan cooling motor fan cover 

Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 

4. Type: Motor Cover 
Dc withstand voltage test: can effectively detect insulation be affected with damp be affected with damp, the overall defects such as dirt, and can pass the curves of relationship between electric current and leakage current found local defect of the insulation. Three phase motor According to the insulation resistance under dc voltage is due to the partial pressure, therefore, can more effectively than communication found end insulation defects. At the same time, due to the insulation under dc voltage is basically do not produce dielectric loss, therefore, less damaging dc withstand voltage of the insulation. In addition, since only the dc withstand voltage supply small leakage current, thus the required test equipment capacity is small, easy to carry. 

Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor
Specifications
Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Ac withstand voltage test, the test equipment electric fan motor parts voltage of 2.5 times and above, from the thermal breakdown of dielectric loss point of view, can effectively find the partial defects and the weakness of insulation aging dissociation. Because mainly by the capacitive pressure under alternating voltage, so can effectively exposed equipment insulation defects. However, ac withstand voltage of insulation destructive than dc, and because the test for capacitive current, so you need to test equipment of large capacity. Above all, dc withstand voltage test and power frequency ac withstand voltage test can effectively find the insulation defects, but have different characteristics, so the two methods can not replace each other, when necessary, magnet generator shall be carried out at the same time, complement each other.