With the development of high-voltage power equipment insulation monitoring technology, micro-current (mA, micro-amp level) sensors are more and more widely used, while single-turn feed-through micro-current sensors have no effect on equipment wiring due to their primary and secondary isolation. It has become the first choice for sensors for online monitoring of high-voltage equipment insulation. For this kind of current sensor, it is required to have high accuracy, good anti-electromagnetic interference capability and long-term stability. The traditional passive sensor cannot guarantee the accuracy and stability of the phase transformation error, and it is difficult to meet the requirements. The micro-current sensor using active zero-flux technology has the above excellent performance, and can accurately measure the leakage current of high-voltage equipment such as transformers, current transformers, voltage transformers, coupling capacitors, and arresters.
BNWXLW series passive zero-flux leakage current sensor is a micro-current sensor specially developed for on-line monitoring of high-voltage electrical equipment insulation. The material with high initial permeability is selected as the iron core, and the multi-layer metal shielding measures are adopted to adapt to the negative feedback technology circuit of the customer's PCB, which can automatically compensate the iron core and make the iron core work in an ideal zero magnetic flux state. The sensor can accurately detect the power frequency current of 100μA-700mA. The phase transformation error is not greater than 0.01°, and it has good temperature characteristics and electromagnetic field interference ability, which fully meets the accuracy of equipment sampling under complex power station field interference.
It can accurately measure μA-level current, with high measurement accuracy and good linearity;
Multiple shielding, strong anti-interference ability, can work in complex environment;
Optional socket output or aviation plug output;
Special waterproof and anti-corrosion metal shell, epoxy resin potting, can work outdoors for a long time.
|Electrical Symbol||Performance parameters||Small Signal Measurement
(Match client circuit)
|Large Signal Measurement
|I N||Rated Input||500mARMS||10ARMS|
|Uc||Supply Voltage||Client Circuit customization||/|
|IC||Max Power Consumption||10mA||/|
|f||Operating Frequency||50-400 Hz|
|TA||Operating Temperature||-40℃… +85oC|
|Shell||Metal Shell||Output Mode||Socket block/shielded wire|
|Metal Core Material||Nanocrystalline/Permalloy||Seal||Flexible Silicone & Epoxy|
|Magnetic Screen Structure||Carbon Steel/Permalloy||Construction Plan||Base Installation Fixed|
|Product image||Model NO.||Specification||Outline Installation Drawing|
|Product Image||Model NO.||Specification||Outline Installation Drawing|
Note: can be customized according to customer requirements (through hole diameter, external dimensions, parameter transformation ratio)
Address：Head Office: No.8 Chuangye Avenue, Economic Development Zone, Tianmen City, Hubei Province, China (Zip Code: 431700) Nanjing Office: Building 23, Baijiahu Science and Technology Industrial Park, No.2 Qingshuiting West Road, Jiangning Economic Development Zone, Nanjing City, Jiangsu Province,China (Zip Code:211106)