A wireless surge arrester leakage current sensor is a detection device that can sense the information of the measured current and transform the sensed information into an electrical signal or other required form of information output that meets certain standards, so as to meet the requirements of information transmission, processing, storage, display, recording and control.
Wireless surge arrester leakage current sensors, also known as magnetic sensors, are widely used in our lives, including in household appliances, smart grids, electric vehicles, wind power generation, and more. Examples of magnetic sensors used in everyday life include computer hard drives, compasses, and other household appliances.
It can measure various types of current, from direct current to alternating current of tens of kilohertz. Its working principle is mainly based on the Hall effect. When the primary conductor passes through the current sensor, the primary current IP generates magnetic lines of force. The primary magnetic lines of force are concentrated around the magnetic core. The Hall electrode built into the air gap of the magnetic core can generate a voltage of only a few millivolts that is proportional to the primary magnetic lines of force. The electronic circuit can convert this tiny signal into a secondary current IS.
Precautions for using current and voltage sensors
1. Different specifications of products must be selected appropriately according to the rated effective value of the current being measured.
2. A current-limiting resistor R1 must be connected in series on the primary side as per the product instructions to ensure that the primary side receives the rated current. Under normal circumstances, the duration of a 2x overvoltage should not exceed 1 minute.
3. The accuracy is obtained under the primary side rated value condition, so when the measured current is higher than the rated value of the current sensor, a correspondingly larger sensor should be selected.
4. Sensors with an insulation withstand voltage of 3KV can operate normally for extended periods in AC systems of 1KV and below and DC systems of 1.5KV and below.
5. When used in a high-current DC system, if the power supply is open-circuited or malfunctions for some reason, the iron core will generate a large amount of residual magnetism, which is worth noting.
6. The sensor's magnetic saturation point and circuit saturation point give it a strong overload capacity, but the overload capacity is time-limited. When testing the overload capacity, an overload current of more than twice the rated current must not exceed 1 minute.
