Hall current sensor

(1) The current sensor must select products of different specifications according to the rated effective value of the measured current. If the measured current exceeds the limit for a long time, it will damage the final pole power amplifier tube (referring to the magnetic compensation type). Generally, the duration of 2 times the overload current should not exceed 1 minute.

(2) The voltage sensor must be connected in series with a current-limiting resistor R1 on the primary side according to the product description, so that the primary side can obtain the rated current. In general, the duration of 2 times overvoltage should not exceed 1 minute.

(3) The best accuracy of the current and voltage sensor is obtained under the condition of the primary side rated value, so when the measured current is higher than the rated value of the current sensor, a correspondingly large sensor should be selected; when the measured voltage is higher than the voltage sensor When the rated value, the current-limiting resistance should be readjusted. When the measured current is less than 1/2 of the rated value, in order to get the best accuracy, you can use more turns.

(4) The sensor with insulation withstand voltage of 3KV can work normally in 1KV and below AC systems and 1.5KV and below DC systems for a long time, and 6KV sensors can work normally in 2KV and below AC systems and 2.5KV and below DC systems for a long time. , Be careful not to use overpressure.

(5) When used on a device that requires good dynamic characteristics, it is easy to use a single copper-aluminum busbar and fit the hole diameter, and the dynamic characteristics will be affected by replacing small or large turns.

(6) When used in a high-current DC system, if the working power supply is open or faulty due to some reason, the iron core will produce a large residual magnetism, which is worth noting. Remanence affects accuracy. The method of demagnetization is to not add a working power source, pass an AC on the primary side and gradually reduce its value.

(7) The ability of the sensor to resist the external magnetic field is: a current that exceeds 2 times the current value of the original side of the sensor at a distance of 5 to 10 cm from the sensor, the generated magnetic field interference can be resisted. When three-phase high-current wiring, the distance between phases should be greater than 5~10cm.

(8) In order to make the sensor work in the best measurement state, the simple and typical regulated power supply described in Figure 1-10 should be used.

(9) The magnetic saturation point and circuit saturation point of the sensor make it have a strong overload capacity, but the overload capacity is time-limited. When testing the overload capacity, the overload current of more than 2 times shall not exceed 1 minute.

(10) The temperature of the primary side current bus bar should not exceed 85°C. This is determined by the characteristics of ABS engineering plastics. Users have special requirements. High-temperature plastics can be selected as the outer shell.