The application of clamp ammeters in high-voltage systems
The clamp ammeter used for testing high-voltage systems must be a specialized high-voltage clamp ammeter. To possess: high precision, strong stability, strong anti-interference ability, and insulation protection. While ensuring the safety of on-site measurements, there is also a high requirement for the accuracy of test data.
Application of clamp ammeters in high-voltage systems:
1. Suitable for measuring high and low voltage systems up to 60KV, using a complete set of protective insulation rods for testing high voltage; For low-voltage systems below 600V, a high-voltage clamp meter can be used to directly test the AC current and leakage current of the circuit, which is equivalent to a high-precision low-voltage ammeter.
2. Measuring the current of high-voltage system lines, online current measurement, and also with peak holding, data holding, storage, wireless transmission and other functions. Its dedicated clamp shaped ammeter can easily clamp or withdraw the measured wire by pressing or pulling the insulation rod.
3. It can be used as a ratio tester for high and low voltage current transformers and a zinc oxide lightning arrester tester. A high-precision clamp watch with a minimum range of 10 microamperes.
The high-voltage clamp ammeter is an essential safety instrument for measuring the current value of high-voltage lines, so it is necessary to regularly maintain the instrument. And high-voltage testing personnel must follow the operating procedures and obtain relevant national high-voltage operation certification before conducting on-site testing
When using a common ammeter to measure current, it is necessary to cut off the circuit and stop the machine before connecting the ammeter for measurement. This is very troublesome, and sometimes normal running motors are not allowed to do so. At this point, using a clamp ammeter becomes much more convenient, as it can measure current without cutting off the circuit. The working principle of a clamp ammeter is as follows:
The tested circuit wire passing through the iron core becomes the primary coil of the current transformer, and the current is induced in the secondary coil through the current. So that the ammeter connected to the secondary coil has an indication - to measure the current of the tested circuit. The clamp meter can be changed to different ranges by shifting the gear of the switch. But it is not allowed to operate with electricity when shifting gears. The accuracy of clamp watches is generally not high, usually ranging from 2.5 to 5 levels. For ease of use, there are also conversion switches with different ranges in the meter for measuring different levels of current and voltagearm to remind the user. This function has certain practical value and the price is not high.
