Forcipated mutual-inductor, forcipated ammeter and verification method of forcipated ammeter

Abstract

The invention relates to a split-core transformer and a split-core current meter, and relative self correct method of split-core current meter, wherein said split-core transformer comprises frame, iron core, detecting coil on the iron core, and correcting coil induced with detecting coil; the iron core can be separated into two semi bodies; said frame also comprises a device for controlling the combination and separation of two semi bodies; the split-core current meter has said split-core transformer and relative auxiliary circuit. Since it uses correcting coil, the split-core transformer and split-core current meter can pre-correct the error before detection.

Description

technical field [0001] The invention relates to a device for measuring current or voltage, in particular to a clamp ammeter for measuring current. Background technique [0002] Generally, traditional current measuring instruments such as ammeters and multimeters are used to measure the current. After connecting such current measuring instruments in series to the circuit, the current magnitude of the corresponding branch can be directly obtained. However, if this traditional current measurement method is used in high-voltage occasions (such as measuring the current in high-voltage wires, etc.), there are at least two disadvantages below: first, the power supply of the circuit to be tested must be cut off first, Connecting the current measuring instrument and then turning on the power supply is not only a cumbersome process, but also needs to cut off the power, which will cause great trouble to the public power grid, because frequent power outages not only bring troubles to re...

AI Technical Summary

Problems solved by technology

However, if this traditional current measurement method is used in high-voltage occasions (such as measuring the current in high-voltage wires, etc.), there are at least two disadvantages below: first, the power supply of the circuit to be tested must be cut off first, Connecting the current measuring instrument and then turning on the power supply is not only a cumbersome process, but also needs to cut off the power, which will cause great trouble to the public power grid, because frequent power outages not only bring troubles to residents' electricity consumption, but also bring troubles to factories and institutions. Second, when using this method to measure the current in high-voltage wires, the risk factor is relatively large, especially when the tester disconnects or connects the power supply, the instantaneous high-voltage change may cause damage to the instrument or even casualties

Although the above-mentioned improvements have optimized the measurement accuracy of the clamp ammeter to a certain extent, they still have not solved the fundamental problem: after the clamp ammeter has been used for a period of time, the joints of the clamp jaws are likely to be deformed and rusted, resulting in poor joints. It is tight, causing the magnetic circuit to be blocked, and looking at the existing clamp ammeters, it is impossible to compensate the above-mentioned unfavorable factors before measurement, that is, the existing clamp ammeters do not have the function of self-calibration

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