1. The method of imitating the leakage working current sent by the testing instrument is selected to output the low voltage working current of the step-down transformer.

The output voltage of the step-down device that mimics the leakage current is controlled by the adjustment end of the adjustable potentiometer. That is to say, according to the adjustment of the adjustable potentiometer, the working voltage of the intermediate stage of the input transformer is gradually increased from zero, and the secondary output of the transformer Imitating leakage current is gradually added, so that the operating current characteristics of leakage maintenance can be detected.

The operating current and time detection of leakage maintenance are controlled by the detection button on the control panel of the device. When the detection button is pressed, a certain aspect of the output mimics the leakage current, and at the same time the electronic signal can turn on the chronograph millisecond. Therefore, after the leakage protection switch is operated, the time recorded is the operation time of the leakage maintenance power switch when the leakage current enters.

 

2. The machine-equipped power socket is set on the control panel of the device, which can blow the fuse faster, test the connection line socket, power switch, maintenance button, functional power switch, reset button, detection button and the mA displayed by digital technology. Table, millisecond table, etc.

The zero-sequence transformer no longer leaks. The characteristic measurement of the maintenance device in the casing of the maintenance device 1. Preparation before the test. Before the tester is connected to the power supply, the "power switch" of the instrument and equipment should be in the disconnected position, and the power supply of the host should be connected On the power supply side (AC220V) of the main unit of the leakage maintenance device, the phase and ground wires can not be connected wrongly. The test connection wire passes through the zero-sequence transformer and then connects to the in-phase wire of the main unit power supply of the tester. Put the function power switch of the detector to the "preset" position. After checking that the connection line is correct, turn the adjustable potentiometer of the "working current conditioning" on the control panel of the detector to the zero position by turning it counterclockwise, and press down the "power switch" "At this time, the indication of the milliamp meter and millisecond meter should be zero, if it is not zero, just click the "reset" button.

 

3. Leakage maintenance device itself leakage operation working current or leakage non-operation working current measurement (load side lead should be removed, turn on the function power switch to the "preset" position, after the leakage maintenance device is turned on, click to detect at this time Press the button and slowly adjust the adjustable potentiometer on the control panel of the tester in a clockwise direction. Then the mA meter of the tester should show a mA value, and the working current gradually increases until the leakage maintenance device operates. The reading displayed by the milliammeter at this time is the operating current of the leakage operation.