Specifications

 RK2675B Leakage Current Tester

Leakage Current Tester principles and instructions for using

Leakage current is the applied voltage in the absence of fault cases, the electrical insulation in the metal parts with each other, or between live parts and ground parts between, and through its insulating surface of the surrounding medium or the formation of the current that for the leakage current. In accordance with the United States UL standards for leakage current is included, including capacitive coupling currents, from household appliances to reach part of the conduction of current. Leakage current consists of two parts, in part, through the insulation resistance of the conduction current I1; and partly through the distributed capacitance of the displacement current I2, the latter capacitance for Xc = 1/2πfc with the power frequency is inversely proportional to the distribution of capacitive current increases with frequency increase, so power frequency leakage current increases with the increase. For example: using SCR power supply, the harmonic component so that leakage current increases.

If the assessment is a circuit or a system of insulation, then this current addition to including all the substances into the ground through the insulation (or the circuit may be conductive outer part) of the current should also include the circuit or system through the capacitive device ( distributed capacitance can be considered as capacitive devices) and into the earth currents. A longer route will form a larger distribution of capacity, increased leakage current, which is in the non-grounded systems should pay particular attention.

The principle of measuring leakage current measurement and insulation resistance is basically the same, measure insulation resistance actually a kind of leakage current, albeit in the form of resistance that out. However, formal measurement of leakage current was applied AC voltage, thus, in the leakage current component contains the capacitive component of current.

During pressure testing, in order to protect the test equipment and technical specifications of the required tests, but also need to identify one without disrupting the device under test (insulation material) to allow the maximum electric field intensity flowing through the device under test (insulation material) the maximum current value, this current is often referred to as leakage current, but the gist is only during the specified field so that the next use. Please note that distinction.

Leakage current is actually in the absence of electrical lines or equipment failures and the role of the applied voltage, the part of the current flowing through the insulation. Therefore, it is a measure of electrical insulation is one important indicator of good or bad, dare is the product key indicators of safety performance. Will be limited to a small leakage current value, which improve the safety performance of products has an important role. Low-power electrical appliances (<2KW) of the leakage current can bring their own isolated power supply tester to measure the leakage current.

Leakage current tester, for measuring the work of electrical power (or other power source) through the insulation or the distributed parameter impedance has nothing to do with the work of the leakage current. Its input impedance simulation of human body impedance.

Leakage Current Tester mainly by the pilot power, impedance conversion, range conversion, AC-DC conversion, directed sound and light alarm circuit.

Leakage current tester operation method

1, plug in the power, turned the power switch, power indicator light;

2, select the power range, press the button on the required current;

3, select the leakage current alarm value;

4, select the test time;

5, the measured object access measurement side, start leakage current tester, will test EUT voltage up to 1.06 times rated voltage (or 1.1 times), switching the phase change-over switch, respectively, read the second reading, select the numerical readings of a large leakage current value. When the change-over switch K connected with the zero line when the tester is the centerline of the sample with the shell between the leakage current; when K connected with the phase when the test is relative to the line and the shell between the leakage current. Important to note that: K, or K with the zero line connected to phase line connected with the leakage current is not necessarily the same. This is because the weakness of household appliances insulation position is random. Therefore, the leakage current test should be conducted through the K conversion polarity, whichever is the larger value as the measured leakage current value of electric appliances.

Test Notes

1, in the operating temperature measured leakage current, if not by the measured electrical isolation transformer power supply, the measured electrical appliances should be reliable color insulation material insulating pad and ground insulation. Otherwise, there will be some leakage current directly flows through the ground rather than through leakage current tester, impact test data accuracy.

2, leakage current measurement is to measure live, the measured electrical enclosure is charged. Therefore, the pilot must pay attention to safety, various laboratory should establish safety rules to cut off the current in the absence of the former, not allowed to touch electrical appliances tested.

3, should be to minimize the impact of environment on the test data, test environment, temperature, humidity and pollution of the surface insulation, has a great influence for the leakage current, high temperatures, humidity, insulation serious pollution of the surface to measure the leakage current value higher than Great.