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Leakage Current Tester

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产品名称: Leakage Current Tester
产品型号: 2675
产品展商: 其他品牌
产品文档: 无相关文档

简单介绍

Leakage Current Tester Leakage current is the applied voltage in the absence of fault cases, the electrical insulation in the metal parts with each other


Leakage Current Tester  的详细介绍

Leakage Current Tester

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.

Main technical specifications

Type

2675A

2675B

2675C

Test voltage(AC)

0 to 250V±5%

0 to 250V±5%

0 to 250V±5%

Leakage current(AC)

0 to 2/20mA±5%

0 to 2/20mA±5%

0 to 2/20mA±5%

Output power

500VA

1000VA

2000VA

Timing(s)

0 to  99s,manual control

Alarm Threshold

0 to 20mA, continuously adjustable

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