Method and device for measuring insulation resistance of metalized film capacitor under high field strength

A technology of insulation resistance measurement and metallized film, which is applied in measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as limited measurement voltage, insufficient withstand voltage time, and unstable insulation resistance measurement. Achieve the effects of good measurement repeatability, solving inaccurate measurement, and simple test methods

Active Publication Date: 2012-05-02
HUAZHONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

At present, conventional insulation resistance measuring instruments have problems such as limited measurement voltage, insufficient withstand voltage time and unstable...

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  • Method and device for measuring insulation resistance of metalized film capacitor under high field strength
  • Method and device for measuring insulation resistance of metalized film capacitor under high field strength
  • Method and device for measuring insulation resistance of metalized film capacitor under high field strength

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Embodiment Construction

[0018] The present invention is specifically described below with reference to the accompanying drawings and examples.

[0019] Such as figure 1 As shown, the measuring circuit of the present invention includes: a DC high-voltage withstand voltage instrument, which is used to provide a stable DC high voltage to the measured equipment; a megohm-level sampling resistor (R S ), used to obtain the capacitor leakage current under DC high voltage; DC high voltage divider, used to measure the output voltage (U 0 ); Capacitance measuring instrument, is used for measuring the electric capacity of metallized film capacitor; High voltage probe, is used for measuring the voltage on sampling resistance (U S ). In order to eliminate the influence of the surface current of the capacitor on the measurement of the insulation resistance, the surface of the capacitor is grounded through a wire, and the surface current is introduced into the ground to prevent the surface current of the capacito...

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Abstract

The invention discloses a method and a device for measuring insulation resistance of a metalized film capacitor. The method comprises the following steps: placing the capacitor in an environment with constant temperature and humidity; serially connecting a mega-ohm level sampling resistor RS with the capacitor; applying direct-current high voltage to the capacitor and the sampling resistor; and calculating the insulation resistance of the metalized film capacitor under high field strength according to an intrinsic standoff ratio of the sampling resistor and the capacitor under the direct-current high voltage. The invention also provides the device for realizing the method, which mainly comprises a constant temperature humidity chamber, a capacitance measuring meter, a direct current high voltage resistance meter, a mega-ohm level sampling resistor, a direct current high voltage bleeder and a high voltage probe. The device can be used for accurately measuring the insulation resistance of the metalized film capacitor under the high field strength. The defects of a conventional insulation resistance measuring meter that the size of output voltage is limited, a voltage-resistance time is insufficient, the measurement of the insulation resistance is unstable, and the like, are overcome.

Description

technical field [0001] The invention belongs to the field of resistance measurement, in particular to a method and device for measuring the insulation resistance of metallized film capacitors, which are suitable for measuring the insulation resistance of large-capacity capacitors under constant temperature, constant humidity and high electric field strength. Background technique [0002] The existence of leakage current of metallized film capacitors under high field strength is an important factor affecting the performance of energy storage capacitors in pulse power supply systems, and insulation resistance is a basic electrical parameter reflecting leakage. [0003] Insulation resistance is the ratio of the DC voltage applied between two conductors on an insulator to the leakage current flowing through the insulator. Under a certain humidity condition, when a DC voltage is applied to the insulating material, the following currents will be generated inside and on the surface...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 李化林福昌陈耀红李智威吕霏章妙刘德
Owner HUAZHONG UNIV OF SCI & TECH
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