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Insulating medium interface leakage current measuring system and method
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A technology of insulating medium and leakage current, applied in the field of high voltage and insulation
Pending Publication Date: 2021-04-02
JIANGSU SHENMA ELECTRIC CO LTD
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[0002] The interface problem of composite insulators has increasingly become an important factor affecting its safe operation. Insulators are non-conductive, but in fact there are almost no insulating materials that are absolutely non-conductive
Any kind of insulating material, when a voltage is applied across its two ends, there will always be a certain current passing through. The active component of this current is called leakage current, and the current measurement methods for the conductivity of insulating media are mostly focused on conductor conductivity and surface leakage current. The measurement of the leakage current at the interface between insulating media has not been involved
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Embodiment 1
[0021] Such as figure 1 with figure 2 As shown, the present embodiment provides an insulating medium interface leakage current measurement system 100, including a high-voltage power supply 11, a protective resistor 12, a switch 13, a test sample 14, a current detection unit 15, a shielding device 16 and a wire 17, and the test sample 14 includes A first insulating medium 141 , a second insulating medium 142 , a high voltage electrode 143 , a measuring electrode 144 and a shielding electrode 145 .
[0022] In this embodiment, the test sample 14 is a sheet-shaped test block with the same material and connection method as the composite insulator. The composite insulator is an insulating control with supporting and insulating functions, and its main structure is a hollow or solidcomposite material mandrel. The surface is injected with rubber material. In this embodiment, the first insulating medium 141 is a sheet-shaped test block made of glass fiber reinforced plastic, herein...
Embodiment 2
[0051] Such as image 3 with Figure 4 As shown, this embodiment provides an insulating medium interface leakage current measurement system 200. The difference from Embodiment 1 is that the switch 23 of this embodiment is a third-level switch 23, including a grounding gear 233. When the third-level switch 23 When it is at the ground position 233 , the measurement system 200 is grounded, which can release the residual charge of the high voltage power supply 21 and other terminals, ensuring the stability of the measurement system 200 .
[0052] In this embodiment, the shielding electrode 245, the shielding device 26, the current detection unit 25, and the high-voltage power supply 21 are all grounded to protect the circuit and shield the influence of other charges.
[0053] In this embodiment, the test sample 24 includes two high-voltage electrodes 243 of the same size and two measuring electrodes 244 of the same size. The two measuring electrodes 244 are arranged symmetricall...
Embodiment 3
[0059] This embodiment provides a method for measuring the leakage current of the insulating medium interface by using the insulating medium interface leakage current measurement system 100, refer to figure 1 , including the following steps:
[0060] Step a: preparing test sample 14;
[0061] Step b: connecting the insulating medium interface leakage current measurement system 100;
[0062] Step c: During the test, place the switch 13 in the measurement position 131, pressurize through the high-voltage power supply 11, and use the current detection unit 15 to measure the leakage current after applying the voltage;
[0063] Step d: After the test is over, put the switch 13 in the neutral position 132, and turn off the high voltage power supply 11. Putting the switch 13 in the neutral position 132 first, and then turning off the high-voltage power supply 11 can form a buffer and effectively protect the circuit.
[0064] Specifically, in this embodiment, the preparation of the...
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Abstract
The invention discloses an insulating medium interface leakage current measuring system. The system comprises a high-voltage power supply, a current detection unit, a switch, a test sample and a wire,wherein the test sample comprises a first insulating medium, a second insulating medium, at least one high-voltageelectrode and at least one measuring electrode, the first insulating medium and thesecond insulating medium are bonded to form an interface, the high-voltageelectrode and the measuring electrode are located on the interface and used for measuring leakage current of the interface, and the high-voltage electrode and the measuring electrode are not electrically connected; the invention further discloses an insulating medium interface leakage current measuring method, the measuringsystem is adopted for measurement, and the insulating medium interface leakage current measuring system and method adopt the mode that at least two electrodes which are not electrically connected arearranged between two insulating media of a test sample in the sample preparation process. The leakage current of the interface is measured through the current detection unit, so that the electrical performance of the connection interface of the two insulating media can be better evaluated.
Description
technical field [0001] The present application relates to the technical field of high voltage and insulation, in particular to a system and method for measuring an insulating medium interface leakage current. Background technique [0002] The interface problem of composite insulators has increasingly become an important factor affecting its safe operation. Insulators are non-conductive, but in fact there are almost no insulating materials that are absolutely non-conductive. Any kind of insulating material, when a voltage is applied across its two ends, there will always be a certain current passing through. The active component of this current is called leakage current, and the current measurement methods for the conductivity of insulating media are mostly focused on conductor conductivity and surface leakage current. The measurement of the leakage current at the interface between insulating media has not been involved. The existence of the interface leads to a more complex...
Claims
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