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High-voltage cable frequency conversion series resonance voltage withstand debugging method

A frequency conversion series resonance, high-voltage cable technology, applied in the direction of measuring electrical variables, measuring electricity, testing dielectric strength, etc., can solve the problems of not being suitable for field use, not correctly reflecting the insulation performance of equipment, and ordinary power frequency test equipment. Achieve the effect of saving manpower and material resources

Inactive Publication Date: 2016-05-04
TIANJIN 20 CONSTR
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Problems solved by technology

[0003] In recent years, high-voltage cross-linked cables have been widely used and the capacity and length of cables have continued to rise. The previous DC withstand voltage test cannot correctly reflect the actual insulation performance of the above equipment, and the ordinary power frequency test equipment as the best test method is used in large In the case of limited capacity, it is extremely bulky and not suitable for on-site use

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Embodiment Construction

[0033] A debugging method for frequency conversion series resonance withstand voltage of a high-voltage cable according to the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0034] The main equipment of the variable frequency series resonant withstand voltage device are: variable frequency power supply, excitation transformer, resonant reactor, voltage divider and overvoltage protector (or lightning arrester). The working principle diagram is as follows: figure 1 shown.

[0035] The working mechanism of frequency conversion series resonance withstand voltage is to use the principle of LC oscillation circuit, and the equivalent circuit circuit of series resonance circuit is as follows: figure 2 shown. in:

[0036] U: It is the output voltage after the high-voltage winding of the excitation transformer is connected in series and parallel, which can be changed continuously under the control of the variab...

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Abstract

The invention relates to a high-voltage cable frequency conversion series resonance voltage withstand debugging method. The method includes the following steps of: preparation work: a user should be familiar with the use of a frequency conversion series resonance voltage withstand device, data are all in readiness, the grounding of a system is excellent, high-voltage cable phase sequence calibration is carried out, and a high-voltage cable insulation test is carried out; the determination of the capacitance value of a tested cable; the selection of reactors: whether reactors are connected in a series-parallel combined manner is determined based on test voltage and a current value, and the capacity range of the tested cable is determined based on the inductance of the reactors and system work frequency; the selection of power source capacity: a power source and the current capacity of an exciting transformer are selected according to the calculated current value of the tested cable; and voltage withstand testing: a high-voltage cable insulation test is carried out, a test result is compared with a high-voltage cable insulation test result, and the difference value of the test result and the high-voltage cable insulation test result is in a set range. The method of the invention is fast and clear; the method is suitable for high-voltage cable frequency conversion series resonance voltage withstand debugging of various modes and is also suitable for resonance voltage withstand debugging of transformers, motors, and the like. With the method adopted, a resonance point can be found out fast.

Description

technical field [0001] The invention relates to a high-voltage cable frequency conversion resonance withstand voltage debugging. In particular, it relates to a debugging method for frequency conversion series resonance withstand voltage of high-voltage cables. Background technique [0002] In the DC withstand voltage test of XLPE cables, due to the space charge effect, the actual electric field strength in the insulation can be several times higher than the working electric field strength of the cable insulation. Even if the XLPE insulated cable passes the DC test without breakdown, it will cause serious damage to the insulation. Secondly, because the applied DC voltage field strength distribution is different from the operating AC voltage field strength distribution. The DC test can't really simulate the overvoltage that the cable bears in the running state, and can effectively find the defects of the cable and the cable joint itself and the construction process. Therefo...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 陈吉林于志强杨明张少强李刚管宇
Owner TIANJIN 20 CONSTR
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