An Estimation Method for the Optimal Compensation Capacitance of Cable Up-current Test System
A technology for compensating capacitors and test systems, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficulty in compensating capacitance calculation, power consumption, complexity, etc., to save power consumption, time, and input current. Effect
Active Publication Date: 2018-04-13
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
Due to the complexity of the system, it is difficult to calculate the size of the compensation capacitor. The previous method is to try and make up through experiments. This method is very time-consuming and power-consuming.
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Embodiment 1
[0032] In view of the problem that the size of the existing compensation capacitor cannot be calculated, this embodiment proposes a method for estimating the optimal compensation capacitance of the cable up-current test system, so that the optimal up-current test system can be directly estimated without using the trial and error method. Compensation capacitor to ensure the safe operation of equipment. This method will be described in detail below with reference to the drawings.
[0033] 1. See figure 1 The cable upflow test system shown. The system is the same as the existing system. Connect the power supply, voltage regulator, voltage regulator, current booster, and cables in sequence, and merge any compensation capacitor at the booster end to ensure that the wiring is correct. The power supply is a 380V three-phase power supply, the voltage regulator is automatically adjusted by the PLC control cabinet, and the cable is a 110kV high-voltage single-core cable.
[0034] 2. Set t...
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The invention discloses a method for estimating the optimal compensation capacitance of a cable boosting test system. The steps of the method are: connecting a power supply, a voltage stabilizer, a voltage regulator, a current booster, and a cable in sequence, and the current booster Incorporate any compensation capacitor at the terminal; obtain the effective value of the cable current Ib, the effective value of the voltage at the cable end Ub, and the conversion ratio k of the current booster; do an equivalent circuit for the input port of the current booster, and the part of the current booster is equivalent to an inductive Impedance, calculate the optimal compensation capacitance. The method of the invention can estimate the optimal compensation capacitance of the boosting test system, improve the power factor of the system, can well limit the input current of the voltage regulator, ensure the safe operation of the equipment, and avoid the frequent operation of the trial and error method at the same time The process saves a lot of time and saves power consumption.
Description
Technical field [0001] The invention relates to the research field of large current up-current systems, in particular to a method for estimating the optimal compensation capacitance of a cable up-current test system. Background technique [0002] Large-current up-current systems are mostly used in various places that require large current for equipment debugging. Generally, they are designed according to the electrical equipment test needs of power departments, industrial and mining enterprises, and scientific research institutions, including electrical equipment current load tests, temperature rise tests, etc. With the development of cities, cables have gradually replaced overhead lines as the main equipment for urban power transmission. The structure of the cable is different from that of the overhead line. The copper core of the power transmission is wrapped with multiple layers of materials to protect the safety of power transmission. At the same time, the problem of cable he...
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IPC IPC(8): G01R31/00
Inventor 刘刚王振华
Owner SOUTH CHINA UNIV OF TECH