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Novel high-pressure frequency variator low energy-consumption load testing method

A high-voltage frequency converter and load test technology, which is applied in the direction of instrumentation, power supply testing, and measurement of electrical variables, can solve problems such as low reliability and safety, complex test systems, and difficult control, and achieve simple control, simple test systems, and High practical effect

Inactive Publication Date: 2007-06-13
HUBEI SANHUAN DEV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the above two schemes can meet various test requirements, the test system is complex, difficult to control, low in reliability and safety, and high in cost

Method used

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  • Novel high-pressure frequency variator low energy-consumption load testing method
  • Novel high-pressure frequency variator low energy-consumption load testing method
  • Novel high-pressure frequency variator low energy-consumption load testing method

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Embodiment Construction

[0024] The working principle of the present invention will be further described below in conjunction with the accompanying drawings and unit embodiments.

[0025] As shown in Fig. 1 test principle diagram of the present invention. The busbar 1 of the distribution network is connected to the frequency converter 3 through the isolation transformer 2, and its output end is connected in parallel with the busbar 1 after the resistive load 4 is connected in series. It is determined by the voltage of the resistor in the resistive load, because when the unit output voltage and phase are consistent with the input AC voltage, the active power consumption of the system is theoretically 0, and the resistor voltage drop should also be 0 theoretically, but due to the existence of frequency conversion The loss of the resistor, the resistance voltage drop should be a value close to 0. In fact, finding its minimum value means that the output and input AC are consistent in size and phase. Afte...

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Abstract

The invention relates to a new type high voltage converter low energy consumption loading test method that includes the following steps: connects power network bus to converter through transformer, and the output end of converter connecting to bus after connecting inductive load, connecting voltage transformer and current transformer between converter and inductive load; adjusting the output amplitude and phase of converter, testing the voltage of resistance from inductive load to find the minimum, altering output pulse or modulation signal of PLC to control system current and realizing working state test in different current working state unit, the system current would be sent to PLC through current transformer. The invention has the following advantages and effects: it could be realized without motor; the control would be easy to realize; the test system is safe and reliable; and the power consumption of the entire system is low.

Description

technical field [0001] The invention belongs to the technical field of AC transmission speed system control, and in particular relates to a low-energy load test method of a high-voltage frequency conversion speed regulation system. Background technique [0002] With the rapid development of modern industry, high-voltage motors are used more and more widely. They are the main driving force in industrial and mining enterprises. In large and medium-sized factories and mines in metallurgy, steel, chemical industry, water treatment and other industries, it is necessary to drive fans, pumps Classes, compressors and other high-power mechanical equipment. Because the traditional transmission system is composed of "motor-working machinery", it causes a lot of waste of energy and reduces the life of equipment. Therefore, high-voltage frequency converters with high efficiency and energy saving have been widely used in modern transmission systems. In the production process of high-volt...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/40
Inventor 查晓明毕平劲王宏英
Owner HUBEI SANHUAN DEV
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