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Calculation method of temperature of rotor winding of large-size water-turbine generator set

A technology for generator rotors and rotor windings, applied in temperature measurement of moving solids, thermometers, thermometers using electric/magnetic elements that are directly sensitive to heat, etc., can solve problems such as inaccurate temperature calculations, and achieve accurate calculations

Inactive Publication Date: 2013-08-28
NARI TECH CO LTD
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  • Application Information

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Problems solved by technology

Among them, errors in sampling, algorithm, and output links will cause inaccurate temperature calculations, so improving the accuracy of sampling, calculation, and output links is related to accurate measurement of rotor winding temperature

Method used

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  • Calculation method of temperature of rotor winding of large-size water-turbine generator set
  • Calculation method of temperature of rotor winding of large-size water-turbine generator set
  • Calculation method of temperature of rotor winding of large-size water-turbine generator set

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Embodiment Construction

[0030] The present invention will be described in further detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given.

[0031] figure 1 It is a diagram of the relationship between the resistance of the copper conductor and its temperature. It can be seen that at ordinary temperatures (except high temperature and extremely low temperature), the resistance of the copper conductor has a good linear relationship with its temperature, which is approximately a straight line, and its slope depends on the copper conductor. size and structure. The characteristics of the copper material determine that the resistance-temperature characteristic line of any copper conductor passes through figure 1 The point in (-234.5,0). according to figure 1 It can be seen from the relationship diagram that as long as the slope of the rotor winding resistance temperature characteristic line is obtained, and then the resistance va...

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Abstract

The invention discloses a calculation method of a temperature of a rotor winding of a large-size water-turbine generator set. The calculation method comprises the following steps: (1) respectively measuring temperatures of a halting state and a no-load state of the rotor winding of a generator and the rotor winding; and calculating to obtain the temperature of the rotor winding and the linear coefficient of a resistor; (2) sampling to obtain real-time sampling values of exciting voltage and exciting current to obtain a resistance value of the rotor winding; and (3) multiplying a real-time resistance value of the rotor winding by the temperatures of the rotor winding and the linear coefficient of the resistor, and subtracting a zero resistance temperature to obtain the temperature of the rotor winding. According to the calculation method disclosed by the invention, the measurement of rotor voltage and rotor current has a filtering function and a fault-tolerant mechanism; and a linear coefficient calculation method of a rotor resistance and a rotor temperature is optimized and the calculation of the resistance value of the rotor winding is closer to an actual value; meanwhile, influence of the slip ring pressure drop and the bus pressure drop on calculation of rotor temperature are considered to enable the calculation of the resistance value of the rotor winding closer to an actual temperature, so that the accuracy of measuring the temperature of a rotor is improved.

Description

technical field [0001] The invention provides a method for improving the calculation accuracy of the rotor winding resistance. The method optimizes the linear coefficient between the rotor winding resistance and temperature, reasonably selects the measurement point, considers the influencing factors of the external circuit, and calculates the rotor voltage and rotor current. It is realized by filtering and fault-tolerant sampling, and belongs to the field of electrotechnical technology. Background technique [0002] The temperature of the rotor of a large generator is an important monitoring parameter for the safe operation of the generator. The measurement methods include direct measurement and indirect measurement. The results obtained by the direct measurement method are relatively reliable, but it is difficult to realize, and it is difficult for the equipment to operate safely and maintain. Added new difficulty. The basic principle of the indirect measurement method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/16
CPCG01K13/08G01K7/16G01K2217/00
Inventor 许其品袁亚洲刘光权耿敏彪朱宏超徐其质安宁王亚婧万泉仇志刚
Owner NARI TECH CO LTD
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