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Rotary rotor ground protection measurement and calibration method and control protection device

A rotating rotor and rotor grounding technology, which is applied in the direction of measuring devices, grounding resistance measurement, measuring electricity, etc., can solve the problem that the high variation range of ambient temperature affects the action accuracy of the rotating rotor grounding protection, and the maximum working temperature may exceed 90 ℃ and other problems, to eliminate the impact, facilitate program realization, and improve the effect of measurement accuracy

Active Publication Date: 2014-12-17
NR ELECTRIC CO LTD +1
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Problems solved by technology

The ground fault detection circuit of the rotating rotor ground protection is packaged in the rotation detection unit and installed inside the generator. The ambient temperature is high and the range of variation is large. The maximum operating temperature may exceed 90°C, which has a greater impact on the characteristics of the rotor ground protection circuit components. large impact, which in turn affects the action accuracy of the rotating rotor ground fault protection

Method used

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  • Rotary rotor ground protection measurement and calibration method and control protection device
  • Rotary rotor ground protection measurement and calibration method and control protection device
  • Rotary rotor ground protection measurement and calibration method and control protection device

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Embodiment Construction

[0026] In the method for calibrating the accuracy of the grounding protection of the rotating rotor of the present invention, the temperature compensation characteristics of the grounding measurement loop of the rotor are determined in advance through experiments. i ,T i )(i=0,1,...,m-1), m generally takes 3~20, such as figure 2 As shown in the figure T 0 ~T 11 Is the given temperature value, Ke 0 ~ Ke 11 Measure the loop temperature compensation coefficient for the corresponding rotor grounding. After the actual ambient temperature is measured internally, the segmented Lagrange polynomial interpolation method is used to obtain the corresponding temperature compensation coefficient of the rotor grounding measurement loop to reduce interpolation errors, achieve high-precision calibration of the rotor grounding measurement value, and improve the accuracy of the rotating rotor grounding protection.

[0027] The protection system detects the internal ambient temperature of the rotatin...

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Abstract

The invention discloses a rotary rotor ground protection measurement and calibration method and a rotary rotor ground protection measurement and calibration device. The method includes: pre-testing a group of rotor ground measurement circuit temperature compensation coefficients by means of a rotor ground measurement circuit temperature compensation characteristic test, after actual measurement of a current internal environment temperature, adopting a segmented Lagrange polynomial interpolation method to obtain a temperature compensation coefficient corresponding to a rotor ground circuit measurement value at the environment temperature, and correcting the rotor ground circuit measurement value to realize high-precision rotary rotor ground protection.

Description

Technical field [0001] The invention relates to the field of relay protection, in particular to a method for measuring and calibrating a rotating rotor grounding protection and a device adopting the method. Background technique [0002] Brushless excitation means that the rotating rectifier device rotates coaxially with the generator, the main exciter and the auxiliary exciter. After rectification, the excitation current is provided to the generator rotor circuit. The main excitation armature and its rectifier device are coaxial with the generator Rotate to provide excitation current to the generator without any slip ring, phase converter, slip ring, carbon brush and other components, which reduces the amount of daily work and maintenance, improves the operating reliability of the equipment, and avoids carbon powder and carbon brushes. Insulation pollution caused by copper powder on generator windings. For brushless excitation generator sets, there is no need to introduce any ex...

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Application Information

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IPC IPC(8): G01R31/02G01R27/20
Inventor 牟文彪王光吴春年陈俊章良健张琦雪朱晓瑾于海波俞建明刘乐
Owner NR ELECTRIC CO LTD
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