Three-phase voltage transformer and three-phase influence voltage compensation method based on d_dot principle
A three-phase voltage and transformer technology, used in voltage/current isolation, measuring current/voltage, instruments, etc., can solve problems such as insulation to be improved, complex structure, etc., achieve good dynamic range and transient characteristics, small size , to ensure the effect of measurement security
Active Publication Date: 2016-04-13
重庆康菲达信息技术有限公司
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Problems solved by technology
[0005] However, the current D_dot sensor structure generally has problems such as complex structure and insulation to be improved.
Method used
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Embodiment Construction
[0030] Such as figure 1 Shown is a schematic diagram of the principle of the D_dot sensor, which encapsulates a metal conductor 1 with high conductivity in an insulator 2 to form the simplest D_dot sensor, where For the electric field strength of the measured point, make a closed Gaussian surface 4 on the surface of the metal conductor, and use Gaussian law on it to get:
[0031] (Formula 1).
[0032] In the formula (1), q is the induced charge on the metal conductor 1 in the closed Gaussian surface 4, A eq is the equivalent area of the sensor, which is related to the shape and structure of the metal conductor 1 in the sensor and the angle between the Gaussian surface and the direction of the electric field intensity vector.
[0033] When the metal conductor 1 is connected to the grounding matching resistor R through the cable 3, the charge in the metal conductor 1 moves to form a current and creates a voltage drop across the ground matching resistor R:
[0034] ...
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The invention provides a three-phase voltage transformer based on a D_dot principle and a three-phase influence voltage compensating method. The three-phase voltage transformer comprises an annular electrode I, an annular electrode II, an insulating support and a grounding capacitor. The insulating support comprises a semicircular support body I, a semicircular support body II and a supporting arm. The supporting arm is arranged on the side wall of the semicircular support body I and the side wall of the semicircular support body II, and the semicircular support body I and the semicircular support body II are concentrically arranged to form a through hole used for allowing a measured conductor to penetrate through. The annular electrode I and the annular electrode II are concentrically arranged and are embedded into the semicircular support body I and the semicircular support body II respectively. The annular electrode I and the annular electrode II are in series connection with the grounding capacitor and the ground through wires. The three-phase voltage transformer has the advantages of being small in size, simple in structure, good in insulating property, safe to measure and the like. The three-phase influence voltage compensating method analyzes the mutual influence among three phase lines in the measuring process, so that a measured value close to the real situation is obtained.
Description
technical field [0001] The invention relates to the technical field of power equipment, in particular to a three-phase voltage transformer based on the D_dot principle and a three-phase influence voltage compensation method. Background technique [0002] Traditional voltage transformers include: electromagnetic voltage transformers, capacitive voltage transformers and electronic sensors, etc. Among them, the electromagnetic voltage transformer has problems such as difficult insulation and easy to generate ferromagnetic resonance. Among them, the capacitive voltage transformer has poor transient response characteristics due to many energy storage components, and it is necessary to install a damping device in the secondary circuit to improve the transient. Response characteristics, among which electronic sensors have problems such as large measurement errors. [0003] Therefore, the voltage sensor based on the D_dot principle (abbreviation: D_dot sensor) uses the principle of...
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IPC IPC(8): G01R19/00G01R15/18
Inventor 汪金刚白云洁范禹邑朱丽云
Owner 重庆康菲达信息技术有限公司