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High-stability dielectric loss factor standard device

A dielectric loss factor and high stability technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve problems such as unsatisfactory circuits, and achieve the goals of avoiding stability and accuracy, compact structure, eliminating resistance and accuracy effect of influence

Inactive Publication Date: 2018-01-23
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The 3MΩ resistor with an accuracy of 0.1% is usually custom-made, and the voltage on the resistor is close to 1000V, which cannot meet the requirements of the circuit working at a low potential.

Method used

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  • High-stability dielectric loss factor standard device
  • High-stability dielectric loss factor standard device
  • High-stability dielectric loss factor standard device

Examples

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Embodiment

[0025] Taking the dielectric loss factor standard device with 11 sub-units to simulate 30 dielectric loss levels as an example, define the shunt capacitor 4 as C2, the standard capacitor 5 as C1, and the resistors 6 in the 11 sub-units as R1 . The equivalent resistance after gear combination is the dielectric loss simulation resistance R. In this embodiment, the standard capacitor C1=100PF, the shunt capacitor C2=1800PF, the standard value of the dielectric loss is 0.000%, and the measurement range of the dielectric loss is 0.0005%-10.00% (30 gears in total).

[0026] like figure 2 As shown, the CX terminal is connected to the core wire of the dielectric loss meter test line. The equivalent circuit is that the dielectric loss simulation resistor R is connected in parallel with the shunt capacitor C2. The resistance value calculation expression of the dielectric loss simulation resistor R is:

[0027] (1)

[0028] (2)

[0029] Among them, k is the shunt coefficient, ...

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Abstract

The invention discloses a high-stability dielectric loss factor standard device and relates to the technical field of dielectric loss measuring equipment in electrical equipment. The high-stability dielectric loss factor standard device adopts a capacitor shunt type RC dielectric loss model; and through parallel connection between a bridging capacitor and a dielectric loss simulation resistor, resistance and heating power of the dielectric loss simulation resistor are reduced, thereby reducing resistance and power of a resistor in each gear subunit, facilitating model selection of the resistorwithout customization, and meanwhile, eliminating influence of heating of the resistor on the resistance and precision, and preventing influencing stability and precision of the test data. The standard device realizes simulation of dielectric loss value gears larger than the number of gear subunits by controlling the gear subunits to carry out gear combination, thereby greatly reducing size and weight of the dielectric loss factor standard device; and the dielectric loss factor standard device is allowed to be more compact in structure, more reliable and intelligent in performance, and more suitable for on-site calibration of a first production line.

Description

technical field [0001] The invention belongs to the technical field of dielectric loss measuring equipment in electrical equipment, and in particular relates to a highly stable dielectric loss factor standard device. Background technique [0002] The insulation structure of electrical equipment is composed of various insulating media. Due to the conductance of the media, the friction of the dipole rotation in the polar media and the air gap discharge in the media, the media (or the entire insulation) under high voltage Structure) is lossy, and this loss becomes dielectric loss, which is an important indicator of the insulation performance of electrical equipment. Many accidents in the power system are caused by insulation problems. In order to ensure the safe operation of the power system, an insulation test must be carried out, and the dielectric loss measurement test is a highly sensitive insulation detection test. The dielectric loss factor standard is an automatic instr...

Claims

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Application Information

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IPC IPC(8): G01R27/26
Inventor 吕泽承吴秋莉朱时阳赵坚
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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