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Electronic veltage transformer of capacitor or resistance series hollow coil

A technology of voltage transformers and air-core coils, applied in the direction of voltage/current isolation, etc., can solve the problems of equipment damage, personal safety, susceptibility to temperature, and potential safety hazards, and achieve improved measurement accuracy, large dynamic range, and transient Good effect

Inactive Publication Date: 2010-01-06
MILUO TONGBIAN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of electronic voltage transformer with capacitors or resistors connected in series with hollow coils is that it is easily affected by temperature, especially the secondary side voltage is directly coupled with the primary side high voltage, there is no electrical isolation, it is susceptible to interference, and there are potential safety hazards , may cause equipment damage and personal safety accidents

Method used

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  • Electronic veltage transformer of capacitor or resistance series hollow coil
  • Electronic veltage transformer of capacitor or resistance series hollow coil
  • Electronic veltage transformer of capacitor or resistance series hollow coil

Examples

Experimental program
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Embodiment Construction

[0023] see figure 1 , used for medium and high voltage voltage transformers, 1 is a high voltage lead, directly connected to the high voltage bus terminal; the primary coil of the air-core coil current sensor 2 is connected in series with the precision capacitor 3 to form the primary side of the voltage sensor, and the primary side of the air-core coil current sensor 2 The secondary coil is used as the output end of the voltage sensor; the voltage sensor is also provided with an inner insulating layer, a shielding layer and an outer insulating layer in sequence. A primary current that changes proportionally to the measured primary voltage is generated in the primary circuit, and passes through the primary side of the air-core coil 2, and its secondary coil induces a secondary induced voltage signal that changes proportionally to the primary current, that is, it reflects the primary voltage proportionally. Changes in the measured voltage. The same principle, the voltage transf...

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Abstract

An electronic voltage transformer with capacity or resistance being series-connected to hollow coil is prepared as forming primary coil by hollow coil, series-connecting capacity or resistance in primary coil and connecting output end of secondary coil to induction voltage signal processing circuit.

Description

technical field [0001] The invention relates to a voltage transformer, in particular to an electronic voltage transformer in which capacitors or resistors are connected in series with hollow coils for voltage measurement of various voltage levels in power systems. Background technique [0002] Existing voltage transformers are mainly electromagnetic voltage transformers and capacitive voltage transformers. In recent years, relatively advanced optical voltage transformers (OVT) and electronic voltage transformers based on capacitors or resistors divided by capacitors or resistors connected in series with hollow coils have also appeared at home and abroad. [0003] The insulation structure of electromagnetic voltage transformer is becoming more and more complicated, the body is large and heavy, the cost is high, ferromagnetic resonance may occur, and the measurement accuracy of small signals is low. The capacitive voltage transformer has a poor transient response and is prone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18
Inventor 周有庆龚伟
Owner MILUO TONGBIAN ELECTRIC CO LTD
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