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Method for measuring high voltage by current method and its device

A current method and voltage measurement technology, applied in the direction of measurement device, measurement of current/voltage, measurement of electrical variables, etc., can solve the problems of unstable performance, unstable measurement error, large influence of voltage divider, etc., to save installation space, The effect of reducing measurement costs and saving production materials

Active Publication Date: 2009-05-06
淄博计保互感器研究所(有限公司)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (2) In order to solve the above problems, a method of voltage sampling using optical fiber transformers, electronic transformers, capacitive voltage dividers, and resistor voltage dividers has emerged, which solves some problems with electromagnetic transformers, but due to its The measurement is based on the principle of voltage divider: U 1 / U 2 = Z 1 / Z 2 (where Z is the partial voltage impedance), affected by many factors such as resistance stability, distributed capacitance, temperature change, corona, and ground voltage, there are many problems in its measurement accuracy and stability of detection parameters.
[0018] D. The divided voltage is greatly affected by the distributed capacitance to the ground, the measurement error is unstable, and it cannot be well adapted to the power system with various wiring schemes;
[0019] E. The performance is unstable under outdoor conditions, and the test run effect is not ideal
[0020] Therefore, the promotion and application of its products are not satisfactory

Method used

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  • Method for measuring high voltage by current method and its device
  • Method for measuring high voltage by current method and its device
  • Method for measuring high voltage by current method and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Perform voltage measurement on single-phase high-voltage circuits:

[0075] use figure 2 In the circuit shown, the output terminal of the current sensor CS is connected to the voltage signal input terminals 3 and 4 of the voltage measurement, metering or protection device after high / low voltage isolation.

[0076] The high / low voltage isolation unit can choose photoelectric, optical fiber, electromagnetic, gas-insulated, oil-insulated or solid-insulated isolation devices.

[0077] The high / low voltage isolation unit is used to process the collected voltage signals, which can meet the requirements of high and low voltage isolation, electromagnetic shielding (electromagnetic compatibility), the ratio difference of measurement accuracy, the angle difference and the sampling signal of the voltage protection circuit at the same time. .

[0078] Since high / low voltage isolation is an existing technology, it will not be described here.

[0079] The rest is the same figure 1 .

Embodiment 2

[0081] Phase voltage measurement for three-phase three-wire lines:

[0082] use image 3 The circuit shown uses two sets of high-voltage sensors to be connected between the A-B and B-C phases of the power supply to measure the phase-to-phase voltage, and output a standard-level voltage detection signal through the V-v connection.

[0083] For the sake of simplicity of the drawing, the high / low voltage isolation unit is not shown in the figure (the same below).

[0084] The rest is the same figure 1 Or Example 1.

Embodiment 3

[0086] Perform voltage measurement on three-phase three-wire lines:

[0087] use Figure 4 The circuit shown uses three sets of high-voltage sensors to be connected between the A, B, and C phases of the power supply and the center point O to measure the voltage, and connect to the voltage measurement, metering, monitoring or protection device by Yy wiring. .

[0088] The rest is the same figure 1 Or Example 1.

[0089] In addition, a zero-sequence or open delta wiring method can also be used to connect to the protection device. Since the above-mentioned wiring method, working principle and high-voltage protection device are existing technologies, they will not be described here.

[0090] Figure 5 , 6 , 7 are the outline drawings of the products with single-phase, three-phase V-v wiring and three-phase Y-y wiring.

[0091] by Figure 5 , 6 As shown in 7, it can be seen that using the above technical solution, the primary and secondary impedance, current transformer and high / low vo...

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Abstract

A method of measuring high voltage with current belongs to the area of high-pressure measurement. A primary impedance is parellelly connected with the voltage terminal to be measured, the current I1 flowing in the impedance is measured by a current-sensing device, the current I1 can be transferred to current i2 and then loaded into a secondary impedance, a standard signal u2 which is proportional to the voltage to be measured is generated in the two ends of the secondary impedance, u2 is the voltage signal to be measured and sent to the input of high-voltage measurement, metering, monitoring or protecting equipment for the measurement. The invention provides a high voltage measuring apparatus based on the method too. Measuring the high voltage with current method overcomes many frauds using electromagnetic potential transformer, the high voltage measurement of three-phase three wire systems or three-phase four wire system can be measured, it can be widely used in fields of high voltage measurement that provides voltage signal for high-voltage measurement, electrical energy metering, monitoring or protecting equipment.

Description

Technical field [0001] The invention belongs to the field of high-voltage measurement, and in particular relates to a method and device for measuring high-voltage voltage by detecting the magnitude of the current flowing through its designated load. Background technique [0002] At present, there are two main methods for sampling the high-voltage signals required by the high-voltage system's voltage measurement, electric energy metering, monitoring or protection devices in the domestic, domestic and foreign power systems: [0003] (1) Use electromagnetic voltage transformer (abbreviated as PT, the same below) to transform high voltage into standard low voltage (100 or 100 / ), and then measure its voltage, use it for protection devices or connect it to an electric energy meter for electric energy measurement, which requires a higher output capacity of the transformer; [0004] (2) With the improvement of power system automation and the large-scale application of microcomputer pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R19/02G01R15/14G01R15/22G01R15/20G01R13/02G01R11/00
Inventor 荣博徐丙垠苗军荣潇
Owner 淄博计保互感器研究所(有限公司)
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