Design of DC Composite Electric Field Measurement Structure Based on Vibratory Sensor

doi:10.11930/j.issn.1004-9649.202207008

Abstract

Abstract:

The measurement accuracy of the synthetic electric field of high-voltage DC lines has an important influence on the electromagnetic environment assessment, which is directly related to the environmental protection acceptance of related projects. At present, the most commonly used synthetic field measuring equipment is the rotating field mill tester, whose sensor adopts the structure of rapidly rotating rotor and the mode of carbon brush contacting and grounding. The intermittent contact during high-speed rotation makes the carbon brush grounding unreliable, and the ion accumulation on the rotor leads to the change of electric field and ion current distribution near the measuring point, thus making the measurement results quite different from the actual electric field. In order to solve the inherent defects of the existing grounding mode and rotating structure, based on the measuring principle and structural arrangement of field mill, this paper designs a horizontal reciprocating synthetic field measuring anti-wear vibration sensing mechanism, puts forward the size and arrangement of shielding and induction plates, deduces the sinusoidal relationship between the synthetic electric field and the induced current, draws the modulation waveform of the induced signal, analyzes the amplitude and phase relationship between the synthetic field and the ion flow field, and determines the rotating speed of the rotating motor to be 4 800 r/min and frequency 80 Hz through the limit value of wind speed measurement condition. The results show that the stator plate grounding of the horizontal vibration structure eliminates the accumulation and distortion of ion current; the connection of micro ball guide sleeve can effectively reduce mechanical wear; and the sensor has good linearity, which can meet the requirements of field measurement.

Key words: field mill, intermittent contact, horizontal reciprocating motion, vibration sensing mechanism, ball guide sleeve, mechanical wear

Guangzhou ZHANG, Shubo FANG, Zhenyu ZHANG, Zhihui FENG, Qing HAN. Design of DC Composite Electric Field Measurement Structure Based on Vibratory Sensor[J]. Electric Power, 2023, 56(11): 151-159.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202207008

https://www.electricpower.com.cn/EN/Y2023/V56/I11/151

Figures/Tables 19

Fig.1 Schematic diagram of rotary electric field sensor (field mill)

Fig.2 Sensor area change and induced signal waveform

Fig.3 Structure of vibratory sensor

Fig.4 Motion structure of vibratory electric field sensor

Fig.5 Anti-wear structure

Fig.6 Schematic diagram of motion adjustment structure of vibratory electric field sensor

Fig.7 Signal waveform of i0

Fig.8 Signal processing circuit

Fig.9 Amplified waveform signal

Fig.10 Polarity judgment circuit

Fig.11 Relationship between ion current electric field and DC electrostatic field

Table 1 Calibration results of DC synthetic field measuring sensor 单位：kV

实际值	测量值	绝对误差	实际值	测量值	绝对误差
15	14.9454	0.0546	–2	–1.9764	–0.0236
10	9.9276	0.0724	–3	–2.9778	–0.0222
5	5.0120	–0.0120	–5	–4.9788	–0.0212
3	2.9306	0.0694	–10	–10.0708	0.0708
2	1.9967	0.0033	–15	–15.0691	0.0691

Fig.12 Calibration of vibratory sensor

Fig.13 Analysis model of shell electric field distortion

Fig.14 Electric field distribution outside the upper surface of the equipment

Fig.15 The electric field distribution along the diagonal line on the surface of the device shell

Table 2 Comparison of technical indexes between vibratory equipment and field mill equipment

设备	质量/ g	尺寸（长×宽×高）/ (mm×mm×mm)	灵敏度/ (V·m^–1)	供电时间/ h	通信距离/ m	功耗/ W	准确性误差/ %	离子流影响
场磨式	1350	105×105×125	100	8	＜100	32.8	≥2	较大
振动式	950	125×90×120	10	11.1 h	≥200	22.2	≤1	可忽略

Fig.16 Synthetic field measurement of ±800 kV Qishao DC transmission line

Fig.17 Distribution of DC composite field measured with vibratory equipment and field mill equipment

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