Analysis of Harmonic Transfer Characteristics of a 110 kV Capacitor Voltage Transformer Considering Multi-Source Stray Parameters

ZHOU Yuan; ZHANG Zhong; PENG Xiangyang; LV Jiaqi; FAN Yazhou

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Analysis of Harmonic Transfer Characteristics of a 110 kV Capacitor Voltage Transformer Considering Multi-Source Stray Parameters

POWER CAPACITOR & REACTIVE POWER COMPENSATION

Analysis of Harmonic Transfer Characteristics of a 110 kV Capacitor Voltage Transformer Considering Multi-Source Stray Parameters
考虑多源杂散参数的110 kV电容式电压互感器谐波传递特性分析
1.Guangdong Key Laboratory of Electric Power Equipment Reliability (Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China
2.State Key Laboratory of Power Transmission Equipment Technology (Chongqing University), Chongqing 400044, China
(2026)
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ZHOU Yuan, ZHANG Zhong, PENG Xiangyang, et al. Analysis of Harmonic Transfer Characteristics of a 110 kV Capacitor Voltage Transformer Considering Multi-Source Stray Parameters[J/OL]. Power Capacitor & Reactive Power Compensation, 2026.
DOI：

ZHOU Yuan, ZHANG Zhong, PENG Xiangyang, et al. Analysis of Harmonic Transfer Characteristics of a 110 kV Capacitor Voltage Transformer Considering Multi-Source Stray Parameters[J/OL]. Power Capacitor & Reactive Power Compensation, 2026. DOI：

摘要

针对电容式电压互感器（CVT）在谐波及宽频条件下频率响应不平坦的问题，建立了一种考虑多源杂散参数的110 kV CVT宽频等效电路模型。模型在传统CVT等效电路基础上，引入电容分压器宽频参数、补偿电抗器杂散电容、中间变压器一次和二次绕组对地电容、层间等效电容、绕组间耦合电容以及二次负载参数。采用1 Hz～2 MHz扫频仿真分析了不同杂散参数对CVT频率响应的影响规律。结果表明，补偿电抗器杂散电容和一次侧层间电容对低频及谐波附近峰谷影响较明显；绕组间耦合电容主要改变中频段幅值分布；二次侧杂散电容、电容分压器等效串联电感和负载参数主要影响高频响应。多源杂散参数是影响CVT宽频传递特性的重要因素，建立宽频等效模型时应予以考虑。

Abstract

To analyze the frequency-response characteristics of a capacitor voltage transformer (CVT) under harmonic and broadband voltage conditions

a broadband equivalent circuit model of a 110 kV CVT considering multi-source stray parameters is established. On the basis of the conventional CVT equivalent circuit

the model incorporates the broadband parameters of the capacitive divider

stray capacitance of the compensation reactor

winding-to-ground capacitances of the intermediate transformer

equivalent interlayer capacitances

interwinding coupling capacitance

and secondary burden parameters. A frequency sweep from 1 Hz to 2 MHz is carried out to investigate the influence of different stray parameters on the CVT transfer characteristics. The results show that the stray capacitance of the compensation reactor and the primary-side interlayer capacitance of the intermediate transformer have significant effects on resonance peaks and valleys in the low-frequency and harmonic ranges. The interwinding coupling capacitance mainly changes the amplitude distribution in the middle-frequency range

while the secondary-side stray capacitances

equivalent series inductances of the capacitive divider

and secondary burden mainly affect the high-frequency response. The results indicate that multi-source stray parameters are important factors influencing the broadband transfer characteristics of CVTs and should be considered in broadband equivalent modeling.

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references

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