CN-121499882-B - Direct-current ultra-high voltage measuring sensor

CN121499882BCN 121499882 BCN121499882 BCN 121499882BCN-121499882-B

Abstract

The invention discloses a direct current ultra-high voltage measurement sensor which comprises a detection electrode, a shielding shell, an insulating layer, an ion flow guide electrode and a core sensitive element, wherein an installation space is arranged in the shielding shell, the core sensitive element is arranged in the installation space, an induction space is arranged on the outer side of the shielding shell, the detection electrode, the insulating layer and the ion flow guide electrode are arranged in the induction space, a pair of detection electrodes are correspondingly arranged on two sides of the induction space, one end of each detection electrode is connected with the shielding shell through the insulating layer, the other end of each detection electrode is connected with the ion flow guide electrode through the insulating layer, the ion flow guide electrode and a pair of detection electrodes are partially enclosed to form an induction space, the ion flow guide electrode and the ion flow direction are opposite to each other and receive ion flow, and the core sensitive element is connected with the detection electrodes through a wire. The sensor ensures the stability and reliability of the sensor in long-term operation under the ultra-high voltage/ultra-high voltage direct current environment.

Inventors

XIA GULIN
LU WENHAO
MAO QIANG
PENG CHUNRONG
TAN BINGYUAN
ZHENG FENGJIE
LV JINZHUANG
WEI XIAOXING
GUO JIANBAO
HOU MINGCHUN
SU GUOLEI
CHU JINWEI
LI XIAOXIA
YAN SHUAI
XIAO YUKUN
SUN XIANHE
XIAO DALI
ZHANG XIAOBO
WU ZHENGWEI
Jing Maoheng
XIAO XIONG
LI CHUN
YUAN RUIMIN
REN CHENGLIN
HU CHUN

Assignees

中国南方电网有限责任公司超高压输电公司电力科研院

Dates

Publication Date: 20260505
Application Date: 20260114

Claims (7)

1. A direct current ultra-high voltage measurement sensor, comprising: the device comprises a detection electrode, a shielding shell, an insulating layer, an ion flow guide electrode and a core sensitive element; an installation space is formed in the shielding shell, and the core sensitive element is arranged in the installation space; An induction space is arranged on the outer side of the shielding shell, the detection electrode, the insulating layer and the ion current diversion electrode are arranged in the induction space, and a pair of detection electrodes are correspondingly arranged on two sides of the induction space; One end of the detection electrode is connected with the shielding shell through the insulating layer, the other end of the detection electrode is connected with the ion flow diversion electrode through the insulating layer, the ion flow diversion electrode and a pair of detection electrodes are semi-enclosed to form the induction space, and the ion flow diversion electrode is opposite to the ion flow direction and receives the ion flow; The core sensitive element is connected with the detection electrode through a wire; The voltage measurement sensor further comprises a high-voltage wire, wherein the high-voltage wire is arranged on the outer side of the shielding shell and is in equipotential connection with the shielding shell; The insulating layer comprises a voltage-resistant insulating layer and a common insulating layer, one end of the detection electrode is connected with the shielding shell through the voltage-resistant insulating layer, and the other end of the detection electrode is connected with the ion current diversion electrode through the common insulating layer.
2. The direct current ultra-high voltage measurement sensor according to claim 1, wherein the shield case is provided with a case opening provided as a movable opening and closing opening.
3. The direct current ultra-high voltage measurement sensor according to claim 1, wherein the core sensing element comprises a sensing probe and a receiving port, the sensing probe is connected with the detection electrode through a wire, and the core sensing element is in remote communication connection with a ground control power supply through the receiving port.
4. The direct current extra-high voltage measurement sensor according to claim 3 wherein the core sensing element comprises a plurality of shielding electrodes and a plurality of sensing electrodes, the sensing electrodes being arranged in pairs with the shielding electrodes.
5. The direct current ultra-high voltage measurement sensor according to claim 3, wherein the core sensing element comprises a metal encapsulation housing connected to the sensing probe through a layer of insulating material.
6. The direct current ultra-high voltage measurement sensor according to claim 4, wherein the shielding electrode is provided as a movable electrode.
7. The direct current ultra-high voltage measurement sensor according to claim 6, wherein the sense electrode outputs a sensor signal through an operational amplifier.

Description

Direct-current ultra-high voltage measuring sensor Technical Field The invention relates to the technical field of sensors, in particular to a direct-current ultra-high voltage measuring sensor. Background The reliable voltage measurement is a key for ensuring safe and stable operation in the fields of smart grids, aerospace, industrial production and the like, the traditional electromagnetic voltage transformer in the electric power system has the inherent defects of heavy volume, high cost, poor high-frequency response and the like, particularly in the field of direct-current ultrahigh voltage/extra-high voltage, the huge volume and cost severely restrict the development of the smart grids to the direction of digitalization and informatization, the wide-area deployment requirement of the sensor cannot be met, when the sensor is applied to an ultrahigh-voltage direct-current scene, the direct-current voltage up to megavoltage can ionize ambient air to generate directionally-migrated ion flows, and the ion flows can continuously bombard and adhere to the surface of an induction electrode of the sensor to form charge accumulation difficult to dissipate, so that serious drift is introduced, the long-term stability of the output of the sensor is damaged, and the sensor cannot meet the practical engineering application requirement. Disclosure of Invention The embodiment of the invention provides a direct-current ultra-high voltage measurement sensor, which aims to solve the problem of poor use stability of an ultra-high voltage direct-current voltage transformer in the prior art. The embodiment of the invention discloses a direct-current ultra-high voltage measurement sensor which comprises a detection electrode, a shielding shell, an insulating layer, an ion flow guide electrode and a core sensitive element, wherein an installation space is arranged in the shielding shell, the core sensitive element is arranged in the installation space, an induction space is arranged outside the shielding shell, the detection electrode, the insulating layer and the ion flow guide electrode are arranged in the induction space, a pair of detection electrodes are correspondingly arranged on two sides of the induction space, one end of each detection electrode is connected with the shielding shell through the insulating layer, the other end of each detection electrode is connected with the ion flow guide electrode through the insulating layer, the ion flow guide electrode and the pair of detection electrodes are in semi-encircling connection to form an induction space, the ion flow guide electrode is in opposite direction with the ion flow and receives ion flow, and the core sensitive element is connected with the detection electrodes through a wire. Further, the insulating layer comprises a voltage-resistant insulating layer and a common insulating layer, one end of the detection electrode is connected with the shielding shell through the voltage-resistant insulating layer, and the other end of the detection electrode is connected with the ion current diversion electrode through the common insulating layer. Further, the voltage measurement sensor further comprises a high-voltage wire, and the high-voltage wire is arranged on the outer side of the shielding shell and is connected with the shielding shell in a potential mode. Further, the ion current diversion electrode is in potential connection with the shielding shell through a lead. Further, the shielding shell is provided with a shell opening, and the shell opening is provided with a movable opening and closing through hole. Further, the core sensing element comprises a sensing probe and a receiving port, the sensing probe is connected with the detection electrode through a wire, and the core sensing element is in remote communication connection with a ground control power supply through the receiving port. Further, the core sensing element comprises a plurality of shielding electrodes and a plurality of sensing electrodes, and the sensing electrodes and the shielding electrodes are arranged in pairs. Further, the core sensitive element comprises a metal packaging shell, and the metal packaging shell is connected with the sensitive probe through an insulating material layer. Further, the shielding electrode is provided as a movable electrode. Further, the sensing electrode outputs a sensor signal through an operational amplifier. According to the sensor, the ion flow guide electrode which is equipotential with the high-voltage end is arranged, and the ion flow is physically captured and guided to the high-voltage end before reaching the core sensing electrode, so that continuous accumulation of ion charges on the key sensing surface of the sensor is avoided, main factors causing output drift and precision reduction of the sensor are eliminated, and the stability and reliability of long-term operation of the sensor under an ultrahigh voltage/extra-high voltage direct current e