CN-122017673-A - Full-band sensor and full-band detection device

CN122017673ACN 122017673 ACN122017673 ACN 122017673ACN-122017673-A

Abstract

The invention discloses a full-band sensor and a full-band detection device, wherein the full-band sensor comprises an HFCT (high-frequency power computed tomography) layer group, an antenna layer group and a shielding layer group, the HFCT layer group comprises a sensing unit and a substrate, a plurality of grooves are formed in the substrate, the sensing unit is arranged in the corresponding grooves, the sensing units are sequentially connected in series to form a winding, the antenna layer group comprises a first insulating layer and a first conductor layer, the first insulating layer and the first conductor layer are stacked, a first conductive pattern is arranged on the first conductor layer, the shielding layer group comprises a second insulating layer, a third insulating layer and a second conductor layer, the substrate, the second insulating layer, the second conductor layer, the third insulating layer and the first conductor layer are sequentially stacked, the second conductor layer is provided with a copper layer, and a capacitive voltage divider is formed among the second conductor layer, the third insulating layer, the first conductor layer and a core. The invention realizes synchronous acquisition of high-frequency partial discharge, ultrahigh frequency, overvoltage, common frequency and harmonic signals thereof.

Inventors

MA ZHIQIN
CAI LINGLONG
WU ZHIYUN
LIAO ZIHAO
ZHOU DAN
SONG KUNYU
RAO ZHANGQUAN
LI ZHONGXIANG

Assignees

广东电网有限责任公司电力科学研究院

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (10)

1. A full-band sensor for detection of a transformer core ground signal, the full-band sensor comprising: The high-frequency partial discharge detector comprises an HFCT (high frequency Current Transformer) layer group, a first PCB (printed Circuit Board) layer group and a second PCB layer group, wherein the HFCT layer group is used for collecting high-frequency partial discharge signals in iron core grounding signals and comprises a plurality of sensing units and a matrix formed by sequentially stacking a plurality of first PCBs, a plurality of grooves which are arranged at intervals along the length direction of the matrix are formed in the matrix, the sensing units are arranged in the corresponding grooves, and the sensing units are sequentially connected in series to form a winding; An antenna layer group comprising a first insulating layer and a first conductor layer, wherein the first insulating layer and the first conductor layer are stacked, a first conductive pattern serving as an antenna is arranged on the first conductor layer and used for collecting ultrahigh frequency signals, and the first conductive pattern is connected with the winding in series, and The shielding layer group comprises a second insulating layer, a third insulating layer and a second conductor layer, wherein the substrate, the second insulating layer, the second conductor layer, the third insulating layer and the first conductor layer are sequentially stacked, and the second conductor layer is provided with a copper layer to form a shielding body; And a capacitive voltage divider is formed among the second conductor layer, the third insulating layer, the first conductor layer, the first insulating layer and the iron core so as to collect power frequency, harmonic signals and overvoltage signals in the iron core grounding signals.
2. The full-band sensor according to claim 1, wherein the sensing unit includes a magnetic core and a wire, the magnetic core is disposed in the corresponding groove, and the inner wall of the groove is provided with a second conductive pattern as a wire so as to be disposed around the outer peripheral side of the magnetic core, and a plurality of the second conductive patterns are sequentially connected in series.
3. The full-band sensor of claim 2, wherein the groove is rectangular, and the wire is formed by sequentially connecting a plurality of layers of second wire patterns in a zigzag shape.
4. The full-band sensor of claim 1, wherein both ends of the winding are connected to sampling resistors, respectively.
5. The full band sensor of claim 1, wherein the HFCT group of layers further comprises a fourth insulating layer stacked on a side of the substrate facing away from the second insulating layer.
6. The full band sensor of claim 1, further comprising a coaxial BNC connector, wherein the winding, the first conductive pattern, and the capacitive voltage divider are electrically connected to the BNC connector.
7. The full band sensor of claim 1, wherein the antenna group further comprises a fifth insulating layer stacked on a side of the first conductor layer facing away from the first insulating layer.
8. The full band sensor of claim 1, wherein the capacitive divider comprises a first capacitor and a second capacitor, wherein a first stage capacitor is formed between the first conductor layer, the first insulating layer, and the core, and a second stage capacitor is formed between the second conductor layer, the third insulating layer, and the first conductor layer.
9. The full band sensor of claim 1, further comprising an outer housing, wherein an inner sidewall surface of the outer housing is provided with a sixth insulating layer to form an insulating cavity, wherein the HFCT group, the antenna group, and the shielding group are disposed within the insulating cavity.
10. A full-band detection device, comprising a filter, a protection module, a collection device, and a full-band sensor as claimed in any one of claims 1-9, wherein the full-band sensor, the protection module, the filter, and the collection device are electrically connected in sequence.

Description

Full-band sensor and full-band detection device Technical Field The invention relates to the technical field of transformer core grounding signal detection, in particular to a full-band sensor and a full-band detection device. Background In the current power system, the detection of the grounding signal of the transformer core is mainly divided into two types, namely high-frequency partial discharge detection for identifying whether partial discharge faults exist in the transformer or not, and power frequency and harmonic signal detection for judging whether the core has multipoint grounding faults or not. The two detection methods are usually independent and run independently in practical application, and lack information fusion and association analysis mechanisms. Engineering practices and fault mechanism studies, however, have shown that there is a coupling relationship between partial discharge faults and core multipoint ground faults. On the one hand, severe partial discharge may cause arc or metal particle migration, thereby causing multipoint grounding of the core, and on the other hand, multipoint grounding of the core may cause increased circulation, local overheating, and accelerated aging of the insulating material, thereby inducing or aggravating partial discharge. In addition, in addition to the above two types of signals, the transformer core ground circuit may also contain transient overvoltage signals caused by lightning surge, switching operation, and the like. In the prior art, the isolated and single detection modes are generally adopted to process different types of signals respectively, so that unified collection of four key signals such as high-frequency partial discharge signals, power frequency and harmonic signals, overvoltage and the like cannot be realized, all effective information in the iron core grounding signals cannot be fully utilized during detection, and whether the four types of signals have association relation is difficult to judge. Disclosure of Invention The invention aims to solve the technical problems that in the prior art, the independent and single detection mode is generally adopted to process different types of signals respectively, unified collection of four key signals such as high-frequency partial discharge signals, power frequency and harmonic signals, overvoltage and the like cannot be realized, and therefore, all effective information in iron core grounding signals cannot be fully utilized during detection, and whether the four types of signals have association relation is difficult to judge. In order to solve the above technical problem, the present invention provides a full-band sensor for detecting a transformer core ground signal, the full-band sensor comprising: The high-frequency partial discharge detector comprises an HFCT (high frequency Current Transformer) layer group, a first PCB (printed Circuit Board) layer group and a second PCB layer group, wherein the HFCT layer group is used for collecting high-frequency partial discharge signals in iron core grounding signals and comprises a plurality of sensing units and a matrix formed by sequentially stacking a plurality of first PCBs, a plurality of grooves which are arranged at intervals along the length direction of the matrix are formed in the matrix, the sensing units are arranged in the corresponding grooves, and the sensing units are sequentially connected in series to form a winding; An antenna layer group comprising a first insulating layer and a first conductor layer, wherein the first insulating layer and the first conductor layer are stacked, a first conductive pattern serving as an antenna is arranged on the first conductor layer and used for collecting ultrahigh frequency signals, and the first conductive pattern is connected with the winding in series, and The shielding layer group comprises a second insulating layer, a third insulating layer and a second conductor layer, wherein the substrate, the second insulating layer, the second conductor layer, the third insulating layer and the first conductor layer are sequentially stacked, and the second conductor layer is provided with a copper layer to form a shielding body; And a capacitive voltage divider is formed among the second conductor layer, the third insulating layer, the first conductor layer, the first insulating layer and the iron core so as to collect power frequency, harmonic signals and overvoltage signals in the iron core grounding signals. Further, the sensing unit comprises a magnetic core and a wire, the magnetic core is arranged in the corresponding groove, the inner wall of the groove is provided with a second conductive pattern serving as the wire, the second conductive pattern is arranged on the outer peripheral side of the magnetic core in a surrounding mode, and the second conductive patterns are sequentially connected in series. Further, the groove is rectangular, and the wires are formed by sequentially connectin