CN103698674A - Flow cable partial discharge online monitoring system - Google Patents

Flow cable partial discharge online monitoring system Download PDF

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Publication number
CN103698674A
CN103698674A CN201410001172.0A CN201410001172A CN103698674A CN 103698674 A CN103698674 A CN 103698674A CN 201410001172 A CN201410001172 A CN 201410001172A CN 103698674 A CN103698674 A CN 103698674A
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China
Prior art keywords
preposition
conditioning unit
frequency
detection
module
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CN201410001172.0A
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Chinese (zh)
Inventor
王彦良
钱勇
徐斌
张峰
靳方元
郗骋
刘宗杰
李靖强
付珂
田崇峰
张一鸣
李嫣然
魏翀
盛戈皞
江秀臣
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国家电网公司
国网山东省电力公司济宁供电公司
上海交通大学
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Priority to CN201410001172.0A priority Critical patent/CN103698674A/en
Publication of CN103698674A publication Critical patent/CN103698674A/en

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Abstract

The invention discloses a flow cable partial discharge online monitoring system, comprising a high frequency sensor, an extra-high frequency sensor, a preposition conditioning unit, a detection front end and a portable detection terminal, wherein the preposition conditioning unit comprises a preposition high frequency conditioning unit and a preposition extra-high frequency conditioning unit; the preposition high frequency conditioning unit is correspondingly connected with the high frequency sensor; the preposition extra-high frequency conditioning unit is correspondingly connected with the extra-high frequency sensor; the detection front end is connected with the preposition conditioning unit, and is used for collecting a signal transmitted by the preposition conditioning unit and sending relevant data after characteristic parameters of the signal are extracted; the portable detection terminal is wirelessly connected with the detection front end, and is used for receiving data sent by the detection front end and performing analysis and diagnosis on the data. The flow cable partial discharge online monitoring system is flexible and convenient to use, large in the coverage area, and capable of continuously working for a long time, greatly improving the antijamming capability of the field, and improving the reliability of a field detection result.

Description

A kind of flow-type cable local discharge on-line monitoring system
Technical field
The present invention relates to a kind of testing device for insulation defect, relate in particular to a kind of pick-up unit of cable insulation defect.
Background technology
XLPE power cable, in During Process of Long-term Operation, is vulnerable to the impact of the factors such as electric field, thermal effect, mechanical stress, chemical corrosion and environmental baseline, and its quality of insulation will be deteriorated gradually, cause most probably the destruction of insulation system.And power cable is very important equipment in electric power power transmission and transformation, it has the restrictive function of bottleneck effect formula to electric load safety, stable transfer.Research is found, the partial discharge quantity of cable and its insulation status are closely related, the size of partial discharge quantity is characterizing the defect that whether has its safe operation of harm in cable insulation, therefore, Partial Discharge Detection is the consistent best approach evaluated for XLPE cable insulation status of recommending of the International Power authoritative institution tissues such as experts and scholars both domestic and external and IEEE, IEC, international conference on large HV electric systems (CIGRE).
At present, the conventional preventive trials that adopt are safeguarded in the maintenance repair of XLPE cable more, this test generally will regularly or aperiodically be carried out, the maintenance time cycle is long, and easily cause the waste of resource, in addition can not find in time the insulation fault in XLPE cable, therefore can not meet current electric power application needs.
In order to make up the deficiency of conventional test, can also adopt the repair based on condition of component of XLPE cable equipment.Conventionally, in order to ensure the safety and stability of the on-the-spot operation of cable, adopt installation partial discharge monitoring system to carry out long term monitoring and adopt portable detection equipment to carry out the method for shelf depreciation band electro-detection.But operating experience for many years and practical application effect show:
(1) failure rate of cable is lower, and the economy of on-line monitoring system is not good, and hard-wired on-line monitoring system is with high costs, and corresponding with it, the insulation defect of discovery seldom;
(2) portable checkout equipment number of channels very little, detects when being unsuitable for many cable lines or a plurality of cable intermediate joint, and in addition, for the close occasion of the personnel that are not suitable for (as On-Site Testing), portable checkout equipment can not be suitable for;
(3) prior art adopts single sensor technology, and interference free performance is poor, and False Rate is high.
Therefore, angle from economy and applicability, need to develop a kind of partial discharge detecting system that is applicable to the various running environment of cable, can carry out flow detection to each transformer station or each cable line, the Partial Discharge Detection level of General Promotion on-site cable.
Summary of the invention
The object of the present invention is to provide a kind of flow-type cable local discharge on-line monitoring system, it adopts high frequency and superfrequency detection technique, local discharge signal is gathered and feature extraction, through wireless network, the data transmission of extraction is carried out to analyzing and diagnosing to terminal again, its compact portable, be convenient to mobilely, be applicable to various cable running environment, Partial Discharge Detection level that can General Promotion on-site cable.
To achieve these goals, the present invention proposes a kind of flow-type cable local discharge on-line monitoring system, it comprises:
Sensor, it comprises high frequency sensors (for example working band is 1-20MHz) and superfrequency sensor (for example working band is 500MHz-1.5GHz), and described high frequency sensors is set to the high-frequency pulse current signal producing when detection streamer is inner, and shelf depreciation occurs; The ultrahigh frequency electromagnetic wave signal that described superfrequency sensor setting excites while being the inner generation of detection streamer shelf depreciation;
Preposition conditioning unit, it comprises preposition high frequency conditioning unit and preposition high frequency conditioning unit, the connection corresponding to described high frequency sensors of described preposition high frequency conditioning unit, described preposition high frequency conditioning unit is set to the signal of corresponding high frequency sensors transmission to amplify and filtering; Described preposition superfrequency conditioning unit and the corresponding connection of described superfrequency sensor, described preposition superfrequency conditioning unit be set to the signal of corresponding superfrequency sensor transmissions amplify, filtering and detection;
Detect front end, it is connected with described preposition conditioning unit, the signal of the preposition conditioning unit transmission of described detection front-end collection, and after extracting the characteristic parameter of signal, relevant data are sent;
Portable sense terminals, itself and the wireless connections of described detection front end, described portable sense terminals receives and detects the data that front end sends, so that it is carried out to analyzing and diagnosing.
Flow-type cable local discharge on-line monitoring system of the present invention, its high frequency sensors is connected with preposition high frequency conditioning unit with corresponding preposition high frequency conditioning unit with superfrequency sensor, preposition conditioning unit is connected with detection front end, sensors coupled to signal through sending to detection front end after the conditioning of preposition conditioning unit, by its image data and extract partial discharge pulse's signal characteristic parameter, then be wirelessly transmitted to portable sense terminals, portable sense terminals is carried out analyzing and diagnosing to data.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described high frequency sensors is pincerlike structure, to be clamped on tested cable.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described superfrequency sensor is microstrip antenna, and the aerial panel of microstrip antenna is triangle logarithm period formula.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described detection front end has two acquisition channels, respectively corresponding preposition high frequency conditioning unit and preposition superfrequency conditioning unit.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described detection front end comprises:
Signals collecting and feature extraction unit, it is connected with described preposition conditioning unit, described signals collecting and feature extraction unit gather the signal of preposition conditioning unit transmission, and extracting the characteristic parameter of signal, this characteristic parameter can be phase place, peak value, pulse width, rise time and the fall time of pulse;
Wireless sending module, it is connected with signals collecting and feature extraction unit, so that described relevant data are sent.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described detection front end also comprises supply module, and it is set to as described signals collecting and feature extraction unit, wireless sending module and the power supply of preposition conditioning unit.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described wireless sending module is Zigbee wireless module.
Further, in flow-type cable local discharge on-line monitoring system of the present invention, described portable sense terminals comprises:
Wireless receiving module, itself and the wireless connections of detection front end, detect to receive the data that front end sends;
Be equiped with the portable main frame of diagnostic expert system, it is connected with described wireless receiving module, receives the data of wireless receiving module transmission.
Further, above-mentioned wireless receiving module is Zigbee wireless module.
Further, above-mentioned diagnostic expert system comprises:
Signal pre-processing module, its data by reception are converted to the three-dimensional collection of illustrative plates (being PRPD collection of illustrative plates) of phase place-discharge capacity-discharge time, and obtain maximum pd quantity PHASE DISTRIBUTION two-dimensional map, mean discharge magnitude PHASE DISTRIBUTION two-dimensional map, discharge time PHASE DISTRIBUTION two-dimensional map, discharge time distribution two-dimensional map and discharge energy distribution two-dimensional map;
Characteristic fingerprint extraction module, it is connected with signal pre-processing module, so that described three-dimensional collection of illustrative plates and two-dimensional map are extracted to characteristic parameter, these characteristic parameters can comprise FRACTAL DIMENSION, vacancy rate, standout, measure of skewness, local peaking's number, electric discharge degree of asymmetry, phase place degree of asymmetry, the simple crosscorrelation factor and phase place intermediate value etc.;
Property data base, it stores the shelf depreciation PRPD collection of illustrative plates of the cable insulation defect of characterize representative, and typical shelf depreciation type mainly contains point discharge, creeping discharge and internal discharge;
Intelligence Classifier, it is connected respectively with property data base with characteristic fingerprint extraction module, described Intelligence Classifier is according to the characteristic parameter classification local discharge signal of input, and the shelf depreciation PRPD collection of illustrative plates of itself and characteristic library storage is compared, to export shelf depreciation type;
Assessment diagnostic module, it is connected with characteristic fingerprint extraction module, to judge the order of severity of shelf depreciation according to the data of characteristic fingerprint extraction module transmission.
Flow-type cable local discharge on-line monitoring system of the present invention has the following advantages: it is installed, disassembles conveniently, uses flexibly, and on-line monitoring system coverage is large, can long time continuous working; This flow-type cable local discharge on-line monitoring system, by adopting two kinds of sensors (high frequency sensors and superfrequency sensor) detection technique, significantly promotes on-the-spot antijamming capability simultaneously, has improved the reliability of Site Detection result.
Accompanying drawing explanation
Fig. 1 is a kind of use view of flow-type cable local discharge on-line monitoring system of the present invention under a kind of embodiment.
Fig. 2 is that the another kind of flow-type cable local discharge on-line monitoring system of the present invention under a kind of embodiment used view.
Fig. 3 is the structural representation block diagram of the expert diagnostic system of flow-type cable local discharge on-line monitoring system of the present invention under a kind of embodiment.
Embodiment
Below in conjunction with Figure of description and specific embodiment, flow-type cable local discharge on-line monitoring system of the present invention is made to further explanation and explanation.
Fig. 1 has illustrated a kind of use view of flow-type cable local discharge on-line monitoring system of the present invention under a kind of embodiment.
Fig. 2 is that the another kind of flow-type cable local discharge on-line monitoring system of the present invention under a kind of embodiment used view.
As depicted in figs. 1 and 2, in the present embodiment, flow-type cable local discharge on-line monitoring system comprises: organize sensor more, this many group sensors corresponding XLPE cable setting respectively, wherein each group sensor includes high frequency sensors 2 and superfrequency sensor 3, the High Frequency Current Sensor that wherein high frequency sensors 2 is pincerlike structure, its corresponding clip is held in the use state shown in ground wire 1(Fig. 1 of XLPE cable) or transposition line 1(Fig. 2 shown in use state) on, the high-frequency pulse current signal producing during the inner generation of detection streamer shelf depreciation, the internal diameter of this high frequency sensors 2 is 80mm, working band is 1-20MHz, the ultrahigh frequency electromagnetic wave signal exciting during the inner generation of superfrequency sensor 3 detection streamers shelf depreciation, this superfrequency sensor 3 is microstrip antenna, and the aerial panel of microstrip antenna is triangle logarithm period formula, and working band is 500MHz-1.5GHz, the preposition conditioning unit of many groups, wherein each is organized preposition conditioning unit and includes preposition high frequency conditioning unit 4 and preposition high frequency conditioning unit 5, the connection corresponding to high frequency sensors 2 of preposition high frequency conditioning unit 4, the connection corresponding to superfrequency sensor 3 of preposition superfrequency conditioning unit 5, the signal of 4 pairs of corresponding high frequency sensors of preposition high frequency conditioning unit, 2 transmission amplifies and filtering, enlargement factor is 100, filtered band is 1-20MHz, the signal of 5 pairs of corresponding superfrequency sensors of preposition superfrequency conditioning unit, 3 transmission amplifies, filtering and detection, enlargement factor is 100, filtered band is 500MHz-1.5GHz, pulse width after detection is less than 10 μ s, a plurality of detection front ends, its respectively with the corresponding connection of each preposition conditioning unit, each detects front end and all has two acquisition channels, the signal that corresponding preposition high frequency conditioning unit 4 and preposition superfrequency conditioning unit 5 transmit respectively, detection front end comprises: signals collecting and feature extraction unit, wireless sending module and supply module, wherein signals collecting and feature extraction unit are connected with preposition conditioning unit, thereby adopt triggering mode to gather partial discharge pulse's signal of preposition conditioning unit transmission, sampling rate is 100MS/s, and the phase place to the partial discharge pulse's signal extraction pulse gathering, peak value, pulse width, rise time and fall time 5 pulse waveform characteristic parameters, wireless sending module is Zigbee wireless module, it is connected with signals collecting and feature extraction unit, so that pulse waveform characteristic parameter is sent, supply module is alternating current 220V input, direct current 12V output, it is signals collecting and feature extraction unit, wireless sending module and the power supply of preposition conditioning unit, portable sense terminals, it passes through wireless network wireless connections with detection front end, portable sense terminals comprises in the present embodiment: wireless receiving module and the portable main frame that is equiped with diagnostic expert system, wherein wireless receiving module is Zigbee wireless module, it passes through wireless network wireless connections with detection front end, and be connected by serial ports with portable main frame, wireless receiving module is transferred to diagnostic expert system by the pulse waveform characteristic parameter that detects front end transmission, diagnostic expert system carries out analyzing and diagnosing according to the pulse waveform characteristic parameter receiving to local discharge condition, portable main frame can be Portable industrial computer.
Fig. 3 has shown the structural representation block diagram of the expert diagnostic system of flow-type cable local discharge on-line monitoring system of the present invention under a kind of embodiment.
As shown in Figure 3, this diagnostic expert system comprises: signal pre-processing module, characteristic fingerprint extraction module, property data base, Intelligence Classifier and assessment diagnostic module, wherein signal pre-processing module is converted to the three-dimensional collection of illustrative plates of phase place-discharge capacity-discharge time by the Partial Discharge Data of reception, and obtains maximum pd quantity PHASE DISTRIBUTION two-dimensional map, mean discharge magnitude PHASE DISTRIBUTION two-dimensional map, discharge time PHASE DISTRIBUTION two-dimensional map, discharge time distribution two-dimensional map and discharge energy distribution two-dimensional map; Characteristic fingerprint extraction module is connected with signal pre-processing module, so that three-dimensional collection of illustrative plates and two-dimensional map are extracted to characteristic parameter, these characteristic parameters can comprise FRACTAL DIMENSION, vacancy rate, standout, measure of skewness, local peaking's number, electric discharge degree of asymmetry, phase place degree of asymmetry, the simple crosscorrelation factor and phase place intermediate value etc.; Property data base stores the shelf depreciation PRPD collection of illustrative plates of the cable insulation defect of characterize representative; Intelligence Classifier is trained neural network classifier, it is connected respectively with property data base with characteristic fingerprint extraction module, Intelligence Classifier be input as the aforementioned characteristic parameter extracting from three-dimensional collection of illustrative plates and two-dimensional map, be output as shelf depreciation type and degree of confidence thereof in cable, the shelf depreciation type of output may be point discharge, creeping discharge and insulation internal discharge; Assessment diagnostic module is connected with characteristic fingerprint extraction module, it is according to the data of characteristic fingerprint extraction module transmission, adopt trend analysis and fuzzy evaluation theory to carry out analysis and evaluation to the intensity history development procedure of local discharge signal, judge the order of severity of current shelf depreciation, judged result can be divided into normal, slight and serious three kinds.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, have many similar variations thereupon.If all distortion that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.

Claims (10)

1. a flow-type cable local discharge on-line monitoring system, is characterized in that, comprising:
Sensor, it comprises high frequency sensors and superfrequency sensor, described high frequency sensors is set to the high-frequency pulse current signal producing when detection streamer is inner, and shelf depreciation occurs; The ultrahigh frequency electromagnetic wave signal that described superfrequency sensor setting excites while being the inner generation of detection streamer shelf depreciation;
Preposition conditioning unit, it comprises preposition high frequency conditioning unit and preposition high frequency conditioning unit, the connection corresponding to described high frequency sensors of described preposition high frequency conditioning unit, described preposition high frequency conditioning unit is set to the signal of corresponding high frequency sensors transmission to amplify and filtering; Described preposition superfrequency conditioning unit and the corresponding connection of described superfrequency sensor, described preposition superfrequency conditioning unit be set to the signal of corresponding superfrequency sensor transmissions amplify, filtering and detection;
Detect front end, it is connected with described preposition conditioning unit, the signal of the preposition conditioning unit transmission of described detection front-end collection, and after extracting the characteristic parameter of signal, relevant data are sent;
Portable sense terminals, itself and the wireless connections of described detection front end, described portable sense terminals receives and detects the data that front end sends, so that it is carried out to analyzing and diagnosing.
2. flow-type cable local discharge on-line monitoring system as claimed in claim 1, is characterized in that, described high frequency sensors is pincerlike structure, to be clamped on tested cable.
3. flow-type cable local discharge on-line monitoring system as claimed in claim 1, is characterized in that, described superfrequency sensor is microstrip antenna, and the aerial panel of microstrip antenna is triangle logarithm period formula.
4. flow-type cable local discharge on-line monitoring system as claimed in claim 1, is characterized in that, described detection front end has two acquisition channels, respectively corresponding preposition high frequency conditioning unit and preposition superfrequency conditioning unit.
5. flow-type cable local discharge on-line monitoring system as claimed in claim 1, is characterized in that, described detection front end comprises:
Signals collecting and feature extraction unit, it is connected with described preposition conditioning unit, and described signals collecting and feature extraction unit gather the signal of preposition conditioning unit transmission, and extract the characteristic parameter of signal;
Wireless sending module, it is connected with signals collecting and feature extraction unit, so that described relevant data are sent.
6. flow-type cable local discharge on-line monitoring system as claimed in claim 5, is characterized in that, described detection front end also comprises supply module, and it is set to as described signals collecting and feature extraction unit, wireless sending module and the power supply of preposition conditioning unit.
7. flow-type cable local discharge on-line monitoring system as claimed in claim 5, is characterized in that, described wireless sending module is Zigbee wireless module.
8. flow-type cable local discharge on-line monitoring system as claimed in claim 1, is characterized in that, described portable sense terminals comprises:
Wireless receiving module, itself and the wireless connections of detection front end, detect to receive the data that front end sends;
Be equiped with the portable main frame of diagnostic expert system, it is connected with described wireless receiving module, receives the data of wireless receiving module transmission.
9. flow-type cable local discharge on-line monitoring system as claimed in claim 8, is characterized in that, described wireless receiving module is Zigbee wireless module.
10. flow-type cable local discharge on-line monitoring system as claimed in claim 1, is characterized in that, described diagnostic expert system comprises:
Signal pre-processing module, its data by reception are converted to the three-dimensional collection of illustrative plates of phase place-discharge capacity-discharge time, and obtain maximum pd quantity PHASE DISTRIBUTION two-dimensional map, mean discharge magnitude PHASE DISTRIBUTION two-dimensional map, discharge time PHASE DISTRIBUTION two-dimensional map, discharge time distribution two-dimensional map and discharge energy distribution two-dimensional map;
Characteristic fingerprint extraction module, it is connected with signal pre-processing module, so that described three-dimensional collection of illustrative plates and two-dimensional map are extracted to characteristic parameter;
Property data base, it stores the shelf depreciation PRPD collection of illustrative plates of the cable insulation defect of characterize representative;
Intelligence Classifier, it is connected respectively with property data base with characteristic fingerprint extraction module, described Intelligence Classifier is according to the characteristic parameter classification local discharge signal of input, and the shelf depreciation PRPD collection of illustrative plates of itself and characteristic library storage is compared, to export shelf depreciation type;
Assessment diagnostic module, it is connected with characteristic fingerprint extraction module, to judge the order of severity of shelf depreciation according to the data of characteristic fingerprint extraction module transmission.
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CN104375064A (en) * 2014-11-07 2015-02-25 深圳供电局有限公司 Partial discharge on-line monitoring alarm confidence coefficient analysis method and device
CN104573335A (en) * 2014-12-25 2015-04-29 武汉大学苏州研究院 Extraction method for feature information of partial-discharge mass and real-time electric physical quantity
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