CN115718239A - GIS field electric pulse partial discharge live detection device and detection method - Google Patents
GIS field electric pulse partial discharge live detection device and detection method Download PDFInfo
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- CN115718239A CN115718239A CN202211465182.0A CN202211465182A CN115718239A CN 115718239 A CN115718239 A CN 115718239A CN 202211465182 A CN202211465182 A CN 202211465182A CN 115718239 A CN115718239 A CN 115718239A
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Abstract
The invention discloses a GIS field electric pulse partial discharge live detection device and a detection method, which relate to the field of live detection of electric power equipment.A primary winding and an equivalent capacitor between secondary windings of a current transformer coil are both used as electric pulse signal coupling channels, two groups of pulse current signals in a GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels, partial discharge voltage signals with specified frequency are extracted through an electric pulse partial discharge detection loop respectively, the two groups of extracted electric pulse signals are output to a signal differential mode comparison and acquisition module, the electric pulse signals input by the two input channels are compared through the signal differential mode comparison and acquisition module, and interference signals are effectively eliminated; the invention simultaneously solves two problems of electric pulse coupling and high-voltage side partial discharge interference in electrified operation in GIS electrified partial discharge pulse detection, and realizes accurate detection of partial discharge in the GIS operation period so as to ensure safe and stable operation of GIS electrical equipment.
Description
Technical Field
The invention relates to the technical field of application of electrified detection of power equipment, in particular to a GIS (gas insulated switchgear) field electric pulse partial discharge electrified detection device and a detection method.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
GIS gas insulated metal enclosed switchgear (hereinafter referred to as GIS) is a necessary device in the power grid, the reliability of the GIS gas insulated metal enclosed switchgear is related to whether the power grid can safely and stably operate, and the GIS internal insulation failure can have a great influence on the stable operation of the GIS; when the GIS is put into a power grid for use, partial Discharge (PD) phenomenon occurs to the GIS internal insulation defect under the action of an electric field, and the Partial Discharge accelerates the GIS internal insulation degradation, and even GIS insulation breakdown occurs in severe cases; the reason for the partial discharge phenomenon of the GIS internal insulation is mainly two-sided: on one hand, in the process of manufacturing, transporting and installing the GIS, the GIS is inevitably subjected to the defects of bubbles, cracks, burrs, impurities and the like; on the other hand, under the action of overvoltage of the power system, partial discharge occurs in insulation defects of the running GIS, insulation aging is accelerated, and GIS insulation breakdown is finally caused, so that the whole power system cannot run normally or even breaks down, and huge loss is caused.
It can thus be seen that partial discharges are not only phenomena and indications of internal defects and degradation of insulation, but also important factors contributing to the aging of insulation, and therefore it is necessary to carry out partial discharge detection during GIS operation; at present, partial discharge detection during GIS operation is carried out in real time by using ultrahigh frequency, ultrasonic wave and ground electric wave method devices, and the online monitoring device has poor long-term working stability, cannot carry out quantitative judgment on partial discharge amount and cannot make accurate evaluation on insulation performance.
Disclosure of Invention
The invention aims to: aiming at the problem that no effective means exists in defect development and detection before GIS insulation fault operation at present, a GIS field electric pulse partial discharge live detection device and a detection method are provided, and the problems of GIS operation power supply side and environment interference are solved; the problem of GIS electrified partial discharge quantitative detection is solved, the accurate detection of partial discharge during GIS operation is realized, the internal defect of insulation and hidden danger caused by the long-term partial discharge phenomenon are found in time, and the safe and stable operation of GIS electrical equipment is guaranteed.
The technical scheme of the invention is as follows:
a GIS field electric pulse partial discharge live detection device comprises:
the current transformer is used for acquiring a pulse current signal in the GIS high-voltage conductor;
the input end of the electric pulse partial discharge detection circuit is connected with the grounding end of a current measurement module in the current transformer, and the output end of the electric pulse partial discharge detection circuit is connected with the signal acquisition module;
the pulse current signal enters an electric pulse partial discharge detection loop through a grounding end of the current measurement module; the electric pulse partial discharge detection circuit extracts partial discharge voltage signals with specified frequency and outputs the extracted electric pulse signals to the signal acquisition module for acquisition and detection.
Furthermore, equivalent capacitors among windings of the current transformer coil are used as electric pulse signal coupling channels, and pulse current signals in the GIS high-voltage conductor are obtained through the electric pulse signal coupling channels.
Furthermore, equivalent capacitors between a primary winding and a secondary winding of the current transformer coil are used as electric pulse signal coupling channels, and two groups of pulse current signals in the GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels;
the electric pulse partial discharge detection circuits are divided into two groups, and the signal acquisition module is a signal differential mode comparison acquisition module; the signal differential mode comparison and acquisition module compares the electric pulse signals input by the two input channels and effectively eliminates interference signals;
the input ends of the two groups of electric pulse partial discharge detection loops are respectively connected with the grounding ends of the current measurement modules corresponding to the primary winding and the secondary winding, and the output ends of the two groups of electric pulse partial discharge detection loops are respectively connected with two input channels of the signal differential mode comparison and acquisition module.
Furthermore, the signal differential mode comparison and acquisition module does not record the electric pulse signals with the voltage difference of the two input channels below 10%, and records the electric pulse signals with the voltage difference of the two input channels above 10%.
Further, the electric pulse partial discharge detection circuit includes:
and the frequency selection loop extracts the partial discharge voltage signal with the frequency of 200 k-1M Hz of the electric pulse.
Further, the electric pulse partial discharge detection circuit further includes:
and the signal amplification circuit amplifies the extracted electric pulse signal by adopting an adjustable amplification coefficient of 20-500 times and outputs the amplified electric pulse signal to the signal acquisition module for acquisition and detection.
Further, the electric pulse partial discharge detection circuit further includes:
and the voltage at two ends of the frequency selection loop is controlled to be more than 1V by the clamp voltage loop, so that the grounding end of the current measurement module is reliably grounded, and pulse current signals can enter the frequency selection loop.
Further, the electric pulse partial discharge detection circuit further includes:
and a protective ball gap, the voltage of which is set at 100V, for preventing the electric pulse partial discharge detection loop from being out of order.
A GIS field electric pulse partial discharge live detection method is based on the GIS field electric pulse partial discharge live detection device, and comprises:
step S1: acquiring a pulse current signal in a GIS high-voltage conductor through a current transformer;
step S2: enabling the pulse current signal to enter an electric pulse partial discharge detection loop through a grounding end of a current measurement module;
and step S3: the partial discharge voltage signal with the designated frequency is extracted through the electric pulse partial discharge detection loop, and the extracted electric pulse signal is output to the signal acquisition module for acquisition and detection.
Further, the step S1 includes:
equivalent capacitors between a primary winding and a secondary winding of a current transformer coil are used as electric pulse signal coupling channels, and two groups of pulse current signals in the GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels;
the step S2 includes:
two groups of pulse current signals respectively enter a group of electric pulse partial discharge detection loops through the grounding end of the current measurement module;
the step S3 includes:
based on the two groups of pulse current signals, partial discharge voltage signals with the frequency of 200 k-1M Hz of the electric pulse are extracted through corresponding electric pulse partial discharge detection loops respectively, and the two groups of extracted electric pulse signals are output to two input channels of a signal differential mode comparison and acquisition module; comparing the electric pulse signals input by the two input channels through a signal differential mode comparison and acquisition module, and effectively eliminating interference signals;
the signal difference mode comparison and acquisition module does not record the electric pulse signals with the voltage difference of the two input channels below 10%, and records the electric pulse signals with the voltage difference of the two input channels above 10%.
Compared with the prior art, the invention has the beneficial effects that:
1. a GIS field electric pulse partial discharge live detection device and a detection method comprise the following steps: the current transformer is used for acquiring a pulse current signal in the GIS high-voltage conductor; the input end of the electric pulse partial discharge detection circuit is connected with the grounding end of a current measurement module in the current transformer, and the output end of the electric pulse partial discharge detection circuit is connected with the signal acquisition module; the pulse current signal enters an electric pulse partial discharge detection loop through a grounding end of the current measurement module; the electric pulse partial discharge detection circuit extracts partial discharge voltage signals with specified frequency and outputs the extracted electric pulse signals to the signal acquisition module for acquisition and detection; the equivalent capacitance between windings of the current transformer coil is used as an electric pulse signal coupling channel, and a pulse current signal in a GIS high-voltage conductor is acquired through the electric pulse signal coupling channel, so that the problem of electric pulse coupling in GIS charged partial discharge pulse detection is solved.
2. Equivalent capacitors between a primary winding and a secondary winding of a current transformer coil are used as electric pulse signal coupling channels, two groups of pulse current signals in a GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels, partial discharge voltage signals with specified frequency are extracted through an independent electric pulse partial discharge detection loop respectively, the two groups of extracted electric pulse signals are output to a signal differential mode comparison and acquisition module, electric pulse signals input by the two input channels are compared through the signal differential mode comparison and acquisition module, interference signals are effectively eliminated, and therefore high-voltage side partial discharge interference is eliminated.
Drawings
Fig. 1 is a schematic diagram of a GIS field electrical pulse partial discharge live detection device.
Detailed Description
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example one
The partial discharge of the GIS is not only a phenomenon and a representation of internal defects and deterioration of insulation, but also an important factor for promoting insulation aging, and therefore, it is necessary to perform partial discharge detection during operation of the GIS; at present, the partial discharge detection during GIS operation is carried out by using ultrahigh frequency, ultrasonic wave and ground electric wave method devices for real-time monitoring, and the on-line monitoring device has poor long-term working stability, cannot carry out quantitative judgment on the partial discharge amount and cannot make accurate evaluation on the insulation performance.
Therefore, the present embodiment provides a device and a method for detecting GIS field electrical pulse partial discharge electrification based on the above problems, so as to solve the problem of interference between the GIS operation power supply side and the environment; the problem of GIS electrified partial discharge quantitative determination is solved, the partial discharge accurate detection during GIS operation is realized, insulating internal defect and the hidden danger that causes because of the partial discharge phenomenon takes place for a long time are in time discovered to the safe and stable operation of guarantee GIS electrical equipment.
Referring to fig. 1, a GIS field electrical pulse partial discharge live detection device specifically includes:
the current transformer (CT for short) is used for acquiring a pulse current signal in the GIS high-voltage conductor; it should be noted that, in this embodiment, only the current transformer is used to obtain the pulse current signal, and the structure of the current transformer itself is not improved, so that the current measurement module inside the current transformer measures the current amplitude and phase without being affected by the added electric pulse partial discharge detection loop; the effect of the current transformer in the embodiment is different from the effect of the current transformer (converting large current into small current for detection and the like);
preferably, an equivalent capacitor between windings of the current transformer coil is used as an electric pulse signal coupling channel, and a pulse current signal in the GIS high-voltage conductor is acquired through the electric pulse signal coupling channel;
the input end of the electric pulse partial discharge detection circuit is connected with the grounding end of a current measurement module in the current transformer, and the output end of the electric pulse partial discharge detection circuit is connected with the signal acquisition module;
the pulse current signal enters an electric pulse partial discharge detection loop through a grounding end of the current measurement module; the electric pulse partial discharge detection circuit extracts partial discharge voltage signals with specified frequency and outputs the extracted electric pulse signals to the signal acquisition module for acquisition and detection.
In this embodiment, in particular, GIS live partial discharge pulse detection mainly faces two problems of electric pulse coupling and high-voltage side partial discharge interference in live operation; the problem of electric pulse coupling is solved by taking equivalent capacitance between windings of a current transformer coil as an electric pulse signal coupling channel; the problem of interference caused by partial discharge at the high-voltage side in live-line operation is solved by the following structural design.
In this embodiment, specifically, equivalent capacitors between a primary winding and a secondary winding of the current transformer coil are both used as electric pulse signal coupling channels, and two groups of pulse current signals in the GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels; preferably, the current transformer generally has two or more secondary coils for measurement and protection, and in this embodiment, in order to ensure the validity of the output of the signal differential-mode comparison acquisition module, two protective coils are preferably used for the two coils of the current transformer;
the electric pulse partial discharge detection circuits are divided into two groups, and the signal acquisition module is a signal differential mode comparison acquisition module; the signal differential mode comparison and acquisition module compares the electric pulse signals input by the two input channels and effectively eliminates interference signals; preferably, the interference signal includes: corona discharge and the like during high-voltage side operation; the signal differential mode comparison acquisition module adopts the sampling rate of 5M S/s at most, and the sampling depth is 16MB at most;
the input ends of the two groups of electric pulse partial discharge detection loops are respectively connected with the grounding ends of the current measurement modules corresponding to the primary winding and the secondary winding, and the output ends of the two groups of electric pulse partial discharge detection loops are respectively connected with two input channels of the signal differential mode comparison and acquisition module.
In this embodiment, specifically, the signal difference mode comparing and collecting module does not record the electric pulse signal with the voltage difference of the two input channels being less than 10%, and records the electric pulse signal with the voltage difference of the two input channels being more than 10%; namely, the signal differential mode comparison and acquisition module takes 10% of the voltage amplitude of the single-channel sampling electric pulse as a threshold value, and the electric pulse signal with the voltage difference of the two input channels below 10% is not recorded.
In this embodiment, specifically, the electric pulse partial discharge detection circuit includes:
and the frequency selection loop extracts the partial discharge voltage signal with the frequency of 200 k-1M Hz of the electric pulse.
In this embodiment, specifically, the electric pulse partial discharge detection circuit further includes:
and the signal amplification loop amplifies the extracted electric pulse signal by adopting an adjustable amplification coefficient of 20-500 times, and outputs the amplified electric pulse signal to a signal acquisition module (namely a signal differential mode comparison acquisition module) for acquisition and detection.
In this embodiment, specifically, the electric pulse partial discharge detection circuit further includes:
and the voltage at two ends of the frequency selection loop is controlled to be more than 1V by the clamp voltage loop, so that the grounding end of the current measurement module is reliably grounded, and pulse current signals can enter the frequency selection loop.
In this embodiment, specifically, the electric pulse partial discharge detection circuit further includes:
and a protective ball gap, the voltage of which is set at 100V, for preventing the electric pulse partial discharge detection loop from being out of order.
Based on the above device for detecting the electrification of the GIS field electric pulse partial discharge, the embodiment provides a method for detecting the electrification of the GIS field electric pulse partial discharge, which specifically comprises the following steps:
step S1: acquiring a pulse current signal in a GIS high-voltage conductor through a current transformer;
step S2: enabling the pulse current signal to enter an electric pulse partial discharge detection loop through a grounding end of a current measurement module;
and step S3: the partial discharge voltage signal with the designated frequency is extracted through the electric pulse partial discharge detection loop, and the extracted electric pulse signal is output to the signal acquisition module for acquisition and detection.
In this embodiment, specifically, the step S1 includes:
equivalent capacitors between a primary winding and a secondary winding of a current transformer coil are used as electric pulse signal coupling channels, and two groups of pulse current signals in the GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels;
the step S2 includes:
two groups of pulse current signals respectively enter a group of electric pulse partial discharge detection loops through the grounding end of the current measurement module;
the step S3 includes:
based on the two groups of pulse current signals, partial discharge voltage signals with the frequency of 200 k-1M Hz of the electric pulses are extracted through corresponding electric pulse partial discharge detection loops respectively, and the two groups of extracted electric pulse signals are output to two input channels of a signal differential mode comparison and acquisition module; comparing the electric pulse signals input by the two input channels through a signal differential mode comparison and acquisition module, and effectively eliminating interference signals;
the signal difference mode comparison and acquisition module does not record the electric pulse signals with the voltage difference of the two input channels being less than 10%, and records the electric pulse signals with the voltage difference of the two input channels being more than 10%.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which all belong to the protection scope of the present application.
The background section is provided to present the context of the invention in general, and work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present invention.
Claims (10)
1. The utility model provides a GIS on-spot electric pulse office discharge live detection device which characterized in that includes:
the current transformer is used for acquiring a pulse current signal in the GIS high-voltage conductor;
the input end of the electric pulse partial discharge detection circuit is connected with the grounding end of a current measurement module in the current transformer, and the output end of the electric pulse partial discharge detection circuit is connected with the signal acquisition module;
the pulse current signal enters an electric pulse partial discharge detection loop through a grounding end of the current measurement module; the electric pulse partial discharge detection circuit extracts partial discharge voltage signals with specified frequency and outputs the extracted electric pulse signals to the signal acquisition module for acquisition and detection.
2. The GIS on-site electric pulse partial discharge live detection device according to claim 1, wherein an equivalent capacitor between windings of the current transformer coil is used as an electric pulse signal coupling channel, and a pulse current signal in a GIS high-voltage conductor is obtained through the electric pulse signal coupling channel.
3. The GIS on-site electric pulse partial discharge electrification detection device according to claim 2, wherein equivalent capacitors between a primary winding and a secondary winding of the current transformer coil are used as electric pulse signal coupling channels, and two groups of pulse current signals in the GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels;
the electric pulse partial discharge detection circuits are divided into two groups, and the signal acquisition module is a signal differential mode comparison acquisition module; the signal differential mode comparison and acquisition module compares the electric pulse signals input by the two input channels and effectively eliminates interference signals;
the input ends of the two groups of electric pulse partial discharge detection loops are respectively connected with the grounding ends of the current measurement modules corresponding to the primary winding and the secondary winding, and the output ends of the two groups of electric pulse partial discharge detection loops are respectively connected with two input channels of the signal differential mode comparison and acquisition module.
4. The GIS on-site electric pulse partial discharge electrification detection device according to claim 3, wherein the signal differential-mode comparison and acquisition module does not record the electric pulse signals with the voltage difference of the two input channels being below 10%, and records the electric pulse signals with the voltage difference of the two input channels being above 10%.
5. The GIS field electric pulse partial discharge live detection device according to claim 1, wherein the electric pulse partial discharge detection loop comprises:
and the frequency selection loop extracts the partial discharge voltage signal with the frequency of 200 k-1M Hz of the electric pulse.
6. The GIS field electric pulse partial discharge live detection device according to claim 5, wherein the electric pulse partial discharge detection loop further comprises:
and the signal amplification circuit amplifies the extracted electric pulse signal by adopting an adjustable amplification coefficient of 20-500 times and outputs the amplified electric pulse signal to the signal acquisition module for acquisition and detection.
7. The GIS field electric pulse partial discharge live detection device according to claim 5, wherein the electric pulse partial discharge detection loop further comprises:
and the voltage at two ends of the frequency selection loop is controlled to be more than 1V by the clamp voltage loop, so that the grounding end of the current measurement module is reliably grounded, and pulse current signals can enter the frequency selection loop.
8. The GIS field electric pulse partial discharge live detection device according to claim 5, wherein the electric pulse partial discharge detection loop further comprises:
and a protective ball gap, the voltage of which is set at 100V, for preventing the electric pulse partial discharge detection loop from being out of order.
9. A GIS field electric pulse partial discharge live detection method, based on any one of claims 1 to 8, comprising:
step S1: acquiring a pulse current signal in a GIS high-voltage conductor through a current transformer;
step S2: enabling the pulse current signal to enter an electric pulse partial discharge detection loop through a grounding end of a current measurement module;
and step S3: the partial discharge voltage signal with the designated frequency is extracted through the electric pulse partial discharge detection loop, and the extracted electric pulse signal is output to the signal acquisition module for acquisition and detection.
10. The GIS field electrical pulse partial discharge live line detection method according to claim 9, wherein the step S1 includes:
equivalent capacitors between a primary winding and a secondary winding of a current transformer coil are used as electric pulse signal coupling channels, and two groups of pulse current signals in the GIS high-voltage conductor are obtained through the two electric pulse signal coupling channels;
the step S2 includes:
two groups of pulse current signals respectively enter a group of electric pulse partial discharge detection loops through the grounding end of the current measurement module;
the step S3 includes:
based on the two groups of pulse current signals, partial discharge voltage signals with the frequency of 200 k-1M Hz of the electric pulse are extracted through corresponding electric pulse partial discharge detection loops respectively, and the two groups of extracted electric pulse signals are output to two input channels of a signal differential mode comparison and acquisition module; comparing the electric pulse signals input by the two input channels through a signal differential mode comparison and acquisition module, and effectively eliminating interference signals;
the signal difference mode comparison and acquisition module does not record the electric pulse signals with the voltage difference of the two input channels below 10%, and records the electric pulse signals with the voltage difference of the two input channels above 10%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117849556A (en) * | 2024-01-16 | 2024-04-09 | 艾菲汽车零部件(武汉)有限公司 | Intelligent early warning system is put in office of driving motor position sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117849556A (en) * | 2024-01-16 | 2024-04-09 | 艾菲汽车零部件(武汉)有限公司 | Intelligent early warning system is put in office of driving motor position sensor |
| CN117849556B (en) * | 2024-01-16 | 2024-06-18 | 艾菲汽车零部件(武汉)有限公司 | Intelligent early warning system is put in office of driving motor position sensor |
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