CN110161383A - A kind of detection device for partial discharge of switch cabinet - Google Patents

A kind of detection device for partial discharge of switch cabinet Download PDF

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Publication number
CN110161383A
CN110161383A CN201910363724.5A CN201910363724A CN110161383A CN 110161383 A CN110161383 A CN 110161383A CN 201910363724 A CN201910363724 A CN 201910363724A CN 110161383 A CN110161383 A CN 110161383A
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China
Prior art keywords
partial discharge
discharge signal
ceramic condenser
detection
resistance
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CN201910363724.5A
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Chinese (zh)
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CN110161383B (en
Inventor
唐伟超
刘红文
王科
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials

Abstract

The application discloses a kind of detection device for partial discharge of switch cabinet, including the first ceramic condenser, Partial discharge signal extraction element, charge indicating device and Partial discharge signal detection device;Partial discharge signal extraction element includes the second ceramic condenser and Partial discharge signal extracts resistance, and the first ceramic condenser, the second ceramic condenser and Partial discharge signal extract resistance and be sequentially connected in series, and partial discharge signal detection device is in parallel with the second ceramic condenser;Charge indicating device is in parallel with Partial discharge signal extraction element, and charge indicating device includes the inductance being sequentially connected in series, divider resistance and electrification indicator light;Frequency Response detection is carried out to ceramic condenser element in advance, determines that the band of operation of ceramic condenser element is f1‑f2, and according to the band of operation, the first ceramic condenser, the second ceramic condenser and Partial discharge signal needed for determining detection high frequency partial discharge signal extract the value of resistance.The application can prevent shunting of the electrification indicator light to Partial discharge signal when charging indicator light normal work, and partial discharge detection precision is high.

Description

A kind of detection device for partial discharge of switch cabinet
Technical field
This application involves switchgear technical field more particularly to a kind of detection device for partial discharge of switch cabinet.
Background technique
Insulating capacity is an important performance indexes of switchgear, and Partial Discharge Detection is reactive switches state of insulation Effective means.Currently, common switch cabinet partial discharge detecting instrument has High Frequency Current Sensor and ultrasonic sensor etc..Wherein, The wide then sensitivity of the signal bandwidth of High Frequency Current Sensor is small, and then high sensitivity, detection accuracy are unable to get guarantee to narrow bandwidth;It is super Sonic sensor is influenced greatly by ambient enviroment, plant machinery vibration, and when ultrasonic signal is propagated in insulating materials decaying compared with Greatly, it is also difficult to guarantee the accuracy and reliability of local discharge signal detection.
Summary of the invention
The application provides a kind of detection device for partial discharge of switch cabinet, to solve partial discharge of switchgear signal detection precision Low problem.
The application provides a kind of detection device for partial discharge of switch cabinet, including the first ceramic condenser, Partial discharge signal extract dress It sets, charge indicating device and Partial discharge signal detection device;Partial discharge signal extraction element includes the second ceramic condenser and Partial discharge signal Resistance is extracted, the first ceramic condenser, the second ceramic condenser and Partial discharge signal extract resistance and be sequentially connected in series, partial discharge signal detection device Resistor coupled in parallel is extracted with Partial discharge signal;Charge indicating device is in parallel with Partial discharge signal extraction element, charge indicating device include according to Secondary concatenated inductance, divider resistance and electrification indicator light;Frequency Response detection is carried out to ceramic condenser element in advance, determines ceramics The band of operation of capacity cell is f1-f2, and according to the band of operation, determine detection high frequency partial electric discharge letter The first ceramic condenser, the second ceramic condenser and Partial discharge signal needed for number extract the value of resistance.
Optionally, the impedance of charge indicating device is ZLR, the impedance of Partial discharge signal extraction element is ZCR, then ZLR﹥ 100ZCR, Wherein,
ZLR=2 π f1L+R2+RL
In formula, f1For the minimum value of ceramic condenser element manipulation bandwidth;L is the inductance value of inductance;R2For the electricity of divider resistance Resistance value;RLFor the resistance value for charging indicator light;C2For the capacitance of the second ceramic condenser;R1The electricity of resistance is extracted for Partial discharge signal Resistance value.
Optionally, the input terminal of the first ceramic condenser is connect with switchgear single phase poaer supply line, the output of the first ceramic condenser It is provided with first between end and the input terminal of the second ceramic condenser to be electrically connected contact, the contact that is electrically connected of the input terminal of inductance and first connects It connects, charges the output end ground connection of indicator light.
Optionally, the output end of the second ceramic condenser and Partial discharge signal are extracted and are electrically connected between the input terminal of resistance equipped with second Contact, Partial discharge signal extract the output end ground connection of resistance;The input terminal of partial discharge signal detection device is connect with second contact that is electrically connected, The output end of partial discharge signal detection device is grounded.
Optionally, the capacitor value range of the first ceramic condenser is 1nf-10nf;The capacitor value model of second ceramic condenser It encloses for 10pf-100pf;The resistance value value range that Partial discharge signal extracts resistance is 0.16 Ω -32 Ω;
Optionally, the value range of inductance is 2mH-100mH, is 1MHz-10MHz shelf depreciation letter for Measurement bandwidth Number.
Optionally, to be detachably connected between partial discharge signal detection device and Partial discharge signal extraction element, Partial discharge signal inspection It surveys device to connect with electrical energy supply device, electrical energy supply device includes 220V power supply line or battery.
In technical solution described herein, in use, whether the electrification indicator light in observation charge indicating device shines, If it is luminance, illustrate the switchgear power supply electrification that detection device for partial discharge of switch cabinet is connected, this is could to start The detection of local discharge signal.When detecting high frequency partial discharge signal, in order to avoid charge indicating device shunts, while not shadow The work for ringing electrification indicator light, first passes through the Frequency Response for measuring different size of ceramic condenser element in advance, determines different size Ceramic condenser element bandwidth, using ceramic condenser element in a certain high frequency bandwidth have good Frequency Response and signal High frequency partial discharge signal is coupled in partial discharge signal detection device by coupling function, and is carried out by partial discharge signal detection device It detects and judges whether that partial discharges fault occurs.That is, Partial discharge signal extraction element is to be based on ceramic condenser element certainly Body Frequency Response selects the bandwidth with good Frequency Response to pass through reasonable selection as the range of detection local discharge signal Inductance, the first ceramic condenser, the second ceramic condenser and Partial discharge signal extract the elements such as resistance, realize and extract to local discharge signal Purpose, under high frequency Partial discharge signal, guarantee electrification indicator light can work normally, moreover it is possible to effectively prevent electrification indicator light reflux pair The shunting of Partial discharge signal, to improve the accuracy of local discharge signal detection.The detection device for partial discharge of switch cabinet tool Have the advantages that practical, high sensitivity, strong antijamming capability and detection accuracy are high.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of detection device for partial discharge of switch cabinet shown in the embodiment of the present application;
Fig. 2 is the Frequency Response curve graph of the ceramic condenser element shown in the embodiment of the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the application provides a kind of detection device for partial discharge of switch cabinet, including the first ceramic condenser 1, partial discharge Signal extracting device 2, charge indicating device 3 and Partial discharge signal detection device 4;Partial discharge signal extraction element 2 includes the second ceramics Capacitor 21 and Partial discharge signal extract resistance 22, the first ceramic condenser 1, the second ceramic condenser 21 and Partial discharge signal extract resistance 22 according to Secondary series connection, partial discharge signal detection device 4 are in parallel with Partial discharge signal extraction resistance 22;Charge indicating device 3 and Partial discharge signal extract Device 2 is in parallel, and charge indicating device 3 includes the inductance 31 being sequentially connected in series, divider resistance 32 and electrification indicator light 33;In advance to pottery Porcelain capacity cell carries out Frequency Response detection, determines that the band of operation of ceramic condenser element is f1-f2, and according to the work Make bandwidth range, the first ceramic condenser 1, the second ceramic condenser 21 and partial discharge needed for determining detection high frequency partial discharge signal The value of signal extraction resistance 22.
In the concrete realization, optionally, the input terminal of the first ceramic condenser 1 is connect with switchgear single phase poaer supply line 5, and first It is provided with first between the output end of ceramic condenser 1 and the input terminal of the second ceramic condenser 21 to be electrically connected contact 6, the input of inductance 31 End connect with first contact 6 that is electrically connected, and the output end for charging indicator light 33 is grounded.The output end and partial discharge of second ceramic condenser 21 are believed It number extracts and to be equipped with second between the input terminal of resistance 22 and be electrically connected contact 7, Partial discharge signal extracts the output end ground connection of resistance 22;Partial discharge The input terminal of signal supervisory instrument 4 is connect with second contact 7 that is electrically connected, the output end ground connection of partial discharge signal detection device 4.
In the present embodiment, the circulation path of power frequency component is 5 → the first 1 → inductance of ceramic condenser of switchgear single phase poaer supply line Whether 31 → divider resistance 32 → electrification indicator light 33, the electrification indicator light 33 in charge indicating device 3 are used to indicate switchgear Electrification, if electrification indicator light 33 is in luminance, the circulation path of power frequency component is conducting, illustrates switchgear office The switchgear power supply electrification that portion's discharging detection device is connected, this is the detection process that could start local discharge signal.Partial pressure Resistance 32 is used to realize under power current and divide, and may be selected to be adjustable resistance.
Due to when carrying out local discharge signal detection, it is often necessary to disconnect electrification indicator light 33, can just prevent electrification from referring to The shunting of showing device 3, and after disconnecting electrification indicator light 33, then whether be electriferous state, general feelings if being unable to judge accurately switchgear The extinguishing of indicator light 33 is charged under condition and then thinks that switchgear powers off, then can not carry out local discharge signal detection.In this regard, in order to avoid It charges indicator light 33 to shunt, while not influencing to charge the normal work of indicator light 33, the partial discharge of switchgear inspection is being installed It surveys before device, first passes through the Frequency Response for measuring different size of ceramic condenser element in the present embodiment in advance, determine different big The bandwidth of small ceramic condenser element has good Frequency Response and letter in a certain high frequency bandwidth using ceramic condenser element Number coupling function reasonably selects the property parameters of each element in device, so that high frequency partial discharge signal is coupled to partial discharge In signal supervisory instrument 4, is then detected by partial discharge signal detection device 4 and judge whether that partial discharges fault occurs.Than Such as, as shown in Fig. 2, being a kind of frequency impedance characteristic (Frequency Response) curve of ceramic condenser element, as shown in Figure 2, to 100nf Ceramic condenser element for, in the bandwidth of 1MHz-10MHz, Frequency Response stablize;10nf ceramic condenser element is come It says, in the bandwidth of 5MHz-30MHz, Frequency Response is stablized;For 1nf ceramic condenser element, in 10MHz-100MHz Bandwidth in, Frequency Response stablize.
Specifically, in selection element, following steps can be executed:
First, the Frequency Response of ceramic condenser element is detected, according to Frequency Response testing result, determines ceramic electrical Hold the frequency band of element.
Second, select ceramic condenser element corresponding bandwidth f1-f2 in steady operation.Wherein, f1For ceramic condenser member The minimum value of part bandwidth of operation, f2 are the maximum value of ceramic condenser element manipulation bandwidth.
Third, the first ceramic condenser 1,21 drawn game of the second ceramic condenser needed for determining detection high frequency partial discharge signal The value of discharge signal extraction resistance 22.
4th, it selects and checks the inductance 31 in charge indicating device 3.
5th, it calculates separately at frequency f1, the impedance Z of charge indicating device 3LR, and, Partial discharge signal extraction element 2 Impedance be ZCR, calculation as shown by the following formula:
ZLR=2 π f1L+R2+RL
In formula, L is the inductance value of inductance 31;R2For the resistance value of divider resistance 32;RLFor the resistance for charging indicator light 33 Value;C2For the capacitance of the second ceramic condenser 21;R1The resistance value of resistance 22 is extracted for Partial discharge signal.
6th, judge whether to meet ZLR>100ZCR.If meeting ZLR>100ZCR, then element selects to terminate;If be unsatisfactory for ZLR>100ZCR, then select the inductance value L of inductance 31 again, and repeat four steps to the 6th step check process, until full Sufficient ZLR>100ZCR
First ceramic condenser 1 and the second ceramic condenser 21, in frequency band f1-f2In range, which is commonly reached megahertz, Even white megahertz, belong to high frequency band, there is good Frequency Response, it being capable of steady operation;Second ceramic condenser 21 is used for Partial pressure, couples the high frequency partial discharge signal in switchgear single phase poaer supply line 5 in partial discharge signal detection device 4, partial discharge letter Number extracting resistance 22 is used to local discharge signal being converted to pulse voltage signal, in order to the reception of partial discharge signal detection device 4 And pulse voltage signal is analyzed, to realize the detection of local discharge signal.Partial discharge signal detection device 4 and electrical energy supply device 8 connections, electrical energy supply device 8 includes 220V power supply line or battery, for providing electricity for the work of partial discharge signal detection device 4 It can support, i.e. power supply.By selected above and setting, so that the circulation path of high frequency partial discharge signal is to open in the application It closes 5 → the first ceramic condenser of cabinet single phase poaer supply line, 1 → the second 21 → Partial discharge signal of ceramic condenser and extracts 22 → Partial discharge signal of resistance Detection device 4, that is, avoid the shunting of charge indicating device 3, to eliminate charge indicating device 3 and partial discharge signal detection process Between interference and influence.
That is, Partial discharge signal extraction element 2 is based on itself Frequency Response of ceramic condenser element, selection has good Range of the bandwidth of Frequency Response as detection local discharge signal, by reasonably selecting inductance 31, the first ceramic condenser 1, the Two ceramic condensers 21 and Partial discharge signal extract the equal elements of resistance 22, achieve the purpose that extract local discharge signal, then to mentioning The local discharge signal of taking-up is detected.Specifically, on every phase power supply line of switchgear, it is fitted with the first ceramic electrical Hold 1, Partial discharge signal extraction element 2 and charge indicating device 3, between partial discharge signal detection device 4 and Partial discharge signal extraction element 2 It can be to be detachably connected, then detection device for partial discharge of switch cabinet provided by the present application, application method are: be indicated in electrification Lamp 33 is under lightened state, starts the extraction and detection that carry out local discharge signal, by the input of partial discharge signal detection device 4 End is connected to second and is electrically connected contact 7, then other end ground connection starts electrical energy supply device 8, mentions for partial discharge signal detection device 4 Power supply source, then partial discharge signal detection device 4 is detected, and judges whether switchgear occurs shelf depreciation according to testing result Failure disconnects the connection of partial discharge signal detection device 4 after the completion of detection.The application can protect under high frequency Partial discharge signal Card electrification indicator light 33 can work normally, while also can effectively prevent the electrification reflux of indicator light 33 and dividing local discharge signal Stream, to improve the accuracy of local discharge signal detection.The application has practical, high sensitivity, strong antijamming capability The advantages that high with detection accuracy.
In the optional scheme of the present embodiment, the capacitor value range of the first ceramic condenser 1 is 1nf-10nf;Second ceramics The capacitor value range of capacitor 21 is 10pf-100pf;The resistance value value range that Partial discharge signal extracts resistance 22 is 0.16 Ω- 32Ω;The value range of inductance 31 is 2mH-100mH, is 1MHz-10MHz high frequency partial discharge signal for Measurement bandwidth.Tool The component parameters of body can be selected according to practical situations adaptability.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by appended Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.

Claims (7)

1. a kind of detection device for partial discharge of switch cabinet, which is characterized in that extracted including the first ceramic condenser (1), Partial discharge signal Device (2), charge indicating device (3) and Partial discharge signal detection device (4);Partial discharge signal extraction element (2) includes the second ceramics Capacitor (21) and Partial discharge signal extract resistance (22), and the first ceramic condenser (1), the second ceramic condenser (21) and Partial discharge signal extract Resistance (22) is sequentially connected in series, and partial discharge signal detection device (4) is in parallel with Partial discharge signal extraction resistance (22);Charge indicating device (3) in parallel with Partial discharge signal extraction element (2), charge indicating device (3) includes inductance (31), the divider resistance being sequentially connected in series (32) and indicator light (33) are charged;Frequency Response detection is carried out to ceramic condenser element in advance, determines the work of ceramic condenser element Making bandwidth range is f1-f2, and according to the band of operation, it determines first needed for detection high frequency partial discharge signal Ceramic condenser (1), the second ceramic condenser (21) and Partial discharge signal extract the value of resistance (22).
2. detection device for partial discharge of switch cabinet according to claim 1, which is characterized in that charge indicating device (3) Impedance is ZLR, the impedance of Partial discharge signal extraction element (2) is ZCR, then ZLR﹥ 100ZCR, wherein
ZLR=2 π f1L+R2+RL
In formula, f1For the minimum value of ceramic condenser element manipulation bandwidth;L is the inductance value of inductance (31);R2For divider resistance (32) Resistance value;RLFor the resistance value for charging indicator light (33);C2For the capacitance of the second ceramic condenser (21);R1For Partial discharge signal Extract the resistance value of resistance (22).
3. detection device for partial discharge of switch cabinet according to claim 1, which is characterized in that the first ceramic condenser (1) Input terminal is connect with switchgear single phase poaer supply line (5), and the output end of the first ceramic condenser (1) is defeated with the second ceramic condenser (21) Enter and be provided with first between end and be electrically connected contact (6), the input terminal of inductance (31) connect with first contact (6) that is electrically connected, and is charged and is indicated The output end of lamp (33) is grounded.
4. detection device for partial discharge of switch cabinet according to claim 1, which is characterized in that the second ceramic condenser (21) Output end and Partial discharge signal are extracted and are electrically connected contact (7) between the input terminal of resistance (22) equipped with second, and Partial discharge signal extracts resistance (22) output end ground connection;The input terminal of partial discharge signal detection device (4) is connect with second contact (7) that is electrically connected, Partial discharge signal inspection Survey the output end ground connection of device (4).
5. detection device for partial discharge of switch cabinet according to claim 2, which is characterized in that the first ceramic condenser (1) Capacitor value range is 1nf-10nf;The capacitor value range of second ceramic condenser (21) is 10pf-100pf;Partial discharge signal mentions The resistance value value range for taking resistance (22) is 0.16 Ω -32 Ω.
6. detection device for partial discharge of switch cabinet according to claim 5, which is characterized in that the value range of inductance (31) It is 1MHz-10MHz local discharge signal for Measurement bandwidth for 2mH-100mH.
7. detection device for partial discharge of switch cabinet according to claim 1 or 4, which is characterized in that partial discharge signal detection dress It sets to be detachably connected between (4) and Partial discharge signal extraction element (2), partial discharge signal detection device (4) and electrical energy supply device (8) it connects, electrical energy supply device (8) includes 220V power supply line or battery.
CN201910363724.5A 2019-04-30 2019-04-30 Switch cabinet partial discharge detection device Active CN110161383B (en)

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