CN108344935A - A kind of UHF local discharge detection devices and its detection method - Google Patents
A kind of UHF local discharge detection devices and its detection method Download PDFInfo
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- CN108344935A CN108344935A CN201810494295.0A CN201810494295A CN108344935A CN 108344935 A CN108344935 A CN 108344935A CN 201810494295 A CN201810494295 A CN 201810494295A CN 108344935 A CN108344935 A CN 108344935A
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- local discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing 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
- G01R31/1227—Testing 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
- G01R31/1254—Testing 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 of gas-insulated power appliances or vacuum gaps
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- Testing Relating To Insulation (AREA)
Abstract
A kind of UHF local discharge detection devices of present invention proposition and detection method, have high sensitivity, high environmental suitability.Preferably, UHF local discharge detection devices of the invention include metallic shield ring, detection window, metal shell.Metal shell is the open-ended cavity of cup-shaped, and the surface of the periphery and metallic shield ring of open end is conformal.The detection method implemented according to UHF local discharge detection devices of the present invention realizes Partial Discharge Detection including the use of the UHF signals that the detection of external type UHF sensor is radiated from disc insulator, signal is detected by the way that dual-port is upper from different directions, there is higher sensitivity.
Description
Technical field
The present invention relates to a kind of detection devices and detection method applied to GIS device, and in particular to a kind of UHF is locally put
Electric detection means and detection method.
Background technology
Gas insulated combined electrical equipment（Gas Insulated Switchgear, abbreviation GIS）It is middle 1960s
A kind of novel power transmission and transforming equipment occurred, it completely or partially combines the various electrical equipments in substation in addition to transformer
In a closed metal shell, and it is filled with SF6 gases of the 0.4 ~ 0.5MPa with superior isolation performance, to realize conductor pair
Insulation between fracture, alternate and fracture.Few with floor space, small by external environmental interference, the time between overhauls(TBO) is long, in-site installation work
The advantages that work amount is small and the engineering construction period is short.
Although GIS device reliability of operation is very high, because its internal inevitably defect can still cause failure and by
Step expands, and frequently results in the generation of major accident, it has also become the problem of power department is extremely paid close attention to and the research of this ambit
Hot spot.According to the statistical data of 23.10 working groups of CIGRE international survey report, the GIS that Japan puts into operation before 1985 occurs
562 failures are crossed, wherein insulation fault accounts for 60% or so, and insulation fault accounts in 247 failures of the GIS put into 1985 later
50% or so, and insulation fault more is happened in the equipment of high voltage grade.GIS voltage class is higher, and power failure is made
At loss it is bigger, maintenance cost is also higher.The electric faults of GIS most commonly are characterized in sending out before insulation completely breakdown or flashover
Raw shelf depreciation.By being monitored on-line to GIS partial discharge, the insulation status of GIS can be monitored, finds exist in GIS in advance
Insulation defect, avoid the generation of insulation fault.
The sensor for being used to receive UHF in the prior art is installed on inside GIS device or is installed on disc insulator appearance
Face（Referring to Fig. 1）.Type UHF sensor is inside GIS device or when disc insulator outer surface, received electromagnetic wave signal frequency
Rate is very wide.From signal spectrum, there is Energy distribution in 300MHz~1.5GHz frequency ranges.External antenna UHF
Its basic occupation mode of Partial Discharge Detection method is that antenna is placed on GIS disc insulator rings, and part is put inside detection GIS
UHF signals that are that electricity is sent out and being leaked to the outside through disc insulator gap by internal conduction, pass through the signal frequency of its leakage
Spectrum signature judges the partial discharges fault being likely to occur inside GIS.A kind of use external as shown in Figure 1, which detects part, to be put
The detection method of electricity, external UHF local discharge detection devices are arranged at the signals leakiness mouth 4 of disc insulator 2, for examining
Survey the local discharge signal that the frequency range revealed from signals leakiness mouth 4 is 1GHz≤F≤1.5GHz.Go out inside GIS device
When current situation portion point of discharge 3, since the shell 1 of GIS device is generally metal, local discharge signal is difficult to be radiated outside shell 1,
Disc insulator 2 is insulator, and there is signals leakiness mouth 4, local discharge signal to be radiated from signals leakiness mouth 4 on shell 1
To outside, sensor is arranged here, the check device 20 of sensor internal can detect local discharge signal, metal screen
It covers cover 30 and effectively shields external signal, prevent from interfering.
It is had the following disadvantages in above-mentioned technology：Built-in sensor needs to reequip GIS device, after installing
Carrying out safeguarding each time is required for special messenger to dismantle GIS device, and the old equipment of not detection device is inconvenient to upgrade.It is external
Although formula detection device facilitates detection, since insulator is a kind of electromagnetic wave transparent material, shelf depreciation is generated inside GIS device
When signal, local discharge signal readily diffuses into the region of not detection sensor, or signal exists by force on some direction
Signal is weak on another direction, be likely to cause the weak output signal for being transmitted to external UHF local discharge detection devices in this way and
Detection is caused to fail.And GIS device, when applied to outdoor environment, insulator without any blockage, open is easy due to rain
Snow, reasons and the aging such as UV irradiations cause crack, generate security risk.
Invention content
A kind of UHF local discharge detection devices of present invention proposition and detection method, it is of the existing technology to solve the problems, such as.
In order to solve the above technical problem, the present invention provides a kind of UHF local discharge detection devices, including：Metal screen
Cover ring, detection window and metal shell；The wherein described metal shell is the open-ended cavity of cup-shaped, and open at one end has and metal
The conformal periphery in the surface of shading ring.
Further, include a circular metal plate in the inside of the metal shell, circular metal plate passes through two probes
It is connected with the inner wire of the coaxial connector outside the metal shell.
Further, the detection window is orthogonal cross gap.
Further, the detection window is cross gap or rectangular aperture or square gap.
Further, when mounted, the metal shell is aligned with the geometric center of the detection window, local discharge signal
It is coupled to the circular metal plate by the detection window.
Further, the mode that the metal shell may be used welding or stickup or be mechanically fixed with the metallic shield ring
It links together.
Further, the medium of high-k is filled in the metal shell.
Another aspect, the present invention also provides a kind of detection method for local discharge of local discharge detection device, including with
Lower step：
S1：Timing acquiring local discharge signal：Then, computer is selected by bus marco SPDT switch acquisition time in turn first
Lead to two prevention at radio-frequency port, signal is handled by being transmitted to output circuit after amplifier, filter, while starting high-speed figure acquisition
One channel of device, is converted to digital signal, then be sent in computer by bus by the signal of each prevention at radio-frequency port successively
Carry out data processing；
S2：Shelf depreciation judges：According to the signal amplitude that filter exports, with the detection scene of measured in advance without shelf depreciation
Noise signal amplitude be basis for estimation, judge whether occur shelf depreciation, when there is shelf depreciation generation, carry out next step letter
Otherwise number amplitude com parison returns to step S1 and waits for timing acquiring local discharge signal next time；
S3：Signal amplitude compares：In the presence of having shelf depreciation, since UHF electromagnetic waves have decaying in communication process, in measurement
Compare the amplitude size for the discharge signal that different port detects, chooses the sensor of discharge signal amplitude maximum；
S4：Display：When a partial discharge occurs, it will determine that result is shown in computer screen；When there is no to occur shelf depreciation,
It returns to S1 and waits for timing acquiring local discharge signal next time.
The present invention detects the UHF signal realizations office radiated from disc insulator using UHF local discharge detection devices
Portion's discharge examination detects signal by the way that dual-port is upper from different directions, and has higher sensitivity.Detection window is much smaller than day
The bore face of line, thereby ensures that the mechanical strength of metallic shield ring.Metallic shield ring improves Earthing Reliability, prevents badly
Corrosion of the environment to insulator.Metallic shield ring wraps up entire insulator.Occurs shelf depreciation point inside GIS device
When, since the shell of GIS device is generally metal, local discharge signal is difficult to be radiated hull outside, and disc insulator is exhausted
Metallic shield ring is arranged in edge body outside disc insulator, and metallic shield ring is equipped with detection window, and local discharge signal is from inspection
It surveys window to be radiated outside, the circular metal plate of metal shell and its inside can detect that shelf depreciation is believed by coupling
Number.The UHF local discharge detection devices of the present invention are full-closed structure, can effectively shield external signal, prevent from interfering.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of external UHF local discharge detection devices in the prior art；
Fig. 2 is the structural schematic diagram of the metallic shield ring of the UHF local discharge detection devices of the present invention；
Fig. 3 is the side view of the metal shell of the UHF local discharge detection devices of the present invention；
Fig. 4 is the perspective view when metal shell of the UHF local discharge detection devices of the present invention is mounted on metallic shield ring；
Fig. 5 is the circuit block diagram of the output signal of the UHF local discharge detection devices of the present invention.
Wherein：
Shell 1, disc insulator 2, check device 20, shelf depreciation point 3, metallic shield 30, signals leakiness mouth 4；
Metallic shield ring 5, detection window 6, circular metal plate 7, metal shell 8, coaxial connector 9.
Specific implementation mode
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates the basic structure of the present invention, therefore it only shows the composition relevant to the invention.
Embodiment 1
Fig. 2 is the structural schematic diagram of the metallic shield ring of the UHF local discharge detection devices of the present invention.
As shown in Fig. 2, the present embodiment 1 provides a kind of UHF local discharge detection devices, including it is arranged in GIS insulators
Metallic shield ring 5 outside ring, metallic shield ring 5 are equipped with detection window 6.The detection window 6 can be cross gap, rectangular slits
Gap, square gap or polygon gap, the present embodiment is by taking orthogonal cross gap as an example.The quantity of the detection window 6
Can be with more than one, and multiple detection windows can form array.
Fig. 3 is the side view of the metal shell of the UHF local discharge detection devices of the present invention.
Fig. 4 is the perspective when metal shell of the UHF local discharge detection devices of the present invention is mounted on metallic shield ring
Figure.
As shown in Figure 3, Figure 4, the UHF local discharge detection devices of the present embodiment 1 further include that one end open one end is closed
The cross section of cup-shaped metal shell 8, metal shell 8 is circle, and the geometric dimension of 8 internal cavity of metal shell constitutes a cylinder
Shape waveguide resonator.One end that metal shell 8 is contacted with metallic shield ring 5 is open end, the periphery and metal screen of open end
The surface for covering ring 5 is conformal.There are two coaxial connectors 9 for blind end setting opposite to the open end.It is wrapped in the inside of metal shell 8
Include a circular metal plate 7, the inner wire that circular metal plate 7 passes through the coaxial connector 9 outside two probes and metal shell 8
It is connected.There are two the blind ends that aperture enables the probe to penetrate metal shell 8 for setting on metal shell 8.As shown in figure 4,
When mounted, metal shell 8 is aligned with the geometric center of detection window 6.Local discharge signal is coupled to circle by detection window 6
Shape sheet metal 7.
The inner wire of two coaxial connectors 9 connect with two probes and forms two distributing points on circular metal plate 7.
The port of two coaxial connectors 9 constitutes two radio frequency output ports.Two distributing points cross gap orthogonal to two respectively
Feed.Cross gap has wider frequency range, can cover the frequency range of local discharge signal.Specifically, the width of cross gap
Degree is 2 ~ 10mm, and the length in the orthogonal gap of cross gap every is the half of operation wavelength, can be specifically 10 ~
30mm, it is preferable that be 18mm.
Metal shell 8 modes such as may be used welding or stickup with metallic shield ring 5 or be mechanically fixed and links together.For
Reduction volume can fill the medium of high-k in metal shell 8.
Fig. 5 is the circuit block diagram of the output signal of the UHF local discharge detection devices of the present invention.
As shown in figure 5, the signal processing circuit in this UHF local discharge detection devices includes the time grate being sequentially connected
SPDT switch, amplifier, filter and output circuit.Two ports of time grate SPDT switch are for acquiring cross gap two
On a direction.Local discharge signal is transmitted to filter through amplifier amplification, is transferred to after filtered device filtering interference signals
Output circuit is handled, and output circuit reconnects computer, and by treated, data are shown.The output circuit can
To be high-speed machine tools.
Embodiment 2
On the basis of embodiment 1, the present embodiment 2 provides a kind of detection method for local discharge of local discharge detection device,
Include the following steps：
S1：Timing acquiring local discharge signal：Then, computer is selected by bus marco SPDT switch acquisition time in turn first
Lead to two prevention at radio-frequency port, while starting a channel of high-speed machine tools, successively converts the signal of each prevention at radio-frequency port
For digital signal, then it is sent in computer by bus and carries out data processing；
S2：Shelf depreciation judges：According to the signal amplitude that filter exports, with the detection scene of measured in advance without shelf depreciation
Noise signal amplitude be basis for estimation, judge whether occur shelf depreciation, when there is shelf depreciation generation, carry out next step letter
Otherwise number amplitude com parison returns to step S1 and waits for timing acquiring local discharge signal next time；
S3：Signal amplitude compares：In the presence of having shelf depreciation, since UHF electromagnetic waves have decaying in communication process, in measurement
Compare the amplitude size for the discharge signal that different port detects, chooses the sensor of discharge signal amplitude maximum；
S4：Display：When a partial discharge occurs, it will determine that result is shown in computer screen；When there is no to occur shelf depreciation,
It returns to S1 and waits for timing acquiring local discharge signal next time.
It can be seen from the above description that the present invention realizes following technique effect：
External according to the present invention and its detection method are detected exhausted from benzvalene form using external UHF local discharge detection devices
UHF signals that edge radiates realize Partial Discharge Detection, and signal is detected by the way that dual-port is upper from different directions, and with compared with
High sensitivity.Detection window is much smaller than the bore face of antenna, thereby ensures that the mechanical strength of metallic shield ring.Metallic shield
Ring protection disc insulator improves the adaptive capacity to environment for being exposed to outer disc insulator originally.
The present invention UHF local discharge detection devices are easy for installation, quick, stable and strong antijamming capability, can subtract significantly
The workload of few GIS device inspection, improves the reliability of detection working efficiency and testing result, can be that kiowatt reduction is big
Material resources, financial resources and the manpower of amount, increase economic efficiency, and ensure the operational safety of power equipment.Long-range angle sees, external UHF
Local discharge sensor can be used cooperatively with partial discharge detecting system, can widen the scope of application to GIS device, transformer,
The detection of the local discharge signal of high-tension cable etc..
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of UHF local discharge detection devices, which is characterized in that including：
Metallic shield ring, detection window and metal shell；Wherein
The metal shell is the open-ended cavity of cup-shaped, and open at one end has the circumference conformal with the surface of metallic shield ring
Face.
2. UHF local discharge detection devices according to claim 1, which is characterized in that
Include a circular metal plate in the inside of the metal shell, circular metal plate passes through two probes and the metal-back
The inner wire of coaxial connector outside body is connected.
3. UHF local discharge detection devices according to claim 1, which is characterized in that
The detection window is orthogonal cross gap.
4. UHF local discharge detection devices according to claim 1, which is characterized in that
The detection window is cross gap or rectangular aperture or square gap.
5. UHF local discharge detection devices according to claim 2, which is characterized in that
When mounted, the metal shell is aligned with the geometric center of the detection window, and local discharge signal passes through the inspection
It surveys window and is coupled to the circular metal plate.
6. UHF local discharge detection devices according to claim 1, which is characterized in that
The mode that the metal shell may be used welding or stickup or be mechanically fixed with the metallic shield ring links together.
7. UHF local discharge detection devices according to claim 1, which is characterized in that
The medium of filling high-k in the metal shell.
8. a kind of detection method for local discharge of local discharge detection device, includes the following steps：
S1：Timing acquiring local discharge signal：Then, computer is selected by bus marco SPDT switch acquisition time in turn first
Lead to two prevention at radio-frequency port, signal is handled by being transmitted to output circuit after amplifier, filter, while starting high-speed figure acquisition
One channel of device, is converted to digital signal, then be sent in computer by bus by the signal of each prevention at radio-frequency port successively
Carry out data processing；
S2：Shelf depreciation judges：According to the signal amplitude that filter exports, with the detection scene of measured in advance without shelf depreciation
Noise signal amplitude be basis for estimation, judge whether occur shelf depreciation, when there is shelf depreciation generation, carry out next step letter
Otherwise number amplitude com parison returns to step S1 and waits for timing acquiring local discharge signal next time；
S3：Signal amplitude compares：In the presence of having shelf depreciation, since UHF electromagnetic waves have decaying in communication process, in measurement
Compare the amplitude size for the discharge signal that different port detects, chooses the sensor of discharge signal amplitude maximum；
S4：Display：When a partial discharge occurs, it will determine that result is shown in computer screen；When there is no to occur shelf depreciation,
It returns to S1 and waits for timing acquiring local discharge signal next time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810494295.0A CN108344935A (en) | 2018-05-22 | 2018-05-22 | A kind of UHF local discharge detection devices and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810494295.0A CN108344935A (en) | 2018-05-22 | 2018-05-22 | A kind of UHF local discharge detection devices and its detection method |
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| Publication Number | Publication Date |
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| CN108344935A true CN108344935A (en) | 2018-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810494295.0A Withdrawn CN108344935A (en) | 2018-05-22 | 2018-05-22 | A kind of UHF local discharge detection devices and its detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557855A (en) * | 2020-12-23 | 2021-03-26 | 武汉华威众科电力有限公司 | On-line partial discharge shielding type sensor and implementation method thereof |
| CN112578233A (en) * | 2019-09-30 | 2021-03-30 | 中国石油化工股份有限公司 | Protection device of partial discharge detector |
-
2018
- 2018-05-22 CN CN201810494295.0A patent/CN108344935A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112578233A (en) * | 2019-09-30 | 2021-03-30 | 中国石油化工股份有限公司 | Protection device of partial discharge detector |
| CN112557855A (en) * | 2020-12-23 | 2021-03-26 | 武汉华威众科电力有限公司 | On-line partial discharge shielding type sensor and implementation method thereof |
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Application publication date: 20180731 |
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