CN203414562U - Integrated ultrahigh frequency detection and determination apparatus for partial discharge of GIS - Google Patents
Integrated ultrahigh frequency detection and determination apparatus for partial discharge of GIS Download PDFInfo
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- CN203414562U CN203414562U CN201320242282.7U CN201320242282U CN203414562U CN 203414562 U CN203414562 U CN 203414562U CN 201320242282 U CN201320242282 U CN 201320242282U CN 203414562 U CN203414562 U CN 203414562U
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Abstract
An integrated ultrahigh frequency detection and determination apparatus for partial discharge of a GIS belongs to the field of electrical equipment insulation monitor technology. The apparatus comprises a sensor (1), a comparator (3), a counter (4), a single-chip microcomputer system (5) and a master control chamber computer (7). And the apparatus is characterized by also including a double-layer cavity casing (16) and a frequency demultiplier (2). Electromagnetic wave signals generated in partial discharge of the GIS are employed, through logarithmic detection, comparison and counting, whether partial discharge happens is determined. The apparatus is characterized by simple structure, convenient installation, easy wiring and high signal to noise ratio. The apparatus can be applied for insulation monitor on the GIS of a transformer station.
Description
Technical field
The invention belongs to insulation of electrical installation monitoring technical field, particularly gas-insulating and fully-enclosed combined electrical apparatus partial-discharge on-Line Monitor Device.
Background technology
Sulfur hexafluoride gas-insulating combined electric (GIS) is combined in the electrical equipment closed group such as isolating switch, disconnector, high speed grounding switch, voltage transformer (VT), current transformer, lightning arrester, part bus, sleeve pipe and cable termination in the metal shell of ground connection, take sulfur hexafluoride as insulation and arc-extinguishing medium, have that floor area is little, reliable, the time between overhauls(TBO) is long, maintenance workload is little, installation is rapid, operating cost is low, without features such as electromagnetic interference (EMI).In GIS accident, insulation fault has accounted for very large proportion, and therefore, the effective monitoring to GIS, must monitor in real time for insulation fault.The shelf depreciation omen of insulation fault often in GIS, so, significant to ensureing the safe operation of gas-insulating and fully-enclosed combined electric appliance equipment to the monitoring of GIS shelf depreciation.
During the inner generation of GIS shelf depreciation, rapid transfer due to point of discharge place electric charge, form very short current impulse of duration, and produce the electromagnetic wave that frequency component is extremely abundant, wherein transverse electric wave and transverse magnetic wave have lower-cut-off frequency separately, are generally 250MHz～350MHz, use ultrahigh frequency method shelf depreciation to be monitored to have antijamming capability strong, highly sensitive, feature that can long term monitoring.
In ultrahigh frequency detects, the acquisition and processing of ultra-high frequency signal is its key.Because on-the-spot electromagnetic environment is complicated, simulating signal is vulnerable to disturb, and as on-line monitoring equipment, requires it to have simplicity, ease for operation and on-the-spot feasibility.If China Patent No. is ZL200510057031.1 disclosed " gas insulation combined electric device local discharge superhigh frequency detection apparatus and method ", this device is mainly comprised of sensor, amplifilter, high-speed figure collector and computing machine etc., because computing machine and high-speed figure collector should be away from GIS, the frequency analog signal that sensor receives is high, transmitting range is far away, easily introduce and disturb, reduce signal to noise ratio (S/N ratio), and high-speed figure collector price is higher, be unfavorable for extensively promoting the use of of on-line monitoring equipment.And for example China Patent No. is ZL201210331526.9 disclosed " the intelligent switchboard partial discharge monitoring system and method detecting based on ultrahigh frequency " has reduced signal frequency by lower mixing, but frequency mixer makes its detection bandwidth little, it is less that its front end filtering and amplifying circuit makes to detect dynamic range, cannot monitor remote small-signal office simultaneously and put with in-plant large-signal office and put, and also easily introduce and disturb between sensor unit and monitoring means.
Summary of the invention
The object of the invention is to the weak point for existing GIS local discharge superhigh frequency monitoring device, improve GIS office and put the applicability of monitoring.Apparatus of the present invention, without GIS built-in aerial, do not change GIS body construction, and antenna and disposal system are placed in respectively each layer of double-layer cavity, and antenna chamber (10) is for antenna provides signal shielding, and circuit cavity shields for circuit board provides spatial accommodation and EMI.
The object of the present invention is achieved like this: a kind of integrated form GIS local discharge superhigh frequency detects decision maker, mainly comprise sensor (1), frequency demultiplier (2), comparer (3), counter (4), single-chip microcomputer (5), circuit board (6), master-control room computing machine (7), double-layer cavity shell (16).Sensor antenna is butterfly antenna (12), be arranged in sensor ground floor cavity (10), pass through epoxy encapsulation, in the middle of ground floor cavity and second layer cavity, have through hole (13), concentric cable (8) is connected teledish (12) by through hole with circuit board (6).Circuit board is arranged in sensor second layer cavity (11), by backboard (14), encapsulate, frequency demultiplier (2), comparer (3), counter (4), single-chip microcomputer (5) are on circuit board (6), circuit board (6) is processed Partial discharge signal, be output as RS485 bus (9), it is by being embedded in four pin Aviation Connector (15) outputs on backboard (14), circuit board (6) is connected by quad (9) with master-control room computing machine (7), and operations staff just can monitor office's condition to one's heart's content of GIS inside.Compare and adopt oscillograph or A/D capture card, this unit simulation signal line all concentrates in the metal shell being connected with GIS, effectively isolates external interference, has higher detection sensitivity and signal to noise ratio (S/N ratio).Frequency demultiplier of the present invention is by impedance matching circuit and logarithmic detector the electric circuit constitute, and it can convert the high-frequency signal lower than 10MHz to by putting ultra-high frequency signal higher than the office of 300MHz.
The course of work of apparatus of the present invention: when the inner generation of GIS shelf depreciation, the high frequency electromagnetic wave signal that butterfly antenna (12) in ground floor cavity (10) receives transfers on the circuit board (6) in circuit chamber by concentric cable (8), on circuit board (6), first by impedance matching circuit, carry out impedance matching, to reduce the reflection of high-frequency signal, then by frequency demultiplier (2), reduce signal frequency, frequency demultiplier (2) is comprised of logarithmic detector, antenna reception to ultra-high frequency signal through detection, obtain high-frequency signal, this high-frequency signal through comparer (3) relatively, obtain digital signal and offer counter (4), single-chip microcomputer (5) reads the value of counter (4) and is sent to the computing machine (7) in master-control room by 485 buses, single-chip microcomputer (5) also provides analog voltage to comparer (3) compare threshold of device as a comparison.
Contrive equipment measurement bandwidth is at hyper band, can effectively avoid low-frequency disturbance, and antenna circuit is all included in double-layer cavity, cavity also has shielding action to undesired signal, do not changing under the prerequisite of GIS structure, can clearly detect accurately the uhf electromagnetic wave information that the inner shelf depreciation of GIS produces, GIS is implemented to on-line monitoring.The sensor of integrated form is simplified the mode of connection, and cavity is outer is connected to master-control room by a quad, is convenient to multisensor in transformer station and installs and wiring.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and advantage are clearer, and below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is frame diagram of the present invention;
Fig. 2 is concrete structure figure of the present invention;
Embodiment
Below in conjunction with embodiment, further illustrate the present invention.
As depicted in figs. 1 and 2, a kind of integrated form GIS local discharge superhigh frequency detects decision maker, mainly comprise sensor antenna (1), frequency demultiplier (2), comparer (3), counter (4), Single Chip Microcomputer (SCM) system (5), master-control room computing machine (7).Frequency demultiplier (2), comparer (3), counter (4), single-chip microcomputer (5) are on circuit board (6), sensor (1) is connected by concentric cable (8) with circuit board (6), and circuit board (6) is connected by quad with master-control room computing machine (7).The local discharge superhigh frequency signal that sensor antenna (1) collects, by concentric cable (8), pass through hole (13), be connected to circuit board (6), on circuit board, by transducing signal detection, comparison, counting and single-chip microcomputer are identified, record exactly discharge information, the RS-485 signal of output is connected to 4 pin Aviation Connector (15) by quad, and 4 pin Aviation Connector (15) are connected by quad (9) with master-control room computing machine (7).
Contrive equipment measurement bandwidth is at hyper band, can effectively avoid 300MHz with the interference of lower frequency, and antenna circuit is all included in double-layer cavity, cavity also has shielding action to undesired signal, do not changing under the prerequisite of GIS structure, can clearly detect accurately the uhf electromagnetic wave information that the inner shelf depreciation of GIS produces, GIS is implemented to on-line monitoring.The sensor of integrated form is simplified the mode of connection, and cavity is outer is only connected to master-control room by a quad, is convenient to multisensor in transformer station and installs and wiring.
Claims (2)
1. an integrated form GIS local discharge superhigh frequency detects decision maker, mainly comprise sensor (1), comparer (3), counter (4), Single Chip Microcomputer (SCM) system (5), master-control room computing machine (7), it is characterized in that also having double-layer cavity shell (16) and frequency demultiplier (2), frequency demultiplier (2), comparer (3), counter (4), single-chip microcomputer (5) are on circuit board (6), sensor (1) is connected by concentric cable (8) with circuit board (6), and circuit board (6) is connected by quad (9) with master-control room computing machine (7).
2. according to integrated form GIS local discharge superhigh frequency claimed in claim 1, detect decision maker, it is characterized in that described sensor is by double-layer cavity shell (16), butterfly antenna (12), backboard (14), 4 pin Aviation Connector (15) form, butterfly antenna is arranged in sensor ground floor cavity (10), pass through epoxy encapsulation, circuit board is arranged in sensor second layer cavity (11), by backboard (14), encapsulate, in the middle of ground floor cavity and second layer cavity, there is through hole (13), concentric cable (8) is connected butterfly antenna (12) by through hole with circuit board (6), 4 pin Aviation Connector (15) are embedded on backboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320242282.7U CN203414562U (en) | 2013-05-07 | 2013-05-07 | Integrated ultrahigh frequency detection and determination apparatus for partial discharge of GIS |
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| CN201320242282.7U CN203414562U (en) | 2013-05-07 | 2013-05-07 | Integrated ultrahigh frequency detection and determination apparatus for partial discharge of GIS |
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| CN201320242282.7U Expired - Fee Related CN203414562U (en) | 2013-05-07 | 2013-05-07 | Integrated ultrahigh frequency detection and determination apparatus for partial discharge of GIS |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502759A (en) * | 2014-12-19 | 2015-04-08 | 国家电网公司 | Intelligent monitoring system of distribution network switch cabinet |
| CN104991176A (en) * | 2015-07-22 | 2015-10-21 | 广州供电局有限公司 | Signal conditioning circuit for ultrahigh frequency sensor |
| CN105676094A (en) * | 2016-04-22 | 2016-06-15 | 国网浙江省电力公司电力科学研究院 | External sensor for GIS partial discharge detection |
| CN113933663A (en) * | 2021-09-28 | 2022-01-14 | 广东电网有限责任公司广州供电局 | Active integrated built-in GIS partial discharge ultrahigh frequency detection device and GIS equipment |
-
2013
- 2013-05-07 CN CN201320242282.7U patent/CN203414562U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502759A (en) * | 2014-12-19 | 2015-04-08 | 国家电网公司 | Intelligent monitoring system of distribution network switch cabinet |
| CN104991176A (en) * | 2015-07-22 | 2015-10-21 | 广州供电局有限公司 | Signal conditioning circuit for ultrahigh frequency sensor |
| CN105676094A (en) * | 2016-04-22 | 2016-06-15 | 国网浙江省电力公司电力科学研究院 | External sensor for GIS partial discharge detection |
| CN113933663A (en) * | 2021-09-28 | 2022-01-14 | 广东电网有限责任公司广州供电局 | Active integrated built-in GIS partial discharge ultrahigh frequency detection device and GIS equipment |
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Granted publication date: 20140129 Termination date: 20150507 |
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