CN104280637A - Lightning arrester online monitoring signal collection device with shielding function - Google Patents
Lightning arrester online monitoring signal collection device with shielding function Download PDFInfo
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- CN104280637A CN104280637A CN201410535556.0A CN201410535556A CN104280637A CN 104280637 A CN104280637 A CN 104280637A CN 201410535556 A CN201410535556 A CN 201410535556A CN 104280637 A CN104280637 A CN 104280637A
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Abstract
The invention discloses a lightening arrester online monitoring signal collection device with the shielding function. According to the signal collection device, a straight-through current transformer measures total-current signals flowing through a zinc oxide lightning arrester ground lead, and a voltage collection device obtains system running voltage of a secondary terminal of a voltage transformer connected with the zinc oxide lightning arrester in parallel. The lightening arrester online monitoring signal collection device is characterized in that a lightning arrester surface leakage current shielding coil is arranged, wound and fixed on the upper surface of the cluster parachute of the bottommost layer of the zinc oxide lightning arrester, and the lower end of the lightning arrester surface leakage current shielding coil and the zinc oxide lightning arrester ground lead located at the lower portion of the straight-through current transformer are grounded jointly. The leakage current and resistive current of the lightning arrester can be measured accurately under various weather conditions.
Description
Technical field
The present invention relates to a kind of line monitor signal harvester, is more particularly a kind of lightning arrester line monitor signal harvester.
Background technology
Zinc-Oxide Arrester is widespread use in electrical network, Zinc-Oxide Arrester has good nonlinear wind vibration, and under normal working voltage, the resistance value of Zinc-Oxide Arrester is very large, be equivalent to state of insulation, now flow through the electric current of Zinc-Oxide Arrester only in microampere uA or milliampere mA level; When superpotential effect, be such as struck by lightning, the resistance value of Zinc-Oxide Arrester sharply declines, and Zinc-Oxide Arrester is breakdown, is equivalent to short-circuit condition, thus superpotential energy of releasing, reach the effect of protection main equipment; After having served as loss of voltage, the high resistance state before Zinc-Oxide Arrester recovers.
The top-down structure distribution of the Zinc-Oxide Arrester run in transformer station is: lightning arrester upper end is system voltage downlead, and namely system voltage is applied on lightning arrester through this downlead; Center section is lightning arrester body, and the outer of lightning arrester body is umbrella; The bottom of lightning arrester body is the pillar as surge arrester support, play a supportive role and ensure lightning arrester to ground level; Being arranged on the copper bar of lightning arrester body lower end or aluminium row is ground wire as lightning arrester, and the lower end of lightning arrester body is through copper bar or aluminium row access earth mat.
Zinc-Oxide Arrester protects power equipment from the important electrical of overvoltage injury in electrical network, and its reliability of operation will directly affect the safety of electric system.The total current flowing through the normal Zinc-Oxide Arrester run is made up of capacity current and current in resistance property, and wherein capacity current accounts for principal ingredient.Zinc-Oxide Arrester make moist or aging after, mainly current in resistance property changes, if only detect total current, the subtle change of its current in resistance property by bury in oblivion by much bigger capacity current, detection sensitivity is very low.
To the monitoring of Zinc-Oxide Arrester, traditional method relies on artificial every day or make an inspection tour weekly reometer to carry out, and this mode cannot Timeliness coverage fault, is more difficult to the larger defect finding to produce fault; At present existing lightning arrester on-Line Monitor Device, its based on principle be: one is the electric current being flow through arrester ground line by straight-through current transformer measurement, obviously, the total current of what this mode detected is Zinc-Oxide Arrester; Two is that the secondary of the voltage transformer (VT) run from transformer station measures to obtain the working voltage of system; Three is that the working voltage total current of Zinc-Oxide Arrester being detected data and system detects data obtain lightning arrester current in resistance property by data processing, and its data processing adopts penalty method and fundamental current method.There are the following problems in actual motion for the Zinc-Oxide Arrester on-Line Monitor Device of this existing structure form:
Total current includes the volume Leakage Current of surperficial Leakage Current and the Zinc-Oxide Arrester flow through along cluster parachute in Zinc-Oxide Arrester.Lightning arrester surface resistance is larger by weather effect, rain or air humidity larger in all there will be lightning arrester surface Leakage Current obviously increase, because lightning arrester surface leakage current is resistive, lightning arrester on-Line Monitor Device must be caused to measure gained current in resistance property value inaccurate, easily cause erroneous judgement normal oxidation zinc lightning arrester to occur defect, affect the judgement to lightning arrester state.Summary of the invention
The present invention is the weak point for avoiding existing for above-mentioned prior art, provides a kind of lightning arrester line monitor signal harvester with function of shielding, so that ensure under various weather condition all can the leakage current of Measurement accuracy lightning arrester and current in resistance property.
The present invention is that technical solution problem adopts following technical scheme:
The lightning arrester line monitor signal harvester of band function of shielding of the present invention, described signal pickup assembly adopts straight-through current transformer measurement to flow through the full current signal of Zinc-Oxide Arrester ground wire, utilizes voltage acquisition module to obtain the system cloud gray model voltage at the voltage transformer secondary terminal place in parallel with Zinc-Oxide Arrester;
The design feature of the lightning arrester line monitor signal harvester of band function of shielding of the present invention is: arrange lightning arrester surface leakage current potted coil, described lightning arrester surface leakage current potted coil is wound around and is fixed on the upper surface of bottom a slice cluster parachute of Zinc-Oxide Arrester, lower end and the Zinc-Oxide Arrester ground wire common ground being positioned at described straight-through current transformer bottom of lightning arrester surface leakage current potted coil.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention installs potted coil additional at the upper surface of Zinc-Oxide Arrester bottom a slice cluster parachute, and the zinc paste ground wire through straight-through current transformer 7 bottom connects ground connection.Thus the leakage current on Zinc-Oxide Arrester surface is masked from the measurement of straight-through current transformer 7, straight-through current transformer 7 is measured for flowing through the intrinsic electric current of Zinc-Oxide Arrester, thus ensure that the total current that straight-through current transformer 7 measures is not subject to weather effect, also ensure that the accurate letter of final current in resistance property result of calculation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the action principle figure of potted coil in the present invention;
Fig. 3 is scheme of installation in the present invention;
Number in the figure: 1 voltage acquisition module, 2 wireless transport modules, 3 main control chips, 4 current acquisition modules, 5 Zinc-Oxide Arresters, 5a Zinc-Oxide Arrester ground wire, 6 lightning arrester surface leakage current potted coils, 6a potted coil ground wire, 7 straight-through current transformers, 8 host computers.
Embodiment
See Fig. 1 and Fig. 3, lightning arrester line monitor signal harvester with function of shielding in the present embodiment is identical with prior art: adopt straight-through current transformer 7 to measure the full current signal flowing through Zinc-Oxide Arrester ground wire, utilizes voltage acquisition module 1 to obtain the system cloud gray model voltage at the voltage transformer secondary terminal place in parallel with Zinc-Oxide Arrester 5; As shown in figures 1 and 3, what make improvements prior art in the present embodiment is arrange lightning arrester surface leakage current potted coil 6, lightning arrester surface leakage current potted coil 6 is wound around and is fixed on the upper surface of bottom a slice cluster parachute of Zinc-Oxide Arrester 5, and the lower end of lightning arrester surface leakage current potted coil 6 is by potted coil ground wire 6a and the Zinc-Oxide Arrester ground wire 5a common ground being positioned at straight-through current transformer 7 bottom.
See Fig. 1 and Fig. 3, lightning arrester on-Line Monitor Device with function of shielding in the present embodiment is identical with prior art: adopt straight-through current transformer 7 to measure the total current simulating signal flowing through Zinc-Oxide Arrester ground wire, current acquisition module 4 is set total current simulating signal is converted to total current digital signal, utilize voltage acquisition module 1 to gather and change the system cloud gray model voltage digital signal obtaining the voltage transformer secondary terminal place in parallel with Zinc-Oxide Arrester, wireless transport module 2 is set, main control chip 3 and host computer 8, the described full current signal digital signal that inspection current acquisition module 4 surveys acquisition is received by main control chip 3, and the digital signal of the system cloud gray model voltage from voltage acquisition module 1 is received through wireless transport module 2, main control chip 3 and host computer 8 is utilized to adopt penalty method to calculate the leakage current obtaining Zinc-Oxide Arrester 5, the effective value of current in resistance property and voltage, in the present embodiment, prior art is made improvements: lightning arrester surface leakage current potted coil 6 is set, lightning arrester surface leakage current potted coil 6 is wound around and is fixed on the upper surface of bottom a slice cluster parachute of Zinc-Oxide Arrester 5, and the lower end of lightning arrester surface leakage current potted coil 6 is by potted coil ground wire 6a and the Zinc-Oxide Arrester ground wire 5a common ground being positioned at described straight-through current transformer 7 bottom.
In the present embodiment, straight-through current transformer 7 is directly installed on the ground wire of Zinc-Oxide Arrester, ensure that Zinc-Oxide Arrester passes from straight-through current transformer, straight-through current transformer 7 measures the full current signal of Zinc-Oxide Arrester from Zinc-Oxide Arrester down conductor, lightning arrester surface leakage current potted coil 6 is tightly fastened at last a slice cluster parachute upper surface of Zinc-Oxide Arrester 5, and the lower end of lightning arrester surface leakage current potted coil 6 is connected ground connection with the zinc paste ground wire of straight-through current transformer 7 bottom.The leakage current of an arrester that main control chip 3 adopts RS485 bus to calculate, current in resistance property and voltage effective value are transferred to host computer 8, host computer 8 can accept the data that multiple main control chip 3 is uploaded simultaneously, thus carries out Real-Time Monitoring to the lightning arrester state at full station.
As shown in Figure 2, the lightning arrester on-Line Monitor Device circuit loop of function of shielding is with to comprise lightning arrester working voltage u, lightning arrester surface impedance R1, lightning arrester bulk resistivity R2, straight-through current transformer A, lightning arrester surface leakage current potted coil 6.Under the effect of lightning arrester working voltage u, electric current is mainly through lightning arrester surface impedance R1 and lightning arrester bulk resistivity R2 ground connection, and the current in resistance property calculating lightning arrester mainly uses the electric current flow through through lightning arrester bulk resistivity R2.Because the surface leakage current of lightning arrester affects comparatively large by weather condition, in air humidity, comparatively large or rainy day obviously to increase, if not in addition shielding result of calculation can be made to have comparatively big error.By circuit diagram shown in Fig. 2, due to lightning arrester surface leakage current potted coil 6 ground connection after straight-through current transformer 7, lightning arrester surface leakage current can be made not flow through from straight-through current transformer, thus avoid the impact of lightning arrester surface leakage current on result of calculation, make result of calculation more accurate.
Claims (1)
1. the lightning arrester line monitor signal harvester with function of shielding, described signal pickup assembly adopts straight-through current transformer (7) to measure the full current signal flowing through Zinc-Oxide Arrester ground wire, utilizes voltage acquisition module (1) to obtain the system cloud gray model voltage at the voltage transformer secondary terminal place in parallel with Zinc-Oxide Arrester (5); It is characterized in that: lightning arrester surface leakage current potted coil (6) is set, described lightning arrester surface leakage current potted coil (6) is wound around and is fixed on the upper surface of bottom a slice cluster parachute of Zinc-Oxide Arrester (5), lower end and the Zinc-Oxide Arrester ground wire common ground being positioned at described straight-through current transformer (7) bottom of lightning arrester surface leakage current potted coil (6).
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| CN201410535556.0A CN104280637A (en) | 2014-10-11 | 2014-10-11 | Lightning arrester online monitoring signal collection device with shielding function |
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| CN201410535556.0A CN104280637A (en) | 2014-10-11 | 2014-10-11 | Lightning arrester online monitoring signal collection device with shielding function |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849597A (en) * | 2015-05-20 | 2015-08-19 | 南京信息工程大学 | Metal oxide lightning arrester online monitoring method |
| CN106841711A (en) * | 2017-03-09 | 2017-06-13 | 国网福建省电力有限公司 | Lightning arrester live-line test shielding gripper structure and its method of work |
| CN106969798A (en) * | 2017-04-28 | 2017-07-21 | 国网河南省电力公司电力科学研究院 | Humiture monitoring device inside a kind of lightning arrester body |
| CN107394428A (en) * | 2017-07-31 | 2017-11-24 | 武汉大学 | A kind of shield type direct current grounding pole and the co-located earthed system of current conversion station grounded screen |
| CN107817398A (en) * | 2017-10-18 | 2018-03-20 | 国网黑龙江省电力有限公司检修公司 | Improved lightning arrester on-Line Monitor Device and monitoring method |
| CN112782458A (en) * | 2020-12-24 | 2021-05-11 | 浙江海普发科技有限公司 | Arrester zinc oxide structure of arrester intellectual detection system module and adaptation |
| CN113447685A (en) * | 2021-05-26 | 2021-09-28 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method for shielding surface leakage current of lightning arrester |
| CN115932648A (en) * | 2022-12-30 | 2023-04-07 | 西安远测电力科技有限公司 | Wireless intelligent sensor device for monitoring resistive current of lightning arrester |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849597A (en) * | 2015-05-20 | 2015-08-19 | 南京信息工程大学 | Metal oxide lightning arrester online monitoring method |
| CN106841711A (en) * | 2017-03-09 | 2017-06-13 | 国网福建省电力有限公司 | Lightning arrester live-line test shielding gripper structure and its method of work |
| CN106969798A (en) * | 2017-04-28 | 2017-07-21 | 国网河南省电力公司电力科学研究院 | Humiture monitoring device inside a kind of lightning arrester body |
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| CN107394428B (en) * | 2017-07-31 | 2023-04-07 | 武汉大学 | Grounding system for co-location of shielding type direct current grounding electrode and converter station grounding grid |
| CN107817398A (en) * | 2017-10-18 | 2018-03-20 | 国网黑龙江省电力有限公司检修公司 | Improved lightning arrester on-Line Monitor Device and monitoring method |
| CN112782458A (en) * | 2020-12-24 | 2021-05-11 | 浙江海普发科技有限公司 | Arrester zinc oxide structure of arrester intellectual detection system module and adaptation |
| CN113447685A (en) * | 2021-05-26 | 2021-09-28 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method for shielding surface leakage current of lightning arrester |
| CN115932648A (en) * | 2022-12-30 | 2023-04-07 | 西安远测电力科技有限公司 | Wireless intelligent sensor device for monitoring resistive current of lightning arrester |
| CN115932648B (en) * | 2022-12-30 | 2024-02-02 | 西安远测电力科技有限公司 | Wireless intelligent sensor device for monitoring resistive current of lightning arrester |
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Application publication date: 20150114 |