CN104297618B - Arrester with leakage current measurement function - Google Patents
Arrester with leakage current measurement function Download PDFInfo
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- CN104297618B CN104297618B CN201410534755.XA CN201410534755A CN104297618B CN 104297618 B CN104297618 B CN 104297618B CN 201410534755 A CN201410534755 A CN 201410534755A CN 104297618 B CN104297618 B CN 104297618B
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Abstract
The invention discloses a kind of arrester with leakage current measurement function, it is intended to which solving the detection of leakage current in existing arrester, to be vulnerable to strong electromagnetic, signal extraction difficulty big, it is difficult to realizes the technical problem of live monitoring.It includes the outside umbrella cover for sealing, the core group being arranged inside umbrella cover, is provided with the first aluminium electrode, bottom on the top of core group and is provided with leakage current measurement sensor；Leakage current measurement sensor includes the second aluminium electrode, the 3rd aluminium electrode and resistor disc, and the detection positive pole P+ being drawn out to outside umbrella cover is provided with the second aluminium electrode, and detection negative pole P is led in the 3rd aluminium electrode bottom；Resistor disc is formed in parallel by a sampling resistor R and a protection valve block Z6.Arrester and leakage current measurement sensor integrated setting are connected to measuring instrument by the present invention by extraction electrode, on the premise of the lightning-arrest effect of lightning arrester body is not influenceed, realize the live monitoring of lightning arrester leakance.
Description
Technical field
The present invention relates to arrester live monitoring technical field, and in particular to a kind of lightning-arrest with leakage current measurement function
Device.
Background technology
Atmospheric electrical phenomena in air can bring harm to the existence of the mankind and social activities, and the protection to thunder and lightning is always people
Concern.If arrester is the important protection element on power circuit, after power circuit is struck by lightning, arrester two
When overvoltage occurs in end, arrester turns to low impedance state from high impedance change, thunder-strike current of releasing rapidly, so as to reach to electric power
The protective effect of equipment.Arrester in working order when two ends persistently bear operating voltage, the arrester in rated operational voltage
High impedance is presented, now has faint leakage current and flows through arrester into the earth, accurate measurement simultaneously analyzes arrester in work shape
The leakage current of state may determine that the performance quality of arrester, and this chargeding performance monitoring to arrester is significant.And mesh
Before, must stop transport main equipment when being detected to the existing arrester service behaviour for working online, after arrester is powered off again
Tested, and the live detection of arrester presence cannot be realized.And once carry out power failure detection, then can be to electricity consumer
Production, life make a big impact, and cause the loss that cannot be retrieved；And if the long-term service behaviour not to online arrester is entered
Row detection, then cannot early find and exclude the potential safety hazard existing for it.
For a long time, above-mentioned technical problem is difficult to the reason for achieving a solution and is, electric leakage of the arrester under operating voltage
Stream it is smaller, an intact 10kV leakage conductor under operating voltage, leakage current probably within 100 μ A, with voltage etc.
The different leakage current values of level can be variant, but the basis for estimation current in resistance property of arrester performance quality often just accounts for leaked hunting electric current
More than ten percent, by taking 10kV circuits as an example, also with regard to more than ten μ A, the nuance of current in resistance property can be directly affected to arrester
The judged result of quality.Arrester is connected on power circuit, is often operated under strong electromagnetic interference environment, signal extraction difficulty
Greatly, so where to the accurate measurement of leakage current being also the difficult point for studying arrester on-line monitoring technique.
The content of the invention
Present invention seek to address that the detection of leakage current is vulnerable to strong electromagnetic, signal extraction difficulty in existing arrester
Greatly, it is difficult to realize the technical problem of arrester chargeding performance monitoring.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of arrester with leakage current measurement function of design, including outside sealing umbrella cover, be arranged at the umbrella cover
The internal core group being made up of at least one metal oxide valve block, the first aluminium electrode, bottom are provided with the top of the core group
It is provided with leakage current measurement sensor；
The leakage current measurement sensor includes the second aluminium electrode, the 3rd aluminium electrode and is arranged at the second aluminium electricity
Resistor disc between pole and the 3rd aluminium electrode, second aluminium electrode is arranged at the bottom of the core group, in second aluminium electricity
The detection positive pole P+ being drawn out to outside the umbrella cover is provided with extremely, detection negative pole P- is led in the 3rd aluminium electrode bottom；
The resistor disc is formed in parallel by a sampling resistor R and a protection valve block Z6, and the protection valve block Z6 is metal oxide
Valve block；Upper end cover and bottom end cover are respectively arranged with the upper and lower ends of the umbrella cover.
In the above-mentioned technical solutions, in arrester built with leakage current measurement sensor, in the leakage current measurement sensor
Lightning arrester leakance is transformed to voltage signal and drawn by interior utilization resistance, and the change of lightning arrester leakance is worth to according to the voltage
Change situation, realizes the live detection of lightning arrester leakance.The setting of valve block is protected, on the one hand for protecting sampling resistor, separately
On the one hand leakage current can be bypassed when lightning arrester body is struck by lightning, it is to avoid influence of the sampling resistor to effect of taking shelter from the thunder.
Preferably, the metal oxide valve block for constituting the core group is zinc oxide（ZnO）Valve block.
Preferably, the protection valve block Z6 is zinc oxide（ZnO）Valve block.
Preferably, residual voltage values of the protection valve block Z6 under 8/20us nominal currents is let out more than the maximum of tested arrester
Leakage current produces 2~50 times of pressure drop on sampling resistor R, and system nominal voltage less than tested arrester percent
Ten.
Preferably, residual voltage values of the protection valve block Z6 under 8/20us nominal currents is 20V~800V.
Preferably, the square wave discharge capacity of the protection valve block Z6,4/10us dash currents capacity are kept away more than or equal to tested
The square wave discharge capacity of thunder device, 4/10us dash current capacity.
Preferably, the resistance value of the sampling resistor R is 50m Ω~100 Ω.
Preferably, the umbrella cover is silicone rubber seal body.
Preferably, the detection positive pole and detection negative pole are stainless steel.
The beneficial effects of the present invention are：
1. the low-pressure end of the core group being made up of metal oxide valve block in arrester sets leakage current measurement sensor, makes
Core group lower end is grounded again by a resistor disc, and the leakage current for flowing through arrester produces pressure drop on resistor disc, by measurement two
Voltage on individual leading-out terminal P+ and P- just can obtain the change of lightning arrester leakance, so as to realize to lightning arrester leakance
Accurate measurement.
2. in the low residual voltage metal oxide protection valve block Z6 in one in parallel of sampling resistor R two ends, the residual voltage of the protection valve block
It is far longer than the magnitude of voltage at operating voltage down-sampling resistance two ends（5 μ V~10mV）, it is far smaller than again supporting arrester
Continuous running voltage value, by taking 10kV Line ZnO Surge Arresters as an example, the residual voltage value of protection valve block Z6 selects 200V or so.Thus can be with
When arrester is struck by lightning, it is to avoid pressure very high is produced on sampling resistor R because the transient current for flowing through arrester increases
Drop, influences the protection effect of arrester, while protect sampling resistor R not to be burned out, it is ensured that sensor it is normal using simultaneously gram
Influence of the presence of sampling resistor to the lightning-arrest effect of arrester is taken.
3. arrester of the present invention with leakage current measurement function, sets arrester is integrated with leakage current measurement sensor
Put, simple structure is easy for installation, realize the live monitoring of lightning arrester leakance, small current measurement is transformed to voltage measurement,
And measuring instrument is drawn out to by electrode, and subsequently measured, on the premise of the lightning-arrest effect of lightning arrester body is not influenceed, overcome
It is vulnerable to the big problem of strong electromagnetic, signal extraction difficulty in lightning arrester leakance detection process in the prior art, for
Research arrester live detection technology has great impetus.
Brief description of the drawings
Fig. 1 is the structural representation of arrester of the present invention with leakage current measurement function.
Fig. 2 is the circuit connection diagram of arrester of the present invention with leakage current measurement function.
Wherein, 1 is umbrella cover；2 is core group；3 is the first aluminium electrode；4 is the second aluminium electrode；5 is the 3rd aluminium electrode；6 is electricity
Resistance piece；7 is detection positive pole P+；8 is detection negative pole P-；9 is upper end cover；10 is bottom end cover.
Specific embodiment
Specific embodiment of the invention is illustrated with reference to the accompanying drawings and examples, but following examples are used only in detail
Describe the bright present invention in detail, the scope of the present invention is limited never in any form.
Embodiment 1：A kind of arrester with leakage current measurement function, the arrester is used for the protection of 10kV circuits, bag
The umbrella cover 1 for including outside sealing, the core group 2 being made up of at least one metal oxide valve block being arranged inside umbrella cover 1, in core group
2 top is provided with the first aluminium electrode 3, bottom and is provided with leakage current measurement sensor；Leakage current measurement sensor includes the second aluminium electricity
Pole 4, the 3rd aluminium electrode 5 and the resistor disc 6 being arranged between the second aluminium electrode 4 and the 3rd aluminium electrode 5, the second aluminium electrode 4 set
The bottom of core group 2 is placed in, the detection positive pole 7 being drawn out to outside umbrella cover 1 is provided with the second aluminium electrode 4（P+）, in the 3rd aluminium electricity
The bottom of pole 5 leads to detection negative pole 8（P-）；Resistor disc 6 is formed in parallel by a sampling resistor R and a protection valve block Z6, is protected
Shield valve block Z6 is the metal oxide valve block of 200V, the resistance of sampling resistor R from the residual voltage value under 8/20us nominal currents
It is 100m Ω to be worth；Upper end cover 9 and bottom end cover 10 are respectively arranged with the upper and lower ends of umbrella cover 1.Wherein, the metal of composition core group 2
Oxide valve block is zinc oxide（ZnO）Valve block；Protection valve block Z6 is also zinc oxide（ZnO）Valve block, umbrella cover 1 is silicone rubber seal
Body, detection positive pole 7 and detection negative pole 8 are stainless steel.
Wherein, to the selection of protection valve block Z6, residual voltage values of the protection valve block Z6 under 8/20us nominal currents should be made big
2~50 times of pressure drop are produced on sampling resistor R in tested arrester working condition leakage current, and less than tested arrester
The 10 of system nominal voltage, and every discharge capacity index of claimed valve block Z6 is more than or equal to tested arrester
Discharge capacity index, such as the square wave discharge capacity of protection valve block Z6,4/10us dash currents capacity are more than or equal to tested arrester
Square wave discharge capacity, 4/10us dash current capacity.
Embodiment 2：A kind of arrester with leakage current measurement function, the difference with embodiment 1 is to protect valve
Residual voltage values of the piece Z6 under 8/20us nominal currents is 100V, and the resistance value of sampling resistor R is 50 Ω.
Embodiment 3：A kind of arrester with leakage current measurement function, the arrester is used for the protection of 110kV circuits, its
Structure is same as Example 1, and difference is that residual voltage values of the protection valve block Z6 under 8/20us nominal currents is 350V, is adopted
The resistance value of sample resistance R is 5 Ω.
Embodiment 4：A kind of arrester with leakage current measurement function, the difference with embodiment 3 is to protect valve
Residual voltage values of the piece Z6 under 8/20us nominal currents is 100V, and the resistance value of sampling resistor R is 200m Ω.
In the embodiment above, it is required to protect residual voltage values of the valve block Z6 under 8/20us nominal currents lightning-arrest more than tested
Device working condition leakage current produces 2~50 times of pressure drop on sampling resistor R, and less than the system nominal electricity of tested arrester
The 10 of pressure, and every discharge capacity index of claimed valve block Z6 is more than or equal to the discharge capacity of tested arrester and refers to
The square wave that mark, such as the square wave discharge capacity of protection valve block Z6,4/10us dash currents capacity are more than or equal to tested arrester is through-flow
Capacity, 4/10us dash current capacity, the requirement of the selection gist measuring instrument of specific resistance can again go adjustment.Involved by other
And instrument and equipment unless otherwise instructed, be routine instrument device.
The specific works mode of arrester of the present invention with leakage current measurement function be：
Sampling resistor and protection valve block is in parallel, use lightning arrester body leakage current by resistance conversion to measure voltage
Method, and using metal oxide valve block protect sampling resistor method, for the detection of lightning arrester leakance.
As a example by arrester for 10kV circuits, in order to accurate measurement arrester is in the leakage current value of operating voltage,
Leakage current measurement sensor is installed additional in arrester inner core group low-pressure end, as shown in Figure 1 and Figure 2.Z1~Z5 is that 10kV takes shelter from the thunder in Fig. 1
5 metal oxide valve blocks of device, its upper end connection 10kV buses, lower end is grounded again by sampling resistor R, flows through arrester
Leakage current produces pressure drop on sampling resistor R, just can be obtained by the magnitude of voltage on measurement two leading-out terminals P+ and P- and kept away
The changing value of thunder device leakage current.
When operating voltage is born at arrester two ends, the leakage current very little that arrester flows through is produced equally on sampling resistor R
Pressure drop also very little, the normal work on arrester do not influence；But when arrester is subjected to thunderbolt voltage, flow through arrester
Electric current can increase to thousands of to amperes up to ten thousand moment, and this electric current will produce pressure drop very high on sampling resistor R, this pressure drop
Presence on the one hand have influence on the protection effect of arrester, on the other hand produce very big heat in moment, be easily caused sampling electricity
Resistance R burns.Therefore, in sampling resistor R two ends a piece of low residual voltage metal oxide protection valve block Z6 in parallel, as shown in Fig. 2 the guarantor
The residual voltage of shield valve block is far longer than the magnitude of voltage at operating voltage down-sampling resistance two ends（5 μ V~10mV）, and far smaller than institute
The protection magnitude of voltage of supporting arrester, for example：10kV circuits select the valve block of 200V or so, in arrester working condition, are in
The resistance characteristic of existing 50m Ω~100 Ω, when arrester is subjected to thunderbolt enters guard mode, low residual metal oxide protection valve
Piece Z6 punctures, and low impedance state is presented, can be by specified leakage current.The effect of protection sampling resistor R has thus been reached, and
Avoid the influence to arrester protection effect.The circuit connecting mode of arrester of the present invention is in Fig. 2 shown in dotted line frame.
The present invention is described in detail above in conjunction with drawings and Examples, but, those of skill in the art
Member to the design parameter of each in above-described embodiment it is understood that on the premise of present inventive concept is not departed from, can also carry out
Change, forms multiple specific embodiments, is common excursion of the invention, no longer describes in detail one by one herein.
Claims (9)
1. a kind of arrester with leakage current measurement function, it is characterised in that the umbrella cover including outside sealing, be arranged at it is described
The core group being made up of at least one metal oxide valve block inside umbrella cover, the top of the core group be provided with the first aluminium electrode,
Bottom is provided with leakage current measurement sensor；
The leakage current measurement sensor include the second aluminium electrode, the 3rd aluminium electrode and be arranged at second aluminium electrode and
Resistor disc between 3rd aluminium electrode, second aluminium electrode is arranged at the bottom of the core group, in second aluminium electrode
The detection positive pole P+ being drawn out to outside the umbrella cover is provided with, detection negative pole P- is led in the 3rd aluminium electrode bottom；It is described
Resistor disc is formed in parallel by a sampling resistor R and a protection valve block Z6, and the protection valve block Z6 is metal oxide valve block；
Upper end cover and bottom end cover are respectively arranged with the upper and lower ends of the umbrella cover.
2. the arrester with leakage current measurement function according to claim 1, it is characterised in that the composition core group
Metal oxide valve block is zinc oxide（ZnO）Valve block.
3. the arrester with leakage current measurement function according to claim 1, it is characterised in that the protection valve block Z6
It is zinc oxide（ZnO）Valve block.
4. the arrester with leakage current measurement function according to claim 3, it is characterised in that the protection valve block Z6
The maximum leakage electric current that residual voltage value under 8/20us nominal currents is more than tested arrester produces pressure drop on sampling resistor R
2~50 times, and system nominal voltage less than tested arrester 10.
5. the arrester with leakage current measurement function according to claim 3, it is characterised in that the protection valve block Z6
Residual voltage value under 8/20us nominal currents is 20V~800V.
6. the arrester with leakage current measurement function according to claim 4 or 5, it is characterised in that the protection valve
The square wave discharge capacity of piece Z6,4/10us dash currents capacity are more than or equal to square wave discharge capacity, the 4/10us of tested arrester
Dash current capacity.
7. the arrester with leakage current measurement function according to claim 1, it is characterised in that the sampling resistor R
Resistance value be 50m Ω~5 Ω.
8. the arrester with leakage current measurement function according to claim 1, it is characterised in that the umbrella cover is silicon rubber
Glue seal.
9. the arrester with leakage current measurement function according to claim 1, it is characterised in that the detection positive pole and
Detection negative pole is stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410534755.XA CN104297618B (en) | 2014-10-12 | 2014-10-12 | Arrester with leakage current measurement function |
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| CN201410534755.XA CN104297618B (en) | 2014-10-12 | 2014-10-12 | Arrester with leakage current measurement function |
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| CN104297618A CN104297618A (en) | 2015-01-21 |
| CN104297618B true CN104297618B (en) | 2017-06-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107677880A (en) * | 2017-11-22 | 2018-02-09 | 国网四川省电力公司电力科学研究院 | A kind of overvoltage intelligent identifying system based on the monitoring of leakage conductor tail current |
| CN109448942B (en) * | 2018-12-13 | 2024-03-12 | 合肥金瑞配网电气设备有限公司 | Lightning arrester with voltage monitoring interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1091835A (en) * | 1993-11-10 | 1994-09-07 | 江苏省电力试验研究所 | Lightning arrester leakance detects and discharge counter |
| CN201204107Y (en) * | 2008-06-20 | 2009-03-04 | 窦建中 | Integrated intelligent prewarning type metal-oxide arrester |
| CN101425353A (en) * | 2008-12-10 | 2009-05-06 | 王国才 | Non-residual pressure monitor for lightning arrester |
| CN102156241A (en) * | 2011-05-31 | 2011-08-17 | 江苏省电力公司连云港供电公司 | On-line monitoring unit for leakage current of zinc oxide arrester |
| CN102280234A (en) * | 2010-06-11 | 2011-12-14 | 吴昌德 | Arrester with series gaps capable of measuring leakage currents of valve block |
| CN102944727A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Switchgear arrester leakage current sampling device |
| CN204116519U (en) * | 2014-10-12 | 2015-01-21 | 胡智宏 | There is the lightning arrester of leakage current measurement function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10255953A (en) * | 1997-03-06 | 1998-09-25 | Mitsubishi Electric Corp | Leak current detecting device for arrester |
-
2014
- 2014-10-12 CN CN201410534755.XA patent/CN104297618B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1091835A (en) * | 1993-11-10 | 1994-09-07 | 江苏省电力试验研究所 | Lightning arrester leakance detects and discharge counter |
| CN201204107Y (en) * | 2008-06-20 | 2009-03-04 | 窦建中 | Integrated intelligent prewarning type metal-oxide arrester |
| CN101425353A (en) * | 2008-12-10 | 2009-05-06 | 王国才 | Non-residual pressure monitor for lightning arrester |
| CN102280234A (en) * | 2010-06-11 | 2011-12-14 | 吴昌德 | Arrester with series gaps capable of measuring leakage currents of valve block |
| CN102156241A (en) * | 2011-05-31 | 2011-08-17 | 江苏省电力公司连云港供电公司 | On-line monitoring unit for leakage current of zinc oxide arrester |
| CN102944727A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Switchgear arrester leakage current sampling device |
| CN204116519U (en) * | 2014-10-12 | 2015-01-21 | 胡智宏 | There is the lightning arrester of leakage current measurement function |
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| CN104297618A (en) | 2015-01-21 |
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