CN204228800U - A kind of multi-channel DC microampere meter - Google Patents
A kind of multi-channel DC microampere meter Download PDFInfo
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- CN204228800U CN204228800U CN201420587885.5U CN201420587885U CN204228800U CN 204228800 U CN204228800 U CN 204228800U CN 201420587885 U CN201420587885 U CN 201420587885U CN 204228800 U CN204228800 U CN 204228800U
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- Prior art keywords
- lightning arrester
- microammeter
- relay
- parallel
- microampere meter
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- 230000001681 protective effect Effects 0.000 claims description 22
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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Abstract
The utility model provides a kind of multi-channel DC microampere meter, for measuring the Leakage Current of lightning arrester in lightning arrester connected in parallel group, comprise DC microammeter, also comprise the relay group that relay quantity is equal with the quantity of described lightning arrester, one end of each relay output loop is connected with terminals bottom one of them lightning arrester, the other end of each relay output loop is connected in parallel one end of described DC microammeter, the other end ground connection of described DC microammeter, each relay input circuit is connected in parallel external dc power, and switch is respectively equipped with in each relay input circuit.The circuit between lightning arrester and DC microammeter that will measure is connected in available selection, tests, improves the utilization factor of DC microammeter, saved equipment cost with a DC microammeter to multiple lightning arrester, and without the need to reconfiguration line, easy to operate.
Description
Technical field
The utility model relates to the technique device measuring leakage current size, particularly relates to the microampere meter of test many leakage current size of electric lightning under DC high voltage effect parallel with one another.
Background technology
At present, lightning arrester connected in parallel group is when testing pressurization, and need to disconnect the grounding copper bar bottom lightning arrester, series connection enters microampere meter, in order to measure its Leakage Current.Generally can adopt two kinds of metering systems.Mode one, to the bottom of each lightning arrester series connection access one piece of microampere meter, one piece of microampere meter corresponds to a lightning arrester, to measure Leakage Current; Visible, the microampere meter quantity that this metering system needs should equal the quantity of lightning arrester, and when the quantity of lightning arrester is more, then the microampere meter needed is also more, and the utilization factor of microampere meter is lower.Mode two, only adopt one piece of microampere meter, but need, first to the bottom of certain lightning arrester to be tested series connection access one piece of microampere meter, after applied voltage test, to remove microampere meter, again the grounding copper bar bottom this lightning arrester is connected, complete the test to this lightning arrester, then disconnect the grounding copper bar bottom next lightning arrester to be tested, series connection enters microampere meter test, so analogize, until by complete for all test of lightning arresters; This metering system needs repeatedly reconfiguration line, operates comparatively loaded down with trivial details.
Summary of the invention
The purpose of this utility model is to propose a kind of multi-channel DC microampere meter, to overcome existing metering system or to need polylith microampere meter or need the deficiency of repeatedly reconfiguration line.
In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of multi-channel DC microampere meter, for measuring the Leakage Current of lightning arrester in lightning arrester connected in parallel group, comprise DC microammeter, also comprise the relay group that relay quantity is equal with the quantity of described lightning arrester, one end of each relay output loop is connected with terminals bottom one of them lightning arrester, the other end of each relay output loop is connected in parallel one end of described DC microammeter, the other end ground connection of described DC microammeter, each relay input circuit is connected in parallel external dc power, and is respectively equipped with switch in each relay input circuit.
The lightning arrester that selection will be measured, by the break-make of the switch control rule relay input circuit of correspondence, the output loop of then this relay of conducting when relay input circuit closes, and then terminals bottom lightning arrester are connected with DC microammeter, thus measure the Leakage Current of this lightning arrester; When needing to measure other lightning arrester, then the switch that this lightning arrester closed is corresponding, cuts out other switch simultaneously.The circuit between lightning arrester and DC microammeter that will measure is connected in available selection, tests, improves the utilization factor of DC microammeter, saved equipment cost with a DC microammeter to multiple lightning arrester, and without the need to reconfiguration line, easy to operate.
Described multi-channel DC microampere meter also comprises the protective resistance number protective resistance sequence equal with described lightning arrester quantity, and one end of each protective resistance is drawn from the wire between lightning arrester and relay, other end ground connection.Lightning arrester ground connection all the time can be made, formed between lightning arrester and ground when preventing selector switch and open a way, avoid lightning arrester to carry the hidden danger of pressure.
The resistance of described protective resistance is equal with the internal resistance of DC microammeter.The all-in resistance in parallel of DC microammeter and protective resistance can be made to be the half of D.C. voltmeter internal resistance, the twice of DC microammeter reading and the Leakage Current of lightning arrester, thereby simplify the process calculating Leakage Current.
The utility model has the advantages that: simple and reasonable for structure, the circuit between lightning arrester and DC microammeter that will measure is connected in available selection, with a DC microammeter, multiple lightning arrester is tested, improve the utilization factor of DC microammeter, save equipment cost, and it is without the need to reconfiguration line, easy to operate; Lightning arrester ground connection all the time can also be made, formed between lightning arrester and ground when preventing selector switch and open a way, avoid lightning arrester to carry the hidden danger of pressure; The all-in resistance in parallel of DC microammeter and protective resistance can also be made to be the half of D.C. voltmeter internal resistance, the twice of DC microammeter reading and the Leakage Current of lightning arrester, thereby simplify the process calculating Leakage Current.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
Description of reference numerals: 1, lightning arrester group; 2, protective resistance sequence; 3, relay group; 4, DC microammeter; 5, direct supply.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in further detail the utility model below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1, a kind of multi-channel DC microampere meter 4, for measuring the Leakage Current of lightning arrester in lightning arrester connected in parallel group 1, comprise DC microammeter 4, also comprise the relay group 3 that relay quantity is equal with the quantity of described lightning arrester, one end of each relay output loop is connected with terminals bottom one of them lightning arrester, the other end of each relay output loop is connected in parallel one end of described DC microammeter 4, the other end ground connection of described DC microammeter 4, each relay input circuit is connected in parallel external dc power 5, and switch is respectively equipped with in each relay input circuit.
The lightning arrester that selection will be measured, by the break-make of the switch control rule relay input circuit of correspondence, the output loop of then this relay of conducting when relay input circuit closes, and then terminals bottom lightning arrester are connected with DC microammeter 4, thus measure the Leakage Current of this lightning arrester; When needing to measure other lightning arrester, then the switch that this lightning arrester closed is corresponding, cuts out other switch simultaneously.
Further, described multi-channel DC microampere meter 4 also comprises the protective resistance number protective resistance sequence 2 equal with described lightning arrester quantity, and one end of each protective resistance is drawn from the wire between lightning arrester and relay, other end ground connection; The resistance of described protective resistance is equal with the internal resistance of DC microammeter 4.
To be provided with the lightning arrester group 1 of five lightning arresters; as Fig. 1; B1 to B5 represents five lightning arresters respectively; R1 to R5 represents that resistance is the protective resistance of 1K ohm respectively; J1 to J5 represents five relays respectively, and K1 to K5 represents five switches respectively, in actual applications; usual meeting arranges a LED light at each switch place, to show the state of this switch.Such as, when measuring the Leakage Current of lightning arrester B1, first close and press K switch 1, c, d two contacts of relay J 1 input circuit are direct supply 5 conducting of 24V by voltage, the LED light at Simultaneous Switching K1 place lights, and relay K 1 is worked, a, b namely in closing relay K1 output loop two contacts, and then impel lightning arrester B1 to be connected with DC microammeter 4, thus can measure by DC microammeter 4 Leakage Current obtaining lightning arrester B1.Wherein, DC microammeter 4 adopts high-precision metal film resistance, and its internal resistance is chosen as 1K ohm, identical with the resistance of each protective resistance.When measuring the Leakage Current of lightning arrester B1; the mode of connection of protective resistance R1; be actually in parallel with DC microammeter 4; the all-in resistance in parallel of DC microammeter 44 and protective resistance R1 is made to be the half of D.C. voltmeter internal resistance; when leakage current is 1mA; the corresponding voltage flowing through DC microammeter 4 is 0.5V; 2 times of reading are the size of leakage current; if the internal resistance of measuring DC microammeter 4 is the highest by 1mA electric current; so after considering protective resistance shunting, the leakage current scope that this DC microammeter 4 can be measured is 0 ~ 2mA.The protective resistance that each current measurement passage is all parallel with 1k Ω is set and is connected to the earth, being to ensure that switch there will not be unsettled situation in handoff procedure, avoiding high voltage to jeopardize the person and instrument.
After testing lightning arrester B1, if other lightning arrester will be changed into, should first cut-off switch K1, then the switch that closed lightning arrester to be measured is corresponding, during practical operation, can be identified by the LED light of switch.
The utility model is simple and reasonable for structure, and the circuit between lightning arrester and DC microammeter 4 that will measure is connected in available selection, tests multiple lightning arrester with a DC microammeter 4, improve the utilization factor of DC microammeter 4, save equipment cost, and without the need to reconfiguration line, easy to operate; Lightning arrester ground connection all the time can also be made, formed between lightning arrester and ground when preventing selector switch and open a way, avoid lightning arrester to carry the hidden danger of pressure; The all-in resistance in parallel of DC microammeter 4 and protective resistance can also be made to be the half of D.C. voltmeter internal resistance, the twice of DC microammeter 4 reading and the Leakage Current of lightning arrester, thereby simplify the process calculating Leakage Current.
Above-listed detailed description is illustrating for the utility model possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.
Claims (3)
1. a multi-channel DC microampere meter, for measuring the Leakage Current of lightning arrester in lightning arrester connected in parallel group, comprise DC microammeter, it is characterized in that, also comprise the relay group that relay quantity is equal with the quantity of described lightning arrester, one end of each relay output loop is connected with terminals bottom one of them lightning arrester, the other end of each relay output loop is connected in parallel one end of described DC microammeter, the other end ground connection of described DC microammeter, each relay input circuit is connected in parallel external dc power, and switch is respectively equipped with in each relay input circuit.
2. multi-channel DC microampere meter according to claim 1; it is characterized in that; also comprise the protective resistance sequence that protective resistance number is equal with described lightning arrester quantity, one end of each protective resistance is drawn from the wire between lightning arrester and relay, other end ground connection.
3. multi-channel DC microampere meter according to claim 2, is characterized in that, the resistance of described protective resistance is equal with the internal resistance of DC microammeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420587885.5U CN204228800U (en) | 2014-10-11 | 2014-10-11 | A kind of multi-channel DC microampere meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420587885.5U CN204228800U (en) | 2014-10-11 | 2014-10-11 | A kind of multi-channel DC microampere meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204228800U true CN204228800U (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420587885.5U Expired - Lifetime CN204228800U (en) | 2014-10-11 | 2014-10-11 | A kind of multi-channel DC microampere meter |
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| Country | Link |
|---|---|
| CN (1) | CN204228800U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301334A (en) * | 2015-12-10 | 2016-02-03 | 苏州华电电气股份有限公司 | Multichannel direct current high voltage microammeter |
| CN108459208A (en) * | 2018-04-18 | 2018-08-28 | 国家电网公司 | Relative medium is lost and the separate switching device of the remote control of capacitance ratio test |
| CN108872760A (en) * | 2018-04-20 | 2018-11-23 | 国家电网公司 | The auto-changing termination of without disconnecting power lead measurement 220kV Leakage Current of Zinc-oxide Lightning Arresters |
| CN109061349A (en) * | 2018-08-08 | 2018-12-21 | 国网湖南省电力有限公司 | A kind of 10 KV lightning arrester three-phase test devices |
| CN109324214A (en) * | 2018-11-22 | 2019-02-12 | 国网新疆电力有限公司电力科学研究院 | Combined arrester leakage current measurement device |
-
2014
- 2014-10-11 CN CN201420587885.5U patent/CN204228800U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301334A (en) * | 2015-12-10 | 2016-02-03 | 苏州华电电气股份有限公司 | Multichannel direct current high voltage microammeter |
| CN108459208A (en) * | 2018-04-18 | 2018-08-28 | 国家电网公司 | Relative medium is lost and the separate switching device of the remote control of capacitance ratio test |
| CN108872760A (en) * | 2018-04-20 | 2018-11-23 | 国家电网公司 | The auto-changing termination of without disconnecting power lead measurement 220kV Leakage Current of Zinc-oxide Lightning Arresters |
| CN109061349A (en) * | 2018-08-08 | 2018-12-21 | 国网湖南省电力有限公司 | A kind of 10 KV lightning arrester three-phase test devices |
| CN109324214A (en) * | 2018-11-22 | 2019-02-12 | 国网新疆电力有限公司电力科学研究院 | Combined arrester leakage current measurement device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150325 |