CN104991107A - Measurement device of power grid primary current and method thereof - Google Patents
Measurement device of power grid primary current and method thereof Download PDFInfo
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- CN104991107A CN104991107A CN201510465718.2A CN201510465718A CN104991107A CN 104991107 A CN104991107 A CN 104991107A CN 201510465718 A CN201510465718 A CN 201510465718A CN 104991107 A CN104991107 A CN 104991107A
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Abstract
The embodiment of the present invention provides a measurement device of power grid primary current and a method thereof. The measurement device comprises a resistance characteristic measuring unit for measuring the resistance R or impedance Z of a section of transmission line or bus of a grid, a voltmeter which is parallelly connected to two ends of the transmission line or bus and is used for measuring the voltage value U corresponding of the transmission line or bus, and a current calculation unit which is used for calculating the primary current value of the grid according to the U/R or U/Z. According to the scheme of the invention, the use of a current transformer is avoided, thus the cost is reduced, the reliability and stability of system operation are improved, and the service life is extended.
Description
Technical field
The invention belongs to power domain, particularly relate to a kind of measurement mechanism and method of electrical network primary current.
Background technology
The primary current of high-voltage fence is all obtain in secondary side measurement through current transformer in the world at present, specifically as shown in Figure 1, current transformer winding serial connection is as high pressure primary circuit, be connected in series in secondary winding in current transformer into reometer, the current value that reometer records by the current calculation unit in Control Room is multiplied by the no-load voltage ratio I of current transformer
1=I
2(N
2/ N
1) be high pressure primary current.
Along with the rising of line voltage grade, also more and more higher to the insulating requirements of current transformer, manufacturing cost and the operation expense of current transformer are also more and more higher.
Summary of the invention
The object of the present invention is to provide a kind of measurement mechanism and method of electrical network primary current, to solve, to measure at secondary side the cost that the method for electric current brings by current transformer in prior art high, the problem that stability is low.
For achieving the above object, the embodiment of the present invention provides a kind of measurement mechanism of electrical network primary current on the one hand, comprising:
Resistance characteristic measuring unit, for resistance R or the impedance Z of the one section of transmission line of electricity or one section of bus of measuring described electrical network;
Voltage table, is attempted by this section of transmission line of electricity or this section of bus two ends, for measuring this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
Current calculation unit, for calculating the primary current value of described electrical network according to U/R or U/Z.
Preferably, described electrical network is high direct voltage electrical network, and described resistance characteristic measuring unit is microhmmeter, for measuring the resistance R of this section of transmission line of electricity or this section of bus.
Preferably, described electrical network is high direct voltage electrical network, described resistance characteristic measuring unit comprise the length l for measuring this section of transmission line of electricity or this section of bus length measurement unit, for measuring the area measurement unit of the sectional area s of this section of transmission line of electricity or this section of bus and the resistance calculations unit for calculating resistance R according to R=ρ l/s.
Preferably, described electrical network is ac high-voltage electrical network, and described resistance characteristic measuring unit is microhmmeter or double bridge, for measuring the impedance Z of this section of transmission line of electricity or this section of bus.
Preferably, described current calculation unit is a controller be connected with described voltage table by fiber optic cables;
Described magnitude of voltage is sent to controller by fiber optic cables by described voltage table;
Described controller calculates the primary current value of described electrical network according to U/R or U/Z.
The embodiment of the present invention also provides a kind of measuring method of electrical network primary current on the other hand, comprising:
Measure one section of transmission line of electricity of described electrical network or the resistance R of one section of bus or impedance Z;
Measure this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
The primary current value of described electrical network is calculated according to U/R or U/Z.
Preferably, described electrical network is high direct voltage electrical network, and described measuring method is the resistance R using microhmmeter to measure this section of transmission line of electricity or this section of bus;
Preferably, described electrical network is high direct voltage electrical network, and described measuring method is measure length l and the sectional area s of this section of transmission line of electricity or this section of bus, calculates resistance R according to R=ρ l/s.
Preferably, described electrical network is ac high-voltage electrical network, and described measuring method is the impedance Z using microhmmeter or double bridge to measure this section of transmission line of electricity or this section of bus.
Preferably, described measuring method is at this section of transmission line of electricity or this section of bus two ends and connects voltage table to measure this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
Described measuring method also comprises:
Described magnitude of voltage is sent to controller by fiber optic cables by described voltage table;
Described controller calculates the primary current value of described electrical network according to U/R or U/Z.
The present invention is by measuring resistance or the impedance of electrical network one section of power transmission line or one section of bus, and obtain electrical network primary current value in conjunction with the magnitude of voltage of this section of power transmission line or bus, carried out the mode measured by current transformer compared to existing technology, the present invention only needs a resistance/impedance measuring equipment and voltage measuring apparatus as voltage table, thus reduce cost, improve stability.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the measuring principle of prior art of the present invention;
Fig. 2 is embodiment of the present invention method flow diagram;
Fig. 3 is embodiment of the present invention measuring principle schematic diagram.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
Embodiments provide a kind of measuring method of electrical network primary current, as shown in Figure 2, the method comprises the steps:
S11, measure one section of transmission line of electricity of described electrical network or the resistance R of one section of bus or impedance Z.
S12, measure this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus.Concrete can connect a voltage table to measure corresponding magnitude of voltage U at the two ends of this section of transmission line of electricity or bus.
S13, calculate the primary current value of described electrical network according to U/R or U/Z.
Fig. 3 is measuring principle figure of the present invention, and the one section of power transmission line or bus that it illustrates measuring resistance or impedance carries out voltage measurement.And then primary current value can be obtained according to formula U/R or U/Z.
It should be noted that, due to the resistance of transmission line of electricity or bus or impedance very little, therefore need selected range low, the high surveying instrument of resolution is to ensure measuring accuracy.Microhmmeter can be selected in the application to measure.
In the present invention, for carrying out step S13, need the magnitude of voltage recorded to transfer to a current calculation unit or a data presentation device.
As transferred to a current calculation unit, then this current calculation unit needs to know resistance or impedance simultaneously, to calculate current value by formula U/R or U/Z.This resistance or impedance can be manually input to current calculation unit by user after measuring, and the resistance that also measurement of resistance characteristic measuring unit can be obtained by fiber optic cables or impedance transfer are to this current calculation unit.This current calculation unit can be a remote calculator etc., and the magnitude of voltage recorded can be transferred to this current calculation unit by fiber optic cables by voltage table.Certainly, carry out data management for the convenience of the user, this current calculation unit can have the functions such as display, analysis, control, monitoring simultaneously.
As transferred to a data presentation device, then user according to this magnitude of voltage and can measure the resistance that obtain or resistance value manual calculations obtains current value.Same, this resistance or resistance value also can be transferred to data presentation device and check for user.
Be below an embody rule embodiment:
As shown in Figure 3, intercept one section of direct current high tension transmission circuit, prior measurement obtains its resistance, a voltage table is connect at transmission line of electricity two ends, the secondary of voltage table is exported and is connected with the host computer in Control Room by fiber optic cables, store the resistance value recorded in advance in this host computer, after it obtains the magnitude of voltage of voltage table transmission, electrical network primary current value can be obtained according to magnitude of voltage and resistance value.
It should be noted that, this measuring method is applicable to high direct voltage electrical network or ac high-voltage electrical network, and what only record in advance in alternating voltage electrical network is the resistance value of one section of transmission line of electricity or one section of bus.And, can double bridge measurement impedance value be passed through in alternating voltage electrical network.
For high direct voltage electrical network, except using the mode measuring resistance of microhmmeter, can also measure the length l of one section of transmission line of electricity or one section of bus and sectional area s, and and then calculate resistance R according to formula R=ρ l/s, wherein ρ is the resistivity of this section of transmission line of electricity or this section of bus.
The present invention also discloses the measurement mechanism of an electrical network primary current, it comprises:
Resistance characteristic measuring unit, for resistance R or the impedance Z of the one section of transmission line of electricity or one section of bus of measuring described electrical network;
Voltage table, is attempted by this section of transmission line of electricity or this section of bus two ends, for measuring this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
Current calculation unit, for calculating the primary current value of described electrical network according to U/R or U/Z.
When electrical network is high direct voltage electrical network, resistance characteristic measuring unit is microhmmeter, for measuring the resistance R of this section of transmission line of electricity or this section of bus.
In the present invention one specific embodiment, when electrical network is high direct voltage electrical network, described resistance characteristic measuring unit comprise the length l for measuring this section of transmission line of electricity or this section of bus length measurement unit, for measuring the area measurement unit of the sectional area s of this section of transmission line of electricity or this section of bus and the resistance calculations unit for calculating resistance R according to R=ρ l/s.
When electrical network is ac high-voltage electrical network, resistance characteristic measuring unit can adopt microhmmeter or double bridge, for measuring the impedance Z of this section of transmission line of electricity or this section of bus.
Above-mentioned current calculation unit can be a controller be connected with voltage table by fiber optic cables, and wherein magnitude of voltage is sent to controller (host computer namely in said method) by fiber optic cables by voltage table; Controller calculates the primary current value of described electrical network according to U/R or U/Z.
Apparatus of the present invention are corresponding with embodiment of the method, and relevant portion can reference mutually.
Although depict the application by embodiment, those of ordinary skill in the art know, the application has many distortion and change and do not depart from the spirit of the application, and the claim appended by wishing comprises these distortion and change and do not depart from the spirit of the application.
Claims (10)
1. a measurement mechanism for electrical network primary current, is characterized in that, described measurement mechanism comprises:
Resistance characteristic measuring unit, for resistance R or the impedance Z of the one section of transmission line of electricity or one section of bus of measuring described electrical network;
Voltage table, is attempted by this section of transmission line of electricity or this section of bus two ends, for measuring this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
Current calculation unit, for calculating the primary current value of described electrical network according to U/R or U/Z.
2. the measurement mechanism of electrical network primary current as claimed in claim 1, it is characterized in that, described electrical network is high direct voltage electrical network, and described resistance characteristic measuring unit is microhmmeter, for measuring the resistance R of this section of transmission line of electricity or this section of bus.
3. the measurement mechanism of electrical network primary current as claimed in claim 1, it is characterized in that, described electrical network is high direct voltage electrical network, described resistance characteristic measuring unit comprise the length l for measuring this section of transmission line of electricity or this section of bus length measurement unit, for measuring the area measurement unit of the sectional area s of this section of transmission line of electricity or this section of bus and the resistance calculations unit for calculating resistance R according to R=ρ l/s.
4. the measurement mechanism of electrical network primary current as claimed in claim 1, it is characterized in that, described electrical network is ac high-voltage electrical network, and described resistance characteristic measuring unit is microhmmeter or double bridge, for measuring the impedance Z of this section of transmission line of electricity or this section of bus.
5. the measurement mechanism of electrical network primary current as claimed in claim 1, it is characterized in that, described current calculation unit is a controller be connected with described voltage table by fiber optic cables;
Described magnitude of voltage is sent to controller by fiber optic cables by described voltage table;
Described controller calculates the primary current value of described electrical network according to U/R or U/Z.
6. a measuring method for electrical network primary current, is characterized in that, described measuring method comprises:
Measure one section of transmission line of electricity of described electrical network or the resistance R of one section of bus or impedance Z;
Measure this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
The primary current value of described electrical network is calculated according to U/R or U/Z.
7. the measuring method of electrical network primary current as claimed in claim 6, it is characterized in that, described electrical network is high direct voltage electrical network, and described measuring method is the resistance R using microhmmeter to measure this section of transmission line of electricity or this section of bus.
8. the measuring method of electrical network primary current as claimed in claim 6, it is characterized in that, described electrical network is high direct voltage electrical network, and described measuring method is measure length l and the sectional area s of this section of transmission line of electricity or this section of bus, calculates resistance R according to R=ρ l/s.
9. the measuring method of electrical network primary current as claimed in claim 6, it is characterized in that, described electrical network is ac high-voltage electrical network, and described measuring method is the impedance Z using microhmmeter or double bridge to measure this section of transmission line of electricity or this section of bus.
10. the measuring method of electrical network primary current as claimed in claim 6, is characterized in that, described measuring method is at this section of transmission line of electricity or this section of bus two ends and connects voltage table to measure this section of transmission line of electricity or magnitude of voltage U corresponding to this section of bus;
Described measuring method also comprises:
Described magnitude of voltage is sent to controller by fiber optic cables by described voltage table;
Described controller calculates the primary current value of described electrical network according to U/R or U/Z.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510465718.2A CN104991107A (en) | 2015-07-31 | 2015-07-31 | Measurement device of power grid primary current and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510465718.2A CN104991107A (en) | 2015-07-31 | 2015-07-31 | Measurement device of power grid primary current and method thereof |
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| CN104991107A true CN104991107A (en) | 2015-10-21 |
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| CN201510465718.2A Pending CN104991107A (en) | 2015-07-31 | 2015-07-31 | Measurement device of power grid primary current and method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802476A (en) * | 2018-06-13 | 2018-11-13 | 贵州电网有限责任公司 | A kind of DC current transformer and its current test method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04151566A (en) * | 1990-10-15 | 1992-05-25 | Advantest Corp | Calibrating method for dc testing apparatus |
| CN101651084A (en) * | 2008-08-13 | 2010-02-17 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Electrostatic chuck supply current sampling device, method and plasma device |
| CN201697991U (en) * | 2010-06-28 | 2011-01-05 | 青岛艾诺智能仪器有限公司 | Short circuit tester |
| CN102830335A (en) * | 2011-06-16 | 2012-12-19 | 鸿富锦精密工业（深圳）有限公司 | Triode test circuit |
| CN203101484U (en) * | 2013-02-05 | 2013-07-31 | 重庆佩特电气有限公司 | Circuit measurement circuit |
| CN103323647A (en) * | 2013-06-07 | 2013-09-25 | 国家电网公司 | Device and method for monitoring classified insulation electromagnetic type PT primary side current |
| CN103728049A (en) * | 2012-10-10 | 2014-04-16 | 天津赛思科技发展有限公司 | High-voltage power transmission line temperature measurement system |
| CN203759112U (en) * | 2014-03-31 | 2014-08-06 | 深圳市嘉力电气技术有限公司 | High-frequency current detection circuit |
| CN204989289U (en) * | 2015-07-31 | 2016-01-20 | 苏州华电电气股份有限公司 | Measurement device for electric wire netting primary current |
-
2015
- 2015-07-31 CN CN201510465718.2A patent/CN104991107A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04151566A (en) * | 1990-10-15 | 1992-05-25 | Advantest Corp | Calibrating method for dc testing apparatus |
| CN101651084A (en) * | 2008-08-13 | 2010-02-17 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Electrostatic chuck supply current sampling device, method and plasma device |
| CN201697991U (en) * | 2010-06-28 | 2011-01-05 | 青岛艾诺智能仪器有限公司 | Short circuit tester |
| CN102830335A (en) * | 2011-06-16 | 2012-12-19 | 鸿富锦精密工业（深圳）有限公司 | Triode test circuit |
| CN103728049A (en) * | 2012-10-10 | 2014-04-16 | 天津赛思科技发展有限公司 | High-voltage power transmission line temperature measurement system |
| CN203101484U (en) * | 2013-02-05 | 2013-07-31 | 重庆佩特电气有限公司 | Circuit measurement circuit |
| CN103323647A (en) * | 2013-06-07 | 2013-09-25 | 国家电网公司 | Device and method for monitoring classified insulation electromagnetic type PT primary side current |
| CN203759112U (en) * | 2014-03-31 | 2014-08-06 | 深圳市嘉力电气技术有限公司 | High-frequency current detection circuit |
| CN204989289U (en) * | 2015-07-31 | 2016-01-20 | 苏州华电电气股份有限公司 | Measurement device for electric wire netting primary current |
Non-Patent Citations (1)
| Title |
|---|
| 朱福琪: "智能电力测试仪", 《技术监督实用技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802476A (en) * | 2018-06-13 | 2018-11-13 | 贵州电网有限责任公司 | A kind of DC current transformer and its current test method |
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Application publication date: 20151021 |
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