CN2779411Y - An air-core coil current sensor for measuring power frequency heavy current - Google Patents
An air-core coil current sensor for measuring power frequency heavy current Download PDFInfo
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- CN2779411Y CN2779411Y CN 200520017006 CN200520017006U CN2779411Y CN 2779411 Y CN2779411 Y CN 2779411Y CN 200520017006 CN200520017006 CN 200520017006 CN 200520017006 U CN200520017006 U CN 200520017006U CN 2779411 Y CN2779411 Y CN 2779411Y
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Abstract
The utility model relates to an air-core coil current sensor for measuring power frequency heavy current, which belongs to the technical field of the sensors. The sensor is mainly composed of an air-core coil wound on a non-magnetic material opening skeleton. The utility model has no ferromagnetic material in the air-core coil, and the air-core coil can not saturate because of heavy measured current so as to have very high linearity. The output voltage value is in direct proportion to a primary side current value in a generating line or a bus bar in the air-core coil current sensor. The utility model can be used in occasions for measuring power frequency heavy current. The sensor only needs to be arranged on one side of the generating line to be measured. The voltage signal output by the air-core coil can improve the utilization accuracy of the subjacent relaying protection devices or other monitoring and measuring devices.
Description
Technical field
The utility model belongs to sensor technical field, particularly measures the current sensor structural design of the big electric current of power frequency.
Background technology
In electric system, often need to measure the big electric current in bus or the bus-bar, adopt traditional current transformer to measure this big electric current usually.Traditional current transformer is a kind of induction equipment with iron core 16, has and change
The structure that depressor is similar: its former limit winding 11 is connected in the bus 12 or bus-bar with big electric current, and its secondary winding 13 is connected with table meter 14 or relay protection device 15, as shown in Figure 1.
In the rated current scope of current transformer (600 amperes of for example former limit winding rated current), it can measure the big electric current in rated range well, be that electric current in the winding of the former limit of current transformer is directly proportional comparatively exactly with electric current in the secondary winding, for example 600 amperes of ratios are 5 amperes, and this scale-up factor is called no-load voltage ratio.
When electric system had an accident, the short-circuit current value in bus or the bus-bar can reach ratings and get tens of times.In last example, rated current is 600 amperes, if short-circuit current multiple is 20, then short-circuit current value can reach 12,000 amperes.Because it is unshakable in one's determination 15 that common current transformer has, under big like this electric current, to take place saturatedly, the numerical value of measuring will no longer accurate, and promptly the current value exported of secondary winding is less than the current value that calculates according to the above ratio.If will be more much smaller than the primary current value of reality with the secondary current last resulting primary current value of no-load voltage ratio on duty that current transformer records.Therefore, Current Transformer just can not be measured the big current value in former limit under short-circuit conditions exactly.The result can cause the protective relaying device misoperation, cause other supervising device instrumentation inaccurate.
Summary of the invention
The purpose of this utility model is for overcoming the weak point of prior art, design a kind of high linearity open-type current sensor of measuring the big electric current of power frequency, be characterized in adopting the air core coil that does not have ferromagnetic material as current sensor, have the very high linearity, can guarantee the accuracy of other supervising device instrumentation.
A kind of hollow coil current-sensing device of measuring the big electric current of power frequency of the utility model design is characterized in that, mainly is made of the air core coil on nonmagnetic substance opening skeleton.
Above-mentioned sensor also can comprise: be surrounded by the insulator that insulating material is made in the outside of this coil, in the inside of insulator a metal tube arranged, be provided with screw thread in the end of metal tube.
Technique effect of the present utility model:
The utility model is not owing to have ferromagnetic material in the air core coil, and it can be not big and saturated because of tested electric current, thereby it has the very high linearity.In this hollow coil current-sensing device, its output voltage numerical value will be directly proportional with the primary current value in bus or the bus-bar.Can be used for measuring the occasion of the big electric current of power frequency, this device is placed on bus to be measured one side gets final product, the voltage signal of air core coil output can improve the relay protection device of subordinate or the accuracy of other monitoring instrumentation equipment utilization.
Description of drawings
Fig. 1 is the structural representation of traditional electromagnetic current transducer.
Fig. 2 is the synoptic diagram of hollow coil current-sensing device of the present utility model.
Fig. 3 is that the utility model sensor output signal and existing electromagnetic current transducer linearity of output signal compare.
Fig. 4 is for measuring the hollow coil current-sensing device and the scheme of installation thereof of the big electric current of power frequency.
The example structure synoptic diagram of Fig. 5 the utility model sensor.
Embodiment
The hollow coil current-sensing device of the big electric current of measurement power frequency of the utility model design reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
The structure of hollow coil current-sensing device of the present utility model as shown in Figure 2.It is a kind of coil on nonmagnetic substance skeleton (not shown), promptly adopts air core coil 21 as current sensor, and this coil is equivalent to the secondary winding of traditional current transformer, and it need not former limit winding.Its method of attachment and traditional current transformer method of attachment are similar: but it need not former limit winding, has the bus of big electric current or the number of turn that bus-bar 22 is equivalent to it and be 1 former limit winding; This hollow coil current-sensing device be placed on bus or bus-bar near, air core coil open circuit or in parallel with the bigger resistance of numerical value.According to electromagnetic induction principle, in this hollow coil current-sensing device, its output voltage numerical value V will be directly proportional with the primary current I value in bus or the bus-bar.
Because do not have ferromagnetic material in the air core coil, it can be not big and saturated because of tested electric current, thereby it has the very high linearity.The voltage signal of air core coil output will be by the relay protection device of subordinate or other monitoring instrumentation equipment utilization.
Fig. 3 is that air core coil output signal of the present utility model and electromagnetic current transducer linearity of output signal compare.Abscissa axis among the figure is primary current I, and ordinate is output current or voltage signal G; From scheming to go up as seen, at primary current I less than its load current value I
0The time, the linearity of electromagnetic current transducer output signal is good; But at primary current than its rated current I
0During big manyfold, because ferromagnetic material is saturated, output signal also occurs saturated, and the linearity of this moment is very poor, shown in the curve S among the figure 2.And for air core coil, no matter primary current is much, its output signal all keeps good linearty, shown in the curve S among the figure 1.
The example structure of sensor of the present utility model as shown in Figure 4.Among the figure, coil 43 is wound on the skeleton 42 of nonmagnetic substance; The output voltage of coil is derived by lead-in wire 46; Be surrounded by the insulator 41 that insulating material is made in the outside of coil, be not subjected to the damage of external high voltage with the protection coil; In the inside of insulator a metal tube 44 is arranged, be used for increasing the physical strength of insulator and play the shielding stray EM field; In the end of metal tube 44 screw thread 45 is arranged, for the usefulness of sensor installation.
The actual application scheme that current sensor of the present utility model is used for measuring the big electric current of three-phase bus as shown in Figure 5.In this programme, adopt sensor 51A, 51B, the 51C of three air core coils, each sensor is placed near corresponding three- phase bus 52A, 52B, the 52C.The output voltage signal of sensor is received in subordinate's electronic equipment and is handled, for the usefulness of relay protection, metering and other monitoring.
Claims (2)
1, a kind of hollow coil current-sensing device of measuring the big electric current of power frequency is characterized in that, mainly is made of the air core coil on nonmagnetic substance opening skeleton.
2, the hollow coil current-sensing device of the big electric current of measurement power frequency as claimed in claim 1, it is characterized in that, described sensor also comprises: be located at the insulator of the insulating material making of this coil outside, be located at a metal tube of the inside of insulator, the end of this metal tube is provided with screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520017006 CN2779411Y (en) | 2005-04-22 | 2005-04-22 | An air-core coil current sensor for measuring power frequency heavy current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520017006 CN2779411Y (en) | 2005-04-22 | 2005-04-22 | An air-core coil current sensor for measuring power frequency heavy current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2779411Y true CN2779411Y (en) | 2006-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520017006 Expired - Fee Related CN2779411Y (en) | 2005-04-22 | 2005-04-22 | An air-core coil current sensor for measuring power frequency heavy current |
Country Status (1)
| Country | Link |
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| CN (1) | CN2779411Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819869A (en) * | 2010-04-19 | 2010-09-01 | 熊江咏 | Electronic current transformer |
| CN101846699A (en) * | 2010-05-28 | 2010-09-29 | 青岛特锐德电气股份有限公司 | Electrical parameter measuring device, system and method |
| CN1967264B (en) * | 2006-10-29 | 2011-02-16 | 长沙同庆电气信息有限公司 | Spiral hollow coil current transformer with compensating coils |
| CN104101775A (en) * | 2013-04-02 | 2014-10-15 | 优利德科技(中国)有限公司 | Current measuring circuit |
| CN104569546A (en) * | 2014-12-28 | 2015-04-29 | 国家电网公司 | High-voltage line current measuring device |
| CN112858765A (en) * | 2020-12-29 | 2021-05-28 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
-
2005
- 2005-04-22 CN CN 200520017006 patent/CN2779411Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967264B (en) * | 2006-10-29 | 2011-02-16 | 长沙同庆电气信息有限公司 | Spiral hollow coil current transformer with compensating coils |
| CN101819869A (en) * | 2010-04-19 | 2010-09-01 | 熊江咏 | Electronic current transformer |
| CN101846699A (en) * | 2010-05-28 | 2010-09-29 | 青岛特锐德电气股份有限公司 | Electrical parameter measuring device, system and method |
| CN104101775A (en) * | 2013-04-02 | 2014-10-15 | 优利德科技(中国)有限公司 | Current measuring circuit |
| CN104569546A (en) * | 2014-12-28 | 2015-04-29 | 国家电网公司 | High-voltage line current measuring device |
| CN104569546B (en) * | 2014-12-28 | 2018-04-10 | 国家电网公司 | A kind of high-voltage line current measuring device |
| CN112858765A (en) * | 2020-12-29 | 2021-05-28 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
| CN112858765B (en) * | 2020-12-29 | 2022-07-19 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060510 Termination date: 20130422 |