CN105334375A - PT-CT combined device capable of being installed in charged mode - Google Patents
PT-CT combined device capable of being installed in charged mode Download PDFInfo
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- CN105334375A CN105334375A CN201510867888.3A CN201510867888A CN105334375A CN 105334375 A CN105334375 A CN 105334375A CN 201510867888 A CN201510867888 A CN 201510867888A CN 105334375 A CN105334375 A CN 105334375A
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Abstract
The invention discloses a PT-CT combined device capable of being installed in a charged mode. The PT-CT combined device comprises an A-phase detection unit, a B-phase detection unit, a C-phase detection unit, a control module, a wireless communication module and a low-voltage side energy supply module; the A-phase detection unit, the B-phase detection unit and the C-phase detection unit each comprises a high-voltage equipotential open current transformer, a high-voltage equipotential current sampling module, a capacitance type energy taking transformer, a high-voltage equipotential voltage energy taking power supply module, an electronic voltage transformer and a voltage signal sampling module. According to the PT-CT combined device capable of being installed in the charged mode, high-voltage electricity acquisition can be performed on the continuous electricity condition, and potential hazards cannot be caused to safe operation of a power grid when the device is installed and used in large area.
Description
Technical field
The present invention relates to supply line's voltage and current detecting device, especially relate to a kind of can PT, CT combination unit of charged installation.
Background technology
Along with development and the enforcement of intelligent power grid technology, often need from electric system, extract different occasion electric current, voltage signal, and transfer to corresponding application system, for the application of the aspects such as electric energy quality monitoring and improvement, distribution automation, electric network information transparence provides reliably signal source, corresponding application system is played one's part to the full.
To improve the quality of power supply of electrical network, first by appropriate detecting element, accurate determination and analysis to be made to voltage, electric current, measure the quality of power supply level of electrical network, and analyze and judge to cause the reason of various power quality problem, for the improvement of the quality of power supply provides foundation.10kV power distribution network is as the supply network of final power consumer, and branch is the widest, net structure and load variations is the most complicated, owing to being directly connected to supply load, its quality of power supply is vulnerable to impact most.From whole network system, improve distribution network electric energy quality level great to the contribution improving whole electrical network quality of power supply level; From the power supply function that power distribution network is formed a connecting link, the more and more necessary of directly carrying out electric energy quality monitoring from high-pressure side is increased, effectively the quality of power supply of 10kV power distribution network is optimized raising, directly decide the quality of power supply of upstream electrical network and downstream user.But because user requires more and more higher to power supply reliability, power cut construction is more and more difficult, and most quality of power supply on-line monitoring needs to carry out charged installing additional in existing operation electrical network, but high pressure conventional electromagnetic mutual inductor cannot charged installation under the condition that do not have a power failure of not breaking, and because having easy magnetic saturation, measurement range and response band narrow, easy ferroresonance, the principle defects such as oneself power consumption is large, and circuit ferroresonance point can be increased after a large amount of installation, increase the circuit defect causing power grid security economic operation level to reduce such as idle, make existing equipment cannot meet the distribution networking of power grid user to fast and flexible, to obtain the demand of large data.
Publication number: 201310500019.8, name is called: the patent of invention of voltage transformer (VT), disclose a kind of voltage transformer (VT), comprise epoxy resin mixed glue layer, winding, Secondary Winding, an iron core, the hollow cylinder iron core of the iron core of mutual inductor to be the cross section of the curling coiling of cold rolled grain oriented silicon steel band be annular, iron core is wound with Secondary Winding, be wound with a winding outside Secondary Winding, epoxy resin mixed glue layer is wrapped in the current transformer body periphery be made up of winding, Secondary Winding, an iron core.The core material application computer design sawing sheet technology of mutual inductor, the cold rolled grain orientation silicon steel tape wrapping of the minimum high magnetic flux density of iron loss is adopted to make, core section is round, thus not cutting magnetic line, air-gap-free in magnetic circuit, magnetostrictive force is easy to be absorbed, iron core is after strict annealing process process, it is little that material magnetic property is recovered leakage field comprehensively, loss is low, temperature rise is low, noise is low, bear the advantage that overload ripple dynamic property is good, but this voltage transformer (VT) can not carry out high pressure electric quantity acquisition at not powering-off state, and easily impact to electric power netting safe running when large area is installed.
Summary of the invention
In view of this, the object of the invention is for the deficiencies in the prior art, there is provided a kind of can PT, CT combination unit of charged installation, solve the electric power netting safe running problem that prior art causes under can not carrying out high pressure electric quantity acquisition and large area installation situation at not powering-off state.
For achieving the above object, the present invention by the following technical solutions:
A kind of can the PT of charged installation, CT combination unit, comprises A phase detecting unit, B phase detecting unit, C phase detecting unit, control module, wireless communication module and low-pressure side energising power module, described A phase detecting unit, B phase detecting unit and C phase detecting unit include high pressure equipotential opening current transformer, high pressure equipotential electric current sampling module, capacitor type gets energy mutual inductor, high pressure equipotential voltage draw-out power supply module, electronic type voltage transformer and voltage signal sampling module, described high pressure equipotential electric current sampling module respectively with high pressure equipotential opening current transformer, high pressure equipotential voltage draw-out power supply module and control module electrical connection, described capacitor type get can mutual inductor be electrically connected with high pressure equipotential voltage draw-out power supply module and described low-pressure side energising power module respectively, described voltage signal sampling module respectively with electronic type voltage transformer, control module and the electrical connection of low-pressure side energising power module, described wireless communication module is electrically connected with described control module, described low-pressure side energising power module is electrically connected with described control module, and described high pressure equipotential opening current transformer is arranged at equipotential high-pressure side.
Preferably, described control module comprises controller, and described controller adopts STM32F4 chip.
Preferably, described wireless communication module comprises GPRS module and Zigbee wireless communication module, and described GPRS module is all connected with the communication port of described controller with Zigbee wireless communication module.
Preferably, described capacitor type is got in energy mutual inductor and high pressure equipotential voltage draw-out power supply module and is provided with fuse.
Preferably, the described output terminal of high pressure equipotential electric current sampling module and the signal input part of control module pass through Fiber connection.
The invention has the beneficial effects as follows:
1, the high pressure equipotential opening current transformer that adopts of the present invention, it has stable, reliable operation and blanket advantage.
2, the electric current in the present invention, voltage and electric energy are got and all can be adopted three element design by mutual inductor, high pressure equipotential opening current transformer is placed in equipotential high-pressure side, and current acquisition calculating and collection plate energy supply is completed in high-pressure side, current acquisition amount is transmitted through the fiber to secondary side control module, the basic electric parameters such as effective value, power, frequency can be obtained by fft analysis, and send to host computer to process by wireless transport module.
3, the invention solves can the consistency of performance of high pressure electric quantity collector of charged installation and integrity problem, removes technology barrier for it uses in enormous quantities.
4, communication module of the present invention has GPRS module and Zigbee wireless communication module, can realize the radio communication of short distance and long distance, ensure that the reliability of communication.
Accompanying drawing explanation
Fig. 1 is composition structured flowchart of the present invention;
Fig. 2 is the composition structured flowchart of control module of the present invention;
Fig. 3 is the circuit theory diagrams of high pressure equipotential voltage draw-out power supply module;
In figure: 1-A phase detecting unit, 2-B phase detecting unit, 3-C phase detecting unit, 4-control module, 5-wireless communication module, 6-low-pressure side energising power module, 11-high pressure equipotential opening current transformer and, 12-high pressure equipotential electric current sampling module, 13-capacitor type are got can mutual inductor, 14-high pressure equipotential voltage draw-out power supply module, 15-electronic type voltage transformer, 16-voltage signal sampling module.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the present invention includes A phase detecting unit 1, B phase detecting unit 2, C phase detecting unit 3, control module 4, wireless communication module 5 and low-pressure side energising power module 6, A phase detecting unit 1, B phase detecting unit 2 and C phase detecting unit 3 include high pressure equipotential opening current transformer 11, high pressure equipotential electric current sampling module 12, capacitor type gets energy mutual inductor 13, high pressure equipotential voltage draw-out power supply module 14, electronic type voltage transformer 15 and voltage signal sampling module 16, high pressure equipotential electric current sampling module 12 respectively with high pressure equipotential opening current transformer 11, high pressure equipotential voltage draw-out power supply module 14 and control module electrical connection, capacitor type is got and can be electrically connected with high pressure equipotential voltage draw-out power supply module 14 and low-pressure side energising power module 6 respectively by mutual inductor 13, voltage signal sampling module 16 respectively with electronic type voltage transformer 15, control module and low-pressure side energising power module 6 are electrically connected, wireless communication module 5 is electrically connected with control module, low-pressure side energising power module 6 is electrically connected with control module, high pressure equipotential opening current transformer 11 is arranged at equipotential high-pressure side, capacitor type is got and can be respectively high pressure equipotential voltage draw-out power supply module 14 and low-pressure side energising power module 6 supply of electrical energy by mutual inductor 13.
High pressure equipotential opening current transformer 11 inside is provided with opening Luo-coil, opening Luo-coil carries out current measurement based on electromagnetic induction principle, by induction Primary Conductor (i.e. a winding) changes of magnetic field around, indirectly to measure current value, opening Luo-coil serves as the function of basic sensitive element.
High pressure equipotential voltage draw-out power supply module 14 carries out voltage measurement based on series capacitance voltage divider principle, dividing potential drop is carried out by the distribution of height pressure arm capacitor's capacity, and by the change of measuring low-voltage arm terminal voltage with measuring voltage value, wherein height pressure arm derided capacitors serves as the function of basic sensitive element.
Capacitor type is got and can be carried out dividing potential drop based on series capacitance voltage divider principle equally by mutual inductor 13, unlike being regarded as a current source, and is undertaken getting stream by low-voltage arm.
Control module 4 comprises controller, controller adopts STM32F4 chip, the output terminal of high pressure equipotential electric current sampling module 12 and the signal input part of control module 4 pass through Fiber connection, ensure that signal not by extraneous electromagnetic interference (EMI), wireless communication module 5 comprises GPRS module and Zigbee wireless communication module 5, GPRS module is all connected by signal wire with the communication port of controller with Zigbee wireless communication module 5, according to the far and near requirement of communication distance, can choose different communication modes.
High pressure equipotential electric current sampling module 12 and voltage signal sampling module 16 inside all have signal conditioning circuit, signal conditioning circuit comprises signal amplification circuit and A/D change-over circuit, and the voltage and current signal of mutual inductor collection changes the digital signal that controller can identify and process into after the process of signal conditioning circuit.
Capacitor type is got and can be provided with fuse in mutual inductor 13 and high pressure equipotential voltage draw-out power supply module 14, when there is short-circuit conditions in circuit, can available protecting capacitor type get can the safety of mutual inductor 13 and high pressure equipotential voltage draw-out power supply module 14.
The composition structure of control module as shown in Figure 2, the digital signal that controller receiver voltage signal sampling module 16 and high pressure equipotential electric current sampling module 12 gather, carry out after interpolation synchronously processes, the basic electrically ginseng such as effective value, power, frequency is obtained by fft analysis, electric energy, the electric power quality parameters such as electric current and voltage harmonic wave harmonic power, are stored in nonvolatile memory after rough estimates are analyzed.And communication module receives teleinstruction by GPRS, the data stored in nonvolatile memory are sent.
The electrical schematic diagram of high pressure equipotential voltage draw-out power supply module 14 as shown in Figure 3, high voltage arm capacitor C1 and low-voltage arm electric capacity C2 forms a voltage divider, high input voltage HV is assigned in voltage range that subsequent conditioning circuit can bear, the low pressure that dividing potential drop obtains exports from C2 two ends, direct current and C3 filtering is rectified into through rectifier bridge B, obtain the high direct voltage of relative smooth, and then be converted to through DC/DC (DC-DC) transducer the 5V voltage that secondary singal treatment circuit can directly use, voltage stabilizing diode D is for limiting the high direct voltage amplitude after rectification, to protect DC/DC transducer.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, other amendments that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (5)
1. one kind can the PT of charged installation, CT combination unit, is characterized in that: comprise A phase detecting unit, B phase detecting unit, C phase detecting unit, control module, wireless communication module and low-pressure side energising power module, described A phase detecting unit, B phase detecting unit and C phase detecting unit include high pressure equipotential opening current transformer, high pressure equipotential electric current sampling module, capacitor type gets energy mutual inductor, high pressure equipotential voltage draw-out power supply module, electronic type voltage transformer and voltage signal sampling module, described high pressure equipotential electric current sampling module respectively with high pressure equipotential opening current transformer, high pressure equipotential voltage draw-out power supply module and control module electrical connection, described capacitor type get can mutual inductor be electrically connected with high pressure equipotential voltage draw-out power supply module and described low-pressure side energising power module respectively, described voltage signal sampling module respectively with electronic type voltage transformer, control module and the electrical connection of low-pressure side energising power module, described wireless communication module is electrically connected with described control module, described low-pressure side energising power module is electrically connected with described control module, and described high pressure equipotential opening current transformer is arranged at equipotential high-pressure side.
2. according to claim 1 can PT, CT combination unit of charged installation, it is characterized in that: described control module comprises controller, described controller adopts STM32F4 chip.
3. according to claim 1 and 2 can PT, CT combination unit of charged installation, it is characterized in that: described wireless communication module comprises GPRS module and Zigbee wireless communication module, and described GPRS module is all connected with the communication port of described controller with Zigbee wireless communication module.
4. according to claim 1 can PT, CT combination unit of charged installation, it is characterized in that: described capacitor type is got and can be provided with fuse in mutual inductor and high pressure equipotential voltage draw-out power supply module.
5. according to claim 1 can PT, CT combination unit of charged installation, it is characterized in that: the described output terminal of high pressure equipotential electric current sampling module and the signal input part of control module pass through Fiber connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510867888.3A CN105334375A (en) | 2015-12-01 | 2015-12-01 | PT-CT combined device capable of being installed in charged mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510867888.3A CN105334375A (en) | 2015-12-01 | 2015-12-01 | PT-CT combined device capable of being installed in charged mode |
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| CN105334375A true CN105334375A (en) | 2016-02-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953410A (en) * | 2017-04-27 | 2017-07-14 | 国网福建省电力有限公司 | A kind of low-voltage power network monitoring terminal and monitoring system |
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | composite current frequency sensor |
| CN112198356A (en) * | 2020-10-08 | 2021-01-08 | 北京豪锐达科技有限公司 | Current signal detection sensor of high-voltage overhead line |
| CN113804946A (en) * | 2021-09-27 | 2021-12-17 | 杨帆 | Equipotential parasitic power supply voltage and current transformer combination device and working method thereof |
| CN114264856A (en) * | 2021-11-16 | 2022-04-01 | 国网山西省电力公司忻州供电公司 | Voltage measurement and energy taking device capable of measuring small current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103926514A (en) * | 2014-04-28 | 2014-07-16 | 成都高斯电子技术有限公司 | Insulation diagnostic method for high-voltage equipment in charged operating state |
| CN204116591U (en) * | 2014-11-14 | 2015-01-21 | 国家电网公司 | Voltage transformer (VT) calibrates for error online and uses normal voltage proportioning device |
| CN105004943A (en) * | 2015-06-04 | 2015-10-28 | 北京智罗盘智能电气有限公司 | Electric energy quality monitoring and electric energy metering device that can be mounted and dismounted in an electrified manner at a high-tension side |
| CN205229278U (en) * | 2015-12-01 | 2016-05-11 | 国网河南省电力公司平顶山供电公司 | PT, CT composite set that can install with electricity |
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2015
- 2015-12-01 CN CN201510867888.3A patent/CN105334375A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926514A (en) * | 2014-04-28 | 2014-07-16 | 成都高斯电子技术有限公司 | Insulation diagnostic method for high-voltage equipment in charged operating state |
| CN204116591U (en) * | 2014-11-14 | 2015-01-21 | 国家电网公司 | Voltage transformer (VT) calibrates for error online and uses normal voltage proportioning device |
| CN105004943A (en) * | 2015-06-04 | 2015-10-28 | 北京智罗盘智能电气有限公司 | Electric energy quality monitoring and electric energy metering device that can be mounted and dismounted in an electrified manner at a high-tension side |
| CN205229278U (en) * | 2015-12-01 | 2016-05-11 | 国网河南省电力公司平顶山供电公司 | PT, CT composite set that can install with electricity |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953410A (en) * | 2017-04-27 | 2017-07-14 | 国网福建省电力有限公司 | A kind of low-voltage power network monitoring terminal and monitoring system |
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | composite current frequency sensor |
| CN112198356A (en) * | 2020-10-08 | 2021-01-08 | 北京豪锐达科技有限公司 | Current signal detection sensor of high-voltage overhead line |
| CN113804946A (en) * | 2021-09-27 | 2021-12-17 | 杨帆 | Equipotential parasitic power supply voltage and current transformer combination device and working method thereof |
| CN114264856A (en) * | 2021-11-16 | 2022-04-01 | 国网山西省电力公司忻州供电公司 | Voltage measurement and energy taking device capable of measuring small current |
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