CN202134396U - Electronic transformer - Google Patents
Electronic transformer Download PDFInfo
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- CN202134396U CN202134396U CN201120256461U CN201120256461U CN202134396U CN 202134396 U CN202134396 U CN 202134396U CN 201120256461 U CN201120256461 U CN 201120256461U CN 201120256461 U CN201120256461 U CN 201120256461U CN 202134396 U CN202134396 U CN 202134396U
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- mutual inductor
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Abstract
The utility model discloses an electronic transformer. The electronic transformer comprises a Rogowski coil in coupled connection with a main loop, a high-voltage side circuit in electric connection with the Rogowski coil, a low-voltage side circuit in signal connection with the high-voltage side circuit, and a power supply circuit supplying power for both the high-voltage side circuit and the low-voltage side circuit, wherein the high-voltage side circuit comprises an integrating circuit, an A/D (Audio/Digital) conversion circuit and a main-control CPU (Central Processing Unit) which are in sequential connection; the input terminal of the integrating circuit is connected with the Rogowski coil; and the main-control CPU is in signal connection with the low-voltage side circuit. Further, the power supply circuit comprises another Rogowski coil, an attenuation module, a rectification circuit, a filter circuit and a voltage stabilizing circuit which are in sequential connection, wherein the Rogowski coil is in coupled connection with the main loop; and the voltage stabilizing circuit is connected with the high-voltage side circuit and the low-voltage side circuit respectively for electric energy supply. Compared with a traditional electromagnetic transformer, the electronic transformer provided by the utility model has the advantages of wide dynamic range, high measuring accuracy, wide frequency response range, simple structure, good safety and reliability, and the like.
Description
Technical field
The utility model relates to a kind of instrument transformer, relates in particular to a kind of electronic mutual inductor based on Luo Shi (Rogowski) coil.
Background technology
Instrument transformer is the equipment of scaling transformation voltage or electric current.Instrument transformer is standard low-voltage (100V) or standard low current (5A or 1A) with the high voltage or the big current transformation of input, so as to realize measuring, equipment protection, and function such as automation control.Instrument transformer also can be used for separating high-voltage system, to protect the person and device security.Because the electric current and voltage of electric power system differs greatly (electric current can be pacified to several Wan An from several); Therefore, also relatively very high to the requirement of instrument transformer, need instrument transformer to stand the big voltage of big electric current; Need instrument transformer to have excellent measurement accuracy; Also need instrument transformer as safe as a house, can make accurately abnormal conditions and measure, judge, and provide accurately the information system that makes to realize protection and early warning.The instrument transformer that has occurred at present mainly contains three types: electromagnetic type, electronic type, photoelectric type.
Through the iron core coupling, insulation system is complicated between the measured signal of electromagnetic transformer and the secondary coil, and its cost is exponential relationship with electric pressure and rises.There are problems such as magnetic saturation and ferro resonance in electromagnetic transformer inevitably owing to used iron core.The electromagnetic current transducer secondary circuit can not be opened a way, and low-pressure side exists open circuit dangerous.The electric current that current transformer flow through when electrical network normally moved is little, but short circuit current is generally very big, and along with the increase of net capacity, short circuit current is increasing.Electromagnetic current transducer is difficult to realize large-range measuring because of there being the magnetic saturation problem, and same instrument transformer is difficult to satisfy simultaneously the needs of measurement and relaying protection.What electromagnetic transformer transmitted is analog signal, and the measurement in the power station, control and relaying protection all are to be transferred to the control room through the signal of telecommunication that coaxial cable is measured electric sensor traditionally.When a plurality of different devices need the signal of same instrument transformer, just need carry out complicated secondary connection, this traditional structure can receive the interference of electromagnetic field inevitably.
Electronic mutual inductor and photoelectric type instrument transformer belong to more novel instrument transformer; On principle, be essentially different with traditional instrument transformer; Generally do the magnetic coupling without iron core; Therefore eliminate magnetic saturation and ferro resonance phenomenon, thereby made good, the good stability of instrument transformer operation transient response, guaranteed the high reliability of system's operation.Its insulation system is simplified greatly, and high more its superiority of effectiveness of electric pressure is obvious more.Photoelectric type instrument transformer wherein with optical cable rather than cable as the signal delivery means; Realized the thorough isolation of high-low pressure; The harm that does not exist short circuit of voltage transformer secondary loop or secondary loop of mutual inductor to open a way and cause to the equipment and the person, fail safe and reliability improve greatly.
The utility model content
The utility model technical problem to be solved is to overcome the existing deficiency of traditional electromagnetic transformer; A kind of electronic mutual inductor based on Luo-coil is provided; This instrument transformer has good transient response property and stability, and simple in structure, and certainty of measurement is high.
The electronic mutual inductor of the utility model comprises: the Luo-coil that is of coupled connections with major loop; The high-pressure side circuit that is electrically connected with Luo-coil; The lower-voltage circuit that is connected with the high-pressure side circuit signal, and be the power supply circuits that high-pressure side circuit and lower-voltage circuit provide power supply; Said high-pressure side circuit comprises integrating circuit, A/D change-over circuit and the master cpu that connects in order; The input of integrating circuit is connected with said Luo-coil; Master cpu is connected with said lower-voltage circuit signal.
Preferably, said lower-voltage circuit comprises FPGA circuit, DSP circuit, built-in network module and the digital output that connects in order; The FPGA circuit is connected with said master cpu signal.
Preferably, said power supply circuits comprise Luo-coil, attenuation module, rectification circuit, filter circuit, the voltage stabilizing circuit that connects in order; Said Luo-coil and said major loop are of coupled connections; Voltage stabilizing circuit is connected with said high-pressure side circuit, lower-voltage circuit respectively, and its required electric energy is provided.
Further, said power supply circuits also comprise the storage battery that is connected with said voltage stabilizing circuit, thereby can unnecessary electric energy be got up through accumulators store.
Further, said power supply circuits also comprise non-linear feedback circuit, and its input is connected with the output of said filter circuit, and output is connected with the control end of said attenuator circuit.Signal magnitude according to filter circuit output is controlled attenuation module automatically, and the multiplying power that makes it to decay is suitable.
Compare traditional electromagnetic transformer, the electronic mutual inductor of the utility model has the following advantages:
Dynamic range is big, and certainty of measurement is high, and frequency response range is wide, can satisfy the needs of measurement and relaying protection simultaneously;
Can measure the harmonic wave on the high-voltage power line, so that carry out the measurement of power network current transient state, the big electric current of high frequency and direct current; The transfer of data antijamming capability is strong, can carry out data communication easily, can instrument transformer and the device that need take transducer signal be constituted a fieldbus networks, thereby realize data sharing; Because its intrinsic anti-electromagnetic interference performance has demonstrated impayable superiority especially in abominable power station environment; Simultaneously, carry out the signal transmission with cable, simple, economical.
Description of drawings
Fig. 1 is the electronic mutual inductor structure and the principle schematic of the utility model;
Fig. 2 is the principle schematic of Luo-coil.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to the utility model:
The electronic mutual inductor of the utility model, as shown in Figure 1, comprise Rogowski coil, high-pressure side circuit, lower-voltage circuit and power supply circuits four parts; Major loop to be measured passes Luo-coil; The high-pressure side circuit comprises integrating circuit, A/D change-over circuit and the master cpu that connects in order, and the input of integrating circuit is connected with said Luo-coil; Lower-voltage circuit comprises FPGA circuit, DSP circuit, built-in network module and the digital output that connects in order, and the FPGA circuit is connected through cable signal with master cpu; Power supply circuits comprise Luo-coil, attenuation module, rectification circuit, filter circuit, the voltage stabilizing circuit that connects in order; Luo-coil and said major loop are of coupled connections; Voltage stabilizing circuit is connected with said high-pressure side circuit, lower-voltage circuit respectively, and its required electric energy is provided; Power supply circuits also comprise the storage battery that is connected with voltage stabilizing circuit, and non-linear feedback circuit.The input of non-linear feedback circuit is connected with the output of said filter circuit, and output is connected with the control end of said attenuator circuit.
Luo-coil is a sensing unit the most frequently used in the current transformer.It is that lead is evenly close on the non magnetic skeleton of annular uiform section and the air-core inductance that forms, and as shown in Figure 2, its output voltage e is proportional to tested change in current rate, as shown in the formula
M is the mutual inductance of coil in the formula; I is tested electric current.
Integrating circuit can restore tested current signal through the integration to Luo-coil output voltage e (t), and its principle is shown below:
The A/D change-over circuit can carry out mould/number conversion to current signal, becomes digital signal.The A/D chip has adopted the successive approximation high-speed a/d with 16 conversion accuracies, and the sample conversion value of successive approximation A/D is an instantaneous value.
The high-pressure side circuit receives the synchronized sampling order that low-pressure side FPGA circuit sends through master cpu, starts the A/D conversion then, and utilizes cable communication system to be sent to the FPGA circuit in the lower-voltage circuit conversion value of reading through serial communication port.
The FPGA circuit produces through the crystal oscillator clock division to the high precision high stability degree and satisfies the synchronized sampling order that sample rate requires, and should order and send to master cpu, and receive the digital signal that master cpu is come from the cable biography.
The digital signal that the DSP circuit is brought the FPGA circuit is handled, and is cooperatively interacted by DSP and FPGA, accomplishes synchronously, receives and handle functions such as multi channel signals and communication jointly.
The built-in network module realizes the conversion of serial data to Ethernet data, and signal is exported through the standard digital delivery outlet the most at last.
The utility model does not adopt the mode of external power source, but utilizes the power supply circuits shown in Fig. 1 from measured major loop, to extract electric energy.Attenuation module passes the advanced line amplitude decay of the ac voltage signal of coming with the Rogowski coil; Utilize the unilateral conduction of diode then by rectification circuit; Become unidirectional Rectified alternating current to the alternating current of positive and negative alternation; Waveform is become smoothly through filter circuit again, and then pass through the effect of voltage stabilizing circuit, obtain at last that waveform is straight, the voltage galvanic current.Give system's each several part circuit supply, also can unnecessary electric energy be got up through accumulators store simultaneously.Non-linear feedback circuit is controlled attenuation module according to the signal magnitude of filter output automatically, and the multiplying power that makes it to decay is suitable.
For shield electromagnetic interference, in the electronic mutual inductor integral installation of the utility model and the shielding casing, thereby effectively shielded electromagnetic interference, improve the security reliability of whole system.
The utility model has widely and uses in fields such as 35KV transmission line, 10KV distribution lines, is a kind of economy, reliable electronic mutual inductor.Because the superior performance that it had; The needs that adapted to electric power digitalization, intellectuality and web development; And have tangible economic benefit and social benefit, have profound significance for guaranteeing huge and complicated day by day power system security reliability service and improving its automaticity.
Claims (8)
1. electronic mutual inductor; Comprise: the Luo-coil that is of coupled connections with major loop; The high-pressure side circuit that is electrically connected with Luo-coil, the lower-voltage circuit that is connected with the high-pressure side circuit signal, and be the power supply circuits that high-pressure side circuit and lower-voltage circuit provide power supply; It is characterized in that said high-pressure side circuit comprises integrating circuit, A/D change-over circuit and the master cpu that connects in order; The input of integrating circuit is connected with said Luo-coil; Master cpu is connected with said lower-voltage circuit signal.
2. electronic mutual inductor according to claim 1 is characterized in that, said lower-voltage circuit comprises FPGA circuit, DSP circuit, built-in network module and the digital output that connects in order; The FPGA circuit is connected with said master cpu signal.
3. electronic mutual inductor according to claim 1 is characterized in that, said power supply circuits comprise Luo-coil, attenuation module, rectification circuit, filter circuit, the voltage stabilizing circuit that connects in order; Said Luo-coil and said major loop are of coupled connections; Voltage stabilizing circuit is connected with said high-pressure side circuit, lower-voltage circuit respectively, and its required electric energy is provided.
4. like the said electronic mutual inductor of claim 3, it is characterized in that said power supply circuits also comprise the storage battery that is connected with said voltage stabilizing circuit.
5. like the said electronic mutual inductor of claim 3, it is characterized in that said power supply circuits also comprise non-linear feedback circuit, its input is connected with the output of said filter circuit, and output is connected with the control end of said attenuator circuit.
6. electronic mutual inductor according to claim 1 is characterized in that master cpu is connected through cable signal with lower-voltage circuit.
7. electronic mutual inductor according to claim 1 is characterized in that said electronic mutual inductor integral installation is in a shielding casing.
8. electronic mutual inductor according to claim 1 is characterized in that said A/D change-over circuit comprises successive approximation high-speed a/d conversion chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120256461U CN202134396U (en) | 2011-07-20 | 2011-07-20 | Electronic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120256461U CN202134396U (en) | 2011-07-20 | 2011-07-20 | Electronic transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202134396U true CN202134396U (en) | 2012-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120256461U Expired - Fee Related CN202134396U (en) | 2011-07-20 | 2011-07-20 | Electronic transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202134396U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067860A (en) * | 2015-07-22 | 2015-11-18 | 许继集团有限公司 | Electronic mutual inductor |
| CN110619175A (en) * | 2019-09-17 | 2019-12-27 | 贵州电网有限责任公司 | Dynamic attenuation integral reduction method for acquisition unit of electronic transformer |
| 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 |
| CN114252674A (en) * | 2021-12-15 | 2022-03-29 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
-
2011
- 2011-07-20 CN CN201120256461U patent/CN202134396U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067860A (en) * | 2015-07-22 | 2015-11-18 | 许继集团有限公司 | Electronic mutual inductor |
| CN110619175A (en) * | 2019-09-17 | 2019-12-27 | 贵州电网有限责任公司 | Dynamic attenuation integral reduction method for acquisition unit of electronic transformer |
| 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 |
| CN114252674A (en) * | 2021-12-15 | 2022-03-29 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
| CN114252674B (en) * | 2021-12-15 | 2023-09-22 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
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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: 20120201 Termination date: 20120720 |