CN202025636U - Electronic current transformer based on low-energy-consumption iron-core coil LPCTs - Google Patents
Electronic current transformer based on low-energy-consumption iron-core coil LPCTs Download PDFInfo
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- CN202025636U CN202025636U CN2010206515672U CN201020651567U CN202025636U CN 202025636 U CN202025636 U CN 202025636U CN 2010206515672 U CN2010206515672 U CN 2010206515672U CN 201020651567 U CN201020651567 U CN 201020651567U CN 202025636 U CN202025636 U CN 202025636U
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Abstract
The utility model discloses an electronic current transformer based on low-energy-consumption iron-core coil LPCTs. The electronic current transformer comprises a low-energy-consumption iron-core coil. A primary winding N1 of the low-energy-consumption iron-core coil is connected with a primary line, and a secondary winding N2 of the low-energy-consumption iron-core coil is serially connected with a sampling resistor Rsh. Each of two ends of the sampling resistor Rsh is in parallel connection with a collector. The collector is provided with an optical synchronous input interface and an optical data output interface. The electronic current transformer of the utility model enhances safety, reliability, precision, sensitivity and response speed of electric power systems, satisfies the transient protection requirement, simplifies the wiring of secondary devices of electric power systems, and significantly promotes the fiber-based digital intellectual development of transformer substations. The electronic current transformer based on low-energy-consumption iron-core coil LPCTs has excellent performance and can be widely applied in the electric power field.
Description
Technical field
The utility model relates to a kind of current transformer, particularly a kind of electronic current mutual inductor based on low-power consumption iron-core coil LPCT.
Background technology
Instrument transformer is the eyes of electric power system, and voltage by the instrument transformer detection line or electric current are also realized isolation with primary equipment, cooperates functions such as the metering that realizes electric power system, protection, observing and controlling simultaneously with secondary device; Traditional electromagnetic current transducer similar transformer, line conductor is done winding one time, the secondary coil of electromagnetic transfer being given short-circuit condition by silicon sheet core, the electric current that electric current that the secondary coil induction produces and primary winding produce is cancelled out each other in silicon sheet core, I1*N1=I2*N2, thus in secondary coil, induce the secondary current that is proportional to line current.
Traditional electromagnetic current transducer is transmitting medium with the silicon sheet core, except that the secondary current that induction produces with primary current is directly proportional, the effect of also bearing insulation, drive load, signal conducting, the type instrument transformer exists iron loss big, ferromagnetic saturated and resonance, insulation system complexity, precision to be subjected to problems such as load effect, open circuit high pressure, earth fault, electromagnetic interference, can not satisfy modern power systems primary system voltage height, capacity is big and the requirement of electrical secondary system microcomputerization, miniaturization, networking.
The utility model content
In order to solve above-mentioned technical problem, the purpose of this utility model provides a kind of, volume little, iron loss little and precision high electronic current mutual inductor based on low-power consumption iron-core coil LPCT few with material.
The technical scheme that its technical problem that solves the utility model adopts is:
Electronic current mutual inductor based on low-power consumption iron-core coil LPCT, comprise the low-power consumption iron-core coil, the elementary winding N1 of described low-power consumption iron-core coil is connected with primary line, the secondary winding N2 of described low-power consumption iron-core coil is connected in series with a sampling resistor Rsh, the two ends of described sampling resistor Rsh are connected in parallel to a collector, are respectively equipped with phototiming input interface and light data output interface on the described collector.
Be further used as preferred embodiment, described low-power consumption iron-core coil is sloping film alloy material.
Be further used as preferred embodiment, described collector includes input buffering module and CPU module, described input buffering module is connected with signal processing module, A/D module and electrooptic conversion module in turn, the input of described electrooptic conversion module is connected with the output of CPU module, output is provided with the light data output interface, the output of described CPU module is connected with the input of A/D module, input is connected with photoelectric conversion module, and the input of described photoelectric conversion module is provided with the phototiming input interface.
The beneficial effects of the utility model are: the utility model has improved security reliability, precision, sensitivity and the response speed of electric power system; satisfy the transient protection requirement; simplified the wiring of secondary equipment in power system, promoted transformer station greatly to digitlization, fiberize and intelligent direction development.
The utility model low-power consumption iron core current transformer adopts the big material of excitation impedance to do iron core, and driving load simultaneously is a fixing little sampling resistor, thus have few with material, volume is little, iron loss is little, the precision advantages of higher.Carry out AD sampling and the digital light current signal is transmitted by optical fiber in electric light conversion back by local acquisition module and since optical fiber have good insulating, antijamming capability by force, characteristics such as no earth fault, improved the performance of instrument transformer greatly, safe and convenient to use.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit block diagram of collector of the present utility model.
Embodiment
With reference to Fig. 1, electronic current mutual inductor based on low-power consumption iron-core coil LPCT, comprise the low-power consumption iron-core coil, the elementary winding N1 of described low-power consumption iron-core coil is connected with primary line, the secondary winding N2 of described low-power consumption iron-core coil is connected in series with a sampling resistor Rsh, the two ends of described sampling resistor Rsh are connected in parallel to a collector 3, are respectively equipped with phototiming input interface 1 and light data output interface 2 on the described collector 3.
Be further used as preferred embodiment, described low-power consumption iron-core coil is sloping film alloy material.
With further reference to Fig. 2, as preferred embodiment, described collector 3 includes input buffering module and CPU module, described input buffering module is connected with signal processing module, A/D module and electrooptic conversion module in turn, the input of described electrooptic conversion module is connected with the output of CPU module, output is provided with the light data output interface, the output of described CPU module is connected with the input of A/D module, input is connected with photoelectric conversion module, and the input of described photoelectric conversion module is provided with the phototiming input interface.
Low-power ironcore choke current sensor (LPCT) is the development of conventional induction type current instrument transformer.LPCT is an induction type current instrument transformer that comprises winding, little iron core and a secondary winding; Core material adopts the high nanocrystalline magnetic material of excitation impedance to make, and loss is little, the precision height; Secondary winding connects a sampling resistor Rsh.Secondary current is converted to voltage; This locality is provided with digital collection and the fiberize teletransmission that collector is realized signal.
The high pressure collector receives voltage sensor and current sensor senses signal, through after filtering, amplification, the phase compensation, A/D conversion, electric light conversion process, finally send to low-pressure side and merge device with the serial optical signal form;
The following characteristics of high-pressure side circuit tool:
Synchronized sampling: the synchronized sampling order that reception merging device sends over is also carried out signal sampling, realizes whole station synchronous acquisition.
Supply power mode: support laser powered sensor, the online power taking of little CT, powered battery simultaneously; In light when power supply, merge the light energy that device sends by photovoltaic cell with low-pressure side and can be converted to+output of 5V DC power supply, and regulate the low-pressure side laser output power automatically according to high-pressure side power source voltage level, guarantees the long-term stability of light power supply.Its power is at least 120mW.
16 A/D converters: high accuracy, high sampling rate, low-power consumption.
Low power dissipation design: the highest power consumption of high pressure collector is less than 40mW.
More than be that preferable enforcement of the present utility model is specified, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of the utility model spirit, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (3)
1. based on the electronic current mutual inductor of low-power consumption iron-core coil LPCT, it is characterized in that: comprise the low-power consumption iron-core coil, the elementary winding (N1) of described low-power consumption iron-core coil is connected with primary line, the secondary winding of described low-power consumption iron-core coil (N2) is connected in series with a sampling resistor (Rsh), the two ends of described sampling resistor (Rsh) are connected in parallel to a collector (3), are respectively equipped with phototiming input interface (1) and light data output interface (2) on the described collector (3).
2. the electronic current mutual inductor based on low-power consumption iron-core coil LPCT according to claim 1 is characterized in that: described low-power consumption iron-core coil is sloping film alloy material.
3. the electronic current mutual inductor based on low-power consumption iron-core coil LPCT according to claim 1, it is characterized in that: described collector (3) includes input buffering module and CPU module, described input buffering module is connected with signal processing module in turn, A/D module and electrooptic conversion module, the input of described electrooptic conversion module is connected with the output of CPU module, output is provided with the light data output interface, the output of described CPU module is connected with the input of A/D module, input is connected with photoelectric conversion module, and the input of described photoelectric conversion module is provided with the phototiming input interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206515672U CN202025636U (en) | 2010-12-09 | 2010-12-09 | Electronic current transformer based on low-energy-consumption iron-core coil LPCTs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206515672U CN202025636U (en) | 2010-12-09 | 2010-12-09 | Electronic current transformer based on low-energy-consumption iron-core coil LPCTs |
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| CN202025636U true CN202025636U (en) | 2011-11-02 |
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| CN2010206515672U Expired - Fee Related CN202025636U (en) | 2010-12-09 | 2010-12-09 | Electronic current transformer based on low-energy-consumption iron-core coil LPCTs |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065014A (en) * | 2012-12-29 | 2013-04-24 | 广东电网公司电力科学研究院 | Iron-core coil low-power current transformer model in electric power system and modeling method of iron-core coil low-power current transformer model |
| CN103149413A (en) * | 2013-03-05 | 2013-06-12 | 昆明理工大学 | Piezoelectric actuation type optical fiber Bragg grating current sensor based on LPCT (low-power current transducer) and use method thereof |
| CN103675433A (en) * | 2013-12-12 | 2014-03-26 | 国家电网公司 | Current sampling and protecting circuit for electronic current transformer |
| CN103901246A (en) * | 2014-03-25 | 2014-07-02 | 国家电网公司 | Electronic transformer device |
-
2010
- 2010-12-09 CN CN2010206515672U patent/CN202025636U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065014A (en) * | 2012-12-29 | 2013-04-24 | 广东电网公司电力科学研究院 | Iron-core coil low-power current transformer model in electric power system and modeling method of iron-core coil low-power current transformer model |
| CN103065014B (en) * | 2012-12-29 | 2015-10-28 | 广东电网公司电力科学研究院 | Iron-core coil low-power current transformer model and modeling method thereof in electric system |
| CN103149413A (en) * | 2013-03-05 | 2013-06-12 | 昆明理工大学 | Piezoelectric actuation type optical fiber Bragg grating current sensor based on LPCT (low-power current transducer) and use method thereof |
| CN103675433A (en) * | 2013-12-12 | 2014-03-26 | 国家电网公司 | Current sampling and protecting circuit for electronic current transformer |
| CN103901246A (en) * | 2014-03-25 | 2014-07-02 | 国家电网公司 | Electronic transformer device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG ZHONGYU TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ZHONGYU SCIENCE + TECHNOLOGY CO., LTD., GUANGDONG |
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| CP01 | Change in the name or title of a patent holder |
Address after: 511495 Guangdong city of Guangzhou province Panyu District zhongcunzhen Pingshan Village Office Building No. 2 Patentee after: GUANGDONG ZHONGYU TECHNOLOGY CO., LTD. Address before: 511495 Guangdong city of Guangzhou province Panyu District zhongcunzhen Pingshan Village Office Building No. 2 Patentee before: Zhongyu Science & Technology Co., Ltd., Guangdong |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20171209 |