CN110068718B - Electronic transformer with resistance voltage division function - Google Patents
Electronic transformer with resistance voltage division function Download PDFInfo
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- CN110068718B CN110068718B CN201910464085.1A CN201910464085A CN110068718B CN 110068718 B CN110068718 B CN 110068718B CN 201910464085 A CN201910464085 A CN 201910464085A CN 110068718 B CN110068718 B CN 110068718B
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- connecting terminal
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- copper connecting
- resistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
Abstract
The invention provides an electronic transformer with resistance voltage division, which comprises: signal receiving and processing device, little resistance core, first copper connecting terminal, second copper connecting terminal, metal foil, epoxy layer and insulating casing. Insulating casing is equipped with first copper connecting terminal with second copper connecting terminal, epoxy layer is encapsulating the little resistance core, the one end of little resistance core with first copper connecting terminal welding, the other end of little resistance core with second copper connecting terminal welding. First copper connecting terminal with all the welding has metal foil on the surface of second copper connecting terminal, signal reception and processing apparatus with the metal foil electricity is connected, signal reception and processing apparatus passes through metal foil gathers the both ends voltage of little resistance core, and right the both ends voltage carries out output measuring signal after signal processing. The invention can improve the safety and the metering accuracy of the power supply system.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an electronic transformer with resistance voltage division.
Background
With the development of power systems, smart grids with information, automation and interaction as important features are generally accepted. In the smart power grids construction, it is the development direction of technique to replace traditional mutual-inductor with the more superior electronic transformer of performance, and wherein electronic current transformer's realization includes: the magnetic resonance type optical fiber shunt comprises a Rogowski coil/hollow coil implementation mode based on an electromagnetic induction principle, an all-fiber implementation mode based on a Faraday magneto-optical effect induction principle and a shunt implementation mode based on a resistance voltage division principle.
When the electronic current transformer is designed and manufactured based on the shunt principle to measure large current, in order to avoid the situation that the large current flows through a shunt resistor to generate high heat, a micro resistor with high precision and micro ohm level is required to be selected, a sampling signal which is as small as micro volt level is effectively led out from the micro resistor with the micro ohm level, the fidelity transmission of the signal is realized, and the situation that the shunt performance is not led into an obvious discrete type due to leading and transmission in batch production is ensured, so that the electronic current transformer is a difficult problem.
Disclosure of Invention
The invention provides a resistance voltage-dividing electronic transformer, which solves the problems that a voltage acquisition connecting wire of a high-voltage resistor in the conventional electronic transformer is easy to burn out and the precision of a voltage acquisition signal is low, and can improve the safety and the metering accuracy of a power supply system.
In order to achieve the above purpose, the invention provides the following technical scheme:
a resistance-divided electronic transformer comprising: the device comprises a signal receiving and processing device, a micro-resistor core, a first copper connecting terminal, a second copper connecting terminal, a metal foil, an epoxy layer, a flexible transmission line belt and an insulating shell;
the first copper connecting terminal and the second copper connecting terminal are arranged in the insulating shell, the micro-resistor core is encapsulated by the epoxy layer, one end of the micro-resistor core is welded with the first copper connecting terminal, and the other end of the micro-resistor core is welded with the second copper connecting terminal;
a plurality of metal foils are welded on the surfaces of the welding sides of the first copper connecting terminal, the second copper connecting terminal and the micro resistor core, and the metal foils are opposite to each other in position and are uniformly distributed on the first copper connecting terminal and the second copper connecting terminal;
the tail end of the flexible transmission line belt is provided with a printed circuit board slot, the tail ends of a plurality of branches at two sides of the flexible transmission line belt are assembled with each metal foil into a whole, each metal foil is connected with a corresponding terminal of the printed circuit board slot through an independent wire in the flexible transmission line belt, the printed circuit board slot is connected with a signal receiving and processing board card, the signal receiving and processing board card is connected with a signal receiving and processing device, the signal receiving and processing device collects voltages at two ends of the micro-resistor core through the signal receiving and processing board card, the printed circuit board slot and the flexible transmission line belt, processes the voltages at the two ends and outputs a measurement signal.
Preferably, the metal foil sheets are 4-64 sheets and are symmetrically arranged on the outer surfaces of the first copper connecting terminal and the second copper connecting terminal on the welding side of the micro resistance core.
Preferably, the signal receiving and processing device is provided with 3 signal acquisition channels, converts the received voltages at two ends of the micro-resistor core into three digital signals including a measuring current, a protection current 1 and a protection current 2, and transmits the three digital signals to the post-stage measurement control device through optical fibers.
Preferably, the insulating shell material is epoxy resin.
Preferably, the flexible transmission line belt is made of high-temperature-resistant materials, can resist the high temperature of over 155 ℃ and can resist the voltage of 1000 VAC.
Preferably, the resistance value range of the micro-resistance core is 1-100 micro ohms.
According to the invention, the metal foils with high conductivity are symmetrically welded on the two sides of the micro-resistor core, so that the signal receiving and processing device collects the voltages at the two ends of the micro-resistor core through the metal foils, and can realize balance and compensation effects on the slightly uneven characteristic of the internal resistance value of the micro-resistor core, thereby improving the consistency of product performance during batch production, solving the problems that a voltage collecting connecting wire of a high-voltage resistor in the existing electronic transformer is easy to burn out and the precision of a voltage collecting signal is low, and improving the safety and metering accuracy of a power supply system.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIG. 1: the invention provides a structural schematic diagram of an electronic transformer with resistance voltage division;
FIG. 2: the invention provides a structure diagram of an electronic transformer.
Reference numerals
1 first copper connection terminal
2 second copper connection terminal
3 micro-resistor core
4 Metal foil
5 Signal receiving and processing device
6 flexible transmission line belt
7 insulating housing
8 epoxy layer
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
The problem that voltage acquisition signals are inaccurate due to the fact that a voltage acquisition line of an electronic transformer with current resistor voltage division is easy to burn out is solved. The invention provides a resistance voltage-dividing electronic transformer, which is characterized in that high-conductivity metal foils are symmetrically welded on two sides of a micro-resistor core, so that a signal receiving and processing device collects voltages at two ends of the micro-resistor core through the metal foils, the problems that a voltage collecting connecting wire of a high-voltage resistor in the conventional electronic transformer is easy to burn out and the precision of a voltage collecting signal is low are solved, and the safety and the metering accuracy of a power supply system can be improved.
As shown in fig. 1 and 2, an electronic transformer with a voltage-dividing resistor includes: the device comprises a signal receiving and processing device 5, a micro-resistor core 3, a first copper connecting terminal 1, a second copper connecting terminal 2, a metal foil 4, an epoxy layer 8, a flexible transmission line belt 6 and an insulating shell 7;
the first copper connecting terminal 1 and the second copper connecting terminal 2 are arranged in the insulating shell 7, the micro-resistor core 3 is encapsulated by the epoxy layer 8, one end of the micro-resistor core 3 is welded with the first copper connecting terminal 1, and the other end of the micro-resistor core 3 is welded with the second copper connecting terminal 2;
a plurality of metal foils 4 are welded on the surfaces of the welding sides of the first copper connecting terminal 1, the second copper connecting terminal 2 and the micro resistor core 3, and the metal foils 4 are opposite to each other in position and are uniformly distributed on the first copper connecting terminal 1 and the second copper connecting terminal 2;
the tail end of the flexible transmission line belt 6 is provided with a printed circuit board slot, the tail ends of a plurality of branches at two sides of the flexible transmission line belt 6 and each metal foil 4 are assembled into a whole, each metal foil 4 is connected with a corresponding terminal of the printed circuit board slot through an independent lead in the flexible transmission line belt 6, the printed circuit board slot is connected with a signal receiving and processing board card, the signal receiving and processing board card is connected with a signal receiving and processing device 5, the signal receiving and processing device 5 collects the voltages at two ends of the micro-resistor core 3 through the signal receiving and processing board card, the printed circuit board slot and the flexible transmission line belt 6, and outputs a measurement signal after the voltages at the two ends are subjected to signal processing.
In this embodiment, the metal foil 4 has 4 to 64 pieces, and is symmetrically disposed on the outer surfaces of the first copper connecting terminal 1 and the second copper connecting terminal 2 on the side welded to the micro resistor core.
In this embodiment, the signal receiving and processing device 5 has 3 signal acquisition channels, converts the voltage at two ends of the received micro-resistor core into three digital signals, namely a measurement current, a protection current 1 and a protection current 2, and transmits the three digital signals to the post-stage measurement control device through an optical fiber.
In this embodiment, the insulating housing 7 is made of epoxy resin.
In this embodiment, the flexible transmission line belt 6 is made of a high temperature resistant material, can resist a high temperature of more than 155 ℃ and can resist a voltage of 1000VAC, and thus, the signal leading and transmitting loop can stably work in a high temperature environment.
In this embodiment, the resistance value range of the micro-resistor core 3 is 1 to 100 microohm.
The invention leads out the electric signal on the micro-resistor core through a plurality of pairs of metal foils, can realize the balance and compensation effect on the slightly uneven characteristic of the internal resistance value of the micro-resistor core, and thus improves the consistency of the product performance in batch production.
Secondly, a formed flexible transmission line connection process is adopted in the large-current measuring part for the first time, the process is attractive, the operation is simple and convenient, and the reliability and the consistency of product connection can be effectively improved.
And thirdly, all the parts and the connection thereof are completed automatically and semi-automatically, and later-stage manual screwing and other assembly operations are not needed, so that adverse effects on leading signals caused by resistivity differences of manual operation interfaces are avoided, and the high-fidelity high-consistency leading and transmission of micro electric signals by the product is ensured.
Finally, through the printed circuit board slot, the electronic current transformer can be quickly plugged and unplugged with a connector on the signal receiving and processing device so as to quickly connect and acquire sampling signals, and the characteristic improves the product debugging and production efficiency of the electronic current transformer.
In conclusion, the high-conductivity metal foils are symmetrically welded on the two sides of the micro-resistor core, so that the signal receiving and processing device collects the voltages at the two ends of the micro-resistor core through the metal foils, the balance and compensation effects on the slightly uneven characteristic of the internal resistance value of the micro-resistor core can be realized, the consistency of product performance during batch production is improved, the problems that a voltage collecting connecting wire of a high-voltage resistor in the existing electronic transformer is easy to burn out and the precision of a voltage collecting signal is low are solved, and the safety and the metering accuracy of a power supply system can be improved.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (6)
1. The electronic transformer with the voltage divided by the resistors is characterized by comprising the following components: the device comprises a signal receiving and processing device, a micro-resistor core, a first copper connecting terminal, a second copper connecting terminal, a metal foil, an epoxy layer, a flexible transmission line belt and an insulating shell;
the first copper connecting terminal and the second copper connecting terminal are arranged in the insulating shell, the micro-resistor core is encapsulated by the epoxy layer, one end of the micro-resistor core is welded with the first copper connecting terminal, and the other end of the micro-resistor core is welded with the second copper connecting terminal;
a plurality of metal foils are welded on the surfaces of the welding sides of the first copper connecting terminal, the second copper connecting terminal and the micro resistor core, and the metal foils are opposite to each other in position and are uniformly distributed on the first copper connecting terminal and the second copper connecting terminal;
the tail end of the flexible transmission line belt is provided with a printed circuit board slot, the tail ends of a plurality of branches at two sides of the flexible transmission line belt are assembled with each metal foil into a whole, each metal foil is connected with a corresponding terminal of the printed circuit board slot through an independent wire in the flexible transmission line belt, the printed circuit board slot is connected with a signal receiving and processing board card, the signal receiving and processing board card is connected with a signal receiving and processing device, the signal receiving and processing device collects voltages at two ends of the micro-resistor core through the signal receiving and processing board card, the printed circuit board slot and the flexible transmission line belt, processes the voltages at the two ends and outputs a measurement signal.
2. The electronic transformer for resistive voltage division according to claim 1, wherein the metal foils are symmetrically arranged on the outer surfaces of the first copper connection terminal and the second copper connection terminal on the side welded to the micro resistor core in 4 to 64 pieces, respectively.
3. The electronic transformer with resistor voltage division according to claim 1, wherein the signal receiving and processing device has 3 signal acquisition channels, converts the voltage at two ends of the micro resistor core into three digital signals including a measurement current, a protection current 1 and a protection current 2, and transmits the three digital signals to the post-stage measurement control device through an optical fiber.
4. The electronic transformer of resistive voltage division according to claim 1, wherein the insulating housing material is epoxy resin.
5. The electronic transformer with resistance voltage division according to claim 1, wherein the flexible transmission line is made of high temperature resistant material, can withstand high temperature of more than 155 ℃ and can withstand 1000VAC voltage.
6. The electronic transformer with resistor voltage division according to claim 1, wherein the micro-resistor core has a resistor resistance value ranging from 1 to 100 micro-ohms.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910464085.1A CN110068718B (en) | 2019-05-30 | 2019-05-30 | Electronic transformer with resistance voltage division function |
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| CN201910464085.1A CN110068718B (en) | 2019-05-30 | 2019-05-30 | Electronic transformer with resistance voltage division function |
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| CN110068718A CN110068718A (en) | 2019-07-30 |
| CN110068718B true CN110068718B (en) | 2022-01-04 |
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| CN201311836Y (en) * | 2008-11-05 | 2009-09-16 | 福建山亚开关有限公司 | Electronic voltage transformer |
| CN201514849U (en) * | 2009-08-26 | 2010-06-23 | 安徽翔远电力科技有限公司 | Composite insulation compensation type electronic voltage transformer |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20211214 Address after: 250101 room 1601, block a, building 1, Jinan pharmaceutical Valley R & D platform area, No.1, north section of Gangxing Third Road, comprehensive bonded zone, Jinan high tech Zone, Shandong Province Applicant after: Shandong United Power Industry Development Co.,Ltd. Address before: 250012 room 1611, block a, building 1, Jinan pharmaceutical Valley R & D platform, No. 1, north section of Gangxing Third Road, comprehensive free trade zone, high tech Zone, Jinan City, Shandong Province Applicant before: SHANDONG LIANHE POWER TECHNOLOGY CO.,LTD. |
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