CN103376438A - Three-phase high-voltage large-current power source - Google Patents
Three-phase high-voltage large-current power source Download PDFInfo
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- CN103376438A CN103376438A CN2013102656720A CN201310265672A CN103376438A CN 103376438 A CN103376438 A CN 103376438A CN 2013102656720 A CN2013102656720 A CN 2013102656720A CN 201310265672 A CN201310265672 A CN 201310265672A CN 103376438 A CN103376438 A CN 103376438A
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Abstract
The invention relates to the field of electrical logging, in particular to a three-phase high-voltage large-current power source. A control system is used for collecting and feeding back a loop output signal, adjusts output of a low-voltage signal source based on the loop output signal and amplifies the loop output signal through a power amplifier and a gas insulating voltage-boosting current-boosting device. The three-phase high-voltage large-current power source can be used for carrying out overall performance detection and metrological verification on a 10kV-35kV high-voltage electric energy meter with a three-phase three-line wiring manner or a three-phase four-line wiring manner.
Description
Technical field
The present invention relates to the electrical measurement field, relate in particular to the large current power of a kind of three-phase high-voltage source.
Background technology
Electric power meter be send out, for the carry on trade measurement instrument of clearing of, electricity consumption three parts, its security, accuracy and reliability are particularly important.Tradition electric power meter (such as proportioning device of high voltage electric energy and high-voltage power metering box), Combined type power equipment, formed by the mutual inductor that is installed in high-voltage fence and the electric energy meter that is installed in mutual inductor low-pressure secondary loop, generally adopt sub-unit calibrating mode to guarantee its electric energy metrical performance.
Electronization and digitizing along with secondary equipment in power system, the integrated instrument of little, the lightweight non-traditional mutual inductor of volume and electronic electric energy meter the electric circuit constitute, namely novel direct access high-voltage electric energy meter comes into operation in 10kV ~ 35kV power circuit gradually gradually.This high-voltage electric energy meter once directly contacts with high voltage, large electric current, secondary output electrical energy impulse signals, and traditional sub-unit calibrating mode is no longer applicable to it, therefore needs development can implement to high-voltage electric energy meter the relevant device of whole detection and measurement verification.
In view of this, the present invention proposes the large current power of a kind of three-phase high-voltage source, this power source can output frequency, amplitude, controlled three-phase high voltage and the large electric current of phase place, satisfy in the existing electric energy meter calibrating apparatus GB of range of adjustment to(for) power supply, regulate the specific requirement of the technical indicators such as fineness, symmetry, waveform distortion, power stability, the overall performance that can be used in the high-voltage electric energy meter of 10kV ~ 35kV phase three-wire three or the three-phase and four-line mode of connection detects and measurement verification.
Summary of the invention
Deficiency for background technology, the present invention gathers the backfeed loop output signal by control system, then control system is according to the output in this Signal Regulation low-voltage signal source, and by power amplifier, gas-insulating type voltage boosting current booster amplifying signal, the overall performance that makes this device can be used for the high-voltage electric energy meter of 10kV ~ 35kV phase three-wire three or the three-phase and four-line mode of connection detects and measurement verification.
The technical solution adopted in the present invention is: the large current power of a kind of three-phase high-voltage source, be linked in sequence and formed closed-loop system by control system, low-voltage signal source, power amplifier, gas-insulating type voltage boosting current booster and backfeed loop, it is characterized in that: described low-voltage signal source comprises three-phase voltage low-voltage signal source and three-phase current low-voltage signal source; Described power amplifier comprises three-phase voltage power amplifier and three-phase current power amplifier, and described control system is regulated the output in low-voltage signal source according to described backfeed loop output signal.
The large current power of aforesaid three-phase high-voltage source is characterized in that: digital synthesis technology and phaselock technique have been adopted in described low-voltage signal source, are comprised of crystal oscillator, programmable counter, phaselocked loop, microcontroller, D/A converter and amplifier.
The large current power of aforesaid three-phase high-voltage source is characterized in that: described control system is divided into voltage, current output value is set, amplitude, frequency, phase measurement, amplitude, frequency, phase adjusted three parts.
The large current power of aforesaid three-phase high-voltage source, it is characterized in that: it is the PSU10 type power amplifier of 2kVA that described three-phase voltage power amplifier is selected output rating, and it is the PSI10 type power amplifier of 2kVA that the three-phase current power amplifier is selected output rating.
The large current power of aforesaid three-phase high-voltage source is characterized in that: described every gas-insulating type voltage boosting current booster, and the specified input voltage of its stepup transformer is 200V, rated output voltage is
KV, rated output capacity 2kVA; The specified input current of current lifting device is 100A, and output-current rating is 1000A rated output capacity 2kVA.
The large current power of aforesaid three-phase high-voltage source, it is characterized in that: current transformer and voltage transformer (VT) in described every gas-insulating type voltage boosting current booster sealed shell of tank convert large electric current high voltage signal to little current signal and low-voltage signal, wherein one the road be connected to backfeed loop, another road is connected to the low-voltage standards electric energy meter.
The invention has the beneficial effects as follows: the large current power of three-phase high-voltage provided by the invention source can output frequency, amplitude, controlled three-phase high voltage and the large electric current of phase place, satisfy in the existing electric energy meter calibrating apparatus GB of range of adjustment to(for) power supply, regulate the specific requirement of the technical indicators such as fineness, symmetry, waveform distortion, power stability, the overall performance that can be used in the high-voltage electric energy meter of 10kV ~ 35kV phase three-wire three or the three-phase and four-line mode of connection detects and measurement verification.
Description of drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the principle schematic in the large current power of embodiment of the invention three-phase high-voltage source;
Fig. 3 is the schematic diagram in low-voltage signal source;
Fig. 4 is the structural drawing of gas-insulating type voltage boosting current booster;
Fig. 5 is the wiring schematic diagram of using this power source calibrating high-voltage electric energy meter.
Embodiment
Description of reference numerals:
1-control system, 2-low-voltage signal source, 3-power amplifier, 4-gas-insulating type voltage boosting current booster, 5-backfeed loop
2UA, 2UB, 2UC are respectively the output in three-phase voltage low-voltage signal source, and 2IA, 2IB, 2IC are respectively the output in three-phase current low-voltage signal source;
Output, 3IA, 3IB, the 3ICC that 3UA, 3UB, 3UC are respectively the three-phase voltage power amplifier is respectively the output of merit three-phase current power amplifier;
4A, 4B, 4C are the output of gas-insulating type voltage boosting current booster;
5A, 5B, 5C are the output of feedback circuit.
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.Those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values are equally within the listed claims limited range of the application.
As shown in Figure 1, the embodiment of the invention provides a kind of rated voltage
The large current power of the three-phase high-voltage of kV, rated current 1000A source is comprised of control system 1, low-voltage signal source 2, power amplifier 3, three same gas insulation voltage boosting current boosters 4 and backfeed loop 5; Low-voltage signal source 2 comprises three-phase voltage low-voltage signal source and three-phase current low-voltage signal source; Power amplifier 3 comprises three-phase voltage power amplifier and three-phase current power amplifier.
Described control system 1 inputs to respectively three-phase voltage and three-phase current low-voltage signal source 2UA, 2IA, 2UB, 2IB, 2UC, 2IC with the setting values such as amplitude, frequency and phase place of voltage and current by data bus, control system 1 receives the signal of backfeed loop 5A, 5B, 5C simultaneously, the difference that compares value of feedback and setting value, and then regulate the output in low-voltage signal source 2, guarantee the accurate stable of power source.
As shown in Figure 3, digital synthesis technology and phaselock technique have been adopted in described low-voltage signal source 2, by crystal oscillator, programmable counter, phaselocked loop, microcontroller, D/A converter and amplifier form, control system 1 is by the frequency preset that writes to realize the phaselocked loop clock signal to programmable counter, discrete sinusoidal wave numeral amount is provided then under the instruction of microcontroller, for the D/A converter AD7521 in the waveform synthesizer, convert digital signal to certain phase relation 0 ~ 5V analog voltage signal by D/A converter and amplifier UA741, input to power amplifier 3.
Described three-phase voltage power amplifier 3UA, 3UB, it is the PSU10 type power amplifier of 2kVA that 3UC selects output rating, three-phase current power amplifier 3IA, 3IB, it is the PSI10 type power amplifier of 2kVA that 3IC selects output rating, 0 ~ 5V modulated-analog signal that low-voltage signal source 2 is provided, through obtaining the modulation signal that amplitude and power all amplifies behind the amplifier He behind the High frequency filter, the three-phase voltage output area is 0 ~ 200V, the three-phase current output area is 0 ~ 100A, and three-phase voltage and current signal are inputted respectively three-phase, gas insulated formula voltage boosting current booster 4A, 4B, 4C.This power source output accurate stable, efficient is high, and internal circuit provides overload protection, output open circuit protection, the interruption protection of mains supply voltage and the feedback interference defencive function of external loading.
Three identical gas-insulating type voltage boosting current booster 4A, 4B and 4C, the structure of its separate unit voltage boosting current booster as shown in Figure 4.4A, 4B, 4C place a stepup transformer and a current lifting device in the sealed shell of tank that is full of the SF6 insulating gas respectively, are connected to respectively 4A, 4B, 4C by the voltage signal of power amplifier 3UA, 3UB, 3UC output
U InTerminal is connected to respectively 4A, 4B, 4C by the current signal of power amplifier 3IA, 3IB, 3IC output
I InTerminal, the on high-tension side output voltage of voltage boosting current booster depend on stepup transformer output, and output current depends on current lifting device output, adopt the method for fictitious power to obtain equivalent high-voltage great-current power source.The specified input voltage of stepup transformer is 200V, and rated output voltage is
KV, rated output capacity 2kVA; The specified input current of current lifting device is 100A, and output-current rating is 1000A rated output capacity 2kVA.Simultaneously, the current transformer (CT) and the voltage transformer (VT) (PT) that are positioned at sealed shell of tank convert large electric current high voltage signal to little current signal
I O1,
I O2And low-voltage signal
U O1,
U O2,
I O1With
U O1Be feedback signal, be connected to backfeed loop 5,
I O2With
U O2Be standard signal, can be connected to the low-voltage standards electric energy meter, consist of the standard high-voltage device for measurement of electrical energy.
Described backfeed loop will be positioned at the voltage transformer pt of sealed shell of tank, the simulating signal of Current Transmit output take the A/D change-over circuit that is arranged in feedback circuit 5 as core by the A/D change-over circuit
U O1With
I O1Convert digital signal and input control system to, control system is processed digital signal processing, obtains amplitude, frequency, the phase place of feedback signal, then regulates accordingly the output in low-voltage signal source, by this close loop control circuit, guarantee the accurate stable of power source output.
The large current power of described three-phase high-voltage source can output rated voltage
KV, the three-phase high voltage of rated current 1000A and large electric current, the mode of connection of phase three-wire three or three-phase and four-line can be adopted in its high-pressure side, phase place between the three-phase is 120 °, 0 ~ 360 ° in (between the voltage and current) phase place is adjustable between amount, its overall power degree of stability can reach 0.02%, it regulates fineness, symmetry, the technical indicators such as waveform distortion can reach the requirement of national metrological verification regulations JJG597 " AC electrical energy meter calibration ", and the overall performance that can be used for the high-voltage electric energy meter of 10kV ~ 35kV phase three-wire three or the three-phase and four-line mode of connection detects and measurement verification
As shown in Figure 5, for using principle and the mode of connection of the large current power of described three-phase high-voltage source calibrating direct access phase three-wire three high-voltage electric energy meter.A, the B that described power source is produced, the three-phase high-voltage connection terminal that the large current signal of C three-phase high-voltage is connected to tested high-voltage electric energy meter, and with three groups of standard output signals of current transformer and voltage transformer (VT) in described power source three gas-insulating type voltage boosting current boosters as shown in Figure 4
I A,
U A,
I B,
U B,
I C,
U CBe connected to the low-voltage standards electric energy meter, then the pulse signal with standard electric energy meter and tested high-voltage electric energy meter all is connected to the error checking platform, is calculated the error of tested high-voltage electric energy meter by checking table.
The content that is not described in detail in this instructions belongs to the known prior art of this area professional and technical personnel.
Claims (6)
1. the large current power of three-phase high-voltage source, comprise by control system, low-voltage signal source, power amplifier, three identical gas-insulating type voltage boosting current boosters and backfeed loop being linked in sequence and forming closed-loop system that it is characterized in that: described low-voltage signal source comprises three-phase voltage low-voltage signal source and three-phase current low-voltage signal source; Described power amplifier comprises three-phase voltage power amplifier and three-phase current power amplifier, and described control system is regulated the output in low-voltage signal source according to described backfeed loop output signal.
2. the large current power of three-phase high-voltage as claimed in claim 1 source, it is characterized in that: digital synthesis technology and phaselock technique have been adopted in described low-voltage signal source, are comprised of crystal oscillator, programmable counter, phaselocked loop, microcontroller, D/A converter and amplifier.
3. the large current power of three-phase high-voltage as claimed in claim 1 source is characterized in that: described control system is divided into voltage, current output value is set, amplitude, frequency, phase measurement, amplitude, frequency, phase adjusted three parts.
4. the large current power of three-phase high-voltage as claimed in claim 1 source, it is characterized in that: it is the PSU10 type power amplifier of 2kVA that described three-phase voltage power amplifier is selected output rating, and it is the PSI10 type power amplifier of 2kVA that the three-phase current power amplifier is selected output rating.
5. the large current power of three-phase high-voltage as claimed in claim 1 source is characterized in that: described every gas-insulating type voltage boosting current booster, and the specified input voltage of its stepup transformer is 200V, rated output voltage is
KV, rated output capacity 2kVA; The specified input current of current lifting device is 100A, and output-current rating is 1000A rated output capacity 2kVA.
6. the large current power of three-phase high-voltage as claimed in claim 1 source, it is characterized in that: current transformer and voltage transformer (VT) in described every gas-insulating type voltage boosting current booster sealed shell of tank convert large electric current high voltage signal to little current signal and low-voltage signal, wherein one the road be connected to backfeed loop, another road is connected to the low-voltage standards electric energy meter.
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Cited By (8)
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| CN103983818A (en) * | 2014-04-04 | 2014-08-13 | 国网山东桓台县供电公司 | Integrated riser boosted apparatus |
| CN104360304A (en) * | 2014-11-07 | 2015-02-18 | 国家电网公司 | Three-phase broadband current generator |
| CN104931914A (en) * | 2015-06-15 | 2015-09-23 | 国网天津市电力公司 | Analog field high voltage energy meter calibration system |
| CN105203986A (en) * | 2015-09-16 | 2015-12-30 | 国家电网公司 | Digital power source tracing method and system |
| CN106443559A (en) * | 2016-06-29 | 2017-02-22 | 中国电力科学研究院 | Arching test system and method for high-voltage electric energy meter |
| CN106707215A (en) * | 2017-01-03 | 2017-05-24 | 北京百度网讯科技有限公司 | Instrument calibration circuit and instrument calibration method |
| CN110429826A (en) * | 2019-08-23 | 2019-11-08 | 河南工业大学 | A kind of multiprogrammability AC power source |
| CN111693837A (en) * | 2020-06-29 | 2020-09-22 | 核动力运行研究所 | Low-voltage signal source |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103983818A (en) * | 2014-04-04 | 2014-08-13 | 国网山东桓台县供电公司 | Integrated riser boosted apparatus |
| CN104360304A (en) * | 2014-11-07 | 2015-02-18 | 国家电网公司 | Three-phase broadband current generator |
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| CN105203986A (en) * | 2015-09-16 | 2015-12-30 | 国家电网公司 | Digital power source tracing method and system |
| CN106443559A (en) * | 2016-06-29 | 2017-02-22 | 中国电力科学研究院 | Arching test system and method for high-voltage electric energy meter |
| CN106443559B (en) * | 2016-06-29 | 2020-04-17 | 中国电力科学研究院 | System and method for testing arc discharge of high-voltage electric energy meter |
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| CN110429826A (en) * | 2019-08-23 | 2019-11-08 | 河南工业大学 | A kind of multiprogrammability AC power source |
| CN111693837A (en) * | 2020-06-29 | 2020-09-22 | 核动力运行研究所 | Low-voltage signal source |
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Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20150616 Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE ELECTRIC P Effective date: 20150616 |
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Effective date of registration: 20150616 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China Electric Power Research Institute Applicant after: Electric Power Research Institute of Jiangsu Electric Power Company Address before: 100192 Beijing city Haidian District Xiaoying East Road No. 15 Applicant before: China Electric Power Research Institute |
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