CN100405731C - Low interference frequency change power for high-voltage testing - Google Patents
Low interference frequency change power for high-voltage testing Download PDFInfo
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- CN100405731C CN100405731C CNB2005100284127A CN200510028412A CN100405731C CN 100405731 C CN100405731 C CN 100405731C CN B2005100284127 A CNB2005100284127 A CN B2005100284127A CN 200510028412 A CN200510028412 A CN 200510028412A CN 100405731 C CN100405731 C CN 100405731C
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Abstract
The present invention relates to a low-interference frequency conversion power supply for high-voltage tests, wherein the input of three-phase alternating current is sent to a triggering control and rectification circuit of a thyristor; a control signal of the triggering control and rectification circuit of the thyristor is generated by a computer control circuit; the rectification output is sent to a bridge output circuit; an output signal of the bridge output circuit is sent to a short circuit box and is sent to an output sampling and measuring circuit; after a sampling signal of the output sampling and measuring circuit passes through the measuring circuit, a measuring signal is sent to the computer control circuit. Likewise, system voltage is sent to the computer control circuit after passing through a system voltage input and measuring circuit; the computer control circuit generates partial discharge by an input control signal needed by a synchronisation and blanking signal generating circuit. The present invention has the advantages of light weight, compact structure, convenient test connection and high anti-interference performance; besides, the field test work of testing personnel is reduced.
Description
Technical field
What the present invention relates to is a kind of power supply of field of power, especially a kind of high voltage test variable frequency power supply.
Background technology
On-the-spot high voltage test will be observed the principle of high voltage test equally: test must dry run field intensity state.Therefore the alternating voltage test can be correct finds out fault, and DC experiment does not then meet above-mentioned high voltage test principle.(power is big for GIS, the voltage height of high voltage test system GIT), and traditional testing transformer or inductance-regulation resonance power supply all are not suitable for on-the-spot the use because weight is too big to be used for crosslinked cable and SF6 insulated electrical equipment.The way that solves is to adopt to exchange resonant power, and its weight can alleviate 15-20 doubly.And present existing interchange resonant power has dual mode: a kind of switch frequency conversion for the SPWM modulation, owing to there is higher switching pulse, itself there is very large disturbance, and can't satisfy on-the-spot office and put test request.This interference can reduce by multiple-stage filtering theoretically, owing to the field condition complexity, on engineering, can not accomplish, and also the equipment heaviness, the on line difficulty, personnel require height to field test, do not have the report of success at present.The another kind of power amplification mode that adopts is by several thousand triode parallel connections.Because the principle defective can't be carried out the major loop protection, poor controllability, complex process, bulky, Heavy Weight, the cost height, poor reliability, and also efficient is low, only is about 50%.And when its low-voltage output, power is output into a square doubly decline, causes the excitation transformer complexity supporting with it, makes and use difficulty.Cause the experiment power supply at scene is required height, have power supply not satisfy situation often and take place, can not test, progressively be eliminated now.
Through the literature search of prior art is found, Chinese patent application number is 00259594.x, and the applying date is on December 14th, 2000, this patent disclosure a kind of employing SPWM variable-frequency series-resonance power supply.Use for reference this type of prior art, can reduce the manufacturing requirement to excitation transformer, raise the efficiency, but can't carry out local discharge test at the scene, influencing office, to put the interference of measurement big, needs special filter, the field connection difficulty.
Summary of the invention
The present invention is directed to deficiency of the prior art, a kind of high voltage test variable frequency power supply is provided, make its volume little, in light weight, the efficient height, technology is simple, and cost is low, the reliability height, electromagnetic interference is little, is applicable to on-the-spot high voltage test.
The present invention is achieved by the following technical solutions, the present invention includes: computer control circuit, controllable silicon triggering control and rectification circuit, bridge-type output circuit, output sampling and measuring circuit, short circuit box, system voltage input and measuring circuit, office put with reaching blanking signal synchronously and produce circuit.The three-phase alternating current input is sent into controllable silicon and is triggered control and rectification circuit, the control signal that controllable silicon triggers control and rectification circuit is produced by computer control circuit, the bridge-type output circuit is sent in its rectification output, the output signal of bridge-type output circuit is sent the short circuit box and is sent into output sampling and measuring circuit, output sampling and measuring circuit with the output signal of bridge-type output circuit as the signal of sampling and after output sampling and measuring circuit the output measuring-signal send into computer control circuit, equally, the output voltage of high voltage test is also sent into computer control circuit after system voltage input and measuring circuit, computer control circuit generation office puts with synchronous control signal and blanking signal and produces the required input control signal of circuit.
Controllable silicon triggers in control and the rectification circuit, form the half control rectified three-phase circuit by the first to the 33 controllable silicon D1～D3 and the first to the 33 diode D4～D6: the first controllable silicon D1, the negative electrode of the second controllable silicon D2 and the 3rd controllable silicon D3 links to each other, the first diode D4, the anode of the second diode D5 and the 3rd diode D6 links to each other, the anode of the 3rd controllable silicon D3 links to each other with the negative electrode of the first diode D4, the anode of the second controllable silicon D2 links to each other with the negative electrode of the second diode D5, the anode of the first controllable silicon D1 links to each other with the negative electrode of the 3rd diode D6, the control signal of the first to the 33 controllable silicon D1～D3 links to each other with computer control circuit, be subjected to the regulating and controlling of computer control circuit, rectification circuit output end inserts a filter capacitor, and filtered direct voltage is sent into the bridge-type output circuit.
Computer control circuit, form by dsp processor, ROM and RAM (memory), LCD display unit, computer communicating circuit, bridge-type output driving circuit, the data that dsp processor will need power down not lose are sent into ROM, the data of temporarily handling are sent into RAM, the information data that dsp processor will show is sent LCD display unit, dsp processor will need the data of communication to pass to the data of computer communicating circuit and receiving computer communicating circuit, and dsp processor is sent the control signal of folk prescription ripple into the bridge-type output driving circuit.
The short circuit box is made up of the IGBT of two serial connections and the monitoring system and the IGBT chip for driving of monitoring output voltage.Monitoring system is sent triggering signal into the IGBT chip for driving, and the IGBT chip for driving drives the IGBT of two serial connections.When the system failure, the former limit of short circuit excitation transformer winding discharges the energy in the high voltage test loop.
Controllable silicon triggers control and rectification circuit adopts the half control rectified three-phase circuit, makes that rectifier output voltage slowly rises when powering on, and reduces the impact of shoving to commutating circuit and flat wave capacitor.
Office puts with reaching blanking signal synchronously and produces circuit by optical coupling isolation circuit, digital filter, push-pull amplifier circuit, step-up transformer, the optical fiber delivery header is formed, dsp processor is sent system frequency and high-frequency impulse, by after the light-coupled isolation as the input signal of digital filter and the switching frequency of digital filter switch inside electric capacity, signal after digital filter comes out directly offers step-up transformer through behind the push-pull amplifier circuit of pliotron, produce the needed synchronizing signal of PD meter device, the dsp processor also office of sending is put blanking control wave driving optical fiber delivery header transmission blanking signal.Dsp processor calculate to produce the control signal of can realization office putting the folk prescription ripple of measurement, controls that full-bridge drives and power circuit is realized required frequency and the duty ratio of output folk prescription ripple, the precision of guarantee test waveform and reliability.Voltage and frequency adjustment are established thick, thin two grades, thereby are in operation meticulous adjustment smoothly, satisfy the condition of on-the-spot high voltage test.
Compared with prior art, the present invention has following outstanding advantage: (1) adopts integrated technique.Multiple functions such as this power supply collection control, power output, system voltage monitoring, blanking signal output, demonstration printing are one, automatically finish test according to user's setting and subjects, need not the personal monitoring.Use the present invention to carry out local discharge test, can avoid shortcomings such as traditional frequency tripling transformer and sine-wave power heaviness, power factor (PF) are low, brought very big convenience for on-the-spot local discharge test.(2) folk prescription ripple power supply is used for local discharge test, efficient is high.Folk prescription ripple power supply is used for local discharge test has broken the tradition that the electric power system local discharge test can only use transformer and sine-wave power.Because the traditional experiment method exists inefficiency, equipment heaviness, on-the-spot power supply capacity there is harsh requirement.And the Switching Power Supply that adopts the folk prescription ripple has only the conducting of switching device and ends loss, and frequency is extremely low, power supply self efficient＞and more than 98%, and by adjusting the resonant frequency point of output frequency to system, output is entirely active loss, has reduced the demand to on-the-spot power supply greatly.The relative conventional power source of the weight of Switching Power Supply itself has remarkable advantages.(3) simple to operation.Folk prescription ripple power supply adopts big liquid crystal display interface, and provide menu to select and input for the user, all sampled values are presented on the screen in real time, and combination function and the function choosing-item that separates are provided, and the user can select full-automatic test or complete manually test or the automatic partially manual test of part.In the process of the test, the user can withdraw from test at any time, has guaranteed the safety of test.After the off-test, result of the test shows on liquid crystal display screen, the printable as required test result of user.(4) interference signal is put in extremely narrow office.Because folk prescription ripple power supply has only 4 square wave edges in each cycle, the interference that the blanking signal that power supply sends 4 certain widths in phase weekly just can the mask switch device.In order to obtain best test effect, power supply provides the width capabilities of setting blanking signal, and the user can regulate to set and realize the target that not only satisfies the local discharge test requirement but also satisfy blanking signal width minimum according to field test.Power supply also provides the phase shift function of blanking signal simultaneously, allows the user can see the office's discharge signal under the blanking signal before the phase shift, guarantees that the office discharge signal of user in whole sine wave period all is visible.
Description of drawings
Fig. 1 circuit block diagram of the present invention;
Fig. 2 triggers control and rectification circuit theory diagram for controllable silicon of the present invention;
Fig. 3 is put with reaching blanking signal synchronously for office of the present invention and is produced schematic block circuit diagram;
Fig. 4 is a computer control circuit theory diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention includes: computer control circuit 1, controllable silicon trigger control and rectification circuit 2, bridge-type output circuit 3, output sampling and measuring circuit 4, short circuit box 5, system voltage input and measuring circuit 6, office put with synchronously and blanking signal produce circuit 7.The three-phase alternating current input is sent into controllable silicon and is triggered control and rectification circuit 2, the control signal that controllable silicon triggers control and rectification circuit 2 is produced by computer control circuit 1, bridge-type output circuit 3 is sent in its rectification output, the output signal of bridge-type output circuit 3 is sent short circuit box 5 and is sent into output sampling and measuring circuit 4, output sampling and measuring circuit 4 with the output signal of bridge-type output circuit 3 as the signal of sampling and after output sampling and measuring circuit the output measuring-signal send into computer control circuit 1, equally, the output voltage of high voltage test is also sent into computer control circuit 1 after system voltage input and measuring circuit 6, computer control circuit 1 generation office puts with synchronous control signal and blanking signal and produces the required input control signal of circuit 7.
Short circuit box 5 is made up of the IGBT of two serial connections and the monitoring system and the IGBT chip for driving of monitoring output voltage.Monitoring system is sent triggering signal into the IGBT chip for driving, and the IGBT chip for driving drives the IGBT of two serial connections.During the system failure, the former limit of short circuit excitation transformer winding discharges the energy in the high voltage test loop.
As shown in Figure 2, controllable silicon triggers in control and the rectification circuit 2, form the half control rectified three-phase circuit by 3 controllable silicon D1～D3 and 3 diode D4～D6, the negative electrode of D1～D3 links to each other, the anode of D4～D6 links to each other, the anode of D3 links to each other with the negative electrode of D4, and the anode of D2 links to each other with the negative electrode of D5, and the anode of D1 links to each other with the negative electrode of D4.The control signal of D1～D3 links to each other with computer control circuit 1, is subjected to the regulating and controlling of computer control circuit 1, and rectification circuit output end inserts a filter capacitor, and filtered direct voltage is sent into bridge-type output circuit 3.
Three-phase alternating-current supply is input to controllable silicon and triggers control and rectification circuit 2, the corresponding thyristor operating angle of computer control circuit 1 control, charging voltage is very low when guaranteeing each charging, thereby the voltage on the capacitor C is slowly risen, and avoids capacitor C and the rectifying tube electric current that withstands shocks.Commutating circuit is a full phase three phase rectifier (angle of flow is all opened) when finishing the back operate as normal and electric capacity charges.Bridge-type output circuit 3 is sent in rectification output.
As shown in Figure 3, office puts with reaching blanking signal generation circuit 7 synchronously and is made up of optical coupling isolation circuit, digital filter, push-pull amplifier circuit, step-up transformer, optical fiber delivery header, dsp processor is sent system frequency and high-frequency impulse in the computer control circuit 1, by behind the optical coupling isolation circuit as the input signal of digital filter and the switching frequency of digital filter switch inside electric capacity.Signal after digital filter comes out directly offers step-up transformer through behind the push-pull amplifier circuit of pliotron, produces the needed synchronizing signal of PD meter device.The dsp processor also office of sending is put blanking control wave driving optical fiber delivery header transmission blanking signal.
As shown in Figure 4, computer control circuit 1 is made up of dsp processor, ROM and RAM (memory), LCD display unit, computer communicating circuit, bridge-type output driving circuit.The data that dsp processor will need power down not lose are sent into ROM, the data of temporarily handling are sent into RAM, the information data that dsp processor will show is sent LCD display unit, dsp processor will need the data of communication to pass to the data of computer communicating circuit and receiving computer communicating circuit, and dsp processor is sent the control signal of folk prescription ripple into the bridge-type output driving circuit.
In addition, the present invention also adopts software to realize automatically testing needed every function: automatic tuning, boost automatically, functions such as self-clocking, automatically phase shift, blanking signal setting, be specially:
Automatic tuning: finish automatic frequency sweep in 300Hz～30Hz scope, and finish and search the system resonance point;
Automatically boost: power supply receives the voltage that the user sets, and slowly boosts to the magnitude of voltage that the user sets, and the voltage and current to system in the process of boosting is monitored, and after finding that high side voltage is unusual, instrument is protected automatically;
Self-clocking: power supply receives timing function after being raised to predetermined voltage, and power supply and compensates from the motion tracking high side voltage during timing.After timing arrived, power supply reduced to 0 with voltage automatically, showed result of the test;
Automatically phase shift: instrument can carry out automatic phase shift function when being raised to predetermined voltage and be in the self-clocking function, software is caught current phase place automatically, and carries out phase adjusted according to the width of blanking signal, at the signal that shows on the PD meter under the former shielding window;
Blanking signal is set: blanking signal is set in the hope of obtaining best innings with the width of the lead on square wave edge and blanking signal relatively put observing effect.
In a word, the present invention is by adopting integrated power output control module and measuring monitoring modular and realize automatic withstand voltage test function.The user can finish whole tests by power supply fully automatically after setting necessary parameter.Well-designed office puts the office that blanking signal matches therewith and puts the requirement that the relevant parameter set-up function makes things convenient for the on-the-spot actual local discharge test of user.Because the system effectiveness height has significantly reduced the requirement to testing ground power supply capacity.
Claims (7)
1. high voltage test variable frequency power supply, comprise: controllable silicon triggers control and rectification circuit (2), bridge-type output circuit (3), output sampling and measuring circuit (4), system voltage input and measuring circuit (6), it is characterized in that, also comprise: computer control circuit (1), short circuit box (5), office puts with reaching blanking signal synchronously and produces circuit (7), the three-phase alternating current input is sent into controllable silicon and is triggered control and rectification circuit (2), the control signal that controllable silicon triggers control and rectification circuit (2) is produced by computer control circuit (1), bridge-type output circuit (3) is sent in its rectification output, the output signal of bridge-type output circuit (3) is sent short circuit box (5) and is sent into output sampling and measuring circuit (4), output sampling and measuring circuit (4) with the output signal of bridge-type output circuit (3) as the signal of sampling and after output sampling and measuring circuit the output measuring-signal send into computer control circuit (1), equally, the output voltage of high voltage test is also sent into computer control circuit (1) after system voltage input and measuring circuit (6), computer control circuit (1) generation office puts with synchronous control signal and blanking signal and produces the required input control signal of circuit (7).
2. high voltage test variable frequency power supply according to claim 1, it is characterized in that, controllable silicon triggers in control and the rectification circuit (2), ((D4～D6) forms the half control rectified three-phase circuit: first controllable silicon (D1) for D1～D3) and the first to the 33 diode by the first to the 33 controllable silicon, the negative electrode of second controllable silicon (D2) and the 3rd controllable silicon (D3) links to each other, first diode (D4), the anode of second diode (D5) and the 3rd diode (D6) links to each other, the anode of the 3rd controllable silicon (D3) links to each other with the negative electrode of first diode (D4), the anode of second controllable silicon (D2) links to each other with the negative electrode of second diode (D5), the anode of first controllable silicon (D1) links to each other with the negative electrode of the 3rd diode (D6), (control signal of D1～D3) links to each other with computer control circuit (1) for the first to the 33 controllable silicon, be subjected to the regulating and controlling of computer control circuit (1), rectification circuit output end inserts a filter capacitor, and filtered direct voltage is sent into bridge-type output circuit (3).
3. high voltage test variable frequency power supply according to claim 1, it is characterized in that, computer control circuit (1), by dsp processor, ROM and RAM memory, the LCD display unit, the computer communicating circuit, the bridge-type output driving circuit is formed, the data that dsp processor will need power down not lose are sent into ROM, the data of temporarily handling are sent into RAM, the information data that dsp processor will show is sent LCD display unit, dsp processor will need the data of communication to pass to the data of computer communicating circuit and receiving computer communicating circuit, and dsp processor is sent the control signal of folk prescription ripple into the bridge-type output driving circuit.
4. high voltage test variable frequency power supply according to claim 3, it is characterized in that dsp processor, the TMS320LF2407A type DSP of employing American TI Company, internal operating frequencies is 30MHz, power supply is 3.3V, and the program space, data space, input/output space all are 32k, the AD of 16 path 10 position transfer ratios, the serial data mouth, serial communication interface, 2 task managers, PWM ripple output channel.
5. high voltage test variable frequency power supply according to claim 1, it is characterized in that, office puts with reaching blanking signal synchronously and produces circuit (7) by optical coupling isolation circuit, digital filter, push-pull amplifier circuit, step-up transformer, the optical fiber delivery header is formed, dsp processor is sent system frequency and high-frequency impulse, by after the light-coupled isolation as the input signal of digital filter and the switching frequency of digital filter switch inside electric capacity, signal after digital filter comes out directly offers step-up transformer through behind the push-pull amplifier circuit, produce the needed synchronizing signal of PD meter device, the dsp processor also office of sending is put blanking control wave driving optical fiber delivery header transmission blanking signal.
6. high voltage test variable frequency power supply according to claim 1, it is characterized in that, short circuit box (5) is made up of the IGBT of two serial connections and the monitoring system and the IGBT chip for driving of monitoring output voltage, monitoring system is sent triggering signal into the IGBT chip for driving, and the IGBT chip for driving drives the IGBT of two serial connections.
7. high voltage test variable frequency power supply according to claim 1 is characterized in that, adopts that software is realized automatically testing needed automatic tuning, boosted automatically, self-clocking, automatic phase shift, blanking signal set-up function.
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| CNB2005100284127A CN100405731C (en) | 2005-08-04 | 2005-08-04 | Low interference frequency change power for high-voltage testing |
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| CN100405731C true CN100405731C (en) | 2008-07-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206242B (en) * | 2007-12-19 | 2010-06-09 | 湖南大学 | Method for controlling voltage and frequency of FM resonance type extra-high voltage test power supply |
| CN103105565B (en) * | 2011-11-09 | 2015-07-08 | 丁一舟 | Series resonance voltage-withstanding partial-discharge test method utilizing frequency modulation phase shift |
| CN103051199A (en) * | 2013-01-21 | 2013-04-17 | 江苏力普电子科技有限公司 | High-voltage frequency converter with over-voltage protection function and over-voltage protection method of frequency converter |
| CN106374737A (en) * | 2016-11-26 | 2017-02-01 | 方彬辉 | Bridge rectifier of high EMI characteristic |
| CN107490752B (en) * | 2017-09-15 | 2020-08-11 | 中国电力科学研究院 | System and method for simulating ultrahigh frequency partial discharge signal |
| CN109283874A (en) * | 2018-11-02 | 2019-01-29 | 武汉南星电力科技有限公司 | Intelligent high-power variable-frequency power sources |
| CN112782538A (en) * | 2020-12-25 | 2021-05-11 | 深圳供电局有限公司 | Cable partial discharge detection method and device based on ultralow frequency power supply cut-off signal |
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| US6362537B2 (en) * | 2000-02-01 | 2002-03-26 | Honda Giken Kogyo Kabushiki Kaisha | Power unit |
| JP2003204675A (en) * | 2002-12-19 | 2003-07-18 | Honda Motor Co Ltd | Portable power unit |
| CN2626127Y (en) * | 2003-06-11 | 2004-07-14 | 皮卫平 | High-voltage experiment-purposed large-power frequency conversion power supply unit |
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| CN1034148C (en) * | 1994-12-23 | 1997-02-26 | 吴健国 | Constant magnetic flux step-by-step rotary pulse width modulation variable frequency power supply |
| US6362537B2 (en) * | 2000-02-01 | 2002-03-26 | Honda Giken Kogyo Kabushiki Kaisha | Power unit |
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Address after: 201108, No. 4399 Jin Du Road, Shanghai, Minhang District Patentee after: SIEYUAN ELECTRIC Co.,Ltd. Address before: 201108, No. 4399 Jin Du Road, Shanghai, Minhang District Patentee before: Shanghai Siyuan Electric Co.,Ltd. |