CN104502644A - Ultrahigh-voltage direct-current voltage generator for pollution test - Google Patents
Ultrahigh-voltage direct-current voltage generator for pollution test Download PDFInfo
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Abstract
The invention provides an ultrahigh-voltage direct-current voltage generator for a pollution test. The ultrahigh-voltage direct-current voltage generator comprises a voltage regulator, a silicon-controlled rectifier group, a boosting transformer, a voltage-doubler rectifier, a voltage-current measuring unit, a silicon-controlled rectifier group voltage regulating and stabilizing control device and an operation control console, wherein the voltage regulator is used for regulating alternating-current voltage and outputting the alternating-current voltage to the silicon-controlled rectifier group under the control of the operation control console; the silicon-controlled rectifier group is used for adjusting input voltage of the boosting transformer under the control of the silicon-controlled rectifier group voltage regulating and stabilizing control device; the alternating-current voltage outputted by the boosting transformer is rectified by the voltage-doubler rectifier, and then direct-current voltage is outputted to the two ends of a tested product; the voltage-current measuring unit is used for measuring voltages and currents of the two ends of the tested product and feeding the voltages and the currents back to the silicon-controlled rectifier group voltage regulating and stabilizing control device and an operation control console. The ultrahigh-voltage direct-current voltage generator adopting the technical scheme has the advantages that the operation is simple and flexible, the investment cost is low, the reliability is high, the stability is good, the direct-current voltage between -1600KV and +1600KV can be generated and power is provided for the pollution test of superhigh-voltage and ultrahigh-voltage insulators.
Description
Technical field
The present invention relates to a kind of DC voltage generator, specifically relate to a kind of super, extra-high voltage insulator pollution test extra-high voltage direct-current voltage generator.
Background technology
The determination of the external insulation level of extra-high voltage electric transmission and transformation equipment, consider following three kinds of voltages: lightning surge, switching overvoltage and pollution flashover voltage.Because extra-high voltage electric transmission and transformation system takes the improvement of multiple pressure limiting measure and isolating switch performance, lightning surge and switching overvoltage may be limited to acceptable level, and the external insulation level of line insulator and current conversion station equipment depends on the dirty tolerance level under working voltage.Pollution flashover becomes the major control factors of project of transmitting and converting electricity external insulation design.Compared with plains region, the external insulation pollution flashover problem of high altitude localities merits attention especially.
Super, that extra-high voltage direct-current transmission has stability is high, governing speed is flexible, and the advantages such as long-distance transmissions, so be at home and abroad used widely.But owing to mostly being long distance powedr transmission, the line channel institute of super, extra-high voltage transmission line is mostly circumstance complication through area, the area of as wide in: cloud ± 800kV extra-high voltage direct-current transmission engineering 1/3 is plateau; Burner zone to Shanghai, Ha Minan-Zhengzhou, Xi Luodu-West Zhejiang Province etc. ± 800kV extra-high voltage direct-current transmission engineering across many provinces and cities, line channel circumstance complication, relates to factor many.The lending analysis such as pollution flashover, ice sudden strain of a muscle of insulator, cannot carry out analog computation by numerical simulation, simply can not solve by strengthening nargin by the design experiences of circuit in the past.Extra-high voltage higher grade, and transmission line capability is large, once there is pollution flashover accident, its consequence is quite serious; The research of filth insulation characteristic is very important for the determination of the external insulation parameters such as UHVDC Transmission Lines tower head size, and the test of extra-high voltage direct-current insulator contamination is set up in an urgent demand, to study Flashover Characteristics that is super, extra-high voltage insulator.
± 1100kV extra-high voltage direct-current transmission technology is the peak that HVDC Transmission Technology is new, in overlength distance power transmission project, play irreplaceable vital role.In order to ensure ± and the security of 1100kV extra-high voltage direct-current transmission engineering, take into account economy simultaneously, the filth insulation experimental study of extra-high voltage insulator material object under full-scale conditions must be carried out, to obtain the reference data for engineering design.
In order to simulate high-capacity direct Flow Line working voltage, direct current pollution test power supply must ensure that test product is occurring that, in larger current situation, experiment power supply output voltage keeps relative stability, to guarantee the accuracy of test figure.± 1100kV is brand-new extra-high voltage direct-current electric pressure, external insulation test is carried out to test products such as the insulators of this electric pressure, need the DC voltage generator that Large Copacity, high voltage, low output voltage fluctuate, trial voltage fluctuation is larger, the data scatter obtained when adopting lifting and lowering method to carry out test product voltage resistance test is larger, the deviation of relative standard is higher, is unfavorable for carrying out engineering design.In prior art, experiment power supply electric pressure is up to ± 1000kV, can not meet ± external insulation experimental study the demand of 1100kV and above engineering; On the other hand, experiment power supply is in the single test producing test product voltage resistance results, and output voltage pressure drop is no more than 10%, and relative voltage overshoot is no more than 10% ", output voltage fluctuation is comparatively large, causes test findings accurate not.
Summary of the invention
In order to solve the problems referred to above existing in prior art, the invention provides a kind of pollution test extra-high voltage direct-current voltage generator, this DC voltage generator can produce the DC voltage between-1600KV ~+1600KV, for super, extra-high voltage insulator pollution test provide power supply, in the single test producing test product voltage resistance results, output voltage pressure drop is no more than 5%, relative voltage overshoot is no more than 5%, ± external insulation experimental study the demand of 1100kV and above engineering can be met, improve accuracy and the reliability of pollution test result.
Technical scheme provided by the invention is: a kind of pollution test extra-high voltage direct-current voltage generator, comprises pressure regulator, Group of Silicon Controlled Rectifier, step-up transformer, voltage-doubler rectifier, voltage and current measurement unit, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device and operating console;
Its improvements are: the input end of described pressure regulator is connected with alternating-current voltage source by prime switch cubicle, and its output terminal is connected with the input end of Group of Silicon Controlled Rectifier by rear class switch cubicle; The output terminal of described Group of Silicon Controlled Rectifier is connected with the input end of step-up transformer, the output terminal of described step-up transformer is connected by the input end of harmonics resistance with described voltage-doubler rectifier, and the output terminal of described voltage-doubler rectifier is connected with voltage and current measurement unit by direct current protecting resistance; Described voltage and current measurement unit is connected with described operating console with described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device respectively by signal acquisition circuit, and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is extremely connected with the control of described Group of Silicon Controlled Rectifier by overvoltage protector BOD; Described operating console connects respectively and sends a signal to described pressure regulator and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device.
Preferably, described operating console monitors the input current of described pressure regulator and voltage, the output current of described switch cubicle and the input current of voltage and described stepup transformer and voltage by current transformer and voltage transformer (VT); And output voltage and the electric current of described voltage-doubler rectifier is monitored by current-voltage measurement unit and signal acquisition circuit;
Described operating console judges superpotential or current signal according to the input voltage of described step-up transformer or electric current; when the input voltage of described step-up transformer or electric current excessive time; superpotential or current signal are sent to described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by described operating console, and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device carries out superpotential or overcurrent protection by controlling turning on and off of described Group of Silicon Controlled Rectifier.
Preferably, described operating console is human-computer interaction interface; Described operating console for setting the output voltage values of DC voltage generator, and sends a signal to described pressure regulator and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device respectively;
Described pressure regulator regulates input-output ratio automatically according to described output voltage values;
Described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device exports corresponding trigger pulse according to described output voltage values; and after overvoltage protection by described overvoltage protector BOD, output to the control pole of described Group of Silicon Controlled Rectifier; thus control the turn-on and turn-off of described Group of Silicon Controlled Rectifier, regulate input voltage and the electric current of described stepup transformer.
Preferably, described Group of Silicon Controlled Rectifier comprises two groups of one-way SCRs; Wherein one group of one-way SCR of described two groups of one-way SCRs comprises controllable silicon V11, V12, V13, V14, V15 and V16 of connecting successively, and another group one-way SCR comprises controllable silicon V21, V22, V23, V24, V25 and V26 of connecting successively;
Described controllable silicon V11, V12, V13, V14, V15 and V16 are connected with described controllable silicon V21, V22, V23, V24, V25 and V26 inverse parallel respectively, form six groups of bidirectional triode thyristors;
The anode of described controllable silicon V11 is the input end of described Group of Silicon Controlled Rectifier, and the negative electrode of described controllable silicon V16 is the output terminal of described Group of Silicon Controlled Rectifier.
Further, overvoltage protector BOD comprise respectively with negative electrode and overvoltage protector BOD1, BOD2, BOD3, BOD4, BOD5 and BOD6 of controlling extremely to be connected of bidirectional triode thyristor V11 with V21, bidirectional triode thyristor V12 with V22, bidirectional triode thyristor V13 with V23, bidirectional triode thyristor V14 with V24, bidirectional triode thyristor V15 with V25 and bidirectional triode thyristor V16 with V26.
Further, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device comprises PLC and pulse signal generator;
Described pulse signal generator comprises pulse signal generator A1 and A2, A3 and A4, A5 and A6, A7 and A8, A9 and A10 and A11 and A12 that are connected corresponding to described overvoltage protector BOD1, BOD2, BOD3, BOD4, BOD5 and BOD6 respectively;
Described PLC is connected with A12 with described pulse signal generator A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11 respectively.
Further; described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device receives the voltage and current at product to be tested two ends by PLC; and control described pulse signal generator generation trigger pulse according to described voltage and current value; described trigger pulse exports described silicon controlled to and controls pole after overvoltage protector BOD is comprehensive; trigger described silicon controlled to open or turn off, thus control the input voltage of described step-up transformer.
Preferably, described voltage and current measurement unit comprises voltage divider and current sampling resistor;
Described voltage-doubler rectifier comprises capacitor tower C0, capacitor tower C0 ', high voltage silicon rectifier stack D1, high voltage silicon rectifier stack D2;
One end of described capacitor tower C0 is connected with the anode of described high voltage silicon rectifier stack D1 and the negative electrode of described high voltage silicon rectifier stack D2 respectively, and the two ends of described capacitor tower C0 ' connect the negative electrode of described high voltage silicon rectifier stack D1 and the anode of described high voltage silicon rectifier stack D2 respectively;
To connect between the other end of described capacitor tower C0 and the output terminal of described step-up transformer described harmonics resistance;
The anode of described high voltage silicon rectifier stack D2 connects another output terminal and the ground of described step-up transformer respectively;
The negative electrode of described high voltage silicon rectifier stack D1 is connected with one end of described direct current protecting resistance, and the other end of described direct current protecting resistance connects one end of described voltage divider and one end of product to be tested respectively;
The other end of described product to be tested is connected with one end of described current sampling resistor, and the other end of described current sampling resistor connects the other end and the ground of described voltage divider respectively.
Further, described voltage-doubler rectifier exports product to be tested to through direct current protecting resistance after the High Level AC Voltage that described step-up transformer exports is converted to high voltage direct current;
Described voltage divider gathers the voltage at described product to be tested two ends, and described voltage is transferred to Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by voltage collection circuit, described current sampling resistor acquisition stream through described product to be tested electric current and described electric current is transferred to Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by current collection circuit.
Further, described current sampling resistor comprises five sampling resistors, connects after fast recovery diode in parallel, transient voltage suppressor TVP and zinc paste respectively successively in described five sampling resistor two ends;
Described fast recovery diode, described transient voltage suppressor TVP and described zinc paste are for realizing the overvoltage protection of described sampling resistor.
Further, power frequency supply is connected with described current sampling circuit with described voltage sampling circuit respectively by earth potential restraining device, for providing the working power of described voltage sampling circuit and described current sampling circuit; Counterattack when preventing line flashover, voltage sampling circuit and current sampling circuit caused and the too high destruction that described voltage sampling circuit and described current sampling circuit are caused of earth potential.
Further, described earth potential restraining device comprises inductance L 1, L2, L3, L4, L5 and L6, resistance R1, R2, R3, R4 and RL, Zinc-oxide piezoresistor Re1, Re2 and Re3, and capacitor tower C1, C2, C3 and C4;
Described inductance L 1, L2, L3, described resistance RL, described inductance L 6, L5 with L4 are connected successively; The other end of described inductance L 1 is the input end being connected power frequency supply with the other end of described inductance L 4; The two ends of described resistance RL are the output terminal connecting voltage sampling circuit and current sampling circuit;
Described resistance R1, described capacitor tower C1, C2 are connected successively with described resistance R2; The other end of described resistance R1 is connected with the link of described inductance L 2 with one end and described inductor L1 with described resistance Re1 respectively, and the other end of described resistance R2 is connected with the link of described inductance L 5 with one end of described resistance Re2 and described inductance L 4 respectively; The other end of described resistance Re2 is connected with the other end of described resistance Re1, the link of described capacitor tower C1 with C2 and ground respectively;
Described resistance R3, described capacitor tower C3, C4 are connected successively with described resistance R4; The other end of described resistance R3 is connected with the link of described inductance L 3 with one end and described inductor L2 with described resistance Re3 respectively, and the other end of described resistance R4 is connected with the link of described inductance L 6 with the other end of described resistance Re3 and described inductance L 5 respectively; The link ground connection of described capacitor tower C1 and C2.
Preferably, described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is monitored and the output voltage phase place of the input voltage phase of more described pressure regulator and described voltage-doubler rectifier, regulate the angle of flow of described Group of Silicon Controlled Rectifier according to comparative result, described input voltage phase and described output voltage phase place are consistent.
Compared with immediate technical scheme, the present invention has following marked improvement:
1) DC voltage generator provided by the invention is simple to operate, flexible, cost of investment is low, reliability is high, good stability, in the single test producing test product voltage resistance results, output voltage pressure drop is no more than 5%, relative voltage overshoot is no more than 5%, the experimental study such as can meet the filth of UHVDC Transmission Lines insulator and current conversion station external insulation equipment, icing, drench with rain is to the requirement of experiment power supply, improve accuracy and the reliability of pollution test result, providing important technical support for building super, extra-high voltage direct-current transmission;
2) in the output terminal series AC protective resistance of stepup transformer, the output termination direct current protecting resistance of voltage-doubler rectifier, improves the Short Circuit withstand performance of equipment;
3) the present invention produces trigger pulse by PLC control wave generator, then exports the control pole of Group of Silicon Controlled Rectifier to through overvoltage protector BOD, prevents overvoltage protector BOD to lose pulse phenomenon;
4) the present invention gathers output voltage and the electric current of voltage-doubler rectifier by voltage divider and current sampling resistor, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is exported to again by voltage collection circuit and current collection circuit, the two close cycles voltage-regulating system that current feedback and Voltage Feedback are formed, improves the stability of equipment set;
5) current sampling resistor realizes the measurement of 5 range shelves with five sampling resistors, each sampling resistor two ends are all in parallel three grades of over-voltage protection elements, ensure that measuring system is safe and reliable, the accurate measurement of the pulse-width only shock pulse of 10 μ s can be realized;
6) power frequency supply is connected with current collection circuit with voltage collection circuit by earth potential restraining device, for providing the working power of voltage collection circuit and current collection circuit, the counterattack caused voltage and current measurement part when preventing monitored line flashover and earth potential raise the destruction to system.
Accompanying drawing explanation
Fig. 1 is the hardware block diagram of DC booster provided by the invention;
Fig. 2 is the circuit theory diagrams of DC booster provided by the invention;
Fig. 3 is the structural representation that in Fig. 1, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is connected with Group of Silicon Controlled Rectifier;
Fig. 4 is the circuit theory diagrams that sampling resistor installs three-level protective additional;
Fig. 5 is the structure principle chart of earth potential restraining device.
Embodiment
In order to understand the present invention better, below in conjunction with Figure of description and example, content of the present invention is described further.
As shown in Figure 1 and Figure 2: the nominal input voltage of DC voltage generator provided by the invention is for exchanging 10KV, export-1600KV ~+1600KV adjustable, output-current rating is 2A, electric current be 500mA, under the duration is no more than 0.5 second situation, test product voltage drop is less than 5%, and voltage overshoot is less than 5%.
DC voltage generator forms primarily of operating console, pressure regulator, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device, step-up transformer, voltage-doubler rectifier and measuring system;
The input and output termination AC-DC conversion switch of Group of Silicon Controlled Rectifier, when carrying out DC voltage generation test, need be connected on Group of Silicon Controlled Rectifier between rear class switch cubicle and step-up transformer.
The allomeric function of DC voltage generator is as follows:
Operating console setting DC voltage generator needs the target voltage values exported, and then sends a signal to Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device and pressure regulator; And provide the switching signal of prime switch cubicle and rear class switch cubicle, by manually closing prime switch cubicle and rear class switch cubicle;
Pressure regulator carries out coarse adjustment according to target voltage values, automatically regulates the input-output ratio of self; After front stage switch cubicle is closed, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device sends trigger pulse, this trigger pulse outputs to the control pole of Group of Silicon Controlled Rectifier after overvoltage protector BOD is comprehensive, opens or turn off by triggering Group of Silicon Controlled Rectifier the former limit input current and voltage that regulate step-up transformer; The alternating current that step-up transformer exports is input to voltage-doubler rectifier through harmonics resistance; by voltage-doubler rectifier, alternating current is converted to direct current; direct current outputs to product to be tested insulator through direct current protecting resistance, carries out the Flashover Characteristics research of product to be tested insulator under super, extra-high voltage.Systematic survey measures the voltage and current at product to be tested two ends, and by the voltage and current signal feedback that records to operating console and controllable groups voltage-regulation voltage-stabilization control device, turned on and off according to feedback signal dynamic adjustments silicon controlled by Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device; Operating console is to the voltage and current amplitude at test product two ends and waveform shows and record.
Be below the concrete function introduction of DC voltage generator each several part:
1) operating console
Operating console mainly comprises human-computer interaction interface, uses remote controlled manner; The setting of main realize target magnitude of voltage, controls the lifting of pressure regulator, to the monitoring of each several part electric current and voltage, and the function such as over-voltage over-current protection.
As shown in Figure 2: operating console is by the input voltage of the output voltage of current transformer and the voltage transformer (VT) monitoring input voltage of pressure regulator and electric current, rear class switch cubicle and electric current, stepup transformer and electric current; The voltage and current at product to be tested two ends is monitored by voltage divider and current sampling resistor.Fault analysis and diagnosis can be carried out.
Operating console carries out overvoltage and overcurrent protection by the input voltage and C phase input current of monitoring stepup transformer; when the voltage and current of monitoring is excessive; operating console sends guard signal to Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device, is turned on and off carry out overvoltage and overcurrent protection by Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device control Group of Silicon Controlled Rectifier.
Operating console is by the voltage and current at monitoring product to be tested two ends, and dynamic regulates the output voltage of pressure regulator, maintains the stable output of DC voltage generator.
2) Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device
As shown in Figure 3: Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device mainly comprises PLC and pulse signal generator, it is by the Changing Pattern of voltage divider and current sampling resistor real-time follow-up product to be tested both end voltage and electric current, in conjunction with FUZZY ALGORITHMS FOR CONTROL, computing is carried out to value of feedback, finally provide the controlling value of matrixing, real-time control turn on thyristors, binding operation control desk exports according to product to be tested both end voltage and Current Control pressure regulator in real time, can effectively maintain DC voltage generator output voltage stabilization.
In addition, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is also by the voltage-phase of the input voltage phase and product to be tested two ends that compare pressure regulator, and dynamic adjustments silicon controlled angle of flow, makes input and output phase sequence always, realizes the stable of voltage.
3) Group of Silicon Controlled Rectifier
As shown in Figure 3: the forward and reverse connection of one-way SCR of Group of Silicon Controlled Rectifier 6 series connection, form six groups of bidirectional triode thyristors, often organize bidirectional triode thyristor to be connected with two pulse signal generators of Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by one piece of Overvoltage Protection Board BOD, produce trigger pulse by the PLC control wave generator of Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device, after Overvoltage Protection Board BOD is comprehensive, exports silicon controlled negative electrode respectively to and controls pole; Trigger controllable silicon to open or turn off.
4) pressure regulator
Pressure regulator is single-phase pole structure, nominal input voltage: 10kV, output voltage 0-10.5kV, output-current rating 457A, rated capacity: 4800kVA, under different output voltage, voltage waveform distortion is little, output voltage waveforms distortion little (≤3%), total harmonic component is less than 0.4%.Short-circuit impedance is little, and in the 50%-100% range of nominal tension, short-circuit impedance is less than 5%.
The signal dynamics that pressure regulator can send according to operating console regulates the input-output ratio of self, thus maintains DC voltage generator output voltage stabilization, meets the test demand under different electric pressure.
5) voltage-doubler rectifier
The input termination harmonics resistance of voltage-doubler rectifier, export termination direct current protecting resistance, the resistance of harmonics resistance R7 is 10k Ω, and direct current protecting resistance R0 is 18Kk Ω; The multiplication of voltage capacitor tower C0=2 μ F of voltage-doubler rectifier, filter capacitor tower C0 '=1 μ F;
Multiplication of voltage capacitor tower C0 is connected with ground connection discharge switch with filter capacitor tower C0 ', when after off-test, also there is a large amount of electric charge in multiplication of voltage capacitor tower C0 and filter capacitor tower C0 ', in order to ensure safety, the quantity of electric charge on multiplication of voltage capacitor tower C0 and filter capacitor tower C0 ' all must be drained, there is breakdown between adjacent turns in the protective resistance of traditional ground connection discharge switch partial earth discharge switch when discharging, of long duration, protective resistance can burn out; The present invention adopts the noninductive glaze resistance of high pressure as the protective resistance of grounding switch; Often save grounding switch through the withstand voltage test of 300kV and conductive discharge test, one-piece construction adopts drop hammer type structure, is driven and controls, improve ground connection discharge switch reliability of operation by cylinder.
6) measuring system
Measuring system mainly comprises voltage divider, current sampling resistor Ra, the voltage sampling circuit be connected with voltage divider, the current sampling circuit that is connected with current sampling resistor form;
Voltage divider comprises high-voltage arm R5 and low-voltage arm R6; For measuring the voltage at product to be tested two ends, its measuring-signal exports PLC and the operating console of Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device respectively to after voltage collection circuit collection; Realize the closed-loop control of voltage.
As shown in Figure 4: current sampling resistor Ra comprises five resistance, each resistor coupled in parallel 3 grades of overvoltage protections (fast recovery diode, transient voltage suppressor TVP, zinc paste), guarantees that measuring system is safe and reliable.Current sampling resistor divides 5 range shelves, realizes first measuring the large scale and high accuracy of transient current 1mA-90A, adopts speed up to 500kpbs/s.The accurate measurement of the pulse-width only shock pulse of 10 μ s can be realized.Each range shelves of system can realize the automatic switchover of ns level, ensure the measuring accuracy in 1mA-50mA, 50mA-300mA, 300mA-1.5A, 1.5A-10A, each range ability of 10A-90A.Its measuring-signal exports PLC and the operating console of Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device respectively to after current collection circuit collection, realizes the closed-loop control of electric current.
7) earth potential restraining device
As shown in Figure 5: earth potential restraining device is connected on power supply and between voltage collection circuit and current collection circuit; for providing the working power of measuring system; the power supply of protection system, from interference, prevents the counterattack that causes during monitored line flashover and earth potential from raising destruction to system.
Earth potential restraining device is primarily of voltage-suppressing circuit and filtering circuit composition.Voltage-suppressing circuit is made up of Zinc-oxide piezoresistor, and its effect suppresses surge voltage and electric current; Filtering circuit is made up of LC low-pass filter circuit, for the high fdrequency component in filtered voltage, current signal.
Wherein Zinc-oxide piezoresistor Re1, Re2 be connected on power supply live wire, between zero line and earth point, Re3 is connected between the live wire of power supply and zero line, they inhibit supply voltage and current surge to the impact of load RL.The voltage of earth point and supply voltage link together by capacitor tower C1-C4, and line voltage is associated with earth potential, prevent earthy unexpected change on the impact of power supply.The second order lc circuit be made up of inductance and electric capacity effectively inhibits power supply ripple, the high frequency spurs in filtering circuit and interference.Seal in resistance R1-R4 in circuit and produce self-sustained oscillation to prevent LC filtering circuit.By the reasonable combination of Zinc-oxide piezoresistor and LC filtering circuit, achieve the available protecting to system power supply, ensure that normally carrying out of measurement.Power supply, after inductance L 1 and L4 input, is exported by resistance RL two ends, provides working power to voltage sampling circuit and current sampling circuit.
These are only embodiments of the invention, be not limited to the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all applying within the right of the present invention awaited the reply.
Claims (13)
1. a pollution test extra-high voltage direct-current voltage generator, comprises pressure regulator, Group of Silicon Controlled Rectifier, step-up transformer, voltage-doubler rectifier, voltage and current measurement unit, Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device and operating console;
It is characterized in that: the input end of described pressure regulator is connected with alternating-current voltage source by prime switch cubicle, its output terminal is connected with the input end of Group of Silicon Controlled Rectifier by rear class switch cubicle; The output terminal of described Group of Silicon Controlled Rectifier is connected with the input end of step-up transformer, the output terminal of described step-up transformer is connected by the input end of harmonics resistance with described voltage-doubler rectifier, and the output terminal of described voltage-doubler rectifier is connected with voltage and current measurement unit by direct current protecting resistance; Described voltage and current measurement unit is connected with described operating console with described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device respectively by signal acquisition circuit, and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is extremely connected with the control of described Group of Silicon Controlled Rectifier by overvoltage protector BOD; Described operating console connects respectively and sends a signal to described pressure regulator and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device.
2. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 1, is characterized in that: described operating console monitors the input current of described pressure regulator and voltage, the output current of described switch cubicle and the input current of voltage and described stepup transformer and voltage by current transformer and voltage transformer (VT); And output voltage and the electric current of described voltage-doubler rectifier is monitored by current-voltage measurement unit and signal acquisition circuit;
Described operating console judges superpotential or current signal according to the input voltage of described step-up transformer or electric current; when the input voltage of described step-up transformer or electric current excessive time; superpotential or current signal are sent to described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by described operating console, and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device carries out superpotential or overcurrent protection by controlling turning on and off of described Group of Silicon Controlled Rectifier.
3. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 1, is characterized in that:
Described operating console is human-computer interaction interface; Described operating console for setting the output voltage values of DC voltage generator, and sends a signal to described pressure regulator and described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device respectively;
Described pressure regulator regulates input-output ratio automatically according to described output voltage values;
Described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device exports corresponding trigger pulse according to described output voltage values; and after overvoltage protection by described overvoltage protector BOD, output to the control pole of described Group of Silicon Controlled Rectifier; thus control the turn-on and turn-off of described Group of Silicon Controlled Rectifier, regulate input voltage and the electric current of described stepup transformer.
4. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 1, is characterized in that:
Described Group of Silicon Controlled Rectifier comprises two groups of one-way SCRs; Wherein one group of one-way SCR of described two groups of one-way SCRs comprises controllable silicon V11, V12, V13, V14, V15 and V16 of connecting successively, and another group one-way SCR comprises controllable silicon V21, V22, V23, V24, V25 and V26 of connecting successively;
Described controllable silicon V11, V12, V13, V14, V15 and V16 are connected with described controllable silicon V21, V22, V23, V24, V25 and V26 inverse parallel respectively, form six groups of bidirectional triode thyristors;
The anode of described controllable silicon V11 is the input end of described Group of Silicon Controlled Rectifier, and the negative electrode of described controllable silicon V16 is the output terminal of described Group of Silicon Controlled Rectifier.
5. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 4, is characterized in that:
Overvoltage protector BOD comprise respectively with negative electrode and overvoltage protector BOD1, BOD2, BOD3, BOD4, BOD5 and BOD6 of controlling extremely to be connected of bidirectional triode thyristor V11 with V21, bidirectional triode thyristor V12 with V22, bidirectional triode thyristor V13 with V23, bidirectional triode thyristor V14 with V24, bidirectional triode thyristor V15 with V25 and bidirectional triode thyristor V16 with V26.
6. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 5, is characterized in that:
Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device comprises PLC and pulse signal generator;
Described pulse signal generator comprises pulse signal generator A1 and A2, A3 and A4, A5 and A6, A7 and A8, A9 and A10 and A11 and A12 that are connected corresponding to described overvoltage protector BOD1, BOD2, BOD3, BOD4, BOD5 and BOD6 respectively;
Described PLC is connected with A12 with described pulse signal generator A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11 respectively.
7. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 6, is characterized in that:
Described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device receives the voltage and current at product to be tested two ends by PLC; and control described pulse signal generator generation trigger pulse according to described voltage and current value; described trigger pulse exports described silicon controlled to and controls pole after overvoltage protector BOD is comprehensive; trigger described silicon controlled to open or turn off, thus control the input voltage of described step-up transformer.
8. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 1, is characterized in that:
Described voltage and current measurement unit comprises voltage divider and current sampling resistor;
Described voltage-doubler rectifier comprises capacitor tower C0, capacitor tower C0 ', high voltage silicon rectifier stack D1, high voltage silicon rectifier stack D2;
One end of described capacitor tower C0 is connected with the anode of described high voltage silicon rectifier stack D1 and the negative electrode of described high voltage silicon rectifier stack D2 respectively, and the two ends of described capacitor tower C0 ' connect the negative electrode of described high voltage silicon rectifier stack D1 and the anode of described high voltage silicon rectifier stack D2 respectively;
To connect between the other end of described capacitor tower C0 and the output terminal of described step-up transformer described harmonics resistance;
The anode of described high voltage silicon rectifier stack D2 connects another output terminal and the ground of described step-up transformer respectively;
The negative electrode of described high voltage silicon rectifier stack D1 is connected with one end of described direct current protecting resistance, and the other end of described direct current protecting resistance connects one end of described voltage divider and one end of product to be tested respectively;
The other end of described product to be tested is connected with one end of described current sampling resistor, and the other end of described current sampling resistor connects the other end and the ground of described voltage divider respectively.
9. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 8, is characterized in that:
Described voltage-doubler rectifier exports product to be tested to through direct current protecting resistance after the High Level AC Voltage that described step-up transformer exports is converted to high voltage direct current;
Described voltage divider gathers the voltage at described product to be tested two ends, and described voltage is transferred to Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by voltage collection circuit, described current sampling resistor acquisition stream through described product to be tested electric current and described electric current is transferred to Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device by current collection circuit.
10. a kind of pollution test extra-high voltage direct-current voltage generator as claimed in claim 8, is characterized in that:
Described current sampling resistor comprises five sampling resistors, connects after fast recovery diode in parallel, transient voltage suppressor TVP and zinc paste respectively successively in described five sampling resistor two ends;
Described fast recovery diode, described transient voltage suppressor TVP and described zinc paste are for realizing the overvoltage protection of described sampling resistor.
11. a kind of pollution test extra-high voltage direct-current voltage generators as claimed in claim 9, is characterized in that:
Power frequency supply is connected with described current sampling circuit with described voltage sampling circuit respectively by earth potential restraining device, for providing the working power of described voltage sampling circuit and described current sampling circuit; Counterattack when preventing line flashover, voltage sampling circuit and current sampling circuit caused and the too high destruction that described voltage sampling circuit and described current sampling circuit are caused of earth potential.
12. a kind of pollution test extra-high voltage direct-current voltage generators as claimed in claim 11, is characterized in that:
Described earth potential restraining device comprises inductance L 1, L2, L3, L4, L5 and L6, resistance R1, R2, R3, R4 and R
l, Zinc-oxide piezoresistor Re1, Re2 and Re3, and capacitor tower C1, C2, C3 and C4;
Described inductance L 1, L2, L3, described resistance R
l, described inductance L 6, L5 with L4 be connected successively; The other end of described inductance L 1 is the input end being connected power frequency supply with the other end of described inductance L 4; Described resistance R
ltwo ends be the output terminal connecting voltage sampling circuit and current sampling circuit;
Described resistance R1, described capacitor tower C1, C2 are connected successively with described resistance R2; The other end of described resistance R1 is connected with the link of described inductance L 2 with one end and described inductor L1 with described resistance Re1 respectively, and the other end of described resistance R2 is connected with the link of described inductance L 5 with one end of described resistance Re2 and described inductance L 4 respectively; The other end of described resistance Re2 is connected with the other end of described resistance Re1, the link of described capacitor tower C1 with C2 and ground respectively;
Described resistance R3, described capacitor tower C3, C4 are connected successively with described resistance R4; The other end of described resistance R3 is connected with the link of described inductance L 3 with one end and described inductor L2 with described resistance Re3 respectively, and the other end of described resistance R4 is connected with the link of described inductance L 6 with the other end of described resistance Re3 and described inductance L 5 respectively; The link ground connection of described capacitor tower C1 and C2.
13. a kind of pollution test extra-high voltage direct-current voltage generators as claimed in claim 1, is characterized in that:
Described Group of Silicon Controlled Rectifier voltage-regulation voltage-stabilization control device is monitored and the output voltage phase place of the input voltage phase of more described pressure regulator and described voltage-doubler rectifier, regulate the angle of flow of described Group of Silicon Controlled Rectifier according to comparative result, described input voltage phase and described output voltage phase place are consistent.
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