CN202940741U - 200Kv/10mA rapid polarity conversion direct current generator - Google Patents

200Kv/10mA rapid polarity conversion direct current generator Download PDF

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Publication number
CN202940741U
CN202940741U CN 201220563279 CN201220563279U CN202940741U CN 202940741 U CN202940741 U CN 202940741U CN 201220563279 CN201220563279 CN 201220563279 CN 201220563279 U CN201220563279 U CN 201220563279U CN 202940741 U CN202940741 U CN 202940741U
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China
Prior art keywords
voltage
voltage multiplier
vertical rod
polarity
polarity conversion
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CN 201220563279
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Chinese (zh)
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李华良
李博
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Xi'an High Voltage Electrical Apparatus Research Institute Co ltd
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China XD Electric Co Ltd
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Abstract

The utility model discloses a 200Kv/10mA rapid polarity conversion direct current generator. The 200Kv/10mA rapid polarity conversion direct current generator comprises a dual voltage device, a voltage detection resistor, a current limit resistor, a sample capacitor, an insulation vertical rod and a driving motor, wherein the current limit resistor is fixedly connected with the insulation vertical rod, the insulation vertical rod is fixedly connected with the driving motor, the dual voltage device is connected with the sample capacitor through the current limit resistor, one end of the voltage detection resistor is in grounding connection, and the other end of the voltage detection resistor is connected with the dual voltage device through the current limit resistor. By utilizing an intermediate frequency inversion type direct current generator in the prior art in combination with a skillfully-designed rotary insulation vertical rod structure, detection is carried out through the voltage detection resistor when direct current voltage decreases to lower than 30% of rated voltage, and rapid grounding connection and polarity reversal are carried out by utilizing the rotatable insulation vertical rod, conversion time of an anode and a cathode is greatly shortened; according to theoretical calculation, the 200Kv/10mA rapid polarity conversion direct current generator is capable of realizing rapid polarity conversion of 200kV direct current tolerance in one minute.

Description

200kV/10mA fast polarity conversion dc generator
Technical field
The utility model relates to a kind of 200kV/10mA fast polarity conversion dc generator, is mainly used in the polarity inversion test of 72.5kV and following coupling capacitor, capacitor voltage divider and DC filter capacitors.
Background technology
Coupling capacitor is mainly used in China's power frequency high voltage and ultrahigh-voltage alternating-current transmission line, to realize the purpose of carrier wave, communication, measurement, control, protection and extraction electric energy.Capacitor voltage divider is mainly used in the measurement of power-frequency voltage, limit by technical conditions, still mostly adopts this type of voltage divider in the superhigh pressure occasion at present.DC filter capacitors mainly is arranged on the high voltage DC power transmission converter station DC side, is used for capacitor unit and the capacitor group of DC filter.
Find the more problems that the said goods comes out in the test of direct current withstand voltage and polarity transfer test according to ruuning situation and the national high voltage electric appliance quality supervision and test center pattern test situation summary of the on-the-spot feedback of user.The direct-current polarity backing propeller test is mainly in order to examine DC filter capacitors tolerance of polarity conversion in short-term under extreme operating condition.Under the direct voltage effect, dielectric (the particularly insulating material such as organic silicon rubber) has cumulative effect, thus in polarity transfer process in short-term as easy as rolling off a log generation internal breakdown fault.Therefore the said goods is carried out the direct-current polarity backing propeller test for finding that product latent defect, raising operation of power networks reliability tool are of great significance.
The dc generator of traditional 72.5kV of being used for and following coupling capacitor, capacitor voltage divider, DC filter capacitors direct-current polarity transfer test is by manual or controlling organization, all silicon stacks oppositely to be reset to reach the purpose of polarity inversion after output voltage is reduced to null value, its commutating period is generally longer, is difficult to satisfy the requirement of relevant criterion.
The utility model content
The purpose of this utility model is to provide a kind of 200kV/10mA fast polarity conversion dc generator, to solve the problems of the technologies described above.
A kind of 200kV/10mA fast polarity conversion dc generator comprises voltage multiplier, pressure measurement resistance, current-limiting resistance, test product capacitor, insulation vertical rod and drive motors; Described current-limiting resistance is fixedly connected with the insulation vertical rod, and described insulation vertical rod is fixedly connected with drive motors; Described voltage multiplier connects the test product capacitor by current-limiting resistance; Described pressure measurement resistance one end ground connection, the other end connects voltage multiplier by current-limiting resistance.
The utility model further improves and is: described voltage multiplier comprises positive polarity output voltage multiplier and negative polarity output voltage multiplier; Described drive motors is used for driving current-limiting resistance and connects positive polarity output voltage multiplier or negative polarity output voltage multiplier.
The utility model further improves and is: described 200kV/10mA fast polarity conversion dc generator also comprises EMI filter circuit, power factor correction module, frequency rectifier, half-bridge converter, full-bridge converter and the high-frequency step-up transformer that connects successively; Described high-frequency step-up transformer connects described voltage multiplier.
The utility model further improves and is: the no-load voltage ratio of described high-frequency step-up transformer is 1:100.
The utility model further improves and is: described positive polarity output voltage multiplier and negative polarity output voltage multiplier are level Four voltage multiplying rectifier loop.
The utility model further improves and is: described pressure measurement resistance is 250M Ω.
The utility model further improves and is: described test product capacitor is coupling capacitor, capacitor voltage divider or DC filter capacitors.
Now for prior art, the utlity model has following advantage: adopt existing medium frequency inverted dc generator in conjunction with designing rotating insulated vertical rod structure cleverly, be reduced to rated voltage 30% when following by the pressure measurement resistance detection when direct voltage, utilize rotatable insulation vertical rod to carry out rapid grounding and polarity inversion, greatly shortened positive-negative polarity change-over time, theory is calculated and is shown, it possesses the ability of the fast polarity conversion of completing 200kV direct current withstand voltage in 1min.
Description of drawings
Fig. 1 system principle diagram;
Fig. 2 fast polarity conversion dc generator times pressure cylinder schematic appearance;
Fig. 3 times of pressure cylinder internal structure schematic diagram;
The rotating insulated vertical rod of Fig. 4 motor and pressure measurement resistance;
Fig. 5 polarity conversion schematic diagram;
Fig. 6 cockcroft-walton voltage multiplier loop;
Fig. 7 High voltage output closes the discharging model of having no progeny;
Discharging model after the conversion of Fig. 8 polarity.
Embodiment
Describe the technical solution of the utility model in detail below in conjunction with accompanying drawing.
1, system schema and operation principle
A kind of 200kV/10mA fast polarity conversion of the utility model dc generator mainly is comprised of intermediate frequency commutation inversion device, intermediate frequency input and measurement mechanism, positive polarity output voltage multiplier, negative polarity output voltage multiplier, pressure measurement resistance, current-limiting resistance, rotatable insulation vertical rod and drive motors, the System Working Principle block diagram as shown in Figure 1, for ease of field test, this system adopts single-phase 220V to exchange input.Exchange input and at first pass through EMI(Electro Magnetic Interference) filter circuit, then enter PFC(Power Factor Correction, power factor correction) module.The EMI filter circuit can prevent that a large amount of high order harmonic components that high-frequency circuit produces from entering electrical network, also can stop the various harmonic waves of electrical network to enter rectification circuit, and the PFC module is used for improving the power factor of device.industrial frequency rectifying after process PFC link, alternating current 220V can obtain the approximately direct voltage of 300V after rectification, half-bridge converter is operated in 40kHz, the 300V DC converting that it obtains rectification becomes the continuously adjustable galvanic current of 0 ~ 300V to press, again this galvanic current is pressed the alternation square-wave voltage that is reverse into 40kHz by full-bridge converter, then this square-wave voltage is 1:100 through no-load voltage ratio high-frequency step-up transformer tentatively boosts, can obtain maximum and be about 30kV alternation square-wave voltage, alternation square-wave voltage after tentatively boosting continues to boost through 4 grades of times of hydraulic circuits, finally obtain the high direct voltage that amplitude is about 240kV.
Different from traditional Portable direct flow-generator, fast polarity conversion dc generator described in the utility model is because having positive and negative polarity two cover voltage multipliers, as shown in Figure 3.Its operation principle is after a polarity DC break down voltage finishes, by the pressure measurement resistance R m(250M Ω) detect self discharge reach 30% when following by controlling the vertical rod of insulating of motor rotary actuation, switch polarity and the voltage multiplier by current-limiting resistance Rc and another one reversed polarity are connected and carry out quick charge, thereby reaching positive-negative polarity changes and exports, need not to wait for after voltage is down to zero and commutate again, also need not manual intervention, greatly shortened commutating period.
As shown in Figure 3, Figure 4, fast polarity conversion dc generator adopts the medium frequency inverted dc generator in conjunction with designing rotating insulated vertical rod structure cleverly, operating frequency is brought up to 40kHz from 50Hz, frequency has improved 800 times, make volume of transformer and weight greatly reduce, the capacitance of required filter capacitor also is reduced to 1/800 under power frequency, and the dc ripple coefficient also satisfies standard-required simultaneously.
2, level Four voltage multiplying rectifier loop
Therefore consider the impact of distributed constant, it is very high that the no-load voltage ratio of high-frequency step-up transformer can not be done, and design is coordinated to complete by transformer and voltage multiplying rectifier loop and boosts, and the voltage multiplying rectifier loop as shown in Figure 6.
In figure, ABGH partly is one-level voltage multiplying rectifier loop wherein, when silicon stack 1 conducting, and C 1Be charged to+U m, B point above earth potential 0 ~+2U mBetween the vibration.C 2Be charged to+2U by silicon stack 2 m, the G point obtains stable potential+2U m, voltage is added to C by silicon stack 3 3On, and+U mChange between ~ 0, thereby C 3Be charged to+2U mE point current potential is at+2U m~+4U mChange capacitor C 4Charge to+4U by silicon stack 4 m, so the F point obtains stable+4U mCurrent potential.By that analogy, 3 grades of multiplication of voltages can obtain+6U mOutput voltage, 4 grades of multiplication of voltages can obtain+8U mOutput voltage.That obtain at the outlet side of 1:100 step-up transformer as previously mentioned, is U mTherefore be the ac square-wave voltage of 30kV/40kHz, 4 grades of multiplication of voltages can obtain the high direct voltage of 8 * 30kV=240kV.
3, polarity change-over time and direct voltage ripple coefficient calculate
3.1, the estimation of polarity change-over time
Be converted to example with positive-negative polarity, have no progeny when High voltage output closes, discharging model as shown in Figure 7:
Wherein: E-initial discharge voltage (200kV);
C-capacitive load (being usually, 20000pF for the coupling capacitor maximum capacitance);
R m-pressure measurement resistance (250M Ω);
According to firstorder circuit capacitor discharge formula, test product terminal voltage V=E * e -t/ (RmC)
When t=RmC, V=0.37E: i.e. discharge reaches 37% of positive polarity withstand voltage;
Work as R m=250M Ω, during C=20000pF, t=5s;
Discharge reach the positive polarity withstand voltage 30% the time only need 6.1s, start polarity conversion (less than 10s) this moment, the discharging model of this moment as shown in Figure 8:
Wherein: R c-current-limiting resistance (1M Ω)
Times pressure cylinder of D-another polarity
At this moment, discharge can be completed in 1s, then during less than withstand voltage 1%, can start the process of boosting of negative polarity by pressure measurement resistance detection test product terminal voltage, according to the rate of pressure rise of 5kV/s, can rise in 40s-200kV.
Therefore total time T=6.1s(is discharged to≤30% withstand voltage time)+10s(polarity switching time)+1s(is discharged to≤1% withstand voltage time)+40s(boosts to the reversed polarity withstand voltage time)=57.1s
3.2, the calculating of direct voltage ripple coefficient
As shown in Figure 6, according to multistage multiplication of voltage loop voltage pulsation computing formula:
δU = ± n ( n + 1 ) I p 4 fC
In formula: the n-stages; I p-output average current; The f-ac power frequency;
N-is stages, gets 4 grades for this dc generator;
The capacitance of C-capacitors at different levels;
F is intermediate frequency, gets 40kHz;
Every grade of capacitor C gets 4000pF;
I pFor the output average current, get output-current rating 10mA;
Dc voltage ripple:
δU=4×(4+1)×10×10 -3/(4×40×10 3×4000×10 -12)=0.312kV
The dc ripple coefficient β % = δU U n × 100 % = 0.312 200 × 100 % = 0.156 %
4, conclusion
the utility model uses the medium frequency inverted dc generator in conjunction with design rotatable insulation vertical rod cleverly, significantly reduced the polarity change-over time of dc generator, can be used for coupling capacitance, in capacitor voltage divider and the direct current transportation DC break down voltage and polarity inversion test with filtering capacitor, compare with existing similar dc generator, this novel fast polarity conversion dc generator has adopted two voltage multipliers and rotatable insulation vertical rod to carry out the mentality of designing that fast polarity is switched, change-over time when significantly having shortened the direct-current polarity backing propeller test, for the DC break down voltage level at 200kV with interior test product, positive-negative polarity change-over time was less than 1 minute, satisfy the requirement of relevant criterion.In addition, as long as satisfy charging current less than under rated current, by appropriate change high voltage step-up speed, also can further shorten polarity change-over time.
Although the above is described the utility model by reference to the accompanying drawings; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away from the scope situation that the utility model aim and claim protect, can also make a lot of forms, within these all belong to protection of the present utility model.

Claims (7)

1. a 200kV/10mA fast polarity conversion dc generator, is characterized in that, comprises voltage multiplier, pressure measurement resistance, current-limiting resistance, test product capacitor, insulation vertical rod and drive motors; Described current-limiting resistance is fixedly connected with the insulation vertical rod, and described insulation vertical rod is fixedly connected with drive motors; Described voltage multiplier connects the test product capacitor by current-limiting resistance; Described pressure measurement resistance one end ground connection, the other end connects voltage multiplier by current-limiting resistance.
2. a kind of 200kV/10mA fast polarity conversion dc generator according to claim 1, is characterized in that, described voltage multiplier comprises positive polarity output voltage multiplier and negative polarity output voltage multiplier; Described drive motors is used for driving current-limiting resistance and connects positive polarity output voltage multiplier or negative polarity output voltage multiplier.
3. a kind of 200kV/10mA fast polarity according to claim 1 is changed dc generator, it is characterized in that, described 200kV/10mA fast polarity conversion dc generator also comprises EMI filter circuit, power factor correction module, frequency rectifier, half-bridge converter, full-bridge converter and the high-frequency step-up transformer that connects successively; Described high-frequency step-up transformer connects described voltage multiplier.
4. a kind of 200kV/10mA fast polarity conversion dc generator according to claim 3, is characterized in that, the no-load voltage ratio of described high-frequency step-up transformer is 1:100.
5. a kind of 200kV/10mA fast polarity conversion dc generator according to claim 2, is characterized in that, described positive polarity output voltage multiplier and negative polarity output voltage multiplier are level Four voltage multiplying rectifier loop.
6. a kind of 200kV/10mA fast polarity conversion dc generator according to claim 1, is characterized in that, described pressure measurement resistance is 250M Ω.
7. a kind of 200kV/10mA fast polarity conversion dc generator according to claim 1, is characterized in that, described test product capacitor is coupling capacitor, capacitor voltage divider or DC filter capacitors.
CN 201220563279 2012-10-30 2012-10-30 200Kv/10mA rapid polarity conversion direct current generator Expired - Lifetime CN202940741U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103424583A (en) * 2013-08-13 2013-12-04 中国电力科学研究院 Automatic polarity-changing direct current boosting device
CN108152724A (en) * 2017-12-12 2018-06-12 中国西电电气股份有限公司 A kind of high voltage direct current filter capacitor polarity backing propeller test device and its test method
CN108233715A (en) * 2018-02-27 2018-06-29 国网安徽省电力公司电力科学研究院 A kind of integrated voltage multiplying rectifier cylinder of ultra-high-voltage DC generator
CN108435422A (en) * 2018-03-23 2018-08-24 太以环境科技（北京）有限公司 Atmospheric ionization mode selector

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103424583A (en) * 2013-08-13 2013-12-04 中国电力科学研究院 Automatic polarity-changing direct current boosting device
CN108152724A (en) * 2017-12-12 2018-06-12 中国西电电气股份有限公司 A kind of high voltage direct current filter capacitor polarity backing propeller test device and its test method
CN108233715A (en) * 2018-02-27 2018-06-29 国网安徽省电力公司电力科学研究院 A kind of integrated voltage multiplying rectifier cylinder of ultra-high-voltage DC generator
CN108233715B (en) * 2018-02-27 2024-03-19 国网安徽省电力公司电力科学研究院 Integral voltage doubling rectifying cylinder of extra-high voltage direct current generator
CN108435422A (en) * 2018-03-23 2018-08-24 太以环境科技（北京）有限公司 Atmospheric ionization mode selector
CN108435422B (en) * 2018-03-23 2024-06-07 太以环境科技（北京）有限公司 Atmospheric ionization mode selector

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C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20210823

Address after: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an

Patentee after: XI'AN HIGH VOLTAGE APPARATUS RESEARCH INSTITUTE Co.,Ltd.

Address before: 710075 Shaanxi city of Xi'an Province Tang Hing Road No. 7

Patentee before: CHINA XD ELECTRIC Co.,Ltd.

TR01 Transfer of patent right
CP01 Change in the name or title of a patent holder

Address after: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an

Patentee after: Xi'an High Voltage Electrical Apparatus Research Institute Co.,Ltd.

Address before: 710077 No. 18 West Second Ring Road, Shaanxi, Xi'an

Patentee before: XI'AN HIGH VOLTAGE APPARATUS RESEARCH INSTITUTE Co.,Ltd.

CP01 Change in the name or title of a patent holder
CX01 Expiry of patent term

Granted publication date: 20130515

CX01 Expiry of patent term