CN102647020A - Electric power extraction method and device applicable for power network distribution - Google Patents
Electric power extraction method and device applicable for power network distribution Download PDFInfo
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- CN102647020A CN102647020A CN2012101043518A CN201210104351A CN102647020A CN 102647020 A CN102647020 A CN 102647020A CN 2012101043518 A CN2012101043518 A CN 2012101043518A CN 201210104351 A CN201210104351 A CN 201210104351A CN 102647020 A CN102647020 A CN 102647020A
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Abstract
The invention relates to an electric power extraction device which is applicable for power network distribution. The electric power extraction device comprises a high-voltage capacitor and a low-voltage saturation reactor which form a series circuit. The electric power extraction device can replace an independent direct-current power supply panel and a voltage transformer to supply electric power to a secondary system of a power grid. The electric power extraction device is installed at the incoming terminal connected with a transformer station, a switch cabinet, a ring main unit and the like. The electric power extraction device comprises the capacitor, the low-voltage saturation reactor and discharge gaps connected in parallel at the two ends of the low-voltage saturation reactor. The electric power extraction device is characterized in that the capacitor is a high-voltage capacitor with the working voltages at the two ends accounting for above 95% of the voltage of the power grid into which the capacitor is switched; the iron core of the low-voltage saturation reactor can be made of superfine crystal material and can also be made of permalloy material; and the capacity of the capacitor and the number of windings of the reactor are determined according to the voltage class of the power grid, the power capacity demand of the secondary system as well as the wiring mode of the power grid.
Description
Technical field
The present invention relates to a kind of electric energy abstracting method and device that is applied to distribution; Be specially the abstracting method and the device of all kinds of distribution transformer station electrical secondary system power supply that is used for 35kV and following electric pressure, belong to the control and the resist technology field of transformer station in the electric power system.
Background technology
In the electric power system; The secondary device of electrical network; Like electric power meter, protective relaying device, fault filter, communication device, automatic control equipment etc.; All need reliable and stable working power power supply, prior art comprises that mainly the voltage transformer power supply reaches two big types of independently secondary power supply system power supplies.For power distribution network; After transformer station, box-type substation, switch cubicle, ring main unit etc. self and electrical network disconnection, (also do not claim direct current cabinet, battery pack if do not dispose the power supply that constitutes by energy storage battery and inverter; Power cabinet etc.), just can't carry out the operation of catering to of switch with outside electric power network.Therefore occurred in the point of incoming cables of transformer station or switch cubicle electrical network electric energy draw-out device being installed, taken out the ability device like electromagnetic potential transformer, this voltage transformer is installed in the so-called station usually, when station equipment and inlet wire disconnection, then can't use.If be installed in outside the station, inlet wire overvoltage risk can appear again tolerating; And when electromagnetic potential transformer need satisfy error characteristics simultaneously with the requirement of tolerance power network overvoltage, its volume can increase, weight can strengthen, cost rises rapidly.If adopt independently secondary power supply system power supply plan, also existing needs configuration power supply panel separately, and it is many to take the interval, invests problems such as big.China's utility model patent " overhead transmission line is got the ability power supply " (application number: 201020254057.1) reach " cable plug is got the ability power supply " (application number: 201020205090.5) disclosed; Be transformer with get can capacitor connecting device; The latter linked of electric capacity is former limit of transformer and protection module; Transformer secondary side joint AC/DC power module, its weak point is: when the transformer primary voltage changed, its secondary output can be along with variation; Transformer self is resisted the surge voltage ability, and the secondary output stability is relatively poor.
Summary of the invention
The objective of the invention is problem to the background technology proposition; A kind of electric energy abstracting method and device that is applied to distribution disclosed; Comprise high-voltage capacitor and low pressure saturable reactor series circuit, alternative independently DC power supply panel and voltage transformer are to electrical network electrical secondary system supply power, and said device is installed in the end of incoming cables that equipment such as transformer station, switch cubicle, ring main unit link to each other; Can expand the operational mode of electrical network; Strengthen the manipulation function of electrical network, improve the reliability of operation of power networks, reduce the electrical network cost.
Technical scheme of the present invention is: a kind of electric energy draw-out device that is applied to distribution, comprise capacitor, with the low pressure saturable reactor of said capacitors in series, be connected in parallel on the discharging gap at low pressure saturable reactor two ends in addition; It is characterized in that: said capacitor is that the two ends operating voltage accounts for and inserts the high-voltage capacitor of line voltage more than 95%, and low pressure saturable reactor iron core is the ultracrystallite material, also can is the permalloy material; The condenser capacity and the reactor number of turn confirm that to the mode of connection of power supply capacity demand and electrical network its rated operational voltage is 200V ± 20V, rated output capacity≤1270VA according to line voltage grade, electrical secondary system.Its beneficial effect is: the interchange to be operated in reactor under the saturated situation is output as power supply; For all need the power devices of power supply in the transformer station; And when primary voltage changed even surge voltage occurs, reactor still was operated in saturation condition, had reached stable output effect; When overvoltage occurring in the high-voltage capacitance work, discharging gap is at first breakdown because of overvoltage, and a large amount of electric currents is leaked into the earth, and the overvoltage of low pressure saturable reactor tolerance was descended significantly, plays the effect of protection low pressure saturable reactor.
A kind of electric energy abstracting method that is applied to distribution; Be adopt high-voltage capacitor connect with the low tension reactor that is operated in saturated situation, by the reactor of under saturation condition, working all the time power devices method in transformer station, the acting on more than 95% on the high-voltage capacitor of primary voltage; It is characterized in that: adopt at least one circuit type extracting energy; For the neutral-point solid ground network system; Adopt single loop mode extracting energy, the capacitor high-pressure side in the loop connects with high-tension line, output low-tension supply after reactor one end is connected with the capacitor low-pressure end; Reactor other end ground connection, discharging gap is connected in parallel on the reactor two ends; For the neutral nondirect earthing network system; Adopt double loop extracting energy, double loop output low-tension supply mode; The not homophase that the capacitor high-pressure side in each loop gets access to grid; Output low-tension supply after reactor one end is connected with the capacitor low-pressure end, reactor other end ground connection, discharging gap is connected in parallel on the reactor two ends.Its beneficial effect is: to the most of neutral nondirect earthing network system of China, when adopting double loop mode extracting energy, if electric network single-phase earth fault occurs, have a normal extracting energy in loop at least and export electric energy.
Aforesaid a kind of electric energy abstracting method that is applied to distribution, it is characterized in that: said reactor is operated in the saturation interval, is in saturation condition in the work, and the operation voltage of said discharging gap is chosen by two times of electrical secondary system rated operational voltage.
Operation principle of the present invention is (with reference to an accompanying drawing 1): leading 90 ° according to the voltage ratio electric current of inductance; Leading 90 ° of the current ratio voltage of electric capacity; When primary voltage U acts on this electric energy draw-out device; 180 ° of voltage phase difference on high-voltage capacitor C and the low pressure saturable reactor L are in saturation condition and its voltage U during low pressure saturable reactor L work
LLower, primary voltage U
1Mainly act on the high-voltage capacitor C, i.e. voltage U on the capacitor C
C＞＞U
LSo, U
C≈ U
1
This electric energy draw-out device that is used for distribution utilizes the magnetic saturation characteristic of low pressure saturable reactor L, at primary voltage under the condition of certain limit fluctuation, low pressure saturable reactor L two ends output voltage U
2All the time be in metastable state, the parameter of stability and high-voltage capacitor C is relevant with the magnetization curve characteristic of low pressure saturable reactor L.High-voltage capacitor C capacitance is big more, and the magnetization curve gradient of low pressure saturable reactor L is slow more, the voltage U of secondary output
2Stability is high more.
Description of drawings
Accompanying drawing 1 is an electric energy draw-out device basic circuit diagram in the solidly earthed neutral system;
Accompanying drawing 2 is an electric energy draw-out device basic circuit diagram in the neutral point non-direct grounding system;
Accompanying drawing 3 is single-circuit electric energy draw-out device structural representation.
Embodiment
Mark in the accompanying drawing is in the accompanying drawing 1: C-high-voltage capacitor; L-low pressure saturable reactor; G-discharging gap; U
1-primary voltage U
1U
2-secondary output voltage; In the accompanying drawing 2: C
1, C
2-A phase, B phase high-voltage capacitor; L
1, L
2-A phase, B phase low pressure saturable reactor; g
1, g
2-A phase, B phase discharge gap; U
A, U
B-A phase, B phase primary voltage; U
21, U
22-A phase, B phase secondary output voltage; In the accompanying drawing 3: 1-HV Terminal; 2-voltage output end; 3-grounded neutral; 4-high-voltage capacitance; 5-shell; 6-discharging gap; 7-low pressure saturable reactor; 8-nylon cushion block.
Below in conjunction with accompanying drawing inventive embodiments is described further:
Shown in accompanying drawing 1, the present invention is applied to the electric energy abstracting method and the device of distribution, comprises high-voltage capacitor C, the low pressure saturable reactor L that connects with capacitor C and the discharging gap g that is connected in parallel on low pressure saturable reactor L two ends; The iron core of low pressure saturable reactor L is ultracrystallite material or permalloy material; The number of turn of capacitor C capacity and reactor L according to line voltage grade, electrical secondary system power supply capacity is required and the mode of connection of electrical network is confirmed, the operation voltage of discharging gap g is chosen by two times of electrical secondary system rated operational voltage.In the work; Primary voltage acts on more than 95% on the high-voltage capacitor, under saturation condition, works all the time with the low pressure saturable reactor of capacitors in series, even the appearance of overvoltage surge is arranged on circuit like this; Also can on the low pressure saturable reactor, be absorbed; Guaranteed the steady of low pressure saturable reactor two ends output voltages, the discharging gap that is connected in parallel on low pressure saturable reactor two ends is when occurring being used to protect the low pressure saturable reactor under the superpotential situation on the high-voltage capacitor.
Embodiment one:
Be depicted as the electric energy draw-out device for the neutral-point solid ground of 10KV network system like accompanying drawing 1, the rated operational voltage of setting electrical secondary system is 200V ± 20V, rated output capacity S
nBe 1270VA, calculating and design data are following:
The output of electric energy draw-out device need reach 1270VA; The output current that calculates by 200V is 6.35A; The effective voltage value of 10kV electrical network does; The numerical value substitution should be provided certain saturated nargin C value and get 3.53 μ F greater than 3.51uF according to the capacitance that formula
calculates high-voltage capacitor.If select silicon steel sheet as low pressure saturable reactor L core material, close 1.7 teslas that are decided to be of nominal operation magnetic, the area of core section of L is designed to 6cm
2, diameter of wire is got 1.8mm, current in wire density 2.5A, and the last voltage of L is 200V, k gets 0.9, according to formula
Calculate, obtain N and be about 982 circles.When output voltage calculated according to 240V, the capacitance of the high-voltage capacitor that obtains should be greater than 3.51uF, and this moment, the turns calculations of low pressure saturable reactor L was about 1179 circles.The scope of comprehensive output voltage can know that under this condition, the electric capacity of high-voltage capacitor is measured 3.53 μ F, and the number of turn of low pressure saturable reactor L is got 1180 circles.
Put the operation voltage of gap g; With the corresponding apparatus insulated level of electrical secondary system of secondary output is foundation; Can get by 2 times electrical secondary system rated operational voltage, for example the electrical secondary system rated voltage is 220V in this example, puts the operation voltage of gap g so and can get 440V.In addition,, diameter of wire is increased, can improve the stability of secondary output voltage if strengthen area of core section.
Embodiment two:
Shown in accompanying drawing 2, for the electric energy draw-out device of the neutral point indirect earthing of 10KV network system, independently take out can device in the double loop to adopt two, and the rated operational voltage of setting electrical secondary system is 220V ± 20V, rated output capacity S
nDuring for 1270VA, each is taken out the parameter of ability device and chooses according to the computing formula of instance one.In the work, when electrical network generation single phase ground fault, system becomes the situation of neutral-point solid ground, and the state of Fig. 2 becomes the state of Fig. 1 at this moment.When single phase ground fault does not take place electrical network, take out the state that the ability principle presents Fig. 2, behind A or B generation single-phase earthing, the similar electric network single-phase earth fault that occurred, Fig. 2 become the operating state that is similar to Fig. 1 again to this state down.
In the accompanying drawing 2, U
21And U
22Work alone, can get ability simultaneously, also can be only with one, another is as subsequent use.
Claims (3)
1. electric energy draw-out device that is applied to distribution, comprise capacitor, with the low pressure saturable reactor of said capacitors in series, be connected in parallel on the discharging gap at low pressure saturable reactor two ends in addition; It is characterized in that: said capacitor is that the two ends operating voltage accounts for and inserts the high-voltage capacitor of line voltage more than 95%, and low pressure saturable reactor iron core is the ultracrystallite material, also can is the permalloy material; The condenser capacity and the reactor number of turn confirm that to the mode of connection of power supply capacity demand and electrical network its rated operational voltage is 200V ± 20V, rated output capacity≤1270VA according to line voltage grade, electrical secondary system.
2. electric energy abstracting method that is applied to distribution; Be adopt high-voltage capacitor connect with the low tension reactor that is operated in saturated situation, by the reactor of under saturation condition, working all the time power devices method in transformer station, the acting on more than 95% on the high-voltage capacitor of primary voltage; It is characterized in that: adopt at least one circuit type extracting energy; For the neutral-point solid ground network system; Adopt single loop mode extracting energy, the capacitor high-pressure side in the loop connects with high-tension line, output low-tension supply after reactor one end is connected with the capacitor low-pressure end; Reactor other end ground connection, discharging gap is connected in parallel on the reactor two ends; For the neutral nondirect earthing network system; Adopt double loop extracting energy, double loop output low-tension supply mode; The not homophase that the capacitor high-pressure side in each loop gets access to grid; Output low-tension supply after reactor one end is connected with the capacitor low-pressure end, reactor other end ground connection, discharging gap is connected in parallel on the reactor two ends.
3. a kind of electric energy abstracting method that is applied to distribution as claimed in claim 2; It is characterized in that: said reactor is operated in the saturation interval; Be in saturation condition in the work, the operation voltage of said discharging gap is chosen by two times of electrical secondary system rated operational voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101043518A CN102647020A (en) | 2012-04-11 | 2012-04-11 | Electric power extraction method and device applicable for power network distribution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101043518A CN102647020A (en) | 2012-04-11 | 2012-04-11 | Electric power extraction method and device applicable for power network distribution |
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| CN102647020A true CN102647020A (en) | 2012-08-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066825A (en) * | 2018-09-21 | 2018-12-21 | 福州大学 | 220kV transmission line insulator lightning conducter based on Switching Power Supply takes can method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1118301A (en) * | 1997-06-26 | 1999-01-22 | Takaoka Electric Mfg Co Ltd | Ground installation capacitor for electric power |
| JP2009148162A (en) * | 2009-03-30 | 2009-07-02 | Toshiba Corp | Noise filter |
| CN201717792U (en) * | 2010-07-08 | 2011-01-19 | 西安兴汇电力科技有限公司 | Energy taking power supply of overhead line |
| CN202772666U (en) * | 2012-04-11 | 2013-03-06 | 中国电力科学研究院 | Electric energy extracting device applying to network distribution |
-
2012
- 2012-04-11 CN CN2012101043518A patent/CN102647020A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1118301A (en) * | 1997-06-26 | 1999-01-22 | Takaoka Electric Mfg Co Ltd | Ground installation capacitor for electric power |
| JP2009148162A (en) * | 2009-03-30 | 2009-07-02 | Toshiba Corp | Noise filter |
| CN201717792U (en) * | 2010-07-08 | 2011-01-19 | 西安兴汇电力科技有限公司 | Energy taking power supply of overhead line |
| CN202772666U (en) * | 2012-04-11 | 2013-03-06 | 中国电力科学研究院 | Electric energy extracting device applying to network distribution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066825A (en) * | 2018-09-21 | 2018-12-21 | 福州大学 | 220kV transmission line insulator lightning conducter based on Switching Power Supply takes can method |
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| PB01 | Publication | ||
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| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121227 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121227 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: State Grid Corporation of China Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20120822 |