CN102254735A - Protection device having functions of automatic control, energy moving and degradation self-separation for vacuum arc extinguish chamber - Google Patents
Protection device having functions of automatic control, energy moving and degradation self-separation for vacuum arc extinguish chamber Download PDFInfo
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- CN102254735A CN102254735A CN2011101913117A CN201110191311A CN102254735A CN 102254735 A CN102254735 A CN 102254735A CN 2011101913117 A CN2011101913117 A CN 2011101913117A CN 201110191311 A CN201110191311 A CN 201110191311A CN 102254735 A CN102254735 A CN 102254735A
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Abstract
The invention relates to a protection device having functions of automatic control, energy moving and degradation self-separation for a vacuum arc extinguish chamber. The protection device comprises an automatic degradation off-line device TQ and an energy-moving component R1 which are arranged in series; the two ends of the energy-moving component R1 are connected with a resistor-capacitor (R-C) loop in parallel; a resistor R and a capacitor C in the R-C loop are connected in series; the automatic degradation off-line device TQ comprises a shell; a fuse is arranged in the shell; quartz sand is filled in the shell; a cavity is formed in the middle of the upper part of the shell; a post-degradation off-line indicator and a pre-compaction spring are arranged in the cavity and sealed in the cavity; the lower end of the fuse is connected with a second electrode; the upper end of the fuse passes through the pre-compaction spring and then is connected with the post-degradation off-line indicator; the upper part of the shell is provided with a first electrode; and a lead line of the first electrode is buried in the quartz sand. By the protection device, the reignition rate of a vacuum breaker can be reduced, and the reignition overvoltage, the shut-off overvoltage and the overvoltage during simultaneous cut-off of three phases can be reduced, so that the arc extinguish chamber of the vacuum breaker can be protected, and other electrical equipment can be also protected.
Description
Technical field
The present invention relates to the protective device of power switchgear, provide the restriction Overvoltage of Vacuum Disconnectors in Operation of the following intermediate voltage electric power system of a kind of 35kV and the protective device that vacuum interrupter is restriked in particular.
Technical background
Plurality of advantages such as maintenance workload is little because vacuum circuit-breaker has, breaking capacity is big, long service life, suitable frequent operation have replaced other type of switch gradually in electric power system, obtained using widely.But, also cause showing great attention to of people in actual applications, because of vacuum circuit-breaker is damming, is restriking or three-phase can produce switching overvoltage when disconnecting, thereby cause the insulation breakdown of equipment such as motor, alternate flashover, serious threat brings significant impact to the insulation of electric equipments such as transformer, motor, capacitor, reactor to safety in production.
Because when vacuum circuit-breaker cut-off little electric current, vacuum arc will be extinguished before zero passage, because electric current cut off suddenly, the inevitable stray capacitance charging to winding of energy that it is stranded in the inductance winding such as motor change electric field energy into.For motor and transformer, particularly zero load or capacity hour, then be equivalent to a big inductance, and the tank capacitance amount is less, therefore can produces big overvoltage, more dangerous when particularly cut-offfing unloaded transformer.
Owing to repeatedly restrike be by contact fracture bang wear, power supply repeatedly to motor electric capacity charge etc. occur repeatedly caused, if opening apart from big inadequately between contact will make to puncture between the arc gap, the recovery voltage of circuit breaker will raise.If it is big inadequately that clearance between open contacts increases, will take place to restrike for the second time, again arc extinguishing, restrike again so that phenomenon take place repeatedly to restrike, repeatedly discharge and recharge vibration, the recovery voltage between contact raises step by step, the voltage of load end also constantly raises, and causes the generation overvoltage of repeatedly restriking, and damages electric equipment.The damage that experiment showed, motor turn-to-turn insulation mainly is that the voltage that causes raises step by step and causes because vacuum circuit-breaker is repeatedly restriked, and the arc reignition overvoltage of high amplitude particularly very easily takes place when cutting off the starting current of motor.
It is because circuit breaker at first cut-offs the phase arc gap produces when restriking that three-phase cut-offs overvoltage simultaneously, the high-frequency current that flows through this phase arc gap causes the rapid zero passage of power current in all the other two-phase arc gaps, cause not cut-off mutually and be cut off thereupon, in other two-phase arc gap, produce the phenomenon of damming of similar big level, thereby produce higher switching overvoltage, in cut-offfing, occur three-phase under small-capacity motor or the light load condition easily and cut-off overvoltage simultaneously.
We know that the basic principle of overvoltage protection is: manage the superpotential electromagnetic energy of formation to be released or consume, to reach the purpose that weakens the overvoltage energy.Usually it is main to address the above problem approach: the one, popularize various lightning arresters and the three phase combined over-voltage protector that uses at present, all are amplitudes of utilizing the residual voltage of ZnO resistors to come over-voltage, but only limited amplitude and can not limit frequency, can't effectively protect electric equipment, and because the response speed relation of zinc oxide, superpotential wave head is steep more, the residual voltage of zinc oxide valve plate high more (will exceeding 20 ~ 35% under the residual voltage ratio switching impulse current under the steep impulse current) then, this make between the withstand voltage with motor cooperate very difficult, dam and the overvoltage of restriking is similar to steep wave, compole is short during wave head, less than 1 μ S, can make various lightning arresters and three phase combined over-voltage protector under the overvoltage of high steepness, be difficult to protect effectively electric equipment; Two improve structure of contact terminals and improve arc control device vacuum degree, make be the arc control device dynamic/static contact just the withstand voltage level separately the time be lower than recovery voltage between two contacts.Conventional way is to take to improve just to have begun the speed opened, adds the big contact distance, improves measures such as arc control device vacuum degree.When recovery voltage was too high, vacuum then might be at the outdoor generation edge flashing of vacuum extinction if voltage is not restriked in the arc control device.Old friends take to strengthen measures such as creepage distance usually on the circuit breaker surface. and practice shows: the method that adopts " reinforced insulation " in the vacuum extinction indoor and outdoor, the flashover rate of restriking in the chamber of arc control device when vacuum circuit-breaker cut-offs outside rate and the chamber is still higher, and accident happens occasionally; Above scheme exists all that residual voltage is too high, protection is unreasonable, protection is unstable, and a series of technical problems such as the automatic exit function of no deterioration have been buried hidden danger to electric power netting safe running.
Solve the problem of restriking of Overvoltage of Vacuum Disconnectors in Operation and arc control device, become the problem that vacuum circuit-breaker presses for solution of promoting the use of.
Summary of the invention
The main technical problem to be solved in the present invention: effectively prevent the Overvoltage of Vacuum Disconnectors in Operation used in the following medium voltage network of 35kV and reduce the breaker vacuum arc control device rate technical problem of restriking.For solving the weak point that existing protected mode exists; the invention provides a kind of automatic control move can, deterioration is from breaking away from and the protective device of vacuum interrupter; it is when the reduction vacuum circuit-breaker is restriked rate; also can reduce the overvoltage of restriking, cut-off overvoltage and three-phase and cut-off overvoltage simultaneously; not only can protect the vacuum circuit-breaker arc control device, also protect other electric equipment.
The technical scheme that the present invention is taked for achieving the above object: a kind of automatic control move can, deterioration is from breaking away from and the protective device of vacuum interrupter, comprising the automatic off-line device of deterioration TQ and move can element R1, both series connection; Described moving can R-C in parallel loop, element R1 two ends, the resistor R in the described R-C loop and capacitor C series connection.
The automatic off-line device of described deterioration TQ comprises shell, be provided with fuse and filling quartz sand in the described shell, shell upper central authorities are cavity, establish after the deterioration off-line indicating device in the described cavity and compress spring in advance, both are sealed in the cavity, and the lower end of described fuse connects second electrode, and the upper end connects with off-line indicating device after the deterioration after passing and compressing spring in advance, described shell upper is established first electrode, and its lead-in wire is embedded in the quartz sand.
Described fuse adopts nickel wire or constantan wire, and its part in being in quartz sand is established the low-melting alloy plumb joint.
Described resistor R is a linear resistor, value 90 ~ 110 Ω; Described capacitor C value 0.1 ~ 0.2 μ F;
Described moving can element R1 be nonlinear resistor, 2mS square wave discharge capacity 400 ~ 800A.
Beneficial effect of the present invention:This device is used with the three phase combined over-voltage protector of the three-phase four stars connection of popularizing; effect is splendid; can receive following benefit: 1. can increase the discharge capacity of the three phase combined over-voltage protector that uses in the original system, 2. can solve various lightning arresters and three phase combined over-voltage protector are difficult to protect effectively electric equipment under the overvoltage of high steepness problem effectively.3. can possess the function that logs off automatically after the fault so that the no deterioration of using in the original system withdraws from the three phase combined over-voltage protection of ability.This device is when the reduction vacuum circuit-breaker is restriked rate; also just greatly reduce the overvoltage of restriking, cut-off overvoltage and three-phase and cut-off overvoltage simultaneously; the vacuum circuit-breaker arc control device have not only been protected; also protected other electric equipment; has multi-faceted defencive function; the protection effect is remarkable, and exquisite composition is treated both principal and secondary aspect of disease.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is that electric single line in actual use of the present invention connects schematic diagram;
Fig. 2 is the automatic off-line device of a deterioration structural representation;
Fig. 3 is the automatic off-line device of deterioration ejects indicating device after deterioration an effect schematic diagram.
Embodiment
Referring to Fig. 1-3, the present invention includes the automatic off-line device of deterioration TQ and move energy element R1, both series connection; Moving can R-C in parallel loop, element R1 two ends, the resistor R in the described R-C loop and capacitor C series connection.
The automatic off-line device of deterioration TQ one end links to each other with vacuum circuit-breaker DL upper contact head, and the other end is connected with moving energy element R1, moves the following contact that the energy element R1 other end is connected to circuit breaker DL.Moving element R1 to be nonlinear resistance, 2mS square wave discharge capacity 400 ~ 800A, and value 800A in this example, discharge capacity is big, non linear coefficient good.In the R-C loop, resistor R is a linear resistor, get 90 ~ 110 Ω, value 100 Ω in this example, effect is to increase attenuation coefficient, consumes higher-order of oscillation electric energy, capacitor C value 0.1 ~ 0.2 μ F, value 0.1 μ F in this example, its effect can reduce wave impedance, can slow down superpotential wave steepness, slows down the climbing of recovery voltage, reduced the electric potential gradient of the turn-to-turn of inductive load, make when restriking high-frequency current by exponential damping, decay to when enough big, the power frequency that occurs in the time of can eliminating the high-frequency current zero passage of restriking continues arc, help reducing arc reignition, this is that present all kinds of lightning arrester can't be accomplished.The automatic off-line device of deterioration TQ makes to log off automatically after the protective device deterioration, guarantees the safety of power network.
Shown in Figure 21 is the automatic off-line device of deterioration TQ, it comprises shell 7, be provided with fuse 4 and filling quartz sand 2 in the shell 7, the middle position on shell 7 tops is a cavity 6, wherein establishes after the deterioration off-line indicating device 1 and compresses spring 5 in advance, and both are sealed in the cavity 6, the lower end of fuse 4 connects second electrode 9, the upper end connects with off-line indicating device 1 after the deterioration after passing and compressing spring 5 in advance, and first electrode 8 is established on shell 7 tops, and its lead-in wire is embedded in the quartz sand 2.Fuse 4 adopts nickel wire or constantan wire, and it establishes low-melting alloy plumb joint 3 in the part that is in quartzy 2.Off-line indicating device 1 ejection indicating section is red after the deterioration, is convenient to observe, and quartz sand 2 can put out electric arc fast behind fuse failure.When low-melting alloy weldering weld temperature reaches about 200 ℃, 3 fusings of low-melting alloy plumb joint, off-line indicating device 1 is realized rapidly isolating with system under the active force that compresses spring 5 in advance after the deterioration, and informs the operations staff by 1 ejection of off-line indicating device after the deterioration.
The present invention is attempted by circuit breaker main contact two ends in actual use, and the overvoltage electromagnetic energy that will form on the one hand high amplitude, high-frequency, high steepness is released fast or consumed; Reduce the climbing and the peak value of recovery voltage between contacts for vacuum-break switches on the other hand greatly, more advanced, more reasonably protect the arc control device of electric equipment and vacuum circuit-breaker.The present invention has designed the automatic off-line device of deterioration TQ, makes protective device possess self-protection function and fault indication function, and red disengaging cap ejects after deterioration more intuitively informs the operations staff.The present invention protects effect remarkable, and exquisite composition is treated both principal and secondary aspect of disease, and is simple in structure, easy for installation, do not take up space.
Obviously those skilled in the art can do various changes and distortion to the technology of the present invention, and do not break away from the spirit and scope of the present invention, like this, if these modifications of the present invention and distortion belong within claim of the present invention and the equivalent technologies scope thereof, then the present invention is also intentional comprises these changes interior.
Claims (4)
- An automatic control move can, deterioration is from breaking away from and the protective device of vacuum interrupter, it is characterized in that: this device comprises the automatic off-line device of deterioration TQ and moves can element R1, both series connection; Described moving can R-C in parallel loop, element R1 two ends, the resistor R in the described R-C loop and capacitor C series connection.
- 2. automatic control according to claim 1 moves can; deterioration is from the protective device of disengaging and vacuum interrupter; it is characterized in that: the automatic off-line device of described deterioration TQ comprises shell (7); be provided with fuse (4) and filling quartz sand (2) in the described shell (7); the middle position on shell (7) top is cavity (6); establish after the deterioration off-line indicating device (1) in the described cavity (6) and compress spring (5) in advance; both are sealed in the cavity (6); the lower end of described fuse (4) connects second electrode (9); the upper end connects with off-line indicating device (1) after the deterioration after passing and compressing spring (5) in advance; first electrode (8) is established on described shell (7) top, and its lead-in wire is embedded in the quartz sand (2).
- 3. automatic control according to claim 2 move can, deterioration is from breaking away from and the protective device of vacuum interrupter, it is characterized in that: described fuse (4) adopts nickel wire or constantan wire, and its part in being in quartz sand (2) is established low-melting alloy plumb joint (3).
- 4. automatic control according to claim 1 move can, deterioration is from breaking away from and the protective device of vacuum interrupter, it is characterized in that: described resistor R is a linear resistor, value 90 ~ 110 Ω; Described capacitor C value 0.1 ~ 0.2 μ F; Described moving can element R1 be nonlinear resistance, and 2mS square wave discharge capacity is 400 ~ 800A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101913117A CN102254735A (en) | 2011-07-08 | 2011-07-08 | Protection device having functions of automatic control, energy moving and degradation self-separation for vacuum arc extinguish chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101913117A CN102254735A (en) | 2011-07-08 | 2011-07-08 | Protection device having functions of automatic control, energy moving and degradation self-separation for vacuum arc extinguish chamber |
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| CN102254735A true CN102254735A (en) | 2011-11-23 |
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| CN2011101913117A Pending CN102254735A (en) | 2011-07-08 | 2011-07-08 | Protection device having functions of automatic control, energy moving and degradation self-separation for vacuum arc extinguish chamber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779600A (en) * | 2015-05-07 | 2015-07-15 | 国家电网公司 | Over-voltage protection method achieved by adoption of dry-type air-core shunt reactor combined over-voltage protection circuit |
| CN106709155A (en) * | 2016-11-30 | 2017-05-24 | 国家电网公司华东分部 | Simulation calculation method for electrical power system arrester |
| CN107069689A (en) * | 2017-05-18 | 2017-08-18 | 安徽天电气技术股份有限公司 | Switch limits device of restriking |
| CN112803367A (en) * | 2021-03-19 | 2021-05-14 | 四川中光防雷科技股份有限公司 | Failure breaking assembly of signal surge protector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1033814A (en) * | 1963-06-27 | 1966-06-22 | English Electric Co Ltd | Improvements in or relating to electrical fuse-links |
| CN101661850A (en) * | 2009-08-27 | 2010-03-03 | 常州市明及电气技术开发有限公司 | Protector for preventing interception over-voltage and arc reignition over-voltage of vacuum circuit breaker |
| CN201868869U (en) * | 2010-12-02 | 2011-06-15 | 合肥伟创电力技术有限公司 | Combined type large-capacity self-separating overvoltage protector |
| CN202159624U (en) * | 2011-07-08 | 2012-03-07 | 合肥凯高电气设备有限公司 | Protection device for vacuum arc extinguishing chamber by auto-control energy transferring and auto-separation in case of degradation |
-
2011
- 2011-07-08 CN CN2011101913117A patent/CN102254735A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1033814A (en) * | 1963-06-27 | 1966-06-22 | English Electric Co Ltd | Improvements in or relating to electrical fuse-links |
| CN101661850A (en) * | 2009-08-27 | 2010-03-03 | 常州市明及电气技术开发有限公司 | Protector for preventing interception over-voltage and arc reignition over-voltage of vacuum circuit breaker |
| CN201868869U (en) * | 2010-12-02 | 2011-06-15 | 合肥伟创电力技术有限公司 | Combined type large-capacity self-separating overvoltage protector |
| CN202159624U (en) * | 2011-07-08 | 2012-03-07 | 合肥凯高电气设备有限公司 | Protection device for vacuum arc extinguishing chamber by auto-control energy transferring and auto-separation in case of degradation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779600A (en) * | 2015-05-07 | 2015-07-15 | 国家电网公司 | Over-voltage protection method achieved by adoption of dry-type air-core shunt reactor combined over-voltage protection circuit |
| CN106709155A (en) * | 2016-11-30 | 2017-05-24 | 国家电网公司华东分部 | Simulation calculation method for electrical power system arrester |
| CN107069689A (en) * | 2017-05-18 | 2017-08-18 | 安徽天电气技术股份有限公司 | Switch limits device of restriking |
| CN112803367A (en) * | 2021-03-19 | 2021-05-14 | 四川中光防雷科技股份有限公司 | Failure breaking assembly of signal surge protector |
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| CB03 | Change of inventor or designer information |
Inventor after: Jiang Gubing Inventor before: Wu Yong Inventor before: Jiang Gubing |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111123 |