CN202424145U - Accurate switching device for ship to shore system single-phase grounding fault removal variable reactor - Google Patents
Accurate switching device for ship to shore system single-phase grounding fault removal variable reactor Download PDFInfo
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- CN202424145U CN202424145U CN2012200011163U CN201220001116U CN202424145U CN 202424145 U CN202424145 U CN 202424145U CN 2012200011163 U CN2012200011163 U CN 2012200011163U CN 201220001116 U CN201220001116 U CN 201220001116U CN 202424145 U CN202424145 U CN 202424145U
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Abstract
The utility model discloses an accurate switching device for a ship to a shore system single-phase grounding fault removal variable reactor. A variable reactor is arranged between the neutral point of a ship to shore system and ground. After the electronic power switch of the accurate switching device is connected with a circuit breaker in parallel, the electronic power switch is connected to the variable reactor in series to cause the circuit breaker and the variable reactor to cooperatively work. A voltage to ground value of a neutral point is measured and collected. When the variable reactor needs to be input, the reference point of an inputting time sequence is selected by collecting fault current to control the electronic power switch and an intelligent circuit breaker. When the accurate switching device is used for controlling the electronic power switch and the intelligent circuit breaker, the variable reactor can be guaranteed to be input between the neutral point and the ground on the ideal position. The advantages of the electronic power switch and the intelligent circuit breaker are integrated, the conduction time of the electronic power switch is shortened as much as possible, the service life of the electronic power switch is prolonged, and misoperation is avoided.
Description
Technical field
The utility model relates to the device of the accurate switching of variable reactor in the selective excision of a kind of electric supply installation single phase ground fault, is mainly used in the ship shore electric system, can when system's generation single phase ground fault, selectively excise fault fast.
Background technology
The boats and ships ac power supply system adopts the three-phase three-wire system IT system usually, and power supply continuity is high, but needs could obtain single-phase 220V AC power through step-down transformer, has increased construction and maintenance cost, invests bigger.At present port and pier mostly adopt the three-phase and four-line solidly grounded system, invest for a short time, but power supply continuity is not high.Because the single-phase power load amount of port and pier is big, so adopt the three-phase and four-line solidly grounded system, needn't install step-down transformer additional, can directly obtain single-phase 220V power supply, good economy performance from system.But the port and pier electric power system all adopts the central point direct grounding way, and power supply continuity is not high.Boats and ships pull in to shore, when directly being supplied power by the harbour electric power system, because ship housing links to each other with ground; So ship shore electric is the equal of a solidly grounded system, no matter be boats and ships generation single phase ground fault (often taking place), or harbour generation single phase ground fault; Earth fault current is all very big, can cause in the system distributor breaker tripping operation that is short-circuited, this tripping operation non-selectivity and overstep tripping often takes place; Make the power failure expanded range, and ablation air circuit main contact.The probability that this kind situation takes place when boats and ships maintenance in the pool is very big, and the boats and ships of having relatively high expectations for power supply continuity are unallowed.
Summary of the invention
The purpose of the utility model is; The device of the accurate switching of selective ablation variable reactor behind a kind of ship shore electric system single-phase earthing is proposed; Through the collaborative work of intelligent breaker and electronic power switch, make variable reactor drop into circuit, fast and reliable excision fault in the best time; The assurance electric power system is safe and reliable, reduces the cost of harbour electric power system to the ship power supply that reaches port.
The accurate switching device of the selective excision variable reactor of ship shore electric system single-phase earth fault; Between the neutral point of ship shore electric system and ground, variable reactor is set; Be serially connected on the variable reactor after being provided with electronic power switch and circuit breaker being parallelly connected, make the two collaborative work; When needs carry out switching to variable reactor; Through gathering the reference point of neutral point voltage to earth zero crossing as the switching sequential; Microcontroller is controlled electronic power switch and circuit breaker; Best switching constantly before Ton-△ t send circuit breaker and drop into control command and send electronic power switch in the best time and drop into control command, accurately drop into variable reactor.The breaker closing time can be expressed as Ton ± △ t, and wherein Ton is typical case's service time, is generally tens of milliseconds; △ t is a jitter time, is generally several milliseconds.
After the ship shore electric system generation earth fault, monitoring neutral point voltage to earth value, the best input moment of calculating variable reactor through microcontroller; The zero crossing that promptly extracts the neutral point voltage to earth is considered the ON time and the circuit delay time of electronic power switch, and is compensated as the best input reference point constantly; Send signal by microcontroller, guarantee electronic power switch in the best time conducting, variable reactor is in time put in the system; And the control circuit breaker is closed immediately after the electronic power switch conducting; Electric current behind the system stability can flow through from circuit breaker, controls electronic power switch again and ends, and accomplishes devoting oneself to work of variable reactor.The utility model is based on the detection technique of fault electric weight; Extract neutral point voltage to earth zero crossing point as a reference; And the Changing Pattern of neutral point voltage to earth after the prediction reference point; Follow the Changing Pattern according to the neutral point voltage to earth, the collaborative work of control electronic power switch device and intelligent breaker lets variable reactor put between neutral point and the ground in the best time; The transient current of generation is increased rapidly can trigger the instantaneous release action of line-breaker, excise fault selectively.
The utility model relies on advanced single phase ground fault monitoring technology; Extract after the fault neutral point voltage to earth zero crossing point as a reference; Accurately predict the position of next zero crossing; Utilize the advantage that the electronic power switch conducting is quick, the ON time error is little and the intelligent breaker conduction impedance is little, realize the accurate input of variable reactor.
The key of the utility model is the Collaborative Control problem of electronic power switch and intelligent breaker, should reduce the infringement to electronic power switch, and holding current is continuous again.
The ON time of electronic power switch device is generally in 5us.The frequency of ship shore electric system single-phase earth fault electric current is power frequency 50Hz, and a cycle is 20ms, so the ON time of electronic power switch can ignore, and can think that electronic power switch is instantaneous conducting.But, can not pass to big electric current for a long time because electronic power switch conducting consumption is very big.And the circuit breaker conduction impedance is little, and rated current is big, must be behind the electronic power switch connecting system closed intelligent breaker at once, and electronic power switch ended.Receive the breaker mechanical effect on structure, its closing time has dispersiveness, and the general breaker closing time can be expressed as Ton ± △ t, and wherein Ton is typical case's service time, is generally tens of milliseconds; △ t is a jitter time, is generally several milliseconds.Microcontroller is considered the service time Ton ± △ t of circuit breaker; The moment of Ton before sending the electronic power switch control signal-△ t is sent the intelligent breaker closure signal; Can guarantee 2 △ t time inner breaker connecting systems after the electronic power switch conducting like this, electronic power switch can end after 2 △ t times.Therefore, to bear the maximum of time under perfect condition of big electric current be 2 △ t to electronic power switch.
The device that uses an intelligent breaker and electronic power switch to cooperatively interact drops into variable reactor; When system's generation single phase ground fault; The conducting of the SECO electronic power switch of neutral point voltage to earth and intelligent breaker constantly during according to fault; Variable reactor was dropped in the moment of the best, guarantee quick selective excision fault.Because electronic power switch can not bear big electric current for a long time, therefore after the electronic power switch conducting, should make it the circuit breaker conducting immediately, and the control electronic power switch ends.
The beneficial effect of the utility model is: use the utility model control electronic power switch and circuit breaker; Can guarantee that variable reactor puts between neutral point and the ground at ideal position; Mainly contain following characteristics: the utility model combines self advantage of electronic power switch and intelligent breaker; Not only reduce the ON time of electronic power switch as far as possible, prolonged the useful life of electronic power switch, and avoided misoperation.
The utility model is the deficiency to prior art, based on the mature experience to electric power system malfunction monitoring and failure removal, according to the characteristics of ship power supply system and port and pier electric power system; Design the single phase ground fault selective ablation scheme that is specifically designed to the ship shore electric system; Utilize Principles of Relay Protection, between electric power system neutral point and ground, insert variable reactor, system becomes non-effectively earthed system; Move through the control variable reactor behind system's generation single phase ground fault; Distributor breaker is selectively tripped, excise fault fast, the continued reliability of assurance system power supply.
After system's generation earth fault, when variable reactor during, can in circuit, produce maximum impulse current fast at fault current zero crossing input coefficient, guarantee the action of distributor breaker instantaneous release; Variable reactor in time logs off, and is minimum to the influence that system produces.The general frame-type circuit breaker that uses receives the breaker mechanical effect on structure in the input process of variable reactor, and its contact has certain dispersiveness operate time, causes the actual making time of variable reactor unstable, and is not fixed value.Therefore in real system; The simple intelligent breaker that uses often can not drop into variable reactor in the required moment; The actual input can not accurately be controlled constantly; Finally cause the circuit breaker maybe misoperation or be failure to actuate, and also not necessarily fusing of fuse, do not reach the purpose of quick excision fault.The utility model is that the variable reactor reliability drops into problem in the real system in order to solve; Cooperate the collaborative work of traditional intelligence circuit breaker through the electrification electronic switching device; Can guarantee that variable reactor puts in the system at the time location that requires; Made full use of the characteristics that the electronic power switch conducting is quick, the ON time error is little and the intelligent breaker conduction impedance is low, made this programme both have the ON time weak point, the big advantage of conducting electric current has been arranged again.
Description of drawings
Fig. 1 ship shore electric system single-phase earth fault selective ablation is accurately controlled block diagram;
Fig. 2 electronic power switch and circuit breaker control timing figure.
Specific embodiments
The accurate switching scheme of ship shore electric system single-phase earth fault selective ablation variable reactor; Neutral point voltage to earth according to gathering is chosen reference point; And predict its Changing Pattern, control electronic power switch according to the utility model and cooperate intelligent breaker in the best time conducting, the variable reactor connecting system; Thereby trigger the action of distributor breaker instantaneous release, realize quick selective excision fault.
When selective ablation, if use common circuit breaker to drop into variable reactor, then the moment of the actual access of variable reactor instability can not realize the fast selective excision well.In this programme; Adopt the collaborative variable reactor that drops into of electronic power switch and intelligent breaker; Can guarantee that according to certain control method variable reactor can put in the circuit in the best time; Make it to produce maximum impulse current,, realize having fast the excision of selection single phase ground fault to trigger the action of distributor breaker instantaneous release.
The key of the utility model is the Collaborative Control problem of electronic power switch and intelligent breaker, and suitable control method can make the input of variable reactor accurate constantly and stable.
The concrete examples of applications of system is: ship shore electric system single-phase earth fault selective ablation precise control model is as shown in Figure 1, the input of the parallelly connected common control variable reactor with electronic power switch of intelligent breaker.Behind the ship shore electric system generation single phase ground fault, controller carries out Collaborative Control to circuit breaker and electronic power switch, makes variable reactor at the best time input coefficient.
Electronic power switch and intelligent breaker Collaborative Control sequential are as shown in Figure 2; Controller detects the variation of neutral line voltage to earth; Through calculating its Changing Pattern; Choose reference point, according to the input of the best of latency prediction of circuit breaker constantly, send signal constantly in the best input and open electronic power switch.Because the service time of electronic power switch can be ignored with respect to the time of a cycle of power frequency; Can think that electronic power switch is in the best time conducting; Therefore should shift to an earlier date Ton-△ t time sends the breaker closing signal (wherein Ton is circuit breaker typical case service time; △ t is the maximum dispersion time), guarantee that circuit breaker can be closed in the 2 △ t times after electronic power switch is opened.Through above-mentioned control; Can guarantee that variable reactor can put in the system in the required moment accurately; In the phase circuit that breaks down, produce the maximum transient electric current rapidly; Trigger from the nearest distributor breaker instantaneous release action of earth fault, realize having fast the excision of selection fault.
Claims (1)
1.
The accurate switching device of ship shore electric system single-phase earth fault excision variable reactor,It is characterized in that between the neutral point of ship shore electric system and ground, variable reactor being set, electronic power switch be serially connected on the variable reactor after circuit breaker is parallelly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200011163U CN202424145U (en) | 2012-01-04 | 2012-01-04 | Accurate switching device for ship to shore system single-phase grounding fault removal variable reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200011163U CN202424145U (en) | 2012-01-04 | 2012-01-04 | Accurate switching device for ship to shore system single-phase grounding fault removal variable reactor |
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| CN202424145U true CN202424145U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200011163U Expired - Lifetime CN202424145U (en) | 2012-01-04 | 2012-01-04 | Accurate switching device for ship to shore system single-phase grounding fault removal variable reactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921394A (en) * | 2019-04-15 | 2019-06-21 | 江苏太航信息科技有限公司 | A kind of shipboard automation device with failure removal function |
-
2012
- 2012-01-04 CN CN2012200011163U patent/CN202424145U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921394A (en) * | 2019-04-15 | 2019-06-21 | 江苏太航信息科技有限公司 | A kind of shipboard automation device with failure removal function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210420 Address after: Nanjing City, Jiangsu province 210000 Holford Lane No. 1 Patentee after: ARMY ENGINEERING UNIVERSITY OF CHINA PLA Address before: 210007 4 Rong yuan villa, Nanjing, Jiangsu 102 Patentee before: Wang Jinquan Patentee before: JIANGSU ZHENAN ELECTRIC POWER EQUIPMENT Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120905 |
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| CX01 | Expiry of patent term |