CN203243055U - Intelligent synchronous zero crossing switch for low-voltage capacitor - Google Patents
Intelligent synchronous zero crossing switch for low-voltage capacitor Download PDFInfo
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- CN203243055U CN203243055U CN 201320280236 CN201320280236U CN203243055U CN 203243055 U CN203243055 U CN 203243055U CN 201320280236 CN201320280236 CN 201320280236 CN 201320280236 U CN201320280236 U CN 201320280236U CN 203243055 U CN203243055 U CN 203243055U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The utility model discloses an intelligent synchronous zero crossing switch for a low-voltage capacitor, comprising a synchronous zero crossing detection control unit and a low-voltage vacuum contactor. The intelligent synchronous zero crossing switch takes a single chip microcomputer as the core, is assisted by a sampling loop and reasonable program design, solves the problems of high voltage harmonic wave and inrush current during the input/cutoff of the low-voltage capacitor, and improves the safety and reliability of a capacitor switching switch. The intelligent synchronous zero crossing switch has the advantages of low manufacturing cost, simple and durable structure, and few power consumption.
Description
Technical field
The utility model relates to the technical field of electric power switching control appliance, specifically a kind of low-voltage capacitance intelligent synchronization zero passage switch and be used for the method for control capacitor group switching.
Background technology
Traditional high-pressure reactive compensation device generally adopts secondary capacitor switching Special contactor or combination switch or thyristor switchable capacitor group, with the switching of idle compensating control control switch, realizes the automatic operation of capacitor group.
For contactor control feeding type compensation arrangement, because the voltage of capacitor can not transition, so can form very large shoving when capacitor directly dropped into, the maximum of shoving even surpass 100 times of capacitor rated current.Shoving of producing can produce unfavorable interference to electrical network, reduces the useful life of capacitor.In order to reduce to shove, what most of compensation arrangement adopted is the capacitor switching Special contactor, this contactor has one group of series limiting resistor and the auxiliary contact in parallel with main contact, in the process of contactor adhesive, auxiliary contact is at first connected, and makes capacitor carry out precharge by current-limiting resistance access main circuit, and then main contact is connected, capacitor is normally accessed main circuit, in this way can be with inrush current limiting at below 20 times of capacitor rated current.This compensation arrangement is cheap, and reliability is higher, uses the most general.But because the contact life-span of A.C. contactor is limited, be not suitable for frequent switching, be not suitable for the load condition of frequent variations.
For thyristor control feeding type compensation arrangement, because the necessary zero cross fired of thyristor that is to say that working as the thyristor both end voltage is zero moment to send triggering signal.Zero cross fired can realize that no-flashy-flow drops into capacitor, and in addition, the triggering times of thyristor can realize accurate dynamic compensation (response time is at Millisecond) without limits, is applicable to the frequent switching to capacitor.But because the pressure drop of thyristor conducting voltage is about about 1V, loss is very large, so must use large-area fin and use draft fan.In addition, thyristor is very responsive to voltage change ratio (dv/dt), is easy to mislead and the damage of being shoved when running into the situation of the voltage jumps such as switching overvoltage and thunderbolt.This compensation arrangement complex structure, price is high, and reliability is relatively poor, and loss is large, is mainly used in the occasion of load frequent variations.
For combination switch control feeding type compensation arrangement, so-called combination switch is exactly with thyristor use in parallel with relay tip, realize that by thyristor voltage zero-cross drops into and the current over-zero excision, pass through continuous current by relay tip, so not only avoid the conduction loss problem of thyristor, also eliminated shoving when capacitor drops into simultaneously.But the combination switch technology has not only been used thyristor but also use relay, and the very complex so its structure becomes is same owing to thyristor also damages than being easier to the sensitiveness of voltage change ratio (dv/dt).
The utility model content
For solving the technical problem of above-mentioned existence, the utility model provides the method for a kind of low-voltage capacitance intelligent synchronization zero passage switch and control capacitor group switching; The vacuum contactor that with electric pressure is 1140V combines with modern microelectric technique.It is simple that it has absorbed low-voltage vacuum contactor control structure, and thyristor control switch no-voltage drops into, the characteristics of zero current excision, take single-chip microcomputer as core, is aided with sampling circuit, has solved the humorous problem of shoving that involves of the high voltage that occurs in the capacitor switching process.
The technical scheme in the invention for solving the technical problem is: a kind of low-voltage capacitance intelligent synchronization zero passage switch comprises synchronization zero-cross detection control unit and low-voltage vacuum contactor.
The low-voltage vacuum contactor comprises permanent-magnet operating mechanism.
The synchronization zero-cross detection control unit comprises input and output interface and the single-chip microcomputer of voltage and current over-zero sample circuit, voltage and current time reference point testing circuit, operational order.Described synchronization zero-cross detection control unit is by detecting the phase place of voltage or electric current, and calculates divide-shut brake operate time according to presetting operation condition, calculates the time that the instruction time-delay is sent.
The synchronization zero-cross detection control unit adopts integral structure, and it is little to have a volume, does not take up room, and is convenient to the characteristics such as installation.
Described synchronization zero-cross detection control unit through time-delay, is sent action command to the permanent-magnet operating mechanism of described low-voltage vacuum contactor after receiving the action command of input.
The permanent-magnet operating mechanism of low-voltage vacuum contactor has the advantages such as divide-shut brake speed is fast, spring is little, stable performance, idle.
The beneficial effects of the utility model are: solved not only that the high voltage that occurs in the capacitor switching process is humorous to involve the problem of shoving, and improved the security reliability of capacitor switching switch.In addition, this low-voltage capacitance intelligent synchronization zero passage switch low cost of manufacture, simple in structure durable, power consumption is few.Because the low-voltage vacuum contactor has excellent electric property, thereby so that this low-voltage capacitance intelligent synchronization zero passage switch can be controlled the jumbo capacitor group of switching.
Description of drawings
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is structural representation of the present utility model;
Among the figure: 1 synchronization zero-cross detection control unit, 2 permanent-magnet operating mechanisms, 3 operator links, 4 buffer springs, 5 vacuum tubes, 6 inlet wire copper bars, 7 outlet copper bars, 8 housings.
Embodiment
Below in conjunction with accompanying drawing theory and structure of the present utility model is made further instructions.
As illustrated in fig. 1 and 2:
A kind of low-voltage capacitance intelligent synchronization zero passage switch comprises the synchronization zero-cross detection control unit 1 and the low-voltage vacuum contactor that are encapsulated in the housing 8.Wherein synchronization zero-cross detection control unit 1 comprises input and output interface and the single-chip microcomputer of voltage and current over-zero sample circuit, warning circuit, voltage and current time reference point testing circuit, operational order.This synchronization zero-cross detection control unit is by detecting voltage, current phase, and calculates divide-shut brake operate time, the time that the computations time-delay is sent according to presetting operation condition.
Described low-voltage vacuum contactor is prior art, and it comprises permanent-magnet operating mechanism 2, operator link 3, buffer spring 4, vacuum tube 5, inlet wire copper bar 6 and outlet copper bar 7.
Described synchronization zero-cross detection control unit through time-delay, is sent action command to described low-voltage vacuum contactor after receiving the action command of input.
The method that the control capacitor group that is used for this low-voltage capacitance intelligent synchronization zero passage switch puts into operation is as follows:
After the requirement input that described synchronization zero-cross detection control unit 1 reception peripheral control unit transmits or the control signal of excision capacitor group this signal is delivered to single-chip microcomputer.
Described voltage and current over-zero sample circuit are sampled to the voltage of main circuit or the phase place of electric current in real time.
Voltage and current over-zero sample circuit will be sent to the sample information of voltage or electric current voltage and current time reference point testing circuit, by it voltage of sampling or the phase time reference point of electric current be detected.
Single-chip microcomputer is to the detection information screening property detection of voltage and current time reference point testing circuit feedback, select an immediate zero crossing of reference voltage or electric current as start time, computations time-delay is sent the needed time, and finally sends action command to the permanent-magnet operating mechanism 2 of described low-voltage vacuum contactor.
Take order that the capacitor group is put into operation as example, the method that the control capacitor group that is used for this low-voltage capacitance intelligent synchronization zero passage switch puts into operation is: the peripheral control unit input command is sent to described single-chip microcomputer through the input interface of the operational order of described synchronization zero-cross detection control unit 1, described voltage and current over-zero sample circuit are sampled to the phase information of the voltage of main circuit in real time, and sample information is sent to described voltage and current time reference point testing circuit, and by this circuit the reference time point of the voltage-phase information of sampling is made detection, and testing result reaches single-chip microcomputer the most at last, screen detection and draw the zequin of a nearest zero crossing of reference voltage as the computation delay time by single-chip microcomputer, through suitable time-delay, single-chip microcomputer sends action command to described low-voltage vacuum contactor.The coil of the permanent magnet mechanism 2 of described low-voltage vacuum contactor gets described operator link 3 actions of electric drive and described buffer spring is compressed, and then described inlet wire copper bar 6 makes described low-voltage vacuum contactor closure, the most at last capacitor group access main circuit with described outlet copper bar 7 described vacuum tube 5 interior contacts.
The method of capacitor group excision operation in like manner can be drawn, therefore repeat no more.
Claims (1)
1. a low-voltage capacitance intelligent synchronization zero passage switch comprises the low-voltage vacuum contactor, and described low-voltage vacuum contactor comprises permanent-magnet operating mechanism (2), it is characterized in that:
Also comprise synchronization zero-cross detection control unit (1);
Described synchronization zero-cross detection control unit (1) comprises input and output interface and the single-chip microcomputer of voltage and current over-zero sample circuit, voltage and current time reference point testing circuit, operational order;
Described synchronization zero-cross detection control unit (1) is by detecting the phase place of voltage or electric current, and calculates divide-shut brake operate time according to presetting operation condition, calculates the time that the instruction time-delay is sent;
Described synchronization zero-cross detection control unit (1) through time-delay, is sent action command to the permanent-magnet operating mechanism (2) of described low-voltage vacuum contactor after receiving the action command of input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320280236 CN203243055U (en) | 2013-05-21 | 2013-05-21 | Intelligent synchronous zero crossing switch for low-voltage capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320280236 CN203243055U (en) | 2013-05-21 | 2013-05-21 | Intelligent synchronous zero crossing switch for low-voltage capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN203243055U true CN203243055U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320280236 Expired - Fee Related CN203243055U (en) | 2013-05-21 | 2013-05-21 | Intelligent synchronous zero crossing switch for low-voltage capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326372A (en) * | 2013-05-21 | 2013-09-25 | 国家电网公司 | Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching |
-
2013
- 2013-05-21 CN CN 201320280236 patent/CN203243055U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326372A (en) * | 2013-05-21 | 2013-09-25 | 国家电网公司 | Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: STATE GRID SHANDONG PINGYIN POWER SUPPLY CO. Patentee after: Shandong Sunkist Electric Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: Pingyin County Power Supply Co.,Ltd. Patentee before: Shandong Sunkist Electric Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20160601 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: PINGYIN POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: Shandong Sunkist Electric Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: STATE GRID SHANDONG PINGYIN POWER SUPPLY CO. Patentee before: Shandong Sunkist Electric Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20170521 |
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| CF01 | Termination of patent right due to non-payment of annual fee |