CN2713710Y - Combination switch for switching capacitors - Google Patents
Combination switch for switching capacitors Download PDFInfo
- Publication number
- CN2713710Y CN2713710Y CN 200420062581 CN200420062581U CN2713710Y CN 2713710 Y CN2713710 Y CN 2713710Y CN 200420062581 CN200420062581 CN 200420062581 CN 200420062581 U CN200420062581 U CN 200420062581U CN 2713710 Y CN2713710 Y CN 2713710Y
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- current
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- phase
- conversion circuit
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Abstract
The utility model relates to a combination switch for switching capacitors, comprising an SMC and a three-phase bidirectional controlled silicon triggering circuit connected in the phase mode. Each phase main line is connected with the contact of a relay in series. Each contact is all connected with the corresponding bidirectional controlled silicon triggering circuit in parallel. Each phase main line is connected with a current switching circuit by a current mutual inductor. The output end of the current switching circuit is connected with a current detecting device composed of the SCM. When the main current of a power capacitor is abnormal, the utility model is sampled by the current mutual inductor and switched to input into the SCM. The change of the capacity can be displayed in time. The over current can stop cutting and the safety of the power capacitor is protected.
Description
Technical field: the utility model relates to a kind of combination switch that is used to switch power capacitor.
Background technology: in order to improve the power factor of low voltage electric network, one section need is at power transformation room electrification capacitor, and is furnished with combination switch and switches, and prevents that switching from shoving.Power capacitor in use has capacity attenuation and the reactive power compensation deficiency, perhaps in mains by harmonics and power capacitor partial breakdown, produce overcurrent, general combination switch can't detect electric current to be changed, and makes capacitor occur failing in time to dispose when unusual and destroys.And general combination switch also can't detect change in voltage, may make capacitor breakdown.
Summary of the invention: at the deficiencies in the prior art, the switch capacitor combination switch that the utility model provides a kind of detectable electric current to change.
The three-phase bidirectional triode thyristor circuits for triggering that the utility model comprises single-chip microcomputer and is connected, all be serially connected with the contact of a relay on each phase main line, each contact all with corresponding bidirectional triode thyristor circuits for triggering parallel connection mutually, each phase main line connects current conversion circuit by a current transformer, and the output of this current conversion circuit connects single-chip microcomputer and constitutes current sensing means.
When the principal current of power capacitor was unusual, after current conversion circuit rectifying and wave-filtering conversion input single-chip microcomputer, volume change can show in time that overcurrent then can stop switching to the utility model, protection power capacitor safety by the current transformer sampling.
Further specify the utility model below in conjunction with drawings and Examples.
Description of drawings: Fig. 1 is the circuit block diagram of embodiment;
Fig. 2 is electric current, voltage check device schematic diagram;
Fig. 3 is the circuit connection diagram of embodiment.
Embodiment: as shown in the figure, single-chip microcomputer adopts 16F773, all be serially connected with the contact J1-1 of a relay on each phase main line, each contact J1-1 all with corresponding bidirectional triode thyristor circuits for triggering parallel connection mutually, each phase main line connects current conversion circuit by a current transformer L, and the output of this current conversion circuit connects single-chip microcomputer and constitutes current sensing means.Present embodiment also is provided with voltage conversion circuit simultaneously and connects the electric supply transformer secondary output, and the output of this voltage conversion circuit connects single-chip microcomputer and constitutes voltage check device.Current conversion circuit and voltage conversion circuit are actually current rectifying and wave filtering circuit, and electric current, the voltage signal that is sampled to is converted to analog signal input single-chip microcomputer, when electric current, electric voltage exception, in time protect power capacitor safety.
Bidirectional triode thyristor KT in the bidirectional triode thyristor circuits for triggering of each phase and the relay contact J1-1 parallel connection that is serially connected in the homologous lines, the control utmost point of bidirectional triode thyristor KT connects optocoupler trigger MOC3081, after receiving the single-chip microcomputer Continuity signal, bidirectional triode thyristor KT triggering and conducting, after crossing several cycles, be after the main line current/voltage is stablized, output relay signal adhesive contact J1-1 again, end bidirectional triode thyristor KT behind several cycles of adhesive fully, in power capacitor input process, do not have overvoltage, no-flashy-flow like this.Equally, during the excision power capacitor, bidirectional triode thyristor KT triggering and conducting discharges contact J1-1 earlier then fully, disconnects bidirectional triode thyristor KT behind the main line current over-zero.
The relay J 1 of present embodiment is a magnetic latching relay, not power consumption of running, if but grid power blackout during the magnetic latching relay closing of contact, can keep conducting state, present embodiment also is connected with the outage automatic reset circuit, the contact J1-1 of release relay J1 after outage, main line can not connected when outage is switched on again like this, prevents overcurrent.
Claims (3)
1, a kind of switch capacitor combination switch, the three-phase bidirectional triode thyristor circuits for triggering that comprise single-chip microcomputer and be connected, all be serially connected with the contact of a relay on each phase main line, each contact all with corresponding bidirectional triode thyristor circuits for triggering parallel connection mutually, it is characterized by: each phase main line connects current conversion circuit by a current transformer, and the output of this current conversion circuit connects single-chip microcomputer and constitutes current sensing means.
2, switch capacitor combination switch according to claim 1 is characterized by: voltage conversion circuit connects the electric supply transformer secondary output, and the output of this voltage conversion circuit connects single-chip microcomputer and constitutes voltage check device.
3, switch capacitor combination switch according to claim 1 and 2 is characterized by: the relay of the contact on each phase main line is a magnetic latching relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420062581 CN2713710Y (en) | 2004-07-07 | 2004-07-07 | Combination switch for switching capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420062581 CN2713710Y (en) | 2004-07-07 | 2004-07-07 | Combination switch for switching capacitors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2713710Y true CN2713710Y (en) | 2005-07-27 |
Family
ID=34873208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420062581 Expired - Fee Related CN2713710Y (en) | 2004-07-07 | 2004-07-07 | Combination switch for switching capacitors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2713710Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348988C (en) * | 2005-11-11 | 2007-11-14 | 四川电力试验研究院 | On line detecting system with double Y connection wire power capacitor set |
| CN100440680C (en) * | 2006-02-17 | 2008-12-03 | 江苏现代电力电容器有限公司 | Switching low-voltage comprehensive switch of electric power capacitor |
| CN102157946A (en) * | 2011-04-01 | 2011-08-17 | 乐山一拉得电网自动化有限公司 | Stepper type trigger synchronous protection of combination switch and core unit thereof |
-
2004
- 2004-07-07 CN CN 200420062581 patent/CN2713710Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348988C (en) * | 2005-11-11 | 2007-11-14 | 四川电力试验研究院 | On line detecting system with double Y connection wire power capacitor set |
| CN100440680C (en) * | 2006-02-17 | 2008-12-03 | 江苏现代电力电容器有限公司 | Switching low-voltage comprehensive switch of electric power capacitor |
| CN102157946A (en) * | 2011-04-01 | 2011-08-17 | 乐山一拉得电网自动化有限公司 | Stepper type trigger synchronous protection of combination switch and core unit thereof |
| CN102157946B (en) * | 2011-04-01 | 2012-11-21 | 乐山一拉得电网自动化有限公司 | Stepper type trigger synchronous protection of combination switch and core unit thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050727 Termination date: 20130707 |