CN102064549B - AC capacitor operation/cutting method and fling-cut switch circuit - Google Patents
AC capacitor operation/cutting method and fling-cut switch circuit Download PDFInfo
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- CN102064549B CN102064549B CN201010199293.2A CN201010199293A CN102064549B CN 102064549 B CN102064549 B CN 102064549B CN 201010199293 A CN201010199293 A CN 201010199293A CN 102064549 B CN102064549 B CN 102064549B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 143
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 43
- 229910052710 silicon Inorganic materials 0.000 claims description 43
- 239000010703 silicon Substances 0.000 claims description 43
- 230000008569 process Effects 0.000 claims description 23
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- 238000007599 discharging Methods 0.000 description 6
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- 150000001875 compounds Chemical class 0.000 description 4
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- 230000002411 adverse Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention proposes a kind of AC capacitor operation/cutting method and fling-cut switch circuit; relay contact two ends are connected in parallel on by diode and resistant series composition relay contact protection circuit; relay contact closure or disconnection is allowed during diode current flow; there is no surge current during the action of contact and do not produce contact sparking; it is withstand voltage suitable with relay fling-cut switch that fling-cut switch bears when disconnecting; can not find the phenomenon that misleads of electronic switch, and switching speed is suitable with thyristor throw-cut.Have that circuit is simple, reliable operation, the with low cost and fireballing feature of switching.
Description
Technical Field
The patent application of the invention relates to an alternating current capacitor switching switch circuit, and belongs to the field of electrical switches.
Background
The alternating current capacitor is widely applied to power factor compensation and power grid filtering of a power grid, and when the alternating current capacitor is used in the power grid, the alternating current capacitor is required to be connected with or disconnected from the power grid at any time according to the actual needs of the power grid, namely, the switching of the alternating current capacitor is realized. At present, a plurality of schemes such as MSC (contactor, circuit breaker) switching, TSC (silicon controlled rectifier) switching, compound switch (silicon controlled rectifier and contactor parallel switch) switching and the like are commonly used. The MSC switching has the defects that huge surge current is possibly generated at the moment when a capacitor is connected with a power grid, the impact is generated on the power grid, and the adverse effect is generated on the service life of the capacitor; although TSC switching has the defects of high cost, large self-heating value and increased harmonic current of a power grid, the TSC switching still can be the best choice for solving the problem of surge current during capacitor switching. The combination switch switching is a scheme of switching circuits combining the advantages of TSC switching and MSC switching, and has the advantages of low cost and small surge current in the switching moment. The compound switch is switched by using a silicon controlled rectifier as a transition electronic switch, but the silicon controlled rectifier can be switched on by mistake when the dv/dt of the anode voltage is high, and the silicon controlled rectifier can be burnt once the silicon controlled rectifier is switched on by mistake. Generally, a resistance-capacitance absorption loop is adopted to reduce dv/dt in use of the silicon controlled rectifier, so that the possibility of error conduction of the silicon controlled rectifier is reduced, and a series resistance-capacitance circuit method cannot be adopted to reduce dv/dt in the case that the silicon controlled rectifier switches an alternating current capacitor, because the series resistance increases the loss of a switching switch. Therefore, misconduction of the silicon controlled rectifier is a difficult problem to overcome in a scheme of TSC switching and combination switch switching, the TSC switching is to select a large-current silicon controlled rectifier to solve the problem that surge current burns the silicon controlled rectifier when the silicon controlled rectifier is misconducted, but the combination switch generally uses the silicon controlled rectifier with smaller rated current, the advantage of low cost of the combination switch is lost due to the use of the silicon controlled rectifier with larger rated current, and the misconduction of the silicon controlled rectifier is one of main reasons for failure of the combination switch. In the composite switch scheme, in order to reduce the false conduction of the silicon controlled rectifier, the silicon controlled rectifier with a higher dv/dt value is generally selected, but the probability of false conduction of the silicon controlled rectifier is only reduced, and the problem cannot be fundamentally solved. In addition, surge current generated by misconduction of the thyristor has great influence on the service life of the alternating current capacitor and the power grid.
In summary, except for the situation requiring frequent and fast switching, a TSC switching scheme is required, and compared with contactor switching, TSC switching and compound switch switching in general use situations do not have any advantages, so that in actual use, a large amount of contactors are used for switching at present.
Disclosure of Invention
The invention provides an alternating current capacitor switching method and a switching switch circuit, which avoid the defects of MSC switching, TSC switching and combination switch switching, surge current and contact ignition are avoided at the moment of switching on and off of the switching switch, the withstand voltage born by the switch when the switch is switched off is equivalent to that of a switching switch of a contactor, and the switching speed is equivalent to that of the TSC switching. The circuit has the characteristics of high reliability, simple circuit, low cost and high switching speed.
In order to achieve the purpose, the invention provides the following technical scheme: before switching, the alternating current capacitor charges the capacitor to a peak value close to the voltage of the power grid through the diode connected in series between the power grid and the alternating current capacitor in a direct current mode, the capacitor is discharged when the alternating current capacitor is switched, when the voltage of the capacitor is slightly lower than the voltage of the power grid, the diode connected in series between the capacitor and the power grid is automatically conducted, and the mechanical contact of the relay connected to two ends of the diode in parallel and connected in series between the capacitor and the power grid is closed during the conduction period of the diode, so that the switching process of the alternating current capacitor is completed.
The switching switch circuit for realizing the switching method of the alternating current capacitor comprises a relay contact protection circuit, an alternating current capacitor discharge circuit, a relay and a single chip microcomputer control module, and is characterized in that: the relay contact protection circuit is formed by connecting a diode and a resistor in series and is connected to two ends of a relay contact in parallel; the alternating current capacitor discharge loop is formed by connecting a silicon controlled rectifier and a resistor in series and is connected to two ends of the switched alternating current capacitor in parallel; the contact of the relay and the switched alternating current capacitor are connected to two ends of a power grid in series; the single chip microcomputer control module provides control signals of an alternating current capacitor discharging loop and a relay.
The relay contact protection circuit of the switching switch circuit of the alternating current capacitor can be formed by connecting a diode, a resistor and an electronic switch in series. The electronic switch can be a one-way thyristor, a two-way thyristor, a power MOS tube, an IGBT, a high-voltage power triode and the like.
The alternating current capacitor discharge loop of the alternating current capacitor switching switch circuit can be formed by connecting a diode, a resistor, an inductor and an electronic switch in series, and the electronic switch can be a one-way thyristor, a two-way thyristor, a power MOS (metal oxide semiconductor) tube, an IGBT (insulated gate bipolar transistor), a high-voltage power triode and the like.
The switching circuit of the alternating current capacitor has the advantages of being fast in switching, free of surge current and relay contact ignition in the switching process, the switching speed of the switch is the same as the switching mode of the TSC, almost no loss of the switch contact is caused when the switching switch works normally, and the service life of the switch contact is greatly prolonged. The condition of switch misconduction can not occur during the switch off period, thereby preventing the capacitor from reducing the service life or being damaged due to the instant huge charging current. The switching switch circuit of the alternating current capacitor is simple in structure, low in cost and high in reliability.
Drawings
FIG. 1 is a schematic circuit diagram 1 of an AC capacitor fling-cut switch circuit of the present invention;
FIG. 2 is a schematic circuit diagram of an AC capacitor fling-cut switch circuit of the present invention 2;
FIG. 3 is a schematic circuit diagram of an AC capacitor fling-cut switch circuit of the present invention 3;
fig. 4 is a schematic diagram of an ac capacitor fling-cut switch circuit of the present invention 4.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention discloses an AC capacitor switching method, which comprises the following steps: before the AC capacitor is switched to be connected to a power grid, the capacitor is charged through a diode connected in series between the capacitor and the power grid, and when the voltage on the capacitor is charged to be close to the peak value of the voltage of the power grid after a plurality of AC cycles, the capacitor finishes switching preparation. The capacitor is first discharged at the beginning of the switching, and when the voltage on the capacitor drops to a little lower than the grid voltage, the diode connected in series between the capacitor and the grid automatically turns on until the grid voltage reaches a peak value, and the diode automatically turns off. And during the conduction period of the diode, the mechanical contacts of the relays connected in parallel at the two ends of the diode are controlled to be closed, and the diode is short-circuited after the mechanical contacts are closed, so that the switching process of the AC capacitor to be connected into the power grid is completed.
The switching method of the alternating current capacitor is essentially different from the so-called zero-crossing switching in the prior art: the zero-crossing switching in the prior art is to conduct the silicon controlled zero-finding voltage point, and the switching method of the invention is to automatically conduct the diode in the discharging process of the capacitor. The zero-crossing switching needs a relatively complex control circuit to ensure that the silicon controlled rectifier is conducted at a zero voltage point, and the switching method of the alternating current capacitor allows millisecond-level errors for controlling the discharge time, and the common circuits with the errors can be easily realized. The switching process of the capacitor can be regarded as that the capacitor is connected into an alternating current power grid as a load by the switching switch, only when the voltage or the current borne by the contact at the moment of switching on the switch is zero, the power consumption borne by the switch contact is the minimum, the contact of the mechanical switch cannot be accurately switched on at the zero power consumption point, and the zero power consumption conduction of the mechanical contact is difficult to realize along with the vibration of the contact in the switching on process of the mechanical contact. The TSC switching and the compound switch switching are realized by triggering the silicon controlled rectifier to be conducted at the point that the anode and the cathode of the silicon controlled rectifier bear the voltage of zero so as to realize zero power consumption switching. The silicon controlled rectifier is relatively easy to be triggered at the zero crossing point, and the accurate control of the silicon controlled rectifier zero crossing point conduction is difficult to realize due to the conduction dead angle of the silicon controlled rectifier and the change of corresponding time parameters. The conduction of the diode only needs the condition that the anode voltage is higher than the cathode voltage, and triggering is not needed, so that the conduction condition of the diode is simpler than that of the silicon controlled rectifier, the conduction speed is higher than that of the silicon controlled rectifier, and the cost of a control circuit is low.
Fig. 1 is a schematic diagram of an ac capacitor fling-cut switch circuit according to the present invention. The invention relates to an AC capacitor switching-on and switching-off circuit which comprises four parts: relay contact protection circuit: a series circuit of a diode D and a resistor R1 connected in parallel at both ends of the relay contact K; discharge circuit of AC capacitor: a series circuit of a thyristor CR and a resistor R2 which are connected in parallel at two ends of the switched AC capacitor C; thirdly, a relay: a contact K of the relay J1 is connected in series between the switched capacitor and the power grid, and the action of the relay is controlled by the single-chip microcomputer control module; fourthly, the singlechip control module: and controlling whether the discharging loop of the alternating current capacitor works and the attraction or disconnection of the relay. The working process of the switching switch circuit of the alternating current capacitor is as follows, after the switching switch circuit and the alternating current capacitor C are connected with a power grid, the alternating current capacitor C is charged to the peak value of the voltage of the power grid through a diode D and a resistor R1, a resistor or a piezoresistor R3 can be connected in parallel at two ends of the switched alternating current capacitor, overvoltage damage of the capacitor caused by excessive accumulation of the charge on the capacitor is prevented, and the switched alternating current capacitor can be used as a capacitor discharge resistor. When the switching switch circuit works, the singlechip control module firstly controls the silicon controlled rectifier CR of the discharge loop to be conducted before the voltage of a power grid reaches a peak value, the alternating current capacitor discharges through the discharge loop of the silicon controlled rectifier CR and the resistor R2, when the voltage on the alternating current capacitor is reduced to a little lower than the instantaneous value of the voltage of the power grid, the diode D is automatically conducted, the singlechip control module simultaneously controls the contact K1 of the relay J1 to be closed after the diode D is conducted, the diode is conducted during the closing period of the relay contact K1, so that the voltage borne by the contact K1 is 0.7V of the conduction voltage of the diode, the current passing through the alternating current capacitor C is small near the peak value of the voltage, the power consumption borne by the contact K1 of the relay J1 at the closing moment is small, and the diode plays a role in protecting the. After a contact K1 of the relay J1 is closed, the diode D and the resistor R1 are in short circuit, the process that the alternating current capacitor is connected into a power grid is completed, in the process that the contact K1 of the relay J1 shakes and does not ignite, the diode D is conducted at any time when the contact shakes and is disconnected, and the contact only bears 0.7V voltage. The process of dropping the alternating-current capacitor from the power grid is simple, the action time of the contact K1 of the relay J1 is controlled by the single-chip microcomputer control module, the forward (conducting) voltage borne by the diode is selected when the contact K1 is disconnected, the diode D is automatically turned off when the voltage peak value is reached after the contact K1 of the relay J1 is disconnected, and the disconnection process of the alternating-current capacitor from the power grid is naturally completed. The opening point of relay contact K1 is selected to be close to the peak of the voltage, and the power consumption experienced when the contact is opened is less. The voltage on the capacitor is still the peak value of the voltage of the power grid after the capacitor is withdrawn, the capacitor does not need to be charged when the capacitor bank is connected to the power grid for the first time, the capacitor can be switched into the power grid at any time, the capacitor can be switched without waiting for the capacitor to be discharged, the switching speed is equivalent to that of TSC switching, and the TSC switching can be completely replaced in some occasions needing quick switching.
At the moment when the alternating current capacitor is connected into a power grid, the charging surge current of the capacitor is too large, and the load of the power grid is adversely affected. The resistor R1 is used for limiting the surge current of the alternating current capacitor when the switching switch is connected to the power grid, the larger the current limiting resistor R1 is, the smaller the surge current of the switching circuit and the alternating current capacitor is when the switching circuit is connected to the power grid is, but the larger the R1 is, the larger the power consumption borne by the relay contact K1 when the relay contact K1 is closed or opened is. R1 can be selected between 0 and 100 Ω, and R1 can be selected according to the surge current resistance of the diode and the surge current resistance of the relay contact K1.
The resistor R2 is used to discharge the capacitor C, and the smaller the resistance of the resistor R2, the faster the capacitor C is discharged, the longer the diode D will have the conducting time, which will give the relay contact K1 a more tolerant closing time, because the relay contact K1 must complete the closing process when the diode is conducting, and the relay contact closing (including the shaking of the contacts) requires a certain time and has a certain error, so it is necessary to have the diode conducting for a longer time. Theoretically, the conduction time of the diode does not exceed 10 milliseconds, but considering the power and the volume of R1, the resistance value of R2 is not suitable to be selected too small, the conduction time of the actual diode does not exceed 5 milliseconds, which puts a higher requirement on a selected relay, the action stable time of a general relay contact is longer than the time, and the relay used with the alternating current capacitor switching switch circuit needs special improvement and is not detailed in the patent application.
In order to solve the problem that the resistor R1 is too small to limit the surge current, and the R1 is too large to bear large power when the relay contact is closed, a power MOS tube can be connected in series in a loop of the diode D and the resistor R1, as shown in FIG. 2. The power MOS transistor T1 has the following functions: the charging current of the alternating current capacitor is controlled by controlling the conduction time of the MOS tube in the moment that the switching switch circuit is connected to a power grid, the MOS tube T1 is always conducted to ensure that the diode D is also always conducted in the process of closing and opening the contact K1 of the relay J1, and the conduction signal of the MOS tube T1 is provided by the singlechip control module. The power MOS tube can also be replaced by the electronic switch such as silicon controlled rectifier, IGBT or high-voltage triode, so the relay contact protection circuit can be formed by connecting a diode, a resistor and the electronic switch in series, and the electronic switch can be the silicon controlled rectifier, the power MOS tube, the IGBT, the high-voltage power triode and the like.
The thyristor CR in the discharge loop formed by the thyristors CR and R2 plays a role of a discharge switch, the thyristor can be replaced by a power MOS tube T2 as shown in figure 2, and the thyristor can also be replaced by a high-voltage triode or an IGBT. In addition, an inductance coil L can be added in the discharge loop in series to reduce the possibility of misconduction of the controlled silicon. Therefore, the discharge loop can be formed by connecting a diode, a resistor, an inductor and an electronic switch in series, and the electronic switch can be a unidirectional silicon controlled rectifier, a bidirectional silicon controlled rectifier, a power MOS tube, an IGBT, a high-voltage power triode and the like. If the situation that frequent switching is not needed, after the capacitor is withdrawn, the residual voltage on the capacitor can be completely discharged through T2 and R2, and before the capacitor needs to be switched again, the capacitor is charged through D, T1 and R1, and the switching process is started after the capacitor is charged to the peak value of the voltage of the power grid. .
The relay in the switching switch circuit of the alternating current capacitor can be a common direct current electromagnetic relay, a magnetic latching relay or a mechanical self-locking relay. The circuit power consumption after the relay contact is closed can be reduced by using a magnetic latching relay or a mechanical latching relay. The relay used by matching with the switching switch circuit of the alternating current capacitor can meet the requirements of short contact jitter time and stable contact action time.
In order to solve the problem that when the value of R1 is large, the power of the relay is large when the relay contact is closed, the relay contact may be connected in parallel to two ends of the current limiting resistor R1, as shown in fig. 3. The relay J2 is controlled by the single-chip microcomputer control module, when the alternating current capacitor is connected with a power grid and is prepared for switching, a contact K2 of the relay J2 is not closed, and the current limiting resistor R2 can limit the charging current of the capacitor to the maximum extent. After several alternating current cycles, the capacitor is charged to the peak value of the grid voltage, the contact of the relay J2 can be closed all the time, the current limiting resistor R2 is short-circuited, namely the diode D is directly connected in parallel with the contact K1 of the relay J1, and the load of the contact can be reduced to the maximum extent when the contact K1 is closed and opened. In this embodiment, the value of the current limiting resistor R1 can reach more than 1K Ω, the charging current can be greatly reduced when the switching switch and the capacitor are connected to the power grid, and when a plurality of capacitors are connected to the power grid, the influence of the charging surge current on the bus switch and the power grid can be ignored. The relay has the advantages of low cost, high reliability and strong overcurrent capacity, and the relay short-circuit current-limiting resistor R1 has obvious advantages compared with other schemes.
Fig. 4 is a switch circuit unit of the ac capacitor switching switch of the present invention, which is mainly composed of a diode D, a triac BCR, a current-limiting resistor short-circuit relay J2, and a main relay J1, and a complete ac capacitor switching switch circuit is completed by adding a single-chip microcomputer control module. The coil of relay J1 has the dual function of pulling the relay in and discharging the capacitor when the thyristor is on. The switching switch circuit of the alternating current capacitor is small in size, does not have a heating element, and the whole switch can be assembled with the alternating current capacitor to form the alternating current capacitor with the switching switch, so that the switching switch circuit is greatly convenient to install and use.
The switching circuit of the alternating current capacitor can be applied to switching of high-voltage alternating current capacitors of more than thousands of volts, only a diode D in a contact protection circuit needs to be replaced by a series connection of a plurality of diodes, even if ten diodes are connected in series, the voltage borne by a contact when the contact is closed is only 7V.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
The switching switch circuit of the alternating current capacitor enables the diode to be automatically conducted through the discharging process of the discharging loop, and completes the closing and opening processes of the relay contact in the conducting period of the diode, and the diode plays a role in protecting the mechanical contact in the closing and opening processes of the contact, so that the switching switch circuit has the characteristics of ingenious, simple and easy control. Because the switching switch circuit of the alternating current capacitor does not use the silicon controlled rectifier as the electronic switch, the damage of the silicon controlled rectifier and the capacitor caused by instant huge inrush current of the alternating current capacitor due to the misconduction of the silicon controlled rectifier is avoided. In the switching process, surge current is not generated in the process of conducting the diode, which is not achieved when the silicon controlled rectifier in the composite switch or TSC switching scheme is conducted.
Claims (4)
1. A switching method of an alternating current capacitor is characterized in that: before switching, an alternating current capacitor charges the capacitor to the peak value of the voltage of the power grid through a diode connected in series between the power grid and the alternating current capacitor in a direct current manner, the capacitor is discharged when the alternating current capacitor is switched, when the voltage of the capacitor is lower than the voltage of the power grid, the diode connected in series between the capacitor and the power grid is automatically conducted, a relay mechanical contact which is connected to two ends of the diode in parallel and connected in series between the capacitor and the power grid is closed during the conduction period of the diode, and the diode is short-circuited after the relay mechanical contact is closed, so that the switching process of the alternating current capacitor is;
the action time of the relay contact is controlled to select the forward conduction voltage borne by the diode when the contact is disconnected, and the diode is automatically turned off when the voltage reaches the peak value after the relay contact is disconnected, so that the disconnection process of the alternating-current capacitor from the power grid is completed.
2. The utility model provides an alternating current capacitor on-off switch circuit, by relay contact protection circuit, alternating current capacitor discharge circuit, relay and singlechip control module constitution, its characterized in that: the relay contact protection circuit is formed by connecting a diode and a resistor in series and is connected to two ends of a relay contact in parallel; the alternating current capacitor discharge loop is formed by connecting a silicon controlled rectifier and a resistor in series and is connected to two ends of the switched alternating current capacitor in parallel; the contact of the relay and the switched alternating current capacitor are connected to two ends of a power grid in series; the single chip microcomputer control module provides control signals of an alternating current capacitor discharge circuit and a relay; wherein,
before switching, an alternating current capacitor charges the capacitor to the peak value of the voltage of the power grid through a diode connected in series between the power grid and the alternating current capacitor in a direct current manner, the capacitor is discharged when the alternating current capacitor is switched, when the voltage of the capacitor is lower than the voltage of the power grid, the diode connected in series between the capacitor and the power grid is automatically conducted, a relay mechanical contact which is connected to two ends of the diode in parallel and connected in series between the capacitor and the power grid is closed during the conduction period of the diode, and the diode is short-circuited after the relay mechanical contact is closed, so that the switching process of the alternating current capacitor is; the action time of the relay contact is controlled to select the forward conduction voltage borne by the diode when the contact is disconnected, and the diode is automatically turned off when the voltage reaches the peak value after the relay contact is disconnected, so that the disconnection process of the alternating-current capacitor from the power grid is completed.
3. An ac capacitor fling-cut switch circuit as claimed in claim 2 wherein the relay contact protection circuit is a series connection of a diode, a resistor and an electronic switch; the electronic switch is a one-way silicon controlled rectifier, a two-way silicon controlled rectifier, a power MOS tube, an IGBT or a high-voltage power triode.
4. An ac capacitor switching circuit as claimed in claim 2, wherein the ac capacitor discharge circuit is a series connection of a diode, a resistor, an inductor and an electronic switch, and the electronic switch is a one-way thyristor, a two-way thyristor, a power MOS transistor, an IGBT or a high voltage power transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010199293.2A CN102064549B (en) | 2009-11-11 | 2010-06-12 | AC capacitor operation/cutting method and fling-cut switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920179929X | 2009-11-11 | ||
| CN200920179929 | 2009-11-11 | ||
| CN200920179929.X | 2009-11-11 | ||
| CN201010199293.2A CN102064549B (en) | 2009-11-11 | 2010-06-12 | AC capacitor operation/cutting method and fling-cut switch circuit |
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| CN102064549A CN102064549A (en) | 2011-05-18 |
| CN102064549B true CN102064549B (en) | 2016-03-16 |
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| CN102420431A (en) * | 2011-11-28 | 2012-04-18 | 吉林市龙华电力技术有限公司 | Low-voltage phase control switch for mechanically switching capacitor |
| CN104300955A (en) * | 2014-10-15 | 2015-01-21 | 南京诺联配电科技有限公司 | Switching circuit used for switching capacitor and switching control method |
| CN111711202A (en) * | 2020-06-30 | 2020-09-25 | 合肥众甫工业技术有限公司 | Reactive compensation capacitor switching device based on three-phase four-wire system power grid |
| CN112542348A (en) * | 2021-01-25 | 2021-03-23 | 沈阳益峰电器有限责任公司 | High-voltage alternating-current switching combination switch capable of being switched on and off completely at zero voltage |
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