CN205509512U - Thrown cut device is mended altogether to low -voltage capacitor 's three -phase - Google Patents
Thrown cut device is mended altogether to low -voltage capacitor 's three -phase Download PDFInfo
- Publication number
- CN205509512U CN205509512U CN201620260146.4U CN201620260146U CN205509512U CN 205509512 U CN205509512 U CN 205509512U CN 201620260146 U CN201620260146 U CN 201620260146U CN 205509512 U CN205509512 U CN 205509512U
- Authority
- CN
- China
- Prior art keywords
- switch
- switching
- electronic switch
- signal
- switching controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 52
- 230000000295 complement effect Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 3
- 229910052710 silicon Inorganic materials 0.000 claims 3
- 239000010703 silicon Substances 0.000 claims 3
- 238000000034 method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
The utility model discloses a thrown cut device is mended altogether to low -voltage capacitor's three -phase for thyristor consumption in solving prior art is big, dispels the heat difficult scheduling problem and invents. Including switching controller, three on -off switch, on -off switch constitute by electromagnetic switch and electronic switch are parallelly connected, when dropping into, the switching controller makes electronic switch switch on the back, output signal electromagnetic switch switches on so that electronic switch by the short circuit to gone electronic switch's control signal to make electronic switch turn -off at electronic switch by the short circuit recession, work by electromagnetic switch always, during the excision, switching controller output signal makes electronic switch switch on to with the electromagnetic switch disconnection after electronic switch switches on, and drop back in the electromagnetic switch disconnection and remove electronic switch's control signal, accomplished electric capacity and followed the excision in the phase line. Whole absorbed in -process keeps by magnetic field that its leads to, disconnected state, and magnetic latching relay's solenoid does not need the electric current, so the consumption is very low.
Description
Technical Field
The utility model relates to an electric power system's power transmission and distribution technical field, in particular to switching device of low-voltage capacitor.
Background
With the wide application of a large number of inductive, impact and nonlinear low-voltage loads in a power grid, a large number of inductive reactive powers are generated in a low-voltage distribution network, so that voltage drop of a power grid line is caused, electric energy loss is increased, and the electric energy quality of the power grid is reduced. In order to reduce reactive loss in a line and improve the power quality of a power grid, capacitive reactive compensation is ideally performed on site, and a common method is to switch a low-voltage capacitor for capacitive reactive compensation.
At present, the structures for the low-voltage capacitor fling-cut switch mainly comprise two types, one type is an alternating current contactor fling-cut switch, and the other type is a thyristor fling-cut switch. The switching switch of the alternating current contactor can generate large inrush current and overvoltage when the low-voltage capacitor is put into or cut off, the service life of the low-voltage capacitor and the service life of the alternating current contactor can be reduced, and the low-voltage capacitor and the alternating current contactor can be damaged. The AC contactor switches the low-voltage capacitor, has high maintenance cost and is not suitable for frequent operation. The thyristor switching switch realizes zero-crossing switching of the low-voltage capacitor, solves the problem of inrush current and overvoltage in the switching process of the low-voltage capacitor, has large power consumption and difficult heat dissipation of the thyristor, needs an auxiliary group radiator, and is easy to generate harmonic waves when the low-voltage capacitor operates.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the shortcoming that prior art exists, provide a switching device of low voltage capacitor, this switching device has zero passage switching low voltage capacitor's function to switching device operation low power dissipation can not produce the harmonic and pollute.
In order to achieve the purpose, the three-phase compensation switching device of the low-voltage capacitor comprises a switching controller and three switching switches, wherein,
The switching controller is used for collecting parameters of any phase line and sending a switching signal to the switching switch according to a parameter set value;
each switching switch is used for simultaneously switching the compensation capacitor into the line or cutting the compensation capacitor from the line; the switching switch is formed by connecting an electromagnetic switch and an electronic switch in parallel;
wherein,
when the switching controller sends a switching signal, the switching signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted, so that the capacitor is switched on; the switching controller outputs a signal to switch on the electromagnetic switch after the electronic switch is switched on so as to enable the electronic switch to be short-circuited; the switching controller removes the control signal of the electronic switch after the electronic switch is short-circuited, and the electronic switch is turned off; the switching controller controls the electromagnetic switch to work all the time;
when the switching controller sends out a cut-off signal, the cut-off signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted; the switching controller outputs a signal to switch off the electromagnetic switch after the electronic switch is switched on; the switching controller removes the control signal of the electronic switch after the electromagnetic switch is switched off, and the electronic switch is switched off to finish the removal of the capacitor from the phase line.
Preferably, the electronic switch consists of a zero-crossing trigger and two thyristors connected in reverse parallel, and the zero-crossing trigger triggers the thyristors to conduct when the thyristor terminal voltage crosses zero; the switching controller output signal is connected with the input end of the zero-crossing trigger, and the output end of the zero-crossing trigger outputs a control signal to the control end of the inverse parallel thyristor.
Preferably, the electromagnetic switch is a magnetic latching relay.
Preferably, the zero-cross trigger at least comprises an optical isolation zero-cross thyristor driver, and the optical isolation zero-cross thyristor driver is MOC 3081.
Preferably, the parameters of the line include the network voltage, the load current and/or the work compensation branch current.
In order to achieve the above purpose, the switching device of the low-voltage capacitor of the utility model comprises a switching controller and a switching switch, wherein,
the switching controller is used for collecting the parameters of the line and sending a switching-in or switching-off signal to the switching switch according to the parameter set value;
the switching switch is used for switching the compensation capacitor into a circuit or cutting the compensation capacitor from the circuit; the switching switch is formed by connecting an electromagnetic switch and an electronic switch in parallel;
Wherein,
when the switching controller sends a switching signal, the switching signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted, so that the capacitor is switched on; the switching controller outputs a signal to switch on the electromagnetic switch after the electronic switch is switched on so as to enable the electronic switch to be short-circuited; the switching controller removes the control signal of the electronic switch after the electronic switch is short-circuited, and the electronic switch is turned off; the switching controller controls the electromagnetic switch to work all the time;
when the switching controller sends out a cut-off signal, the cut-off signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted; the switching controller outputs a signal to switch off the electromagnetic switch after the electronic switch is switched on; the switching controller removes the control signal of the electronic switch after the electromagnetic switch is switched off, and the electronic switch is switched off to finish the removal of the capacitor from the phase line.
Preferably, the electronic switch consists of a zero-crossing trigger and two thyristors connected in reverse parallel, and the zero-crossing trigger triggers the thyristors to conduct when the thyristor terminal voltage crosses zero; the switching controller output signal is connected with the input end of the zero-crossing trigger, and the output end of the zero-crossing trigger outputs a control signal to the control end of the inverse parallel thyristor.
Preferably, the electromagnetic switch is a magnetic latching relay.
The utility model discloses a fling-cut switch comprises thyristor and magnetic latching relay parallelly connected, and when the low-voltage capacitor was thrown into, the switching controller control thyristor switched on earlier, and the thyristor switches on back magnetic latching relay and then switches on. After the magnetic latching relay is switched on, the thyristor is short-circuited, the switching controller disconnects the thyristor, and then the magnetic latching relay works all the time. When the low-voltage capacitor is cut off, the switching controller controls the thyristor to be firstly switched on, then the switching controller switches off the magnetic latching relay, and after the magnetic latching relay is completely switched off, the thyristor is switched off. The magnetic latching relay only needs energy to drive when in action, and keeps the on-off state by a magnetic field when not in action, and a coil of the magnetic latching relay does not need current, so that the power consumption is very low.
Drawings
Fig. 1 is a block diagram of a low voltage capacitor switching device.
FIG. 2 is a schematic diagram of the three-phase compensation switching device of the low-voltage capacitor of the present invention;
FIG. 3 is a three-phase distribution schematic diagram of the low-voltage capacitor switching device
Fig. 4 is a circuit diagram of a zero-crossing flip-flop in the embodiment shown in fig. 2.
Detailed Description
The utility model provides a switching device of low-voltage capacitor, it is right below to combine the figure description and embodiment the utility model discloses do further explanation.
Fig. 1 is the utility model discloses a switching low voltage capacitor device block diagram, it is shown by fig. 1, the switching device of low voltage capacitor can carry out multiunit three-phase mends altogether and multiunit three-phase divides the switching of mending, and the three-phase is mended altogether and is all constituted by condenser and series reactor with three-phase, and the three-phase is mended altogether and can be linked into star configuration or triangle-shaped structure, and the three-phase divides to mend and links into Y0 shape structure. The switching controller collects power grid voltage, load current, three-phase common compensation and three-phase sub-compensation current signals, parameters such as reactive power and power factor of a power grid are obtained through analysis, calculation and processing of a CPU, the reactive power required by the power grid is calculated according to set parameter values, and the switching controller controls the action of the switching switch, so that switching of a capacitor is controlled, and three-phase common compensation and three-phase sub-compensation of the power grid are realized. And the switching controller analyzes and processes the received data, detects the state of the device, and performs protection control if a fault occurs.
Example 1
Fig. 2 is the utility model discloses a low voltage capacitor three-phase mends switching device's schematic diagram altogether, is shown by fig. 2, and when the device was carrying out the three-phase and is mended altogether and throwing into, switching controller output signal switched on the three-phase zero passage trigger, and the three-phase zero passage trigger switches on anti-parallel thyristor T1, T2 and T3 earlier, and the thyristor switches on back switching controller output signal and switches on magnetic latching relay K. After the magnetic latching relay K is switched on, the thyristor is short-circuited, the switching controller removes the control signal of the three-phase zero-crossing trigger, the anti-parallel thyristors T1, T2 and T3 are switched off, and then the magnetic latching relay K works all the time. When three phases are removed in a complementary mode, the switching controller outputs signals to conduct the three-phase zero-crossing trigger, the three-phase zero-crossing trigger conducts the anti-parallel thyristors T1, T2 and T3 firstly, then the switching controller outputs signals to disconnect the magnetic latching relay K, after the magnetic latching relay K is disconnected completely, the switching controller removes control signals of the three-phase zero-crossing trigger, and the anti-parallel thyristors T1, T2 and T3 are disconnected.
Example 2
Fig. 3 is the utility model discloses a switching capacitor device's the schematic diagram that is applied to the three-phase and divides the condition of mending, is shown by fig. 3, and the device is when carrying out the throwing of three-phase branch mending, takes A looks as an example, and switching controller output signal switches on A looks zero cross trigger, and A looks zero cross trigger switches on anti-parallel thyristor TA earlier, and anti-parallel thyristor TA switches on back switching controller output signal and switches on magnetic latching relay K1. After the magnetic latching relay K1 is switched on, the anti-parallel thyristor TA is short-circuited, the switching controller removes the control signal of the A-phase zero-crossing trigger, the anti-parallel thyristor TA is switched off, and then the magnetic latching relay K1 works all the time. When the three-phase compensation is cut off, the switching controller outputs signals to conduct the A-phase zero-crossing trigger, the A-phase zero-crossing trigger conducts the anti-parallel thyristor TA firstly, then the switching controller outputs signals to disconnect the magnetic latching relay K1, and after the magnetic latching relay K1 is completely disconnected, the switching controller removes the control signals of the A-phase zero-crossing trigger, and the anti-parallel thyristor TA is switched off. The three-phase complementary switching of the phase B and the phase C is similar to that of the phase A, and the description is omitted here.
Fig. 4 is a circuit diagram of the zero-cross flip-flop in the embodiment shown in fig. 2, a core chip of the zero-cross flip-flop is an MOC3081 device, and the MOC3081 is a novel photoelectric coupling device produced by MOTOROLA corporation, and it can use a low dc voltage and a small dc current to control a high ac voltage and a large ac current.
As shown in fig. 4, R1 is a current limiting resistor, a light emitting diode LED is used for zero-cross triggering indication, the current input by the R1 current limiting LED is about 15mA, and R2 is a current limiting resistor for triggering the power triac, and the value thereof is determined by the ac grid voltage peak value and the allowable repetitive rush current peak value of the trigger output terminal. R3 is the gate resistance of the thyristor, when the sensitivity of the control cabinet is higher, the gate resistance is also higher, and the R3 can improve the anti-interference capability. R4 is also the gate resistance of the thyristor, and diodes D1 and D2 are optionally used as IN 4001. When a direct-current 24V voltage signal is added to the control end, the driving current of the MOC3081 flows through the chip through the driving resistor R1 and the LED, and at the moment, the infrared light-emitting diode in the chip emits a light signal.
The zero-crossing detection circuit in the chip starts working, when the zero-crossing detection circuit detects the zero-crossing signals of the terminal voltages of the pins 4 and 6 of the chip, the bidirectional thyristor in the chip is conducted, and the current flowing through the bidirectional thyristor triggers the anti-parallel thyristor to be conducted.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (8)
1. A three-phase compensation switching device of a low-voltage capacitor is characterized in that the switching device comprises a switching controller and three switching switches, wherein,
the switching controller is used for collecting parameters of any phase line and sending a switching signal to the switching switch according to a parameter set value;
each switching switch is used for simultaneously switching the compensation capacitor into the line or cutting the compensation capacitor from the line; the switching switch is formed by connecting an electromagnetic switch and an electronic switch in parallel;
wherein,
when the switching controller sends a switching signal, the switching signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted, so that the capacitor is switched on; the switching controller outputs a signal to switch on the electromagnetic switch after the electronic switch is switched on so as to enable the electronic switch to be short-circuited; the switching controller removes the control signal of the electronic switch after the electronic switch is short-circuited, and the electronic switch is turned off; the switching controller controls the electromagnetic switch to work all the time;
when the switching controller sends out a cut-off signal, the cut-off signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted; the switching controller outputs a signal to switch off the electromagnetic switch after the electronic switch is switched on; the switching controller removes the control signal of the electronic switch after the electromagnetic switch is switched off, and the electronic switch is switched off to finish the removal of the capacitor from the phase line.
2. The three-phase compensation switching device of the low-voltage capacitor as claimed in claim 1, wherein the electronic switch is composed of a zero-crossing trigger and two thyristors connected in reverse parallel, the zero-crossing trigger triggers the thyristors to conduct when the thyristor terminal voltages cross zero; the switching controller output signal is connected with the input end of the zero-crossing trigger, and the output end of the zero-crossing trigger outputs a control signal to the control end of the inverse parallel thyristor.
3. The three-phase complementary switching device of the low-voltage capacitor as claimed in claim 1, wherein the electromagnetic switch is a magnetic latching relay.
4. The three-phase complementary switching device of the low-voltage capacitor as claimed in claim 2, wherein the zero-cross trigger includes at least one optoisolated zero-cross thyristor driver, and the optoisolated zero-cross thyristor driver is MOC 3081;
the optical isolation zero-crossing bidirectional controllable silicon driver is provided with two input ends and two output ends; a current-limiting resistor is arranged at one input end of the optical isolation zero-crossing silicon controlled driver; and a threshold resistor is arranged at the output end of the negative electrode of the optical isolation zero-crossing silicon controlled driver.
5. The three-phase complementary switching device of the low-voltage capacitor as claimed in claim 1, wherein the parameters of the line include the grid voltage, the load current and the reactive compensation branch current.
6. A switching device of a low-voltage capacitor is characterized in that the switching device comprises a switching controller and a switching switch, wherein,
the switching controller is used for collecting the parameters of the line and sending a switching-in or switching-off signal to the switching switch according to the parameter set value;
the switching switch is used for switching the compensation capacitor into a circuit or cutting the compensation capacitor from the circuit; the switching switch is formed by connecting an electromagnetic switch and an electronic switch in parallel;
wherein,
when the switching controller sends a switching signal, the switching signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted, so that the capacitor is switched on; the switching controller outputs a signal to switch on the electromagnetic switch after the electronic switch is switched on so as to enable the electronic switch to be short-circuited; the switching controller removes the control signal of the electronic switch after the electronic switch is short-circuited, and the electronic switch is turned off; the switching controller controls the electromagnetic switch to work all the time;
when the switching controller sends out a cut-off signal, the cut-off signal comprises: the switching controller outputs a signal to the electronic switch to enable the electronic switch to be conducted; the switching controller outputs a signal to switch off the electromagnetic switch after the electronic switch is switched on; the switching controller removes the control signal of the electronic switch after the electromagnetic switch is switched off, and the electronic switch is switched off to finish the removal of the capacitor from the phase line.
7. The switching device for low-voltage capacitors according to claim 6, wherein the electronic switch is composed of a zero-crossing trigger and two thyristors connected in inverse parallel, the zero-crossing trigger triggers the thyristors to conduct when the thyristor terminal voltages cross zero; the switching controller output signal is connected with the input end of the zero-crossing trigger, and the output end of the zero-crossing trigger outputs a control signal to the control end of the inverse parallel thyristor.
8. The switching device for low-voltage capacitors as claimed in claim 6, wherein the electromagnetic switch is a magnetic latching relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620260146.4U CN205509512U (en) | 2016-03-29 | 2016-03-29 | Thrown cut device is mended altogether to low -voltage capacitor 's three -phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620260146.4U CN205509512U (en) | 2016-03-29 | 2016-03-29 | Thrown cut device is mended altogether to low -voltage capacitor 's three -phase |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205509512U true CN205509512U (en) | 2016-08-24 |
Family
ID=56734653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620260146.4U Active CN205509512U (en) | 2016-03-29 | 2016-03-29 | Thrown cut device is mended altogether to low -voltage capacitor 's three -phase |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205509512U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711869A (en) * | 2018-06-15 | 2018-10-26 | 东北农业大学 | A kind of reactive power compensation device |
-
2016
- 2016-03-29 CN CN201620260146.4U patent/CN205509512U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711869A (en) * | 2018-06-15 | 2018-10-26 | 东北农业大学 | A kind of reactive power compensation device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104882891B (en) | Low-voltage distribution voltage adjusting device | |
| CN104953806B (en) | Cascaseded power cell high-voltage frequency converter idle shunting device and its control method | |
| CN108092253B (en) | Capacitive hybrid direct-current circuit breaker for direct-current power grid and control method thereof | |
| CN1756021A (en) | A kind of short-circuit fault current limiter | |
| CN101071163B (en) | Current converter test circuit | |
| CN205509511U (en) | Low -voltage capacitor 's three -phase divides mends thrown cut device | |
| CN112103925A (en) | Multi-port hybrid direct-current circuit breaker and control method | |
| CN105470930A (en) | Radar intelligent power distribution system | |
| CN205509512U (en) | Thrown cut device is mended altogether to low -voltage capacitor 's three -phase | |
| CN205212438U (en) | High -efficient uncompensated on -off switch | |
| CN103023044B (en) | Combination switch with intelligent zero-crossing switching function | |
| CN102386800A (en) | Low-voltage heavy-current high-power pulse power supply | |
| CN207283168U (en) | A kind of electric load commutation circuit for electrical zero interruption | |
| CN105223499A (en) | The test method that flexible DC power transmission engineering voltage source converter valve IGBT excess current turns off | |
| CN108111028A (en) | A kind of converter plant of electric railway ground flexible auto-passing neutral section system | |
| CN105515476B (en) | The device and method for improving brush-less electrically exciting Shaft-Generator short circuit overload capacity | |
| CN112379153B (en) | Direct current oscillation detection circuit, direct current arc detection circuit and inverter | |
| CN210167993U (en) | Contactless crane motor controller with fault monitoring function | |
| CN101826826A (en) | Intelligent motor control cabinet | |
| CN204576130U (en) | Contactless contactor | |
| CN113852056A (en) | Economical direct current breaker with pre-current limiting function and control method thereof | |
| CN107453359A (en) | A kind of electric load commutation circuit for zero interruption of powering | |
| CN114156841A (en) | Novel disconnected commutation loop topological structure of heavy current forced commutation | |
| CN201937480U (en) | Single-phase full-control rectifying and current-limiting device | |
| CN101694967B (en) | Alternating-current brushless voltage regulating and stabilizing digital power-supply unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |