CN217590272U - Reactive power compensation circuit - Google Patents
Reactive power compensation circuit Download PDFInfo
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- CN217590272U CN217590272U CN202221602770.XU CN202221602770U CN217590272U CN 217590272 U CN217590272 U CN 217590272U CN 202221602770 U CN202221602770 U CN 202221602770U CN 217590272 U CN217590272 U CN 217590272U
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Abstract
The application provides a reactive power compensation circuit, which comprises a static reactive generator, a man-machine interface, a busbar and a capacitance reactive power compensation circuit; the static var generator is in signal connection with the man-machine interface; each phase of wire of the busbar is connected with the primary side of a second current transformer in series, and the secondary side of the second current transformer is electrically connected with the current sampling end of the static var generator; the three-phase voltage output end of the busbar is electrically connected with the static var generator, the capacitance reactive compensation circuit and the voltage input end of the inductive load; a first phase voltage output end of the busbar is electrically connected with a high voltage end of a transformer, and a low voltage end of the transformer is electrically connected with a voltage input end of the man-machine interface; and the static var generator controls whether the coil of the contactor is conducted or not so as to further control whether the contact in the corresponding electric capacitance reactive compensation circuit is conducted or not. Therefore, the technical scheme of the application not only reduces the cost of the reactive power compensation circuit, but also improves the working efficiency of the reactive power compensation circuit.
Description
Technical Field
The application relates to the technical field of power compensation circuits, in particular to a reactive power compensation circuit.
Background
In the process of producing trichloroethylene and tetrachloroethylene, inductive loads such as a motor and the like are required to be used, and other production equipment is driven to operate by the motor. These inductive loads cause losses to the circuit, resulting in increased reactive power in the circuit, increased losses, and a reduced power factor. Therefore, in order to reduce the loss and improve the power factor, a reactive power compensation circuit can be added in the circuit to improve the power factor and reduce the loss.
At present, reactive power compensation is generally realized by associating a plurality of static var generators in a circuit, but the static var generators are high in price, so that the reactive power compensation cost is high, the structure of the static var generator is complex, and when the static var generator fails, the maintenance is difficult, so that the working efficiency of a reactive power compensation circuit is low.
SUMMERY OF THE UTILITY MODEL
The present application provides a reactive power compensation circuit to solve the above problems in the background art.
In a first aspect, the application provides a reactive power compensation circuit, which comprises a static reactive power generator, a human-computer interface, a busbar, a transformer, an inductive load, a capacitive reactive power compensation circuit and three second current transformers;
the busbar comprises a three-phase voltage output end;
the static var generator comprises a three-phase current sampling end;
the static var generator is in signal connection with the man-machine interface;
each phase of wire of the busbar is connected with a primary side of a second current transformer in series, and a secondary side of the second current transformer is electrically connected with a phase of current sampling end of the static var generator; the three-phase voltage output end of the busbar is electrically connected with the static reactive power generator, the capacitance reactive power compensation circuit and the voltage input end of the inductive load, and the static reactive power generator, the capacitance reactive power compensation circuit and the inductive load are connected in parallel;
a first phase voltage output end of the busbar is electrically connected with a high voltage end of a transformer, a low voltage end of the transformer is electrically connected with a voltage input end of the man-machine interface, and the first phase voltage output end is any one of three-phase voltage output ends;
the static var generator is provided with a controller and a plurality of switches connected in parallel, the controller is in signal connection with the three-phase current sampling end, the controller is mechanically connected with the plurality of switches connected in parallel, each switch is connected with a coil of a contactor in series, and the coil of each contactor is electrically connected with a zero line;
a second phase voltage output end of the busbar is electrically connected with the voltage input ends of the switches which are connected in parallel, and the second phase voltage output end is any one-phase voltage output end in the three-phase voltage output ends;
the capacitance reactive compensation circuit comprises a plurality of self-healing capacitors, each self-healing capacitor comprises a three-phase electric connection end, and each phase of electric connection end is provided with a first contact of the series contactor.
Optionally, a third phase voltage output end of the busbar is electrically connected with second contacts of a plurality of contactors connected in parallel, each second contact is connected with an indicator lamp in series, and an output end of the indicator lamp is electrically connected with the zero line.
Optionally, a first fuse is electrically connected between the first phase voltage output end and the high-voltage end of the transformer, the third phase voltage output end and the first phase voltage output end are the same phase voltage output end, and the input end of the second contact is electrically connected to the output end of the first fuse.
Optionally, a first circuit breaker is connected in series to the three-phase power line of the busbar.
Optionally, the capacitance reactive compensation circuit further includes a second circuit breaker electrically connected between the first contact of the contactor and the three-phase voltage output end of the busbar.
Optionally, the capacitive reactive compensation circuit comprises three first current transformers, the first current transformers being electrically connected between the second circuit breaker and the first contacts.
Optionally, the capacitance reactive compensation circuit further comprises an arrester, an input end of the arrester is electrically connected with an output end of the current transformer, and an output end of the arrester is electrically connected with a ground wire.
Optionally, the reactive capacitance compensation circuit further comprises a plurality of second fuses, each second fuse being electrically connected between one first current transformer and one first contact.
As can be seen from the above, the reactive power compensation circuit provided in the embodiment of the present application includes a static var generator and a capacitance reactive compensation circuit, so that power compensation for the circuit is realized through the mutual cooperation of the static var generator and the capacitance reactive compensation circuit. The capacitor is low in price, and when the capacitor in the compensation circuit breaks down, a worker can replace the new capacitor at any time, and the compensation circuit can continue to perform power compensation after replacement, so that the working efficiency of the compensation circuit is improved to a certain extent; compared with the prior art, the reactive power compensation circuit only carries out power compensation on the circuit through the static var generator, and the reactive power compensation circuit provided by the embodiment of the application not only reduces the cost of the reactive power compensation circuit, but also improves the working efficiency of the reactive power compensation circuit.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a reactive power compensation circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a static var generator according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a human-machine interface according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating electrical connections of an indicator light according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a busbar according to an embodiment of the present disclosure;
fig. 6 is an electrical connection diagram of a second current transformer according to an embodiment of the present application;
fig. 7 is an electrical connection diagram of a first current transformer according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a reactive capacitance compensation circuit according to an embodiment of the present disclosure.
In the figure: the circuit breaker comprises a first circuit breaker 1QF, a first current transformer 1TA, a second circuit breaker 2QF, a second current transformer 2TA, a static var generator 101, a controller 102, a switch 103, a coil 104, a current sampling end 105, a man-machine interface 201, a transformer 401, a second contact 402, a first contact 603, a self-healing capacitor C, a lightning arrester F, an indicator light HW, a first fuse FU1 and a second fuse FU2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present application, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. In addition, it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1-8 are reactive power compensation circuits shown according to embodiments of the present application. As shown in fig. 1 to 8, the reactive power compensation circuit includes a static var generator 101, a man-machine interface 201, a busbar, a transformer 401, an inductive load, a capacitive reactive compensation circuit, and three second current transformers 2TA.
The busbar comprises a three-phase voltage output end.
The static var generator 101 includes a three-phase current sampling terminal 105.
The static var generator 101 is in signal connection with a man-machine interface 201.
Each phase of wire of the busbar is connected in series with a primary side of a second current transformer 2TA, and a secondary side of the second current transformer 2TA is electrically connected with a phase current sampling end 105 of the static var generator 101.
The three-phase voltage output end of the busbar is electrically connected with the static var generator 101, the capacitance reactive compensation circuit and the voltage input end of the inductive load, and the static var generator 101, the capacitance reactive compensation circuit and the inductive load are connected in parallel.
The first phase voltage output end of the busbar is electrically connected with the high voltage end of the transformer 401, the low voltage end of the transformer 401 is electrically connected with the voltage input end of the man-machine interface 201, and the first phase voltage output end is any one of the three-phase voltage output ends.
The static var generator 101 is provided with a controller 102 and a plurality of switches 103 connected in parallel, the controller 102 is in signal connection with a three-phase current sampling end 105, the controller 102 is mechanically connected with the plurality of switches 103 connected in parallel, each switch 103 is connected with a coil 104 of a contactor in series, and the coil 104 of each contactor is electrically connected with a zero line.
The second phase voltage output end of the busbar is electrically connected with the voltage input ends of the switches 103 which are connected in parallel, wherein the second phase voltage output end is any one phase voltage output end of the three-phase voltage output ends.
The capacitance reactive compensation circuit comprises a plurality of self-healing capacitors C, each self-healing capacitor C comprises a three-phase electric connection end, and each phase electric connection end is provided with a first contact 603 of a series contactor.
Each phase current sampling end comprises 2 current sampling ends, so that the three-phase current sampling ends comprise 6 current sampling ends, and if the three-phase current is marked as an A phase, a B phase and a C phase, the A phase current sampling ends are A411+ and A411-, the B phase current sampling ends are B411+ and B411-, and the C phase current sampling ends are C411+ and C411+.
The working principle of the reactive power compensation circuit is as follows:
an external power supply is electrically connected with the busbar so as to supply power to the reactive power compensation circuit through the busbar, the external power supply is connected with the three-phase power supply input end of the busbar, and current flows through the primary sides of the three second current transformers 2TA after entering the busbar;
the three second current transformers are denoted as 2TAa, 2TAb and 2TAc, respectively.
The secondary side of the second current transformer 2TA induces the current and generates an induced current, and then the induced current signal is sent to a current sampling terminal 105 electrically connected with the induced current;
the current sampling terminal 105 sends the sampled current signal to the controller 102, and the controller 102 analyzes the sampled current;
when the phase of the sampling current is in a normal or advanced state, determining that reactive power compensation is not required to be performed on the current circuit; when the phase of the sampling current is in a lagging state, determining that reactive power compensation needs to be carried out on the current circuit;
when reactive power compensation needs to be carried out on the current circuit, the controller 102 controls the switches 103 to be closed;
when the switches 103 are closed, the coil of each contactor is conducted and generates a magnetic field, the magnetic field attracts a plurality of corresponding first contacts 603 in the reactive power compensation circuit of the capacitor to be closed, so that the reactive power compensation circuit of the capacitor is conducted, and then the self-healing capacitors C discharge to perform reactive power compensation on the circuit;
the second current transformer 2TA continuously samples the current of the compensated circuit and sends the current to the controller 102, the controller 102 compares whether the power factors of the three-phase power are equal, if so, the capacitance reactive power compensation circuit is used for continuously performing power compensation on the circuit, and the power factor of the circuit is detected in real time through the second current transformer 2 TA;
if the power factors of the three phases of electricity are not equal, for example, the power factor of the first phase is 0.95, the power factor of the second phase is 0.98, and the power factor of the third phase is 0.99, the circuit is continuously compensated through the static var generator 101, so that the power factors of the compensated three phases are equal, for example, the power factors of the compensated three phases are all 0.98; for the process of performing power compensation by using the static var generator 101, reference may be made to the related description, and details are not described herein.
Further, the static var generator 101 sends the generated data to a human-computer interface through a signal interface, so that a worker can conveniently obtain each data generated by the static var generator 101 through the human-computer interface, for example, the current working state of the reactive power compensation circuit, which may include that power compensation is being performed and power compensation is not performed, the current power factor of each phase circuit, the power factor of each phase circuit after compensation through the capacitance reactive power compensation circuit, the power factor after compensation through the static var generator 101, and the like.
In addition, the number of the self-healing capacitors C can be determined according to the condition of the circuit to be compensated, when the circuit loss is large, a large number of self-healing capacitors C can be arranged, and when the circuit loss is small, a small number of self-healing capacitors C can be arranged.
Therefore, when the number of the self-healing capacitors C is large, and one electric cabinet cannot accommodate the capacitors C, the circuits may be separately designed in a plurality of electric cabinets, as shown in fig. 4 and 8, and the circuits may be designed in two electric cabinets.
As can be seen from the above, the reactive power compensation circuit provided in the embodiment of the present application includes the static var generator 101 and the capacitance reactive compensation circuit, so that the power compensation of the circuit is realized through the mutual cooperation of the static var generator 101 and the capacitance reactive compensation circuit. The capacitor is low in price, and when the self-healing capacitor in the compensation circuit breaks down, a worker can replace the new capacitor at any time, and the compensation circuit can continue to perform power compensation after replacement, so that the working efficiency of the compensation circuit is improved to a certain extent; compared with the prior art, the reactive power compensation circuit only carries out power compensation on the circuit through the static var generator, and the reactive power compensation circuit provided by the embodiment of the application not only reduces the cost of the reactive power compensation circuit, but also improves the working efficiency of the reactive power compensation circuit.
Because the voltage input by the external power supply is generally 220V alternating current, and the working voltage of the human-computer interface 201 is 24V direct current, the transformer is selected to be a transformer capable of converting 220V alternating current into 24V direct current.
Optionally, the communication interface between the static var generator 101 and the human machine interface 201 is a 485 communication interface.
Optionally, an ammeter 2PA is further connected in series to a loop of each second current transformer 2TA, and then three ammeters corresponding to the three first current transformers 1TA are respectively marked as 2PAa, 2PAb, and 2PAc. The current of the circuit where the ammeter is located can be conveniently read through the three ammeters.
Optionally, the human-machine interface 201 further includes a data storage, a data processor, a display screen, etc. to facilitate data operation for the staff.
Further, the types of the human machine interface 201 include, but are not limited to, a smart phone, a tablet computer, a television, a notebook computer, a desktop computer, and the like, which is not particularly limited in the embodiments of the present application.
Optionally, referring to fig. 4, a third phase voltage output end of the busbar is electrically connected to second contacts 402 of the plurality of contactors connected in parallel, each second contact 402 is connected in series to an indicator light HW, and an output end of the indicator light HW is electrically connected to the zero line.
When the contactor coil 104 is energized, the second contact 402 is closed, and the loop where the indicator light HW is located is turned on, and the indicator light FU1 is turned on.
The indicator light HW is on because the controller 102 controls the switch 103 to close to implement power compensation by the power compensation circuit, and thus, when the indicator light HW is on, it is used to indicate that the reactive power compensation circuit is performing power compensation. The number of indicator lights HW is therefore the same as the number of second contacts 402, as shown in fig. 4, for a total of 14 indicator lights, HW1 to HW14 respectively.
Wherein every third first contact 603 and every second contact 402 correspond to the coils of the same contactor.
As can be seen from fig. 4, the first phase voltage output terminal, the second phase voltage output terminal, and the third phase voltage output terminal may be the same phase voltage output terminal.
Optionally, referring to fig. 4, a first fuse FU1 is electrically connected between the first phase voltage output terminal and the high voltage terminal of the transformer 401, the third phase voltage output terminal and the first phase voltage output terminal are the same phase voltage output terminal, and the input terminal of the second contact 402 is electrically connected to the output terminal of the first fuse FU1.
The first fuse FU1 is used for fusing when the current in the circuit is larger than a first preset current value, so that the circuit is in a disconnected state, other components are prevented from being burnt, and the effect of protecting the circuit is achieved.
Optionally, referring to fig. 5, a first circuit breaker 1QF is connected in series to a three-phase power line included in the busbar.
The first circuit breaker 1QF comprises three switches, each switch is connected in series with a phase voltage output end of a busbar, namely, the same circuit breaker is connected in series with a three-phase wire of the busbar, and the on-off of the three-phase wire of the busbar is controlled through the first circuit breaker 1QF. When the first circuit breaker 1QF is disconnected, the busbar is also in a disconnected state and stops supplying power to the circuit, and when the first circuit breaker 1QF is closed, the busbar is in a conducting state and supplies power to the circuit.
Alternatively, referring to fig. 8, fig. 8 is a method for implementing the reactive capacitance compensation circuit. As shown in fig. 8, the capacitance reactive compensation circuit further includes a second circuit breaker 2QF, and the second circuit breaker 2QF is electrically connected between the first contact 603 of the contactor and the three-phase voltage output terminal of the busbar.
The second circuit breaker 2QF comprises three switches, each switch is connected in series with a phase voltage output end of the busbar, and whether the three-phase voltage output end of the busbar supplies power for the capacitance reactive compensation circuit is controlled by one second circuit breaker 2 QF.
Optionally, referring to fig. 8, the reactive capacitance compensation circuit further includes three first current transformers 1TA. Each first current transformer 1TA is connected in series between one switch in the second circuit breaker 2QF and the first contact 603.
The three first current transformers 1TA are denoted as 1TAa, 1TAb, and 1TAc, respectively.
Optionally, an ammeter 1PA is further connected in series on the loop of each first current transformer 1TA, and then the three ammeters corresponding to the three first current transformers are respectively marked as 1PAa, 1PAb, and 1PAc. The current of the circuit where the ammeter is located can be conveniently read through the three ammeters.
Optionally, referring to fig. 8, the reactive capacitance compensation circuit further includes an arrester F, an input end of the arrester F is electrically connected to an output end of the first current transformer 1TA, and an output end of the arrester F is electrically connected to a ground wire.
Further, one lightning arrester F is installed on each phase electric wire of the three-phase electric wires. As shown in fig. 8, the arresters on the three-phase electric wire are an arrester F1, an arrester F2, and an arrester F3, respectively.
When the capacitance reactive power compensation circuit is struck by lightning, high voltage electricity can be generated, and the circuit is damaged. When the circuit is connected with the lightning arrester F, if lightning strikes, the lightning arrester F is conducted, current is introduced into the grounding wire, the current of the circuit where the lightning arrester F is located is increased, the second circuit breaker 2QF is disconnected, the busbar does not supply power to the capacitance reactive compensation circuit any more, and the effect of protecting the circuit is achieved.
Optionally, referring to fig. 8, the reactive capacitance compensation circuit further includes a plurality of second fuses FU2, each second fuse FU2 being electrically connected between one first current transformer 1TA and one first contact 603.
The second fuse FU2 is used for fusing when the current in the circuit is larger than a second preset current value, so that the circuit is in a disconnected state, other components are prevented from being burnt, and the effect of protecting the circuit is achieved.
Note that the number of self-healing capacitors C and the number of sets of second contacts in the reactive capacitance compensation circuit are generally equal to the number of coils 104 in the static var generator 101, and only 4 self-healing capacitors C and 4 sets of second contacts (3 contacts per set, and 12 contacts in total) are shown in fig. 8 as an example.
Wherein, the first group of second contacts is designated as KM1, the second group of second contacts is designated as KM2, and the third group of second contacts is designated as KM3.
Finally, it should be noted that all the contents not described in the technical solutions of the present application can be implemented by using the prior art. In addition, the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A reactive power compensation circuit is characterized by comprising a static reactive generator, a man-machine interface, a busbar, a transformer, an inductive load, a capacitive reactive power compensation circuit and three second current transformers;
the bus bar comprises a three-phase voltage output end, the static var generator comprises a three-phase current sampling end, and the static var generator is in signal connection with the human-computer interface;
each phase of the power line of the busbar is connected with the primary side of one second current transformer in series, the secondary side of the second current transformer is electrically connected with one phase of current sampling end of the static var generator, the three-phase voltage output end of the busbar is electrically connected with the static var generator, the capacitance reactive compensation circuit and the voltage input end of the inductive load, and the static var generator, the capacitance reactive compensation circuit and the inductive load are connected in parallel;
a first phase voltage output end of the busbar is electrically connected with a high-voltage end of the transformer, and a low-voltage end of the transformer is electrically connected with a voltage input end of the man-machine interface; the static var generator is provided with a controller and a plurality of switches connected in parallel, the controller is in signal connection with the three-phase current sampling end, the controller is mechanically connected with the plurality of switches connected in parallel, each switch is connected with a coil of a contactor in series, and the coil of each contactor is electrically connected with a zero line; the second phase voltage output end of the busbar is electrically connected with the voltage input ends of the switches connected in parallel;
the capacitance reactive power compensation circuit comprises a plurality of self-healing capacitors, each self-healing capacitor comprises a three-phase electric connection end, and each phase electric connection end is connected with a first contact of the contactor in series.
2. The reactive power compensation circuit according to claim 1, wherein a third phase voltage output end of the busbar is electrically connected with second contacts of a plurality of contactors in parallel, each second contact is connected with an indicator lamp in series, and an output end of the indicator lamp is electrically connected with the zero line.
3. The reactive power compensation circuit of claim 2, wherein a first fuse is electrically connected between the first phase voltage output terminal and the high voltage terminal of the transformer, the third phase voltage output terminal and the first phase voltage output terminal are the same phase voltage output terminal, and the input terminal of the second contact is electrically connected to the output terminal of the first fuse.
4. The reactive power compensation circuit of claim 1, wherein a first circuit breaker is connected in series to a three-phase power line of the busbar.
5. The reactive power compensation circuit of claim 1, further comprising a second circuit breaker electrically connected between the first contact of the contactor and the three-phase voltage output of the busbar.
6. The reactive power compensation circuit of claim 5, wherein the capacitive reactive compensation circuit comprises three first current transformers electrically connected between the second circuit breaker and the first contacts.
7. The reactive power compensation circuit of claim 6, wherein the capacitive reactive compensation circuit further comprises an arrester, an input end of the arrester being electrically connected to an output end of the current transformer, an output end of the arrester being electrically connected to a ground wire.
8. The reactive power compensation circuit of claim 7, wherein the capacitive reactive compensation circuit further comprises a plurality of second fuses, each of the second fuses electrically connected between one of the first current transformers and one of the first contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221602770.XU CN217590272U (en) | 2022-06-24 | 2022-06-24 | Reactive power compensation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221602770.XU CN217590272U (en) | 2022-06-24 | 2022-06-24 | Reactive power compensation circuit |
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| CN217590272U true CN217590272U (en) | 2022-10-14 |
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| CN202221602770.XU Active CN217590272U (en) | 2022-06-24 | 2022-06-24 | Reactive power compensation circuit |
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