CN219498936U - Overload protection mechanism of capacitor cabinet and capacitor cabinet - Google Patents
Overload protection mechanism of capacitor cabinet and capacitor cabinet Download PDFInfo
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- CN219498936U CN219498936U CN202320258286.8U CN202320258286U CN219498936U CN 219498936 U CN219498936 U CN 219498936U CN 202320258286 U CN202320258286 U CN 202320258286U CN 219498936 U CN219498936 U CN 219498936U
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- capacitor
- capacitive
- reactor
- electrically connected
- protection mechanism
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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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Abstract
The utility model discloses a capacitor box overload protection mechanism and a capacitor box, wherein the capacitor box overload protection mechanism is arranged in the capacitor box and comprises a capacitor switching switch, a reactor and a capacitor; one end of a contact of the capacitor switching switch is electrically connected with a phase line of a control power supply, and the other end of the contact of the capacitor switching switch is electrically connected with a capacitor through the reactor to form a primary loop; one end of the temperature auxiliary point of the reactor is electrically connected with a phase line of the control power supply, the other end of the temperature auxiliary point of the reactor is electrically connected with one end of the coil of the capacitor switching switch, and the other end of the coil of the capacitor switching switch is electrically connected with a zero line of the control power supply to form a secondary loop. According to the technical scheme, the capacitor switching switch is connected with the temperature auxiliary contact of the reactor in series, so that overheat protection can be realized by additionally arranging the thermal relay in the primary loop, the high-temperature operation loop can be cut off under the condition that the thermal relay is not added, the investment of cost is reduced, the economic value is realized, the space for part of installation is saved, and the heat dissipation is facilitated.
Description
Technical Field
The utility model relates to the technical field of protection loops of low-voltage capacitance compensation cabinets, in particular to a capacitance cabinet overload protection mechanism and a capacitance cabinet.
Background
The reactor and the capacitor in the capacitor cabinet generate very large heat, so that the temperature in the capacitor cabinet is increased to influence the normal operation of internal components, and temperature control measures such as ventilation and heat dissipation or cutting off a reactance loop running for a long time must be adopted, thereby reducing the temperature in the capacitor cabinet and ensuring the normal operation of the components.
In the existing electric load, a large amount of harmonic exists, and a capacitor is just a key device for causing resonance, so that a reactor is generally connected in series in a capacitor loop to eliminate the harmonic, and a wiring diagram of the reactor in a capacitor cabinet is shown in fig. 1 and 2, and a thermal relay is not arranged. When a certain loop runs for a long time or fails, the temperature is continuously increased, and the overload (thermal) protection is not carried out in the loop, so that the components are damaged, and the performance of the components in the whole capacitor cabinet is reduced and the service life is reduced due to the fact that the temperature in the capacitor cabinet is too high. If the thermal relay is additionally arranged, the cost is higher, and the installation space in the capacitor box is occupied.
Disclosure of Invention
Therefore, it is necessary to provide a capacitive cabinet overload protection mechanism and a capacitive cabinet, and to provide an overload protection scheme that can realize cutting off a reactance loop running for a long time without adding a thermal relay, thereby reducing the temperature in the cabinet.
In order to achieve the above object, the present embodiment provides a capacitive cabinet overload protection mechanism, which is disposed in a capacitive cabinet and includes a capacitive on-off switch, a reactor, and a capacitor;
one end of a contact of the capacitor switching switch is electrically connected with a phase line of a control power supply, and the other end of the contact of the capacitor switching switch is electrically connected with a capacitor through the reactor to form a primary loop;
one end of the temperature auxiliary point of the reactor is electrically connected with a phase line of the control power supply, the other end of the temperature auxiliary point of the reactor is electrically connected with one end of the coil of the capacitor switching switch, and the other end of the coil of the capacitor switching switch is electrically connected with a zero line of the control power supply to form a secondary loop.
Further, the reactor also comprises a control switch, wherein the control switch is arranged on the secondary loop and is used for switching on or off the reactor.
Further, the control switch comprises a change-over switch and a capacitance compensation controller, one end of the change-over switch is electrically connected with a phase line of the control power supply, the other end of the change-over switch is electrically connected with the input end of the capacitance compensation controller, and the output end of the capacitance compensation controller is electrically connected with one end of a temperature auxiliary point of the reactor.
Further, the control switch comprises a manual switch electrically connected to the secondary circuit.
Further, the secondary circuit further comprises a fuse, and the fuse is electrically connected to the secondary circuit.
Further, a transformer is also included, the transformer being connected to the primary loop.
Further, the capacitor switching switch is a capacitor switching contactor.
Further, the capacitor switching switch is a compound switch.
In order to achieve the above object, this embodiment further provides a capacitive cabinet, including a cabinet body and a capacitive cabinet overload protection mechanism disposed in the cabinet body, where the capacitive cabinet overload protection mechanism is a capacitive cabinet overload protection mechanism according to any one of the embodiments.
Compared with the prior art, in the technical scheme, the capacitor switching switch is connected in series with the temperature auxiliary contact of the reactor, and can replace a primary loop to be additionally provided with a thermal relay to realize overheat protection; when the temperature of the reactor reaches the set upper limit, the temperature auxiliary contact of the reactor cuts off the capacitor switching switch control circuit of the circuit, so that the high-temperature reactor is taken out of operation, and the capacitor cabinet automatically switches other capacitor circuits, thereby ensuring the normal operation of the capacitor cabinet; the high-temperature operation loop is cut off under the condition that the thermal relay is not increased, the investment of cost is reduced, the high-temperature operation loop has economic value, and the space for partial installation is saved in the capacitor cabinet due to the fact that the component of the thermal relay is omitted, heat dissipation is facilitated, and economic benefit is good.
Drawings
FIG. 1 is one of the wiring diagrams of a reactor in a capacitor box in the background art;
FIG. 2 is a second wiring diagram of a reactor in a capacitor box in the background art;
FIG. 3 is a wiring diagram of a primary circuit of the capacitive cabinet overload protection mechanism in this embodiment;
FIG. 4 is one of the wiring diagrams of the secondary circuit of the capacitive cabinet overload protection mechanism in this embodiment;
fig. 5 is a second wiring diagram of the secondary circuit of the capacitive cabinet overload protection mechanism in this embodiment.
Reference numerals illustrate:
1. a capacitor switching switch; 11. a coil;
2. a reactor;
3. a capacitor;
4. a change-over switch;
5. a capacitance compensation controller; 51. an output circuit;
6. a manual switch;
7. a fuse;
8. a transformer;
9. and a capacitor switching circuit.
Detailed Description
In order to describe the possible application scenarios, technical principles, practical embodiments, and the like of the present application in detail, the following description is made with reference to the specific embodiments and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples and are not intended to limit the scope of protection of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.
Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains; the use of related terms herein is for the description of specific embodiments only and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a representation for describing a logical relationship between objects, which means that there may be three relationships, e.g., a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.
In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.
Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this application is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.
As in the understanding of the "examination guideline," the expressions "greater than", "less than", "exceeding", and the like are understood to exclude the present number in this application; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of groups", "a plurality of" and the like, unless specifically defined otherwise.
In the description of the embodiments of the present application, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as terms of orientation or positional relationship based on the specific embodiments or figures, and are merely for convenience of description of the specific embodiments of the present application or ease of understanding of the reader, and do not indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation, and therefore are not to be construed as limiting of the embodiments of the present application.
Unless specifically stated or limited otherwise, in the description of the embodiments of the present application, the terms "mounted," "connected," "affixed," "disposed," and the like are to be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains according to the specific circumstances.
Referring to fig. 3 to 5, the present embodiment provides a capacitive cabinet overload protection mechanism, which is disposed in a capacitive cabinet to prevent overload of the capacitive cabinet; the overload protection mechanism of the capacitor cabinet comprises a capacitor switching switch 1, a reactor 2 and a capacitor 3;
one end of a contact of the capacitor switching switch 1 is electrically connected with a phase line of a control power supply, and the other end of the contact is electrically connected with a capacitor 3 through a reactor 2;
one end of the temperature auxiliary point of the reactor 2 is electrically connected to the phase line of the control power supply, the other end is electrically connected to one end of the coil 11 of the capacitance switching switch 1, and the other end of the coil 11 of the capacitance switching switch 1 is electrically connected to the zero line of the control power supply.
The capacitive switching switch 1, also called capacitive switching device, refers to a switching device for switching the capacitor 3 in the reactive compensation device. The reactive compensation device is a device for improving the power utilization efficiency, reducing the power consumption, improving the power supply quality and the like by improving the power factor of the power grid.
The capacitor 3 is a device for storing electric quantity and electric energy (potential energy) and comprises two conductors adjacent to each other and a nonconductive insulating medium between the two conductors.
The reactor 2, also called an inductor, is widely used in a circuit, and has a certain inductance due to the effect of electromagnetic induction in the circuit, and can function to prevent a current change. The reactor 2 is a component with more heat, a normally-closed temperature control sensor is buried in the reactor, the normally-closed temperature control sensor can realize overheat protection function, a temperature auxiliary point is used as a normally-closed contact, when the temperature of the reactor 2 is too high, the contact is opened, and a capacitor loop can be cut off by using the contact, so that the reactor 2 can be withdrawn from a circuit to operate, and the safety of a capacitor cabinet is ensured.
Compared with the prior art, in the technical scheme, the capacitor switching switch is connected in series with the temperature auxiliary contact of the reactor, and can replace a primary loop to be additionally provided with a thermal relay to realize overheat protection; when the temperature of the reactor reaches the set upper limit, the temperature auxiliary contact of the reactor cuts off the capacitor switching switch control circuit of the circuit, so that the high-temperature reactor is taken out of operation, and the capacitor cabinet automatically switches other capacitor circuits, thereby ensuring the normal operation of the capacitor cabinet; the high-temperature operation loop is cut off under the condition that the thermal relay is not increased, the investment of cost is reduced, the high-temperature operation loop has economic value, and the space for partial installation is saved in the capacitor cabinet due to the fact that the component of the thermal relay is omitted, heat dissipation is facilitated, and economic benefit is good.
Referring to fig. 3 to 5, according to an embodiment of the present application, the capacitive cabinet overload protection mechanism further includes a control switch, where the control switch is disposed on the secondary circuit and is used to turn on or off the reactor 2, so as to further ensure safe operation of the capacitive cabinet.
Referring to fig. 5, according to an embodiment of the present application, the control switch includes a change-over switch 4 and a capacitance compensation controller 5, one end of the change-over switch 4 is electrically connected to a phase line of the control power supply, the other end of the change-over switch 4 is electrically connected to an input end of the capacitance compensation controller 5, and an output end of the capacitance compensation controller 5 is electrically connected to one end of a temperature auxiliary point of the reactor 2, so that one end of the temperature auxiliary point of the reactor 2 is indirectly connected between the change-over switch 4 and the capacitance compensation controller 5 and the phase line of the control power supply, and the reactor 2, the change-over switch 4 and the capacitance compensation controller 5 are connected in series. The capacitance compensation controller 5 is used for controlling the on-off of the transfer switch 4, so as to control the on-off of the reactor 2, and a worker can remotely control the on-off of the transfer switch 4 through the capacitance compensation controller 5. The capacitance compensation controller 5 controls the change-over switch 4 to be opened, the circuit is communicated, current flows to the reactor 2 through an output circuit 51 in the capacitance compensation controller 5, and the reactor 2 is electrically operated; the capacitance compensation controller 5 controls the change-over switch 4 to be closed, the circuit is disconnected, and the reactor 2 stops running.
Referring to fig. 4 and 5, according to one embodiment of the present application, the control switch includes a manual switch 6, and the manual switch 6 is electrically connected to the secondary circuit, so that a worker can directly control the manual switch 6 to close the circuit in the field in case of emergency.
Referring to fig. 4 and 5, in the secondary circuit, a circuit disposed between a phase line and a zero line of the control power supply is named as a capacitor switching circuit 9, and the capacitor switching circuit 9 is provided with a reactor 2, a capacitor switching switch 1 and corresponding wires, and may be further provided with a transfer switch 4, a capacitor compensation controller 5 and a manual switch 6. The capacitor switching circuit 9 has one or more paths, such as two paths, three paths, four paths and five paths, and fig. 4 shows the capacitor switching circuit 9 with two paths. Correspondingly, the primary loop also has multiple paths, corresponding to the capacitor switching circuit 9.
Referring to fig. 4 and 5, according to an embodiment of the present application, the number of output circuits 51 inside the capacitance compensation controller 5 is the same as the number of capacitance switching circuits 9. Fig. 4 shows two paths of capacitor switching circuits 9, two paths of output circuits 51 are arranged in the capacitor compensation controller 5, and one path of output circuits 51 is electrically connected with one path of capacitor switching circuits 9. Each path of capacitor switching circuit 9 is provided with a manual switch 6.
Referring to fig. 4 and 5, according to an embodiment of the present application, the capacitive cabinet overload protection mechanism further includes a fuse 7, where the fuse 7 is electrically connected to the secondary circuit. The fuse 7 (fuse) is a device that fuses a melt by heat generated by itself when a current exceeds a predetermined value, and opens a circuit. The fuse 7 melts the melt by the heat generated by the fuse after the current exceeds a prescribed value for a period of time, thereby breaking the circuit; a current protector is made by applying the principle.
Referring to fig. 3, according to an embodiment of the present application, the capacitive cabinet overload protection mechanism further includes a transformer 8, where the transformer 8 is connected to the primary loop and is located on a wire between the capacitive switch 1 and the phase line. The transformer 8 is capable of scaling high voltage to low voltage, high current to low current, for example scaling high voltage or high current to standard low voltage (100V) or standard low current (5A or 1A, both referring to ratings) for measurement or protection systems.
According to one embodiment of the present application, the capacitive switching switch 1 is a capacitive switching contactor or a compound switch. Taking a capacitor switching contactor as an example, the working principle of the capacitor switching contactor is as follows: when the coil is electrified, the static iron core generates electromagnetic attraction force, the armature is attracted, and the connecting rod connected with the armature drives the contact to act, so that the normally closed contact is in an electrified state; when the coil is powered off, the electromagnetic attraction force disappears, the armature is opened again, the normally open contact is closed, the normally open contact is released under the action of the position spring, all the contacts are reset along with the release, and the contactor is in a power-off state.
According to one embodiment of the present application, L1, L2 and L3 in fig. 1 represent three phase lines, and three-phase alternating current is a transmission form of electric energy, which is simply referred to as three-phase power, and is a power source composed of three alternating current potentials with the same frequency, equal amplitude and 120 ° phase difference in sequence.
The embodiment also provides a capacitor box, which comprises a box body and a capacitor box overload protection mechanism arranged in the box body, wherein the capacitor box overload protection mechanism is the capacitor box overload protection mechanism according to any one of the embodiments, and the structure is shown in fig. 3 to 5.
The capacitor cabinet, also called as a capacitor compensation cabinet, can improve the energy waste caused by low power factor of the power grid, so that the power factor of the power grid is effectively improved. The load types in the power system mostly belong to inductive loads, and power electronic equipment is widely used by power enterprises, so that the power factor of a power grid is low. The lower power factor reduces the utilization rate of equipment, increases the power supply investment, damages the voltage quality, reduces the service life of the equipment and greatly increases the line loss. Therefore, inductive loads can be balanced and power factors can be improved by connecting the capacitor cabinet in the power system, so that the utilization rate of equipment can be improved.
The technical scheme of the utility model is as follows: the output point of the capacitance compensation controller is connected with a contactor, and then is connected with a temperature auxiliary contact of the reactor in series, so that the overheat protection can be realized by replacing a primary loop with a thermal relay. When the temperature of the reactor reaches the set upper limit, the temperature auxiliary contact of the reactor cuts off the capacitor switching switch control circuit of the circuit, so that the high-temperature reactor is taken out of operation, and the capacitor cabinet automatically switches other capacitor circuits, thereby ensuring the normal operation of the capacitor cabinet.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present utility model is not limited thereby. Therefore, based on the innovative concepts of the present utility model, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solutions directly or indirectly to other relevant technical fields, all of which are included in the scope of protection of the present patent.
Claims (9)
1. The capacitive cabinet overload protection mechanism is arranged in a capacitive cabinet and is characterized by comprising a capacitive switching switch, a reactor and a capacitor;
one end of a contact of the capacitor switching switch is electrically connected with a phase line of a control power supply, and the other end of the contact of the capacitor switching switch is electrically connected with a capacitor through the reactor to form a primary loop;
one end of the temperature auxiliary point of the reactor is electrically connected with a phase line of the control power supply, the other end of the temperature auxiliary point of the reactor is electrically connected with one end of the coil of the capacitor switching switch, and the other end of the coil of the capacitor switching switch is electrically connected with a zero line of the control power supply to form a secondary loop.
2. The capacitive cabinet overload protection mechanism of claim 1, further comprising a control switch disposed on the secondary circuit for switching the reactor on or off.
3. The capacitive cabinet overload protection mechanism according to claim 2, wherein the control switch comprises a change-over switch and a capacitive compensation controller, one end of the change-over switch is electrically connected to a phase line of the control power supply, the other end of the change-over switch is electrically connected to an input end of the capacitive compensation controller, and an output end of the capacitive compensation controller is electrically connected to one end of the temperature auxiliary point of the reactor.
4. A capacitive cabinet overload protection mechanism according to claim 2, wherein the control switch comprises a manual switch electrically connected to the secondary circuit.
5. The capacitive cabinet overload protection mechanism of claim 1, further comprising a fuse electrically connected to the secondary circuit.
6. The capacitive cabinet overload protection mechanism of claim 1, further comprising a transformer connected to the primary circuit.
7. The capacitive cabinet overload protection mechanism of claim 1, wherein the capacitive switching switch is a capacitive switching contactor.
8. The capacitive cabinet overload protection mechanism of claim 1, wherein the capacitive switching switch is a compound switch.
9. The capacitor box is characterized by comprising a box body and a capacitor box overload protection mechanism arranged in the box body, wherein the capacitor box overload protection mechanism is the capacitor box overload protection mechanism according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320258286.8U CN219498936U (en) | 2023-02-20 | 2023-02-20 | Overload protection mechanism of capacitor cabinet and capacitor cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320258286.8U CN219498936U (en) | 2023-02-20 | 2023-02-20 | Overload protection mechanism of capacitor cabinet and capacitor cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219498936U true CN219498936U (en) | 2023-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320258286.8U Active CN219498936U (en) | 2023-02-20 | 2023-02-20 | Overload protection mechanism of capacitor cabinet and capacitor cabinet |
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| Country | Link |
|---|---|
| CN (1) | CN219498936U (en) |
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2023
- 2023-02-20 CN CN202320258286.8U patent/CN219498936U/en active Active
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