CN220066979U - Electrical interlocking circuit, device and system - Google Patents
Electrical interlocking circuit, device and system Download PDFInfo
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- CN220066979U CN220066979U CN202320779507.6U CN202320779507U CN220066979U CN 220066979 U CN220066979 U CN 220066979U CN 202320779507 U CN202320779507 U CN 202320779507U CN 220066979 U CN220066979 U CN 220066979U
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Abstract
The disclosure relates to an electrical interlocking circuit, an electrical interlocking device and an electrical interlocking system, which are used for solving the problem that the safety interlocking disc is limited by the reliability of an intermediate relay and an external power supply in the related art and is easy to cause tripping of a high-frequency power supply controller of a power plant. The electric interlocking circuit comprises N first key change-over switches, N second key change-over switches and N third key change-over switches corresponding to N power supply controllers, wherein N is a positive integer; the first ends of the N first key change-over switches after being connected in series are connected with the first ends of the N power controllers, the second ends of the N first key change-over switches after being connected in series are connected with the first ends of the N second key change-over switches, the second ends of the N second key change-over switches are connected with the first ends of the N third key change-over switches, the second ends of the N third key change-over switches are connected with the second ends of the N power controllers, and N is a positive integer smaller than or equal to N.
Description
Technical Field
The present disclosure relates to the field of electrical interlocking technologies, and in particular, to an electrical interlocking circuit, device, and system.
Background
After the high-frequency power supply of the power plant is stopped, the safety interlocking of the dust remover in an electric interlocking mode is adopted, and a manhole door can be opened to enter the dust remover body or an isolating switch operation box or a high-voltage operation room can be opened to operate only by taking down a corresponding key from the safety interlocking plate.
In the related art, however, an intermediate relay is used between the safety interlock plate and the high frequency power supply controller for loop control. The high-frequency power supply controllers of the power plants are connected in parallel, and the intermediate relays are also required to be connected with an external power supply, so that if the external power supply fails, or the connecting terminal of any intermediate relay is loose or poor in contact, the power failure of the intermediate relays can be caused, and then the tripping of the high-frequency power supply controllers of the power plants is caused.
Disclosure of Invention
The utility model aims to provide an electrical interlocking circuit, an electrical interlocking device and an electrical interlocking system, which are used for solving the problems that a safety interlocking disc is limited by the reliability of an intermediate relay and an external power supply and the tripping of a high-frequency power supply controller of a power plant is easy to cause in the related art.
To achieve the above object, a first aspect of embodiments of the present disclosure provides an electrical interlock circuit, the circuit including N first key switches, N second key switches, and N third key switches corresponding to N power supply controllers, where N is a positive integer;
the first ends of the N first key change-over switches after being connected in series are connected with the first ends of the N power controllers, the second ends of the N first key change-over switches after being connected in series are connected with the first ends of the N second key change-over switches, the second ends of the N second key change-over switches are connected with the first ends of the N third key change-over switches, the second ends of the N third key change-over switches are connected with the second ends of the N power controllers, and N is a positive integer smaller than or equal to N.
Optionally, N is a positive integer greater than or equal to 2, and each first key change-over switch has at least N pairs of contacts;
the first side contact of the nth pair of contacts in the 1 st first key change-over switch is connected with the first end of the nth power supply controller, the second side contact of the nth pair of contacts in the i th first key change-over switch is connected with the first side contact of the nth pair of contacts in the i+1th first key change-over switch, and the second side contact of the nth pair of contacts in the N th first key change-over switch is connected with the first end of the nth second key change-over switch, wherein i is a positive integer smaller than N.
Optionally, when a key of any one of the N first key transfer switches is pulled out, the transfer switch corresponding to the key is controlled to be turned off, so that the N power controllers stop running.
Optionally, when a key of any one of the nth second key change-over switch and the nth third key change-over switch is pulled out, the change-over switch corresponding to the key is controlled to be turned off, so that the nth power supply controller stops running.
Optionally, the electrical interlock circuit is connected with a background, and when a key of any one of the N first key transfer switches, the N second key transfer switches and the N third key transfer switches is pulled out, the background performs an electrical interlock disconnection prompt.
Optionally, the power supply controller is used for controlling the power supply of the dust remover of the power plant, the key of the first key change-over switch is a manhole door key of the dust remover, the key of the second key change-over switch is a disconnecting switch operation box key of the power plant, and the key of the third key change-over switch is a high-voltage operation room key of the power plant.
Optionally, the number of keys corresponding to any one of the N first key transfer switches, the N second key transfer switches, and the N third key transfer switches is 1.
Optionally, the first key change-over switch is an LW26S-S1Y type 2-gear N-section change-over switch, and the second key change-over switch and the third key change-over switch are LW26S-S1Y type 2-gear 2-section change-over switches.
A second aspect of an embodiment of the present disclosure further provides an electrical interlock device, including the first key switch, the second key switch, and the third key switch of any one of the first aspects.
A third aspect of an embodiment of the present disclosure further provides an electrical interlock system, including the electrical interlock circuit of any one of the first aspects and the electrical interlock device of the second aspect.
Through the technical scheme, the electric interlocking circuit comprises N first key change-over switches, N second key change-over switches and N third key change-over switches corresponding to N power controllers, wherein a first end of the N first key change-over switches after being connected in series is connected with a first end of the N power controllers, a second end of the N first key change-over switches after being connected in series is connected with a first end of the N second key change-over switches, a second end of the N second key change-over switches is connected with a first end of the N third key change-over switches, and a second end of the N third key change-over switches is connected with a second end of the N power controllers. Therefore, the circuit does not comprise an intermediate relay, and an external power supply is not needed, so that the tripping problem of the power supply controller caused by the reliability of the intermediate relay and the external power supply is avoided.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic circuit diagram of an electrical interlock circuit of the related art;
FIG. 2 is a schematic diagram of an electrical interlock circuit according to an exemplary embodiment;
FIG. 3 is a schematic diagram of another electrical interlock circuit shown in accordance with an exemplary embodiment;
fig. 4 is a circuit schematic of an electrical interlock circuit according to an exemplary embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect. The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below.
It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units. It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.
At present, the principle of the safety interlocking box of the electrical interlocking is that a separating interlocking change-over switch of each power plant is provided with a separating switch operation box key and a high-voltage operation room key, the total interlocking change-over switch is provided with a dust remover manhole door key, when a single power plant does not take power failure measures and maintenance personnel take off the separating interlocking key of the power plant, the safety interlocking disconnection alarm of a high-frequency power supply controller corresponding to the power plant is triggered, the high-frequency power supply controller trips, the power plant is automatically stopped, and therefore personal electric shock caused by the fact that an operator opens the high-voltage operation room or the separating switch operation box by mistake under the condition of no power failure is prevented. The main interlocking change-over switch is provided with a manhole door key, and because the power plant on one side is required to be completely stopped for internal maintenance of the power plant, when the manhole door key is taken down, the safety interlocking disconnection alarm of all high-frequency power supply controllers of the power plant on the side is triggered, and the all high-frequency power supply controllers of the power plant on the side are tripped, and the power plant is automatically stopped, so that personnel electric shock caused by the fact that an operator opens the manhole door by mistake under the condition that the power plant has not been powered off is prevented.
Referring to fig. 1, a certain a-room power plant is divided into a 1-side 1-4 power plant and a 2-side 1-4 power plant, if a dust collector manhole door of the 1-side 1 power plant needs to be opened, all the 1-side 1-4 power plants need to be stopped, and if an isolating switch operation box or a high-voltage operation room of the 1-side 1 power plant needs to be opened, only the 1-side 1 power plant needs to be stopped. In fig. 1, S is a 2-gear 1-section change-over switch, KA represents an intermediate relay (coil is on the left side in the figure, contact is on the right side in the figure), and 303 and 307 are respectively connected to a high-frequency power supply controller of a corresponding power plant, and QF is a circuit breaker. Taking a power plant on the side of the A room 1 for illustration, S1-S4 are transfer switches with total interlocking, corresponding to manhole door keys of the power plant on the side of the A room 1-4 respectively, and S5-S12 are transfer switches with partial interlocking, wherein S5, S7, S9 and S11 correspond to isolating switch operation box keys of the power plant on the side of the A room 1-4 respectively, and S6, S8, S10 and S12 correspond to high-voltage operation room keys of the power plant on the side of the A room 1-4 respectively. If the key of any one of the transfer switches S1-S4 is pulled out, the high-frequency power supply controllers of the power plants at the side 1-4 of the A room trip, the power plant stops running, and if the key of any one of the transfer switches S5-S12 is pulled out, the high-frequency power supply controller of the power plant corresponding to the key at the side 1 of the A room trips, and the power plant stops running.
However, the control mode of the electrical interlock shown in fig. 1 requires an external power supply, if the external power supply is abnormal, the plurality of intermediate relays lose power, and the live wire sides of the coils of the intermediate relays are connected in parallel, if any connecting terminal of the intermediate relay is loose or in poor contact, the plurality of intermediate relays lose power, and further the high-frequency power supply controller sends out fault signals and trips because of the disconnection of the electrical interlock loop, and the power plant stops running. In addition, if the connection of the change-over switch of any person's hole door key is loose or the contact of the switch contact is bad, all high-frequency power supply controllers on the corresponding side can send out fault signals and trip, and the power plant stops running.
Accordingly, the present disclosure provides an electrical interlock circuit, device and system to solve the above-mentioned problems.
The present disclosure is described below in connection with specific embodiments.
Fig. 2 is a schematic diagram illustrating the structure of an electrical interlock circuit according to an exemplary embodiment. As shown in fig. 2, the electrical interlock circuit includes N first key switches 21, N second key switches 22, and N third key switches 23 corresponding to N power controllers, where N is a positive integer.
The first ends of the N first key change-over switches are connected in series with the first ends of the N power controllers, the second ends of the N first key change-over switches are connected with the first ends of the N second key change-over switches, the second ends of the N second key change-over switches are connected with the first ends of the N third key change-over switches, the second ends of the N third key change-over switches are connected with the second ends of the N power controllers, and N is a positive integer smaller than or equal to N.
By adopting the technical scheme, as the circuit does not comprise the intermediate relay, an external power supply is not needed, and thus the tripping problem of the power supply controller caused by the reliability of the intermediate relay and the external power supply is avoided. And each second key change-over switch and each third key change-over switch are independently connected with the corresponding power supply controller, and even if any wiring part of the second key change-over switch and the third key change-over switch is loose or poor in contact, the power supply controllers cannot trip simultaneously.
Fig. 3 is a schematic diagram illustrating another electrical interlock circuit according to an exemplary embodiment. The electric interlocking circuit comprises N first key change-over switches 21, N second key change-over switches 22 and N third key change-over switches 23 corresponding to N power supply controllers, wherein N is a positive integer greater than or equal to 2, and each first key change-over switch is provided with at least N pairs of contacts. The first side contact of the nth pair of contacts in the 1 st first key change-over switch is connected with the first end of the nth power controller, the second side contact of the nth pair of contacts in the i th first key change-over switch is connected with the first side contact of the nth pair of contacts in the (i+1) th first key change-over switch, and the second side contact of the nth pair of contacts in the N th first key change-over switch is connected with the first end of the nth second key change-over switch, wherein i is a positive integer smaller than N.
By adopting the technical scheme, the first key change-over switch, the second key change-over switch and the third key change-over switch corresponding to each power supply controller independently form an interlocking loop, and the power supply controllers are not in circuit connection with each other. The tripping problem of the power supply controller caused by the reliability of the intermediate relay and the external power supply can be avoided. If any wiring part of the first key change-over switch, the second key change-over switch and the third key change-over switch is loose or poor in contact, a plurality of power supply controllers cannot be tripped at the same time.
For example, when a key of any one of the N first key transfer switches is pulled out, the transfer switch corresponding to the control key is turned off, so that the N power controllers stop running.
For example, when the key of any one of the nth second key change-over switch and the nth third key change-over switch is pulled out, the change-over switch corresponding to the control key is turned off, so that the nth power controller stops running.
The key change-over switch is a switch device with a key, and the on-off of the circuit is controlled by the insertion or extraction of the key, the circuit is in a closed state when the key is inserted, and the circuit is in an open state when the key is extracted. Referring to fig. 2 or 3, since the N first key switches are in a serial relationship, when a key of any one of the N first key switches is pulled out, the corresponding N power controllers stop operating. The second key change-over switch and the third key change-over switch are only connected with the corresponding power controllers, so that when any one of the second key change-over switch and the third key change-over switch is pulled out, the power controllers connected with the key switch corresponding to the key stop running.
In a possible mode, the electric interlock circuit is connected to the background, and when a key of any one of the N first key change-over switches, the N second key change-over switches, and the N third key change-over switches is pulled out, the background carries out electric interlock disconnection prompt.
For example, the electrical interlock circuit may be connected with a background for monitoring a state of the electrical interlock circuit, and if a key of any one of the N first key change-over switches, the N second key change-over switches, and the N third key change-over switches is pulled out, the background performs an electrical interlock disconnection prompt, thereby prompting an operator that the circuit is abnormal. Similarly, if a loose or poor contact of the connection part occurs, an electrical interlock disconnection prompt is also performed, which is not limited by the present disclosure.
Fig. 4 is a circuit schematic illustrating an electrical interlock circuit according to an example embodiment. Referring to fig. 4, the electric interlock circuit is set with a power plant as an application scenario, wherein a power controller is used for controlling a power supply of a dust remover of the power plant, a key of a first key change-over switch is a manhole door key of the dust remover, a key of a second key change-over switch is an isolating switch operation box key of the power plant, and a key of a third key change-over switch is a high-voltage operation room key of the power plant.
Illustratively, the first key switch is an LW26S-S1Y type 2 gear N-section switch, and the second and third key switches are LW26S-S1Y type 2 gear 2-section switches. Taking the corresponding 4 power controllers as an example, the first key change-over switch can be a 2-gear 4-section change-over switch, can also be a 2-gear 6-section change-over switch, and the second key change-over switch and the third key change-over switch can be a 2-gear 1-section change-over switch or a 2-gear 2-section change-over switch.
For example, following the above example, a certain a-room power plant is divided into a 1-side 1-4 power plant and a 2-side 1-4 power plant, if the manhole door of the dust collector of the 1-side 1 power plant needs to be opened, the 1-side 1-4 power plant needs to be completely stopped, if the disconnecting switch operation box or the high-voltage operation room of the 1-side 1 power plant needs to be opened, the 1-side 1 power plant only needs to be stopped, and the above requirements can be met according to the electrical interlock circuit in fig. 4. As shown in FIG. 4, the power plant on the side of Chamber A1 is exemplified by SB1-SB4 as the first key transfer switch, corresponding to the manhole door keys of the power plants on the side of Chamber A1-4, respectively, each transfer switch comprising a plurality of pairs of contacts (4 power controllers, 2-speed 4-section switches, 4 pairs of contacts are exemplified in FIG. 4). SB5, SB7, SB9, SB11 are second key transfer switches, correspond respectively to the isolator operation box keys of 1-4 power plants of A room 1 side, and SB6, SB8, SB10, SB12 are third key transfer switches, correspond respectively to the high voltage operation room keys of 1-4 power plants of A room 1 side. A pair of contacts in the first key change-over switch, the second key change-over switch and the third key change-over switch are connected in series, two ends (303 and 307) are respectively connected to high-frequency power supply controllers of corresponding power plants, independent loops of each power plant are not interfered with each other, and if any wiring position of SB1-SB12 is loose or poor in contact, a plurality of power supply controllers cannot be tripped simultaneously. If the key of any one of the transfer switches SB1-SB4 is pulled out, the high-frequency power supply controllers of the power plants 1-4 on the side of the room A1 are tripped, the power plant stops running, and if the key of any one of the transfer switches SB5-SB12 is pulled out, the high-frequency power supply controller of the power plant corresponding to the key on the side of the room A1 is tripped, and the power plant stops running, so that the requirements are met.
For example, the number of keys corresponding to any one of the N first key transfer switches, the N second key transfer switches, and the N third key transfer switches is 1. Because the keys of each key change-over switch are one and only one, if an operator needs to enter the power plant to operate, the key must be pulled out, and thus the power plant can stop operation correspondingly, the condition that the operator enters the power plant to operate under the condition that the power plant operates is avoided, and the personal safety of the operator is ensured.
Based on the same inventive concept, the embodiment of the disclosure further provides an electrical interlocking device, which comprises the first key change-over switch, the second key change-over switch and the third key change-over switch.
Based on the same inventive concept, the embodiment of the disclosure also provides an electrical interlocking system, which comprises the electrical interlocking circuit and the electrical interlocking device.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. An electrical interlock circuit is characterized by comprising N first key change-over switches, N second key change-over switches and N third key change-over switches corresponding to N power supply controllers, wherein N is a positive integer;
the first ends of the N first key change-over switches after being connected in series are connected with the first ends of the N power controllers, the second ends of the N first key change-over switches after being connected in series are connected with the first ends of the N second key change-over switches, the second ends of the N second key change-over switches are connected with the first ends of the N third key change-over switches, the second ends of the N third key change-over switches are connected with the second ends of the N power controllers, and N is a positive integer smaller than or equal to N.
2. The electrical interlock circuit of claim 1 wherein N is a positive integer greater than or equal to 2, each of the first key switches having at least N pairs of contacts;
the first side contact of the nth pair of contacts in the 1 st first key change-over switch is connected with the first end of the nth power supply controller, the second side contact of the nth pair of contacts in the i th first key change-over switch is connected with the first side contact of the nth pair of contacts in the i+1th first key change-over switch, and the second side contact of the nth pair of contacts in the N th first key change-over switch is connected with the first end of the nth second key change-over switch, wherein i is a positive integer smaller than N.
3. The electrical interlock circuit of claim 1 wherein when a key of any one of the N first key switches is pulled out, the corresponding switch of the key is controlled to be turned off to stop the N power controllers.
4. The electrical interlock circuit of claim 1 wherein when a key of either the nth second key change-over switch or the nth third key change-over switch is pulled out, the change-over switch corresponding to the key is controlled to be turned off so that the nth power source controller stops operating.
5. The electrical interlock circuit of claim 1 wherein the electrical interlock circuit is connected to a background that provides an electrical interlock disconnection notification when a key of any of the N first key transfer switches, the N second key transfer switches, and the N third key transfer switches is pulled out.
6. The electrical interlock circuit of claim 1 wherein the power source controller is configured to control a power source of a dust collector of a power plant, the key of the first key switch is a manhole door key of the dust collector, the key of the second key switch is a disconnector operator box key of the power plant, and the key of the third key switch is a high voltage operator box key of the power plant.
7. The electrical interlock circuit of claim 1 wherein the number of keys corresponding to any one of the N first key switches, the N second key switches, and the N third key switches is 1.
8. The electrical interlock circuit of any one of claims 1-7 wherein the first key transfer switch is a LW26S-S1Y type 2 gear N-section transfer switch and the second key transfer switch and the third key transfer switch are LW26S-S1Y type 2 gear 2-section transfer switches.
9. An electrical interlock device comprising an electrical interlock circuit according to any one of claims 1 to 8.
10. An electrical interlock system comprising the electrical interlock device of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202320779507.6U CN220066979U (en) | 2023-04-04 | 2023-04-04 | Electrical interlocking circuit, device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320779507.6U CN220066979U (en) | 2023-04-04 | 2023-04-04 | Electrical interlocking circuit, device and system |
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| CN220066979U true CN220066979U (en) | 2023-11-21 |
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| CN202320779507.6U Active CN220066979U (en) | 2023-04-04 | 2023-04-04 | Electrical interlocking circuit, device and system |
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