CN219018680U - Leading circuit of low-voltage bus tie cabinet control power supply - Google Patents
Leading circuit of low-voltage bus tie cabinet control power supply Download PDFInfo
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- CN219018680U CN219018680U CN202223384002.4U CN202223384002U CN219018680U CN 219018680 U CN219018680 U CN 219018680U CN 202223384002 U CN202223384002 U CN 202223384002U CN 219018680 U CN219018680 U CN 219018680U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a leading circuit of a control power supply of a low-voltage bus tie cabinet, wherein a bus tie breaker is connected between a low-voltage section A bus and a low-voltage section B bus; the upper port of the first circuit breaker and the upper port of the second circuit breaker are respectively connected to the lower port and the upper port of the female circuit breaker; the low-voltage alternating-current contactor comprises a control coil, two groups of normally-open main contacts and two groups of normally-closed main contacts, wherein the control coil is connected to the lower port of the first circuit breaker, the two groups of normally-open main contacts are connected to the lower port of the first circuit breaker, and the two groups of normally-closed main contacts are connected to the lower port of the second circuit breaker; the control transformer comprises a primary coil and a secondary coil, wherein the primary coil is connected to the lower port of the low-voltage alternating-current contactor, and the secondary coil is connected to the control bus; and the control power supply is connected to the control bus through a third circuit breaker. The two ends of the bus-tie circuit breaker are respectively connected with one control power supply, and the automatic switching and the mutual locking of the two control power supplies are realized through the low-voltage alternating current contactor, so that the power supply is reliable, the maintenance workload is small, and the failure rate is low.
Description
Technical Field
The utility model relates to the technical field of low-voltage power distribution, in particular to a lead-in circuit of a control power supply of a low-voltage bus tie cabinet.
Background
For a low-voltage distribution system bus tie cabinet adopting a single bus segment wiring scheme, a control power supply is usually led to one side of a bus tie breaker (bus tie breaker) in the cabinet, namely, the control power supply is led to one of an upper port or a lower port of the bus tie breaker in the cabinet; or a reliable control power supply is additionally led out of the low-voltage power distribution cabinet.
The method is affected by the power receiving condition of the low-voltage distribution bus or the power supply reliability of an external power supply, the power supply reliability is poor, and the operation is complex.
Disclosure of Invention
The utility model aims to provide a lead-in circuit of a low-voltage bus tie cabinet control power supply, which solves the technical problems of poor power supply reliability and complex operation of the lead-in circuit of the existing low-voltage bus tie cabinet control power supply.
In order to achieve the above purpose, the utility model provides a leading circuit of a control power supply of a low-voltage bus connecting cabinet, which comprises a low-voltage section A bus, a low-voltage section B bus, a bus-bar circuit breaker, a first circuit breaker, a second circuit breaker, a low-voltage alternating current contactor, a control transformer, a control bus, a plurality of third circuit breakers and a plurality of control power supplies, wherein the first circuit breaker is connected with the first circuit breaker;
the bus-bar circuit breaker is connected between the low-voltage section A bus and the low-voltage section B bus;
the upper port of the first circuit breaker and the upper port of the second circuit breaker are respectively connected to the lower port and the upper port of the bus-tie circuit breaker;
the low-voltage alternating-current contactor comprises a control coil, two groups of normally-open main contacts and two groups of normally-closed main contacts, wherein the control coil is connected to the lower port of the first circuit breaker, the two groups of normally-open main contacts are connected to the lower port of the first circuit breaker, and the two groups of normally-closed main contacts are connected to the lower port of the second circuit breaker;
the control transformer comprises a primary coil and a secondary coil, wherein the primary coil is connected to the lower port of the low-voltage alternating-current contactor, and the secondary coil is connected to the control bus;
the control power supply is connected to the control bus through the third circuit breaker.
Optionally, the low-voltage section a bus and the low-voltage section B bus are segmented buses of the same main bus.
Optionally, the low-voltage section a bus and the low-voltage section B bus are both three-phase four-wire system or three-phase three-wire system.
Optionally, the upper port of the first circuit breaker is consistent with the access phase sequence of the upper port of the second circuit breaker.
Optionally, the voltages on the low-voltage section a bus and the low-voltage section B bus are 400V.
Optionally, the rated voltage of the control coil is 380V.
Optionally, the bus-tie breaker is a frame breaker.
Optionally, the first circuit breaker and the second circuit breaker are molded case circuit breakers.
Optionally, the maximum short-circuit breaking current of the first circuit breaker and the second circuit breaker is matched with the short-circuit current of the low-voltage section A bus and the low-voltage section B bus.
Optionally, the third circuit breaker is a miniature circuit breaker.
In the leading circuit of the control power supply of the low-voltage bus tie cabinet, the first circuit breaker and the second circuit breaker are in a connection state during normal operation, when the low-voltage section A bus and the low-voltage section B bus are powered on normally, the control coils of the low-voltage alternating-current contactor are powered on through the first circuit breaker, so that the two normally closed main contacts are disconnected, the two normally open main contacts are closed and supply power for the control transformer, the control bus is powered on after isolation and transformation through the control transformer, and the control power supply is further powered on through the third circuit breaker; when the low-voltage section A bus is normally powered on and the low-voltage section B bus is powered off, a control coil of the low-voltage alternating current contactor is powered on through the first circuit breaker, so that two groups of normally-closed main contacts are disconnected, the two groups of normally-open main contacts are closed and supply power for the control transformer, the control transformer is used for isolating and transforming the voltage and then supplying power for the control bus, and the third circuit breaker is used for supplying power for the control power supply; when the low-voltage section A bus is powered off and the low-voltage section B bus is powered on normally, the control coils of the low-voltage alternating current contactor are powered off, so that two groups of normally-open main contacts are disconnected, the two groups of normally-closed main contacts are closed and supply power for the control transformer, the control transformer is used for isolating and transforming the voltage and then supplying power to the control bus, and then the third circuit breaker is used for supplying power to the control power supply.
According to the utility model, one path of control power supply is respectively connected from two ends of the female-connection circuit breaker, and the automatic switching and the mutual locking of the two paths of control power supply are realized through the low-voltage alternating-current contactor.
Drawings
Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present utility model and do not constitute any limitation on the scope of the present utility model. Wherein:
fig. 1 is a circuit diagram of a connection circuit of a control power supply of a low-voltage bus tie cabinet according to an embodiment of the present utility model.
In the accompanying drawings:
a1, B1 and C1-three phase lines of the low-voltage section A bus; n1-neutral line of low-voltage A section bus; three phase lines of A2, B2 and C2-low-voltage B section buses; a neutral line of the N2-low-voltage B section bus; l-controlling the live wire of the bus; zero line of N-control bus; q1-a bus-bar circuit breaker; q01-first circuit breaker; q02-second circuit breaker; KM 01-ac contactor; a T-control transformer; q11, Q12, …, Q1 n-third circuit breaker; 1,2, …, n-control power supply.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the utility model more apparent. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the utility model. For a better understanding of the utility model with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure for the understanding and reading of the present disclosure, and are not intended to limit the scope of the utility model, which is defined by the appended claims, and any structural modifications, proportional changes, or dimensional adjustments, which may be made by the present disclosure, should fall within the scope of the present disclosure under the same or similar circumstances as the effects and objectives attained by the present utility model.
As used in this disclosure, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this disclosure, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. As used in this disclosure, the term "plurality" is generally employed in its sense including "at least one" unless the content clearly dictates otherwise. As used in this disclosure, the term "at least two" is generally employed in its sense including "two or more", unless the content clearly dictates otherwise. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third" may include one or at least two such features, either explicitly or implicitly.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected or in communication; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a schematic diagram of a connection circuit of a low-voltage bus tie cabinet control power supply according to an embodiment of the utility model. The embodiment provides a leading circuit of a control power supply of a low-voltage bus tie cabinet, which comprises a low-voltage section A bus, a low-voltage section B bus, a bus-tie breaker Q1, a first breaker Q01, a second breaker Q02, a low-voltage alternating-current contactor KM01, a control transformer T, a control bus, a plurality of third breakers and a plurality of control power supplies, wherein the leading circuit comprises a first bus-tie switch, a second bus-tie switch, a third bus-tie switch and a plurality of control power supplies;
the bus-bar circuit breaker Q1 is connected between the low-voltage section A bus and the low-voltage section B bus;
the upper port of the first circuit breaker Q01 and the upper port of the second circuit breaker Q02 are respectively connected to the lower port and the upper port of the bus-tie circuit breaker Q1;
the low-voltage alternating-current contactor KM01 comprises a control coil, two groups of normally-open main contacts and two groups of normally-closed main contacts, wherein the control coil is connected to the lower port of the first circuit breaker Q01, the two groups of normally-open main contacts are connected to the lower port of the first circuit breaker Q01, and the two groups of normally-closed main contacts are connected to the lower port of the second circuit breaker Q02;
the control transformer T comprises a primary coil and a secondary coil, wherein the primary coil is connected to the lower port of the low-voltage alternating-current contactor KM01, and the secondary coil is connected to the control bus;
the control power supply is connected to the control bus through the third circuit breaker.
The working principle of the utility model is as follows:
when the low-voltage section A bus and the low-voltage section B bus are normally electrified, the control coil of the low-voltage alternating-current contactor KM01 is electrified through the first circuit breaker Q01, so that two groups of normally closed main contacts are disconnected, the two groups of normally open main contacts are closed to supply power for the control transformer T, the control transformer T is isolated and transformed to supply power to the control bus, and then the third circuit breaker is used for supplying power to the control power supply; when the low-voltage section A bus is normally powered on and the low-voltage section B bus is powered off, a control coil of the low-voltage alternating current contactor KM01 is powered on through the first circuit breaker Q01, so that two groups of normally-closed main contacts are disconnected, the two groups of normally-open main contacts are closed and supply power for the control transformer T, the control bus is powered on after being isolated and transformed by the control transformer T, and then the control power is supplied by the third circuit breaker; when the low-voltage section A bus is powered off and the low-voltage section B bus is powered on normally, the control coil of the low-voltage alternating current contactor KM01 is powered off, so that two groups of normally open main contacts are disconnected, two groups of normally closed main contacts are closed and supply power for the control transformer T, the control transformer T is used for isolating and transforming the voltage and then supplying power to the control bus, and then the third circuit breaker is used for supplying power to the control power supply. The second circuit breaker Q02 is through follow female circuit breaker Q1's both ends draw respectively and connect a control power supply all the way to through low-voltage ac contactor KM01 realizes two way control power supply's automatic switch-over and mutual locking, compares in traditional scheme of drawing and connecting a control power supply all the way from female circuit breaker Q1's unilateral, and the power supply is more reliable, maintenance work load is littleer and the fault rate is lower.
In this embodiment, the control power supply may be used to control the on-off of the bus-tie breaker Q1. It should be understood that, for the scheme of connecting a control power supply from a single side of the bus-tie breaker Q1, when the connected sectional bus cannot be normally powered, although the power supply can be performed by closing the bus-tie breaker Q1, because the bus-tie breaker Q1 is remotely controlled by means of the control power supply, under the condition that the control power supply cannot get power, the bus-tie breaker Q1 needs to be manually closed, so that the consumed time is uncontrollable and more troublesome.
In this embodiment, the low-voltage section a bus and the low-voltage section B bus are segment buses of the same main bus.
In this embodiment, the low-voltage section a bus and the low-voltage section B bus are both three-phase four-wire system or three-phase three-wire system. In this embodiment, the low-voltage section a bus and the low-voltage section B bus are both three-phase four-wire systems, the low-voltage section a bus is composed of three phase lines A1, B1, C1 and a neutral line N1, and the low-voltage section B bus is composed of three phase lines A2, B2, C2 and a neutral line N2. L and N in fig. 1 represent the live and neutral wires, respectively, of the control bus.
Preferably, the upper port of the first circuit breaker Q01 is consistent with the access phase sequence of the upper port of the second circuit breaker Q02, so as to avoid that the control loop fault affects the main bus. For example, if the upper ports of the first circuit breaker Q01 are connected to the phase sequences A1 and C1, the upper ports of the second circuit breaker Q02 must be connected to the phase sequences A2 and C2, but not C2 and A2 or other wiring modes.
In this embodiment, the voltages on the low-voltage section a bus and the low-voltage section B bus are both 400V.
Preferably, the rated voltage of the control coil is 380V.
Preferably, the bus-tie circuit breaker Q1 is a frame circuit breaker, the first circuit breaker Q01 and the second circuit breaker Q02 are molded case circuit breakers, the third circuit breaker is a miniature circuit breaker, and the model and the type of each circuit breaker can be selected according to the use environment and the current magnitude, which is not particularly limited in this application.
Preferably, the maximum short-circuit breaking current of the first circuit breaker Q01 and the second circuit breaker Q02 is matched with the short-circuit current of the low-voltage section a bus and the low-voltage section B bus, so that when the lower opening of the first circuit breaker Q01 or the lower opening of the second circuit breaker Q02 is short-circuited, the first circuit breaker Q01 and the second circuit breaker Q02 cannot be normally opened due to small maximum short-circuit breaking current, or the circuit breakers are directly burnt out, and the fault range is enlarged.
In this embodiment, the control transformer T converts the voltage of 400V to 220V to supply the control power.
The third circuit breakers are the same in number and in one-to-one correspondence with the control power supplies. In this embodiment, the third circuit breakers Q11, Q12, …, Q1n respectively correspond to the control power sources 1,2, …, n, and the number of the third circuit breakers is not limited in this application. In this embodiment, the control power supply may be used to control electronic components on other control circuits besides the on-off of the bus-tie breaker Q1, which is not limited in this application.
In summary, the embodiment of the utility model provides a circuit for leading a control power supply of a low-voltage bus tie cabinet, which is characterized in that one path of control power supply is led to each of two ends of a bus tie breaker Q1, and automatic switching and mutual locking of two paths of control power supplies are realized through a low-voltage alternating current contactor KM01, compared with the traditional scheme of leading one path of control power supply from one side of the bus tie breaker Q1, the circuit is more reliable in power supply, smaller in maintenance workload and lower in failure rate.
The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the present utility model. It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, the present utility model is intended to include such modifications and alterations insofar as they come within the scope of the utility model or the equivalents thereof.
Claims (10)
1. The leading circuit of the control power supply of the low-voltage bus connecting cabinet is characterized by comprising a low-voltage section A bus, a low-voltage section B bus, a bus-bar circuit breaker, a first circuit breaker, a second circuit breaker, a low-voltage alternating-current contactor, a control transformer, a control bus, a plurality of third circuit breakers and a plurality of control power supplies, wherein the leading circuit comprises a first circuit breaker, a second circuit breaker, a first switching circuit breaker, a second switching circuit breaker, a first switching circuit breaker and a plurality of first switching circuit breakers;
the bus-bar circuit breaker is connected between the low-voltage section A bus and the low-voltage section B bus;
the upper port of the first circuit breaker and the upper port of the second circuit breaker are respectively connected to the lower port and the upper port of the bus-tie circuit breaker;
the low-voltage alternating-current contactor comprises a control coil, two groups of normally-open main contacts and two groups of normally-closed main contacts, wherein the control coil is connected to the lower port of the first circuit breaker, the two groups of normally-open main contacts are connected to the lower port of the first circuit breaker, and the two groups of normally-closed main contacts are connected to the lower port of the second circuit breaker;
the control transformer comprises a primary coil and a secondary coil, wherein the primary coil is connected to the lower port of the low-voltage alternating-current contactor, and the secondary coil is connected to the control bus;
the control power supply is connected to the control bus through the third circuit breaker.
2. The connection circuit of a low-voltage bus tie cabinet control power supply according to claim 1, wherein the low-voltage section a bus and the low-voltage section B bus are segmented buses of the same main bus.
3. The connection circuit of a low-voltage bus tie cabinet control power supply according to claim 1 or 2, wherein the low-voltage section a bus and the low-voltage section B bus are both three-phase four-wire system or three-phase three-wire system.
4. The connection circuit for a low voltage bus tie cabinet control power supply of claim 3 wherein the upper port of the first circuit breaker is in phase sequence with the upper port of the second circuit breaker.
5. The connection circuit of the low-voltage bus tie cabinet control power supply according to claim 3, wherein the voltages on the low-voltage section a bus and the low-voltage section B bus are 400V.
6. The connection circuit for a low voltage bus tie cabinet control power supply of claim 5, wherein the control coil has a rated voltage of 380V.
7. The connection circuit of a low voltage bus tie cabinet control power supply of claim 1, wherein the bus tie breaker is a frame breaker.
8. The connection circuit of a low voltage bus tie cabinet control power supply of claim 1, wherein the first circuit breaker and the second circuit breaker are molded case circuit breakers.
9. The connection circuit of a low voltage bus tie cabinet control power supply according to claim 1 or 8, wherein the maximum short circuit breaking current of the first circuit breaker and the second circuit breaker matches the short circuit current of the low voltage section a bus and the low voltage section B bus.
10. The connection circuit of the low voltage bus tie cabinet control power supply of claim 1, wherein the third circuit breaker is a miniature circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223384002.4U CN219018680U (en) | 2022-12-16 | 2022-12-16 | Leading circuit of low-voltage bus tie cabinet control power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223384002.4U CN219018680U (en) | 2022-12-16 | 2022-12-16 | Leading circuit of low-voltage bus tie cabinet control power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219018680U true CN219018680U (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223384002.4U Active CN219018680U (en) | 2022-12-16 | 2022-12-16 | Leading circuit of low-voltage bus tie cabinet control power supply |
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| Country | Link |
|---|---|
| CN (1) | CN219018680U (en) |
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- 2022-12-16 CN CN202223384002.4U patent/CN219018680U/en active Active
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