CN115833614A - Leading circuit of low-voltage bus connection cabinet control power supply - Google Patents
Leading circuit of low-voltage bus connection cabinet control power supply Download PDFInfo
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- CN115833614A CN115833614A CN202211623677.1A CN202211623677A CN115833614A CN 115833614 A CN115833614 A CN 115833614A CN 202211623677 A CN202211623677 A CN 202211623677A CN 115833614 A CN115833614 A CN 115833614A
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Abstract
The invention provides a leading circuit of a low-voltage bus tie cabinet control power supply, 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 connection 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, 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 breaker. The control power supplies are respectively connected from two ends of the bus tie circuit breaker in a leading mode, automatic switching and mutual locking of the two control power supplies are achieved through the low-voltage alternating current contactor, power supply is reliable, maintenance workload is small, and failure rate is low.
Description
Technical Field
The invention relates to the technical field of low-voltage power distribution, in particular to a leading circuit of a control power supply of a low-voltage bus connection cabinet.
Background
For a low-voltage distribution system bus connection cabinet adopting a single-bus sectional wiring scheme, a control power supply is generally led from one side of a bus connection breaker (bus connection breaker) in the cabinet, namely the control power supply is led from one of an upper opening and a lower opening of the bus connection breaker in the cabinet; or a reliable control power supply is additionally led from the outside of the low-voltage power distribution cabinet.
The method is influenced 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 invention aims to provide a leading circuit of a low-voltage bus connection cabinet control power supply, which solves the technical problems of poor power supply reliability and complex operation of the existing leading circuit of the low-voltage bus connection cabinet control power supply.
In order to achieve the aim, the invention provides a leading circuit of a control power supply of a low-voltage bus connection cabinet, which comprises a low-voltage A section bus, a low-voltage B section bus, a bus coupler 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 low-voltage A section bus is connected with the control power supply through the leading circuit;
the bus coupler 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-coupled 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, 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 a three-phase four-wire system or a three-phase three-wire system.
Optionally, the access phase sequence of the upper port of the first circuit breaker is consistent with that of the upper port of the second circuit breaker.
Optionally, the voltage on the low-voltage section a bus and the voltage on the low-voltage section B bus are both 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 maximum short-circuit breaking current of the second circuit breaker are matched with the short-circuit current of the low-voltage section a bus and the short-circuit current of the low-voltage section B bus.
Optionally, the third circuit breaker is a miniature circuit breaker.
In the leading circuit of the low-voltage bus connection cabinet control power supply provided by the invention, the first circuit breaker and the second circuit breaker are in a connected state during normal work, when the low-voltage A section bus and the low-voltage B section bus are normally powered, the control coil of the low-voltage alternating current contactor is powered through the first circuit breaker, so that two groups of normally closed main contacts are disconnected, two groups of normally open main contacts are closed and supply power to the control transformer, the control transformer is isolated and transformed by the control transformer and then supplies power to the control bus, and further the third circuit breaker supplies power to the control power supply; when the low-voltage A section bus is normally powered on and the low-voltage B section bus is not powered on, a control coil of the low-voltage alternating current contactor is powered on through the first circuit breaker, so that the two groups of normally closed main contacts are disconnected, the two groups of normally open main contacts are closed and supply power to the control transformer, the control transformer is isolated and transformed to supply power to the control bus, and then the control power supply is supplied with power through the third circuit breaker; when the low-voltage A section bus is in power loss and the low-voltage B section bus is normally powered on, the control coil of the low-voltage alternating current contactor is in power loss, so that the two groups of normally-open main contacts are disconnected, the two groups of normally-closed main contacts are closed and supply power to the control transformer, the control transformer supplies power to the control bus after isolating and transforming voltage, and the control power supply supplies power to the control bus through the third circuit breaker.
According to the invention, one path of control power supply is respectively led from two ends of the bus-coupled circuit breaker, and automatic switching and mutual locking of two paths of control power supplies are realized through the low-voltage alternating current contactor.
Drawings
It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:
fig. 1 is a circuit diagram of a connection circuit of a control power supply of a low-voltage bus bar connection cabinet according to an embodiment of the present invention.
In the drawings:
a1, B1 and C1-three phase lines of a low-voltage section A bus; n1-neutral line of the low-voltage section A bus; a2, B2 and C2-three phase lines of a low-voltage B-section bus; n2-neutral line of the low-voltage B section bus; l-live line of the control bus; n-zero line of control bus; q1-buscouple breaker; q01 — first breaker; q02-second breaker; KM 01-voltage ac contactor; t-control the transformer; q11, Q12, \ 8230;, Q1 n-third circuit breaker; 1,2, \ 8230;, n-control power supply.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be noted that the drawings are in a very simplified form and are all drawn to a non-precise scale for the purpose of convenience and clarity only to aid in the description of the embodiments of the invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, proportions, sizes, and other elements shown in the drawings and described herein are illustrative only and are not intended to limit the scope of the invention, which is to be given the full breadth of the appended claims and any and all modifications, equivalents, and alternatives to those skilled in the art should be construed as falling within the spirit and scope of the invention.
As used in this application, 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 a sense including "two or more" unless the content clearly dictates otherwise. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of the features.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be a mechanical connection or a communication connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, fig. 1 is a schematic diagram of a connection circuit of a control power supply of a low-voltage bus bar connection cabinet according to an embodiment of the present invention. The embodiment provides a leading circuit of a low-voltage bus connection cabinet control power supply, which comprises a low-voltage A section bus, a low-voltage B section bus, a bus coupler circuit breaker Q1, a first circuit breaker Q01, a second circuit breaker Q02, a low-voltage alternating current contactor KM01, a control transformer T, a control bus, a plurality of third circuit breakers and a plurality of control power supplies, wherein the low-voltage A section bus, the low-voltage B section bus, the bus coupler circuit breaker Q1, the first circuit breaker Q01, the second circuit breaker Q02, the low-voltage alternating current contactor KM01, the control transformer T, the control bus, the plurality of third circuit breakers and the plurality of control power supplies are connected in series;
the bus coupler 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 breaker Q01 and the upper port of the second breaker Q02 are respectively connected to the lower port and the upper port of the female coupling 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, 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 invention is as follows:
when the low-voltage A section bus and the low-voltage B section bus are normally powered on, 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 to the control transformer T, the control transformer T supplies power to the control bus after isolation and transformation of the control transformer T, and then the control power supply is supplied with power through the third circuit breaker; when the low-voltage section A bus is normally powered on and the low-voltage section B bus is not powered on, the control coil of the low-voltage alternating current contactor KM01 is powered on through the first breaker Q01, so that the two groups of normally closed main contacts are disconnected, the two groups of normally open main contacts are closed and supply power to the control transformer T, the control transformer T supplies power to the control bus after isolation and transformation, and then the control power supply is supplied with power through the third breaker; when low pressure A section generating line loses the electricity just when low pressure B section generating line normally receives the electricity, low pressure ac contactor KM 01's control coil loses the electricity, makes two sets of normally open main contact disconnection, two sets of normally closed main contact is closed and does control transformer T supplies power, the warp control transformer T keeps apart after the vary voltage power supply give the control generating line, and then passes through the third circuit breaker does the control power supply supplies power. Second circuit breaker Q02 this application is through following the control power supply of the same kind is drawn respectively to the both ends of female circuit breaker Q1 that allies oneself with, and passes through low pressure ac contactor KM01 realizes the automatic switch-over of two way control power supplies and locks each other, compares in the scheme that traditional unilateral from female circuit breaker Q1 that allies oneself with draws control power supply of the same kind, 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 configured to control on/off of the bus tie breaker Q1. It should be understood that, to the scheme that traditional unilateral from female antithetical couplet circuit breaker Q1 draws and connects control power supply all the way, when being drawn and connect the sectional bus and can't normally receive the electricity, though can be through closing female antithetical couplet circuit breaker Q1 supplies power, because female antithetical couplet circuit breaker Q1 relies on control power to carry out remote control, under the circumstances that control power can't get the electricity, then need manual closure female antithetical couplet circuit breaker Q1, the time that from this consumes is uncontrollable, and more troublesome.
In this embodiment, the low-voltage section a bus and the low-voltage section B bus are segmented buses of the same main bus.
In this embodiment, the low-voltage section a bus and the low-voltage section B bus are both a three-phase four-wire system or a three-phase three-wire system. In this embodiment, low pressure a section generating line with low pressure B section generating line is three-phase four-wire system, low pressure a section generating line comprises three phase lines A1, B1, C1 and neutral conductor N1, low pressure B section generating line comprises three phase lines A2, B2, C2 and neutral conductor N2. L and N in fig. 1 represent the live and neutral wires, respectively, of the control bus.
Preferably, the access phase sequence of the upper port of the first breaker Q01 is consistent with that of the upper port of the second breaker Q02, so as to avoid the influence of control loop faults on a main bus. For example, if the phase sequence A1 and C1 are connected to the upper port of the first breaker Q01, the phase sequence A2 and C2 must be connected to the upper port of the second breaker Q02, but not C2 and A2 or other connection methods.
In this embodiment, the voltages on the low-voltage segment a bus and the low-voltage segment 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 and matched according to the using environment and the current size, which is not specifically limited in this application.
Preferably, first circuit breaker Q01 with the second circuit breaker Q02's the biggest short circuit breaking current with low pressure A section generating line with the short-circuit current phase-match of low pressure B section generating line avoids when first circuit breaker Q01 or when the lower mouthful of second circuit breaker Q02 short circuit trouble takes place, first circuit breaker Q01 with second circuit breaker Q02 can't normally break off because of the undersize of the biggest short circuit breaking current, perhaps directly burns out the circuit breaker, enlarges fault range.
In this embodiment, the control transformer T converts 400V to 220V to supply the control power.
The third circuit breakers are the same in number with the control power supplies and correspond to the control power supplies one by one. In this embodiment, the third circuit breakers Q11, Q12, \8230, Q1n correspond to the control power supplies 1,2, \8230, n, respectively, 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 elements on other control loops besides controlling on/off of the bus-tie breaker Q1, which is not limited in this application.
To sum up, the embodiment of the invention provides a leading circuit of a control power supply of a low-voltage bus connection cabinet, wherein one path of control power supply is respectively led from two ends of a bus-coupled circuit breaker Q1, and automatic switching and mutual locking of two paths of control power supplies are realized through a low-voltage alternating current contactor KM 01.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention also include such modifications and variations as come within the scope of the invention and their equivalents.
Claims (10)
1. A leading circuit of a control power supply of a low-voltage bus connection cabinet is characterized by comprising a low-voltage A section bus, a low-voltage B section bus, a bus connection breaker, a first breaker, a second breaker, a low-voltage alternating current contactor, a control transformer, a control bus, a plurality of third breakers and a plurality of control power supplies, wherein the low-voltage A section bus, the low-voltage B section bus, the bus connection breaker, the first breaker, the second breaker, the low-voltage alternating current contactor, the control transformer, the control bus, the plurality of third breakers and the plurality of control power supplies are arranged in the control power supply;
the bus coupler 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-coupled 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, 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 leading circuit of the low-voltage bus bar connection cabinet control power supply as claimed in claim 1, wherein the low-voltage A section bus bar and the low-voltage B section bus bar are segmented bus bars of the same main bus bar.
3. The leading circuit of the low-voltage bus bar connection cabinet control power supply as claimed in claim 1 or 2, wherein the low-voltage A section bus bar and the low-voltage B section bus bar are both three-phase four-wire system or three-phase three-wire system.
4. The leading circuit of low voltage bus tie cabinet control power supply of claim 3, wherein the access phase sequence of the upper port of the first breaker and the upper port of the second breaker is consistent.
5. The leading circuit of low-voltage bus bar connection cabinet control power supply of claim 3, wherein the voltage on the low-voltage A section bus bar and the low-voltage B section bus bar are both 400V.
6. The low voltage busway cabinet control power supply tapping circuit of claim 5, wherein said control coil is rated at 380V.
7. The low voltage bus tie cabinet control power supply lead circuit of claim 1, wherein the buscouple circuit breaker is a frame circuit breaker.
8. The low voltage busway cabinet control power supply grounding circuit of claim 1, wherein the first circuit breaker and the second circuit breaker are molded case circuit breakers.
9. The leading circuit of the low-voltage bus bar connection cabinet control power supply as claimed in claim 1 or 8, wherein the maximum short-circuit breaking current of the first circuit breaker and the second circuit breaker is matched with the short-circuit breaking current of the low-voltage A section bus bar and the low-voltage B section bus bar.
10. The low voltage bus tie cabinet control power supply tapping circuit of claim 1, wherein the third circuit breaker is a miniature circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211623677.1A CN115833614A (en) | 2022-12-16 | 2022-12-16 | Leading circuit of low-voltage bus connection cabinet control power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211623677.1A CN115833614A (en) | 2022-12-16 | 2022-12-16 | Leading circuit of low-voltage bus connection cabinet control power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115833614A true CN115833614A (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211623677.1A Pending CN115833614A (en) | 2022-12-16 | 2022-12-16 | Leading circuit of low-voltage bus connection cabinet control power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115833614A (en) |
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2022
- 2022-12-16 CN CN202211623677.1A patent/CN115833614A/en active Pending
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