CN221380617U

CN221380617U - Four-inlet-wire three-bus-connection electric interlocking system and low-voltage power distribution system

Info

Publication number: CN221380617U
Application number: CN202323344743.4U
Authority: CN
Inventors: 欧阳萍; 唐非凡; 厉复新; 杨圣彬; 王伯鹏; 李金辉; 袁丽丹
Original assignee: Tbea Yunji Electric Co ltd
Current assignee: Tbea Yunji Electric Co ltd
Priority date: 2023-12-07
Filing date: 2023-12-07
Publication date: 2024-07-19
Anticipated expiration: 2033-12-07

Abstract

The utility model discloses a four-wire three-bus electrical interlocking system and a low-voltage power distribution system, and relates to the technical field of electrical control. Four inlet wire three female electrical interlock system include four inlet wire three female electrical interlock system, include: the first incoming line circuit breaker, the second incoming line circuit breaker, the third incoming line circuit breaker, the fourth incoming line circuit breaker, the first bus-tie circuit breaker, the second bus-tie circuit breaker and the third bus-tie circuit breaker. Normally-closed contacts corresponding to the first incoming circuit breaker, the second incoming circuit breaker, the third incoming circuit breaker and the fourth incoming circuit breaker are respectively connected in series in a closing coil loop of the first bus-bar circuit breaker, the second bus-bar circuit breaker and the third bus-bar circuit breaker according to specific series-parallel combination. The utility model solves the technical problem of complicated wiring of four-wire three-bus-bar electrical interlocking in the related art, and realizes the interlocking control of each wire-inlet circuit breaker and each bus-bar circuit breaker in the power supply switching process.

Description

Four-inlet-wire three-bus-connection electric interlocking system and low-voltage power distribution system

Technical Field

The utility model relates to the technical field of electrical control, in particular to a four-inlet three-bus electrical interlocking system and a low-voltage distribution system.

Background

Along with the continuous construction of a power grid, the continuous increase of load power consumption demands, and the application of the multi-power supply technology is gradually wide. In a low-voltage power distribution system powered by multiple power supplies, in order to ensure continuous supply of the power supplies, four-inlet-wire one-bus-connection, four-inlet-wire three-bus-connection and other electric interlocking schemes gradually appear. However, in the related art, the wiring of the four-wire three-bus electrical interlocking is complicated, once an error occurs during switching between power supplies, the electrical interlocking will fail, and asynchronous parallel accidents caused by parallel of multiple power supplies, reverse power transmission to different power supply paths and the like will cause harm to human bodies, equipment and power grids.

Disclosure of utility model

The utility model mainly aims to provide a four-wire three-bus-bar electric interlocking system and a low-voltage power distribution system, and aims to solve the technical problem that wiring of the four-wire three-bus-bar electric interlocking system in the related art is complicated.

In order to achieve the above purpose, the present utility model provides a four-wire three-bus electrical interlocking system, the four-wire three-bus electrical interlocking system comprising:

The device comprises a first incoming line breaker connected between a first transformer and a first bus, a second incoming line breaker connected between a second transformer and a second bus, a third incoming line breaker connected between a third transformer and a third bus, a fourth incoming line breaker connected between a fourth transformer and a fourth bus, a first bus-bar breaker connected between the first bus and the second bus, a second bus-bar breaker connected between the second bus and the third bus, and a third bus-bar breaker connected between the third bus and the fourth bus;

The first transformer, the second transformer, the third transformer and the fourth transformer are respectively connected with four paths of mains supply incoming lines in a one-to-one correspondence manner; the first bus, the second bus, the third bus and the fourth bus are respectively connected with a load;

The normally-closed contact of the second incoming line breaker and the normally-closed contact of the second bus-bar breaker are connected in series to form a first series loop, and the first series loop is connected in parallel with the normally-closed contact of the first incoming line breaker and then is connected in series in a closing coil loop of the first bus-bar breaker;

The normally closed contact of the second incoming line breaker and the normally closed contact of the first bus-tie breaker are connected in series to form a second series loop, the normally closed contact of the third incoming line breaker and the normally closed contact of the third bus-tie breaker are connected in series to form a third series loop, and the second series loop and the third series loop are connected in parallel and then connected in series in a closing coil loop of the second bus-tie breaker;

the normally closed contact of the third incoming line breaker and the normally closed contact of the second bus-bar breaker are connected in series to form a fourth series loop, and the fourth series loop is connected in parallel with the normally closed contact of the fourth incoming line breaker and then is connected in series in a closing coil loop of the third bus-bar breaker.

Optionally, the normally closed contact of the second bus-tie breaker is connected in series in a closing coil loop of the third incoming line breaker;

The normally closed contact of the third bus-bar circuit breaker is connected in series in a closing coil loop of the fourth incoming line circuit breaker.

Optionally, the normally closed contact of the second busbar breaker is connected in series in a closing coil loop of the second incoming line breaker;

The normally closed contact of the first bus-bar circuit breaker is connected in series in a closing coil loop of the first incoming line circuit breaker.

Optionally, after the normally closed contact of the first bus-tie breaker is connected in series with the normally closed contact of the second bus-tie breaker, the normally closed contact of the first bus-tie breaker is connected in series in a closing coil loop of the second incoming line breaker;

The normally-closed contact of the second bus-tie breaker is connected in series with the normally-closed contact of the third bus-tie breaker and then is connected in series in a closing coil loop of the third incoming line breaker;

Optionally, the normally closed contact of the first busbar breaker is connected in series in a closing coil loop of the first incoming line breaker;

the normally-closed contact of the first bus-tie circuit breaker is connected in series with the normally-closed contact of the second bus-tie circuit breaker and then is connected in series in a closing coil loop of the second incoming circuit breaker;

and after the normally-closed contact of the second bus-tie breaker is connected in series with the normally-closed contact of the third bus-tie breaker, the normally-closed contact of the second bus-tie breaker is connected in series in a closing coil loop of the third incoming line breaker.

The utility model also provides a low-voltage power distribution system which comprises the four-inlet three-bus-bar electric interlocking system.

Optionally, the low voltage power distribution system further comprises:

four mains supply incoming lines which are respectively connected with the first transformer, the second transformer, the third transformer and the fourth transformer;

And the load is respectively connected with the first bus, the second bus, the third bus and the fourth bus.

The four-inlet three-bus electrical interlocking system provided by the technical scheme of the utility model comprises: the first incoming line circuit breaker, the second incoming line circuit breaker, the third incoming line circuit breaker, the fourth incoming line circuit breaker, the first bus-tie circuit breaker, the second bus-tie circuit breaker and the third bus-tie circuit breaker. Normally-closed contacts corresponding to the first incoming circuit breaker, the second incoming circuit breaker, the third incoming circuit breaker and the fourth incoming circuit breaker are respectively connected in series in a closing coil loop of the first bus-bar circuit breaker, the second bus-bar circuit breaker and the third bus-bar circuit breaker according to specific series-parallel combination, so that interlocking control of each incoming circuit breaker and each bus-bar circuit breaker in the power supply switching process is realized. Therefore, the utility model realizes a plurality of electrical interlocking control modes of the four-inlet three-bus low-voltage distribution system through simple interlocking wiring.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a primary circuit of a first embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 2 is a schematic diagram of a control loop of a first embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 3 is a schematic diagram of a control loop of a second embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 4 is a schematic diagram of a control loop of a third embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 5 is a schematic diagram of a control loop of a fourth embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 6 is a schematic diagram of a control loop of a fifth embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 7 is a schematic diagram of a control loop of a sixth embodiment of a four-wire, three-bus electrical interlock system according to the present utility model;

FIG. 8 is a schematic diagram of a control loop of a seventh embodiment of a four-wire, three-bus electrical interlock system of the present utility model;

FIG. 9 is a schematic diagram of a control loop of an eighth embodiment of a four-wire, three-bus electrical interlock system according to the present utility model;

Fig. 10 is a diagram showing the relationship between the switch positions of a circuit breaker in an eighth embodiment of the four-wire three-bus electrical interlock system of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is 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" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, fig. 1 is a schematic diagram of a primary circuit of a first embodiment of a four-wire, three-bus electrical interlock system of the present utility model.

As shown in fig. 1, in this embodiment, the four-wire three-bus electrical interlock system may include: the first wire inlet breaker QF1, the second wire inlet breaker QF2, the third wire inlet breaker QF3, the fourth wire inlet breaker QF4, the first busbar breaker QF12, the second busbar breaker QF23 and the third busbar breaker QF34.

Wherein, QF1 connects between first transformer T1 and first busbar M1, QF2 connects between second transformer T2 and second busbar M2, QF3 connects between third transformer T3 and third busbar M3, QF4 connects between fourth transformer T4 and fourth busbar M4, QF12 connects between first busbar M1 and second busbar M2, QF23 connects between second busbar M2 and third busbar M3, QF34 connects between third busbar M3 and fourth busbar M4. The first transformer T1, the second transformer T2, the third transformer T3 and the fourth transformer T4 are respectively connected with four paths of mains supply incoming lines in a one-to-one correspondence manner, and the first bus M1, the second bus M2, the third bus M3 and the fourth bus M4 are respectively connected with corresponding loads.

Further, referring to fig. 2, fig. 2 is a schematic diagram of a control circuit of a first embodiment of the four-wire three-bus electrical interlock system of the present utility model. As shown in fig. 2, the normally closed contact QF2B of QF2 and the normally closed contact QF23B of QF23 are connected in series to form a first series loop, and the first series loop is connected in parallel with the normally closed contact QF1B of QF1 and then connected in series in the closing coil loop of QF 12; the normally closed contact QF2B of QF2 and the normally closed contact QF12B of QF12 are connected in series to form a second series loop, the normally closed contact QF3B of QF3 and the normally closed contact QF34B of QF34 are connected in series to form a third series loop, and the second series loop and the third series loop are connected in parallel and then are connected in series in a closing coil loop of QF 23; the normally closed contact QF3B of QF3 and the normally closed contact QF23B of QF23 are connected in series to form a fourth series loop, and the fourth series loop is connected in parallel with the normally closed contact QF4B of QF4 and then is connected in series in the closing coil loop of QF 34.

It can be understood that the circuit breaker and the corresponding normally closed contacts are interlocked with each other, and when the circuit breaker performs opening and closing actions, the on-off state of the corresponding normally closed contacts also changes along with the actions of the circuit breaker. Specifically, when the circuit breaker is in a closing state, the corresponding normally-closed contact is not conducted, and when the circuit breaker is in a breaking state, the corresponding normally-closed contact is conducted. Therefore, the normally closed contact can be used as a switching-on/off signal of a corresponding breaker and connected into a control loop of other breakers, so that interlocking control among a plurality of breakers is realized.

In addition, each circuit breaker is provided with a closing coil loop, the closing coil loop is a closing control loop of the circuit breaker, and when the closing coil loop is completely closed, the corresponding circuit breaker can be manually closed.

Specifically, in this embodiment, when the low-voltage power distribution system is in a normal operation state, the four transformers supply power to the corresponding bus bars independently. That is, QF1, QF2, QF3, and QF4 are in the on state, QF12, QF23, and QF34 are in the off state, the first transformer T1 supplies power to the load on the first busbar M1, the second transformer T2 supplies power to the load on the second busbar M2, the third transformer T3 supplies power to the load on the third busbar M3, and the fourth transformer T4 supplies power to the load on the fourth busbar M4.

When the low-voltage power distribution system is changed from a normal state to a state of 'power supply of the first transformer T1 and the third transformer T3 and power failure of the second transformer T2 and the fourth transformer T4', the QF1 and the QF3 keep the switching-on state unchanged, and the QF2 and the QF4 are switched off. After QF2 and QF4 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 2, the normally closed contact QF2B of QF2 is connected in series in the closing coil circuit of QF12, and QF12 can be manually closed as the normally closed contact QF2B of QF2 changes from the open state to the closed state, and the closing coil circuit of QF12 changes to the closed state; the normally closed contact QF4B of the QF4 is connected in series in the closing coil loop of the QF34, and as the normally closed contact QF4B of the QF4 changes from an open state to a closed state, the closing coil loop of the QF34 changes to a closed state, and the QF34 can be manually closed; the normally closed contacts QF12B and QF34B of the QF12 normally closed contacts QF12B and QF34 are connected in series in the closing coil loop of the QF23, and as the QF12 and the QF34 are changed into the closing state, the corresponding normally closed contacts are disconnected, and the closing coil loop of the QF23 continues to be kept in the disconnection state, so that the QF23 cannot be manually closed. At this time, the QF12 communicates with the first bus bar M1 and the second bus bar M2, the first transformer T1 simultaneously supplies power to the loads on the first bus bar M1 and the second bus bar M2, the QF34 communicates with the third bus bar M3 and the fourth bus bar M4, and the third transformer T3 simultaneously supplies power to the loads on the third bus bar M3 and the fourth bus bar M4.

When the low-voltage power distribution system is changed from a normal state to a state of 'power supply of the second transformer T2 and the fourth transformer T4 and power failure of the first transformer T1 and the third transformer T3', the QF2 and the QF4 keep a switching-on state unchanged, and the QF1 and the QF3 are switched off. After the QF1 and the QF3 are changed into the opening state, the corresponding normally-closed contacts are changed into the closing state from the opening state, and as can be seen from fig. 2, the normally-closed contacts QF1B of the QF1 are connected in series in the closing coil circuit of the QF12, and as the normally-closed contacts QF1B of the QF1 are changed into the closing state from the opening state, the closing coil circuit of the QF12 is changed into the closing state, and the QF12 can be manually closed; the normally closed contact QF3B of the QF3 is connected in series in the closing coil loop of the QF34, and as the normally closed contact QF3B of the QF3 changes from an open state to a closed state, the closing coil loop of the QF34 changes to a closed state, and the QF34 can be manually closed; the normally closed contacts QF12B and QF34B of the QF12 are connected in series in the closing coil circuit of the QF23, and as the QF12 and the QF34 are changed into the closing state, the corresponding normally closed contacts are opened, and the closing coil circuit of the QF23 continues to maintain the opened state, so that the QF23 cannot be manually closed. At this time, the QF12 communicates with the first bus bar M1 and the second bus bar M2, the second transformer T2 simultaneously supplies power to the loads on the first bus bar M1 and the second bus bar M2, the QF34 communicates with the third bus bar M3 and the fourth bus bar M4, and the fourth transformer T4 simultaneously supplies power to the loads on the third bus bar M3 and the fourth bus bar M4.

Furthermore, the normally closed contacts QF23B of the QF23 are simultaneously connected in series in the closing coil loop of the QF12 and the closing coil loop of the QF34, and the normally closed contacts QF23B of the QF23 are used for interlocking the QF12 and the QF34, so that asynchronous parallel accidents caused by parallel power supply of transformers at two sides of the QF23 can be avoided.

The four inlet wires three female electrical interlocking system that allies oneself with that this embodiment provided includes: the first incoming line circuit breaker, the second incoming line circuit breaker, the third incoming line circuit breaker, the fourth incoming line circuit breaker, the first bus-tie circuit breaker, the second bus-tie circuit breaker and the third bus-tie circuit breaker. Normally-closed contacts corresponding to the first incoming circuit breaker, the second incoming circuit breaker, the third incoming circuit breaker and the fourth incoming circuit breaker are respectively connected in series in a closing coil loop of the first bus-bar circuit breaker, the second bus-bar circuit breaker and the third bus-bar circuit breaker according to specific series-parallel combination, so that interlocking control of each incoming circuit breaker and each bus-bar circuit breaker in the power supply switching process is realized. Therefore, the utility model realizes a plurality of electrical interlocking control modes of the four-inlet three-bus low-voltage distribution system through simple interlocking wiring. Therefore, the complexity of the electric interlocking wiring is reduced, the manufacturing cost is greatly reduced, and the safety and the reliability of the electric power system are ensured.

Further, a second embodiment is proposed based on the first embodiment, referring to fig. 3, fig. 3 is a schematic diagram of a control circuit of the second embodiment of the four-wire three-bus electrical interlocking system of the present utility model.

As shown in fig. 3, in the present embodiment, the normally closed contact QF23B of QF23 is connected in series in the closing coil circuit of QF 3; the normally closed contact QF34B of QF34 is connected in series in the closing coil circuit of QF 4.

Specifically, when the low-voltage power distribution system is changed from the normal state to the state of 'the first transformer T1 and the second transformer T2 supplying power and the third transformer T3 and the fourth transformer T4 cutting off power', the QF1 and the QF2 keep the on state unchanged, and the QF3 and the QF4 are disconnected. After QF3 and QF4 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 3, the normally closed contact QF3B of QF3 is connected in series in the closing coil circuit of QF23, and QF23 can be manually closed as the normally closed contact QF3B of QF3 changes from the open state to the closed state, and the closing coil circuit of QF23 changes to the closed state; the normally closed contact QF4B of the QF4 is connected in series in the closing coil loop of the QF34, and as the normally closed contact QF4B of the QF4 changes from an open state to a closed state, the closing coil loop of the QF34 changes to a closed state, and the QF34 can be manually closed; the normally closed contacts QF1B and QF2B of the QF1 normally closed contacts QF1B and QF2 are connected in series in the closing coil loop of the QF23, the QF1 and QF2 are in a closing state and kept unchanged, the corresponding normally closed contacts are in an opening state, and the closing coil loop of the QF12 is kept in an opening state, so that the QF12 cannot be manually closed. At this time, the QF23 is connected to the second bus bar M2 and the third bus bar 3, the QF34 is connected to the third bus bar M3 and the fourth bus bar M4, the second transformer T2 simultaneously supplies power to the loads on the second bus bar M2, the third bus bar M3 and the fourth bus bar M4, and the first transformer T1 separately supplies power to the loads on the first bus bar M1.

Furthermore, when the third transformer T3 meets the power supply condition again, the QF23 can be subjected to the opening operation, so that the QF3 meets the closing condition again. Specifically, as can be seen from fig. 3, the normally closed contact QF23B of the QF23 is connected in series to the closing coil circuit of the QF3, and the QF3 can be manually closed as the QF23 is changed from the closed state to the open state, and the normally closed contact QF23B of the QF23 is changed from the open state to the closed state. When the fourth transformer T4 meets the power supply condition again, the QF34 can be subjected to the opening operation, so that the QF4 meets the closing condition again. Specifically, as can be seen from fig. 3, the normally closed contact QF34B of the QF34 is connected in series to the closing coil circuit of the QF4, and the QF4 can be manually closed as the QF34 is changed from the closed state to the open state, and the normally closed contact QF34B of the QF34 is changed from the open state to the closed state, and the closing coil circuit of the QF4 is changed to the closed state.

In the present embodiment, the normal-close contacts QF23B of the QF23 and the normal-close contacts QF34B of the QF34 are used to interlock the QF3 and the QF4, respectively, so that the interlocking control during the switching process between the normal state and the states of the first transformer T1 and the second transformer T2, and the third transformer T3 and the fourth transformer T4 are powered off is realized.

Further, a third embodiment is proposed based on the first embodiment, referring to fig. 4, fig. 4 is a schematic diagram of a control circuit of the third embodiment of the four-wire three-bus electrical interlocking system according to the present utility model.

As shown in fig. 4, in the present embodiment, the normally closed contact QF23B of QF23 is connected in series in the closing coil circuit of QF 2; the normally closed contact QF12B of QF12 is connected in series in the closing coil circuit of QF 1.

Specifically, when the low-voltage power distribution system is changed from the normal state to the state of 'third transformer T3 and fourth transformer T4 powered by first transformer T1 and second transformer T2 powered off', QF3 and QF4 remain in the closed state, and QF1 and QF2 are opened. After QF1 and QF2 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 4, the normally closed contact QF2B of QF2 is connected in series in the closing coil circuit of QF23, and QF23 can be manually closed as the normally closed contact QF2B of QF2 changes from the open state to the closed state, and the closing coil circuit of QF23 changes to the closed state; the normally closed contact QF1B of the QF1 is connected in series in the closing coil loop of the QF12, and as the normally closed contact QF1B of the QF1 changes from an open state to a closed state, the closing coil loop of the QF12 changes to a closed state, and the QF12 can be manually closed; the normally closed contacts QF3B and QF4B of the QF3 normally closed contacts QF3B and QF4 are connected in series in the closing coil loop of the QF23, the QF3 and QF4 are in a closing state and kept unchanged, the corresponding normally closed contacts are in an opening state, and the closing coil loop of the QF34 is kept in an opening state, so that the QF34 cannot be manually closed. At this time, the QF23 is connected to the second bus bar M2 and the third bus bar 3, the QF12 is connected to the first bus bar M1 and the second bus bar M2, the third transformer T3 simultaneously supplies power to the loads on the first bus bar M1, the second bus bar M2 and the third bus bar M3, and the fourth transformer T4 separately supplies power to the loads on the fourth bus bar M4.

Furthermore, when the second transformer T2 meets the power supply condition again, the QF23 can be subjected to the opening operation, so that the QF2 meets the closing condition again. Specifically, as can be seen from fig. 4, the normally closed contact QF23B of the QF23 is connected in series to the closing coil circuit of the QF2, and the QF2 can be manually closed as the QF23 is changed from the closed state to the open state, and the normally closed contact QF23B of the QF23 is changed from the open state to the closed state, and the closing coil circuit of the QF2 is changed to the closed state.

When the first transformer T1 meets the power supply condition again, the QF12 can be subjected to the opening operation, so that the QF1 meets the closing condition again. Specifically, as can be seen from fig. 4, the normally closed contact QF12B of the QF12 is connected in series to the closing coil circuit of the QF1, and the QF1 can be manually closed as the QF12 is changed from the closed state to the open state, and the normally closed contact QF12B of the QF12 is changed from the open state to the closed state, and the closing coil circuit of the QF1 is changed to the closed state.

In the present embodiment, the normal-close contacts QF23B of the QF23 and the normal-close contacts QF12B of the QF12 are used to interlock the QF2 and the QF1, respectively, so that the interlocking control in the switching process between the normal state and the states of the third transformer T3 and the fourth transformer T4, the first transformer T1 and the second transformer T2, and the power failure, of the low-voltage distribution system is realized.

Further, a fourth embodiment is proposed based on the first embodiment, referring to fig. 5, fig. 5 is a schematic diagram of a control circuit of a fourth embodiment of the four-wire three-bus electrical interlock system according to the present utility model.

As shown in fig. 5, in the present embodiment, after the normally closed contact QF12B of the QF12 and the normally closed contact QF23B of the QF23 are connected in series, they are connected in series in the closing coil circuit of the QF 2; after being connected in series with the normally closed contact QF23B of QF23 and the normally closed contact QF34B of QF34, the normally closed contact QF23B is connected in series in a closing coil loop of QF 3; the normally closed contact QF34B of QF34 is connected in series in the closing coil circuit of QF 4.

Specifically, when the low-voltage power distribution system is changed from the normal state to the state of "the first transformer T1 supplies power, the second transformer T2, the third transformer T3, and the fourth transformer T4 are powered off", the QF1 maintains the on state unchanged, and the QF2, QF3, and QF4 are disconnected. After QF2, QF3 and QF4 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 5, the normally closed contact QF2B of QF2 is connected in series in the closing coil circuit of QF12, and QF12 can be manually closed as the normally closed contact QF2B of QF2 changes from the open state to the closed state, and the closing coil circuit of QF12 changes to the closed state; the normally closed contact QF3B of the QF3 is connected in series in the closing coil loop of the QF23, and as the normally closed contact QF3B of the QF3 changes from an open state to a closed state, the closing coil loop of the QF23 changes to a closed state, and the QF23 can be manually closed; the normally closed contact QF4B of the QF4 is connected in series in the closing coil loop of the QF34, and as the normally closed contact QF4B of the QF4 changes from an open state to a closed state, the closing coil loop of the QF34 changes to a closed state, and the QF34 can be manually closed. At this time, the QF12 communicates with the first bus bar M1 and the second bus bar 2, the QF23 communicates with the second bus bar M2 and the third bus bar M3, the QF34 communicates with the third bus bar M3 and the fourth bus bar M4, and the first transformer T1 simultaneously supplies power to the loads on the first bus bar M1, the second bus bar M2, the third bus bar M3 and the fourth bus bar M4.

Further, when the fourth transformer T4 meets the power supply condition again, the QF34 may be subjected to the opening operation, so that the QF4 meets the closing condition again. Specifically, as can be seen from fig. 5, the normally closed contact QF34B of the QF34 is connected in series to the closing coil circuit of the QF4, and the QF4 can be manually closed as the QF34 is changed from the closed state to the open state, and the normally closed contact QF34B of the QF34 is changed from the open state to the closed state, and the closing coil circuit of the QF4 is changed to the closed state. On the basis, if the third transformer T3 meets the power supply condition again, the QF23 can be subjected to opening operation, so that the QF3 meets the closing condition again. Specifically, as can be seen from fig. 5, the normally closed contact QF23B of the QF23 is connected in series to the closing coil circuit of the QF3, and the QF3 can be manually closed as the QF23 is changed from the closed state to the open state, and the normally closed contact QF23B of the QF23 is changed from the open state to the closed state. On the basis, if the second transformer T2 meets the power supply condition again, the QF12 can be subjected to opening operation, so that the QF2 meets the closing condition again. Specifically, as can be seen from fig. 5, the normally closed contact QF12B of the QF12 is connected in series to the closing coil circuit of the QF2, and the QF2 can be manually closed as the QF12 is changed from the closed state to the open state, and the normally closed contact QF12B of the QF12 is changed from the open state to the closed state, and the closing coil circuit of the QF2 is changed to the closed state.

In the present embodiment, the series combination of the normally-closed contact QF23B of the QF23 and the normally-closed contact QF34B of the QF34 is used for interlocking the QF3, and the normally-closed contact QF34B of the QF34 is used for interlocking the QF4, so that the interlocking control in the switching process between the normal state and the state of the first transformer T1, the second transformer T2, the third transformer T3 and the fourth transformer T4 is realized.

Further, a fifth embodiment is proposed based on the first embodiment, referring to fig. 6, fig. 6 is a schematic diagram of a control circuit of the fifth embodiment of the four-wire three-bus electrical interlock system according to the present utility model.

As shown in fig. 6, in the present embodiment, a normally closed contact QF12B of QF12 is connected in series in the closing coil circuit of QF 1; after being connected in series with the normally closed contact QF23B of QF23 and the normally closed contact QF34B of QF34, the normally closed contact QF23B is connected in series in a closing coil loop of QF 3; the normally closed contact QF34B of QF34 is connected in series in the closing coil circuit of QF 4.

Specifically, when the low-voltage power distribution system is changed from the normal state to the state of "the second transformer T2 supplies power, the first transformer T1, the third transformer T3, and the fourth transformer T4 are powered off", the QF2 maintains the on state unchanged, and the QF1, QF3, and QF4 are disconnected. After QF1, QF3 and QF4 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 6, the normally closed contact QF1B of QF1 is connected in series in the closing coil circuit of QF12, and QF12 can be manually closed as the normally closed contact QF1B of QF1 changes from the open state to the closed state, and the closing coil circuit of QF12 changes to the closed state; the normally closed contact QF3B of the QF3 is connected in series in the closing coil loop of the QF23, and as the normally closed contact QF3B of the QF3 changes from an open state to a closed state, the closing coil loop of the QF23 changes to a closed state, and the QF23 can be manually closed; the normally closed contact QF4B of the QF4 is connected in series in the closing coil loop of the QF34, and as the normally closed contact QF4B of the QF4 changes from an open state to a closed state, the closing coil loop of the QF34 changes to a closed state, and the QF34 can be manually closed. At this time, the QF12 communicates with the first bus bar M1 and the second bus bar 2, the QF23 communicates with the second bus bar M2 and the third bus bar M3, the QF34 communicates with the third bus bar M3 and the fourth bus bar M4, and the second transformer T2 simultaneously supplies power to the loads on the first bus bar M1, the second bus bar M2, the third bus bar M3 and the fourth bus bar M4.

Furthermore, when the first transformer T1 meets the power supply condition again, the QF12 can be subjected to the opening operation, so that the QF1 meets the closing condition again. Specifically, as can be seen from fig. 6, the normally closed contact QF12B of the QF12 is connected in series to the closing coil circuit of the QF1, and the QF1 can be manually closed as the QF12 is changed from the closed state to the open state, and the normally closed contact QF12B of the QF12 is changed from the open state to the closed state, and the closing coil circuit of the QF1 is changed to the closed state.

When the fourth transformer T4 meets the power supply condition again, the QF34 can be subjected to the opening operation, so that the QF4 meets the closing condition again. Specifically, as can be seen from fig. 6, the normally closed contact QF34B of the QF34 is connected in series to the closing coil circuit of the QF4, and the QF4 can be manually closed as the QF34 is changed from the closed state to the open state, and the normally closed contact QF34B of the QF34 is changed from the open state to the closed state, and the closing coil circuit of the QF4 is changed to the closed state. On the basis, if the third transformer T3 meets the power supply condition again, the QF23 can be subjected to opening operation, so that the QF3 meets the closing condition again. Specifically, as can be seen from fig. 6, the normally closed contact QF23B of the QF23 is connected in series to the closing coil circuit of the QF3, and the QF3 can be manually closed as the QF23 is changed from the closed state to the open state, and the normally closed contact QF23B of the QF23 is changed from the open state to the closed state.

In the embodiment, the normal close contact QF12B of the QF12 is used for interlocking the QF1, the normal close contact QF23B of the QF23 is used for interlocking the QF3 through the series combination of the normal close contact QF34B of the QF34, and the normal close contact QF34B of the QF34 is used for interlocking the QF4, so that the interlocking control in the switching process between the normal state and the state of the second transformer T2, wherein the first transformer T1, the third transformer T3 and the fourth transformer T4 are powered off, is realized.

Further, a sixth embodiment is proposed based on the first embodiment, referring to fig. 7, fig. 7 is a schematic diagram of a control circuit of a sixth embodiment of the four-wire three-bus electrical interlock system according to the present utility model.

As shown in fig. 7, in the present embodiment, a normally closed contact QF12B of QF12 is connected in series in the closing coil circuit of QF 1; after being connected in series with the normally closed contact QF23B of QF23, the normally closed contact QF12B of QF12 is connected in series in a closing coil loop of QF 2; the normally closed contact QF34B of QF34 is connected in series in the closing coil circuit of QF 4.

Specifically, when the low-voltage power distribution system is changed from the normal state to the state of 'third transformer T3 supplying power, first transformer T1, second transformer T2 and fourth transformer T4 having power failure', QF3 keeps the on state unchanged, and QF1, QF2 and QF4 are disconnected. After QF1, QF2 and QF4 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 7, the normally closed contact QF1B of QF1 is connected in series in the closing coil circuit of QF12, and QF12 can be manually closed as the normally closed contact QF1B of QF1 changes from the open state to the closed state, and the closing coil circuit of QF12 changes to the closed state; the normally closed contact QF2B of the QF2 is connected in series in the closing coil loop of the QF23, and as the normally closed contact QF2B of the QF2 changes from an open state to a closed state, the closing coil loop of the QF23 changes to a closed state, and the QF23 can be manually closed; the normally closed contact QF4B of the QF4 is connected in series in the closing coil loop of the QF34, and as the normally closed contact QF4B of the QF4 changes from an open state to a closed state, the closing coil loop of the QF34 changes to a closed state, and the QF34 can be manually closed. At this time, the QF12 communicates with the first bus bar M1 and the second bus bar 2, the QF23 communicates with the second bus bar M2 and the third bus bar M3, the QF34 communicates with the third bus bar M3 and the fourth bus bar M4, and the third transformer T3 simultaneously supplies power to the loads on the first bus bar M1, the second bus bar M2, the third bus bar M3 and the fourth bus bar M4.

Further, when the fourth transformer T4 meets the power supply condition again, the QF34 may be subjected to the opening operation, so that the QF4 meets the closing condition again. Specifically, as can be seen from fig. 7, the normally closed contact QF34B of the QF34 is connected in series to the closing coil circuit of the QF1, and as the QF34 is changed from the closing state to the opening state, the normally closed contact QF34B of the QF34 is changed from the opening state to the closing state, the closing coil circuit of the QF4 is changed to the closing state, and the QF4 can be manually closed.

When the first transformer T1 meets the power supply condition again, the QF12 can be subjected to the opening operation, so that the QF1 meets the closing condition again. Specifically, as can be seen from fig. 7, the normally closed contact QF12B of the QF12 is connected in series to the closing coil circuit of the QF1, and the QF1 can be manually closed as the QF12 is changed from the closed state to the open state, and the normally closed contact QF12B of the QF12 is changed from the open state to the closed state, and the closing coil circuit of the QF1 is changed to the closed state. On the basis, if the second transformer T2 meets the power supply condition again, the QF23 can be subjected to opening operation, so that the QF2 meets the closing condition again. Specifically, as can be seen from fig. 6, the normally closed contact QF23B of the QF23 is connected in series to the closing coil circuit of the QF2, and the QF2 can be manually closed as the QF23 is changed from the closed state to the open state, and the normally closed contact QF23B of the QF23 is changed from the open state to the closed state.

In the embodiment, the normal close contact QF12B of the QF12 is used for interlocking the QF1, the normal close contact QF12B of the QF12 and the normal close contact QF23B of the QF23 are used for interlocking the QF2, and the normal close contact QF34B of the QF34 is used for interlocking the QF4, so that the interlocking control in the switching process between the normal state and the state of the third transformer T3, wherein the first transformer T1, the second transformer T2 and the fourth transformer T4 are powered off, is realized.

Further, a seventh embodiment is proposed based on the first embodiment, referring to fig. 8, fig. 8 is a schematic diagram of a control circuit of a seventh embodiment of the four-wire three-bus electrical interlock system according to the present utility model.

As shown in fig. 8, in the present embodiment, a normally closed contact QF12B of QF12 is connected in series in the closing coil circuit of QF 1; after being connected in series with the normally closed contact QF23B of QF23, the normally closed contact QF12B of QF12 is connected in series in a closing coil loop of QF 2; after being connected in series with the normally closed contact QF23B of QF23 and the normally closed contact QF34B of QF34, the normally closed contact QF23B is connected in series in a closing coil loop of QF 3.

Specifically, when the low-voltage power distribution system is changed from the normal state to the state of ' the fourth transformer T4 supplying power ', the first transformer T1, the second transformer T2 and the third transformer T3 are powered off ', the QF4 keeps the on state unchanged, and the QF1, the QF2 and the QF3 are disconnected. After QF1, QF2 and QF3 are changed into the opening state, the corresponding normally-closed contacts are changed from the opening state to the closing state. As can be seen from fig. 8, the normally closed contact QF3B of QF3 is connected in series in the closing coil circuit of QF34, and QF34 can be manually closed as the normally closed contact QF3B of QF3 changes from the open state to the closed state, and the closing coil circuit of QF34 changes to the closed state; the normally closed contact QF2B of the QF2 is connected in series in the closing coil loop of the QF23, and as the normally closed contact QF2B of the QF2 changes from an open state to a closed state, the closing coil loop of the QF23 changes to a closed state, and the QF23 can be manually closed; the normally closed contact QF1B of the QF1 is connected in series in the closing coil loop of the QF12, and as the normally closed contact QF1B of the QF1 changes from an open state to a closed state, the closing coil loop of the QF12 changes to a closed state, and the QF12 can be manually closed. At this time, the QF12 communicates with the first bus bar M1 and the second bus bar 2, the QF23 communicates with the second bus bar M2 and the third bus bar M3, the QF34 communicates with the third bus bar M3 and the fourth bus bar M4, and the fourth transformer T4 simultaneously supplies power to the loads on the first bus bar M1, the second bus bar M2, the third bus bar M3, and the fourth bus bar M4.

Furthermore, when the first transformer T1 meets the power supply condition again, the QF12 can be subjected to the opening operation, so that the QF1 meets the closing condition again. Specifically, as can be seen from fig. 8, the normally closed contact QF12B of the QF12 is connected in series to the closing coil circuit of the QF1, and the QF1 can be manually closed as the QF12 is changed from the closed state to the open state, and the normally closed contact QF12B of the QF12 is changed from the open state to the closed state, and the closing coil circuit of the QF1 is changed to the closed state. On the basis, if the second transformer T2 meets the power supply condition again, the QF23 can be subjected to opening operation, so that the QF3 meets the closing condition again. Specifically, as can be seen from fig. 8, the normally closed contact QF23B of the QF23 is connected in series to the closing coil circuit of the QF2, and the QF2 can be manually closed as the QF23 is changed from the closed state to the open state, and the normally closed contact QF23B of the QF23 is changed from the open state to the closed state. On the basis, if the third transformer T3 meets the power supply condition again, the QF34 can be subjected to opening operation, so that the QF3 meets the closing condition again. Specifically, as can be seen from fig. 8, the normally closed contact QF34B of the QF34 is connected in series to the closing coil circuit of the QF3, and the QF3 can be manually closed as the QF34 is changed from the closed state to the open state, the normally closed contact QF34B of the QF34 is changed from the open state to the closed state, and the closing coil circuit of the QF3 is changed to the closed state.

In the embodiment, the normal close contact QF12B of the QF12 is used for interlocking the QF1, the series combination of the normal close contact QF12B of the QF12 and the normal close contact QF23B of the QF23 is used for interlocking the QF2, and the series combination of the normal close contact QF23B of the QF23 and the normal close contact QF34B of the QF34 is used for interlocking the QF3, so that the interlocking control in the switching process between the normal state and the state of the fourth transformer T4, wherein the first transformer T1, the second transformer T2 and the third transformer T3 are powered off, is realized.

Further, an eighth embodiment is proposed based on the first embodiment, referring to fig. 9, fig. 9 is a schematic diagram of a control circuit of the eighth embodiment of the four-wire three-bus electrical interlocking system according to the present utility model.

As shown in fig. 9, in the present embodiment, a normally closed contact QF12B of QF12 is connected in series in the closing coil circuit of QF 1; after being connected in series with the normally closed contact QF23B of QF23, the normally closed contact QF2B of QF2 is connected in series in a closing coil loop of QF 2; after being connected in series with the normally closed contact QF23B of QF23 and the normally closed contact QF34B of QF34, the normally closed contact QF23B is connected in series in a closing coil loop of QF 3; the normally closed contact QF34B of QF34 is connected in series in the closing coil circuit of QF 4.

It can be understood that the normally closed contacts of the respective bus-tie circuit breakers of different series combinations are connected in series in the switching coil loops of QF1, QF2, QF3 and QF4, so that the four-wire three-bus-tie electrical interlocking system in this embodiment can satisfy the power switching operation corresponding to all the above states, and the specific switching principle is similar to that of the above embodiments, and will not be repeated here.

Further, referring to fig. 10, fig. 10 is a diagram showing the positional relationship of the breaker switch according to the present embodiment. Specifically, if QF1, QF2, QF3, QF4 are closed and QF12, QF23, QF34 are opened, the first transformer T1, the second transformer T2, the third transformer T3, and the fourth transformer T4 are powered simultaneously, and the four-way incoming line is in a normal state.

If QF1, QF12, QF3 and QF34 are closed and QF2, QF23 and QF4 are opened, the first transformer T1 and the third transformer T3 are powered, and the second transformer T2 and the fourth transformer T4 are powered off; if QF12, QF2, QF34 and QF4 are closed and QF1, QF23 and QF3 are opened, the first transformer T1 and the third transformer T3 are powered off, and the second transformer T2 and the fourth transformer T4 are powered on.

If QF1, QF2, QF23 and QF34 are closed and QF12, QF3 and QF4 are opened, the first transformer T1 and the second transformer T2 are powered, and the third transformer T3 and the fourth transformer T4 are powered off; if QF12, QF23, QF3, QF4 are closed and QF1, QF2, QF34 are opened, the first transformer T1, the second transformer T2 are powered off, and the third transformer T3 and the fourth transformer T4 are powered on.

If QF1, QF12, QF23 and QF34 are closed and QF2, QF3 and QF4 are opened, the first transformer T1 is powered, and the second transformer T2, the third transformer T3 and the fourth transformer T4 are powered off; if QF12, QF2, QF23 and QF34 are closed and QF1, QF3 and QF4 are opened, the second transformer T2 is powered, and the first transformer T1, the third transformer T3 and the fourth transformer T4 are powered off; if QF12, QF23, QF3 and QF34 are closed and QF1, QF2 and QF4 are opened, the third transformer T3 is powered, and the first transformer T1, the second transformer T2 and the fourth transformer T4 are powered off; if QF12, QF23, QF34, QF4 are closed and QF1, QF2, QF3 are opened, the fourth transformer T4 supplies power, and the first transformer T1, the second transformer T2 and the third transformer T3 are powered off.

In the present embodiment, the normal close contact QF12B of the QF12 is used for interlocking the QF1, the series combination of the normal close contact QF2B of the QF2 and the normal close contact QF23B of the QF23 is used for interlocking the QF2, the series combination of the normal close contact QF23B of the QF23 and the normal close contact QF34B of the QF34 is used for interlocking the QF3, and the normal close contact QF34B of the QF34 is used for interlocking the QF4, so that the interlocking control of the low-voltage distribution system in the switching process between the normal state and all the states is realized.

The utility model also provides a low-voltage power distribution system which comprises the four-inlet three-bus-bar electric interlocking system. The detailed structure of the four-wire three-bus electrical interlocking system can refer to the above embodiment, and will not be described herein again; it can be understood that, because the four-wire three-bus electrical interlocking system is used in the low-voltage power distribution system of the present utility model, embodiments of the low-voltage power distribution system of the present utility model include all technical solutions of all embodiments of the four-wire three-bus electrical interlocking system, and the achieved technical effects are identical, and are not described herein again.

Further, the low voltage power distribution system further includes:

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather utilizing equivalent structural changes made in the present utility model description and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present utility model.

Claims

1. Four-wire three-bus-bar electrical interlocking system, characterized in that, four-wire three-bus-bar electrical interlocking system includes:

The first transformer, the second transformer, the third transformer and the fourth transformer are respectively connected with four paths of mains supply incoming lines in a one-to-one correspondence manner; the first bus bar, the second bus bar, the third bus bar and the fourth bus bar are respectively connected with a load;

The normally-closed contact of the second incoming circuit breaker and the normally-closed contact of the second bus-tie circuit breaker are connected in series to form a first series loop, and the first series loop is connected in parallel with the normally-closed contact of the first incoming circuit breaker and then is connected in series in a closing coil loop of the first bus-tie circuit breaker;

The normally closed contact of the second incoming circuit breaker and the normally closed contact of the first bus-tie circuit breaker are connected in series to form a second series circuit, the normally closed contact of the third incoming circuit breaker and the normally closed contact of the third bus-tie circuit breaker are connected in series to form a third series circuit, and the second series circuit and the third series circuit are connected in parallel and then connected in series in a closing coil circuit of the second bus-tie circuit breaker;

and the normally-closed contact of the third incoming circuit breaker and the normally-closed contact of the second bus-tie circuit breaker are connected in series to form a fourth series loop, and the fourth series loop is connected in parallel with the normally-closed contact of the fourth incoming circuit breaker and then is connected in series in the closing coil loop of the third bus-tie circuit breaker.

2. The four-wire three-bus electrical interlock system of claim 1 wherein the normally closed contacts of the second bus breaker are connected in series in the closing coil loop of the third wire breaker;

And the normally closed contact of the third bus-bar circuit breaker is connected in series in a closing coil loop of the fourth incoming line circuit breaker.

3. The four-wire three-bus electrical interlock system of claim 1 wherein the normally closed contacts of the second bus breaker are connected in series in the closing coil loop of the second wire breaker;

And the normally closed contact of the first bus-bar circuit breaker is connected in series in a closing coil loop of the first incoming line circuit breaker.

4. The four-wire three-bus-bar electrical interlocking system according to claim 1, wherein the normally-closed contact of the first bus-bar circuit breaker is connected in series with the normally-closed contact of the second bus-bar circuit breaker and then connected in series in a closing coil loop of the second wire-bar circuit breaker;

5. The four-wire three-bus electrical interlock system of claim 1 wherein the normally closed contact of the first bus breaker is connected in series in the closing coil loop of the first wire breaker;

6. The four-wire three-bus electrical interlock system of claim 1 wherein the normally closed contact of the first bus breaker is connected in series in the closing coil loop of the first wire breaker;

The normally-closed contact of the first bus-tie circuit breaker is connected in series with the normally-closed contact of the second bus-tie circuit breaker and then is connected in series in a closing coil loop of the second incoming line circuit breaker;

7. The four-wire three-bus electrical interlock system of claim 1 wherein the normally closed contact of the first bus breaker is connected in series in the closing coil loop of the first wire breaker;

And the normally-closed contact of the second bus-tie breaker is connected in series with the normally-closed contact of the third bus-tie breaker and then is connected in series in a closing coil loop of the third incoming line breaker.

8. The four-wire three-bus electrical interlock system of claim 1 wherein the normally closed contact of the first bus breaker is connected in series in the closing coil loop of the first wire breaker;

9. A low voltage power distribution system comprising the four-wire, three-bus electrical interlock system of any one of claims 1-8.

10. The low voltage power distribution system of claim 9, wherein the low voltage power distribution system further comprises:

The four-way mains supply inlet wire is respectively connected with the first transformer, the second transformer, the third transformer and the fourth transformer;