Economical and safe star-triangle switching device

Abstract

The utility model relates to the technical field of load devices, in particular to an economical and safe star-delta switching device, which comprises a first power line, a second power line, a third power line, a first switch part, a second switch part, a third switch part, a first load, a second load, a third load, a PLC (programmable logic controller), a first push switch and a second push switch. When star-shaped connection is carried out, the pressing rod of the first copper bar and the pressing rod of the second copper bar abut against the first pressing switch and the second pressing switch respectively, so that the first pressing switch and the second pressing switch generate signals to the PLC respectively, and the PLC knows that star-shaped connection is carried out at present; when triangular connection is carried out through the first copper bar, the second copper bar and the third copper bar, the first pressing switch and the second pressing switch are in an idle state, so that the first pressing switch and the second pressing switch cannot generate signals to the PLC, and the PLC can know that the current triangular connection exists.

Description

TECHNICAL FIELD

[0001] The utility model relates to load device technical field, concretely relates to an economic safety type star delta switching device. BACKGROUND

[0002] In power systems, the connection method of three-phase loads usually adopts two ways: delta connection (delta connection) and star connection (Y connection). These two connection methods are different in electrical characteristics, application occasions and circuit design. Correctly identifying the connection method of three-phase loads is crucial to ensure the stable operation of power systems and the normal work of load devices. However, most load devices on the market cannot accurately determine whether the current connection method is delta connection or star connection, and misjudgment may lead to failure of protection devices and increase the risk of equipment failure. SUMMARY

[0003] The utility model aims at the above -mentioned insufficient of prior art, provides an economic safety type star delta switching device.

[0004] The utility model discloses a kind of economic safety type star delta switching devices, including first power line, second power line, third power line, first switch part, second switch part, third switch part, first load, second load, third load, PLC controller, first press switch and second press switch;

[0005] The first power line is connected with the first load by the first switch part;The second power line is connected with the second load by the second switch part;The third power line is connected with the third load by the third switch part;The first press switch and second press switch are electrically connected with PLC controller respectively;

[0006] The economic safety type star delta switching device includes first copper bar, second copper bar and third copper bar;The first load, second load and third load are connected in star type by first copper bar and second copper bar;The first load, second load and third load are connected in delta type by first copper bar, second copper bar and third copper bar;

[0007] The first copper bar and second copper bar are provided with press bar for abutting with first press switch or second press switch.

[0008] The utility model further sets up, the economic safety type star delta switching device further includes voltage measuring instrument;The first power line, second power line and third power line are connected with the input end of voltage measuring instrument respectively;The output end of voltage measuring instrument is connected with PLC controller.

[0009] The present invention is further configured such that the economical and safe star-delta switching device also includes an on / off relay; the on / off relay is used to control the on / off of the first switching section, the second switching section and the third switching section; the on / off relay is connected to the PLC controller.

[0010] The present invention is further configured such that the economical and safe star-delta switching device includes an intermediate relay; the intermediate relay includes an intermediate switching part and an intermediate control part; the intermediate control part is connected to a PLC controller; and the intermediate switching part is connected to an on / off relay.

[0011] The present invention is further configured such that the economical and safe star-delta switching device includes a star indicator light and a delta indicator light; the star indicator light and the delta indicator light are respectively connected to the PLC controller.

[0012] The present invention is further configured such that the economical and safe star-delta switching device includes an overvoltage indicator light and a switching abnormality indicator light; the overvoltage indicator light and the switching abnormality indicator light are respectively connected to the PLC controller.

[0013] The present invention is further provided with insulating support frames at both ends of the first copper busbar, both ends of the second copper busbar, and both ends of the third copper busbar.

[0014] The present invention is further configured such that the first copper busbar, the second copper busbar and the third copper busbar are all provided with wiring terminals.

[0015] The present invention is further configured such that the first copper busbar, the second copper busbar and the third copper busbar are each provided with a plurality of mounting holes along the length direction; the wiring terminal is detachably connected to the mounting holes.

[0016] The beneficial effects of this utility model are as follows: When the first copper busbar and the second copper busbar are connected in a star configuration, the pressing rods of the first copper busbar and the second copper busbar respectively abut against the first pressing switch and the second pressing switch, thereby generating signals to the PLC controller, so that the PLC controller knows that it is currently in a star configuration; when the first copper busbar, the second copper busbar and the third copper busbar are connected in a delta configuration, the first pressing switch and the second pressing switch are in an idle state, so that the first pressing switch and the second pressing switch cannot generate signals to the PLC controller, so that the PLC controller knows that it is currently in a delta configuration. Attached Figure Description

[0017] The utility model will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present utility model. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0018] Fig. 1 is the electrical schematic diagram of the utility model;

[0019] Fig. 2 is the structural schematic diagram of the first copper bar of the utility model;

[0020] Wherein: 11, first power line;12, second power line;13, third power line;21, first switch part;22, second switch part;23, third switch part;24, on-off relay;31, first load;32, second load;33, third load;4, PLC controller;51, first press switch;52, second press switch;6, voltage measuring instrument;71, intermediate relay;72, intermediate control part;81, star indicator lamp;82, delta indicator lamp;83, overvoltage indicator lamp;84, switching abnormality indicator lamp;91, press rod;92, insulating support frame;93, wiring terminal;94, mounting hole. DETAILED DESCRIPTION

[0021] The utility model is further described in combination with the following examples.

[0022] By Figs. 1-2 It can be known that the economic and safe star-delta switching device provided by the embodiment comprises a first power line 11, a second power line 12, a third power line 13, a first switch part 21, a second switch part 22, a third switch part 23, a first load 31, a second load 32, a third load 33, a PLC controller 4, a first press switch 51, and a second press switch 52.

[0023] The first power line 11 is connected with the first load 31 through the first switch part 21;The second power line 12 is connected with the second load 32 through the second switch part 22;The third power line 13 is connected with the third load 33 through the third switch part 23;The first press switch 51 and the second press switch 52 are electrically connected with the PLC controller 4 respectively.

[0024] The economic and safe star-delta switching device comprises a first copper bar, a second copper bar, and a third copper bar;The first load 31, the second load 32, and the third load 33 are connected in star through the first copper bar and the second copper bar;The first load 31, the second load 32, and the third load 33 are connected in delta through the first copper bar, the second copper bar, and the third copper bar.

[0025] The first copper bar and the second copper bar are both provided with a press rod 91 for abutting against the first press switch 51 or the second press switch 52.

[0026] Specifically, the economic safety star-delta switching device described in the embodiment is used firstly to star-connect the first load 31, the second load 32 and the third load 33 through the first copper bar and the second copper bar, or to delta-connect the first load 31, the second load 32 and the third load 33 through the first copper bar, the second copper bar and the third copper bar; when star-connected through the first copper bar and the second copper bar, the pressing rod 91 of the first copper bar and the pressing rod 91 of the second copper bar abut against the first pressing switch 51 and the second pressing switch 52 respectively, so that the first pressing switch 51 and the second pressing switch 52 respectively generate signals to the PLC controller 4, and the PLC controller 4 knows that the current connection is star type; when delta-connected through the first copper bar, the second copper bar and the third copper bar, the first pressing switch 51 and the second pressing switch 52 are in an idle state, so that the first pressing switch 51 and the second pressing switch 52 cannot generate signals to the PLC controller 4, and the PLC controller 4 knows that the current connection is delta type; when only the first pressing switch 51 or the second pressing switch 52 generates a signal, the PLC controller 4 knows that the current connection has an error.

[0027] The economic safety star-delta switching device described in the embodiment further comprises a voltage measuring instrument 6; the first power line 11, the second power line 12 and the third power line 13 are connected with the input end of the voltage measuring instrument 6 respectively; and the output end of the voltage measuring instrument 6 is connected with the PLC controller 4. Specifically, the above setting can detect the measured voltage.

[0028] The economic safety star-delta switching device described in the embodiment further comprises an on-off relay 24; the on-off relay 24 is used to control the on-off of the first switch part 21, the second switch part 22 and the third switch part 23; and the on-off relay 24 is connected with the PLC controller 4. The above setting facilitates the control of the on-off of the first switch part 21, the second switch part 22 and the third switch part 23.

[0029] The economic safety star-delta switching device described in the embodiment further comprises an intermediate relay; the intermediate relay comprises an intermediate switch part 71 and an intermediate control part 72; the intermediate control part 72 is connected with the PLC controller 4; and the intermediate switch part 71 is connected with the on-off relay 24. The above setting can make the intermediate control part 72 lose voltage when a fault occurs, so that the first switch part 21, the second switch part 22 and the third switch part 23 are all disconnected, thereby protecting the device.

[0030] The economic safety star-delta switching device, the economic safety star-delta switching device further includes a star indicator lamp 81 and a delta indicator lamp 82; the star indicator lamp 81 and the delta indicator lamp 82 are connected with the PLC controller 4 respectively.

[0031] Specifically, when the voltage measuring instrument 6 detects that the voltage is less than 1.1 times of 400V, and the first press switch 51 and the second press switch 52 are not pressed, that is, the PLC controller 4 detects that X1 and X2 are both 0, the PLC controller 4 outputs the delta indicator lamp 82 to emit light, and other indicators are normal and do not act to allow loading;

[0032] When the detected voltage is less than 1.1 times of 690V, and the first press switch 51 and the second press switch 52 are pressed at the same time, that is, the PLC controller 4 detects that X1 and X2 are both 1, the PLC controller 4 outputs the star indicator lamp 81 to emit light, and other indicators are normal and do not act to allow loading;

[0033] When the PLC controller 4 detects that X1 and X2 are one 1 and one 0, the switching abnormality alarm is output, the switching abnormality indicator lamp 84 emits light, the equipment fails, the intermediate control part 72 is powered, and the load loop of the on-off relay 24 is cut off, so that the first switch part 21, the second switch part 22 and the third switch part 23 are all disconnected, and the device is protected.

[0034] The economic safety star-delta switching device, both ends of the first copper bar, both ends of the second copper bar and both ends of the third copper bar are provided with an insulating support frame 92. Through the above setting, the structure of the first copper bar, the second copper bar and the third copper bar is stable and reliable.

[0035] The economic safety star-delta switching device, the first copper bar, the second copper bar and the third copper bar are provided with a wiring terminal 93. Through the above setting, the first load 31, the second load 32 and the third load 33 are connected.

[0036] The economic safety star-delta switching device, the first copper bar, the second copper bar and the third copper bar are provided with a plurality of mounting holes 94 along the length direction; the wiring terminal 93 and the mounting hole 94 are detachably connected. Through the above setting, only two copper bars are needed when the star connection is used.

[0037] It should be explained finally that the above embodiment is only used to illustrate the technical scheme of the utility model, and is not the limit of the protection scope of the utility model, although the utility model is explained in detail with reference to the preferred embodiment, the ordinary skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently, and does not deviate from the essence and scope of the technical scheme of the utility model.

Claims

1. An economical and secure star-delta switching device, characterized by: The economic safety star-delta switching device comprises a first power line (11), a second power line (12), a third power line (13), a first switch part (21), a second switch part (22), a third switch part (23), a first load (31), a second load (32), a third load (33), a PLC controller (4), a first press switch (51), and a second press switch (52). The first power line (11) is connected with the first load (31) through the first switch part (21); the second power line (12) is connected with the second load (32) through the second switch part (22); the third power line (13) is connected with the third load (33) through the third switch part (23); the first press switch (51) and the second press switch (52) are respectively electrically connected with the PLC controller (4). The economic safety star-delta switching device comprises a first copper bar, a second copper bar, and a third copper bar; the first load (31), the second load (32), and the third load (33) are star-connected through the first copper bar and the second copper bar; the first load (31), the second load (32), and the third load (33) are delta-connected through the first copper bar, the second copper bar, and the third copper bar. The first copper bar and the second copper bar are both provided with a press rod (91) for abutting against the first press switch (51) or the second press switch (52).

2. An economical safety star-delta switching device according to claim 1, characterized in that: The economic safety star-delta switching device further comprises a voltage measuring instrument (6); the first power line (11), the second power line (12), and the third power line (13) are respectively connected with the input end of the voltage measuring instrument (6); the output end of the voltage measuring instrument (6) is connected with the PLC controller (4).

3. An economical safety star-delta switching device as claimed in claim 1, wherein: The economic safety star-delta switching device further comprises a on-off relay (24); the on-off relay (24) is used for controlling the on-off of the first switch part (21), the second switch part (22), and the third switch part (23); the on-off relay (24) is connected with the PLC controller (4).

4. An economical safety star-delta switching device as claimed in claim 3, wherein: The economic safety star-delta switching device further comprises an intermediate relay; the intermediate relay comprises an intermediate switch part (71) and an intermediate control part (72); the intermediate control part (72) is connected with the PLC controller (4); the intermediate switch part (71) is connected with the on-off relay (24).

5. An economical safety star-delta switching device as claimed in claim 1, wherein: The economic safety star-delta switching device further comprises a star-type indicator lamp (81) and a delta-type indicator lamp (82); the star-type indicator lamp (81) and the delta-type indicator lamp (82) are respectively connected with the PLC controller (4).

6. An economical safety star-delta switching device as claimed in claim 1, wherein: The economic safety star-delta switching device further comprises an overvoltage indicator lamp (83) and a switching abnormality indicator lamp (84); the overvoltage indicator lamp (83) and the switching abnormality indicator lamp (84) are respectively connected with the PLC controller (4).

7. An economical safety star-delta switching device as claimed in claim 1, wherein: Both ends of the first copper bar, both ends of the second copper bar, and both ends of the third copper bar are provided with an insulating support frame (92).

8. An economical safety star-delta switching device as claimed in claim 1, wherein: The first copper bar, the second copper bar, and the third copper bar are all provided with a terminal (93).

9. An economic safety star-delta switching device as claimed in claim 8, wherein: The first copper bar, the second copper bar and the third copper bar are provided with a plurality of mounting holes (94) along the length direction; the terminal (93) and the mounting hole (94) are detachably connected.

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