CN215681905U - Uninterrupted switching circuit of dual-power system and switch cabinet - Google Patents
Uninterrupted switching circuit of dual-power system and switch cabinet Download PDFInfo
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- CN215681905U CN215681905U CN202121256293.1U CN202121256293U CN215681905U CN 215681905 U CN215681905 U CN 215681905U CN 202121256293 U CN202121256293 U CN 202121256293U CN 215681905 U CN215681905 U CN 215681905U
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Abstract
The utility model provides a double power supply system uninterrupted switching circuit, which comprises two power supply loops, two side loop loops corresponding to the two power supply loops respectively, and two anti-false-closing loops corresponding to the two side loop loops respectively, wherein the power supply loops comprise a high-voltage input end, a transformer, a low-voltage side switch, a double power supply switcher, a first side switch and a low-voltage output end which are connected in sequence, the side loop comprises a second side switch connected in parallel between the output end of the transformer and the low-voltage output end, the anti-false-closing loop comprises a relay normally-open contact connected in series with the second side switch, a coil power supply, a normally-open auxiliary contact connected in series with the first input end of the double power supply switcher between the positive electrode and the negative electrode of the coil power supply, a normally-closed auxiliary contact connected with the second input end of the switcher, a relay coil and a normally-open auxiliary contact connected with the second side switch. The utility model also provides a switch cabinet. The utility model effectively solves the problem of power failure caused by the alternation of the double power supplies, and has low operation cost and obvious effect.
Description
Technical Field
The utility model relates to a double-power-supply-system uninterrupted switching circuit and a switch cabinet.
Background
With the development of the society, in an electric power distribution system, in order to avoid a power failure to cause operation stagnation, a standby power supply is often adopted, and a main power supply, the standby power supply and a switching circuit are all arranged in a switch cabinet. If in the transformer substation, two transformer stations are usually arranged in the switch cabinet, the two transformer stations are mutually standby, the high-voltage sides of the two transformer stations are respectively connected to different power supplies, when one transformer station loses power supply, the automatic power supply switching device can be immediately switched to the other transformer station to supply power, and the equipment in the transformer station cannot normally run due to power loss. At present, the 380V incoming line low-voltage power supply automatic switching function of the transformer substation is realized by three methods: the automatic switching device comprises a contact type (electromagnetic type) switching loop mode, a microcomputer type spare power automatic switching device mode and an automatic switching equipment (ATS) mode. However, in any switching mode, in a station power utilization alternation test, a phenomenon that low-load equipment in a station is temporarily powered off due to a variable power source for switching the station occurs, so that an office computer, an auxiliary control system and equipment, a direct-current charger alternating-current input, a high-voltage room and a relay room indoor air conditioner cannot normally run when the power is cut off, and after the alternation is finished, the high-voltage room and the relay room air conditioner (without power cut and restart) need to be restarted, and a running mode is reset. Similarly, the alternating of the dual power sources of the direct current charger can cause the problem that the direct current charger loses power for a short time.
SUMMERY OF THE UTILITY MODEL
The utility model provides a double-power-supply-system uninterrupted switching circuit and a switch cabinet, which realize uninterrupted alternation, effectively solve the problem of outage caused by alternation of double power supplies, and have low operation cost and obvious effect.
The utility model is realized by the following technical scheme:
a uninterrupted switching circuit of a dual power supply system comprises two power supply loops, two side loop loops corresponding to the two power supply loops respectively, and two anti-misclosing loops corresponding to the two side loop loops respectively, wherein the power supply loops comprise a high-voltage input end, a transformer, a low-voltage side switch, a dual power switch, a first side switch and a low-voltage output end which are connected in sequence, the dual power switch is provided with a first input end connected with the low-voltage side switch of the power supply loop and a second input end connected with the low-voltage side switch of the other power supply loop, the side loop comprises a second side switch connected in parallel between the output end of the transformer and the low-voltage output end, the anti-misclosing loop comprises a normally open contact of a relay, a coil power supply, a normally open auxiliary contact of the first input end of the dual power switch connected in series between the positive pole and the negative pole of the coil power supply, and a normally closed auxiliary contact of the second input end of the dual power switch, The relay coil and the second bypass switch normally open the auxiliary contact.
Further, the low-voltage side switch input end is connected with transformer output, the output is connected with the first input of dual power switch, dual power switch's output is connected with first bypass switch input, and first bypass switch output is connected with the low-voltage output, second bypass switch input is connected with transformer output, the output is connected with relay normally open contact input, and relay normally open contact output is connected with first bypass switch output.
Furthermore, the power supply loop further comprises a first change-over switch and a second change-over switch, wherein the input ends of the first change-over switch and the second change-over switch are both connected with the output end of the low-voltage side switch of the power supply loop, the output end of the first change-over switch is connected with the first input end of the double-power-supply switch of the power supply loop, and the output end of the second change-over switch is connected with the second input end of the double-power-supply switch of the other power supply loop.
The utility model is also realized by the following technical scheme:
a double power supply system uninterrupted switching circuit comprises two power supply loops, two side loop loops corresponding to the two power supply loops respectively, two anti-false switching loops corresponding to the two side loop loops respectively, a direct current bus and two direct current chargers, wherein the power supply loop comprises an alternating current input end, a power supply incoming line switch connected with the alternating current input end, a change-over switch connected with the output end of the power supply incoming line switch, and a first side switch connected with the output end of the change-over switch, the output end of the first side switch is connected with the direct current bus, the two direct current chargers are connected with the direct current bus respectively, the side loop comprises a second side switch connected between the alternating current input end and the direct current bus in parallel, the anti-false switching loop comprises a relay normally open contact connected with the second side switch in series, a coil power supply, a relay coil connected between the positive pole and the negative pole of the coil power supply in series, and a normally open auxiliary contact of the change-over switch of the power supply loop, The normally closed auxiliary contact of the change-over switch of the other power supply circuit and the normally open auxiliary contact of the first bypass switch of the power supply circuit.
Furthermore, the AC input end is a station transformer feeder screen.
The utility model is also realized by the following technical scheme:
a switch cabinet comprises a cabinet body, universal wheels arranged at the bottom of the cabinet body and a double-power-supply-system uninterrupted switching circuit arranged in the cabinet body.
The utility model has the following beneficial effects:
1. the uninterrupted switching circuit arranged in the switch cabinet can complete the alternation of the power supply loops under the condition that the low-voltage output ends are not powered off, and the universal wheels are arranged at the bottom of the switch cabinet, thereby being more convenient for the flexible use of the switch cabinet, when power supply switching is needed, the second bypass switch corresponding to the power supply loop is firstly closed, then the first bypass switch corresponding to the power supply loop is opened, at the moment, the two low-voltage output ends are powered by the bypass loop corresponding to the power supply loop, then the low-voltage side switch of the power supply loop is opened, the low-voltage side switch and the first bypass switch of the other power supply loop are closed, finally the second bypass switch of the power supply loop is opened, thus the alternation of the power supply loops can be completed, the power supply of the power supply loop is switched into the power supply of the other power supply loop, and when the power supply loop is powered on by mistake prevention, and a bypass corresponding to the other power supply loop can not be closed, so that the condition that the low-voltage side operates through a bypass loop is avoided.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram according to a first embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a second embodiment of the present invention.
Detailed Description
The first embodiment is as follows:
the switch cabinet comprises a cabinet body, universal wheels arranged at the bottom of the cabinet body and a double-power-supply-system uninterrupted switching circuit arranged in the cabinet body, wherein the double-power-supply-system uninterrupted switching circuit comprises a power supply loop 11, a power supply loop 12, a bypass loop 21 corresponding to the power supply loop 11, a bypass loop 22 corresponding to the power supply loop 12, an anti-misoperation loop 31 corresponding to the bypass loop 21 and an anti-misoperation loop 32 corresponding to the bypass loop 22, as shown in fig. 1.
The power supply loop 11 comprises a high-voltage input end (10kV I section), a transformer 13 connected with the high-voltage input end (10kV I section), a low-voltage side switch 401 with an input end connected with an output end of the transformer 13, a first change-over switch 411 and a second change-over switch 412 respectively connected with an output end of the low-voltage side switch 401, a dual-power-supply switcher ASC01 with a first input end (N end) connected with an output end of the first change-over switch 411, a first bypass switch PQK2 connected with an output end of the dual-power-supply switcher ASC01, and a low-voltage output end (380V I section) connected with an output end of the first bypass switch PQK2, wherein the second input end (R end) of the dual-power-supply switcher ASC01 is connected with the power supply loop 12, and an output end of the second change-over switch 412 is connected with the power supply loop 12.
The power supply loop 12 comprises a high-voltage input end (10kV II section), a transformer 13 connected with the high-voltage input end (10kV II section), a low-voltage side switch 402 with an input end connected with an output end of the transformer 13, a first change-over switch 422 and a second change-over switch 421 respectively connected with an output end of the low-voltage side switch 402, a dual-power-supply switcher ASC02 with a first input end (N end) connected with an output end of the first change-over switch 422, a first bypass switch PQK4 connected with an output end of the dual-power-supply switcher ASC02, and a low-voltage output end (380V II section) connected with an output end of the first bypass switch PQK4, wherein the second input end (R end) of the dual-power-supply switcher ASC02 is connected with the power supply loop 11, and the second change-over switch 421 is connected with the power supply loop 11.
The bypass circuit 21 corresponding to the power supply circuit 11 includes a second bypass switch PQK1 connected in parallel between the output of the transformer 13 and the low voltage output (section 380V I). The bypass circuit 22 corresponding to the power supply circuit 12 includes a second bypass switch PQK3 connected in parallel between the output of the transformer 13 and the low voltage output (380V II section).
The anti-false-closing circuit 31 respectively corresponding to the power supply circuit 11 and the bypass circuit 21 comprises a relay normally-open contact FW1-1 connected in series with a second bypass switch PQK1, a coil power supply for supplying power to the coil, a normally-open auxiliary contact ASC01_ N connected in series with a first input end of a dual-power-supply switch ASC01 between an anode and a cathode of the coil power supply, a normally-closed auxiliary contact ASC01_ R connected in series with a second input end of the dual-power-supply switch ASC01, a relay coil FW1 and a second bypass switch normally-open auxiliary contact PQK1_1, specifically, the input end of the second bypass switch PQK1 is connected with the output end of the transformer 13, the output end of the second bypass switch is connected with the input end of the relay normally-open contact FW1-1, and the output end of the relay normally-open contact FW1-1 is connected with the output end of the first bypass switch PQK 2.
The anti-false-closing circuit 32 respectively corresponding to the power supply circuit 12 and the bypass circuit 22 comprises a relay normally-open contact FW2-1 connected in series with a second bypass switch PQK3, a coil power supply for supplying power to the coil, a normally-open auxiliary contact ASC02_ N connected in series with a first input end of a dual-power-supply switch ASC02 between the positive and negative poles of the coil power supply, a normally-closed auxiliary contact ASC02_ R connected in series with a second input end of the dual-power-supply switch ASC02, a relay coil FW2, and a normally-open auxiliary contact PQK3_1 of the second bypass switch PQK3, specifically, an input end of the second bypass switch PQK3 is connected with an output end of the transformer 13, an output end of the second bypass switch is connected with an input end of the relay normally-open contact FW2-1, and an output end of the normally-open relay FW2-1 is connected with an output end of the first bypass switch PQK 4. Wherein, the coil power supply is the prior art.
When power supply switching is required (when the power supply circuit 11 is switched to the power supply circuit 12), the second bypass switch PQK1 corresponding to the power supply circuit 11 is closed, then the first bypass switch PQK2 corresponding to the power supply circuit 11 is opened, at this time, the two low-voltage output ends are supplied with power by the bypass circuit 21, then the low-voltage side switch 401 of the power supply circuit 11 is opened, the low-voltage side switch 402 and the first bypass switch PQK4 of the power supply circuit 12 are closed, and finally the second bypass switch PQK1 of the power supply circuit 11 is opened, so that the rotation of the power supply circuit can be completed, and the power supply of the power supply circuit 11 is switched to be supplied with power by the power supply circuit 12. The effect of preventing closing the return circuit by mistake lies in: when the power supply loop 12 supplies power, that is, the first input end of the dual power switch ASC01 is open, the second input end is closed, the normally open auxiliary contact ASC01_ N is open, and the normally closed auxiliary contact ASC01_ R is open, the relay coil FW _1 loses power, that is, in this case, the bypass loop 21 corresponding to the power supply loop 11 cannot be closed, so that the condition that the low-voltage side operates through a bypass loop is avoided.
Example two:
the switch cabinet comprises a cabinet body, universal wheels arranged at the bottom of the cabinet body and a double-power-supply-system uninterrupted switching circuit arranged in the cabinet body, wherein the double-power-supply-system uninterrupted switching circuit comprises a power supply loop 11, a power supply loop 12, a bypass loop 21 corresponding to the power supply loop 11, a bypass loop 22 corresponding to the power supply loop 12, an anti-false-closing loop 31 corresponding to the bypass loop 21, an anti-false-closing loop 32 corresponding to the bypass loop 22, a direct-current bus 4 and two direct-current chargers 5 as shown in fig. 1.
The power supply loop 11 comprises an alternating current input end (a transformer feeder screen for the station No. 1), a power supply incoming line switch Q1 connected with the alternating current input end, a change-over switch KM1 connected with the output end of a power supply incoming line switch Q1 and a first bypass switch PQK3 connected with the output end of the change-over switch KM1, the output end of the first bypass switch PQK3 is connected with the direct current bus 4, and the input ends of two direct current chargers 5 are respectively connected with the direct current bus 4.
The power supply loop 12 comprises an alternating current input end (a variable feeder screen for a station No. 2), a power supply incoming line switch Q2 connected with the alternating current input end, a change-over switch KM2 connected with the output end of a power supply incoming line switch Q2 and a first bypass switch PQK3 connected with the output end of the change-over switch KM2, the output end of the first bypass switch PQK3 is connected with the direct current bus 4, and the input ends of two direct current chargers 5 are respectively connected with the direct current bus 4.
The bypass circuit 21 associated with the power supply circuit 11 includes a second bypass switch PQK1 connected in parallel between the ac input terminal (station transformer feeder screen No. 1) and the dc bus 4. The bypass circuit 22 corresponding to the power supply circuit 12 includes a second bypass switch PQK2 connected in parallel between the ac input terminal (station transformer feeder screen No. 2) and the dc bus 4.
The anti-false-closing loop 31 corresponding to the power supply loop 11 and the bypass loop 12 respectively comprises a relay normally-open contact FW1_1 connected in series with the second bypass switch PQK1, a coil power supply, a relay coil FW1 connected in series between the positive and negative poles of the coil power supply, a normally-open auxiliary contact KM1_1 of a switch KM1 of the power supply loop 11, a normally-closed auxiliary contact KM2_1 of a switch KM2 of the power supply loop 12, and a normally-open auxiliary contact PQK1_1 of a first bypass switch PQK1 of the power supply loop 11.
The anti-false-closing circuit 32 corresponding to the power supply circuit 12 and the bypass circuit 22 respectively comprises a relay normally-open contact FW2_1 connected in series with the second bypass switch PQK2, a coil power supply, a relay coil FW2 connected in series between the positive and negative poles of the coil power supply, a normally-open auxiliary contact KM2_2 of a switch KM2 of the power supply circuit 12, a normally-closed auxiliary contact KM1_2 of a switch KM1 of the power supply circuit 11, and a normally-open auxiliary contact PQK2_1 of a first bypass switch PQK2 of the power supply circuit 12.
The principle of this embodiment is the same as that of the first embodiment, and is not described herein in detail, when the rotation is performed, the direct current charger 5 can be protected from impact, the service life of the direct current charger 5 is protected, and the phenomenon that the power of the whole direct current bus 4 in the rotation process is lost due to the open circuit inside the storage battery pack can be eliminated.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the utility model, which is defined by the appended claims and their equivalents and modifications within the scope of the description.
Claims (6)
1. The utility model provides a duplicate supply system switching circuit that does not have a power failure which characterized in that: comprises two power supply loops, two side loop loops respectively corresponding to the two power supply loops, and two anti-false-closing loops respectively corresponding to the two side loop loops, wherein the power supply loop comprises a high-voltage input end, a transformer, a low-voltage side switch, a double-power-supply switcher, a first side switch and a low-voltage output end which are sequentially connected, the double-power-supply switcher is provided with a first input end connected with the low-voltage side switch of the power supply loop and a second input end connected with the low-voltage side switch of the other power supply loop, the side loop comprises a second side switch connected in parallel between the output end of the transformer and the low-voltage output end, the anti-misclosing loop comprises a relay normally open contact, a coil power supply, a normally open auxiliary contact, a normally closed auxiliary contact, a relay coil and a second bypass switch normally open auxiliary contact, wherein the relay normally open contact is connected with the second bypass switch in series, the normally open auxiliary contact is connected with the first input end of the double power supply switch in series between the positive electrode and the negative electrode of the coil power supply, and the normally closed auxiliary contact is connected with the second input end of the double power supply switch in series.
2. The uninterrupted switching circuit of the dual power supply system according to claim 1, wherein: the low-voltage side switch input end is connected with the transformer output, the output end is connected with the first input end of a double-power-supply switcher, the output end of the double-power-supply switcher is connected with the first bypass switch input end, the first bypass switch output end is connected with the low-voltage output end, the second bypass switch input end is connected with the transformer output end, the output end is connected with the relay normally open contact input end, and the relay normally open contact output end is connected with the first bypass switch output end.
3. The uninterrupted switching circuit of the dual power supply system according to claim 1 or 2, wherein: the power supply loop further comprises a first change-over switch and a second change-over switch, wherein the input ends of the first change-over switch and the second change-over switch are connected with the output end of the low-voltage side switch of the power supply loop, the output end of the first change-over switch is connected with the first input end of the double-power-supply switcher of the power supply loop, and the output end of the second change-over switch is connected with the second input end of the double-power-supply switcher of the other power supply loop.
4. The utility model provides a duplicate supply system switching circuit that does not have a power failure which characterized in that: the power supply circuit comprises an alternating current input end, a power supply incoming switch connected with the alternating current input end, a change-over switch connected with the output end of the power supply incoming switch and a first bypass switch connected with the output end of the change-over switch, the output end of the first bypass switch is connected with the direct current bus, the two direct current chargers are respectively connected with the direct current bus, the bypass circuit comprises a second bypass switch connected between the alternating current input end and the direct current bus in parallel, the anti-misclosing loop comprises a relay normally open contact connected with the second bypass switch in series, a coil power supply, a relay coil connected between the positive electrode and the negative electrode of the coil power supply in series, a normally open auxiliary contact of a change-over switch of the power supply loop, a normally closed auxiliary contact of a change-over switch of the other power supply loop and a normally open auxiliary contact of the first bypass switch of the power supply loop.
5. The uninterrupted switching circuit of the dual power supply system according to claim 4, wherein: the transformer feeder screen comprises an alternating current input end which is a transformer feeder screen for a station.
6. A kind of switch cabinet, its characterized in that: the power-uninterrupted switching circuit comprises a cabinet body, universal wheels arranged at the bottom of the cabinet body and the power-uninterrupted switching circuit of the dual-power system as claimed in any one of claims 1-5 arranged in the cabinet body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121256293.1U CN215681905U (en) | 2021-06-04 | 2021-06-04 | Uninterrupted switching circuit of dual-power system and switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121256293.1U CN215681905U (en) | 2021-06-04 | 2021-06-04 | Uninterrupted switching circuit of dual-power system and switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215681905U true CN215681905U (en) | 2022-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121256293.1U Active CN215681905U (en) | 2021-06-04 | 2021-06-04 | Uninterrupted switching circuit of dual-power system and switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215681905U (en) |
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2021
- 2021-06-04 CN CN202121256293.1U patent/CN215681905U/en active Active
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