CN221080977U - Electrical control system based on dual power supply switching - Google Patents
Electrical control system based on dual power supply switching Download PDFInfo
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- CN221080977U CN221080977U CN202322526432.3U CN202322526432U CN221080977U CN 221080977 U CN221080977 U CN 221080977U CN 202322526432 U CN202322526432 U CN 202322526432U CN 221080977 U CN221080977 U CN 221080977U
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Abstract
The utility model relates to an electric control system based on dual power supply switching, which comprises a dual power supply switching device, a time delay relay, a contactor, a load switching control loop and a load; two ends of a coil of the delay relay are connected to the output end of the dual-power switching device; the coil of the delay relay is connected in series with the output end of the dual-power switching device; the contactor comprises a normally open contact and a three-phase main contact, the normally open contact of the contactor is connected in parallel with a delay disconnection movable contact of a delay relay, and a load is connected to the output end of the dual-power switching device through the three-phase main contact of the contactor. The utility model avoids the time from power failure to voltage recovery after the action of the dual-power switching device by utilizing the contact time delay return function of the time delay relay, thereby ensuring that the contactor in the loop can be self-maintained when the power failure is switched at the moment of failure and further ensuring the normal operation of equipment.
Description
Technical Field
The utility model relates to the field of electrical control, in particular to an electrical control system based on dual power supply switching.
Background
At present, many important devices realize a dual-power supply mode through a dual-power supply switching device, in practical application, a loop can normally operate when power supply switching is planned (namely live switching), but when power is lost at a fault moment (such as stealing and jumping of a main power supply switch) and voltage switching of the dual-power supply switching device is completed, a contactor in the loop often cannot be self-maintained due to voltage reduction to a return value, so that the device is stopped.
Disclosure of utility model
The utility model aims to solve the technical problem of providing an electric control system based on dual power supply switching, which can ensure that a contactor in a loop can be self-maintained when power is lost and switched at the moment of failure, thereby ensuring normal operation of equipment.
The technical scheme for solving the technical problems is as follows: an electric control system based on dual power supply switching comprises a dual power supply switching device, a delay relay, a contactor, a load switching control loop and a load;
Two ends of a coil of the delay relay are connected to the output end of the dual-power switching device;
The delay relay is connected with the delay switching-off movable contact, the load switching control loop and the coil of the contactor in series on the output end of the dual-power switching device;
The contactor comprises a normally open contact and a three-phase main contact, the normally open contact of the contactor is connected with a delay disconnection movable contact of the delay relay in parallel, and the load is connected to the output end of the dual-power switching device through the three-phase main contact of the contactor.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the remote switch-on control device also comprises a remote switch-on command switch, wherein the remote switch-on command switch is connected with the delay disconnection movable contact of the delay relay in parallel.
Further, the contactor also comprises a remote brake-separating instruction switch, wherein the remote brake-separating instruction switch is connected with the coil of the contactor in series.
Further, the contactor also comprises a three-phase automatic open or three-phase fuse which is connected in series between the three-phase main contact of the contactor and the output end of the dual-power switching device.
Further, the contactor further comprises a three-phase thermal relay, and the three-phase thermal relay is connected in series between the three-phase main contact of the contactor and the load.
Further, the delay time of the delay relay is 5S or 3S or 1S.
Further, the load switching control loop comprises a plurality of switching switches, and the switching switches are connected in series.
Further, the dual-power switching device is specifically a 220V alternating-current dual-power switching device, two paths of power input ends of the 220V alternating-current dual-power switching device are respectively connected with two paths of 220V three-phase power supplies, and an output end of the 220V alternating-current dual-power switching device comprises a three-phase output end and a zero line end; two ends of a coil of the delay relay are connected between any phase output end and a zero line end of the 220V alternating current dual-power switching device; the delay relay is connected with the switching contact point of the switching relay in series, the load switching control loop and the coil of the contactor are connected between any phase output end and zero line end of the 220V alternating current dual-power switching device; the load is connected to the three-phase output end of the 220V alternating current dual-power switching device through the three-phase main contact of the contactor.
Further, the dual-power switching device is specifically a 380V alternating-current dual-power switching device, two paths of power input ends of the 380V alternating-current dual-power switching device are respectively connected with two paths of 380V three-phase power supplies, and an output end of the 380V alternating-current dual-power switching device comprises a three-phase output end; two ends of a coil of the delay relay are connected between any two phase output ends of the 380V alternating current dual-power switching device; the delay relay is connected with the switching contact point of the delay relay, the load switching control loop and the coil of the contactor in series between any two phase output ends of the 380V alternating current dual-power supply switching device; the load is connected to the three-phase output end of the 380V alternating current dual-power switching device through the three-phase main contact of the contactor.
Further, the specific model of the 380V alternating-current dual-power supply switching device is ZR-ATS-AC-XX, and the delay relay is specifically a power-off delay relay with the model of ST3 PF.
The beneficial effects of the utility model are as follows: according to the electric control system based on the double-power switching, the contact time delay return function of the time delay relay is utilized to avoid the period from power failure to voltage recovery after the action of the double-power switching device, so that the contactor in a loop can be self-maintained when the power failure is switched at the moment of failure, and the normal operation of equipment is further ensured.
Drawings
Fig. 1 is an electrical schematic diagram of an electrical control system based on dual power switching according to the present utility model.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
As shown in fig. 1, an electrical control system based on dual power switching comprises a dual power switching device 1, a time delay relay ST, a contactor KM, a load switching control loop 2 and a load 3;
Two ends of a coil of the delay relay ST are connected to the output end of the dual-power switching device 1;
The delay of the delay relay ST is used for disconnecting a movable contact, the load switching control loop 2 and the coil of the contactor KM are connected in series on the output end of the dual-power switching device 1;
The contactor KM comprises a normally open contact and a three-phase main contact, the normally open contact of the contactor KM is connected with a delay disconnection moving contact of the delay relay ST in parallel, and the load 3 is connected to the output end of the dual power supply switching device 1 through the three-phase main contact of the contactor KM.
In this particular embodiment: the electric control system based on dual power supply switching further comprises a remote closing instruction switch HZJ, wherein the remote closing instruction switch HZJ is connected with a delay disconnection moving contact of the delay relay ST in parallel.
The remote closing instruction switch HZJ is an instantaneous switch which can receive a remote closing instruction to be closed, so that a loop is closed, and remote control is facilitated.
In this particular embodiment: the dual power switching-based electrical control system further comprises a remote opening command switch TZJ, wherein the remote opening command switch TZJ is connected in series with the coil of the contactor KM.
The remote opening command switch TZJ is an instantaneous switch, which can receive a remote opening command to open, thereby opening a loop and facilitating remote control.
In this particular embodiment: the electrical control system based on dual power switching further comprises a three-phase automatic air-break S or a three-phase fuse S, wherein the three-phase automatic air-break S or the three-phase fuse S is connected in series between a three-phase main contact of the contactor KM and an output end of the dual power switching device 1.
The three-phase automatic open S or the three-phase fuse S has an overcurrent protection function and protects the main loop.
In this particular embodiment: the electrical control system based on dual power switching further comprises a three-phase thermal relay EHP connected in series between the three-phase main contact of the contactor KM and the load 3.
The three-phase thermal relay EHP can overload protect the load, thereby protecting the load safety.
In this particular embodiment: the delay time of the delay relay ST is 5S or 3S or 1S.
In this particular embodiment: the load switching control loop 2 comprises a plurality of switching switches, and the switching switches are connected in series.
Specifically, the electric control system based on dual power supply switching can be applied to air cooling control of a transformer in a power plant; the load device comprises an oil pump and three fans, and four corresponding on-off switches are arranged to respectively control the oil pump and the three fans.
In other embodiments: the dual-power switching device 1 is specifically a 220V alternating-current dual-power switching device, two paths of power input ends of the 220V alternating-current dual-power switching device are respectively connected with two paths of 220V three-phase power supplies, and an output end of the 220V alternating-current dual-power switching device comprises a three-phase output end and a zero line end; two ends of a coil of the delay relay ST are connected between any phase output end and a zero line end of the 220V alternating current dual-power switching device; the delay breaking movable contact of the delay relay ST, the load switching control loop 2 and the coil of the contactor KM are connected in series between any phase output end and zero line end of the 220V alternating current dual-power switching device; the load 3 is connected to the three-phase output end of the 220V alternating current dual power supply switching device through the three-phase main contact of the contactor KM.
In this particular embodiment: the dual-power switching device 1 is specifically a 380V alternating-current dual-power switching device, two paths of power input ends of the 380V alternating-current dual-power switching device are respectively connected with two paths of 380V three-phase power supplies, and an output end of the 380V alternating-current dual-power switching device comprises a three-phase output end; two ends of a coil of the delay relay ST are connected between any two phase output ends of the 380V alternating current dual-power switching device; the delay of the delay relay ST opens a movable contact, the load switching control loop 2 and the coil of the contactor KM are connected in series between any two phase output ends of the 380V alternating current dual-power switching device; the load 3 is connected to the three-phase output end of the 380V alternating current dual-power supply switching device through the three-phase main contact of the contactor KM.
In this particular embodiment: the specific model of the 380V alternating-current dual-power supply switching device is ZR-ATS-AC-XX, and the delay relay ST is specifically a power-off delay relay with the model of ST3 PF.
When the relay ST without delay and the return contact with delay are not provided, the I-path power switch is simulated to steal, the dual-power switching device rapidly moves to switch to I I-path power, but the contactor KM in the main control loop is in demagnetizing, the normally open contact of the contactor KM is disconnected, and the remote closing instruction switch HZJ is an instantaneous contact, so that the three-phase main contact (large-capacity normally open contact) of the contactor KM in the 380V power loop is disconnected, and the 380V main loop of the load (motor) is in power failure and shutdown.
When the delay relay ST and the delay return contact thereof are added, the I-path power switch is simulated to steal, the switching device rapidly moves to switch to I I-path power, the delay of the delay relay ST is used for disconnecting the movable contact, the main control loop is not disconnected, and the voltage can be excited again and self-maintained when the voltage is restored to the action of the contactor KM after switching, so that the 380V power loop of the load (motor) is ensured to stably operate all the time in the power-off switching.
The practical application proves that the problem that the device is stopped due to short-time low-voltage loss of magnetic flux of the contactor in the control loop during the loss of power switching can be effectively prevented by adding the function of delaying and breaking the contacts of the power-off delay relay aiming at the ZR-ATS-AC-XX type dual-power switching device.
Time setting problem of a time delay relay: the power-off delay relay delay time is set to be 5S, 3S and 1S respectively, the switching device rapidly acts to switch to the running condition of the motor when I I paths of power are supplied when the I path power supply switch is in stealing, the test results can ensure that the contactor KM does not lose the magnetic motor to normally run in the power-off switching, and finally the power-off delay relay delay time is set to be 1S through professional discussion.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. An electric control system based on dual power supply switching is characterized in that: the device comprises a dual power supply switching device, a time delay relay, a contactor, a load switching control loop and a load;
Two ends of a coil of the delay relay are connected to the output end of the dual-power switching device;
The delay relay is connected with the delay switching-off movable contact, the load switching control loop and the coil of the contactor in series on the output end of the dual-power switching device;
The contactor comprises a normally open contact and a three-phase main contact, the normally open contact of the contactor is connected with a delay disconnection movable contact of the delay relay in parallel, and the load is connected to the output end of the dual-power switching device through the three-phase main contact of the contactor.
2. The dual power switching-based electrical control system of claim 1, wherein: the remote switch-on control device is characterized by further comprising a remote switch-on instruction switch, wherein the remote switch-on instruction switch is connected with the delay disconnection movable contact of the delay relay in parallel.
3. The dual power switching-based electrical control system of claim 1, wherein: the remote brake-separating command switch is connected with the coil of the contactor in series.
4. The dual power switching-based electrical control system of claim 1, wherein: the automatic three-phase switch also comprises a three-phase automatic open or three-phase fuse, wherein the three-phase automatic open or three-phase fuse is connected in series between the three-phase main contact of the contactor and the output end of the dual-power switching device.
5. The dual power switching-based electrical control system of claim 1, wherein: the three-phase thermal relay is connected in series between the three-phase main contact of the contactor and the load.
6. The dual power switching-based electrical control system of claim 1, wherein: the delay time of the delay relay is 5S or 3S or 1S.
7. The dual power switching-based electrical control system of claim 1, wherein: the load switching control loop comprises a plurality of switching switches, and the switching switches are connected in series.
8. The dual power switching based electrical control system of any of claims 1 to 7, wherein: the dual-power switching device is specifically a 220V alternating-current dual-power switching device, two paths of power input ends of the 220V alternating-current dual-power switching device are respectively connected with two paths of 220V three-phase power supplies, and an output end of the 220V alternating-current dual-power switching device comprises a three-phase output end and a zero line end; two ends of a coil of the delay relay are connected between any phase output end and a zero line end of the 220V alternating current dual-power switching device; the delay relay is connected with the switching contact point of the switching relay in series, the load switching control loop and the coil of the contactor are connected between any phase output end and zero line end of the 220V alternating current dual-power switching device; the load is connected to the three-phase output end of the 220V alternating current dual-power switching device through the three-phase main contact of the contactor.
9. The dual power switching based electrical control system of any of claims 1 to 7, wherein: the dual-power switching device is specifically a 380V alternating-current dual-power switching device, two paths of power input ends of the 380V alternating-current dual-power switching device are respectively connected with two paths of 380V three-phase power supplies, and an output end of the 380V alternating-current dual-power switching device comprises a three-phase output end; two ends of a coil of the delay relay are connected between any two phase output ends of the 380V alternating current dual-power switching device; the delay relay is connected with the switching contact point of the delay relay, the load switching control loop and the coil of the contactor in series between any two phase output ends of the 380V alternating current dual-power supply switching device; the load is connected to the three-phase output end of the 380V alternating current dual-power switching device through the three-phase main contact of the contactor.
10. The dual power switching-based electrical control system of claim 9, wherein: the specific model of the 380V alternating-current dual-power supply switching device is ZR-ATS-AC-XX, and the delay relay is specifically a power-off delay relay with the model of ST3 PF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322526432.3U CN221080977U (en) | 2023-09-18 | 2023-09-18 | Electrical control system based on dual power supply switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322526432.3U CN221080977U (en) | 2023-09-18 | 2023-09-18 | Electrical control system based on dual power supply switching |
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| Publication Number | Publication Date |
|---|---|
| CN221080977U true CN221080977U (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322526432.3U Active CN221080977U (en) | 2023-09-18 | 2023-09-18 | Electrical control system based on dual power supply switching |
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| CN (1) | CN221080977U (en) |
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- 2023-09-18 CN CN202322526432.3U patent/CN221080977U/en active Active
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