CN223462729U - Electric shock and short circuit prevention experimental power supply device - Google Patents
Electric shock and short circuit prevention experimental power supply deviceInfo
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- CN223462729U CN223462729U CN202422233530.2U CN202422233530U CN223462729U CN 223462729 U CN223462729 U CN 223462729U CN 202422233530 U CN202422233530 U CN 202422233530U CN 223462729 U CN223462729 U CN 223462729U
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Abstract
一种防触电防短路实验电源装置，属于实验电源技术领域，解决现有实验电源在上电测试时存在短路烧毁元器件及触电伤人的安全风险，以及缺少故障指示的问题；包括壳体、底座以及设置在底座上的空气开关、第一熔断器、第二熔断器、交流接触器、第一继电器、第二继电器、第三继电器、隔离变压器、电源灯、短路灯、运行灯、短路试验按钮、停止复位按钮、启动按钮；本实用新型设计的防短路放触电保护电路，采用隔离变压器配合接触器失压电路，有效的保护短路及防止触电风险；避免上电测试过程中存在安全风险及烧毁元器件的风险，既不会越级跳电也无需更换保险，节约了通电检测的时间，有效提高工作效率。
The utility model discloses an electric shock and short-circuit proof experimental power supply device, which belongs to the technical field of experimental power supplies and solves the problems of short-circuit burning of components and electric shock injuries during power-on testing in existing experimental power supplies, as well as the lack of fault indication. The utility model comprises a shell, a base, and an air switch, a first fuse, a second fuse, an AC contactor, a first relay, a second relay, a third relay, an isolation transformer, a power light, a short-circuit light, a running light, a short-circuit test button, a stop and reset button, and a start button. The short-circuit proof and electric shock protection circuit designed by the utility model adopts an isolation transformer in combination with a contactor pressure loss circuit to effectively protect against short circuits and prevent the risk of electric shock. The utility model avoids the safety risks and the risk of burning components during power-on testing, and neither tripping the power supply nor replacing the fuse is required, thereby saving time for power-on testing and effectively improving work efficiency.
Description
Technical Field
The utility model belongs to the technical field of experimental power supplies, and relates to an electric shock and short circuit prevention experimental power supply device.
Background
In the actual operation teaching and checking process of the electrical wiring board, when the wiring is finished and the power-on experiment is performed, a part of students may have the condition of short-circuiting the distribution board. When the common air switch and the common air switch are used for dealing with instantaneous huge short-circuit current, the sensitivity of circuit protection is poor, the possibility of off-level power jump exists, and short-circuit spark generated by power jump can burn components and even arc light to hurt people, so that safety accidents are caused. In addition, many primary electricians can forget to power off and directly operate because of the trouble after powering on, have the electric shock risk. Meanwhile, frequent replacement of insurance and re-power transmission also wastes time, affecting the working efficiency.
The prior electrician practical training disc test power supply facility adopts an air switch to match with a fused mass knife or a row of blades, pushes the knife upwards during test, pulls the knife open during power failure, and normally uses the fused mass in the knife for short-circuit protection during power protection, has simple structure and poor sensitivity, is difficult to realize comprehensive protection of power supply and people, has no indication after tripping, and cannot judge the cause of failure. Therefore, it is needed to provide an electric shock and short circuit preventing experimental power supply device for electrician wiring board practical teaching.
Disclosure of utility model
The technical scheme of the utility model is used for solving the problems of short circuit burning of components and parts, safety risk of electric shock injury and lack of fault indication existing in the power-on test of the existing experimental power supply.
The utility model solves the technical problems through the following technical scheme:
The electric shock and short circuit prevention experimental power supply device comprises a shell, a base, an air switch, a first fuse, a second fuse, an alternating current contactor, a first relay, a second relay, a third relay, an isolation transformer, a power lamp, a short circuit lamp, a running lamp, a short circuit test button, a stop reset button and a start button, wherein the air switch, the first fuse, the second fuse, the alternating current contactor, the first relay, the second relay, the third relay, the isolation transformer, the power lamp, the short circuit lamp, the running lamp, the short circuit test button, the stop reset button and the start button are arranged on the base;
The air switch, the first fuse, the power lamp and the second fuse are sequentially connected in series, the primary winding of the isolation transformer is connected with the power lamp in parallel, the reset input end of the stop reset button is connected with one end of a normally open contact of the first relay, the other end of the normally open contact of the first relay is connected to a connection common point of the first fuse and the power lamp, the reset output end of the stop reset button is connected with one end of a coil of the first relay, the other end of the coil of the first relay is connected to a connection common point of the second fuse and the power lamp, the normally open contact of the second relay is connected with the normally open contact of the first relay in parallel, the stop input end of the stop reset button is connected to a connection common point of the first fuse and the power lamp, the stop output end of the stop reset button is connected with one end of a coil of the third relay, and the other end of the coil of the third relay is connected to a connection common point of the second fuse and the power lamp;
The normally-closed contact of the third relay is connected with the coil of the alternating-current contactor in series and then connected with the running lamp in parallel, the running lamp is connected with the starting button in series and then connected with the secondary winding of the isolation transformer in parallel, the normally-open contact of the alternating-current contactor is connected with the coil of the second relay in series and then connected with the secondary winding of the isolation transformer in parallel, the normally-closed contact of the first relay, the normally-closed contact of the alternating-current contactor and the short-circuit lamp are connected in sequence and then connected with the secondary winding of the isolation transformer in parallel, and the secondary winding of the isolation transformer is connected with the short-circuit test button in parallel.
Further, the isolation transformer adopts an isolation control transformer from 220V to 220V, and the capacity is 100VA.
The alternating current contactor, the first relay, the second relay and the third relay are internally connected through the terminal blocks and used for finding faults.
Further, the air switch is connected with an external 220V input power supply through a wiring terminal, and a secondary winding of the isolation transformer is connected with an external load through the wiring terminal.
Further, the stop reset button is a compound button, the reset end is a normally closed button, and the stop end is a normally open button.
Further, an air circuit breaker is also included, the air circuit breaker being connected in parallel with the short circuit test button.
The utility model has the advantages that:
(1) The short-circuit-preventing electric shock protection circuit designed by the utility model adopts the isolation transformer to be matched with the contactor voltage-losing circuit, so that short circuit and electric shock risks are effectively protected, after the device is in short circuit, the power supply is automatically disconnected, the spark energy is extremely low, the situations that arc light hurts people and burns out equipment are avoided, the safety risks and the risks of burning out components are avoided in the power-on test process, the power-off is not required to be over-level, the safety is not required to be replaced, the power-on detection time is saved, and the working efficiency is effectively improved.
(2) Compared with the traditional experimental power supply equipment, the utility model is provided with the power supply indication, the operation indication and the short circuit fault indication, can display faults after short circuit tripping, can judge the cause of the faults, has the advantages of safety, high efficiency and good stability, is intuitive and clear, is convenient to use, is simple to operate, and has good application prospect and guiding significance.
Drawings
Fig. 1 is an external structural diagram of an electric shock and short circuit preventing experimental power supply device according to an embodiment of the present utility model;
FIG. 2 is an internal structure diagram of an electric shock and short circuit preventing experimental power supply device according to an embodiment of the utility model;
FIG. 3 is a schematic circuit diagram of an electric shock and short circuit preventing experimental power supply device according to an embodiment of the utility model;
11. The power supply device comprises a shell, 12, a base, 13, a terminal strip, 21, an air switch, 22, a first fuse, 23, a second fuse, 31, an alternating-current contactor coil, 32, an alternating-current contactor normally-open contact, 33, an alternating-current contactor normally-closed contact, 41, a first relay coil, 42, a first relay normally-open contact, 51, a second relay coil, 52, a second relay normally-open contact, 61, a third relay coil, 62, a third relay normally-closed contact, 71, a power lamp, 72, a short-circuit lamp, 73, an operating lamp, 81, a short-circuit test button, 82, a stop reset button, 83, a start button, 9 and an isolation transformer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. 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.
The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments:
example 1
1-3, Specifically, an electric shock and short circuit prevention experimental power supply device is disclosed, which comprises a shell 11, a base 12, an air switch 21, a first fuse 22, a second fuse 23, an alternating current contactor, a first relay, a second relay, a third relay, an isolation transformer 9, a power lamp 71, a short circuit lamp 72, an operation lamp 73, a short circuit test button 81, a stop reset button 82 and a start button 83, wherein the air switch 21, the first fuse 22, the second fuse 23, the alternating current contactor comprises an alternating current contactor coil 31, an alternating current contactor normally open contact 32 and an alternating current contactor normally open contact 33, the first relay comprises a first relay coil 41 and a first relay normally open contact 42, the second relay comprises a second relay coil 51 and a second relay normally open contact 52, and the third relay comprises a third relay coil 61 and a third relay normally open contact 62;
The air switch 21, the first fuse 22, the power lamp 71 and the second fuse 23 are sequentially connected in series, and the primary winding of the isolation transformer 9 is connected in parallel with the power lamp 71;
The reset input end of the stop reset button 82 is connected with one end of the first relay normally open contact 42, the other end of the first relay normally open contact 42 is connected to a connection common point of the first fuse 22 and the power lamp 71, the reset output end of the stop reset button 82 is connected with one end of the first relay coil 41, the other end of the coil of the first relay is connected to a connection common point of the second fuse 23 and the power lamp 71, the second relay normally open contact 52 is connected in parallel with the first relay normally open contact 42, the stop input end of the stop reset button 82 is connected to a connection common point of the first fuse 22 and the power lamp 71, the stop output end of the stop reset button 82 is connected to one end of the third relay coil 61, and the other end of the third relay coil 61 is connected to a connection common point of the second fuse 23 and the power lamp 71;
The third normally-closed relay contact 62 is connected in series with the coil 31 of the alternating-current contactor and then connected in parallel with the running lamp 73, the running lamp 73 is connected in series with the start button 83 and then connected in parallel with the secondary winding of the isolation transformer 9, the normally-open contact 32 of the alternating-current contactor is connected in series with the coil 51 of the second relay and then connected in parallel with the secondary winding of the isolation transformer 9, the normally-open contact 42 of the first relay, the normally-closed contact 33 of the alternating-current contactor and the short-circuit lamp 72 are sequentially connected and then connected in parallel with the secondary winding of the isolation transformer 9, and the secondary winding of the isolation transformer 9 is connected in parallel with the short-circuit test button 81.
Specifically, the 220V input power supply directly powers the device circuit through the air switch 21 for the load and the holding circuit of the ac contactor and relay. The air switch 21 is used for isolating 220V voltage to avoid electric shock, and meanwhile, the air switch 21 has good overload capacity to avoid override trip. The experimental power supply device provided by the utility model can select the configuration of components matched with the voltage of the experimental power supply device according to the requirement of an experimental site, such as alternating current 220V or alternating current 380V, and can select transformers with different capacities according to the requirement of the experimental site, for example, alternating current 220V and 100VA transformers.
The first and second fuses 22 and 23 are installed at a lower stage of the air switch 21 to protect an internal short-circuit fault of the device.
The isolation transformer 9 adopts an isolation control transformer with 220V to 220V, and the capacity is 100VA. The 220V to 220V transformer is called an isolation transformer 9, the number of turns of a primary winding and a secondary winding is the same and is 1:1, the input and output transformers of the isolation transformer 9 are the same according to the electromagnetic induction principle, but the isolation transformer 9 can be used for avoiding electric shock. Because the potential difference between the live wire of the alternating current and the ground is 220V, if the live wire is touched carelessly, electric shock is generated, because the input winding and the output winding of the isolation transformer 9 are completely insulated, the secondary of the isolation transformer 9 is not connected with the ground, and one wire is not in potential difference with the ground, and the electric shock can not be generated only by contacting one wire, so that the electric shock is safer. The primary and the secondary are completely disconnected, so that the anti-interference effect can be achieved.
The stop reset button 82 is a compound button, the reset end is a normally closed button, and the stop end is a normally open button.
The base 12 is a wooden insulating base 12 for fixing components on the base 12 and the outer casing 11.
The ac contactor is a 220V ac contactor, the power supply of the ac contactor coil 31 is from the isolation transformer 9, when the load (i.e. the secondary winding side) of the isolation transformer 9 is shorted, the voltage of the ac contactor coil 31 is reduced, the coil is automatically released, and the loop where the ac contactor coil 31 is located is disconnected.
Further, the intelligent electric power transformer further comprises a wiring terminal block 13, wherein the wiring terminal block 13 is arranged on the base 12, the alternating current contactor, the first relay, the second relay and the third relay are internally connected through the wiring terminal block 13 and used for finding faults, and all components on the base 12 adopt copper wires with the thickness of 1.5mm 2.
Further, the air switch 21 is connected to an external 220V input power source through a connection terminal, and the secondary winding of the isolation transformer 9 is connected to an external load through a connection terminal.
Further, as shown in fig. 3, the device further comprises an air circuit breaker which is connected in parallel with the short circuit test button 81, and in the embodiment, by arranging the air circuit breaker on the output side of the device, when the output current of the secondary winding of the isolation transformer 9 exceeds the rated value, the air switch is opened to protect downstream equipment and circuits from damage, and in addition, when the secondary side is short-circuited, the air circuit breaker can be utilized to timely open the circuit to prevent fire or other equipment damage caused by the short circuit.
Working principle:
The air switch 21QS1 is closed to transmit power, the power lamp 71 is turned on, the start button 83SB1 is pressed, the coil of the alternating current contactor KM1, the coil of the first relay KA1 and the coil of the second relay KA2 are powered on, the main loop of the coil of the alternating current contactor KM1 is connected by the output test (the secondary winding side) of the isolation transformer 9, the test voltage is normally output by 220V, the running lamp 73 is turned on, the test power supply output is normal, and the device provides power for the test load.
If the load is normal, the running lamp 73 is kept normally on, after the experiment is finished, the stop reset button 82 is pressed in time, the external test load and the external power supply are disconnected, and the electric shock risk is avoided in the disconnecting process. If the experimental power supply device is not used for a long time, the air switch 21 should be turned off, and the plug should be unplugged or the incoming power line should be removed.
If the test load is short-circuited, at the moment, the coil voltage of the alternating current contactor KM1 in a short-circuit relation is too low to ensure effective attraction, so that the output fault power supply is disconnected, and after the short-circuit power supply is disconnected, the voltage is quickly restored to a normal value, so that a short-circuit fault lamp is lightened, an operator is prompted that the load has a short-circuit condition, and the fault is checked. After the stop reset button 82 is pressed, the fault can be reset and the fault light extinguished.
To ensure reliable device circuit, during normal operation, short circuit test button 81 may be pressed to simulate a load short circuit condition and observe whether the fault light is on. If the fault light is not on, there may be a situation that the circuit of the device is damaged, the use process cannot protect the short circuit, the air switch 21 should be opened, and the device is stopped. After the short-circuit fault is reset or the device is stopped, the device can be started again by pressing the start button 83 again to supply power to the test load.
The device adopts an isolation transformer 9 with the capacity of 100VA, the primary side will generate small short-circuit current after the secondary side is short-circuited and has strong overload capacity, and meanwhile, the secondary side adopts short-circuit protection with the voltage of zero, when the short circuit happens, the contactor automatically loses power due to undervoltage, and is cut into a fault power supply, thereby achieving the protection purpose, and the fault lamp can be switched on to display the short circuit fault.
The foregoing embodiments are merely for illustrating the technical solution of the present utility model, but not for limiting the same, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments or equivalents may be substituted for parts of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solution of the embodiments of the present utility model in essence.
Claims (6)
1. The electric shock prevention and short circuit prevention experimental power supply device is characterized by comprising a shell (11), a base (12), an air switch (21), a first fuse (22), a second fuse (23), an alternating current contactor, a first relay, a second relay, a third relay, an isolation transformer (9), a power lamp (71), a short circuit lamp (72), an operation lamp (73), a short circuit test button (81), a stop reset button (82) and a start button (83), wherein the air switch (21) is arranged on the base (12), the alternating current contactor comprises an alternating current contactor coil (31), an alternating current contactor normally open contact (32) and an alternating current contactor normally closed contact (33), the first relay comprises a first relay coil (41) and a first relay normally open contact (42), the second relay comprises a second relay coil (51) and a second relay normally open contact (52), and the third relay comprises a third relay coil (61) and a third relay normally closed contact (62);
The air switch (21), the first fuse (22), the power lamp (71) and the second fuse (23) are sequentially connected in series, a primary winding of the isolation transformer (9) is connected with the power lamp (71) in parallel, a reset input end of the stop reset button (82) is connected with one end of the first relay normally open contact (42), the other end of the first relay normally open contact (42) is connected to a common connection point of the first fuse (22) and the power lamp (71), a reset output end of the stop reset button (82) is connected with one end of a first relay coil (41), the other end of the first relay coil is connected to a common connection point of the second fuse (23) and the power lamp (71), the second relay normally open contact (52) is connected with the first relay normally open contact (42) in parallel, and a stop input end of the stop reset button (82) is connected to a common connection point of the first fuse (22) and the power lamp (71), and a stop output end of the stop reset button (82) is connected to a third relay coil (61) at the other end of the third relay (71);
The third relay normally-closed contact (62) is connected in series with the alternating-current contactor coil (31) and then connected in parallel with the running lamp (73), the running lamp (73) is connected in series with the starting button (83) and then connected in parallel with the secondary winding of the isolation transformer (9), the alternating-current contactor normally-open contact (32) is connected in series with the second relay coil (51) and then connected in parallel with the secondary winding of the isolation transformer (9), and the first relay normally-open contact (42), the alternating-current contactor normally-closed contact (33) and the short-circuit lamp (72) are connected in sequence and then connected in parallel with the secondary winding of the isolation transformer (9), and the secondary winding of the isolation transformer (9) is connected in parallel with the short-circuit test button (81).
2. The electric shock and short circuit prevention experimental power supply device according to claim 1, wherein the isolation transformer (9) is an isolation control transformer with the capacity of 100VA and is 220V to 220V.
3. The electric shock and short circuit prevention experimental power supply device according to claim 1, further comprising a wiring terminal block (13), wherein the wiring terminal block (13) is arranged on the base (12), and the alternating current contactor, the first relay, the second relay and the third relay are internally wired through the wiring terminal block (13) and used for finding faults.
4. The electric shock and short circuit prevention experimental power supply device according to claim 1, wherein the air switch (21) is connected with an external 220V input power supply through a wiring terminal, and the secondary winding of the isolation transformer (9) is connected with an external load through the wiring terminal.
5. The electric shock and short circuit prevention experimental power supply device according to claim 1, wherein the stop reset button (82) is a compound button, the reset end is a normally closed button, and the stop end is a normally open button.
6. An electric shock and short circuit proof experimental power supply device according to claim 1, characterized in that it further comprises an air circuit breaker connected in parallel with the short circuit test button (81).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422233530.2U CN223462729U (en) | 2024-09-11 | 2024-09-11 | Electric shock and short circuit prevention experimental power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422233530.2U CN223462729U (en) | 2024-09-11 | 2024-09-11 | Electric shock and short circuit prevention experimental power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223462729U true CN223462729U (en) | 2025-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202422233530.2U Active CN223462729U (en) | 2024-09-11 | 2024-09-11 | Electric shock and short circuit prevention experimental power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223462729U (en) |
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- 2024-09-11 CN CN202422233530.2U patent/CN223462729U/en active Active
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