Electric shock and short circuit prevention experiment power supply device
By using an anti-electric shock and anti-short-circuit experimental power supply device and an isolation transformer and contactor voltage loss circuit, the risks of short circuit and electric shock during power-on testing of the experimental power supply device are solved, and safe automatic power-off and fault indication are achieved, thereby improving safety and work efficiency.
Patent Information
- Application Number
- CN202422233530.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-09-11
AI Technical Summary
Existing experimental power supply devices have safety risks such as short circuit, burning components and electric shock during power-on testing, and lack fault indication, which affects work efficiency.
An anti-electric shock and anti-short circuit experimental power supply device is used, which includes an air switch, a first fuse, a second fuse, an AC contactor, a relay, an isolation transformer, a power light, a short-circuit light and other components. The isolation transformer cooperates with the contactor pressure loss circuit to automatically disconnect the power supply and display the fault, avoiding the risk of electric shock and short circuit.
It effectively protects against short circuits and electric shocks, automatically disconnects the power supply to avoid arc injuries and equipment damage, and has a fault indication function, which improves safety and work efficiency.
Smart Images
Figure CN223462729U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to experimental power supply technical field relates to a kind of anti-electric shock short-circuit experimental power supply device. BACKGROUND
[0002] In the process of electrical wiring board practical teaching and examination, when the wiring is completed and the power is on, some students may short-circuit the distribution board. The ordinary air switch and fuse have poor sensitivity in circuit protection when dealing with instantaneous large short-circuit current, and there is a possibility of grade skipping. The short-circuit spark generated by tripping may burn components and even cause arc light injury, leading to safety accidents. In addition, many junior electricians may directly operate after power-on due to fault and forget to stop power, which poses a risk of electric shock. At the same time, frequent replacement of fuses and re-powering will waste time and affect work efficiency.
[0003] The existing electrical training board test power supply facility adopts an air switch front stage with a fuse blade or a power strip. During testing, the blade is pushed up; when power is off, the blade is pulled open. The power supply protection relies on the fuse inside the blade for short-circuit protection. The structure is simple, the sensitivity is poor, and it is difficult to achieve comprehensive protection of the power supply and the person. After tripping, there is no indication to determine the cause of the fault. Therefore, it is urgent to provide an anti-electric shock and short-circuit experimental power supply device for electrical wiring board practical teaching. UTILITY MODEL CONTENTS
[0004] The technical solution of the utility model solves the problems of short-circuit burning of components and electric shock injury during power-on testing of existing experimental power supply, and lack of fault indication.
[0005] The utility model solves the above technical problems through the following technical solutions:
[0006] An anti-electric shock and short-circuit experimental power supply device includes a housing, a base, 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 lamp, a short-circuit lamp, a running lamp, a short-circuit test button, a stop reset button, and a start button arranged on the base. The AC contactor includes an AC contactor coil, an AC contactor normally open contact, and an AC contactor normally closed contact. The first relay includes a first relay coil and a first relay normally open contact. The second relay includes a second relay coil and a second relay normally open contact. The third relay includes a third relay coil and a third relay normally closed contact.
[0007] The air switch, the first fuse, the power lamp and the second fuse are connected in series, and the primary winding of the isolation transformer is connected in parallel with the power lamp; one end of the normally open contact of the first relay is connected to the reset input end of the stop reset button, the other end of the normally open contact of the first relay is connected to the connecting common point of the first fuse and the power lamp, one end of the coil of the first relay is connected to the reset output end of the stop reset button, and the other end of the coil of the first relay is connected to the connecting common point of the second fuse and the power lamp, and the normally open contact of the second relay is connected in parallel with the normally open contact of the first relay; the stop input end of the stop reset button is connected to the connecting common point of the first fuse and the power lamp, one end of the coil of the third relay is connected to the stop output end of the stop reset button, and the other end of the coil of the third relay is connected to the connecting common point of the second fuse and the power lamp.
[0008] The normally closed contact of the third relay is connected in series with the coil of the alternating current contactor, and then connected in parallel with the running lamp, and the running lamp is connected in series with the start button, and then connected in parallel with the secondary winding of the isolation transformer; the normally open contact of the alternating current contactor is connected in series with the coil of the second relay, and then connected in parallel with the secondary winding of the isolation transformer; the normally open contact of the first relay, the normally closed contact of the alternating current contactor and the short circuit lamp are connected in series, and then connected in parallel with the secondary winding of the isolation transformer, and the secondary winding of the isolation transformer is connected in parallel with the short circuit test button.
[0009] Further, the isolation transformer is a 220V-to-220V isolation control transformer with a capacity of 100VA.
[0010] Further, the utility model further includes a terminal block, the terminal block is arranged on the base, and the alternating current contactor, the first relay, the second relay and the third relay are internally connected through the terminal block, so that the fault can be found.
[0011] Further, the air switch is connected with an external 220V input power supply through a terminal, and the secondary winding of the isolation transformer is connected with an external load through a terminal.
[0012] Further, the stop reset button is a composite button, the reset end is a normally closed button, and the stop end is a normally open button.
[0013] Further, the utility model further includes an air circuit breaker, and the air circuit breaker is connected in parallel with the short circuit test button.
[0014] The utility model has the advantages that:
[0015] (1) The utility model discloses a prevent short circuit and put electric shock protection circuit, adopt the isolating transformer cooperation contactor loss of voltage circuit, effectively protect short circuit and prevent electric shock risk, after the short circuit of device, automatic power off, spark energy is minimum, avoid the arc light hurt people and burn the equipment condition, avoid the security risk and burn component device's risk in the process of power -on test, neither will grade -jump electricity also need not replace the insurance, saved the time of power -on detection, effectively improved work efficiency.
[0016] (2) Compared with traditional experimental power supply equipment, the utility model discloses power supply indication, operation indication, short circuit fault indication, can have fault display after short circuit tripping, can judge the fault reason, has the advantages of safety, high efficiency, stability, and intuitive, convenient to use, simple operation, has good application prospect and guiding significance. BRIEF DESCRIPTION OF DRAWINGS
[0017] Fig. 1 It is the external structure diagram of the anti-electric shock and short circuit experimental power supply device of the utility model embodiment;
[0018] Fig. 2 It is the internal structure diagram of the anti-electric shock and short circuit experimental power supply device of the utility model embodiment;
[0019] Fig. 3 It is the circuit principle diagram of the anti-electric shock and short circuit experimental power supply device of the utility model embodiment;
[0020] 11, shell;12, base;13, terminal row;21, air switch;22, first fuse;23, second fuse;31, AC contactor coil;32, AC contactor normally open contact;33, AC contactor normally closed contact;41, first relay coil;42, first relay normally open contact;51, second relay coil;52, second relay normally open contact;61, third relay coil;62, third relay normally closed contact;71, power lamp;72, short circuit lamp;73, running lamp;81, short circuit test button;82, stop reset button;83, start button;9, isolating transformer. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be described clearly and completely below, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the scope of the utility model protection.
[0022] The technical scheme of the utility model will be further described below in combination with the drawings of the specification and specific embodiments.
[0023] Embodiment one
[0024] As Figs. 1-3 shown, specifically discloses a kind of anti-electric shock anti-short circuit experimental power supply device, including shell 11, base 12 and the air switch 21 of setting on base 12, first fuse 22, second fuse 23, AC contactor, first relay, second relay, third relay, isolation transformer 9, power lamp 71, short-circuit lamp 72, running lamp 73, short-circuit test button 81, stop reset button 82, start button 83;The AC contactor includes AC contactor coil 31, AC contactor normally open contact 32, AC contactor normally closed contact 33;The first relay includes first relay coil 41, first relay normally open contact 42;The second relay includes second relay coil 51, second relay normally open contact 52;The third relay includes third relay coil 61, third relay normally closed contact 62;
[0025] The air switch 21, first fuse 22, power lamp 71, second fuse 23 are connected in series in turn, and the primary winding of the isolation transformer 9 is connected in parallel with the power lamp 71.
[0026] One end of the first relay normally open contact 42 is connected to the reset input end of the stop reset button 82, and the other end of the first relay normally open contact 42 is connected to the common connection point of the first fuse 22 and the power lamp 71, and one end of the first relay coil 41 is connected to the reset output end of the stop reset button 82, and the other end of the coil of the first relay is connected to the common connection point of the second fuse 23 and the power lamp 71, and 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 the common connection point of the first fuse 22 and the power lamp 71, one end of the third relay coil 61 is connected to the stop output end of the stop reset button 82, and the other end of the third relay coil 61 is connected to the common connection point of the second fuse 23 and the power lamp 71.
[0027] The third relay normally closed contact 62 is connected in series with the AC contactor coil 31, and then connected in parallel with the running lamp 73, and 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 AC 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;The first relay normally open contact 42, the AC contactor normally closed contact 33 and the short-circuit lamp 72 are connected in turn, 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.
[0028] Specifically, the 220V input power supply directly supplies power to the device circuit through the air switch 21, which is used for the load and the holding circuit of the AC contactor and the relay. The air switch 21 is used to isolate the 220V voltage to avoid electric shock, and the air switch 21 has good overload capacity to avoid overstep tripping. The experimental power supply device provided by the utility model can select the components matched with the voltage according to the needs of the test site, such as AC 220V or AC 380V, and can also select different capacity transformers, for example, AC 220V and 100VA transformer.
[0029] The first fuse 22 and the second fuse 23 are installed at the lower level of the air switch 21 and are used to protect the internal short circuit fault of the device.
[0030] The isolation transformer 9 adopts an isolation type control transformer with 220V to 220V, and the capacity is 100VA. The transformer with 220V to 220V is called an isolation transformer 9, the primary winding and the secondary winding have the same number of turns, which is 1:1. According to the principle of electromagnetic induction, the input and output of the isolation transformer 9 are the same in voltage, but the isolation transformer 9 can be used to avoid electric shock. Because the potential difference between the live wire of the AC and the ground is 220 volts, if not careful, it will be electric shock. Because the input winding and the output winding of the isolation transformer 9 are completely insulated, the secondary winding of the isolation transformer 9 is not connected to the ground, and there is no potential difference between the line and the ground, so touching only one line will not cause electric shock, which is safer. Because the primary and the secondary are completely disconnected, it can also play a role in anti-interference.
[0031] The stop reset button 82 is a composite button, the reset end is a normally closed button, and the stop end is a normally open button.
[0032] The base 12 adopts a wooden insulating base 12, which is used to fix the components on the base 12 and the external shell 11.
[0033] The AC contactor is a 220V AC contactor, and the power supply of the AC contactor coil 31 comes from the isolation transformer 9. When the isolation transformer 9 load (i.e. the secondary winding side) is short-circuited, the voltage of the AC contactor coil 31 is reduced, and the coil is automatically released, disconnecting the loop where the AC contactor coil 31 is located.
[0034] Further, it further includes a terminal block 13, the terminal block 13 is arranged on the base 12, the AC contactor, the first relay, the second relay and the third relay are internally wired through the terminal block 13, which is used for fault finding, and the components on the base 12 all adopt 1.5mm 2 copper wire.
[0035] Further, the air switch 21 is connected to the external 220V input power supply through the terminal, and the secondary winding of the isolation transformer 9 is connected to the external load through the terminal.
[0036] Further, as shown in Fig. 3 the air circuit breaker is also connected in parallel with the short circuit test button 81; in this embodiment, an air circuit breaker is also arranged on the output side of the device, which can be disconnected when the output current of the secondary winding of the isolation transformer 9 exceeds the rated value, thereby protecting the downstream equipment and lines from damage; in addition, when a short circuit occurs on the secondary side, the air circuit breaker can be used to disconnect the circuit in time to prevent fire or damage to other equipment caused by the short circuit.
[0037] Working principle:
[0038] Turn on the air switch 21 QS1 to supply power, and the power supply lamp 71 is on; press the start button 83 SB1, and the AC contactor KM1 coil, the first relay KA1 coil, and the second relay KA2 coil are powered on. The AC contactor KM1 coil main circuit is connected to the output measurement (secondary winding side) of the isolation transformer 9, and the normal output test voltage is 220V. The running lamp 73 is on, indicating that the test power output is normal, and the device has provided power for the test load.
[0039] If the load is normal, the running lamp 73 will remain on. After the experiment is completed, the stop reset button 82 should be pressed in time to disconnect the external test load and external power supply, avoiding the risk of electric shock during the disconnection process. If the test power device is not used for a long time, the air switch 21 should also be disconnected, and the plug should be removed or the incoming power line should be removed.
[0040] If the test load is short-circuited, the AC contactor KM1 coil voltage is too low due to the short circuit, which cannot guarantee effective attraction, thereby disconnecting the output fault power supply. When the short-circuit power supply is disconnected, the voltage quickly returns to the normal value, thereby lighting the short-circuit fault lamp to prompt the operator that the load has a short circuit, please check the fault. After pressing the stop reset button 82, the fault can be reset, and the fault lamp is extinguished.
[0041] To ensure the reliability of the device circuit, during normal operation, the short circuit test button 81 can be pressed to simulate a short circuit condition of the load, and the fault lamp is observed. If the fault lamp does not light up, there may be damage to the device circuit, and the air switch 21 should be disconnected to stop using the device. After the short circuit fault is reset or the device is stopped, the start button 83 can be pressed again to start the device and provide power for the test load.
[0042] The device adopts an isolation transformer 9 with a capacity of 100VA, and a very small short-circuit current will be generated at the primary side after the secondary side is short-circuited, and the device has a very strong overload capacity; meanwhile, the short-circuit protection with a voltage of zero is adopted at the secondary side, and when a short circuit occurs, the contactor is automatically powered off due to under-voltage, and the fault power is cut off, so that the protection purpose is achieved, and the fault lamp can be connected to display the short-circuit fault.
[0043] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A power supply device for preventing electric shock and short circuit test, characterized in that: It includes a shell (11), a base (12), and an air switch (21), a first fuse (22), a second fuse (23), an AC contactor, a first relay, a second relay, a third relay, an isolation transformer (9), a power lamp (71), a short circuit lamp (72), a running lamp (73), a short circuit test button (81), a stop reset button (82), and a start button (83) arranged on the base (12); the AC contactor comprises an AC contactor coil (31), an AC contactor normally open contact (32), and an AC 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); 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 connected in series, and the primary winding of the isolation transformer (9) is connected in parallel with the power lamp (71); one end of the first relay normally open contact (42) is connected to the reset input end of the stop reset button (82), the other end of the first relay normally open contact (42) is connected to the common connection point of the first fuse (22) and the power lamp (71), one end of the first relay coil (41) is connected to the reset output end of the stop reset button (82), the other end of the first relay coil (41) is connected to the common connection point of the second fuse (23) and the power lamp (71), and 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 the common connection point of the first fuse (22) and the power lamp (71), one end of the third relay coil (61) is connected to the stop output end of the stop reset button (82), and the other end of the third relay coil (61) is connected to the common connection point of the second fuse (23) and the power lamp (71); The third relay normally closed contact (62) is connected in series with the AC contactor coil (31), 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 AC 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); the first relay normally open contact (42), the AC contactor normally closed contact (33), and the short circuit lamp (72) are connected in series, 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 experimental power supply for preventing electric shock and short circuit according to claim 1, wherein The isolation transformer (9) is a 220V-to-220V isolation control transformer with a capacity of 100VA.
3. The experimental power supply of claim 1, wherein, Also include the terminal block (13), the terminal block (13) is provided on the base (12); the AC contactor, the first relay, the second relay, the third relay are internally wired through the terminal block (13) for finding faults.
4. The experimental power supply of claim 1, wherein, The air switch (21) is connected with external 220V input power through the terminal, and the secondary winding of the isolation transformer (9) is connected with external load through the terminal.
5. The experimental power supply of claim 1, wherein, The stop reset button (82) is a composite button, the reset end is a normally closed button, and the stop end is a normally open button.
6. The experimental power supply of claim 1, wherein, Also include an air circuit breaker, which is connected in parallel with the short circuit test button (81).