CN104953703B - A kind of dual power supply control cabinet for possessing anti-misoperation function - Google Patents

Abstract

The invention discloses a dual power supply control box with the function of preventing misoperation, which comprises a box body in which a first input/output power supply connection terminal, a second input/output power supply connection terminal, and a four-pole double-throw power supply switch blade are built. , The third input/output power terminal and leakage protection circuit. The backup power supply is input through the second input/output power terminal, and is electrically connected to the input end of the four-pole double-throw power switch blade. The outlet end of the four-pole double-throw power supply switch is electrically connected to the third input/output power terminal through the leakage protection circuit, and is connected to the power supply device through the third input/output power terminal. Compared with the prior art, the present invention has the following advantages: a dual-power supply control box with the function of preventing misoperation, the toolbox is simple in structure, high in reliability, and good on-site durability; Prevent misoperation from causing safety hazards.

Description

A dual power supply control box with anti-misoperation function

technical field

The invention relates to a power supply control box, in particular to a dual power supply control box with the function of preventing misoperation.

Background technique

The power system often encounters on-site power guarantee tasks for major government activities. In order to improve the reliability of power supply, the on-site electrical equipment adopts a two-way power supply mode, one for mains power supply of 380/220V, and the other for generator power , as a backup power supply; under normal circumstances, the on-site electrical equipment is powered by the mains power supply. Once the mains power supply is interrupted due to failure or other reasons, the power supply is switched to the generator power supply to continue power supply through the operation of dual power supplies. Due to the complex and irregular environment of on-site electrical equipment, the operation switching of dual power supplies has great potential safety hazards. In the case of misoperation, it is easy to form an arc short circuit, causing equipment to burn and personnel to be injured. In this field environment, it is very necessary to develop a non-relay type device with load switch protection function.

As a general practice, four-pole double-throw power switch blades are simply used as the main/standby power switch on site. The equipment and field wiring are simple and clear, and the power switch can be clearly disconnected, which meets safety-related requirements. At the same time, the cost is low and the maintenance of the equipment itself is simple. . However, since the four-pole double-throw power switch does not have the arc extinguishing function, if there is a misoperation, when the power is switched under load, an arc short circuit will occur, which will easily cause personal and equipment damage.

However, the dual-power automatic switching devices available on the market have automatic functions and can switch power sources under load, but they cannot meet the simultaneous switching requirements of three-phase four-wire systems, nor do they meet the requirements of visible and obvious power disconnection points. In addition, most of the equipment is installed in the low-voltage switchgear. As its auxiliary equipment, the secondary wiring is complicated, and it is electrically connected with the surrounding corresponding equipment, and the equipment is expensive. Therefore, this equipment cannot be used in the field environment.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a dual-power control box with the function of preventing misuse. The tool box has a simple structure, high reliability, and good durability on site; Prevent misoperation from causing safety hazards.

The present invention is achieved through the following technical solutions: a dual power supply control box with the function of preventing misoperation, including a box body, characterized in that: the first input/output power supply terminal, the second input/output power supply terminal, and the second input/output The output power terminal, the four-pole double-throw power switch, the third input/output power terminal and the leakage protection circuit. The power switch knife is electrically connected; the backup power supply is input through the second input/output power terminal, and is electrically connected to the four-pole double-throw power switch knife; the outlet end of the four-pole double-throw power switch knife passes through the The leakage protection circuit is electrically connected to the third input/output power terminal, and connected to the power supply device through the third input/output power terminal.

As a further optimization of the above scheme, the leakage protection circuit includes a first travel switch, a second travel switch, and a four-pole leakage air switch. The four-pole leakage air switch includes a resistor R and a test button. The four-pole double-throw power supply The four outlet terminals of the switch knife are electrically connected to the four access terminals of the four-pole leakage air switch. After the normally closed contacts of the first travel switch and the second travel switch are connected in series, they are connected to the test Button; the test button is electrically connected to the access terminal of the four-pole leakage air switch after being connected in series with a resistor R.

As a further optimization of the above solution, a first power indicator light is provided between the first input/output power terminal and the four-pole double-throw power switch knife, and the second input/output power terminal is connected to the four There is a second power indicator light between poles and double-throw power switches.

As a further optimization of the above scheme, a third power indicator light is provided between the four-pole double-throw power switch and the four-pole leakage air switch.

As a further optimization of the above solution, an ammeter is connected in series between the third input/output power supply terminal and the leakage protection circuit.

As a further optimization of the above solution, a voltmeter is connected in parallel with the four-pole leakage air switch.

As a further optimization of the above solution, the box body includes a box door, the left side of the box door is provided with a first power indicator light, a second power supply indicator light and a third power supply indicator light, and the right side of the box door is provided with a There are ammeters and voltmeters.

As a further optimization of the above solution, the four-pole double-throw power switch knife is provided with an operating handle.

As a further optimization of the above solution, the backup power supply is a generator power supply.

Compared with the prior art, the present invention provides a dual power supply control box with the function of preventing misoperation, which has the beneficial effects as follows:

1. A dual power supply control box with anti-misoperation function of the present invention has dual power supplies, which are commonly used as mains power supply, and the backup power supply is powered by a generator. The power supply can be switched automatically (manually) according to the charged load. In the event of a power failure, manual operation switches to the backup power supply, which can meet the needs of simultaneous switching of three-phase and four-wire.

2. A dual-power control box with the function of preventing misoperation according to the present invention connects a four-pole double-throw power switch with a four-pole leakage air switch and two travel switches, which ensures that it is accidentally pulled when the mains is normally powered. When the four-pole double-throw power switch is used, the air switch can trip before the switch head is disconnected, so as to prevent the four-pole double-throw power switch from generating arc and then arc short circuit and burn people, which plays a protective role.

3. A dual power supply control box with anti-misoperation function of the present invention, the mains input end is provided with a first power indicator light, the power supply end of power generation is provided with a second power indicator light, and the four-pole double-throw power switch knife output end There is a third power indicator light. During the power supply protection process, the current power supply input and output conditions can be seen at a glance according to the corresponding indicator light.

4. A dual-power control box with anti-misoperation function of the present invention cleverly uses the leakage protection function of the air switch itself to realize the protection circuit function without adding secondary components such as relays. The structure is simple, the cost is low, the equipment maintenance is simple, the reliability is high, and the field durability is strong.

Description of drawings

Fig. 1 is a wiring schematic diagram of a dual power supply control box with the function of preventing misuse according to the present invention.

Fig. 2 is a schematic diagram of the external structure of a dual power supply control box with the function of preventing misoperation according to the present invention.

Fig. 3 is a schematic diagram of the internal structure of a dual power supply control box with the function of preventing misuse according to the present invention.

detailed description

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Referring to Fig. 1-Fig. 3, Fig. 1 is a schematic wiring diagram of a dual-power control box with the function of preventing misoperation according to the present invention. Fig. 2 is a schematic diagram of the external structure of a dual power supply control box with the function of preventing misoperation according to the present invention. Fig. 3 is a schematic diagram of the internal structure of a dual power supply control box with the function of preventing misuse according to the present invention. A dual power supply control box with anti-misoperation function in a preferred embodiment of the present invention includes a box body in which the first input/output power supply terminal 11, the second input/output power supply terminal 12, four-pole Double-throw power switch 14, third input/output power terminal 13 and leakage protection circuit. The 380/220V mains power is input through the first input/output power terminal, and is electrically connected to the input end of the four-pole double-throw power switch 14 . The power supply of the generator is supplied through the second input/output power terminal 12 , and is electrically connected to the input end of the four-pole double-throw power switch blade 14 . The outlet end of the four-pole double-throw power switch 14 is electrically connected to the third input/output power terminal 13 through the leakage protection circuit, and is electrically connected to the power supply device through the third input/output power terminal. The dual power source control box with the function of preventing misoperation of the present invention has dual power source power supply, can automatically switch the power source according to the charged load, and can meet the requirement of simultaneous switching of three-phase four-wire. Wherein, the four-pole double-throw power switch knife is provided with an operating handle. According to the current output situation, the staff can control the closing and opening of the four-pole double-throw power switch knife through the operating handle.

Wherein, the leakage protection circuit includes a first travel switch 16 , a second travel switch 17 and a four-pole leakage air switch 15 . The four-pole leakage air switch 15 includes a resistor R and a test button 18 . The four outlet terminals of the four-pole double-throw power switch 14 are electrically connected to the four access terminals of the four-pole leakage air switch 15. After the normally closed contacts of the first travel switch 16 and the second travel switch 17 are connected in series, and The test button 18 is connected; after the test button is connected in series with the resistor R, it is electrically connected to the access terminal of the four-pole leakage air switch 15 .

Optimally, a first power indicator light 21 is provided between the first input/output power connection terminal 11 and the four-pole double-throw power switch blade 14 to indicate whether the current power supply is input from the mains. A second power indicator light 22 is provided between the second input/output power connection terminal 12 and the quadrupole double-throw power switch blade 14 to indicate whether the current power supply is input through a generator. A third power indicator light 23 is provided between the four-pole double-throw power switch 14 and the four-pole leakage air switch 15, which is used to display whether an output power indication is currently provided.

Wherein, an ammeter is connected in series between the third input/output power terminal 13 and the four-pole leakage air switch 15 for output current indication. The four-pole leakage air switch is connected in parallel with a voltmeter for output voltage indication.

Optimally, the box body includes a box door, and the left side of the box door is provided with a first power indicator 21 , a second power indicator 22 and a third power indicator 23 . The right side of the box door is provided with ammeter 31 and voltmeter 32. The first power supply indicator light, the second power supply indicator light and the third power supply indicator light are all arranged on the box door of the box body, which is convenient for staff to observe the current power supply input and current power supply output conditions. The ammeter and voltmeter are correspondingly arranged on the box door of the box body, which is convenient for the staff to know the current output current and voltage in time. Wherein, an opening is provided under the right side of the box door, through which the four-pole leakage air switch 15 can be exposed, which is convenient for staff to operate the four-pole leakage air switch 15 .

The working principle of the dual-power control box with the function of preventing misoperation of the present invention: the dual-power control box with the function of preventing misoperation of the present invention adds a four-pole The pole leakage air switch uses the leakage test button on the four pole leakage air switch to connect the first stroke switch and the normally closed contact of the first stroke switch in series and connect them to the test button terminal. When the functional dual power supply control box is used for misoperation, when the four-pole double-throw power switch knife is located at the output power supply position of the first input/output power terminal (or the output power supply position of the second input/output power terminal), the handle is initially small Under the action of the displacement, the normally closed contact of the first travel switch (second travel switch) is turned from open to closed, and the closed contact of the second travel switch (first travel switch) of the travel switch forms a short circuit. Before the blade head of the power switch is disconnected, the air switch DL of the leakage protection device is activated to trip, which ensures that there is no load when the blade head of the four-pole double-throw power switch is disconnected.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (7)

1. A dual power supply control box with anti-misoperation function, including a box body, characterized in that: the first input/output power supply terminal, the second input/output power supply terminal, four-pole dual The power supply switch, the third input/output power connection terminal and the leakage protection circuit, the mains power is supplied through the first input/output power connection terminal, and is electrically connected to the four-pole double-throw power switch; standby The power supply is input through the second input/output power terminal, and is electrically connected to the four-pole double-throw power switch knife; the outlet end of the four-pole double-throw power switch knife is connected to the third input through the leakage protection circuit The /output power terminal is electrically connected, and is connected to the power supply device through the third input/output power terminal; The leakage protection circuit includes a first travel switch, a second travel switch and a four-pole leakage air switch. The four-pole leakage air switch includes a resistor R and a test button, and the four outlet terminals of the four-pole double-throw power switch knife Corresponding electrical connection with the four access terminals of the four-pole leakage air switch, the normally closed contacts of the first travel switch and the second travel switch are connected in series, and connected to the test button; the test button is connected in series The resistor R is electrically connected to the access terminal of the four-pole leakage air switch; the four-pole double-throw power switch is provided with an operating handle. 2. A dual-power control box with the function of preventing misoperation according to claim 1, characterized in that: a second power switch is provided between the first input/output power terminal and the four-pole double-throw power switch knife. A power indicator light, a second power indicator light is provided between the second input/output power terminal and the four-pole double-throw power switch blade. 3. A dual-power control box with anti-misoperation function according to claim 1, characterized in that: a third power indicator is provided between the four-pole double-throw power switch and the four-pole leakage air switch lamp. 4. A dual power supply control box with the function of preventing misoperation according to claim 1, characterized in that: an ammeter is connected in series between the third input/output power supply terminal and the leakage protection circuit. 5. A dual-power control box with the function of preventing misoperation according to claim 2, characterized in that: said four-pole leakage air switch is connected in parallel with a voltmeter. 6. A dual-power control box with anti-misoperation function according to claim 1, characterized in that: the box body includes a box door, and the left side of the box door is provided with a first power indicator light, a second Two power indicator lamps and a third power supply indicator lamp, and the right side of the box door is provided with an ammeter and a voltmeter. 7. The dual power supply control box with the function of preventing misoperation according to claim 1, characterized in that: the backup power supply is a generator power supply.