CN208257244U - The protection exclusive circuit and low-voltage distribution cabinet of electrically operated institution - Google Patents

Abstract

The utility model provides a protective locking circuit of an electric operating mechanism and a low-voltage power distribution cabinet, including a secondary power supply circuit of a circuit breaker, a closing circuit of the circuit breaker, and an opening circuit of the circuit breaker. There are switches corresponding to the working position of the drawer and the closing switch of the circuit breaker. The opening switch of the circuit breaker is arranged in series in the opening circuit of the circuit breaker, and the switches corresponding to the test position of the drawer are connected in parallel at both ends of the opening switch. By increasing the drawer working position and test position switch, it forms an electrical lock, avoids the electric operation mechanism to operate under load, and ensures personal safety and reliable operation. The circuit structure of the utility model is simple, practical and reasonable, and has a wide range of applications, meeting the requirements of safe operation. , Reliability, and cost-saving requirements ensure the operating status of the low-voltage power distribution cabinet, and further ensure the safety, stability, economy, and power supply reliability of the power system.

Description

Protection locking circuit and low-voltage power distribution cabinet of electric operating mechanism

technical field

The utility model belongs to the technical field of low-voltage power distribution equipment, in particular to a protective locking circuit of an electric operation mechanism and a low-voltage power distribution cabinet.

Background technique

MNSS and GCS cabinets are commonly used in standard low-voltage power distribution systems and power plant power systems. Among them, the live operation scheme of plastic case for high current is already a trend. In the past, drawer-type circuit breakers generally used manual operation handles to achieve mechanical locking. When performing maintenance on the drawer or checking the circuit-related wiring, it is necessary to ensure that the circuit breaker is in the off state. , since the manual operation handle is equipped with position interlocking mechanisms such as test, connection, separation and withdrawal, switching the manual operation handle to the separation state can make the circuit breaker in the opening state, and when the circuit breaker is in the opening state, it can be turned off The drawer is pulled out for access viewing.

The structure of the live-operated molded case circuit breaker is different from that of the uncharged-operated molded case circuit breaker. The live-operated circuit breaker is generally used in a large current system, which is convenient for electrical operation and saves time and manpower. However, the live-operated molded case circuit breaker does not have a manual operation handle. Due to structural problems, the circuit with a drawer and an operating circuit is easy to operate with power, and there is no mechanical lock. Therefore, the closing and opening can only be operated through the electrical circuit, so there is no way to avoid it. When the electric operator is in the working position and closed state, it is pulled out to the test position. When it is in the closed state, the electric control circuit of the drawer is drawn out. At this time, the live operation does not comply with the maintenance test regulations, and there are unsafe operations and unstable operation of the power circuit, which is easy to cause Low-voltage power distribution system failure or potential safety hazards of personal accidents. In order to solve the above defects, the authorized announcement number is "CN200987045Y", and the Chinese patent titled "Mechanical and Electrical Interlocking Mechanism of Low-Voltage Drawout Type Low-Voltage Distribution Cabinet with Point Operation Drawer" is provided. A kind of interlocking mechanism is developed. The interlocking mechanism jointly controls the opening and closing state of the main circuit breaker by setting the handle and the opening and closing button. However, the circuit structure of this patent is complex and not easy to implement, and a handle needs to be provided, resulting in high cost, impractical circuit, and narrow scope of application.

Utility model content

The purpose of the utility model is to provide a protective locking circuit and a low-voltage power distribution cabinet for the electric operating mechanism, which is used to solve the problem that the circuit structure used when the drawer can only be pulled out when the circuit breaker is in the open state is complicated.

In order to achieve the above purpose, the utility model provides a protective locking circuit of an electric operating mechanism, including a secondary power supply circuit of a circuit breaker, a closing circuit of a circuit breaker and an opening circuit of a circuit breaker, the closing circuit of the circuit breaker The switch corresponding to the drawer at the working position and the closing switch of the circuit breaker are arranged in series in the circuit. The switch corresponding to the test position.

Further, the switch corresponding to the drawer at the working position and the switch corresponding to the drawer at the test position are both travel switches.

As a further definition of the closing switch of the circuit breaker, the closing switch is a manual closing button.

As a further definition of the opening switch of the circuit breaker, the opening switch is a manual opening button.

In order to protect the safety of the power supply circuit, a fuse is arranged in the secondary power supply circuit of the circuit breaker.

The utility model also provides a low-voltage power distribution cabinet, which includes the circuit breaker body and the primary circuit of the circuit breaker, and also includes the protective locking circuit of the electric operation mechanism. The locking circuit includes the secondary power supply circuit of the circuit breaker, the circuit breaker's The closing circuit and the opening circuit of the circuit breaker, the closing circuit of the circuit breaker is provided in series with a switch corresponding to the working position of the drawer and the closing switch of the circuit breaker, and the opening circuit of the circuit breaker is provided in series The opening switch of the circuit breaker, the two ends of the opening switch are connected in parallel with a switch corresponding to the test position of the drawer.

Further, the switch corresponding to the drawer at the working position and the switch corresponding to the drawer at the test position are both travel switches.

As a further definition of the closing switch of the circuit breaker, the closing switch is a manual closing button.

As a further definition of the opening switch of the circuit breaker, the opening switch is a manual opening button.

In order to protect the safety of the power supply circuit, a fuse is arranged in the secondary power supply circuit of the circuit breaker.

The beneficial effects of the utility model are:

The protective locking circuit of the electric operation mechanism of the utility model includes the secondary power supply circuit of the circuit breaker, the closing circuit of the circuit breaker and the opening circuit of the circuit breaker, and the closing circuit of the circuit breaker is provided with a drawer in series. The switch corresponding to the position and the closing switch of the circuit breaker, the opening switch of the circuit breaker is arranged in series in the opening circuit of the circuit breaker, the two ends of the opening switch are connected in parallel with the switch corresponding to the test position of the drawer. By adding drawer working position and test position switches, it forms an electrical lock, avoiding the operation of the electric operating mechanism with load, ensuring personal safety and reliable operation. The circuit structure of the utility model is simple, practical and reasonable, and has a wide range of applications, satisfying operational safety. , Reliable and cost-saving requirements.

The low-voltage power distribution cabinet of the utility model is equipped with a protective locking circuit of the electric operation mechanism, which ensures the normal operation state of the low-voltage power distribution cabinet, and further ensures the safety, stability, economy and power supply reliability of the power system operation.

Description of drawings

Figure 1 is a schematic structural diagram of the protective locking circuit of the electric operating mechanism;

Figure 2 is a schematic diagram of the primary circuit of the circuit breaker.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further:

The utility model provides a low-voltage power distribution cabinet, which includes a circuit breaker body and a primary circuit of the circuit breaker, and also includes a protective locking circuit of an electric operation mechanism. The locking circuit includes a secondary power supply circuit of the circuit breaker and a closing circuit of the circuit breaker. And the opening circuit of the circuit breaker, the closing circuit of the circuit breaker is provided with a switch corresponding to the working position of the drawer and the closing switch of the circuit breaker, and the opening circuit of the circuit breaker is provided with an opening switch of the circuit breaker in series, A switch corresponding to the test position of the drawer is connected in parallel at both ends of the opening switch. When the drawer is pulled out from the closed state of the circuit breaker, the switch contacts corresponding to the test position of the drawer are closed, and the opening circuit of the circuit breaker is connected, so that the circuit breaker is in the open state, ensuring that the drawer can be drawn out normally.

In this embodiment, the switch corresponding to the drawer at the working position and the switch corresponding to the drawer at the test position are all travel switches. As other implementation modes, switches with the same or similar functions can also be selected.

Furthermore, the closing switch is a manual closing button, and as another implementation manner, a switch with an automatic control function may also be used.

Furthermore, the opening switch is a manual opening button, and as another implementation manner, a switch with an automatic control function may also be used.

The secondary power supply circuit of the circuit breaker in this embodiment is provided with a fuse, and the fuse is used to protect the secondary power supply circuit of the circuit breaker and prevent the secondary power supply circuit of the circuit breaker from being burned out.

As shown in Figure 2, the primary circuit of the circuit breaker and the specific structure of the protective locking circuit of the electric operating mechanism are shown in Figure 1, where FU is a fuse, and QF is a live-operated molded case circuit breaker, corresponding to QF:P1 and QF: P2 is AC220V electric power supply; HA is the closing button, TA is the opening button, S11 is the travel switch of the test working position in the drawer, S11 corresponds to the terminal number 1 and 3 and becomes the closed point when it is in the working position, and S11 corresponds to the terminal number 1 and 2 are at the closed point of the test position; the operation of the secondary principle scheme of the electrical circuit is as follows: After the electric operator is connected to the AC220V power supply, the drawer is pushed into the working position, and the closing circuit is connected after pressing the HA button, and the plastic case The circuit breaker is closed and the main circuit is connected; when the drawer is in the test position or the working position, and the molded case circuit breaker is in the closed condition, the opening button TA is operated, the circuit breaker opening circuit is connected, and the circuit breaker is opened. At this point, the drawer can be pulled out safely. When the circuit breaker is in the closed state of the working position, the drawer circuit should be pulled out to the test position for maintenance or to check the circuit-related wiring. When the drawer leaves the working position, the terminals 1 and 2 corresponding to S11 are in the closed state, and the circuit breaker The opening circuit is connected, and the closing circuit of the circuit breaker is forced to be disconnected, which avoids pulling out the drawer when the circuit breaker is in the closed state, and avoids operating the circuit breaker with load, thereby ensuring personal safety and reliable operation of the power system.

The utility model increases the drawer travel switch to form an electrical lock, avoiding the electric operation mechanism to operate under load, ensuring personal safety and reliable operation. Reliable and cost-saving requirements ensure the operation status of the low-voltage power distribution cabinet, and further ensure the safety, stability, economy and power supply reliability of the power system operation.

Specific implementations have been given above, but the utility model is not limited to the above-described implementations. The basic idea of the utility model lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the utility model, it does not need to spend creative labor to design various deformation models, formulas and parameters. Changes, modifications, replacements and deformations to the embodiments without departing from the principle and spirit of the present utility model still fall within the protection scope of the present utility model.

Claims (10)

1. a kind of protection exclusive circuit of electrically operated institution, which is characterized in that secondary current supply circuit, breaker including breaker The sub-gate circuit of closing circuit and breaker, string is equipped with drawer and is in that working position is corresponding to be opened in the closing circuit of the breaker It closes and the closing switch of breaker, the separating brake that string is equipped with breaker in the sub-gate circuit of the breaker switchs, the separating brake is opened It closes both ends and is parallel with drawer in the corresponding switch in test position.

2. the protection exclusive circuit of electrically operated institution according to claim 1, which is characterized in that the drawer is in working position It is travel switch that corresponding switch and drawer, which are in the corresponding switch in test position,.

3. the protection exclusive circuit of electrically operated institution according to claim 1, which is characterized in that the closing switch is manual Switch knob.

4. the protection exclusive circuit of electrically operated institution according to claim 3, which is characterized in that the separating brake switch is manual Opening button.

5. the protection exclusive circuit of electrically operated institution according to claim 4, which is characterized in that the secondary confession of the breaker Fuse is provided in electrical circuit.

6. a kind of low-voltage distribution cabinet, the primary circuit including breaker body and breaker, which is characterized in that further include electric behaviour's machine The protection exclusive circuit of structure, the exclusive circuit include the secondary current supply circuit of breaker, the closing circuit of breaker and open circuit The sub-gate circuit of device, string is equipped with drawer and be in that working position is corresponding to be switched and the conjunction of breaker in the closing circuit of the breaker Lock switchs, and the separating brake that string is equipped with breaker in the sub-gate circuit of the breaker switchs, and the separating brake switch ends are parallel with pumping Drawer is in the corresponding switch in test position.

7. low-voltage distribution cabinet according to claim 6, which is characterized in that the drawer be in working position it is corresponding switch and It is travel switch that drawer, which is in the corresponding switch in test position,.

8. low-voltage distribution cabinet according to claim 6, which is characterized in that the closing switch is closing by hand button.

9. low-voltage distribution cabinet according to claim 8, which is characterized in that the separating brake switch is manual brake separating button.

10. low-voltage distribution cabinet according to claim 9, which is characterized in that set in the secondary current supply circuit of the breaker It is equipped with fuse.