CN212277939U

CN212277939U - Plug-in active filter module circuit structure

Info

Publication number: CN212277939U
Application number: CN202021222876.8U
Authority: CN
Inventors: 蔡可庆; 姚凯敏
Original assignee: Shanghai Autowell Power Electronics Co ltd
Current assignee: Shanghai Autowell Power Electronics Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-01
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses a plug-in active filter module circuit structure belongs to cubical switchboard filter circuit structure technical field. The circuit breaker comprises a main power circuit, a main breaker, a branch breaker and a filter module; the input end of the branch circuit breaker comprises terminals 1, 3 and 5, the output end of the branch circuit breaker comprises terminals 2, 4 and 6, the output end of the main circuit breaker is connected with a plurality of branch circuit breakers connected in parallel, and each branch circuit breaker is connected with one filter module. By adopting the modularized active filtering device, in the operation process, a single module or a plurality of modules exit due to faults without influencing the operation of other modules, so that the reliability is higher; during fault maintenance, the branch circuit breaker of the module is disconnected, the fault module can be directly taken out, safe plugging is realized, the module is easy to mount and replace, installation and maintenance are not needed after a cabinet, full-front maintenance and online uninterrupted replacement of the module are supported, the continuity of power supply reliability is guaranteed, and meanwhile, the maintenance time and the maintenance amount are greatly reduced.

Description

Plug-in active filter module circuit structure

Technical Field

The utility model relates to a plug-in active filter module circuit structure belongs to cubical switchboard filter circuit structure technical field.

Background

At present, the requirements of electronic markets at home and abroad on the quality of power supplies are higher and higher, and the quality of products is continuously improved in the power electronic industry. Meanwhile, the user can more recognize the harm of high harmonic content of the power grid in the application of the key field, and the active filter can improve the stability of the power system while eliminating higher harmonics. The active filter is developed to the present, and the main improvement directions are quick response, thorough harmonic treatment, good compatibility and high safety and reliability; the structure is gradually developed to be mainly modularized, and active filtering devices with different capacities are formed in a closed switch cabinet in a building block type assembling mode. With the use of a large number of active filter devices, the requirements for safety and convenience during installation and maintenance are also increasingly stringent.

The active filter is in modular design, and has the following characteristics: the method tends to be more standardized in the manufacturing stage of a factory, reduces the specification number of production links, and is more suitable for large-scale and automatic production. Through with the active filter of modularization to cordwood system equipment mode, accomplish the assembly in low-voltage switch cabinet, can constitute the active filter device of different capacities, the dilatation is more convenient. However, there is a defect in the connection installation link of the filter module, and the filter module is generally connected to the module connection insulator (or terminal) and the main power switch terminal (or leading-out copper bar) through a power cable. This type of connection has a drawback in the operation of the device: when the active filter module in operation breaks down, although the operation of other filter modules is not influenced temporarily, the whole active filter device is powered off during maintenance, and the active filter device can be repaired and replaced after safety measures are taken; the cabinet needs to be maintained after disassembly, and is inconvenient and long in maintenance time. If the harmonic content of the power grid is large, the safe operation of some harmonic-sensitive power electronic equipment in the power distribution system is influenced, even the sensitive equipment is damaged, and the fault amplification is easily caused.

Therefore, the plug-in active filter module circuit structure is designed, and is safer and more convenient to install and maintain.

Disclosure of Invention

The utility model discloses the technical problem that will solve lies in: the utility model provides a plug-in active filter module circuit structure, it has solved present active filter module trouble back, needs whole outage, maintains safe and convenient problem inadequately.

The utility model discloses the technical problem that will solve takes following technical scheme to realize:

a plug-in active filter module circuit structure comprises a main power supply circuit and a main circuit breaker, wherein the main power supply circuit comprises a phase line A, B, C, a zero line N and a protection line PE, the input end of the main circuit breaker comprises

terminals

1, 3 and 5, the output end of the main circuit breaker comprises

terminals

2, 4 and 6, the phase line A, B, C is connected from the

terminals

1, 3 and 5 of the main circuit breaker and is connected from the

terminals

2, 4 and 6 of the main circuit breaker, the protection line PE is grounded, and the plug-in active filter module circuit structure also comprises a branch circuit breaker and a filter module;

the input end of the branch circuit breaker comprises

terminals

1, 3 and 5, the output end of the branch circuit breaker comprises

terminals

2, 4 and 6, the output end of the main circuit breaker is connected with a plurality of branch circuit breakers which are connected in parallel, and each branch circuit breaker is connected with one filter module;

wherein, the

terminal

2, 4, 6 of main circuit breaker correspond with the

terminal

1, 3, 5 of every branch circuit breaker and are connected, and the

terminal

2, 4, 6 of every branch circuit breaker are connected with the phase line binding post that the filter module corresponds, and zero line N is connected with the zero line binding post that the filter module corresponds, and the ground terminal ground connection of filter module.

As a preferred example, the phase line and neutral line terminals of the filter module are standard plug-in male connectors.

As a preferred example, the male plug-in unit of the filter module is connected with a female plug-in unit, the female plug-in unit is fixed on a metal plate panel in a switch cabinet, and the other side of the female plug-in unit is connected with the zero line N and the

terminals

2, 4 and 6 of the branch circuit breaker through power cables.

The utility model has the advantages that: by adopting the modularized active filtering device, in the operation process, a single module or a plurality of modules exit due to faults without influencing the operation of other modules, so that the reliability is higher; during fault maintenance, the sampling current transformer secondary side of the fault module is in short circuit on the terminal block, the branch circuit breaker of the module is disconnected, the fault module can be directly taken out, safe plugging is realized, the sampling current transformer is easy to assemble and replace, installation and maintenance are not needed after a cabinet, full-front maintenance and online uninterrupted replacement of the module are supported, power supply reliability continuity is guaranteed, and meanwhile maintenance time and maintenance amount are greatly reduced.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

In the figure: the circuit breaker comprises a main power supply circuit 1, a main breaker 2, a surge protector 3, a branch breaker 4 and a filter module 5.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.

Examples

As shown in fig. 1, a plug-in active filter module circuit structure includes a main power line 1 and a main circuit breaker 2, where the main power line 1 includes a phase line A, B, C, a neutral line N, and a protection line PE, an input end of the main circuit breaker 2 includes

terminals

1, 3, and 5, and an output end of the main circuit breaker 2 includes

terminals

2, 4, and 6, the phase line A, B, C is accessed from the

terminals

1, 3, and 5 of the main circuit breaker 2, the neutral line N and a phase line A, B, C accessed from the

terminals

2, 4, and 6 of the main circuit breaker 2 are accessed to a surge protector 3 together, the surge protector 3, the protection line PE are grounded, and the plug-in active filter module circuit structure further includes a branch circuit breaker 4 and;

the surge protector 3, also called a lightning protector, is an electronic device for providing safety protection for various electronic equipment, instruments and meters and communication lines. When the peak current or voltage is suddenly generated in the electric loop or the communication line due to external interference, the surge protector 3 can conduct and shunt in a very short time, so that the damage of the surge to other equipment in the loop is avoided;

the input end of the branch circuit breaker 4 comprises

terminals

1, 3 and 5, the output end of the branch circuit breaker 4 comprises

terminals

2, 4 and 6, the output end of the main circuit breaker 2 is connected with a plurality of branch circuit breakers 4 which are connected in parallel, and each branch circuit breaker 4 is connected with one filter module 5;

wherein, the

terminals

2, 4, 6 of the main circuit breaker 2 are correspondingly connected with the

terminals

1, 3, 5 of each branch circuit breaker 4, the

terminals

2, 4, 6 of each branch circuit breaker 4 are connected with the phase line wiring terminal corresponding to the filter module 5, the zero line N is connected with the zero line wiring terminal corresponding to the filter module 5, and the grounding terminal of the filter module 5 is grounded.

The phase line and zero line wiring terminals of the filter module 5 adopt standard plug-in type male plug-in components.

The male plug-in components of the filter module 5 are connected with female plug-in components, the female plug-in components are fixed on a metal plate panel in a switch cabinet, and the other side of the female plug-in components is connected with

terminals

2, 4 and 6 of a zero line N and a branch circuit breaker 4 through power cables.

By adopting the modularized active filtering device, in the operation process, a single module or a plurality of modules exit due to faults without influencing the operation of other modules, and the reliability is higher.

During fault maintenance, the sampling current transformer secondary side of the fault module is in short circuit on the terminal block, the branch circuit breaker of the module is disconnected, the fault module can be directly taken out, safe plugging is realized, the sampling current transformer is easy to assemble and replace, installation and maintenance are not needed after a cabinet, full-front maintenance and online uninterrupted replacement of the module are supported, power supply reliability continuity is guaranteed, and meanwhile maintenance time and maintenance amount are greatly reduced.

The reason why the secondary side of the sampling current transformer of the fault module cannot be opened is as follows: in the measuring circuit of the current transformer, the primary side current is determined by a tested circuit, when the resistance of the load is different, the primary side current is also different, when the current transformer is in normal operation, the secondary side of the current transformer is equivalent to short circuit, the secondary side current has strong demagnetization, namely the magnetomotive force of the secondary side is approximately equal to the magnetomotive force of the primary side in magnitude and opposite in direction, so that the synthetic magnetomotive force required by the magnetic flux in the iron core and the corresponding exciting current are very small. If the secondary side is open-circuited, the primary side current is completely changed into exciting current, so that the magnetic flux in the iron core is increased, the iron core is excessively saturated, the iron loss is rapidly increased, and the mutual inductor is heated and damaged; meanwhile, because of the large number of turns of the secondary winding, dangerous high voltage can be induced, and the safety of operators and measuring equipment is endangered. Therefore, during maintenance, the secondary side of the sampling current transformer of the fault module needs to be short-circuited on the terminal block, then the branch circuit breaker of the module is disconnected, and finally the fault module is directly drawn out.

Compared with the existing active filter circuit structure, the circuit structure does not need to be wholly powered off during maintenance, even if the harmonic content of the power grid is high during maintenance, only the filter module 5 with faults needs to be disconnected, other filter modules 5 can still provide a filtering function, the safety operation of some power electronic equipment sensitive to harmonic waves in the power distribution system cannot be greatly influenced, the major damage of the sensitive equipment cannot be caused, the faults can be eliminated under the condition that the normal work of the power distribution system is not influenced, and the power distribution system is safer and more stable.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A plug-in active filter module circuit structure comprises a main power supply circuit and a main circuit breaker, wherein the main power supply circuit comprises a phase line A, B, C, a zero line N and a protection line PE, the input end of the main circuit breaker comprises terminals 1, 3 and 5, the output end of the main circuit breaker comprises terminals 2, 4 and 6, the phase line A, B, C is connected from the terminals 1, 3 and 5 of the main circuit breaker and is connected from the terminals 2, 4 and 6 of the main circuit breaker, and the protection line PE is grounded;

the input end of the branch circuit breaker comprises terminals 1, 3 and 5, the output end of the branch circuit breaker comprises terminals 2, 4 and 6, the output end of the main circuit breaker is connected with a plurality of branch circuit breakers which are connected in parallel, and each branch circuit breaker is connected with one filter module;

wherein, the terminal 2, 4, 6 of main circuit breaker correspond with the terminal 1, 3, 5 of every branch circuit breaker and are connected, and the terminal 2, 4, 6 of every branch circuit breaker are connected with the phase line binding post that the filter module corresponds, and zero line N is connected with the zero line binding post that the filter module corresponds, and the ground terminal ground connection of filter module.

2. The pluggable active filter module circuit structure according to claim 1, wherein the phase and neutral terminals of the filter module are standard pluggable male connectors.

3. The pluggable active filter module circuit structure of claim 2, wherein the male plug-in of the filter module is connected with a female plug-in, the female plug-in is fixed on a metal plate panel in the switch cabinet, and the other side of the female plug-in is connected with the neutral line N and the terminals 2, 4 and 6 of the branch circuit breaker through power cables.