Low-voltage reactive compensation controller for remotely cutting off capacitance compensation through load control terminal

Abstract

The utility model discloses a low-voltage reactive automatic compensation controller capable of remotely cutting capacitance compensation through a load control terminal, which comprises a shell and a processing control unit arranged in the shell, and the processing control unit comprises a microprocessor, a sampling circuit connected with the microprocessor and an output control circuit connected with the microprocessor. The processing control unit further comprises a storage unit connected with the microprocessor; the processing control unit further comprises an RS485 communication circuit connected with the microprocessor. According to the utility model, the structure is reasonable, remote switch control operation can be realized, the control stability and reliability are improved, the workload of operators is reduced, the maintenance and operation cost is reduced, the control condition can be recorded through the storage unit, the inspection is convenient, the use effectiveness is improved, and the use cost is reduced. The switching selection of three different output interfaces can be realized by controlling the output interface module, the use requirements under different conditions can be met, and the applicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of reactive power compensation control, and particularly relates to a low-voltage reactive power compensation controller for remotely cutting off capacitor compensation through a negative control terminal. Background Technique

[0002] At present, in the low-voltage reactive power compensation system, under the condition of light load or no load, the compensation capacitor often mis-operates and is put into operation, resulting in over-compensation of reactive power and possibly causing too high terminal voltage, which poses a safety hazard. Therefore, in the actual application process, corresponding technical personnel are required to shut down the reactive power compensation equipment on-site, which requires a large amount of manpower and material resources, and the control convenience is relatively limited, thus greatly increasing the use cost and being difficult to meet the market demand, and the applicability is restricted. Content of the Utility Model

[0003] The purpose of the utility model is to provide a low-voltage reactive power compensation controller for remotely cutting off capacitor compensation through a negative control terminal, which has reasonable structural setting and convenient control.

[0004] The technical solution for realizing the purpose of the utility model is a low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal, including a housing, a processing and control unit arranged in the housing, and the processing and control unit includes a microprocessor, a sampling circuit connected to the microprocessor for collecting input of voltage and current signals of the distribution power grid, and an output control circuit connected to the microprocessor for realizing output of control switching signals;

[0005] The sampling circuit is connected to the distribution power grid, and the output control circuit is connected to the switching switch;

[0006] The processing and control unit further includes a storage unit connected to the microprocessor for storing and recording switching records, measurement parameters and alarm times;

[0007] The processing and control unit further includes an RS485 communication circuit connected to the microprocessor for transmitting data to the terminal device and remote control.

[0008] Further preferably: the processing and control unit further includes a control output interface module connected to the microprocessor for selecting the output interface mode;

[0009] The control output interface module is connected to a capacitor AC contactor, a composite switch and an RS485 communication circuit, and is used for selecting one of the capacitor AC contactor, the composite switch and the RS485 communication circuit for output.

[0010] Further preferably, the processing control unit further includes a human-machine controller connected to the microprocessor for realizing human-machine interaction, and a negative control signal input detection circuit connected to the microprocessor for realizing the detection of negative control signal input.

[0011] Further preferably, the microprocessor is a single-chip microcomputer with the chip model MM32SPIN27PS.

[0012] Further preferably, the negative control signal input detection circuit includes a passive dry contact interface.

[0013] The utility model has positive effects: The structure of the utility model is reasonably arranged. Through the cooperation of the microprocessor, the sampling circuit, the output control circuit, and the RS485 communication circuit, remote switch control operations can be realized, improving the smoothness and reliability of control, reducing the workload of operators, reducing maintenance and operation costs, and the control situation can be recorded through the storage unit, facilitating inspection, improving the use effectiveness, and three different output interfaces can be switched and selected through the control output interface module, which is beneficial to meeting the use requirements in different situations, with more convenient operation and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to specific embodiments in conjunction with the drawings, where:

[0015] Figure 1 is the structural schematic diagram of the utility model;

[0016] Figure 2 is the specific circuit schematic diagram of the negative control signal input detection circuit in the utility model;

[0017] Figure 3 is the connection schematic diagram of the composite switch and the microprocessor in the utility model;

[0018] Figure 4 is the schematic diagram of the passive dry contact interface circuit in the utility model;

[0019] Figure 5 is the specific circuit schematic diagram of the RS485 communication circuit in the utility model.

[0020] Reference numerals: microprocessor 1, sampling circuit 2, output control circuit 3, storage unit 4, RS485 communication circuit 5, human-machine controller 6, negative control signal input detection circuit 7, control output interface module 8, capacitor AC contactor 9, composite switch 10, terminal device 11. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment

[0023] See Figures 1 to 4 As shown, a low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal includes a housing, and a processing and control unit disposed in the housing. The processing and control unit includes a microprocessor 1, a sampling circuit 2 connected to the microprocessor for collecting input signals of the voltage and current of the distribution power grid, and an output control circuit 3 connected to the microprocessor for realizing the output of the control switching signal; the microprocessor is a single-chip microcomputer with a chip model of MM32SPIN27PS. When connecting, the sampling circuit is connected to the distribution power grid, and the output control circuit is connected to the switching switch; the microprocessor completes the voltage and current of the distribution power grid through the sampling circuit and analyzes power factor, active power, reactive power, harmonic and other electrical parameters through a dedicated metering chip, and realizes the start of output control through the output control circuit, realizing remote switch control operation, improving the convenience and stability of use;

[0024] Moreover, in this embodiment, the processing and control unit further includes a storage unit 4 connected to the microprocessor for storing and recording switching records, measurement parameters, and alarm times; it is convenient for manual modification or viewing of corresponding data, facilitating manual analysis and judgment of the control situation, and being beneficial to maintenance operations. At the same time, the processing and control unit further includes an RS485 communication circuit 5 connected to the microprocessor for transmitting data to the terminal device 11 and remote control. Remote terminal control operations can be realized, improving the effectiveness and reliability of control.

[0025] In this embodiment, the processing and control unit further includes a human-machine controller 6 connected to the microprocessor for realizing human-machine interaction, and a negative control signal input detection circuit 7 connected to the microprocessor for realizing the detection of negative control signal input. The negative control signal input detection circuit includes a passive dry contact interface. Remote control operations can be realized through the human-machine controller, and at the same time, the input signal can be inspected and judged through the negative control signal input detection circuit, improving the control accuracy and effectiveness.

[0026] In this embodiment, the processing control unit further includes a control output interface module 8 connected to the microprocessor for selecting an output interface mode; the control output interface module is connected to a capacitor AC contactor 9, a composite switch 10, and an RS485 communication circuit, and is used to select one of the capacitor AC contactor, the composite switch, and the RS485 communication circuit for output. It can realize the switching or replacement of three interface modes, meet the usage requirements in different situations, and improve the usage convenience and effectiveness.

[0027] Figure 2 In the OUTCTR is connected to the pin of the microprocessor, and the YK FKB is connected to the negative control signal input detection circuit 7;

[0028] Figure 3 In, the IN1-IN12 are connected to the pins of the microprocessor, and the O1-O12 are connected to the composite switch 10;

[0029] Figure 4 In, the IN1-IN6 are connected to the pins of the microprocessor, and the COM and O6 are externally connected to the capacitor AC contactor 9.

[0030] Figure 5 In, the MCU RXD, MCU CTR, and MUC TXD are respectively connected to the pins of the microprocessor, and the RS485-A and RS485-B are connected to the control output interface module 8.

[0031] The utility model has positive effects: The structure of the utility model is reasonably arranged. Through the cooperation of the microprocessor, the sampling circuit, and the output control circuit, and in cooperation with the RS485 communication circuit, remote switch control operations can be realized, improving the smoothness and reliability of control, reducing the workload of operators, reducing maintenance and operation costs, and the control situation can be recorded through the storage unit, facilitating inspection, improving the usage effectiveness, and three different output interfaces can be switched and selected through the control output interface module, which is beneficial to meeting the usage requirements in different situations, is more convenient to operate, and has strong applicability.

[0032] The standard parts used in this embodiment can be directly purchased from the market. For the non-standard structural components described in the instruction manual, they can also be directly processed without doubt according to the existing technical common sense. At the same time, the connection methods of each component adopt the mature conventional means in the existing technology, and the machines, parts, and equipment all adopt the conventional models in the existing technology, so no specific description will be made here.

[0033] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And these obvious changes or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal, comprising a housing and a processing and control unit arranged in the housing, characterized in that: The processing control unit includes a microprocessor, a sampling circuit connected to the microprocessor for collecting input of power distribution grid voltage and current signals, and an output control circuit connected to the microprocessor for realizing output of control switching signals; The sampling circuit is connected to the power distribution grid, and the output control circuit is connected to the switching switch; The processing control unit further includes a storage unit connected to the microprocessor for storing switching records, measurement parameters and alarm times; The processing control unit further includes an RS485 communication circuit connected to the microprocessor for transmitting data to the terminal device and remote control; 2. The low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal according to claim 1, characterized in that: The processing control unit further includes a control output interface module connected to the microprocessor for selecting an output interface mode; The control output interface module is connected to the capacitor AC contactor, the composite switch and the RS485 communication circuit, and is used to select one of the capacitor AC contactor, the composite switch and the RS485 communication circuit for output; 3. The low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal according to claim 2, characterized in that: The processing control unit further includes a human-machine controller connected to the microprocessor for realizing human-machine interaction, and a negative control signal input detection circuit connected to the microprocessor for realizing negative control signal input detection; 4. The low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal according to claim 1, wherein: The microprocessor is a single-chip microcomputer with the chip model of MM32SPIN27PS; 5. The low-voltage reactive power automatic compensation controller for remotely cutting off capacitor compensation through a negative control terminal according to claim 3, characterized in that: The negative control signal input detection circuit includes a passive dry contact interface.

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