Multipath control shunt measurement and control device

Abstract

The utility model discloses a multipath control shunt measurement and control device, which comprises a lower shell, an upper shell is detachably connected to the lower shell, an accommodating cavity is formed, and a microprocessor, a power supply module, an acquisition and metering module, a remote control and remote signaling module and a communication module are arranged in the accommodating cavity; the microprocessor is respectively connected with the power supply module, the acquisition and metering module, the remote control and remote signaling module and the communication module; and the communication module is respectively connected with the acquisition and metering module and an external load end. The utility model solves the technical problems that the existing device cannot realize synchronous control of multiple load ends, and is complex in structure, large in size and high in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a multi-channel control branch measurement and control device. Background Art

[0002] In a new power load management system, it is necessary to monitor the load of each feeder loop. Currently, the existing technology usually installs a device on each feeder loop to measure and meter the voltage, current, power and electric energy of each loop. For a low-power distribution environment with multiple feeder loops, it is necessary to install multiple devices accordingly, and it is necessary to plan the installation location of each device, and to carry out wiring for voltage, current, communication, etc. The construction is complex and difficult. At the same time, in a new power load management system, it is necessary to control each feeder loop. To achieve the control function, a device with a control function is usually installed on each feeder loop. Each device needs to be connected to a control signal input signal line and two RS485 communication lines on one line. The construction and wiring are complex and difficult. Therefore, it is urgent to propose a multi-channel control branch measurement and control device to solve the technical problems that the existing device cannot achieve synchronous control of multiple load ends, and has a complex structure, large size and high cost. Utility Model Content

[0003] The main purpose of the utility model is to propose a multi-channel control branch measurement and control device, aiming to solve the technical problems that the existing device cannot achieve multi-channel load end synchronous control and has a complex structure, large size and high cost.

[0004] To achieve the above-mentioned purpose, the present invention provides a multi-channel control branch measurement and control device, wherein the multi-channel control branch measurement and control device includes: a lower shell, an upper shell is detachably connected to the lower shell, and a accommodating cavity is formed, and a microprocessor, a power supply module, an acquisition and metering module, a remote control and telesignaling module and a communication module are arranged in the accommodating cavity; the microprocessor is respectively connected to the power supply module, the acquisition and metering module, the remote control and telesignaling module and the communication module; the communication module is respectively connected to the acquisition and metering module and the external load end.

[0005] In one preferred embodiment, the sampling and metering module includes at least two three-phase current sampling circuits and a transformer access status detection circuit, and one three-phase voltage sampling circuit and a metering chip;

[0006] One end of the three-phase voltage sampling circuit is connected to the load end, and the other end of the three-phase voltage sampling circuit is connected to the metering chip through the RC filter circuit, and the metering chip is connected to the microprocessor;

[0007] The three-phase current sampling circuit is connected to the load end and the metering chip respectively;

[0008] The transformer access state detection circuit is connected to the current transformer and the microprocessor respectively.

[0009] In one of the preferred solutions, the metering chip is connected to the microprocessor via an SPI bus.

[0010] In one of the preferred solutions, the current transformer is connected to a multi-channel control branch measurement and control device via an RJ45 plug.

[0011] In one preferred embodiment, the remote control and remote signaling module includes at least two relay output circuits, a disconnection detection circuit, a passive remote signaling input circuit, and one control signal input circuit;

[0012] The relay output circuit and the disconnection detection circuit are connected to the processor and the load end respectively;

[0013] The input ends of the passive remote signal input circuit and the control signal input circuit are connected to the load end, and the output ends of the passive remote signal input circuit and the control signal input circuit are connected to the processor through an optocoupler isolation circuit.

[0014] In one of the preferred solutions, the relay output circuit adopts a normally open single-pole double-throw relay.

[0015] In one of the preferred solutions, the disconnection detection circuit is composed of a voltage divider circuit and an optocoupler isolation circuit.

[0016] In one of the preferred solutions, the passive remote signal input circuit and the control signal input circuit are both connected to the load end via an RS485 bus.

[0017] In one of the preferred solutions, the upper shell and the lower shell are detachably connected by screws.

[0018] In one of the preferred solutions, the communication module is an RS485 communication module.

[0019] In the above-mentioned technical solution of the present utility model, the multi-channel control branch measurement and control device includes a lower housing to which an upper housing is detachably connected, forming a housing chamber. The housing chamber houses a microprocessor, a power module, a data acquisition and metering module, a remote control and telesignaling module, and a communication module. The microprocessor is respectively connected to the power module, data acquisition and metering module, remote control and telesignaling module, and communication module. The communication module is respectively connected to the data acquisition and metering module and an external load terminal. This utility model has a simple structure and is easy to use, solving the technical problems of existing devices that cannot achieve synchronous control of multiple load terminals and are complex in structure, large in size, and high in cost.

[0020] In the utility model, through the acquisition and metering module, one three-phase voltage acquisition and at least two three-phase current acquisitions are set, and the voltage and current of at least two feeder loops can be measured at the same time, and the electric energy of at least two loops can be measured. The structure is simple, practical and convenient, and it is also suitable for small-sized multi-channel control branch measurement and control devices.

[0021] In the utility model, through the remote control and telesignaling module, one control signal input circuit and at least two relay output circuits are provided, and synchronous control of multiple control signal outputs can be completed through the one control signal input circuit; at the same time, at least two feeder loops are connected through the RS485 communication module, that is, by assembling one RS485 line, communication control commands can be sent to at least two feeder loops, and load information of at least two feeder loops can be read, thereby meeting the branch measurement and control device for multi-channel load monitoring; at the same time, through at least two relay output circuits and passive telesignaling input circuits, at least two circuit breakers can be opened at the same time, and the opening status of multiple circuit breakers can also be remotely monitored at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is a first schematic diagram of a multi-channel control branch measurement and control device according to an embodiment of the present utility model;

[0024] Figure 2 This is a second schematic diagram of a multi-channel control branch measurement and control device according to an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the collection and metering module according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of a remote control and remote signaling module according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the upper shell of an embodiment of the present utility model.

[0028] Description of Figure Numbers:

[0029] 1. Upper shell; 2. First circuit board; 3. Second circuit board; 4. Third circuit board; 5. Lower shell; 6. Microprocessor; 7. Power module; 8. Collection and metering module; 9. Remote control and telesignaling module; 10. Communication module.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, etc.) in the implementation mode of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, in this utility model, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0034] Moreover, the technical solutions between the various embodiments of the present invention can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] See also Figure 1-Figure 5 According to one aspect of the present invention, the present invention provides a multi-channel control branch measurement and control device, wherein the multi-channel control branch measurement and control device includes: a lower shell 5, the lower shell 5 is detachably connected to the upper shell 1, and forms an accommodating cavity, and the accommodating cavity is provided with a microprocessor 6, a power module 7, an acquisition and metering module 8, a remote control and telesignaling module 9 and a communication module 10; the microprocessor 6 is respectively connected to the power module 7, the acquisition and metering module 8, the remote control and telesignaling module 9 and the communication module 10; the communication module 10 is respectively connected to the acquisition and metering module 8 and the external load end.

[0036] Specifically, in this embodiment, the microprocessor 6 adopts a 32-bit ARM Cortex M0+ core, integrates 512KB embedded flash memory and 80KB static random access memory. The present invention does not make any specific restrictions, and a conventional microprocessor chip can be used.

[0037] Specifically, in this embodiment, the sampling and metering module 8 includes at least two three-phase current sampling circuits and a mutual inductor access status detection circuit, as well as a three-phase voltage sampling circuit and a metering chip; one end of the three-phase voltage sampling circuit is connected to the load end, and the other end of the three-phase voltage sampling circuit is connected to the metering chip through an RC filtering circuit, and the metering chip is connected to the microprocessor 6; the three-phase current sampling circuit is respectively connected to the load end and the metering chip; the mutual inductor access status detection circuit is respectively connected to the current mutual inductor and the microprocessor 6; in the present utility model, the sampling and metering module 8 is provided with a three-phase voltage sampling circuit, four three-phase current sampling circuits, four metering chips and a mutual inductor access status detection circuit; the three-phase AC voltage is divided into four sampling signals after voltage sampling and transmitted to the metering chip respectively through the RC filtering circuit. The RC filtering circuit improves the stability of the sampling element and avoids interference during the transmission of the sampling signal to cause measurement errors. The value fluctuates; the input end of the three-phase current sampling circuit is connected to the three-phase current, the three-phase current is connected to the device through an open-type current transformer, and the current transformer is connected to the multi-channel control branch measurement and control device through an RJ45 plug; the current transformer is provided with 8 pins, pin 1 of the current transformer is connected to the transformer access status detection circuit, pins 2, 4, and 6 of the current transformer are respectively the input ends of the three-phase currents A, B, and C, pins 3, 5, and 7 of the current transformer are respectively the output ends of the three-phase currents A, B, and C, and pin 8 of the current transformer is grounded; when the current transformer is connected to the device, pins 1 and 8 of the current transformer are short-circuited, and the microprocessor 6 detects the level change and determines that the current transformer is inserted; the three-phase current sampling circuit includes an anti-aliasing circuit and a sampling resistor, and the four-way three-phase circuit is connected to the four-way three-phase current sampling circuit through the current transformer, and the transmission value metering chip is connected to the microprocessor 6 via the SPI bus.

[0038] Specifically, in this embodiment, the metering chip integrates seven Σ-Δ analog-to-digital converters with a resolution of 20 bits, which are used to convert received voltage signals and current signals into digital signals. The voltage signals and current signals are analog signals.

[0039] Specifically, in this embodiment, the remote control and remote signaling module 9 includes at least two relay output circuits, a line break detection circuit, a passive remote signaling input circuit and a control signal input circuit; the relay output circuit and the line break detection circuit are respectively connected to the processor and the load end; the input end of the passive remote signaling input circuit and the control signal input circuit is connected to the load end, and the output end of the passive remote signaling input circuit and the control signal input circuit is connected to the processor through an optocoupler isolation circuit; the line break detection circuit is composed of a voltage divider circuit and an optocoupler isolation circuit; the passive remote signaling input circuit and the control signal input circuit are both connected to the load end through an RS485 bus; in the utility model, the remote control and remote signaling module 9 is composed of four relay output circuits, four line break detection circuits, four passive remote signaling input circuits and a control signal input circuit; the relay output circuit adopts a normally open single-pole double-throw relay, the output has two nodes of normally open and normally closed, the input has two pins to form high and low level control, and the four The relay output circuit is controlled by a double confirmation mechanism of the tripping signal. The input ends of the four relay output circuits are connected to the microcontroller. When the device receives the tripping command sent by the load end through RS485, it is set to a high level, and the control signal input circuit is connected to the control signal input. The control signal input is controlled by the load end. When the load end sends a tripping command through RS485 and receives a reply, the load end sends a pulse control signal to the device through the control signal input line. The pulse width can be configured according to the electrical characteristics of the on-site circuit breaker. When the dual conditions are met at the same time, the relay meets the tripping condition, and the pulse control signal sent by the load end can be directly transmitted to the shunt release of the rear-end circuit breaker, thereby simultaneously controlling the dead circuit breaker to perform real-time tripping; the four remote signal input circuits are composed of a passive input circuit and an optocoupler isolation circuit; in the utility model, the voltage divider circuit, optocoupler isolation circuit, passive input circuit, etc. can all use conventional circuits, and the utility model does not make specific limitations, and can be set according to needs.

[0040] Specifically, in this embodiment, the upper shell 1 and the lower shell 5 are detachably connected by screws; the microprocessor 6 is arranged on the first circuit board 2, the remote control and remote signaling module is placed on the second circuit board 3, the first circuit board 2 and the second circuit board 3 are placed in the accommodating cavity formed by the upper shell 1 and the lower shell 5, the first circuit board 2 and the second circuit board 3 are connected by pins, the power supply module 7 and the sampling and metering module are placed on the third circuit board 4, and the second circuit and the third circuit board 4 are connected by pins.

[0041] Specifically, in this embodiment, the outer surface of the upper shell 1 is provided with a plurality of terminals, including three-phase voltage input terminals, transformer access terminals, relay output terminals, disconnection detection terminals, passive remote signal input terminals, control signal input terminals and RS485 communication terminals, etc. The present utility model does not make specific limitations and the terminals can be set according to needs.

[0042] Specifically, in this embodiment, the remote control and telesignaling module 9 only needs to set up one control signal input line to complete the control of four-way control signal output, without setting up four control signal input lines; the sampling and metering module 8 only needs to set up one set of voltage lines to perform voltage measurement, without setting up four sets of voltage lines, and the access lines are significantly reduced, which greatly reduces the construction difficulty.

[0043] Specifically, in this embodiment, the communication module 10 is an RS485 communication module 10; the communication module 10 is connected to the load end via an RS485 bus.

[0044] Specifically, in this embodiment, in the present utility model, the length, width and height dimensions of the multi-channel control branch measurement and control device are: 126*90*77.5mm, which is not specifically limited in the present utility model and can be set according to needs; compared with the conventional single-channel branch measurement and control device with a size of 90*90*77.5, although the size has increased, the present utility model integrates multiple outputs to at least meet the use of two load ends. The existing technology usually installs a device in each feeder loop to measure and meter the voltage, current, power and electric energy of each loop. For a low-profile power distribution environment with four feeder loops, a total of four devices need to be installed, and each device needs to plan the installation location; in terms of load control, the existing technology usually installs a device with a control function in each feeder loop, and each device must be connected to a control signal input signal line output by the load control terminal. The existing technical solutions are complex and difficult to construct; in the present utility model, the multi-channel control branch measurement and control device can meet the use of four load ends; it is specially used in scenarios where the functions of multiple feeder circuits are consistent, such as air conditioning, lighting and other loads. The device has one voltage and four current inputs at the same time, and can measure the voltage, current and power of four feeder circuits at the same time, as well as measure the electric energy of the four circuits. The device only needs to connect to one control signal input signal line to synchronously control the four circuits, and the device only needs a set of two RS485 lines to send communication control commands to the four circuits. At the same time, the device has four relay outputs and four telesignaling inputs, which can simultaneously open four circuit breakers and simultaneously perform telesignaling monitoring on the opening and closing states of the four circuit breakers. The utility model has low cost, small size, and low construction difficulty, and is suitable for application scenarios where multiple feeder circuits need to trip at the same time.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A multi-channel control branch measurement and control device, characterized in that: include: The lower shell is detachably connected to the upper shell and forms an accommodating cavity. The accommodating cavity is provided with a microprocessor, a power supply module, an acquisition and metering module, a remote control and telesignaling module, and a communication module; the microprocessor is respectively connected to the power supply module, the acquisition and metering module, the remote control and telesignaling module, and the communication module; the communication module is respectively connected to the acquisition and metering module and the external load end.

2. A multi-channel control branch measurement and control device according to claim 1, characterized in that: The acquisition and metering module includes at least two three-phase current sampling circuits and a transformer access status detection circuit, and one three-phase voltage sampling circuit and a metering chip; One end of the three-phase voltage sampling circuit is connected to the load end, and the other end of the three-phase voltage sampling circuit is connected to the metering chip through the RC filter circuit, and the metering chip is connected to the microprocessor; The three-phase current sampling circuit is connected to the load end and the metering chip respectively; The transformer access state detection circuit is connected to the current transformer and the microprocessor respectively.

3. A multi-channel control branch measurement and control device according to claim 2, characterized in that: The metering chip is connected to the microprocessor via an SPI bus.

4. A multi-channel control branch measurement and control device according to claim 2, characterized in that: The current transformer is connected to the multi-channel control branch measurement and control device through an RJ45 plug.

5. A multi-channel control branch measurement and control device according to any one of claims 1 to 4, characterized in that: The remote control and remote signaling module includes at least two relay output circuits, a disconnection detection circuit, a passive remote signaling input circuit and a control signal input circuit; The relay output circuit and the disconnection detection circuit are connected to the processor and the load end respectively; The input ends of the passive remote signal input circuit and the control signal input circuit are connected to the load end, and the output ends of the passive remote signal input circuit and the control signal input circuit are connected to the processor through an optocoupler isolation circuit.

6. A multi-channel control and branch measurement and control device according to claim 5, characterized in that: The relay output circuit adopts a normally open single-pole double-throw relay.

7. The multi-channel control and branch measurement and control device according to claim 5, characterized in that: The disconnection detection circuit is composed of a voltage divider circuit and an optocoupler isolation circuit.

8. The multi-channel control and branch measurement and control device according to claim 5, characterized in that: The passive remote signal input circuit and the control signal input circuit are both connected to the load end via the RS485 bus.

9. A multi-channel control and branch measurement and control device according to any one of claims 1 to 4, characterized in that: The upper shell and the lower shell are detachably connected by screws.

10. A multi-channel control and branch measurement and control device according to any one of claims 1 to 4, characterized in that: The communication module is an RS485 communication module.

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