Broken line detection device for control loop between feeder terminal unit and circuit breaker

Abstract

The utility model relates to the technical field of power distribution automation, in particular to a control loop broken line detection device used between a feeder terminal unit and a circuit breaker, which comprises a broken line detection module and an information uploading module, the broken line detection module is embedded in the feeder terminal unit and is used for realizing opening and closing operation and broken line detection of a control loop, and the information uploading module is used for uploading information to the feeder terminal unit. Comprising an opening loop disconnection detection module and a closing loop disconnection detection module, the information uploading module is used for receiving disconnection detection signals sent by the disconnection detection module and uploading the disconnection detection signals to operation and maintenance software, and the information uploading module comprises a single-chip microcomputer and a control chip connected with the single-chip microcomputer. Compared with the prior art, the I2C bus is adopted for communication with the CPU, so that the resources of the single chip microcomputer are saved; the millisecond-level detection of the broken line of the control loop is realized; the modular design is high in compatibility and can be directly arranged in the existing FTU, and meanwhile later maintenance is facilitated; and related parameters of disconnection are easy to adjust, so that more customization requirements can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power distribution automation technical field, concretely relates to a control loop broken line detection device for between feeder terminal unit and circuit breaker. BACKGROUND

[0002] In the power distribution automation system, the feeder terminal unit (FTU) carries out the switching operation to the circuit breaker, load switch and other equipment through the control loop. When the control loop is broken due to the loose wiring, broken line or contactor failure, it may cause control failure, leading to power interruption and even equipment damage. The traditional detection method relies on manual inspection or simple on-off detection, or single electrical quantity threshold judgment, which has the problems of low sensitivity, high misjudgment rate, high labor cost and inability to alarm in real time, which brings great hidden danger to the power distribution automation system. Therefore, it is of great significance to timely detect the broken line fault in the line and alarm quickly. UTILITARIAN CONTENT

[0003] The utility model provides a control loop broken line detection device for between feeder terminal unit and circuit breaker, and unlike the traditional detection of single electrical quantity (loop voltage or loop current) threshold, the utility model is integrated on the circuit board in the FTU, which can realize the detection of the control loop broken line fault between the FTU and the circuit breaker and timely send the fault information to the monitoring center.

[0004] Based on the above technical problems, the utility model provides a control loop broken line detection device for between feeder terminal unit and circuit breaker, including broken line detection module and information sending module;

[0005] The broken line detection module is embedded in the feeder terminal unit and is used for realizing the switching operation and broken line detection of the control loop, including the triode, the photocoupler and the circuit breaker connected in series, the triode or the photocoupler includes the triode, the photocoupler and the circuit breaker connected in series.

[0006] The information sending module is connected with the broken line detection module and is used for receiving the broken line detection signal sent by the broken line detection module and uploading to the operation and maintenance software, including the single-chip microcomputer and the control chip connected with the single-chip microcomputer, and the control chip is connected with the photocoupler of the tripping circuit broken line detection module and the closing circuit broken line detection module.

[0007] As a preferred, the photocoupler includes the photocoupler front stage and the photocoupler rear stage, the photocoupler front stage is connected with the triode, the photocoupler rear stage is connected with the control chip, and the circuit breaker is connected with the photocoupler front stage and the photocoupler rear stage respectively.

[0008] In order to simplify the circuit structure, reduce the manufacturing cost, the opening circuit loop broken line detection module and the closing circuit loop broken line detection module share a circuit breaker.

[0009] Further, the opening circuit loop broken line detection module comprises a first triode, a first optocoupler front stage, a first optocoupler rear stage and a circuit breaker, the closing circuit loop broken line detection module comprises a second triode, a second optocoupler front stage, a second optocoupler rear stage and a circuit breaker, the first triode is connected with the first optocoupler front stage, the second triode is connected with the second optocoupler front stage, the first optocoupler front stage and the second optocoupler front stage are connected with the circuit breaker respectively, the circuit breaker is connected with the first optocoupler rear stage and the second optocoupler rear stage respectively, and the first optocoupler rear stage and the second optocoupler rear stage are connected with the control chip respectively.

[0010] In a preferred embodiment of the utility model, the control chip adopts PCA9555APW, the CPU adopts STM32F407ZGT6 chip, and I 2 C bus communication is adopted between the CPU and the control chip.

[0011] The utility model has the advantages that, compared with the prior art, the communication mode between the CPU adopts I 2 C bus, single-chip microcomputer resources are saved, millisecond-level detection of the control loop broken line is realized, the modular design has strong compatibility, can be directly built-in in the existing FTU, is convenient for later maintenance, the broken line related parameters are easy to adjust, and more customized needs can be met. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the principle block diagram of the control circuit broken line detection device for the feeder terminal unit and the circuit breaker of the utility model;

[0013] Figure 2 It is the principle block diagram of the specific embodiment of the control circuit broken line detection device for the feeder terminal unit and the circuit breaker of the utility model;

[0014] Figure 3 It is the circuit principle diagram of the control circuit broken line detection device for the feeder terminal unit and the circuit breaker of the utility model;

[0015] Figure 4 It is the circuit principle diagram of the control chip of the utility model. DETAILED DESCRIPTION

[0016] The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and characteristics of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model is more clearly and explicitly defined.

[0017] AsFigure 1 The control loop disconnection detection device for the feeder terminal unit and the circuit breaker includes a disconnection detection module and an information uploading module.

[0018] The disconnection detection module is embedded in the feeder terminal unit and is used for realizing the opening and closing operations of the control loop and the disconnection detection, and includes an opening loop disconnection detection module and a closing loop disconnection detection module.

[0019] The information uploading module is connected with the disconnection detection module, is used for receiving the disconnection detection signal sent by the disconnection detection module and uploading to the operation and maintenance software, and includes a single-chip microcomputer and a control chip connected with the single-chip microcomputer.

[0020] The control chip adopts PCA9555APW, as shown in Figure 4 The CPU adopts an STM32F407ZGT6 chip, and the CPU and the control chip adopt I 2 C bus communication.

[0021] Specifically, as shown in Figure 2 The light coupling includes a light coupling front stage and a light coupling rear stage, the opening loop disconnection detection module and the closing loop disconnection detection module share one circuit breaker, the opening loop disconnection detection module includes a first triode, a first light coupling front stage, a first light coupling rear stage and the circuit breaker, the closing loop disconnection detection module includes a second triode, a second light coupling front stage, a second light coupling rear stage and the circuit breaker, the first triode is connected with the first light coupling front stage, the second triode is connected with the second light coupling front stage, the first light coupling front stage and the second light coupling front stage are connected with the circuit breaker respectively, the circuit breaker is connected with the first light coupling rear stage and the second light coupling rear stage respectively, and the first light coupling rear stage and the second light coupling rear stage are connected with the control chip respectively.

[0022] Specifically, taking the opening loop disconnection detection as an example, as shown in Figure 3 The YB_F signal and the PGND are connected by the circuit breaker switch and together with the triode Q3 to form the light coupling OC1 front stage. Usually, the circuit breaker is closed, the light coupling OC1 front stage and rear stage are both conducted, at this time, the light coupling rear stage FZ_CHECK level changes from high to low, the CPU does not output the disconnection alarm; but when the circuit breaker and the FTU are disconnected at a certain place, the YB_F signal and the PGND are disconnected, the light coupling front stage cannot form a loop, the light coupling rear stage cannot be conducted, the FZ_CHECK signal potential of the light coupling rear stage is always high, the CPU outputs the disconnection alarm and feeds back to the operation and maintenance software.

[0023] The closing circuit and the opening circuit have the same detection principle.

[0024] The working principle of the utility model is as follows:

[0025] The circuit is built in the FTU box, and is connected with the circuit breaker through the external cable via the FTU plug. In this case, if there is no disconnection fault from the FTU to the internal circuit breaker, the light coupling rear stage is turned on, the disconnection signal level is reversed, and then enters the control chip PCA9555APW, and finally enters the CPU. The CPU responds to the signal, and does not output the disconnection alarm. On the contrary, if there is a disconnection fault from the FTU to the internal circuit breaker due to some reason, the light coupling rear stage cannot be turned on, the disconnection signal level remains unchanged, and after entering the CPU through the control chip PCA9555APW, the CPU responds to the signal, outputs the disconnection alarm to the operation and maintenance software, and reminds the power operation and maintenance personnel.

[0026] Finally, it should be pointed out that: the above embodiments are only specific embodiments of the utility model, which are used to illustrate the technical solutions of the utility model, but not to limit them, and the protection scope of the utility model is not limited to this. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments within the technical range disclosed by the utility model, or make equivalent replacement to some technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and range of the technical solutions of the embodiments of the utility model, and all should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A control loop disconnection detection device for a feeder terminal unit and a circuit breaker, comprising a disconnection detection module and an information uploading module, characterized in that: the disconnection detection module is embedded in the feeder terminal unit and is used to realize the opening and closing operations of the control loop and the disconnection detection, comprising an opening loop disconnection detection module and a closing loop disconnection detection module, the opening loop disconnection detection module or the closing loop disconnection detection module comprising a connected triode, an optocoupler and a circuit breaker; the information uploading module is connected with the disconnection detection module and is used to receive the disconnection detection signal sent by the disconnection detection module and upload it to the operation and maintenance software, comprising a single-chip microcomputer and a control chip connected with the single-chip microcomputer, the control chip being connected with the optocouplers of the opening loop disconnection detection module and the closing loop disconnection detection module.

2. Control loop open wire detection apparatus for use between a feeder terminal unit and a circuit breaker according to claim 1, characterized in that: The optocoupler comprises a front-stage optocoupler and a rear-stage optocoupler, the front-stage optocoupler being connected with the triode, and the rear-stage optocoupler being connected with the control chip, the circuit breaker being connected with the front-stage optocoupler and the rear-stage optocoupler respectively.

3. Control loop open wire detection apparatus for use between a feeder terminal unit and a circuit breaker according to claim 2, characterized in that: The opening loop disconnection detection module and the closing loop disconnection detection module share one circuit breaker.

4. Control loop open wire detection apparatus for use between a feeder terminal unit and a circuit breaker according to claim 3, characterized in that: The opening loop disconnection detection module comprises a first triode, a first front-stage optocoupler, a first rear-stage optocoupler and a circuit breaker, the closing loop disconnection detection module comprises a second triode, a second front-stage optocoupler, a second rear-stage optocoupler and a circuit breaker, the first triode being connected with the first front-stage optocoupler, the second triode being connected with the second front-stage optocoupler, the first front-stage optocoupler and the second front-stage optocoupler being connected with the circuit breaker respectively, the circuit breaker being connected with the first rear-stage optocoupler and the second rear-stage optocoupler respectively, and the first rear-stage optocoupler and the second rear-stage optocoupler being connected with the control chip respectively.

5. Control loop open wire detection apparatus for use between a feeder terminal unit and a circuit breaker according to any of claims 1-4, characterized in that: The single-chip microcomputer adopts an STM32F407ZGT6 chip.

6. Control loop open wire detection apparatus for use between a feeder terminal unit and a circuit breaker according to claim 5, wherein: The control chip adopts a PCA9555APW.

7. Control loop open wire detection apparatus for use between a feeder terminal unit and a circuit breaker according to claim 6, wherein: The single-chip microcomputer and the control chip adopt I 2 C bus communication.

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