KR102211163B1 - Non-contact through sensor module for sensing amount of current between circuit breaker and load - Google Patents

Abstract

The present invention relates to a sensor module sensing the amount of current between a load and a circuit breaker. The present invention includes: a current transformer penetrated by a power line for load-circuit breaker connection and sensing the value of current flowing through the power line; a zero current transformer penetrated by a neutral line and the power line for load-circuit breaker connection and detecting the leakage current flowing to the outside of the power line and the neutral line; an operation status check unit distinguishing the phase of power applied into the sensor module and checking whether the circuit breaker is shut off; and a voltage sensing antenna performing non-contact voltage sensing between the power line and the neutral line in proximity to the lines and sending the result of the sensing to the operation status check unit. According to the present invention, inconvenience attributable to separate wiring can be solved and malfunction attributable to an external impact can be prevented.

Description

Non-contact penetrating sensor module that detects the amount of current between load and breaker {NON-CONTACT THROUGH SENSOR MODULE FOR SENSING AMOUNT OF CURRENT BETWEEN CIRCUIT BREAKER AND LOAD}

The present invention relates to a sensor module for monitoring the amount of current between a load and a breaker, and more particularly, to a sensor module including a voltage sensing circuit for detecting a voltage state of a breaker by a power line extended from the breaker.

In general, a circuit breaker is installed in a distribution board or a switchboard to protect the load by cutting off the supply of power when an abnormal current such as overcurrent or leakage current occurs.

1 is a diagram for explaining the operation of a general circuit breaker, and schematically illustrates an example in which the circuit breaker 10 is mounted on a path through which AC 220V power is transmitted to the load 20. At this time, the breaker 10 is an overcurrent (that is, the electrical circuit connected to the load 20 from the AC power source (i.e., the neutral line (N) (A) and the power line (one of R/S/T)) (B)) , When the current above the rated current) flows, cut off the current flow to prevent accidents.

Recently, in order to reduce the risk of fire due to leakage current, there are increasing cases in which a sensor module capable of measuring the amount of current and leakage current between the circuit breaker 10 and the load 20 is installed.

FIG. 2 is a diagram showing an example of a system configuration in which the sensor module is mounted. Referring to FIG. 2, an electric circuit connected from an AC 220V power source to a plurality of loads 20a (i.e., a neutral wire (N) (A)) And a plurality of breakers 10a are connected on the power line (one of R/S/T) (B)), and a plurality of sensor modules between a plurality of breakers 10a and a plurality of loads 20a (30a) is attached. At this time, the plurality of sensor modules 30a detects leakage currents and current values between the plurality of breakers 10a and the plurality of loads 20a in real time, and the sensed signal (at this time, the sensed The signal is an analog signal) to the controller 40. Then, the controller 40 monitors the leakage current and current values between the plurality of breakers 10a and the plurality of loads 20a by the signal.

3 is a schematic block diagram of each of the sensor modules illustrated in FIG. 2. 2 and 3, the sensor module 30 passes through a power line (one of R/S/T) (B) to sense a current value, and a current transformer (CT) 31 and a neutral wire A video current transformer (ZCT: Zero-phase-) to detect leakage current by means of vector sum by penetrating both (N)(A) and power line (one of R/S/T)(B) and cut off power when abnormal current occurs. Sequence Current Transformer) (32), the operation state check unit (33) that distinguishes the phase of the power applied to the sensor module (30) and checks whether the state of the circuit breaker at the top is being cut off, and the current transformer (CT) (31), an image current transformer (ZCT) 32 and an interface unit 34 that receives the processing result from the operation state check unit 33 and transmits it to the controller 40.

At this time, the operation state check unit 33 is a neutral line (N) (A) and a power line (one of R/S/T) (B) from the wire (voltage detection line) separately wired to the secondary side of the circuit breaker 10. ), and analyzes them to determine the output state of the breaker power. In addition, the voltage reference position for measuring the capacitive leakage current of the circuit breaker is measured by distinguishing the phase of the circuit breaker power supply. On the other hand, the breaker 10 is divided into a primary and a secondary side based on a switch. From the perspective of the breaker 10, the primary side is the power side (source), and the secondary side refers to the load side power.

To this end, the sensor module 30 separately wires a wire (voltage detection line) to the secondary side of the breaker, and by using this, directly applies a voltage of AC 220V or higher transmitted from the secondary side of the breaker to the operation status check unit 33 Give it to you. 4 shows an example of using the sensor module 30.

4 is a diagram illustrating an example of a sensor module to which a separate voltage sensing line is connected according to a conventional embodiment. 3 and 4, the sensor module 30 connected between the breaker 10 and the load 20 connects a neutral wire (N) (A) and a power wire (one of R/S/T) (B). It receives as an input and monitors the overcurrent between the breaker 10 and the load 20. In particular, the sensor module 30 includes an operation status check unit 33 that checks whether or not the breaker 10 is being blocked, and through a separate voltage detection line C from the secondary side of the breaker 10 The transmitted voltage of 220V or higher is directly applied to the operation status check unit 33.

In this case, there is an inconvenience in that a separate line must be additionally connected to the circuit breaker in addition to the actual load wiring, and there is a problem in that the internal circuit may be broken due to an external AC power shock (eg, lightning, noise, etc.).

Korean Patent Registration No. 10-1349659 (Electrical safety interface module connecting branch load and branch circuit breaker)

Therefore, in the present invention, by not separately wiring the voltage detection line for determining the operation state of the circuit breaker when the sensor module is installed, inconvenience caused by the wiring of the voltage detection line can be solved, and failure due to external shock can be prevented. We want to provide a sensor module that is available.

In addition, the present invention has a built-in operation state check unit for measuring the voltage non-contact inside the sensor module, by measuring the current applied from the circuit breaker power source, leakage current and voltage by the operation state check unit, It is intended to provide a sensor module that can determine the operating state.

In addition, the present invention is to provide a sensor module capable of preventing damage or impact of a product due to application of a test voltage by performing electrical inspection in a non-contact manner, and in particular, preventing damage to the product due to an erroneous test.

In order to achieve the above object, the sensor module provided by the present invention is a sensor module that detects the amount of current between a load and a breaker, and detects a current value flowing through the power line by passing through the power line connecting the load and the breaker. A current transformer (CT); An image current transformer (ZCT) for detecting a leakage current flowing out of the power line and the neutral wire by passing through the power line and the neutral line connecting the load and the breaker; An operation state check unit that distinguishes a phase of power applied to the sensor module and checks whether a state of the breaker is being cut off; And a voltage sensing antenna that non-contactly senses a voltage between the power line and the neutral line in proximity to the power line and the neutral line, and transmits the result to the operation state check unit.

Preferably, the voltage sensing antenna may be implemented to have a high impedance capable of sensitively responding to an electric field.

Preferably, the operation state check unit is connected to the antenna, the antenna connection unit for receiving the voltage between the power line and the neutral line sensed in the contactless; A noise removal unit configured to remove high-frequency noise by receiving a voltage between the power line and the neutral line from the antenna connection unit; A shaping processor configured to receive a voltage from which high-frequency noise has been removed through the noise removing unit, and to shape and output the voltage; And a zero-crossing converter configured to receive the standardized signal and perform zero-crossing.

Preferably, the noise removal unit may be implemented as a low pass filter that removes high frequency noise.

Preferably, the shaping processing unit may be implemented as a Schmitt trigger, and the zero crossing conversion unit may perform zero crossing of the voltage phase on the low (L) and high (H) edges of the voltage output from the Schmitt trigger.

The sensor module of the present invention has a built-in operation state check unit that measures voltage non-contact inside the sensor module, and by measuring the current, leakage current and voltage applied from the circuit breaker power source by the operation state check unit, the circuit breaker without contact Can determine the operating state of For this reason, the present invention does not require separate wiring of a voltage sensing line for determining an operation state of a circuit breaker, and there is an advantage in that a failure due to an external shock can be prevented. Accordingly, the present invention has an effect of solving the inconvenience caused by a separate wiring, and improving the durability of the sensor module and the reliability of the measurement result of the sensor module.

In addition, the sensor module of the present invention can prevent damage or impact of a product due to application of a test voltage by performing periodic inspection in a non-contact manner. In particular, it has the advantage of preventing damage to the product due to an incorrect test.

1 is a view for explaining the operation of a general circuit breaker.
2 is a diagram showing an example of a system configuration in which a conventional sensor module is mounted.
3 is a schematic block diagram of each of the sensor modules illustrated in FIG. 2.
4 is a diagram illustrating an example of a sensor module to which a separate voltage sensing line is connected according to a conventional embodiment.
5 is a diagram illustrating an example of a sensor module in which an operation state check unit for measuring a voltage in a non-contact manner is included according to an embodiment of the present invention.
6A and 6B are schematic block diagrams of a sensor module according to the first and second embodiments of the present invention.
7 is a schematic block diagram of an operation state check unit according to an embodiment of the present invention.
FIG. 8 is a view for explaining a comparison between an example in which a sensor module according to an exemplary embodiment is mounted and an example in which the sensor module according to an exemplary embodiment is mounted.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement the present invention. However, the present invention may be implemented in various forms and is not limited to the embodiments described herein. Meanwhile, in the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification. In addition, even if the detailed description is omitted, descriptions of parts that can be easily understood by those skilled in the art have been omitted.

Throughout the specification and claims, when a certain part includes a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

5 is a diagram illustrating an example of a sensor module in which an operation state check unit for measuring a voltage in a non-contact manner is included according to an embodiment of the present invention. 5, the sensor module 300 according to an embodiment of the present invention is connected between the circuit breaker 10 and the load 20, and the neutral line (N) (A) and the power line (R/S/T) One) (B) is received as an input and overcurrent between the circuit breaker 10 and the load 20 is monitored. In particular, the sensor module 300 includes an operation state check unit 330 that measures voltage in a non-contact manner, and the current, leakage current, and voltage applied from the power supply of the breaker 10 by the operation state check unit 330 are By measuring, it is possible to determine the operation state of the circuit breaker without contact.

For this reason, the sensor module 300 according to an embodiment of the present invention does not need to wire a separate voltage sensing line (C of FIG. 4) between the circuit breaker 10 and the circuit breaker 10.

6A and 6B are schematic block diagrams of a sensor module according to the first and second embodiments of the present invention, and FIG. 6A is a schematic block diagram of a sensor module according to the first embodiment of the present invention. 6B is a schematic block diagram of a sensor module according to a second embodiment of the present invention.

First, referring to Figure 6a, the sensor module 300 according to the first embodiment of the present invention is connected between the circuit breaker 10 and the load 20, the leakage current and the current value of the circuit breaker 10 in real time. And outputs the detected signal to an external controller 40.

To this end, the sensor module 300 includes a current transformer 310, an image current transformer 320, an operation state check unit 330, an interface unit (I/F) 340, and a voltage sensing antenna 350.

The current transformer (CT) 310 passes through the power line (one of R/S/T/) (B) connecting the circuit breaker 10 and the load 20 to pass the power line (R/S/T/ One of them) detects the current value flowing in (B).

The zero-phase-sequence current transformer (ZCT) 320 connects the circuit breaker 10 and the load 20 to the power line (one of R/S/T/) (B) and the neutral wire (A). It penetrates and detects the leakage current flowing to the outside of the power line (one of R/S/T/) (B) and the neutral line (A).

The operation state checking unit 330 distinguishes the phase of power applied to the sensor module 300 and checks whether the state of the circuit breaker 10 is being cut off. In particular, the operation state check unit 330 may detect the operation state (eg, ON/OFF) of the circuit breaker 10 by checking the presence or absence of the secondary side power of the circuit breaker 10. That is, the operation state check unit 330 is in the ON state when AC 220V is detected from the secondary side of the circuit breaker 10, and if AC 220V is not detected from the secondary side of the circuit breaker 10, the circuit breaker It is determined that (10) is in the OFF state. To this end, the operation state check unit 330 may receive the secondary power output state of the circuit breaker 10 from the voltage sensing antenna 350.

The interface unit (I/F) 340 receives the processing result from the current transformer (CT) 310, the image current transformer (ZCT) 320, and the operation state check unit 330 and transmits the processing result to the external controller 40. do.

The voltage sensing antenna 350 is close to the power line (one of R/S/T/) (B) and the neutral line (N) (A) connected to the secondary side of the circuit breaker 10, and the power line (R/S/T) One of /) detects the voltage between (B) and the neutral wire (N) (A) in a non-contact manner, and transmits the result to the operation status check unit 330. To this end, it is preferable to implement the voltage sensing antenna 350 to have a high impedance capable of sensitively responding to an electric field. This is because the voltage calculation equation is the same as (Equation 1), and as the value of the impedance Z increases, the influence of the current I on the voltage V increases.

In this case, V is voltage, I is current, and Z is impedance.

In the example of FIG. 6A, the voltage sensing antenna 350 is a power line (one of R/S/T/) applied to the current transformer 310 and the image current transformer 320 from the secondary output of the circuit breaker 10 (B). And a voltage between the power line (one of R/S/T/) (B) and the neutral line (N) (A) in proximity to the neutral line (N) (A) may be sensed in a non-contact manner.

Meanwhile, referring to FIG. 6B, the sensor module 300a according to the second embodiment of the present invention is compared with the sensor module 300 according to the first embodiment of the present invention illustrated in FIG. 6A. ) Is different.

That is, the sensor module 300a according to the second embodiment of the present invention detects the leakage current and current value of the breaker 10 between the breaker 10 and the load 20 in real time, and then externally detects the detected signal. Output to the controller 40 of, for this purpose, a current transformer 310a, an image current transformer 320a, an operation state check unit 330a, an interface unit (I/F) 340a, and a voltage sensing antenna 350a are included. do. At this time, the operation of each of the current transformer 310a, the image current transformer 320a, the operation state check unit 330a, the interface unit (I/F) 340a, and the voltage sensing antenna 350a is illustrated in FIG. 6A. 310), the image current transformer 320, the operation state check unit 330, the interface unit (I/F) 340, and the voltage sensing antenna 350. Accordingly, detailed operation descriptions of each of the current transformer 310a, the image current transformer 320a, the operation state check unit 330a, the interface unit (I/F) 340a, and the voltage sensing antenna 350a will be omitted.

However, in the example of FIG. 6B, the voltage sensing antenna 350a is applied from the secondary side of the circuit breaker 10 and passed through the current transformer 310a (one of R/S/T/) (B) and the neutral wire. (N) (A) close to the power line (one of R/S/T/) (B) and the neutral wire (N) (A) detects the voltage in a non-contact manner, and detects the result of the operation status check unit 330 To pass.

7 is a schematic block diagram of an operation state check unit according to an embodiment of the present invention. 6A and 7, the operation state check unit 330 includes an antenna connection unit 331, a noise removal unit 332, a shaping processing unit 333, and a zero crossing (ZC) conversion unit 334.

The antenna connection unit 331 is connected to the antenna 350 to receive a signal from the antenna 350. That is, the antenna connection part 331 receives the voltage between the power line (one of R/S/T/) (B) and the neutral wire (N) (A) sensed from the antenna 350 in a non-contact manner, and the noise removing part ( 332).

The noise removing unit 332 receives the voltage between the power line (one of R/S/T/) (B) and the neutral line (N) (A) from the antenna connection unit 331, and outputs after removing high-frequency noise. . To this end, the noise removal unit 332 may be implemented as a low pass filter (LPF) that removes high frequency noise.

The shaping processing unit 333 receives the voltage from which the high-frequency noise has been removed from the noise removing unit 332, shaping it, and outputting it to the external controller 40. To this end, the shaping processing unit 333 may be implemented as a Schmitt trigger.

The ZC (Zero Crossing) conversion unit 334 receives the standardized signal from the shaping processing unit 333, performs zero-crossing, and outputs the result to the external controller 40. To this end, the ZC (Zero Crossing) conversion unit 334 performs zero crossing of the voltage phase at the low (L) and high (H) edges of the voltage output from the Schmitt trigger (that is, the shaping processing unit 333). Crossing) can be performed.

FIG. 8 is a diagram for describing a comparison between an example in which a sensor module according to an exemplary embodiment is mounted and an example in which the sensor module according to an exemplary embodiment is mounted. FIG. 8A shows an example in which a sensor module according to a conventional embodiment is mounted, and FIG. 8B shows an example in which a sensor module according to an embodiment of the present invention is mounted.

Referring to Figure 8 (a), the sensor module 30 according to a conventional embodiment connected between the circuit breaker 10 and the load 20 is a neutral wire (N) (A) and a power line ( In addition to the wiring for receiving one of the R/S/T) (B), a separate wire (i.e., voltage sensing line) (C) is wired, which leads to inconvenience in installation and impact on the external AC power source ( For example, there is a problem in that the internal circuit may be broken due to lightning, noise, etc.).

On the other hand, referring to (b) of FIG. 8, the sensor module 300 according to a conventional embodiment connected between the circuit breaker 10 and the load 20 is a neutral wire (N) (A) applied from the circuit breaker and power supply. There is only a wire for receiving the line (one of R/S/T) (B), and does not include the separate wire (ie, voltage sensing line) C. Accordingly, the present invention can solve the above-described installation inconvenience and a problem in that an internal circuit may be broken due to an external AC power shock (eg, lightning, noise, etc.).

In the exemplary system described above, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and certain steps may occur in a different order or concurrently with the steps described above. I can.

In addition, those skilled in the art will appreciate that the steps shown in the flowchart are not exclusive, other steps may be included, or one or more steps in the flowchart may be deleted without affecting the scope of the present invention.

Claims (5)

In the sensor module that detects the amount of current between the load and the breaker,
A current transformer (CT) for sensing a current value flowing through the power line by passing through the power line connecting the load and the breaker;
An image current transformer (ZCT) for detecting a leakage current flowing out of the power line and the neutral wire by passing through the power line and the neutral line connecting the load and the breaker;
An operation state check unit for distinguishing a phase of power applied to the sensor module and checking whether the state of the circuit breaker is being cut off; And
And a voltage sensing antenna for non-contact sensing the voltage between the power line and the neutral line in proximity to the power line and the neutral line, and transmitting the result to the operation state check unit. The method of claim 1, wherein the voltage sensing antenna
A sensor module, characterized in that it is implemented to have a high impedance capable of reacting sensitively to an electric field. The method of claim 1, wherein the operation state check unit
An antenna connection unit connected to the antenna to receive a voltage between the power line and the neutral line detected by the non-contact type;
A noise removing unit for removing high-frequency noise by receiving a voltage between the power line and the neutral line from the antenna connection unit;
A shaping processing unit configured to receive a voltage from which high-frequency noise is removed through the noise removing unit, and to shape and output the voltage; And
A sensor module comprising a zero-crossing converter configured to receive the standardized signal and perform zero-crossing switching. The method of claim 3, wherein the noise removing unit
A sensor module, characterized in that implemented with a low pass filter that removes high frequency noise. The method of claim 3, wherein the shaping processing unit
Implemented as a Schmidt trigger,
The zero-crossing conversion unit
A sensor module, characterized in that performing zero crossing of the voltage phase on the low (L) and high (H) edges of the voltage output from the Schmitt trigger.

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