KR200484477Y1 - Branch circuit measuring apparatus - Google Patents

Abstract

In order to provide a branch circuit meter and a distribution board device including the branch circuit meter that can ensure the safety of the user by accurately informing the user of the presence or absence of the live floor at the lower end, A voltage output unit for outputting a phase voltage, and a three-phase voltage input unit for comparing the three-phase voltage at a lower end with a predetermined three-phase reference voltage to judge whether the lower end is live or not, An alarm display unit for receiving the first control signal and displaying an alarm according to whether or not there is a live line at the lower end of the load and receiving the first control signal, And the central processing unit judges that the three-phase voltage of the lower stage is a live line if all the three-phase reference voltages are higher than the three-phase reference voltage , And if the three-phase voltage at the lower end is less than the three-phase reference voltage, it is determined as inactive, and if at least one of the three-phase voltages at the lower end is less than the three-phase reference voltage, .

Description

{BRANCH CIRCUIT MEASURING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branching circuit device, and more particularly, to a branching circuit measuring device capable of ensuring the safety of a user by precisely informing a user of whether or not a live wire at a lower end is open or opened.

According to recent technology trends in which importance of energy management in a distribution board device arises, not only electricity quantity information such as current, voltage and electric power of a bus (a main circuit connected to a power supply side) in a distribution board but also information on electricity quantity information of a branch circuit Monitoring and control were required.

Accordingly, a distribution board apparatus including a branch circuit meter provided in the distribution board apparatus for measuring the amount of electricity of the main circuit and the branch circuit and providing measurement information has been developed.

On the other hand, since the conventional branch circuit measuring instrument is installed in the distribution box and there is no separate live state display device, it was judged whether or not the bottom of the branching circuit was active based on the position of the operation handle of the circuit breaker for wiring.

That is, if the operation handle of the circuit breaker is in the ON position, it is judged to be in the live state, and if the operation handle is in the OFF position, it is judged in the inactive state. However, when the inside of the distribution box becomes dark, it is difficult to judge whether the branch circuit is live or not based on the handle position of the circuit breaker.

Particularly, there is a problem that the safety of the user can not be guaranteed when the user performs the management operation in the live state by misjudging the live state.

In addition, even when the circuit breaker is in the ON position and it is determined that the lamp is in the live state, there is a problem that it is difficult to judge whether or not the voltage is faulty if only the operation handle position of the circuit breaker is operated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a branch circuit meter capable of accurately informing a user of whether or not a live wire at a lower end is live and whether or not the wire is live, thereby assuring the safety of the user.

According to an aspect of the present invention, there is provided a branch circuit meter for use in a distribution board device having a circuit breaker for interrupting electrical connection at a lower end, the branch circuit measuring instrument comprising: An output section; A central processing unit which receives the three-phase voltage of the lower stage and compares the received three-phase voltage with a predetermined three-phase reference voltage to determine whether the lower stage is live or not and determines a first control signal according to the determination result, ; An alarm display unit for receiving the first control signal and displaying an alarm according to the presence or absence of an active state at a lower end of the load; And a communication unit for receiving first information data indicating whether or not the lamp unit is live and receiving the first information signal based on the first control signal and for externally transmitting the first information data to the central processing unit, Judges whether the circuit breaker is in the ON state or in the OFF state by using only the three-phase voltage, judges whether the circuit breaker is live or inactive or if the three-phase voltage at the bottom of the circuit breaker is three or more, And determines that the one phase or two phases of the three-phase voltages at the lower ends of the three phases are below the three-phase reference voltage, and determines that the phase is phase-lag .

Further, the apparatus further includes a current output section for outputting a three-phase current at the lower stage detected by the current transformer. The central processing section receives the three-phase current at the lower stage and compares the three- And outputs a second control signal according to the determination result. The alarm display unit receives the second control signal and displays an alarm according to whether or not the load is overloaded. The communication unit receives the second control signal, And transmits the second information data of the lower end overload state to the outside.

Also, the central processing unit determines that the overload of the lower stage is at least one of the three-phase currents at the lower stage if the current is equal to or higher than the three-phase reference current.

The central processing unit receives the leakage current at the lower stage and compares the reference leakage current with a preset reference leakage current to determine whether the current at the lower stage is leaked or not And outputs a third control signal in accordance with the determination result. The alarm display unit receives the third control signal and displays an alarm according to whether or not the current at the lower end is leaked. The communication unit receives the third control signal, And transmits the information data of the leakage to the outside.

Further, the central processing unit determines that the leakage current at the lower end is the leakage current when the leakage current at the lower end is higher than the reference leakage current.

And a main module for displaying the first information data externally or displaying an alarm in accordance with the first information data, wherein the central processing unit determines that the three-phase voltage of the lower stage is all three phase reference voltage or higher If the three-phase voltage of the lower stage is all below the three-phase reference voltage, it is judged as inactive. If one or both of the three-phase voltages of the lower stage are below the three-phase reference voltage,

Since the present invention judges whether or not the lower end of the branch circuit is live or not through the central processing unit of the branch circuit meter and informs the user whether the warning display unit of the branch circuit meter is live or not, There is an effect that can be achieved.

In addition, there is an effect that the presence or absence of a live line at the lower end measured through a plurality of branch circuit meters can be integrally displayed and managed through the main module.

1 is a view showing a distribution board according to an embodiment of the present invention.
Fig. 2 is a diagram showing the embodiment of the branching circuit measuring instrument of Fig. 1;
FIG. 3 is a flow chart for determining whether a branch circuit measuring instrument according to an embodiment of the present invention is active at the lower end and whether or not it is open.
FIG. 4 is a flow chart for determining whether a branch circuit measuring instrument according to an embodiment of the present invention is underloaded or not.
FIG. 5 is a flow chart for determining whether or not a branch current leakage occurs at a branch circuit meter according to an embodiment of the present invention. FIG.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

1 is a view showing a distribution board according to an embodiment of the present invention.

As shown in the drawing, a distribution board 200 according to an embodiment of the present invention includes a main bus bar MB, a main wiring breaker 130, a branch bus bar SB, A circuit breaker 120, a main circuit meter 110, a plurality of branch circuit meters 100 and a main module 150. [

Here, the plurality of branch circuit measuring instruments 100, the main circuit meter 110, and the main module 150 are communicatively connected through the communication line SL.

 The main bus bar MB is connected to the power source (not shown) to supply electric power from a power source (not shown). The main bus bar MB is composed of a long plate type conductor. Four corresponding to each phase (R phase, S phase, T phase, N phase) may be provided.

In addition, one main circuit breaker 130 has a terminal portion connected to the main bus bar MB to open and close the main circuit drawn from the power source (not shown), or to automatically shut off the main circuit when an abnormal current is generated on the main circuit Circuit breakers for low voltages of several hundred volts or less.

The main bus bar MB and the sub-branch circuit breaker 20 are mechanically connected to each other by three branching bars SB corresponding to the respective phases of three phases, And an electric connection path for supplying electric power from a power source (not shown) side to each branch circuit through the sub-wiring breaker 120. [

The plurality of branch circuit interconnection breakers 120 each have one terminal portion connected to the branch bus bar SB and the other terminal portion connected to the branch circuit side so as to open or close the branch circuit, And circuit breakers for low voltages below several hundred volts, which can automatically shut off the circuit.

In addition, one main circuit measuring instrument 110 is installed around a conductor in the form of a bus bar that is connected to the terminal portion of each main circuit breaker 130 or each terminal portion of the main circuit breaker 130, (Not shown) for detecting phases and a processor for calculating a phase current detected by phase-to-phase current transformers (not shown). It is possible to measure the phase current flowing through the main bus bar MB and calculate the detected phase current signal to measure the phase current of the main circuit.

The plurality of branch circuit measuring instruments 100 are installed around the bus bar type conductors connected to the other terminal or the other terminal of the corresponding sub-branch circuit breaker 120, And a processor for calculating a phase current detected by a phase-to-phase current transformer (not shown). The current transformer (not shown) The phase current flowing through the branch circuit for each phase is detected and the signal of the detected phase current is calculated to measure the phase current of the branch circuit.

The plurality of branch circuit measuring instruments 100 are connected to the main module 150 in communication so as to be able to receive the phase voltage of the main circuit from the main module 150 or directly contact the branch circuit to sense the phase voltage have. Then, the phase current can be calculated by integrating the phase current measured by the branch circuit measuring instrument 100 to the phase voltage.

At this time, the calculated power data may be transmitted to the main module 150 in response to the request of the main module 150. [

The main module 50 is connected to the main bus bar MB through a conductor connection line (not shown) and detects the phase voltage of the main circuit using a voltage transformer (not shown) disposed in the main module 50 And transmit the detected data of the phase voltage to each branch circuit measuring instrument 100 via a communication line, specifically, an RS-485 serial communication line.

The main module 150 has a display unit (not shown) such as a liquid crystal display to display the detected phase voltage and the power data provided by the plurality of branching circuit meters 100 through a corresponding display unit (not shown) can do.

The main module 150 has a communication unit (not shown) to communicate with an upper system (not shown) through a communication unit (not shown) And power data to an upper system (not shown).

Fig. 2 is a diagram showing the embodiment of the branching circuit measuring instrument of Fig. 1;

As shown in the figure, the branch circuit measuring instrument 100 includes a voltage output unit 101, a current output unit 102, a leakage current output unit 103, a central processing unit 105, a communication unit 109, A display section 106, and a warning display section 107. [

Specifically, the voltage output unit 101 outputs the three-phase voltage of the lower stage detected by the voltage detection unit (not shown) to the central processing unit 105.

At this time, the central processing unit 105 receives the three-phase voltage of the lower stage and compares the three-phase voltage with a predetermined three-phase reference voltage to determine whether the lower stage is live or not, Respectively.

Further, the central processing unit 105 determines that the three-phase voltage at the lower stage is all the three-phase reference voltage or higher, and determines that the three-phase voltage at the lower stage is lower than the three-phase reference voltage. Phase voltage is less than the three-phase reference voltage.

The alarm display unit 107 receives the first control signal and displays an alarm according to the presence or absence of the live state at the lower end. In addition to the liquid crystal display capable of configuring the display unit 106, a light emitting diode (LED) A lamp or a buzzer.

For example, when the warning display unit 107 is composed of a light emitting diode (LED), the light emitting diode (LED) lights up when the lower end is in a live state, lights off when the lower end is in an inactive state, It can be flickered.

On the other hand, since the conventional branch circuit measuring instrument is installed in the distribution box and there is no separate live state display device, it was judged whether or not the bottom of the branching circuit was active based on the position of the operation handle of the circuit breaker for wiring.

That is, if the operation handle of the circuit breaker is in the ON position, it is judged to be in the live state, and if the operation handle is in the OFF position, it is judged in the inactive state. However, when the inside of the distribution box becomes dark, it is difficult to judge whether the branch circuit is live or not based on the handle position of the circuit breaker.

Particularly, there is a problem that the safety of the user can not be guaranteed when the user performs the management operation in the live state by misjudging the live state.

In addition, even when the circuit breaker is in the ON position and it is determined that the lamp is in the live state, there is a problem that it is difficult to judge whether or not the voltage is faulty if only the operation handle position of the circuit breaker is operated.

However, as described above, the branch circuit measuring instrument 100 according to the embodiment of the present invention accurately informs the user whether the warning display unit 107 is in the active state and whether the warning display unit 107 is live or not, have.

In addition, the communication unit 109 receives the first control signal, and transmits first information data indicating whether or not there is a live line at the lower end to the outside via the communication line SL, that is, to the main module (150 in FIG.

Through this, it is possible to integrally display and manage the presence or absence of the live line of the lower end measured through the plurality of branch circuit meters 100 through the main module (150 in FIG. 1).

That is, the main module 150 of FIG. 1 displays the first information data to the outside through the display unit (not shown) of the main module 150 of FIG. 1 for each branch circuit measuring instrument 100, To display an alarm according to the first information data.

Further, the current output section 102 outputs the three-phase current of the lower stage detected by the current transformer (not shown) to the central processing section 105.

At this time, the central processing unit 105 receives the three-phase current at the lower stage and compares the three-phase current at the lower stage to determine whether the load at the lower stage is overloaded, and outputs a second control signal according to the determination result .

In addition, the central processing unit 105 determines that the overload of the lower stage is at least one of the three-phase currents at the lower stage if the current is equal to or higher than the three-phase reference current.

The alarm display unit 107 receives the second control signal, and displays an alarm according to whether the load is overloaded. The communication unit 109 receives the second control signal and outputs second information data of whether the load is overloaded or not That is, to the main module (150 in FIG. 1).

Through this, it is possible to integrally display and manage the overload state of the lower ends measured through the plurality of branch circuit meters 100 through the main module 150 (FIG. 1).

That is, the main module 150 of FIG. 1 displays the second information data to the outside through the display unit (not shown) of the main module 150 of FIG. 1 for each branch circuit measuring instrument 100, To display an alarm according to the second information data.

The leakage current output unit 103 detects a leakage current at the lower end and outputs the leakage current to the central processing unit 105. The leakage current output unit 103 may be a video current transformer.

At this time, the central processing unit 105 receives the leakage current at the lower stage and compares it with a predetermined reference leakage current to determine whether the current at the lower stage is leaked, and outputs the third control signal according to the determination result.

If the leakage current at the lower end of the central processing unit 105 is equal to or greater than the reference leakage current, the central processing unit 105 determines that the current leakage is at the lower end.

The alarm display unit 107 receives the third control signal and displays an alarm according to whether or not the current at the lower end is leaked. The communication unit 109 receives the third control signal and receives the third information That is, the main module (150 in Fig. 1).

Accordingly, it is possible to integrally display and manage the leakage of current at the lower end measured through the plurality of branching circuit meters 100 through the main module 150 (FIG. 1).

That is, the main module 150 of FIG. 1 displays the third information data to the outside through the display unit (not shown) of the main module 150 of FIG. 1 for each branch circuit measuring instrument 100, To display an alarm according to the third information data.

The above-described first to third information data may be transmitted from the main module (150 in FIG. 1) to a parent system (not shown) through communication.

On the other hand, the central processing unit 105 receives the three-phase voltage and current of the lower stage through the voltage output unit 101 and the current output unit 102, calculates the power based on the received three-phase voltage and current, and displays it on the display unit 106 And can be transmitted to the main module (150 in FIG. 1) through the communication unit 109.

FIG. 3 is a flow chart for determining whether a branch circuit measuring instrument according to an embodiment of the present invention is active at the lower end and whether or not it is open.

As shown in the figure, the three-phase reference voltage Vset is set in advance and the detected three-phase voltages Va, Vb, and Vc are received and compared with the three-phase reference voltage Vset.

At this time, if the three-phase voltages Va, Vb and Vc at the lower stage are all higher than the three-phase reference voltage Vset ((Va? Vset) and (Vb? Vset) and (Vc? Vset) Light emitting diode (LED) lights up.

If all the three-phase voltages Va, Vb and Vc of the lower stage are below the three-phase reference voltage Vset (Va <Vset) and (Vb <Vset) and (Vc <Vset) The light emitting diode (LED) in the active state is turned off.

When one or both of the three-phase voltages Va, Vb, and Vc at the lower ends are less than the three-phase reference voltage Vset, the light emitting diode (LED) is blinked by sensing the liquid crystal state.

FIG. 4 is a flow chart for determining whether a branch circuit measuring instrument according to an embodiment of the present invention is underloaded or not.

As shown in the drawing, the three-phase reference current Iset is set in advance and the detected three-phase currents Ia, Ib, and Ic are input to compare the three-phase reference current Iset.

At this time, if at least one of the three-phase currents Ia, Ib, Ic at the lower stage is equal to or greater than the three-phase reference current Iset ((Ia? The overload state light emitting diode (LED) is turned on when it detects under the overload state, and when it is less than the three phase reference current, the overload state light emitting diode (LED) is turned off.

FIG. 5 is a flow chart for determining whether or not a branch current leakage occurs at a branch circuit meter according to an embodiment of the present invention. FIG.

As shown in the figure, the reference leakage current (ILset) is set in advance, and the detected leakage current (IL) at the lower end is received and compared with the reference leakage current (ILset).

At this time, if the leakage current IL at the lower stage is equal to or greater than the reference leakage current ILset (IL ≥ILset), the current leakage state light emitting diode (LED) is detected by sensing the current leakage state at the lower stage, If it is less than the current (ILset), it is detected as a normal state and the current leakage light emitting diode (LED) is turned off.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

101: Voltage output section
102: Current output section
105:
107: Alarm display unit
109:
150: main module

Claims (4)

A branch circuit meter applied to a distribution board device having a circuit breaker for cutting off electrical connection at a lower end,
A voltage output unit for outputting the three-phase voltage of the negative terminal detected by the voltage detection unit;
A central processing unit which receives the three-phase voltage of the lower stage and compares the received three-phase voltage with a predetermined three-phase reference voltage to determine whether the lower stage is live or not and determines a first control signal according to the determination result, ;
An alarm display unit for receiving the first control signal and displaying an alarm according to the presence or absence of an active state at a lower end of the load; And
And a communication unit that receives the first control signal and transmits the first information data,
Wherein the central processing unit determines whether the wire breaker is in the ON state or the OFF state in a state where the normal operation of the wire breaker is not determined, Phase voltage is less than the three-phase reference voltage, it is determined that the three-phase voltage is less than the three-phase reference voltage, and if the three-phase voltage is less than the three-phase reference voltage, Phase image is less than the three-phase reference voltage.
The method according to claim 1,
Further comprising a current output section for outputting a three-phase current at the lower stage detected by the current transformer,
The central processing unit receives the three-phase current at the lower stage and compares the three-phase current with a predetermined three-phase reference current to determine whether the lower stage is overloaded, outputs a second control signal according to the determination result,
The alarm display unit receives the second control signal and displays an alarm according to whether the load is overloaded,
And the communication unit receives the second control signal and transmits the second information data of the overload state to the outside.
3. The method of claim 2,
And the central processing unit determines that the overload of the lower stage is determined to be overload when at least one of the three-phase currents at the lower stage is greater than or equal to the three-phase reference current.
The method according to claim 1,
And a leakage current output unit for detecting and outputting a leakage current at a lower end,
The central processing unit receives the leakage current at the lower end and compares the reference leakage current with a preset reference leakage current to determine whether or not the current at the lower end is leaked, outputs a third control signal according to the determination result,
The alarm display unit receives the third control signal and displays an alarm according to the leakage of the current at the lower end,
And the communication unit receives the third control signal and transmits the third information data indicating whether or not the current at the lower end is leaked to the outside.

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