KR100741507B1 - System for electrical safety diagnostic using Personal Digital Assistants - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical safety inspection system using PD, which detects a minute leakage current of a low frequency component, detects a current waveform and a high frequency arc voltage waveform that are distorted when an arc occurs due to insulation breakdown, and grounds a home appliance. Detect resistance, receive, analyze, calculate, and store detection data such as the detected leakage current, distorted current waveform, high frequency arc voltage waveform, and ground resistance; An electrical safety device for storing a unique identification ID of the electronic device, transmitting and receiving the PD, and cutting off power according to the detection data such as leakage current, arc, and overcurrent generated over a power line; And a PD which transmits and receives with the electric safety device, and stores the detection data received from the electric safety device, and processes the detected data to output the stored detection data. Characterized in that it comprises a.

RF transceiver module, PD, electrical safety inspection, arc detection

Description

System for electrical safety diagnostic using Personal Digital Assistants

1 is a block diagram of an electric safety check system using a PD in accordance with an embodiment of the present invention.

2 is a block diagram of an electric safety device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a PDA and detection data received from an electric safety device according to an embodiment of the present invention.

4 is a vector diagram for calculating an insulation resistance based on the detected leakage current value according to an embodiment of the present invention.

5 is a view showing the waveform of the current appeared when the arc according to an embodiment of the present invention.

6 is a view showing a load current waveform of the dimmer according to an embodiment of the present invention.

7 is a view showing a distortion waveform of a dimmer according to a change in firing angle according to an embodiment of the present invention.

8 illustrates a high frequency arc voltage waveform according to an embodiment of the present invention.

The present invention relates to an electrical safety inspection system, and more particularly, after installing an electrical safety device in a home distribution board, a power supply used in a home distribution board by using a PD equipped with an RF transceiver capable of two-way transmission and reception with the electrical safety device. The present invention relates to an electrical safety inspection system using a PD to check the status from the outside.

Most home electrical safety checks are to check the insulation resistance on the secondary side of the branch switch and the overheating condition of the earth resistance switch of the home appliance. This is a method in which an inspector carrying a PD visits each generation and inputs the contents into the PD. In some cases, an input or a missing occurs.

Recently, a method of directly reading the amount of power of a meter has been developed, and data is wirelessly transmitted. However, since a single channel is used instead of multiple channels, there is a shortage of receiving data of various power sources.

The present invention is to solve the above problems, installs an electrical safety device for detecting leakage current, arc voltage and ground resistance generated in the home distribution board, and a PD equipped with an RF transceiver capable of two-way transmission and reception with the electrical safety device It is an object of the present invention to provide an electrical safety inspection system using PDA that can externally check the power supply state used in home distribution panels.

In addition, an object of the present invention is to provide an electrical safety inspection system using a PD, which can receive data of various power sources by using a multi-channel method instead of a single channel.

The present invention for achieving the above object, the present invention relates to an electrical safety inspection system using a PD, detects a minute leakage current of the low frequency component, and detects the waveform of the current and the high frequency arc voltage waveform that is distorted when the arc generated due to dielectric breakdown Detects ground resistance of home appliances, receives, analyzes, calculates, and stores detected data such as the detected leakage current, distorted current waveform, high frequency arc voltage waveform, and ground resistance; An electric safety device for storing a unique identification ID of a distribution panel in a home designated for the purpose of transmission and reception with the PD, and shutting off the power according to the detection data such as leakage current, arc, overcurrent, etc. generated throughout the power line; And a PD which transmits and receives with the electric safety device, and stores the detection data received from the electric safety device, and processes the detected data to output the stored detection data. Characterized in that it comprises a.

Preferably, the electrical safety device, the leakage current detection unit for detecting a minute leakage current of the low frequency component; A current waveform detector for detecting a waveform of a current that is distorted when an arc occurs due to insulation breakdown; A voltage waveform detector detecting a high frequency arc voltage waveform that is distorted when an arc is generated due to dielectric breakdown; A ground resistance detector for detecting ground resistance of home appliances; A printed circuit board, which receives, analyzes, calculates, and stores data detected by the leakage current detector, the current waveform detector, the voltage waveform detector, and the ground resistance detector, and uniquely identifies a distribution panel in a home designated for transmission and reception with the PD. A control circuit unit for storing an ID and transmitting / receiving with the PD; And a power cut-off unit which cuts off the power in accordance with detection data such as leakage current, overcurrent, arc, etc. generated over the entire power line received by the control circuit unit. Characterized in that it comprises a.

Also preferably, the electrical safety device, the temperature detection unit for detecting the temperature occurring across the power line and the display unit for outputting the current situation of the power line; It characterized in that it further comprises.

More preferably, the control circuit unit may receive, analyze, calculate, and store data detected by the leakage current detector, the current waveform detector, the voltage waveform detector, and the ground resistance detector, and transmit and receive data to and from the home appliance. A storage module for storing a unique identification ID of the RF transmission / reception module for transmitting and receiving with the PD, and a control module for controlling the storage module and the RF transmission / reception module; Characterized in that it comprises a.

And preferably the inspection apparatus comprises: an inspection software for storing the RF transmission / reception unit for transmitting and receiving with the electrical safety device and the detection data received from the electrical safety device, and processing the data to be output to the PD. Characterized in that it comprises a.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figures 1 to 3 with respect to the configuration of the electrical safety inspection system using a PD in accordance with an embodiment of the present invention.

The electric safety inspection system using a PD is composed of an electrical safety device 100 and the PD 200 (200).

Prior to this, the leakage current detector 110, the current waveform detector 120, and the power cut-off unit 160 are installed in the circuit breaker of the home distribution panel, and are hereinafter referred to as the voltage waveform detector 130, the ground resistance detector 140, and the control unit. It is preferable to understand that the circuit unit 150 is installed outside the breaker.

As shown in FIG. 1, the electrical safety device 100 includes a leakage current detector 110, a current waveform detector 120, a voltage waveform detector 130, a ground resistance detector 140, a control circuit unit 150, and a power supply. It includes a blocking unit 160.

In detail, as illustrated in FIG. 2, the leakage current detection unit 110 includes a ZCT (Zero Current Transformer) to detect minute leakage current. ZCT is provided with a ring-shaped iron core capable of detecting only low frequency components, and functions to detect a microcurrent in [k].

In addition, the current waveform detection unit 120 in accordance with one aspect of the present invention has a built-in CT (Current Transformer: Current Transformer), and serves to detect the waveform of the current is distorted when the arc occurs due to dielectric breakdown.

In addition, the voltage waveform detection unit 130 according to an aspect of the present invention functions to detect a high frequency arc voltage waveform that is distorted when an arc occurs due to insulation breakdown by using a high frequency transformer.

In addition, the ground resistance detector 140, as shown in Figure 2, by adopting a one-point grounding method connected to a home appliance, such as a lamp, a washing machine, a refrigerator by one ground point to detect the ground resistance through a separate resistance detector Do it.

In addition, the control circuit unit 150 is in the form of a printed circuit board (PCB), and includes a storage module 151, an RF transmission / reception module 153, and a control module 152.

The storage module 151 receives, analyzes, calculates and stores data detected by the leakage current detector 110, the current waveform detector 120, the voltage waveform detector 130, and the ground resistance detector 140, and transmits and receives data to and from the PD. The unique identification ID of the distribution panel in the pre-designated home is stored. The RF transmission / reception module 153 transmits / receives a function with the PD, and the control module 152 controls the storage module 151 and the RF transmission / reception module 153.

The power cut-off unit 160 has a built-in trip coil, and the trip coil is excited according to detection data such as leakage current, arc, and over current received by the control circuit unit 150 throughout the power line. It cuts off the power.

Here, the electronic device may further include a temperature detector 170 for detecting a temperature occurring across the power line of the electric safety device 100 and a display unit 180 for outputting a current state of the power line.

Next, the PD 200, the RF transceiver 210 for transmitting and receiving with the RF transceiver module 153 of the control circuit unit 150 and the RF transceiver module 153 of the electrical safety device 100 as shown in FIG. And the inspection software 220 which stores the detection data received from the N-TD and processes it to be output to the PD.

The RF transmission / reception module 153 of the electric safety device transmits the stored detection data when the inspector requests the detection data through a predetermined unique identification ID, and the configuration thereof may be expressed as an example.

(1) basic FORMAT

▼ L1 (2BYTE) = COMMAND + DATA LENGTH

▼ ID (8BYTE) = 10001234

▼ DATA (Total 32BYTE in 4BYTE) = Current, Voltage, Apparent Power, Active Power, Leakage Current, Insulation Resistance, Ground Resistance, Temperature Value

▼ BCC = L1 ～ ETX XOR

(2) PDA-> HOST (in case of sending detection data transmission request signal from PD 200 to electric safety device 100)

(3) HOST-> PDA (when detection data is transmitted from the electric safety device 100 to the PD 200)

In other words, the RF transceiver 210 of the PD 200 and the RF transceiver module 153 of the electrical safety device 100 installed in the home distribution panel can be transmitted and received in the above manner.

Hereinafter, an operation example of the electrical safety inspection system having the above-described configuration will be described with reference to FIGS. 4 to 8.

First, the operation of detecting leakage current and insulation resistance will be described.

The leakage current detector 110 installed in the circuit breaker detects a microcurrent in [kV] using ZCT. The detected current is shown in FIG. 4 as an apparent leakage current value Io including a capacitive reactance component and an inductive reactance component.

Here, the control circuit unit 150 receives the apparent leakage current value detected from the leakage current detection unit 110, retrieves the phase difference between the voltage and the current based on the incoming power supply voltage, and then the following [Equation] Calculate the leakage current value of pure resistive component by insulation breakdown.

[Equation]

Io ² = Ic ² + Ir ² where

In addition, the control circuit unit 150 calculates the insulation resistance by using an equation such as R = Vo / Ir [㏁].

Next, the operation of detecting arcs using waveforms of unspecified distortion current and high frequency arc voltage waveforms will be described.

As illustrated in FIG. 5, the current waveform detector 120 detects a waveform 10 of an irregularly distorted current when an arc is generated by insulation breakdown. In case of arc generation by insulation breakdown, noise component is included in the power supply voltage, and the distorted part appears repeatedly in one cycle in the load current waveform. Accordingly, the arc is screened out using the noise component of the power supply voltage and the distorted portion of the load current waveform.

As illustrated in FIG. 5, the current waveform detector 120 detects a current waveform 20 in which distortion occurs by a phase control element such as a silicon control rectifier (SCR) or a triac (triac) of a dimmer. These waveforms are the same waveforms as when an arc occurs in the electric wire, which changes according to the change of the firing angle controlled by the home appliance control.

Accordingly, in the present invention, the waveform of the unspecified distortion current, that is, the arc current waveform, is detected based on the characteristics of the load current waveform shown in FIG. 6 and the waveform according to the change of the firing angle shown in FIG. 7.

As illustrated in FIG. 6, the current waveform detector 120 detects a load current waveform of the dimmer. The detected waveforms have distortion at regular intervals, such as a to A, b to B, and c to C, and the control circuit unit 150 receives the distortion waveform from the current waveform detector 120 and then performs a predetermined period. The waveform having one is removed and only an unspecified distortion waveform is detected.

FIG. 7 is a waveform 30 showing the firing at the first 30 °, the second 80 °, and the last 110 ° after applying power to three dimmers 400Watt. It can be seen that the waveform. Therefore, the control circuit unit 150 receives only the waveform of the unspecified distortion current, that is, the arc current waveform.

Subsequently, the voltage waveform detection unit 130 uses the high frequency transformer to generate minute noise included in the power supply voltage due to the distorted waveform as shown in FIG. 8, that is, (a), (b), (c), and (d). And (e) detect a high frequency arc voltage waveform, and the control circuit unit 150 receives the high frequency arc voltage waveform detected from the voltage waveform detection unit 130, and then combines the received arc current waveform with an electric wire. Detects the arc caused by insulation breakdown and stores it in real time.

In addition, the control circuit unit 150 receives and stores general data such as real time voltage, current, power, power factor, amount of power, reactive power, and the like from the electric safety device 100.

According to the present invention, it is possible to easily check the detection data of the desired object from the PD and to process the planned inspection area in a short time, thereby increasing the efficiency of manpower saving and electrical safety inspection.

In the PD receiving method, data of various power sources can be transmitted by using a multi-channel method instead of a single channel.

Claims (6)

In electric safety inspection system using PDA, Leakage current detection unit 110 for detecting a minute leakage current of the low frequency component; Current waveform detection unit 120 for detecting the waveform of the current distorted when the arc generated due to insulation breakdown; High frequency that is distorted when the arc generated due to insulation breakdown A voltage waveform detection unit 130 for detecting an arc voltage waveform; and a ground resistance detection unit 140 for detecting ground resistance of home appliances in the home; and a leakage current detection unit 110 and a current waveform in the form of a printed circuit board. Receives, analyzes, calculates, and stores the data detected by the detector 120, the voltage waveform detector 130, and the ground resistance detector 140, and uniquely identifies the distribution panel in the home designated for transmission and reception with the PD200. A storage module 151 for storing an ID, an RF transmission / reception module 153 for transmitting and receiving with the PD 200, and a control module 152 for controlling the storage module 151 and the RF transmission / reception module 153. Control meeting 150; And a power cut-off unit 160 which cuts off the power according to detection data such as leakage current, overcurrent, arc, etc. generated over the entire power line received by the control circuit unit 150; Electrical safety device 100 comprising a; And A PD (200) which transmits / receives data with the electrical safety device (100), and stores the detection data received from the electrical safety device (100), and processes the detected detection data to output the stored detection data; Consisting of The electrical safety device 100, the temperature detection unit 170 for detecting a temperature occurring across the power line; Electrical safety inspection system using a PD, characterized in that it further comprises. delete delete The method of claim 1, The electrical safety device 100, A display unit 180 which outputs a current state of a power wire; Electrical safety inspection system using a PD, characterized in that it further comprises. delete The method of claim 1, The PD 200, Inspection software 220 to store the RF transmission and reception unit 210 and the transmission and reception with the electrical safety device 100 and the detection data received from the electrical safety device 100, and then output to the PD 200 (200) ); Electrical safety inspection system using a PD, comprising a.

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