WO2018087885A1 - Deterioration detection apparatus, deterioration detection system, deterioration detection method, and program - Google Patents

Abstract

A waveform generation unit (107) generates a waveform of an electric current measured by a current sensor (10). A frequency analysis unit (108) calculates the feature quantity of a harmonic component in the waveform of the current generated by the waveform generation unit (107). A device model storage unit (105) stores a pre-deterioration device model in which are associated the type of an electric device and a feature quantity of a harmonic component in the waveform of the current flowing in a principal breaker when the device is operated while connected to a socket prior to deterioration, and a post-deterioration device model in which are associated the type of the electric device and a feature quantity of a harmonic component in the waveform of the current flowing in the principal breaker when the device is operated while connected to a socket after deterioration. A display unit (111) displays, on the basis of the feature quantity calculated by the frequency analysis unit (108), the feature quantity in the pre-deterioration device model, and the feature quantity in the post-deterioration device model, information that indicates an electric device connected to a socket after deterioration.

Description

Deterioration detection apparatus, deterioration detection system, deterioration detection method, and program

The present invention relates to a deterioration detection device, a deterioration detection system, a deterioration detection method, and a program.

Currently, various techniques for detecting signs of occurrence of tracking phenomenon are known. The tracking phenomenon is a phenomenon in which dust accumulated in the gap between the plug and the outlet becomes wet and conducts, and a portion carbonized by the conduction is short-circuited and ignites. As such a technique, for example, Patent Document 1 discloses a wet deterioration detection device that detects wet deterioration before a plug or an outlet is carbonized.

The wet degradation detection device disclosed in Patent Document 1 counts when the absolute value of both the positive and negative peak values of the waveform having a frequency higher than the power supply frequency in the current waveform of the electric circuit is 300 mA or more. The wet deterioration detection device disclosed in Patent Document 1 determines that wet deterioration has occurred when the number of counts during the voltage half cycle is 20 times or more when the connection load is in a stopped / standby state. To do.

Japanese Patent No. 4921868

However, with the wet deterioration detection device disclosed in Patent Document 1, the wet deterioration cannot be detected unless the wet deterioration proceeds to the extent that a current of 300 mA or more flows. In other words, the wet deterioration detection device disclosed in Patent Document 1 cannot detect the sign that the tracking phenomenon occurs at an early stage, and cannot notify the user of the sign that the tracking phenomenon occurs at an early stage. . For this reason, a technique for informing the user of the deterioration of the outlet leading to the occurrence of the tracking phenomenon at an early stage is desired.

The present invention has been made in view of the above problems, and provides a deterioration detection device, a deterioration detection system, a deterioration detection method, and a program that notify a user of deterioration of an outlet leading to the occurrence of a tracking phenomenon at an early stage. With the goal.

In order to achieve the above object, the deterioration detection apparatus according to the present invention is:
Current measuring means for measuring the current flowing through the main breaker;
A waveform generating means for generating a waveform of the current measured by the current measuring means;
Feature quantity calculating means for calculating a feature quantity of a harmonic component in the waveform of the current generated by the waveform generating means;
A pre-degradation device model that associates the type of electrical equipment with the characteristic amount of the harmonic component in the waveform of the current that flows through the main breaker when operating while connected to the outlet before degradation, and the type of electrical equipment and after degradation A device model storage means for storing a post-degradation device model that correlates with a feature quantity of a harmonic component in a waveform of a current that flows through the main breaker when connected to an outlet of the device, and
Based on the feature amount calculated by the feature amount calculation unit, the feature amount in the pre-degradation device model, and the feature amount in the post-degradation device model, the electric device connected to the outlet after the deterioration is shown Display means for displaying information.

In the present invention, based on the feature amount obtained from the waveform of the current flowing through the main breaker, the feature amount in the pre-degradation device model, and the feature amount in the post-degradation device model, the electrical connected to the outlet after degradation Information indicating the device is displayed. Therefore, according to the present invention, it is possible to notify the user of the deterioration of the outlet leading to the occurrence of the tracking phenomenon at an early stage.

The block diagram of the degradation detection system which concerns on Embodiment 1 of this invention Functional configuration diagram of the deterioration detection apparatus according to the first embodiment of the present invention 1 is an equivalent circuit diagram of an indoor wiring circuit according to the first embodiment of the present invention. The figure which shows the relationship between the voltage between power supply lines, and the electric current which flows through a power supply line Diagram showing frequency characteristics of filter circuit Diagram showing the characteristics of the detected current when the basic equipment model is adopted The figure which shows the characteristic of the detection current at the time of adoption of the equipment model before deterioration The figure which shows the characteristic of the detection current at the time of equipment model adoption after degradation The flowchart which shows the deterioration detection process which the deterioration detection apparatus which concerns on Embodiment 1 of this invention performs. The flowchart which shows the apparatus model production | generation process shown in FIG. The block diagram of the deterioration detection system which concerns on Embodiment 2 of this invention Equivalent circuit diagram of indoor wiring circuit according to embodiment 2 of the present invention Functional configuration diagram of an electric device according to Embodiment 2 of the present invention Functional configuration diagram of a deterioration detection apparatus according to Embodiment 2 of the present invention Diagram for explaining the method of determining the frequency of the signal Diagram for explaining signal pattern The flowchart which shows the signal output process which the electric equipment which concerns on Embodiment 2 of this invention performs The flowchart which shows the deterioration detection process which the deterioration detection apparatus which concerns on Embodiment 2 of this invention performs. The flowchart which shows the frequency specific process shown in FIG. Functional configuration diagram of an electric apparatus according to Embodiment 3 of the present invention The flowchart which shows the deterioration detection process which the electric equipment which concerns on Embodiment 3 of this invention performs.

(Embodiment 1)
As shown in FIG. 1, the deterioration detection system 1000 according to Embodiment 1 of the present invention includes a current sensor 10, a voltage sensor 20, and a deterioration detection device 100. The deterioration detection system 1000 detects deterioration of the outlets 41 and 42 leading to the occurrence of the tracking phenomenon at an early stage. The deterioration detection system 1000 detects deterioration of the outlets 41 and 42 for supplying electric power from the main breaker 30 to the electrical equipment based on the current flowing through the main breaker 30. In addition, when the deterioration detection system 1000 detects the deteriorated outlets 41 and 42, the deterioration detection system 1000 notifies that the deteriorated outlets 41 and 42 exist and the electrical devices connected to the deteriorated outlets 41 and 42.

Electrical equipment includes, for example, air conditioners, televisions, lighting, refrigerators, IHCH (Induction Heating Cooking Heater), eco-cute, ventilation fans, ice machines, lighting, insecticidal equipment, showcases, dehumidifiers, humidifiers, heating equipment, electric pots, electronic Range, rice cooker, bath dryer, etc. In the present embodiment, a refrigerator 210 and an air conditioner 220 will be described as an example of an electrical device that is considered to be likely to generate a tracking phenomenon because the state where the plug is inserted into the outlet continues for a long period of time.

The deterioration detection device 100 is connected to the current sensor 10 and the voltage sensor 20 by, for example, a coaxial cable. In addition, the degradation detection apparatus 100 is connected to the cloud server 300 and the terminal apparatus 400 via the communication network 500. The deterioration detection device 100 may include the current sensor 10 and the voltage sensor 20.

The current sensor 10 transmits a voltage value representing an instantaneous value of the current flowing through the power line 31 to the deterioration detection device 100. The current sensor 10 includes, for example, a magnetic core (not shown) through which the power line 31 penetrates, a winding (not shown) wound around the magnetic core, and a shunt resistor (not shown) connected to both ends of the winding. And). The current sensor 10 transmits the voltage value across the shunt resistor to the deterioration detection device 100.

The voltage sensor 20 transmits a voltage value representing a voltage between the power line 31 and the power line 32 to the deterioration detection apparatus 100. The voltage sensor 20 includes, for example, a voltage transformer (not shown) that generates a voltage obtained by reducing the voltage between the power line 31 and the power line 32 to 1 / M.

The main breaker 30 is connected to the electrical equipment used in the home when the sum of the currents flowing to the electrical equipment used in the home (hereinafter referred to as “total current” as appropriate) exceeds a predetermined threshold. Stop supplying current. Accordingly, the total current flows through the main breaker 30. The power line 31 and the power line 32 supply power to the electrical equipment used in the house. Therefore, the total current flows through the power line 31 and the power line 32. The power line 31 is a power line to which an L (live) phase potential is applied. The power line 32 is a power line to which an N (neutral) phase potential is applied.

The outlet 41 supplies power to the refrigerator 210. The outlet 41 has an insertion port (not shown) provided with an electrode (not shown) connected to the power line 31 and an insertion port (not shown) provided with an electrode (not shown) connected to the power line 32. And). The refrigerator 210 is supplied with electric power from a power system (not shown) via a plug 211 inserted into the outlet 41. The refrigerator 210 and the plug 211 are connected by a cable (not shown). When the refrigerator 210 operates, a current flows inside the refrigerator 210 and a current also flows through the main breaker 30 (power lines 31 and 32).

The current flowing in the refrigerator 210 when the refrigerator 210 is operating includes a harmonic component peculiar to the refrigerator 210. Therefore, the current flowing through the main breaker 30 when the refrigerator 210 is operating basically includes harmonic components peculiar to the refrigerator 210. However, since the harmonic component of the current flowing through the main breaker 30 is affected by the impedance of the outlet 41 and the wiring (impedance of the power lines 31 and 32), the harmonic component of the current flowing inside the refrigerator 210 and Is different.

Here, if the dust accumulated in the contact portion between the outlet 41 and the plug 211 gets wet, there may be electrical connection between electrodes (not shown) provided in the plug 211. If such a state continues, carbonization of the outlet 41, the plug 211, dust and the like proceeds at the contact portion between the outlet 41 and the plug 211. As carbonization proceeds, a tracking phenomenon occurs in which the carbonized portion is short-circuited and ignites. The deterioration detection apparatus 100 detects the wet deterioration of the outlet 41 in order to detect as soon as possible a sign that such a tracking phenomenon occurs. The wet deterioration of the outlet 41 appears as a change in the impedance of the outlet 41. Therefore, when the deterioration detection apparatus 100 detects that the harmonic component of the current flowing through the main breaker 30 has changed due to the change in the impedance of the outlet 41 when the refrigerator 210 is operating, the outlet 41 has deteriorated. Is determined.

The outlet 42 supplies power to the air conditioner 220. The outlet 42 has an insertion port (not shown) provided with an electrode (not shown) connected to the power line 31 and an insertion port (not shown) provided with an electrode (not shown) connected to the power line 32. And). The air conditioner 220 is supplied with electric power from a power system (not shown) through a plug 221 inserted into the outlet 42. The air conditioner 220 and the plug 221 are connected by a cable (not shown). When the air conditioner 220 is operated, a current flows in the air conditioner 220, and a current also flows in the main breaker 30 (power lines 31, 32).

The wet deterioration of the outlet 42 appears as a change in the impedance of the outlet 42. Therefore, when the deterioration detection apparatus 100 detects that the harmonic component of the current flowing through the main breaker 30 has changed due to the impedance change of the outlet 42 when the air conditioner 220 is operating, the outlet 42 has deteriorated. Is determined.

The cloud server 300 is a server that provides resources in cloud computing. The cloud server 300 is connected to the deterioration detection device 100 and the terminal device 400 via the communication network 500. The cloud server 300 stores the basic device model (reference model) and the filter model (pre-degradation filter model, post-degradation filter model), and provides the basic device model and the filter model to the degradation detection apparatus 100.

The terminal device 400 is connected to the deterioration detection device 100 and the cloud server 300 via the communication network 500. The terminal device 400 functions as a user interface for the deterioration detection device 100. When the deterioration is detected by the deterioration detection device 100, the terminal device 400 notifies the outlets 41 and 42 that the outlets 41 and 42 have deteriorated and the electrical equipment connected to the deteriorated outlets 41 and 42 according to an instruction from the deterioration detection device 100. . The terminal device 400 is, for example, a personal computer, a smartphone, a mobile phone, a tablet terminal, or the like.

The communication network 500 is a network for devices connected to the communication network 500 to communicate with each other. The communication network 500 is, for example, a WAN (Wide Area 、 Network), which is the Internet.

Although not shown, the degradation detection apparatus 100 is, for example, a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), AD (Analog Digital) converter, flash memory, RTC (Real Time Clock). , Touch screen, NIC (Network Interface Card).

As shown in FIG. 2, the degradation detection apparatus 100 functionally includes a communication unit 101, a basic device model storage unit 102, a filter model storage unit 103, a device model generation unit 104, and a device model storage unit 105. An AD conversion unit 106, a waveform generation unit 107, a frequency analysis unit 108, an operation probability estimation unit 109, a deterioration detection unit 110, and a display unit 111. The function of the communication unit 101 is realized by, for example, cooperation between the CPU and the NIC. The functions of the basic device model storage unit 102, the filter model storage unit 103, and the device model storage unit 105 are realized by, for example, a flash memory function. The functions of the device model generation unit 104, the waveform generation unit 107, the frequency analysis unit 108, the operation probability estimation unit 109, and the deterioration detection unit 110 are realized by, for example, the cooperation of the CPU, the ROM, and the RAM. The function of the AD conversion unit 106 is realized by an AD converter, for example. The function of the display unit 111 is realized by, for example, cooperation between the CPU and the touch screen.

The communication unit 101 acquires a basic device model (basic device model data) and a filter model (filter model data) from the cloud server 300 via the communication network 500. The basic device model associates the type of the electric device with the characteristic amount of the harmonic component in the waveform of the current flowing through the main breaker 30 when operating directly connected to the main breaker 30. The type of electrical device is represented by a character string (for example, “refrigerator”, “air conditioner”, etc.) composed of alphabets, numbers, hiragana, katakana, kanji, and the like. Filter models (filter model data) are classified into pre-degradation filter models (pre-degradation filter model data) and post-degradation filter models (post-degradation filter model data). The pre-deterioration filter model indicates frequency characteristics in the pre-deterioration filter circuit. The pre-deterioration filter circuit is composed of an outlet before deterioration and wiring (power lines 31 and 32) connecting the main breaker 30 and the outlet 41 before deterioration. The post-degradation filter model indicates frequency characteristics in the post-degradation filter circuit. The post-deterioration filter circuit is configured by an outlet 41 after deterioration, and wiring (power lines 31, 32) connecting the main breaker 30 and the outlet 41 after deterioration. Further, the communication unit 101 transmits notification instruction information to the terminal device 400 via the communication network 500 when the deterioration is detected by the deterioration detection unit 110. The notification instruction information is information instructing to notify that the outlet has deteriorated and the electrical equipment connected to the deteriorated outlet.

The basic device model storage unit 102 stores the basic device model supplied from the communication unit 101. The filter model storage unit 103 stores the filter models (pre-degradation filter model and post-degradation filter model) supplied from the communication unit 101. Based on the basic device model stored in the basic device model storage unit 102 and the filter models (pre-degradation filter model and post-degradation filter model) stored in the filter model storage unit 103, the device model generation unit 104 Generate models (pre-degradation equipment model and post-degradation equipment model). The device model storage unit 105 stores the device models (pre-degradation device model and post-degradation device model) generated by the device model generation unit 104. The basic device model, the device model before deterioration, and the device model after deterioration are managed for each type of electric device.

The pre-degradation equipment model (pre-degradation model) is a model including the indoor wiring, the pre-deterioration outlet 41, and the electrical equipment. The pre-degradation device model (pre-degradation device model data) includes the type of the electric device and the harmonics of the waveform of the current flowing through the main breaker 30 when the electric device connected to the outlet 41 before deterioration is operating. This is data indicating the characteristics. The pre-degradation device model is, for example, time-series data for each frequency component (the phase and signal intensity for each frequency) obtained by decomposing a current waveform for one cycle into one or more frequency components by wavelet transform. Data showing correspondence). The post-degradation equipment model (post-degradation model) is a model including indoor wiring, a post-degradation outlet 41, and electrical equipment. The after-degradation equipment model (after-degradation equipment model data) includes the type of the electrical equipment and the harmonics of the waveform of the current flowing through the main breaker 30 when the electrical equipment connected to the outlet 41 after degradation is operating. This is data indicating the characteristics. The post-degradation device model is, for example, time-series data for each frequency component (phase and signal intensity for each frequency) obtained by decomposing a current waveform for one cycle into one or more frequency components by wavelet transform. Data showing correspondence).

The AD converter 106 changes the voltage value (for example, 0 V to 5 V) corresponding to the current value (for example, -10 A to 10 A) detected by the current sensor 10 from an analog value to a digital value. Further, the AD conversion unit 106 changes a voltage value (for example, 0 V to 5 V) corresponding to a voltage value (for example, −200 V to 200 V) detected by the voltage sensor 20 from an analog value to a digital value. The waveform generation unit 107 converts the voltage value (for example, 0V to 5V) supplied from the AD conversion unit 106 into a current value (for example, −10A to 10A), and the converted current value (for example, −10A to 10A) ) To generate a current waveform. Further, the waveform generation unit 107 converts the voltage value (for example, 0V to 5V) supplied from the AD conversion unit 106 into a voltage value (for example, −200V to 200V), and the converted voltage value (for example, −200V). To 200V) to generate a voltage waveform. The waveform generator 107 detects the zero cross in the voltage waveform, thereby specifying the phase in the current waveform or the voltage waveform, or the current waveform or voltage waveform for one period (for example, 50 Hz) starting from the zero cross. Can be generated.

FIG. 4 shows a voltage waveform for one cycle and a current waveform for one cycle. The graph 410 is a graph showing a voltage waveform for one cycle of the voltage between the power line 31 and the power line 32. A graph 420 is a graph showing a current waveform for one cycle of the current flowing through the power line 31.

The frequency analysis unit 108 analyzes the frequency component of the current waveform for one cycle generated by the waveform generation unit 107. For example, the frequency analysis unit 108 decomposes a current waveform for one cycle into one or more frequency components by wavelet transform, and shows time-series data for each frequency component (showing the correspondence between phase and signal intensity for each frequency) Data). The time-series data for each frequency component is data indicating the characteristics of the harmonics of the current waveform. Note that the frequency analysis unit 108 may decompose the current waveform for one period into one or more frequency components by discrete Fourier transform.

The operation probability estimation unit 109 is based on the time-series data for each frequency component supplied from the frequency analysis unit 108 and the device models (pre-degradation device model and post-degradation device model) stored in the device model storage unit 105. Thus, the operation probability (the operation probability before deterioration and the operation probability after deterioration) is estimated for each electric device. The pre-deterioration operation probability is a probability that an electrical device connected to the outlet 41 before deterioration is operating. The post-degradation operation probability is a probability that the electric device connected to the post-deterioration outlet 41 is operating.

For example, the operation probability estimation unit 109 selects one electric device from among the electric devices whose device models are stored in the device model storage unit 105. Then, the operation probability estimation unit 109 acquires the pre-degradation device model and the post-degradation device model corresponding to the selected electrical device from the device model storage unit 105. The operation probability estimation unit 109 calculates the pre-deterioration operation probability based on the similarity between the characteristics of the harmonic components indicated by the time-series data for each frequency component and the characteristics of the harmonic components indicated by the pre-deterioration equipment model. Ask. In addition, the operation probability estimation unit 109 operates based on the similarity between the characteristics of the harmonic components indicated by the time-series data for each frequency component and the characteristics of the harmonic components indicated by the deteriorated device model. Find the probability.

The operation probability estimation unit 109 estimates, for example, a correlation coefficient between time series data at a specific frequency as an operation probability. For example, when the correlation coefficient is −1 to 0, the operation probability is 0%, and when the correlation coefficient exceeds 0, the correlation coefficient is multiplied by 100 to represent the operation probability as%. The specific frequency may be different or may be the same in the case of obtaining the pre-degradation operation probability and the case of obtaining the post-degradation operation probability. For example, when the operation probability before deterioration is obtained, the specific frequency may be 0.4 MHz, and when the operation probability after deterioration is obtained, the specific frequency may be 1 MHz. Alternatively, for example, the specific frequency may be 0.4 MHz in both cases of obtaining the pre-degradation operation probability and obtaining the post-degradation operation probability. As described above, the characteristic amount of the harmonic component compared between the acquired current waveform, the pre-degradation device model, and the post-degradation device model can be the intensity for each phase at a predetermined frequency. However, the feature quantity of the harmonic component to be compared is not limited to this example.

For example, a relatively high intensity at a frequency = 0.4 MHz and a phase = 225 ° is a characteristic of the pre-degradation device model. In this case, for example, the ratio of the intensity of the acquired current waveform at frequency = 0.4 MHz and phase = 225 ° to the intensity at frequency = 0.4 MHz and phase = 225 ° of the pre-degradation device model is the operation probability before deterioration. It can be. Similarly, for example, a relatively high intensity at a frequency = 1 MHz and a phase = 135 ° is a characteristic of the post-degradation device model. In this case, for example, the ratio of the intensity at the frequency = 1 MHz and the phase = 135 ° of the acquired current waveform to the intensity at the frequency = 1 MHz and the phase = 135 ° of the post-degradation device model may be set as the post-degradation operation probability. it can.

Or, for example, the characteristic of the pre-degradation device model is that the intensity at the frequency = 0.4 MHz and the phase = 225 ° is the highest, and the intensity at the frequency = 0.4 MHz and the phase = 45 ° is the second highest. And In this case, for example, when the combination with the highest intensity (frequency and phase) matches the combination with the second highest intensity (frequency and phase) in the pre-degradation device model and the acquired current waveform, The operation probability is 100%. Also, for example, when only the combination (frequency and phase) having the highest intensity matches the pre-degradation device model and the acquired current waveform, the pre-degradation operation probability is set to 50%. Similarly to the pre-degradation operation probability, the post-degradation operation probability can be estimated according to the matching degree of the combination (frequency and phase) having relatively high strength.

Thus, the characteristic amount of the harmonic component compared between the acquired current waveform, the pre-degradation device model, and the post-degradation device model can be the intensity at the predetermined frequency and the predetermined phase. . Similarly, the operation probability estimation unit 109 obtains the pre-deterioration operation probability and the post-degradation operation probability for other electrical devices.

The deterioration detection unit 110 detects the deteriorated outlets 41 and 42 based on the operation probabilities (pre-deterioration operation probability and post-degradation operation probability) estimated by the operation probability estimation unit 109. For example, regarding an electrical device, when the pre-degradation operation probability and the post-degradation operation probability are 50% or more and the post-degradation operation probability is higher than the pre-degradation operation probability, the outlet 41 to which the electrical device is connected, 42 is determined to be deteriorated. On the other hand, for example, when the pre-deterioration operation probability and the post-deterioration operation probability are 50% or more for a certain electric device, and the post-deterioration operation probability is lower than the pre-deterioration operation probability, the outlet to which the electric device is connected. It is determined that 41 and 42 are not deteriorated. Further, for example, when an operation probability before deterioration and an operation probability after deterioration are less than 50% for a certain electric device, it is determined that the electric device is not operating. When the deterioration detection unit 110 determines that there are deteriorated outlets 41 and 42, the deterioration detection unit 110 transmits notification instruction information to the communication unit 101 and the display unit 111.

Note that the deterioration detection unit 110 can be expected to reduce false detections by considering not only the post-deterioration operation probability but also the pre-deterioration operation probability. For example, the post-degradation device model related to the refrigerator 210 may be similar to the pre-degradation device model related to the air conditioner 220. In this case, even if neither the outlet 41 nor the outlet 42 has deteriorated, the operation probability after deterioration relating to the refrigerator 210 becomes very high. For this reason, if the deterioration is detected only by the operation probability after deterioration, it is determined that the outlet 41 is deteriorated. On the other hand, considering not only the post-deterioration operation probability but also the pre-deterioration operation probability, the pre-deterioration operation probability related to the refrigerator 210 is low, and therefore, it is not determined that the outlet 41 is deteriorated.

As described above, in the present embodiment, first, it is determined whether or not an electrical device is operating by determining whether or not the pre-deterioration operation probability and the pre-deterioration operation probability are equal to or greater than the threshold value, and then the pre-deterioration operation. By comparing the magnitude relationship between the probability and the pre-deterioration operation probability, it is determined whether or not the outlet to which the electrical device is connected has deteriorated. In this embodiment, when a certain electrical device is operating, both the pre-degradation operation probability of this electrical device and the post-degradation operation probability of this electrical device are the pre-degradation operation probability of other electrical devices and other The fact that the probability of operation after deterioration of electrical equipment is likely to be significantly higher is utilized.

It should be noted that the deterioration detection unit 110 may determine whether or not the outlet 41 has deteriorated without being based on the pre-deterioration operation probability and the pre-deterioration operation probability. For example, in the deterioration detection unit 110, the outlet 41 deteriorates based on the feature amount in the current waveform generated by the waveform generation unit 107, the feature amount in the pre-degradation device model, and the feature amount in the post-degradation device model. It may be determined whether or not. For example, the deterioration detection unit 110 approximates the feature amount in the generated current waveform to the feature amount in the pre-degradation device model and the feature amount in the post-degradation device model, and the feature amount in the generated current waveform and the post-degradation feature If the degree of approximation with the feature amount in the device model is higher, it may be determined that the outlet 41 has deteriorated. For example, it is assumed that the feature amount is signal intensity at a specific frequency and a specific phase. In this case, for example, the deterioration detection unit 110 generates a difference between the signal strength in the generated current waveform and the signal strength in the pre-degradation device model (hereinafter referred to as “first difference”) that is equal to or less than a threshold value. If the difference between the signal strength in the current waveform and the signal strength in the post-degradation device model (hereinafter referred to as “second difference”) is less than or equal to the threshold value, and the second difference is smaller than the first difference, It is determined that 41 is deteriorated. The degree of approximation described above may not be a difference in signal strength, but a ratio of signal strength. Further, it is preferable that the difference or ratio of the signal intensity is calculated after normalizing the generated current waveform, the pre-degradation device model, and the post-degradation device model.

When the display unit 111 receives the notification instruction information from the deterioration detection unit 110, the display unit 111 notifies that there is a deteriorated outlet and the electrical equipment connected to the deteriorated outlet. That is, the display unit 111 displays a message indicating that there is a deteriorated outlet and information indicating an electrical device connected to the deteriorated outlet.

Next, an equivalent circuit of the indoor wiring circuit will be described with reference to FIG. Here, an indoor wiring circuit from the main breaker 30 to the refrigerator 210 will be described as an example. When the indoor wiring circuit is a harmonic current source (V / ZI) constituted by a series circuit of an internal impedance 212 (ZI) and a harmonic voltage source 213 (V), the indoor wiring circuit is as shown in FIG. Can be modeled as an equivalent circuit. That is, in the equivalent circuit of the indoor wiring circuit, the harmonic current source (V / ZI) is connected to the external system impedance 33 via the impedance 43 (Zc (t)) of the outlet 41 and the wiring impedance 34 (Zf). It is a circuit terminated with (Zs).

Here, it is assumed that V, ZI, Zf, and Zs are fixed values without deterioration over time. Zf is configured by connecting R (for example, 0.3 mΩ / m) and L (for example, 0.64 μH / m) in series. On the other hand, Zc (t) is assumed to change with age (wet deterioration). Zc (t) is configured by connecting R and C in parallel. For example, in a dry state (state before deterioration), R is infinite and C is about 100 pF. In a wet state (the state after deterioration), R is about 200 kΩ and C is about 20 pF to 30 pF.

In this case, Is (t), which is a current flowing from the refrigerator 210 to the outlet 41, is defined by Expression (1). Further, Ih (t), which is a current flowing from the outlet 41 to the main breaker 30, is defined by Expression (2). “//” indicates parallel impedance.
Is (t) = V / (ZI + Zc (t) // (Zf + Zs)) Expression (1)
Ih (t) = Is × Zc (t) / (Zc (t) + Zf + Zs) (2)

Here, the frequency characteristic of the filter circuit 44 is shown in FIG. A graph 510 is a graph showing the frequency characteristics of the filter circuit 44 before the outlet 41 is deteriorated. On the other hand, the graph 520 is a graph showing the frequency characteristics of the filter circuit 44 after the outlet 41 is deteriorated. As shown in FIG. 5, the filter circuit 44 has greatly different frequency characteristics before the outlet 41 is deteriorated and after the outlet 41 is deteriorated. For example, when focusing on the frequency of 1 MHz, the gain before deterioration is −52 dB, the gain after deterioration is −34 dB, and the gain after deterioration is 18 dB higher than the gain before deterioration (about 8 times). ).

Fig. 6 shows the basic equipment model. The basic device model is a current (Ih (t) or Is flowing through Zs in a circuit in which the filter circuit 44 is removed (a circuit in which Zf is 0Ω and Zc (t) is infinite) in the equivalent circuit shown in FIG. It is a model which shows the characteristic of the harmonic component of (t)).

Fig. 7 shows the pre-degradation equipment model. The pre-degradation device model is a model that shows the characteristics of the harmonic component of the current (Ih (t)) flowing through Zs when Zc (t) is the impedance before degradation in the equivalent circuit shown in FIG. The device model before deterioration is obtained by adding the frequency characteristics of the filter circuit 44 before deterioration to the basic device model. The pre-degradation device model has higher strength at 0.4 MHz and lower strength at other frequencies than the basic device model. This is because the peak of the graph 510 indicating the frequency characteristics of the filter circuit 44 before deterioration is about 0.4 MHz.

Hereinafter, a method of generating the pre-degradation device model shown in FIG. 7 from the basic device model shown in FIG. 6 based on the filter characteristics shown in FIG. 5 will be described. First, referring to FIG. 5, the gain peak in the filter characteristic before deterioration is about 0.4 MHz, and the gain peak in the filter characteristic after deterioration is about 1 MHz. Therefore, the description will be made with attention paid to 0.4 MHz and 1 MHz. In the pre-degradation filter characteristics, when the gain of 0 MHz (about −40 dB) is used as a reference, the gain of 0.4 MHz (about −33 dB) is about 7 dB plus, and the gain of 1 MHz (about −52 dB) is about 12 dB minus. is there. Therefore, in the basic equipment model shown in FIG. 6, the frequency component of 0.4 MHz is about 2.2 times (10 ^7/20 ), and the frequency component of 1 MHz is about 1/4 times (10 ^−12/20 ). This is the device model before deterioration shown in FIG. Similarly, other frequency components are increased or decreased according to the gain of the filter characteristics before deterioration.

Fig. 8 shows the equipment model after degradation. The post-degradation device model is a model that shows the characteristics of the harmonic component of the current (Ih (t)) flowing through Zs when Zc (t) is the impedance after degradation in the equivalent circuit shown in FIG. The post-degradation device model is obtained by adding the frequency characteristics of the post-degradation filter circuit 44 to the basic device model. The post-degradation device model has higher strength at 1.0 MHz and lower strength at other frequencies than the basic device model. This is because the peak of the graph 520 showing the frequency characteristics of the filter circuit 44 after deterioration is about 1.0 MHz.

Hereinafter, a method of generating the post-degradation device model shown in FIG. 8 from the basic device model shown in FIG. 6 based on the filter characteristics shown in FIG. 5 will be described. Here, the description will be given focusing on 0.4 MHz and 1 MHz. The filter characteristics after degradation are based on 0 MHz gain (about −40 dB), 0.4 MHz gain (about −39 dB) is about 1 dB plus, and 1 MHz gain (about −34 dB) is about 6 dB plus. is there. Therefore, in the basic equipment model shown in FIG. 6, the frequency component of 0.4 MHz is approximately 1.1 times (10 ^1/20 ) and the frequency component of 1 MHz is approximately double (10 ^6/20 ). A post-degradation device model shown in FIG. Similarly, other frequency components are increased or decreased in accordance with the gain of the filter characteristics after deterioration.

Next, the degradation detection process executed by the degradation detection apparatus 100 will be described with reference to FIG. The deterioration detection process is started, for example, in response to the power supply of the deterioration detection apparatus 100 being turned on. First, the deterioration detection apparatus 100 executes a device model generation process (step S101). The device model generation process will be described with reference to FIG.

In the device model generation process, first, the communication unit 101 acquires a basic device model for each electric device from the cloud server 300 (step S201). The communication unit 101 causes the basic device model storage unit 102 to store the acquired basic device model. When the process of step S201 is completed, the communication unit 101 acquires a pre-degradation filter model from the cloud server 300 (step S202). Note that the communication unit 101 stores the acquired pre-degradation filter model in the filter model storage unit 103. When the process of step S202 is completed, the communication unit 101 acquires a post-degradation filter model from the cloud server 300 (step S203). The communication unit 101 stores the acquired post-degradation filter model in the filter model storage unit 103.

When the processing in step S203 is completed, the device model generation unit 104 selects an electrical device (step S204). When the process of step S204 is completed, the device model generation unit 104 generates a pre-degradation device model for the selected electrical device (step S205). The device model generation unit 104 stores the generated pre-degradation device model in the device model storage unit 105. When the process of step S205 is completed, the device model generation unit 104 generates a post-degradation device model for the selected electrical device (step S206). The device model generation unit 104 stores the generated post-degradation device model in the device model storage unit 105.

When the processing in step S206 is completed, the device model generation unit 104 determines whether there is an unselected electric device (step S207). If it is determined that there is an unselected electrical device (step S207: YES), the device model generation unit 104 returns the process to step S204 and selects another electrical device. On the other hand, when the device model generation unit 104 determines that there is no unselected electric device (step S207: NO), the device model generation process is completed.

When the device model generation process is completed, the waveform generation unit 107 generates a current waveform (step S102). When the process of step S102 is completed, the frequency analysis unit 108 analyzes the frequency of the generated current waveform (step S103). For example, the frequency analysis unit 108 obtains time-series data for each frequency component by performing wavelet transform on the generated current waveform.

When the processing in step S103 is completed, the operation probability estimation unit 109 selects an electrical device (step S104). When the process of step S104 is completed, the motion probability estimation unit 109 calculates a feature amount (step S105). For example, the motion probability estimation unit 109 extracts 0.4 MHz time series data and 1 MHz time series data from the time series data for each frequency component.

When the processing in step S105 is completed, the operation probability estimation unit 109 estimates the operation probability of the pre-degradation device model (step S106). For example, the operation probability estimation unit 109 obtains a correlation coefficient between the extracted 0.4 MHz time series data and the 0.4 MHz time series data in the pre-degradation device model, and estimates the operation probability of the pre-degradation device model. To do. When the process of step S106 is completed, the operation probability estimation unit 109 estimates the operation probability of the deteriorated device model (step S107). For example, the operation probability estimation unit 109 obtains a correlation coefficient between the extracted 1 MHz time series data and the 1 MHz time series data in the deteriorated device model, and estimates the operation probability of the deteriorated device model.

When the processing in step S107 is completed, the deterioration detection unit 110 determines whether or not the outlet has deteriorated (step S108). For example, in the deterioration detection unit 110, the operation probability of the device model before deterioration and the operation probability of the device model after deterioration are 50% or more, and the operation probability of the device model after deterioration is more than the operation probability of the device model before deterioration. When it is high, it is determined that the outlet to which the selected electrical device is connected has deteriorated.

When the deterioration detecting unit 110 determines that the outlet is deteriorated (step S108: YES), the display unit 111 displays that the outlet is deteriorated (step S109). The display unit 111 displays information indicating an electrical device connected to the deteriorated outlet in addition to a message indicating that the outlet is deteriorated. When the deterioration detection unit 110 determines that the outlet has not deteriorated (step S108: NO), or when the process of step S109 is completed, the operation probability estimation unit 109 determines whether there is an unselected electrical device. Is determined (step S110).

If the operation probability estimation unit 109 determines that there is an unselected electrical device (step S110: YES), the process returns to step S104 to select an unselected electrical device. On the other hand, when it is determined that there is no unselected electrical device (step S110: NO), the operation probability estimation unit 109 waits for a predetermined time (step S111). The predetermined time is, for example, one day. When the operation probability estimation unit 109 completes the process of step S111, the operation probability estimation unit 109 returns the process to step S102.

In the present embodiment, the connection is made to the outlet 41 after deterioration based on the feature amount obtained from the waveform of the current flowing through the main breaker 30, the feature amount in the pre-degradation device model, and the feature amount in the post-degradation device model. Information indicating the selected electrical device is displayed. Therefore, according to the present embodiment, it is possible to detect the deterioration of the outlet leading to the occurrence of the tracking phenomenon at an early stage and notify the user at an early stage.

In addition, the wet deterioration detection device described in Patent Document 1 described above needs to be provided for each electric device. However, the deterioration detection apparatus 100 according to the present embodiment does not have to be provided for each electric device, and detects which outlet connected to which electric device has deteriorated by monitoring the current flowing through the main breaker 30. Can do. In the present embodiment, the electrical device may not have a special function.

In the present embodiment, a pre-degradation device model is generated based on the basic device model and the frequency characteristic in the pre-deterioration filter circuit, and the post-degradation device model is generated based on the basic device model and the frequency characteristic in the post-degradation filter circuit. Generated. In other words, in the present embodiment, models (basic device model, pre-degradation filter model, post-degradation filter model) that are considered to be easily obtained are not easily modeled (pre-degradation device model, post-degradation device model). Generated. For this reason, according to this embodiment, it is not necessary to obtain in advance a huge amount of models (pre-degradation device model, post-degradation device model) that are considered difficult to obtain.

That is, since the basic device model is basically a model corresponding to the type of electric device, it may be prepared for each type of electric device. The basic device model may also be provided by the manufacturer of the electrical device. The pre-degradation filter model and the post-degradation filter model are models corresponding to the type of outlet and the wiring length from the outlet to the main breaker 30, for example. If the frequency characteristics do not change so much depending on the type of outlet, a pre-degradation filter model and a post-degradation filter model may be prepared for each wiring length. That is, when generating the pre-degradation device model and the post-degradation device model from the basic device model, the pre-degradation filter model, and the post-degradation filter model, it is not necessary to prepare much information. On the other hand, if an attempt is made to prepare a pre-degradation device model and a post-degradation device model in advance, it is necessary to prepare a combination of the type of electrical device and the wiring length, which would require a great deal of effort and a large storage capacity.

In the present embodiment, the outlet is deteriorated when the pre-deterioration operation probability and the post-deterioration operation probability are equal to or higher than a predetermined threshold, and the post-deterioration operation probability is higher than the pre-deterioration operation probability. The effect is notified. That is, in this embodiment, first, it is determined whether or not any electrical device is operating based on the heights of both the pre-degradation operation probability and the post-degradation operation probability, and then, the pre-degradation operation probability and It is determined whether or not the outlet connected to the electrical device determined to be operating is deteriorated based on the magnitude relationship with the post-deterioration operation probability. Therefore, according to the present embodiment, it is possible to reduce erroneous detection of outlet deterioration.

(Embodiment 2)
In the first embodiment, the example in which the degradation detection apparatus 100 detects a degraded outlet based on the pre-degradation device model and the post-degradation device model has been described. In the present embodiment, an example will be described in which the deterioration detection device 120 detects a deteriorated outlet without being based on the pre-deterioration device model and the post-degradation device model. In the present embodiment, the electrical device connected to the electrical outlet is provided with a function of outputting a signal having a pattern unique to the electrical device so that the degradation detection device 120 can easily detect the degraded electrical outlet. In the present embodiment, when the deterioration detection device 120 detects that the level of the signal of the pattern unique to the electric device has increased due to the deterioration of the outlet, it determines that the outlet connected to the electric device has deteriorated. To do. In the second embodiment, the description of the same parts as those in the first embodiment is omitted or simplified.

As shown in FIG. 11, the deterioration detection system 1100 according to the second embodiment includes electrical devices (a refrigerator 214 and an air conditioner 224) in addition to the current sensor 10, the voltage sensor 20, and the deterioration detection device 120. The refrigerator 214 includes a harmonic current source 215 and a voltage measuring device 216. The air conditioner 224 includes a harmonic current source 225 and a voltage measuring device 226. The harmonic current source 215 basically has the same function as the harmonic current source 225. The voltage measuring device 216 basically has the same function as the voltage measuring device 226. Hereinafter, the harmonic current source 215 and the voltage measuring device 216 will be described using the refrigerator 214 as an example.

As shown in FIG. 12, the harmonic current source 215 is a current source provided to flow a current having harmonics unique to the refrigerator 214. The harmonic current source 215 includes an internal impedance 217 and a harmonic voltage source 218. The internal impedance 217 corresponds to the internal impedance 212, and the harmonic voltage source 218 corresponds to the harmonic voltage source 213. That is, the harmonic current source 215 is a current source for allowing a current having a specific harmonic to flow instead of a load circuit (not shown) provided in the refrigerator 214. In the present embodiment, the load circuit (not shown) included in the refrigerator 214 does not pass a current having a specific harmonic and can be ignored with respect to detection of the harmonic.

The voltage measuring device 216 measures the voltage generated by the harmonic voltage source 213 across the impedance 43. The function of the voltage measuring device 216 is basically the same as the function of the voltage sensor 20. Note that the voltage generated by the harmonic voltage source 213 across the impedance 43 depends on the frequency characteristics of the filter circuit 44. Therefore, even if the harmonic voltage source 213 outputs the same voltage, if the frequency characteristic of the filter circuit 44 is changed, the voltage generated across the impedance 43 is changed.

Although not shown, the refrigerator 214 includes, for example, a CPU, ROM, RAM, AD converter, flash memory, RTC, touch screen, and NIC in addition to the harmonic current source 215 and the voltage measuring device 216.

As shown in FIG. 13, the refrigerator 214 functionally includes a pattern storage unit 201, a control unit 202, a signal generation unit 203, a voltage measurement unit 204, a frequency characteristic registration unit 205, and a frequency characteristic storage unit. 206 and a frequency determination unit 207. The functions of the pattern storage unit 201 and the frequency characteristic storage unit 206 are realized by, for example, a flash memory function. The functions of the control unit 202, the frequency characteristic registration unit 205, and the frequency determination unit 207 are realized by, for example, the cooperation of the CPU, the ROM, and the RAM. The function of the signal generation unit 203 is realized by the function of the harmonic current source 215, for example. The function of the voltage measuring unit 204 is realized by the function of the voltage measuring device 216, for example.

The pattern storage unit 201 stores a signal pattern unique to the refrigerator 214. An example of the signal pattern is shown in FIG. The signal pattern shown in FIG. 16 is a pattern in which a harmonic signal of about ± 1 V (for example, about 0.8 MHz) is output three times with a period of 0.2 seconds. The frequency of the harmonic signal is determined in consideration of the frequency characteristics of the filter circuit 44. For example, the signal is output at intervals of about 1 to 10 minutes.

The control unit 202 executes various controls. For example, the control unit 202 controls signal generation by the signal generation unit 203. In addition, the control unit 202 instructs the signal generation unit 203 on the frequency of the generated signal. When acquiring the frequency characteristics, the control unit 202 causes the signal generation unit 203 to output a signal while gradually increasing or decreasing the frequency. For example, the control unit 202 changes the frequency in the range of 0.2 MHz to 2 MHz. The signal generation unit 203 generates a signal having a frequency specified by the control unit 202 according to control by the control unit 202. The voltage measurement unit 204 measures the voltage of the signal generated by the signal generation unit 203.

The frequency characteristic registration unit 205 identifies the frequency characteristic by associating the relationship between the frequency of the output signal and the voltage measured by the voltage measurement unit 204. The frequency characteristic registration unit 205 causes the frequency characteristic storage unit 206 to store the specified frequency characteristic. The frequency characteristic storage unit 206 stores the frequency characteristic specified by the frequency characteristic registration unit 205.

The frequency determination unit 207 determines the frequency of the signal to be generated by the signal generation unit 203 based on the frequency characteristic stored in the frequency characteristic storage unit 206. For example, it is assumed that the frequency characteristic indicated by the graph 510 in FIG. 15 is stored as the frequency characteristic before deterioration. In this case, when the outlet 41 is deteriorated, the frequency characteristic of the filter circuit 44 is considered to change like the frequency characteristic indicated by the graph 520 in FIG. That is, it is considered that the frequency at which the gain reaches a peak increases due to deterioration of the outlet 41. Therefore, a frequency higher than the peak frequency in the frequency characteristic before deterioration is determined as the frequency of the signal generated by the signal generation unit 203. Accordingly, it is possible to detect that the outlet 41 has deteriorated by detecting an increase in the level of the signal generated by the signal generator 203.

For example, in the example shown in FIG. 15, the peak frequency before deterioration is 0.44 MHz. In this case, for example, a frequency ranging from 0.66 MHz which is 1.5 times 0.44 MHz to about 1.11 MHz which is 2.5 times 0.44 MHz is determined as the signal frequency. For example, 0.88 MHz which is twice 0.44 MHz is determined as the signal frequency.

Although not shown, the deterioration detection device 120 includes, for example, a CPU, ROM, RAM, AD converter, flash memory, RTC, touch screen, and NIC. As illustrated in FIG. 14, the deterioration detection device 120 functionally includes a communication unit 101, an AD conversion unit 106, a waveform generation unit 107, a frequency analysis unit 108, a deterioration detection unit 110, and a display unit 111. A frequency identification unit 113, a device information storage unit 114, a pattern detection unit 115, and a level detection unit 116.

The function of the communication unit 101 is realized by, for example, cooperation between the CPU and the NIC. The function of the AD conversion unit 106 is realized by an AD converter, for example. The functions of the waveform generation unit 107, the frequency analysis unit 108, the deterioration detection unit 110, the frequency specification unit 113, the pattern detection unit 115, and the level detection unit 116 are realized, for example, by the cooperation of the CPU, ROM, and RAM. . The function of the display unit 111 is realized by, for example, cooperation between the CPU and the touch screen. The function of the device information storage unit 114 is realized by a function of a flash memory, for example.

The communication unit 101 acquires device information from the cloud server 300 via the communication network 500. The device information is information that associates the type of electric device with a signal pattern. In addition, when the communication unit 101 receives the notification instruction information from the deterioration detection unit 110, the communication unit 101 transmits the notification instruction information to the terminal device 400 via the communication network 500. The AD conversion unit 106 converts the voltage value supplied from the current sensor 10 and the voltage value supplied from the voltage sensor 20 from an analog value to a digital value. The waveform generation unit 107 converts and connects the voltage values supplied from the AD conversion unit 106 to generate a current waveform and a voltage waveform.

The frequency analysis unit 108 performs frequency analysis on the current waveform generated by the waveform generation unit 107. For example, the frequency analysis unit 108 performs wavelet transform or discrete Fourier transform on the current waveform in order to specify a frequency with high signal strength. The deterioration detection unit 110 determines whether or not the outlet is deteriorated based on the signal level detected by the level detection unit 116 and the device information stored in the device information storage unit 114. In the device information, in addition to the type of electric device and the signal pattern, the signal frequency and the initial signal level are associated with each other. Therefore, when the signal level detected by the level detection unit 116 is higher than the initial level of the signal indicated by the device information, the deterioration detection unit 110 determines that the outlet is deteriorated. When detecting deterioration of the outlet, the deterioration detecting unit 110 transmits notification instruction information to the communication unit 101 and the display unit 111. When receiving the notification instruction information from the deterioration detection unit 110, the display unit 111 displays a message indicating that the outlet has deteriorated and information indicating the electrical device connected to the deteriorated outlet.

The frequency specifying unit 113 specifies the frequency of the signal based on the result of the frequency analysis by the frequency analyzing unit 108. The device information storage unit 114 stores device information acquired from the communication unit 101. The frequency specified by the pattern detection unit 115 and the signal level detected by the level detection unit 116 are added to the device information stored in the device information storage unit 114. The pattern detection unit 115 is based on the result of the frequency analysis performed by the frequency analysis unit 108, the frequency specified by the frequency specifying unit 113, and the signal pattern included in the device information stored in the device information storage unit 114. Detect the signal level. The pattern detection unit 115 adds the frequency of the detected signal pattern to the device information having this signal pattern.

The level detection unit 116 detects the signal level of the signal detected by the pattern detection unit 115. When the signal level of the new signal pattern is detected, the level detection unit 116 adds the detected signal level as the initial signal level to the device information including the detected signal.

Next, a signal output process executed by the refrigerator 214 will be described with reference to FIG. The signal output process is started in response to, for example, turning on the refrigerator 214. First, the control unit 202 selects a frequency (step S301). The control unit 202 initially selects 0.2 MHz, gradually increases the frequency to be selected, and finally selects 2.0 MHz. That is, the selectable frequency is between 0.2 MHz and 2.0 MHz, and is higher than the selected frequency.

When the process of step S301 is completed, the control unit 202 outputs a signal at the selected frequency (step S302). The control unit 202 controls the signal generation unit 203 to output a signal at the selected frequency. When the process of step S302 is completed, the voltage measurement unit 204 measures the voltage (step S303). When the process of step S303 is completed, the frequency characteristic registration unit 205 stores the correspondence relationship between the frequency and the voltage in the frequency characteristic storage unit 206 as a frequency characteristic (step S304).

When the process of step S304 is completed, the control unit 202 determines whether there is an unselected frequency (step S305). When determining that there is an unselected frequency (step S305: YES), the control unit 202 returns the process to step S301 and selects a frequency slightly higher than the selected frequency. On the other hand, when the control unit 202 determines that there is no unselected frequency (step S305: NO), the frequency determination unit 207 determines the frequency of the signal to be output (step S306). Note that the absence of an unselected frequency means that the acquisition of frequency characteristics has been completed. Therefore, the frequency determination unit 207 refers to the acquired frequency characteristic and determines a frequency that is about twice the gain peak as the frequency of the output signal.

When the process of step S306 is completed, the control unit 202 outputs a predetermined pattern signal at the determined frequency (step S307). When the process of step S307 is completed, the control unit 202 waits for a predetermined time (for example, 1 minute) (step S308). When the process of step S308 is completed, the control unit 202 returns the process to step S307. As described above, in the signal output process, the frequency characteristics are acquired, the frequency of the signal is determined based on the acquired frequency characteristics, and thereafter, a signal having a predetermined pattern is output periodically at the determined frequency. Is done.

Next, the deterioration detection process executed by the deterioration detection device 120 will be described with reference to FIG. The deterioration detection process is started, for example, in response to the power supply of the deterioration detection device 120 being turned on. First, the deterioration detection apparatus 120 performs a frequency specifying process (step S401). The frequency specifying process will be described in detail with reference to FIG.

In the frequency specifying process, first, the waveform generation unit 107 generates a current waveform (step S501). When the process of step S501 is completed, the frequency analysis unit 108 performs frequency analysis on the generated current waveform (step S502). When the process of step S502 is completed, the frequency specifying unit 113 specifies a frequency having an intensity equal to or higher than the threshold (step S503). When the process of step S503 is completed, the pattern detection unit 115 selects a frequency from the identified frequencies (step S504). When the process of step S504 is completed, the pattern detection unit 115 detects a signal pattern at the selected frequency (step S505).

The level detection unit 116 specifies the level of the signal pattern when the process of step S505 is completed (step S506). When the process of step S506 is completed, the pattern detection unit 115 and the level detection unit 116 add the selected frequency and the detected signal level to the device information (step S507). When the process of step S507 is completed, the pattern detection unit 115 determines whether there is an unselected frequency among the specified frequencies (step S508). When determining that there is an unselected frequency (step S508: YES), the pattern detection unit 115 returns the process to step S504 and selects an unselected frequency. On the other hand, when determining that there is no unselected frequency (step S508: NO), the pattern detection unit 115 completes the frequency specifying process.

The waveform generation unit 107 generates a current waveform when the frequency specifying process is completed (step S402). When the processing in step S402 is completed, the frequency analysis unit 108 performs frequency analysis on the generated current waveform (step S403). When the process of step S403 is completed, the pattern detection unit 115 selects an electrical device (step S404). Note that selecting an electric device means selecting a frequency of a signal output from the electric device. When the process of step S404 is completed, the pattern detection unit 115 detects a signal pattern at the selected frequency (step S405). When the process of step S405 is completed, the level detection unit 116 specifies the level of the signal pattern (step S406).

When the process of step S406 is completed, the deterioration detection unit 110 determines whether or not the outlet connected to the selected electrical device has deteriorated (step S407). For example, the deterioration detection unit 110 determines that the outlet is deteriorated when the detected signal level is five times the initial signal level indicated by the device information.

When the deterioration detection unit 110 determines that the outlet is deteriorated (step S407: YES), the display unit 111 displays that the outlet is deteriorated (step S408). The display unit 111 displays information indicating an electrical device connected to the deteriorated outlet in addition to a message indicating that the outlet is deteriorated. When the deterioration detection unit 110 determines that the outlet has not deteriorated (step S407: NO), or when the process of step S408 is completed, the pattern detection unit 115 determines whether there is an unselected electrical device. Is discriminated (step S409).

If the pattern detection unit 115 determines that there is an unselected electrical device (step S409: YES), the pattern detection unit 115 returns the process to step S404 and selects an unselected electrical device. On the other hand, when determining that there is no unselected electrical device (step S409: NO), the pattern detection unit 115 waits for a predetermined time (step S410). The predetermined time is, for example, one day. When completing the process of step S410, the pattern detection unit 115 returns the process to step S402.

In the present embodiment, information indicating the electrical equipment connected to the deteriorated outlet 41 is displayed based on the signal level detected from the current waveform of the current flowing through the main breaker 30 and the initial signal level. . Therefore, according to the present embodiment, it is possible to detect the deterioration of the outlet leading to the occurrence of the tracking phenomenon at an early stage and notify the user at an early stage. Further, the deterioration detection device 120 according to the present embodiment does not need to be provided for each electric device, and detects which outlet connected to the electric device has deteriorated by monitoring the current flowing through the main breaker 30. Can do.

(Embodiment 3)
In the second embodiment, the example in which the deterioration detecting device 120 detects the deteriorated outlet 41 by detecting the change in the signal level accompanying the change in the frequency characteristic of the filter circuit 44 has been described. In the present embodiment, an example will be described in which the electrical device itself detects a deteriorated outlet by detecting a change in signal level accompanying a change in frequency characteristics of the filter circuit 44. Note that the electrical device according to the present embodiment can also be considered as the deterioration detection device 120 built in the electrical device. In the present embodiment, the description overlapping with the second embodiment is omitted or simplified.

Although not shown, the refrigerator 230 according to the present embodiment includes, for example, a CPU, ROM, RAM, AD converter, flash memory, RTC, touch screen, and NIC in addition to the harmonic current source 215 and the voltage measuring device 216. .

As shown in FIG. 20, the refrigerator 230 functionally includes a control unit 202, a signal generation unit 203, a voltage measurement unit 204, a frequency characteristic registration unit 205, a frequency characteristic storage unit 206, and a deterioration detection unit. 208 and a display unit 209. The functions of the control unit 202, the frequency characteristic registration unit 205, and the deterioration detection unit 208 are realized by, for example, the cooperation of the CPU, the ROM, and the RAM. The function of the signal generation unit 203 is realized by the function of the harmonic current source 215, for example. The function of the voltage measuring unit 204 is realized by the function of the voltage measuring device 216, for example. The function of the frequency characteristic storage unit 206 is realized by the function of a flash memory, for example. The function of the display unit 209 is realized by, for example, cooperation between the CPU and the touch screen.

The control unit 202 executes various controls. For example, the control unit 202 controls signal generation by the signal generation unit 203. In addition, the control unit 202 instructs the signal generation unit 203 on the frequency of the generated signal. When acquiring the frequency characteristics, the control unit 202 causes the signal generation unit 203 to output a signal while gradually increasing or decreasing the frequency. For example, the control unit 202 changes the frequency in the range of 0.2 MHz to 2 MHz. The signal generation unit 203 generates a signal having a frequency specified by the control unit 202 according to control by the control unit 202. The voltage measurement unit 204 measures the voltage of the signal generated by the signal generation unit 203. The control part 202 performs the process which acquires a frequency characteristic regularly (for example, every day).

The frequency characteristic registration unit 205 identifies the frequency characteristic by associating the relationship between the frequency of the output signal and the voltage measured by the voltage measurement unit 204. The frequency characteristic registration unit 205 causes the frequency characteristic storage unit 206 to store the specified frequency characteristic. The frequency characteristic storage unit 206 stores the frequency characteristic specified by the frequency characteristic registration unit 205.

The deterioration detection unit 208 detects the deterioration of the outlet based on the frequency characteristic history stored in the frequency characteristic storage unit 206. For example, the deterioration detection unit 208 determines that the outlet has deteriorated when the peak frequency in the newly acquired frequency characteristic is higher than about 1.5 times the peak frequency in the frequency characteristic acquired before the outlet deteriorates. Determine. The deterioration detection unit 208 transmits notification instruction information to the display unit 209 when detecting deterioration of the outlet. On the other hand, when receiving the notification instruction information, the display unit 209 displays a message indicating that the outlet has deteriorated.

Next, the deterioration detection process performed by the refrigerator 230 will be described with reference to FIG. The deterioration detection process is started in response to, for example, turning on the refrigerator 230. First, the control unit 202 selects a frequency (step S601). The control unit 202 initially selects 0.2 MHz, gradually increases the frequency to be selected, and finally selects 2.0 MHz. That is, the selectable frequency is between 0.2 MHz and 2.0 MHz, and is higher than the selected frequency.

When the process of step S601 is completed, the control unit 202 outputs a signal at the selected frequency (step S602). The control unit 202 controls the signal generation unit 203 to output a signal at the selected frequency. When the process of step S602 is completed, the voltage measurement unit 204 measures the voltage (step S603). When the process of step S603 is completed, the frequency characteristic registration unit 205 stores the correspondence relationship between the frequency and the voltage in the frequency characteristic storage unit 206 as a frequency characteristic (step S604).

When the process in step S604 is completed, the control unit 202 determines whether there is an unselected frequency (step S605). When determining that there is an unselected frequency (step S605: YES), the control unit 202 returns the process to step S601 and selects a frequency slightly higher than the selected frequency. On the other hand, when the control unit 202 determines that there is no unselected frequency (step S605: NO), the frequency characteristic registration unit 205 stores the frequency characteristic in the frequency characteristic storage unit 206 (step S606).

The deterioration detection unit 208 determines whether or not there is a change in the frequency characteristics when the process of step S606 is completed (step S607). When determining that there is no change in the frequency characteristics (step S607: NO), the deterioration detection unit 208 waits for a predetermined time (for example, one day) (step S608), and returns the process to step S601. On the other hand, when the deterioration detection unit 208 determines that there is a change in the frequency characteristics (step S607: YES), the display unit 209 notifies that the outlet has deteriorated (step S609). When the process of step S609 is completed, the deterioration detection process is completed.

In the present embodiment, when the oscillation frequency (peak frequency) at which the level of the high-frequency signal output from the electrical equipment reaches a peak is increased by a predetermined threshold or more (for example, the detected peak frequency is the peak detected initially). When the frequency increases to 5 times or more, in this case, the threshold is 4 times the peak frequency detected at the beginning. Therefore, according to the present embodiment, it is possible to detect the deterioration of the outlet leading to the occurrence of the tracking phenomenon at an early stage and notify the user at an early stage.

(Modification)
As mentioned above, although embodiment of this invention was described, when implementing this invention, a deformation | transformation and application with a various form are possible.

In the present invention, which part of the configuration, function, and operation described in the above embodiment is adopted is arbitrary. Further, in the present invention, in addition to the configuration, function, and operation described above, further configuration, function, and operation may be employed. Moreover, the structure, function, and operation | movement demonstrated in the said embodiment can be combined freely.

For example, which function of the degradation detection device 100, the cloud server 300, and the terminal device 400 is given can be appropriately adjusted. That is, the functional configuration included in the degradation detection system 1000 may be included in any of the degradation detection device 100, the cloud server 300, and the terminal device 400.

In the first embodiment, an example in which many of the functions of the degradation detection device 100 are realized by software (or firmware), that is, many of the functions of the degradation detection device 100 are realized by execution of a program by a processor. Explained. In the present invention, such a function may be realized by hardware. In this case, for example, the deterioration detection apparatus 100 includes a processing circuit instead of the CPU. This processing circuit is configured by, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.

It is also possible to cause the personal computer to function as the deterioration detection device 100 according to the present invention by applying an operation program that defines the operation of the deterioration detection device 100 according to the present invention to an existing personal computer or information terminal device. . The distribution method of such a program is arbitrary. For example, the program is stored and distributed on a computer-readable recording medium such as a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), or a memory card. Alternatively, it may be distributed via a communication network (for example, the Internet).

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

The present invention is applicable to a deterioration detection system that detects deterioration of an outlet leading to occurrence of a tracking phenomenon at an early stage.

10 current sensor, 20 voltage sensor, 30 trunk breaker, 31, 32 power line, 33 external system impedance, 34 wiring impedance, 41, 42 outlet, 43 impedance, 44 filter circuit, 100, 120 deterioration detection device, 101 communication unit, 102 Basic device model storage unit, 103 filter model storage unit, 104 device model generation unit, 105 device model storage unit, 106 AD conversion unit, 107 waveform generation unit, 108 frequency analysis unit, 109 operation probability estimation unit, 110 deterioration detection unit, 111 Display unit, 113 Frequency identification unit, 114 Device information storage unit, 115 Pattern detection unit, 116 Level detection unit, 201 Pattern storage unit, 202 Control unit, 203 Signal generation unit, 204 Voltage measurement unit, 205 Frequency characteristics Recording unit, 206 Frequency characteristic storage unit, 207 Frequency determination unit, 208 Degradation detection unit, 209 Display unit, 210, 214, 230 Refrigerator, 211, 221 plug, 212, 217 Internal impedance, 213, 218 Harmonic voltage source, 215 , 225 harmonic current source, 216, 226 voltage measuring device, 220, 224 air conditioner, 300 cloud server, 400 terminal device, 410, 420, 510, 520 graph, 500 communication network, 1000, 1100 degradation detection system

Claims (7)

1. Current measuring means for measuring the current flowing through the main breaker;
   A waveform generating means for generating a waveform of the current measured by the current measuring means;
   Feature quantity calculating means for calculating a feature quantity of a harmonic component in the waveform of the current generated by the waveform generating means;
   A pre-degradation device model that associates the type of electrical equipment with the characteristic amount of the harmonic component in the waveform of the current that flows through the main breaker when operating while connected to the outlet before degradation, and the type of electrical equipment and after degradation A device model storage means for storing a post-degradation device model that correlates with a feature quantity of a harmonic component in a waveform of a current that flows through the main breaker when connected to an outlet of the device, and
   Based on the feature amount calculated by the feature amount calculation unit, the feature amount in the pre-degradation device model, and the feature amount in the post-degradation device model, the electric device connected to the outlet after the deterioration is shown Display means for displaying information,
   Deterioration detection device.
2. A basic device model that associates the type of electrical equipment with the characteristic amount of the harmonic component in the waveform of the current flowing through the main breaker when operating directly connected to the main breaker, and the main breaker and the pre-degradation The pre-degradation device model is generated based on the frequency characteristics in the pre-deterioration filter circuit configured by the wiring connecting the outlet and the undegraded outlet, and the basic device model, the main breaker, and the deterioration Further comprising device model generation means for generating the deteriorated device model based on the frequency characteristics in the post-degradation filter circuit constituted by the wiring connecting the later outlet and the deteriorated outlet.
   The deterioration detection apparatus according to claim 1.
3. Based on the feature amount calculated by the feature amount calculation unit and the feature amount in the pre-degradation device model, an operation probability before deterioration, which is a probability that an electrical device is connected to the outlet before deterioration and is operating, is estimated. And a post-degradation operation probability, which is a probability that an electrical device is connected to the outlet after operation based on the feature amount calculated by the feature amount calculation unit and the feature amount in the post-degradation device model. Further comprising a motion probability estimating means for estimating
   The display means, when the pre-deterioration operation probability and the post-degradation operation probability are higher than a predetermined threshold, and the post-deterioration operation probability is higher than the pre-deterioration operation probability, the outlet after the deterioration Display information indicating the electrical equipment connected to the
   The deterioration detection apparatus according to claim 1 or 2.
4. A degradation detection system comprising one or more electrical devices and a degradation detection device,
   The one or more electrical devices are:
   Signal generating means for generating a high-frequency signal between the electrodes of the outlet;
   Voltage measuring means for measuring a voltage between the electrodes;
   Control means for changing the oscillation frequency of the high-frequency signal,
   The control means generates a signal having a pattern peculiar to a device between the electrodes at a frequency obtained by multiplying an oscillation frequency at which the voltage measured by the voltage measuring means reaches a peak by a coefficient exceeding 1. Let the means run regularly,
   The deterioration detecting device is
   Current measuring means for measuring the current flowing through the main breaker;
   A waveform generating means for generating a waveform of the current measured by the current measuring means;
   Device information storage means for storing device information in which the type of electric device and the device-specific pattern are associated with each other;
   Analyzing the frequency of the waveform of the current generated by the waveform generation means, and specifying a frequency at which a signal component having a predetermined intensity or more is detected;
   When a signal having a pattern specific to the device having the frequency specified by the frequency specifying unit is detected in the waveform of the current generated by the waveform generating unit, the type of the electric device and the pattern specific to the device Device information updating means for storing device information in which the frequency specified by the frequency specifying means and the signal level of the device-specific pattern are associated with each other in the device information storage means;
   The difference between the signal level of the device-specific pattern included in the current waveform newly generated by the waveform generation means and the level of the signal of the device-specific pattern in the device information is determined in advance. If it is equal to or more than the threshold value, the information indicating the electrical equipment connected to the outlet after the deterioration, the display means for displaying information indicating the electrical equipment corresponding to the type of the electrical equipment in the equipment information,
   Deterioration detection system.
5. A deterioration detection device mounted on an electrical device,
   Signal generating means for generating a high-frequency signal between the electrodes of the outlet;
   Voltage measuring means for measuring a voltage between the electrodes;
   Control means for changing the oscillation frequency of the high-frequency signal;
   Display means for displaying information notifying that the outlet has deteriorated when the oscillation frequency at which the voltage measured by the voltage measuring means has increased by a predetermined threshold value or more.
   Deterioration detection device.
6. Calculate the characteristic amount of the harmonic component in the waveform of the current flowing through the main breaker,
   In the pre-degradation equipment model in which the calculated feature quantity is associated with the type of electrical equipment and the feature quantity of the harmonic component in the waveform of the current flowing through the main circuit breaker when connected to the outlet before degradation. A feature amount in a deteriorated device model in which a feature amount is associated with a feature amount of a harmonic component in a waveform of a current that flows in the main breaker when operated by being connected to a type of electrical device and an outlet after deterioration, and Displaying information indicating the electrical equipment connected to the degraded outlet based on
   Degradation detection method.
7. Computer
   Waveform generating means for generating a waveform of current flowing through the main breaker;
   Feature quantity calculating means for calculating a feature quantity of a harmonic component in the waveform of the current generated by the waveform generating means;
   A pre-degradation device model that associates the type of electrical equipment with the characteristic amount of the harmonic component in the waveform of the current that flows through the main breaker when operating while connected to the outlet before degradation, and the type of electrical equipment and after degradation A device model storage means for storing a post-degradation device model that correlates with a feature quantity of a harmonic component in a waveform of a current flowing through the main breaker when connected to an outlet
   Based on the feature amount calculated by the feature amount calculation unit, the feature amount in the pre-degradation device model, and the feature amount in the post-degradation device model, the electric device connected to the outlet after the deterioration is shown Function as a display means for displaying information,
   program.

Images