JP7357725B2 - Wiring condition detection device - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act 2020 (38th) National Conference of the Institute of Electrical Equipment Engineers, Collection of Lectures (DVD-ROM) Published on August 1, 2020

The present invention relates to a wiring condition detection device capable of inspecting the condition of wiring.

2. Description of the Related Art Conventionally, a wiring state detection device has been proposed that checks whether the destination and wiring are correct before transmitting power through main lines and outlets.

For example, examples of the above-mentioned wiring state detection device include those disclosed in Patent Documents 1 and 2 listed below. Note that Patent Document 1 discloses a cable checker for checking continuity of a predetermined cable from among a group of cables, which includes a transmitter that is provided at one end of the cable to be inspected and outputs a group of pulse currents with a predetermined pulse width. , a receiver provided at the other end of the cable to be inspected, which detects the sequence of rising and falling of the pulsed current group and determines the direction of the pulsed current group. Checkers are revealed.

Further, Patent Document 2 describes a cable wiring checking device that identifies cables used in electrical wiring and checks for disconnections, and includes an output unit that connects one end of a cable for checking cable wiring that is made up of a plurality of electric wires. , an input section for connecting the other end of the cable for checking cable wiring, and a pulse signal having a different pulse rate transmitted to the cable for checking cable wiring via the output section; a detection unit that detects a pulse signal input to the input unit via the detection unit; a control unit that sequentially checks the wiring of all the electric wires of the cable based on the signal detected by the detection unit; A cable wiring checking device is disclosed, which is equipped with a display section for displaying the detection results for each of the cable wiring checking cables.

Japanese Patent Application Publication No. 2002-257890 Japanese Patent Application Publication No. 2001-128323

However, although the conventional wiring condition detection device described above is usually provided with a capacitor to protect the circuit, the transmitted signal may be attenuated by this capacitor, making it impossible to correctly inspect the wiring condition. was there.

Therefore, the present invention was made in view of the above circumstances, and it is possible to correctly maintain the wiring state without attenuating the transmitted signal even when a capacitor is provided to protect the circuit. It is an object of the present invention to provide a wiring state detection device that can be inspected.

(1) The wiring condition detection device of the present invention is a wiring condition detection device that detects the condition of the wiring for each phase of the wiring having n+1 (n is an integer of 1 or more) phases, A transmitter that is capable of outputting a weak signal to each phase and has a circuit protection capacitor that can be connected to each phase of the wiring; n+1 circuit protection capacitors, each of which is capable of receiving the signal, and which is provided one downstream of each of the phases of the wiring, and one downstream of each of the n+1 capacitors. a receiver having n+1 resistors provided correspondingly, and n+1 measuring units capable of detecting voltages between the capacitor and the resistor corresponding to each phase of the wiring; A reference potential is provided on the transmitter side, a first signal is output from the transmitter to one of the n+1 phases, and the reference potential is different from the phase to which the first signal is output. In the case where a second signal obtained by reversing the phase of the first signal is output from the transmitter for each phase, the receiver corresponds to the phase to which the first signal was transmitted. The measurement unit measures the potential corresponding to the phase to which the first signal is transmitted, using the lowest potential as a reference, and if the measured potential is based only on the second signal, the disconnection occurs. It is characterized by detecting as follows.

According to the configuration (1) above, even if the transmitter and receiver in the wiring condition detection device are each provided with a capacitor for protecting the circuit, the receiver uses the lowest potential as a reference. Since the potential of the first signal is measured, only the phase in which the first signal is passed has a signal level higher than other phases. As a result, it is possible to reliably identify which phase the signal belongs to, and by checking each phase one by one, it is possible to correctly detect whether or not each wiring is disconnected. Furthermore, even if the wiring is live, the transmitter and receiver circuits in this device can be protected by the capacitor.

(2) As another point of view, the wiring condition detection device of the present invention is a wiring condition detection device that detects the condition of the wiring for each phase of the wiring having n+1 (n is an integer of 1 or more) phases. a transmitter capable of outputting a weak signal having a different frequency to each phase of the wiring, and having a circuit protection capacitor connectable to each phase of the wiring; n+1 circuit protection capacitors capable of receiving the signal through each of the phases and provided one on the downstream side of each phase of the wiring; n+1 resistors provided one on each downstream side, and n+1 measuring units capable of detecting voltages between the capacitor and the resistor corresponding to each phase of the wiring; and a receiver having a different frequency for each of the n+1 phases, and when the receiver is unable to detect the signal corresponding to each phase. may be characterized in that it is detected as a misconnection.

According to the configuration (2) above, it is possible to correctly detect whether or not each wiring is incorrectly connected.

(3) In the wiring state detection device of (1) or (2) above, when the transmitter outputs a third signal to one of the plurality of phases, the receiver outputs the third signal. It is preferable that a short circuit be detected when the third signal is not received and is detected to have returned to the transmitter via another one of the n+1 phases.

According to the configuration (3) above, it is further possible to correctly detect whether or not each wiring is short-circuited.

(4) In the wiring state detection devices of (1) to (3) above, each of the measurement units is capable of detecting the voltage between each phase, and one or more of the measurement units detects a predetermined voltage. When the voltage value is measured, it is preferable that the measuring unit activates a notification device that notifies an operator that the wiring is in a live state.

According to the configuration (4) above, it is further possible to correctly detect whether each wiring is a live wire.

1 is a diagram showing the configuration of a wiring state detection device in an embodiment of the present invention. 2 is an external front view of the transmitter shown in FIG. 1. FIG. 2 is an external front view of the receiver shown in FIG. 1. FIG. FIG. 2 is a partially omitted diagram of the configuration of FIG. 1, and is a diagram for explaining a case where a first phase (R phase) is specified. FIG. 2 is a partially omitted diagram of the configuration of FIG. 1 and is a diagram for explaining a determination circuit of a determination section.

Embodiments of the present invention will be described below based on the drawings. As shown in FIG. 1, the wiring state detection device 100 according to the embodiment of the present invention includes a transmitter 1 and a receiver 2, and detects disconnection, disconnection, and It is possible to check whether there are any incorrect connections, short circuits, or live wires.

As shown in FIG. 1, the transmitter 1 includes a signal transmitting/receiving circuit 3 capable of transmitting and receiving signals, a capacitor 4 for the first phase (R phase in this embodiment), and a resistor 5 for the first phase. , a ground 6, a capacitor 7 for the second phase (N phase in this embodiment), a resistor 8 for the second phase, a ground 9, and a capacitor for the third phase (T phase in this embodiment). 10, a resistor 11 for the third phase, a ground 12, a capacitor 13 for the fourth phase (E phase in this embodiment), a resistor 14 for the fourth phase, a ground 15, and terminals 16 to 19. , a power supply section 20, a live wire determination section 21, an alarm buzzer section 22, an LED display section 23, a grounding wire switching section 24, a short circuit determination section 25, and a single-phase/three-phase switching section 26. There is.

Each of the terminals 16 to 19 is a terminal for connecting to each of the first to fourth phase wiring (such as the main line or outlet wiring to which the transmitter 1 and the receiver 2 are connected).

Each of the capacitors 4, 7, 10, and 13 is connected to terminals 16 to 13 in order to protect each circuit in the transmitter 1 in the event that the operator accidentally connects the transmitter 1 to a live wire. 19 are directly connected in series.

The resistor 5 has one end connected to the ground 6 and the other end connected to the wiring between the signal transmitting/receiving circuit 3 and the capacitor 4. The resistor 8 has one end connected to the ground 9 and the other end connected to the wiring between the signal transmitting/receiving circuit 3 and the capacitor 7. The resistor 11 has one end connected to the ground 12 and the other end connected to the wiring between the signal transmitting/receiving circuit 3 and the capacitor 10 . The resistor 14 has one end connected to the ground 15 and the other end connected to the wiring between the signal transmitting/receiving circuit 3 and the capacitor 13.

The signal transmitting/receiving circuit 3 is capable of outputting signals having different phases and different frequencies corresponding to each of the wirings from the first phase to the fourth phase to be checked. For example, when a signal with a certain phase is output to the first phase, inverted signals having a phase opposite to that of the first phase are output to the other three phases.

Although not shown, the power supply section 20 includes a power switch and a power source, and can operate the electric parts in the transmitter 1 by turning on the power switch.

When the transmitter 1 is connected to at least two wirings of the first to fourth phases, the live wire determination unit 21 determines whether the voltage between the connected phases is equal to or higher than a predetermined value (for example, 100∨). It has a voltage detection section (not shown) that detects the voltage. In addition, when the voltage between the connected phases is equal to or higher than a predetermined value, the live line determining unit 21 determines that the connected phases are in a live line state, and sends an activation signal to activate the alarm buzzer unit 22 and the LED display unit 23. This is to control the transmission of information.

When the alarm buzzer section 22 receives an activation signal from the live line determining section 21, it sounds an alarm buzzer to notify the operator that the connected phase wiring is in a live state.

The LED display unit 23 controls the lighting of each of the LEDs 53, 54, 55a to 55d, and 56a to 56d shown in FIG. 2, depending on the state of the first to fourth phase wiring.

The grounding wire switching unit 24 performs on/off switching control for connection to the grounding wire (E phase in this embodiment), and is operated by the grounding wire switching button 52 shown in FIG. can do.

The short-circuit determination unit 25 performs control to determine whether or not each phase connected to the transmitter 1 and receiver 2 is short-circuited. The short-circuit determination unit 25 detects a case where, after the signal transmitting/receiving circuit 3 outputs a signal with a different frequency to each phase, the signal returns to the signal transmitting/receiving circuit 3 via another phase different from that phase. , the phase is determined to be short-circuited, and an abnormality signal is transmitted to the LED display unit 23. On the other hand, if the signal does not return to the signal transmitting/receiving circuit 3 even after a predetermined period of time (for example, 0.1 seconds) has elapsed, the short circuit determining section 25 determines that there is no short circuit, and detects a normal signal. It is transmitted to the LED display section 23. Note that when the short-circuit determining section 25 is operated, signals with different frequencies are output to each phase, and the output of the other phases is stopped.

The single-phase/three-phase switching unit 26 is capable of performing switching control between a single-phase check and a three-phase check, and is capable of performing switching control between a single-phase check and a three-phase check as shown in FIG. It can be operated using the switching button 51.

The front external appearance of the transmitter 1 is as shown in FIG. 2, and includes a single-phase/three-phase switching button 51, a grounding wire switching button 52, and LEDs 53, 54, 55a to 55d, and 56a to 56d. ing.

The single-phase/three-phase switching button 51 is a switch that can switch between performing a single-phase check and performing a three-phase check. Note that the signal may be transmitted from the signal transmitting/receiving circuit 3 to each phase using the operation of the single-phase/three-phase switching button 51 as a trigger.

The grounding wire switching button 52 is an on/off switch for connecting to the grounding wire (E phase in this embodiment), and for example, when checking the outlet, the connection to the grounding wire is turned on and the main line is checked. Turn off the connection to the ground wire in case. Note that the signal may be transmitted from the signal transmitting/receiving circuit 3 to each phase using the operation of the ground wire switching button 52 as a trigger.

When the LED display unit 23 receives a differential signal from the live line determining unit 21, the LED 53 lights up in red, for example, to indicate that the transmitter 1 is connected to a live line. The LED 54 lights up in green, for example, when the power supply unit 20 is turned on.

When the LEDs 55a to 55d are controlled by the single-phase/three-phase switching unit 26 to a state where a single-phase check can be performed, the LEDs 55a to 55d transmit signals to which phase wiring among the first to fourth phases. It lights up to indicate whether there is a short circuit or not. Each of the LEDs 55a to 55d lights up, for example, in red when the LED display unit 23 receives an abnormal signal for each phase from the short-circuit determination unit 25, and lights up in green, for example, when the LED display unit 23 receives a normal signal. A phase (for example, E phase) that is not used (for example) is in a non-lighting state.

When the single-phase/three-phase switching unit 26 is controlling the LEDs 56a to 56d to a state where three phases can be checked, the LEDs 56a to 56d are configured to send signals to which phase wiring among the 1st to 4th phases. It lights up to indicate whether there is a short circuit or not. Note that each of the LEDs 56a to 56d lights up, for example, in red when the LED display unit 23 receives an abnormal signal for each phase from the short circuit determination unit 25, and lights up in green, for example, when the LED display unit 23 receives a normal signal, and receives the signal. A phase (for example, E phase) that is not used (for example) is in a non-lighting state.

As shown in FIG. 1, the receiver 2 includes a first phase capacitor 30, a first phase resistor 31, a first phase measuring section 32, a second phase capacitor 33, and a second phase capacitor 30. A phase resistor 34, a second phase measuring section 35, a third phase capacitor 36, a third phase resistor 37, a third phase measuring section 38, a fourth phase capacitor 39, The fourth phase resistor 40, the fourth phase measurement section 41, the analog ground 42, the determination section 43, the alarm buzzer section 44, the LED display section 45, the measurement start section 46, and the terminals 47 to 50. , a power source 27.

Capacitors 30, 33, 36, and 39 are provided on the wiring connection side of the circuit in order to protect the circuit inside the receiver 2 if the operator accidentally connects the receiver 2 to a live wire. It is being

The first phase measuring section 32 is capable of measuring the voltage between the capacitor 30 and the resistor 31. The second phase measuring section 35 is capable of measuring the voltage between the capacitor 33 and the resistor 34. The third phase measuring section 38 is capable of measuring the voltage between the capacitor 36 and the resistor 37. The fourth phase measuring section 41 is capable of measuring the voltage between the capacitor 39 and the resistor 40.

Each of the terminals 47 to 50 is a terminal for connecting to the first to fourth phase wiring in order. As shown in FIGS. 2 and 3, the first phase check wiring is connected between the terminals 16 and 47, the second phase check wiring is connected between the terminals 17 and 48, and the terminals 18, A third phase check wiring is connected between the terminals 19 and 50, and a fourth phase check wiring is connected between the terminals 19 and 50.

The determination unit 43 is provided with a determination circuit that determines whether the line is live, which phase the signal has passed through, which phase is disconnected or not, which phase is incorrectly connected, and the like. ing. The control of each determination will be explained below.

<Determination of live wire>
The determination unit 43 determines whether the voltage between each phase is a predetermined value ( For example, it is determined whether the value is 100∨ or more. When the voltage between at least one phase is equal to or higher than a predetermined value, the determination unit 43 determines that the phase is in a live state, and controls to send an activation signal to activate the alarm buzzer unit 44 and the LED display unit 45. This is what we do.

<Determination of disconnection>
When the transmitter 1 outputs signals with different frequencies to each of the first to fourth phases, and the receiver 2 receives each signal, the determination unit 43 determines whether the phase for which the signal could not be received is disconnected. It is determined that the disconnection signal is present, and a disconnection signal is transmitted to the LED display section 45. On the other hand, the determining unit 43 determines that the phase for which the signal has been received is not disconnected, and transmits a normal signal to the LED display unit 45. Specifically, for example, if the first phase measurement unit 32 cannot receive a signal in the first phase but can receive a signal in the other phases, the determination unit 43 determines that the first phase is disconnected. , transmits a disconnection signal for the first phase to the LED display section 45, determines that the other phases are not disconnected, and transmits a normal signal for the other phases to the LED display section 45.

Note that when a weak current is used for the signal output from the transmitter 1, disconnection may be determined as follows. There is a reference potential on the transmitter 1 side, and for example, a 2.6 kHz signal is output between the reference potential and the first phase, and an inverted 2.6 kHz signal is output to the other phases. In the receiver 2, the signal level can be increased by measuring the potential of the first phase with the first phase measuring section using the lowest potential as a reference. By doing the same for other phases, the signal level can be increased, so a capacitor is installed in series with each phase to protect the circuit, preventing the signal level from dropping. be able to.

<Determination of incorrect wiring>
When the determination unit 43 determines a misconnection, it is necessary to specify which phase the signal from the transmitter 1 corresponds to. First, the main determination will be explained. Here, an example will be described in which the first phase (R phase), second phase (N phase), and third phase (T phase) (in the case of a lighting circuit) are determined. Here, FIG. 4 is a partially omitted diagram of the configuration of FIG. 1, and is a diagram for explaining the case where the first phase (R phase) is specified. Further, FIG. 5 is a partially omitted diagram of the configuration of FIG. 1, and is a diagram for explaining the determination circuit of the determination section.

First, for example, as shown in FIG. 4, the transmitter 1 outputs each signal by inverting the phase of only the first phase (R phase) signal with respect to the other phase signals. Furthermore, in order to make a correct judgment even when the transmitted signal is attenuated, the potential of the transmitted signal is measured based on the lowest potential of each measurement section of the receiver 2, and only the first phase (R phase) is higher than the other phases. Increase the signal level. For example, as shown in FIG. 4, the signal levels are changed by changing the low-side signal as a reference in the first phase measuring section 32, the second phase measuring section 35, and the third phase measuring section 38. Thereby, the determining unit 43 can reliably identify whether the signal is a first phase (R phase) signal or not via the first phase measuring unit 32 . The remaining second phase (N phase) signals and third phase (T phase) signals are also identified using the same procedure. With these, the determination unit 43 can reliably identify which phase the signal is.

Next, the determining unit 43 determines whether the identified signal is correctly connected (or incorrectly connected). Specifically, first, the frequencies of the signals output from the transmitter 1 to each phase are made to differ by one. In addition, when the identified signal is a correctly connected phase, the frequency of this identified signal and the value of the determination frequency set in each determination circuit provided in the determination unit 43 corresponding to that phase. will match. In such a case, the determining unit 43 determines that the phase is normal (no erroneous connection), and transmits an abnormal signal corresponding to that phase to the LED display unit 45.

Here, for example, as shown in FIG. 5(a), the frequency of the first phase (R phase) signal output from the transmitter 1 is set to 2.6 kHz, and the frequency of the second phase (N phase) signal is set to 2.6 kHz. The frequency is 2.4 kHz, the frequency of the third phase (T phase) signal is 2.2 kHz, the frequency for determination set in the first phase determination circuit 43a is 2.6 kHz, and the second phase determination circuit 43b is set. If the frequency for determination set in the determination circuit 43a for the first phase is 2.4kHz, and the frequency for determination set in the determination circuit 43c for the third phase is 2.2kHz, the determination frequency for the first phase determination circuit 43a and the determination frequency for the second phase The circuit 43b and the third phase determination circuit 43c determine that the connections of the respective phases are normal. That is, the determining unit 43 determines that the connection of each phase is normal, and transmits a normal signal corresponding to each phase to the LED display unit 45.

On the other hand, if there is a phase in which the identified signal is not correctly connected, a signal different from the determination frequency value set in the determination circuit provided in the determination unit 43 corresponding to that phase is received. It turns out. In such a case, the determining unit 43 determines that there is an abnormality (misconnection), and transmits an abnormal signal corresponding to the phase to the LED display unit 45.

Here, for example, as shown in FIG. 5(b), the frequency of the first phase (R phase) signal output from the transmitter 1 is set to 2.6 kHz, and the frequency of the second phase (N phase) signal is set to 2.6 kHz. The frequency is 2.4 kHz, the frequency of the third phase (T phase) signal is 2.2 kHz, the frequency for determination set in the first phase determination circuit 43a is 2.6 kHz, and the second phase determination circuit 43b is set. If the determination frequency set in the third phase determination circuit 43c is 2.4kHz, and the determination frequency set in the third phase determination circuit 43c is 2.2kHz, the first phase determination circuit 43a and the second phase determination circuit 43a The circuit 43b determines that each connection is abnormal, and the third phase determination circuit 43c determines that the connection is normal. That is, the determining unit 43 determines that the wiring of the first phase and the second phase is abnormal (erroneous wiring) and that the wiring of the third phase is normal, and outputs abnormal signals corresponding to the first and second phases, A normal signal corresponding to the third phase is transmitted to the LED display section 45.

Based on these, the determining unit 43 can determine whether the specified signal is correctly connected (or incorrectly connected).

When the alarm buzzer unit 44 receives an activation signal from the determination unit 43, it sounds an alarm buzzer to notify the operator that the connected phase wiring is in a live state.

The LED display unit 45 displays the LEDs 61, 62a to 62c, 63a to 63c, 64, and Control is performed to turn on each of 65, 66a to 66d, and 67a to 67d. For example, the control section (not shown) of the LED display section 45 causes each of the LEDs 61, 62a to 62c, 63a to 63c, 64, 65, 66a to 66d, and 67a to 67d to light up in green if normal, and light in red if abnormal. etc., the emitted light color is controlled to change depending on the type of signal.

The measurement start section 46 determines whether or not to start measurement in the first phase measurement section 32, second phase measurement section 35, third phase measurement section 38, and fourth phase measurement section 41, as shown in FIG. Control is performed depending on whether or not the button 60 is operated. Furthermore, the measurement start section 46 has a switch function connected to the power supply 27, and by operating the measurement start button 60 shown in FIG. It's supposed to work.

The front appearance of the receiver 2 is as shown in FIG. 3, and includes a measurement start button 60 and LEDs 61, 62a to 62c, 63a to 63c, 64, 65, 66a to 66d, and 67a to 67d.

The measurement start button 60 is an operation button for starting the measurement of the wiring state of each phase, and is operated after the transmitter 1 and receiver 2 are connected to each phase to check the wiring state of each phase. measurement is now started.

When the LED display section 45 receives a differential signal from the determination section 43, the LED 61 lights up in red, for example, to indicate that the receiver 2 is connected to a live wire. The LEDs 62a to 62c light up, for example, in red when the phase rotation is abnormal. The LEDs 63a to 63c light up, for example, in green when the phase rotation is normal. The LED 64 lights up, for example, in green based on the signal that the LED display section 45 receives from the determination section 43 when the connection state is normal and there is no disconnection. The LED 65 lights up in red, for example, based on the signal that the LED display section 45 receives from the determination section 43 when the connection state is abnormal or there is a disconnection.

When the LEDs 66a to 66d are controlled by the single-phase/three-phase switching unit 26 to be able to perform a single-phase check, the LED display unit 45 receives information from the determination unit 43 in the phase where the connection state is normal. Based on the signal received from the determination unit 43, the LED display unit 45 lights up in green, for example, and in the phase where the connection state is abnormal, the LED display unit 45 lights up in red, based on the signal received from the determination unit 43, and does not receive a signal. In a phase (for example, E phase) in which the light is not lit, the light is not lit.

When the single-phase/three-phase switching unit 26 controls the LEDs 67a to 67d so that a three-phase check can be performed, the LEDs 67a to 67d light up in green, for example, based on the normal signal in the phase where the connection status is normal. In a phase in which the wiring state is abnormal, the light is lit in red, for example, based on the abnormal signal, and in a phase (for example, E phase) that does not receive a signal (is not used), the light is not lit.

Here, a specific example will be shown regarding the relationship between the connection state and the display on the receiver.

(When checking trunk line (single-phase three-wire))
Table 1 shows an example of checking the connection of main lines (single-phase three-wire). In Table 1, (a) is an example of a normal state, and (b) to (e) are examples of an abnormal state. Here, the transmitter in the connection state column of Table 1 is the transmitter 1 of this embodiment, and the receiver is the receiver 2 of this embodiment. Furthermore, the filled-in portions indicate a state in which the LED is lit in green, and the hatched portion indicates a state in which the LED is lit in red. The same applies to each table below.

(When checking main line (three-phase three-wire))
Table 2 shows an example of checking the connection of main lines (three-phase, three-wire). In Table 2, (a) is an example of a normal state, and (b) to (e) are examples of an abnormal state.

(When checking 2P outlet (100V))
Table 3 shows an example of checking the connection of a 2P outlet. In Table 3, (a) is an example of a normal state, and (b) to (e) are examples of an abnormal state. In (a), the "abnormal" LED is lit in order to be able to distinguish it from the case where the E phase is not connected when checking the connection of the 3P outlet, which will be described later. Further, in the case of a complex abnormality, each abnormality display is displayed on the LED.

(When checking 3P outlet (100V))
Tables 4 and 5 show examples of checking the wiring of 3P outlets. (a) of Table 4 is an example of a normal state, and (b) to (d) of Table 4 and (e) to (g) of Table 5 are examples of an abnormal state. In Table 5 (g), the "abnormal" LED is lit in order to distinguish it from the normal state (Table 3 (a)) in the above-mentioned 2P outlet connection check. Further, in the case of a complex abnormality, each abnormality display is displayed on the LED.

(When checking 4P outlet)
Tables 4 and 5 show examples of checking the wiring of a 4P outlet. (a) of Table 4 is an example of a normal state, and (b) to (d) of Table 4 and (e) to (g) of Table 5 are examples of an abnormal state. Further, in the case of a complex abnormality, each abnormality display is displayed on the LED.

As described above, in the wiring state detection device 100 according to the present embodiment, even if the transmitter 1 and the receiver 2 are each provided with a capacitor for protecting the circuit, the receiver 2 has the most Since the signal potential is measured using a low potential as a reference, only the phase in which the signal is passed has a higher signal level than other phases. As a result, it is possible to reliably identify which phase the signal belongs to, and by checking each phase one by one, it is possible to correctly detect whether or not each wiring is disconnected. Furthermore, even if the wiring is live, the transmitter and receiver circuits in this device can be protected by the capacitor.

In addition, the wiring condition detection device 100 can not only correctly detect whether each wiring is short-circuited, but also detect whether each wiring is incorrectly connected or not, and whether each wiring is live. It is possible to accurately detect whether the phase rotation is normal or not.

The above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all changes within the meaning and scope equivalent to the claims.

1 Transmitter 2 Receiver 3 Signal transmitting/receiving circuit 4, 7, 10, 13, 30, 33, 36, 39 Capacitor 5, 8, 11, 14, 31, 34, 37, 40 Resistor 6, 9, 12, 15 Ground 16, 17, 18, 19, 47, 48, 49, 50 Terminal 20 Power supply section 21 Live wire determination section 22, 44 Alarm buzzer section 23, 45 LED display section 24 Ground wire switching section 25 Short circuit determination section 26 Single phase/three Phase switching section 27 Power supply 32 First phase measurement section 35 Second phase measurement section 38 Third phase measurement section 41 Fourth phase measurement section 42 Analog ground 43 Judgment section 43a First phase judgment circuit 43b Second phase judgment circuit 43c Third phase determination circuit 46 Measurement start section 51 Three phase switching button 52 Grounding wire switching buttons 53, 54, 55a to 55d, 56a to 56d, 61, 62a to 62c, 63a to 63c, 64, 65, 66a to 66d, 67a-67d LED
60 Measurement start button 100 Wiring condition detection device

Claims (3)

A wiring state detection device that detects the state of wiring for each phase of a wiring having n+1 (n is an integer of 1 or more) phases,
A transmitter capable of outputting a signal having a frequency of 2.2 kHz or more and 2.6 kHz or less to each of the wiring phases, and having a circuit protection capacitor that can be connected to each of the wiring phases. ,
n+1 circuit protection capacitors capable of receiving the signal via each of the phases of the wiring, and provided one on the downstream side of each phase of the wiring; n+1 resistors provided one by one on the downstream side of each of the capacitors, and n+1 measuring units capable of detecting each voltage between the n+1 capacitors and the n+1 resistors; , a determination unit that determines whether each of the phases is disconnected based on each voltage value measured by the n+1 measurement units;
Equipped with
A reference potential is provided on the transmitter side,
A first signal having a frequency of 2.6 kHz is output from the transmitter to one of the n+1 phases, and a first signal having a frequency of 2.6 kHz is output from the transmitter to each of the phases different from the phase to which the first signal was output. When a second signal obtained by reversing the phase of the first signal is output, the measuring section of the receiver corresponding to the phase to which the first signal was transmitted is configured to measure the measuring section of the receiver corresponding to the phase to which the first signal was transmitted. The determining unit measures a potential corresponding to the phase to which the first signal is transmitted (hereinafter referred to as a first potential) based on the lowest potential measured by the measuring unit of the receiver, and the determining unit measures the lowest potential measured by the measuring unit of the receiver. determines that the phase to which the first signal is transmitted is disconnected if the potential of the different phase is not greater than the potential of the different phase;
Wiring condition detection device. A wiring state detection device that detects the state of wiring for each phase of a wiring having n+1 (n is an integer of 1 or more) phases,
A transmitter capable of outputting a signal having a frequency of 2.2 kHz or more and 2.6 kHz or less to each of the wiring phases, and having a circuit protection capacitor that can be connected to each of the wiring phases. ,
n+1 circuit protection capacitors capable of receiving the signal via each of the phases of the wiring, and provided one on the downstream side of each phase of the wiring; n+1 resistors provided one by one on the downstream side of each of the capacitors, and n+1 measuring units capable of detecting each voltage between the n+1 capacitors and the n+1 resistors; , based on n+1 determination circuits provided one downstream of each phase of the wiring, and each signal received by the n+1 determination circuits, determine whether each phase is incorrectly connected. a receiver having a determination unit that determines whether the
Equipped with
A reference potential is provided on the transmitter side,
The transmitter is capable of outputting a signal with a different frequency (frequency range is 2.2 kHz or more and 2.6 kHz or less) for each of the n+1 phases,
Each of the determination circuits determines whether or not each of the signals having different frequencies corresponding to each phase is detected, depending on whether or not a signal having a determination frequency preset in each of the determination circuits is received. and
A first signal having a frequency of 2.2 kHz or more and 2.6 kHz or less is output from the transmitter to one of the n+1 phases, and the first signal is connected to the phase from which the first signal was output. is a second signal obtained by reversing the phase of the first signal from the transmitter and having a frequency different from that of the first signal, in each of different phases, and the phase to which the first signal was transmitted is The measurement unit of the receiver corresponding to the different phase calculates the potential corresponding to the phase to which the first signal was transmitted based on the lowest potential measured by the measurement unit of the receiver corresponding to the different phase. measure,
The determination unit is configured to detect, in the receiver, a signal with a different frequency corresponding to each phase by the determination circuit when the transmitter outputs a signal with a different frequency for each of the n+1 phases. If it is not possible to do so, it is determined as incorrect connection.
Wiring condition detection device. Each of the measurement units is capable of detecting the voltage between each phase (hereinafter referred to as measurement voltage) ,
When one or more of the measuring units measure that the measured voltage is equal to or higher than a predetermined value , the measuring unit activates a notification device that notifies an operator that the wiring is in a live state. The wiring state detection device according to claim 1 or 2 .

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