JP2014137346A - Electric power measurement device cable bypass connection assist system and electric power measurement device cable bypass connection method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bypass connection assist system and a bypass connection method for safely removing a measurement instrument cable from an electric power measurement device with reduction in a work burden, and without causing a short circuit, a blackout and an abnormal voltage inflow upon a bypass connection.SOLUTION: An uninterruptible bypass connection assist system 1 comprises: power source side sensors 21 to 23 that are arranged at power source side measurement instrument cables 11 to 13 of an electric power meter 10, and measure electric current and voltage values; and burden side sensors 24 to 26 that are arranged at burden side measurement instrument cables 14 to 16, and measure electric current and voltage values, in which the power source side sensors 21 to 23, and the burden side sensors 24 to 26 include a transmission section that transmits the measured electric current and voltage values wirelessly. The system 1 further comprises: a reception section 41 that receives the electric current and voltage values wirelessly; a determination section 43 that determines a distribution current after subjected to the bypass connection to see if any of the power source side measurement instrument cable and the burden side measurement instrument cable are in phase on the basis of the received values; a display section 44 that displays a determination result; and a warning notification section 45 that gives a warning sound when there is abnormality in the distribution current.

Description

  The present invention relates to a bypass connection support system for bypassing a power source side and a load side instrument cable of a power measurement device and exchanging the power measurement device without a power failure, and a bypass connection method using the bypass connection support system.

  Conventionally, when replacing the power measurement device connected to the instrument cable, connect the instrument cable on the power supply side and the load side instrument cable with a bypass cable, and then remove the power measurement device from the instrument cable. Sometimes power outages are prevented.

  When bypassing the instrument cable on the power supply side and the instrument cable on the load side, it is necessary to confirm that the instrument cables connected by the bypass cable are in phase. For example, the operator confirms the phase order identification mark, the power supply side identification mark, and the load side identification mark attached to each cable visually.

  However, it may be difficult to confirm whether or not the power meter is in phase, such as when the place where the power meter is arranged is small.

  Therefore, as another method of confirming whether or not they are in phase, for example, a relay is provided in the middle of the bypass cable, and the logical difference is checked at the time of bypass connection, such as the potential difference between the power supply side and load side of each phase. In addition, a method is also employed in which the check result of whether or not they are in phase is displayed with a lamp to allow the operator to confirm.

  As a phase detection device and a phase detection method between power cables, for example, JP 2000-162258 A (Patent Document 1) describes a phase detector for performing phase detection of distribution lines between points far apart. Has been. This phase detector detects the phase voltage of the distribution line at each phase detection point and outputs the phase detection signal, the phase detection signal of the transmission side detection unit and the phase detection signal of the transmission side detection unit. A receiving-side interface unit that compares the phase of the phase detection signal and determines whether the distribution line is in phase or out of phase based on the comparison result is provided. In addition, an in-phase lamp that is turned on when the phase is in phase or a different phase lamp that is turned on when the phase is out of phase is provided. It is described that a piezoelectric buzzer sounds at the same time when it lights up.

  In Japanese Utility Model Publication No. 7-43241 (Patent Document 2), a detecting means for detecting phase information by making contact with a power line, and receiving phase information detected by the detecting means to identify a phase relationship between the phase information. There is described a phase detector including a determination unit that performs the display and a display unit that displays the phase relationship between the phase information based on the identification result.

  Further, for example, a method of replacing the watt hour meter without using a bypass cable has been proposed. Japanese Patent Application Laid-Open No. 8-114629 (Patent Document 3) describes a method for replacing a single-phase three-wire watt-hour meter. In the method described in Patent Document 3, the first-phase wiring, the second-phase wiring, and the third-phase wiring on the load side of the watt-hour meter are respectively connected to one end-side connection terminal of a single-winding transformer winding, Connect the line connection terminal and the other end side connection terminal, and then remove the specific power supply side wiring and the corresponding load side wiring and connect them externally. How to connect.

JP 2000-162258 A Japanese Utility Model Publication No. 7-43241 JP-A-8-114629

  However, the phase detector of Patent Document 1 is for determining whether each phase detection target line between two distant points is in phase or in phase. It is not used to check the distribution line connected to the power meter, bypass the distribution line determined to be in-phase, and replace the watt hour meter.

  Further, Patent Document 2 does not describe that the distribution line connected to the wattmeter is phase-detected, the distribution line determined to be in-phase is bypassed, and the watt hour meter is replaced.

  Moreover, in the method described in Patent Document 3, it is impossible to detect which load side wiring corresponds to a specific power source side wiring.

  Further, when a relay is provided in the middle of the bypass cable, there are the following problems. That is, the relay device main body is less than 1 kg, and is a considerable size. In addition, since it does not have a function for checking the current split, there is a risk of power failure when the instrument is removed, or inadvertent voltage inflow if there is a lack of connection to the neutral wire.

  Currently, electrical appliances are frequently used, and if a power failure occurs or an abnormal voltage flows in, the reservation set by the user for the electrical appliance, for example, the recording reservation for the recorder or the air conditioning setting reservation for the air conditioner is canceled. Some will be done. Therefore, even if it is difficult to replace the power meter, such as when the power meter is installed in a narrow place, it is required to complete the replacement without power failure.

  Accordingly, an object of the present invention is to reduce the burden on the operator when removing the instrument cable connected to the power measuring device from the power measuring device, and to complete the work without power failure. It is intended to provide a cable bypass connection support system and a cable bypass connection method of a power measuring device using the cable bypass connection support system.

  The power measurement device cable bypass connection support system according to the present invention is a system that supports bypass connection of the same-phase instrument cable on the power supply side and load side of the power measurement device with a bypass cable.

  A bypass connection support system according to the present invention includes a power-side non-contact power meter that is arranged on a power-side instrument cable of a power measuring device and measures current and voltage values, and a load-side meter cable of the power measuring device. And a load-side non-contact power meter that measures current and voltage values. The power source side non-contact power meter and the load side non-contact power meter include a transmitter that wirelessly transmits the measured current and voltage values.

  The bypass connection support system further includes a reception unit that wirelessly receives the current and voltage values transmitted from the transmission unit, a determination unit, and a display unit. The determination unit includes a current and a voltage value received by the receiving unit from the transmitting unit of the power source-side non-contact power measuring instrument, and a current received by the receiving unit from the transmitting unit of the load-side non-contact power measuring unit. Is compared with the voltage value, it is determined whether or not the instrument cable in which the power supply-side non-contact power meter is disposed and the instrument cable in which the load-side non-contact power meter is disposed are in phase. The display unit displays the result determined by the determination unit.

  The transmitter and receiver of the power-side non-contact power meter and load-side non-contact power meter transmit and receive current and voltage values wirelessly, so the receiver is connected to the power-source non-contact power meter and load-side non-power meter. It can be moved separately from the contact power meter. For example, by arranging the receiving unit and the display unit on the operator's personal digital assistant (PDA), the operator can check the display unit at hand.

  By using the bypass connection support system configured as described above, the operator can visually find the phase detection result displayed on the display unit, easily find the instrument cable of the in-phase set, and easily determine the instrument of the in-phase set. Cables can be connected with a bypass cable.

  By doing so, the cable of the power measuring device that can reduce the burden on the operator when removing the instrument cable connected to the power measuring device from the power measuring device and complete the work without a power failure. A bypass connection support system can be provided.

  Moreover, it is preferable that the bypass connection support system according to the present invention includes a plurality of power source side non-contact power measuring instruments and a plurality of load side non-contact power measuring instruments.

  By doing in this way, repetition of work can be reduced.

  Further, in the bypass connection support system according to the present invention, the power-side non-contact power measuring instrument and the load-side non-contact power measuring instrument can secure operating power by the leakage magnetic flux from the instrument cable. It is preferable that it is comprised.

  Since the power-side non-contact power meter and the load-side non-contact power meter ensure operating power by the leakage magnetic flux from the instrument cable, it is not necessary to provide a separate power source, and the entire system can be downsized.

  Moreover, it is preferable that the bypass connection support system according to the present invention includes a connector that is attached to both ends of the bypass cable and can penetrate the sheath of the instrument cable.

  Since the connector penetrates the sheath of the instrument cable, the operator can easily connect the bypass cable to the instrument cable.

  In addition, the bypass connection support system according to the present invention preferably includes a storage unit that stores a current value measured by the power source-side non-contact power meter or the load-side non-contact power meter before bypass connection. The determination unit is preferably configured to determine whether or not the value of the current flowing through the instrument cable after the bypass connection is decreased at a predetermined ratio with respect to the value of the current before bypass.

  At this time, the determination unit reduces the current value measured by the power source side non-contact power meter or the load side non-contact power meter after the bypass connection at a predetermined ratio with respect to the pre-bypass current value. It is preferable to determine whether or not. Alternatively, a bypass cable current measuring instrument that is disposed in the bypass cable and measures at least the current value is provided, and the determination unit determines the current value measured by the bypass cable current measuring instrument after bypass connection with respect to the current value before bypassing. Based on whether or not the ratio is larger than a predetermined value, it is determined whether or not the value of the current flowing through the instrument cable after the bypass connection is decreased by a predetermined ratio with respect to the value of the current before bypass. Also good.

The bypass connection support system according to the present invention preferably includes an alarm unit. The alarm section
It is preferable that an alarm sound be generated when the determination unit determines that the divided current value has not decreased at a predetermined ratio with respect to the value of the current before bypass.

  The cable bypass connection method of the power measuring apparatus using the bypass connection support system according to the present invention includes the following steps AK.

  Step A is a step in which an operator arranges a power source-side non-contact power meter in each of a plurality of power source-side instrument cables. Step B is a step in which an operator places a load-side non-contact power meter in each of a plurality of load-side instrument cables.

  Step C is a step in which the transmitter transmits the current and voltage values measured by the power source-side non-contact power meter, and the receiver receives them. Step D is a step in which the transmitter transmits the current and voltage values measured by the load-side non-contact power meter and the receiver receives them. Step E is a step in which the storage unit stores the current value received by the receiving unit as a pre-bypass current.

  Step F includes the values of the current and voltage received by the receiver from the transmitter of the power-side non-contact power meter, and the current and voltage values received by the receiver from the transmitter of the load-side non-contact power meter. By comparing, the determination unit determines whether or not the instrument cable in which the power supply-side non-contact power meter is arranged and the instrument cable in which the load-side non-contact power meter is arranged are in phase. Step G is a step in which the display unit displays the result determined by the determination unit.

  Step H is a step in which the operator bypass-connects the power-side instrument cable and the load-side instrument cable determined to be in phase by the determination unit using a bypass cable.

  Step I is the value of the shunt current measured by the power-side non-contact power meter placed on the power-side instrument cable connected by bypass or the load-side non-power placed on the load-side meter cable bypassed. In this step, at least one of the current values measured by the contact power meter is transmitted by the transmission unit and received by the reception unit.

  In step J, the determination unit determines whether or not the current value received by the receiving unit in step I is decreased at a predetermined ratio with respect to the pre-bypass current value stored in the storage unit in step E. It is a step to do.

  Step K is a step in which the alarm unit emits an alarm sound when it is determined in step J that the value of the divided current has not decreased at a predetermined ratio with respect to the value of the current before bypass.

  By doing so, the cable of the power measuring device that can reduce the burden on the operator when removing the instrument cable connected to the power measuring device from the power measuring device and complete the work without a power failure. A bypass connection method can be provided.

  As described above, according to the present invention, there is no power failure, the instrument cable connected to the power measuring device is short-circuited from the power measuring device at the time of bypass connection, or without power failure or inflow of abnormal voltage. It is possible to provide a cable bypass connection support system for a power measuring device that can be removed and a method for bypassing a cable for a power measuring device using the same.

It is a figure which shows typically the structure of the uninterruptible bypass connection assistance system of 1st Embodiment of this invention. It is a flowchart which shows process S1-S8 of the uninterruptible bypass connection using the uninterruptible bypass connection support system of 1st Embodiment in order. It is a flowchart which shows process S9-S17 of the uninterruptible bypass connection using the uninterruptible bypass connection support system of 1st Embodiment in order. It is a figure showing typically the state where marking was given to each instrument cable of the uninterruptible bypass connection support system of a 1st embodiment. It is a figure which shows typically the state by which the sensor was attached to each instrument cable of the uninterruptible bypass connection support system of 1st Embodiment, and the phase detection result was displayed. It is a figure which shows typically the state by which the sensor was attached to each instrument cable of the uninterruptible bypass connection support system of 1st Embodiment, and the electric current value of each phase was displayed. It is a figure which shows typically the state by which the cables of the same phase of the uninterruptible bypass connection support system of 1st Embodiment were connected by the bypass cable, and the value of the shunt current was displayed. It is a figure which shows typically the state by which each instrument cable of the uninterruptible bypass connection assistance system of 1st Embodiment was removed from the electric power measurement apparatus. It is a figure which shows typically the state by which the sensor was attached to 1 set of instrument cables in the uninterruptible bypass connection support system of 2nd Embodiment, and the phase detection result was shown. It is a figure which shows typically the state by which the sensor was attached to another group of instrument cables in the uninterruptible bypass connection support system of 2nd Embodiment, and the phase detection result was shown. It is a figure which shows typically the state by which the cables of the same phase of the uninterruptible bypass connection support system of 2nd Embodiment were connected by the bypass cable, and the value of the shunt current was displayed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a state in which the instrument cable of the power measuring device is bypass-connected. As shown in FIG. 1, the uninterruptible bypass connection support system 1 according to the first embodiment of the present invention is mainly connected to power-side instrument cables 11, 12, 13 and load-side instrument cables 14, 15, 16. Power meter 10, power source side sensors 21, 22, and 23 disposed on power source side instrument cables 11, 12, and 13, respectively, and load side sensors 24 and 25 disposed on load side instrument cables 14, 15, and 16, respectively. , 26, bypass cables 31, 32, 33 for bypass-connecting the power-side instrument cables 11, 12, 13 and the load-side instrument cables 14, 15, 16, and a personal digital assistant (PDA) 40. . The power meter 10 is an example of a power measuring device. The power supply side sensors 21, 22, and 23 are an example of a power supply side non-contact power measuring instrument. The load side sensors 24, 25, and 26 are examples of load side non-contact power measuring instruments.

  The power source side instrument cables 11, 12, 13 are connected to the power source side of the power meter 10, and the load side instrument cables 14, 15, 16 are connected to the load side of the power meter 10.

  A power supply side sensor 21 is attached to the power supply side instrument cable 11. The power source side sensor 21 is configured to ensure operating power by the leakage magnetic flux from the instrument cable 11 and measures the current and voltage of the instrument cable 11 in a non-contact manner. The power supply side sensor 21 includes a transmission unit 211 that wirelessly transmits the measured current and voltage values.

  The power supply side sensors 22, 23 and the load side sensors 24, 25, 26 are also configured in the same manner as the power supply side sensor 21, and transmit units 221, 231, 241, 251, respectively configured similarly to the transmit unit 211. 261.

  The power supply side sensors 21, 22, and 23 are color-coded or labeled so that the operator can visually distinguish them. In this embodiment, labels with identification symbols “1S”, “2S”, and “3S” are attached. Similarly, the load side sensor 24.25.26 is color-coded or labeled. In this embodiment, labels on which identification symbols “1L”, “2L”, and “3L” are displayed are attached. Further, the power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26 store the identification symbols displayed on the respective labels in a storage unit (not shown).

  In this embodiment, the bypass cable 31 connects the power-side instrument cable 11 and the load-side instrument cable 14. A power supply side connector 311 and a load side connector 312 are attached to both ends of the bypass cable 31. The power supply side connector 311 and the load side connector 312 are formed in a clamp shape, for example, and pass through the covering of the power supply side instrument cable 11 and the load side instrument cable 14. A current limiting fuse may be attached to the center of the bypass cable 31. As the connector, for example, an electric wire clamp described in Japanese Patent No. 3418925 can be used.

  The bypass cables 32 and 33 are configured similarly to the bypass cable 31. The bypass cable 32 bypasses the power supply side instrument cable 12 and the load side instrument cable 15, and the bypass cable 33 bypasses the power supply side instrument cable 13 and the load side instrument cable 16. The operator confirms that the combination of the power-side instrument cables 11, 12, 13 and the load-side instrument cables 14, 15, 16 bypassed by the bypass cables 31, 32, 33 is in phase as will be described later. It is a pair.

  The power supply side connector 321 and the load side connector 322 attached to the bypass cable 32 and the power supply side connector 331 and the load side connector 332 attached to the bypass cable 33 are configured in the same manner as the power supply side connector 311 and the load side connector 312. ing.

  The power supply side connectors 311, 321, 331 of the bypass cables 31, 32, 33 are attached upstream of the power supply side sensors 21, 22, 23. The load side connectors 312, 322, 332 of the bypass cables 31, 32, 33 are attached to the downstream side of the load side sensors 24, 25, 26.

  In the portable information terminal 40, the power meter 10, the power supply side sensors 21, 22, 23, and the load side sensors 24, 25, 26 are formed separately, and are configured to be carried by an operator. The portable information terminal 40 mainly includes a reception unit 41, a storage unit 42, a determination unit 43, a display unit 44, and an alarm unit 45.

  The reception unit 41 wirelessly receives information such as identification symbols and current and voltage values transmitted from the transmission units 211, 221, 231, 241, 251, 261. Information received by the receiving unit 41 is transmitted to the storage unit 42.

  The storage unit 42 stores information transmitted from the transmission unit 41.

  The determination unit 43 reads the information stored in the storage unit 42 and causes the display unit 44 to display the information. As will be described later, the determination unit 43 also reads out information stored in the storage unit 42 and performs an operation as necessary. If the result of the operation, for example, the result of phase detection or the current value is less than a predetermined ratio, Whether or not there is is displayed on the display unit 44. The display unit 44 is configured to be visible to the operator. The determination unit 43 serves as both a calculation unit and a control unit.

  The determination unit 43 is further configured to control the alarm unit 45 and cause the alarm unit 45 to generate an alarm sound based on the calculation result using the information read from the storage unit 42.

  Next, based on the flowcharts of FIGS. 2 to 3 and FIGS. 4 to 8 representing the respective states, for example, an operation procedure for exchanging the power meter 10 uninterruptibly using the uninterruptible bypass connection support system 1. An example will be described.

  As shown in FIGS. 2 and 4, in step S <b> 1, the operator places markers 111, 121, 131, 141 at the connector mounting positions of the power source instrument cables 11, 12, 13 and the load instrument cables 14, 15, 16. , 151 and 161 are marked. At this time, nothing is displayed on the display unit 44 of the portable information terminal 40, or an image indicating a standby state is displayed.

  In step S <b> 2, the worker attaches the power supply side sensors 21, 22, and 23 to the downstream side of the markers 111, 121, and 131 in the power supply side instrument cables 11, 12, and 13. Further, the worker attaches load side sensors 24, 25, 26 to the upstream side of the markers 141, 151, 161 in the load side instrument cables 14, 15, 16. The power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26 start by securing operating power from the leakage flux of the instrument cables 11, 12, 13, 14, 15, 16.

  In step S3, the transmitter cables 211, 221, 231 of the power source side sensors 21, 22, 23 and the transmitter parts 241, 251, 261 of the load side sensors 24, 25, 26 are respectively attached to the instrument cables 11, 12, Current values and voltage values of 13, 14, 15, 16 are measured in a non-contact manner, and the measured values are transmitted to the receiving unit 41 wirelessly together with respective identification symbols such as “1S” and “1L”. The transmission units 211, 221, 211, 241, 251, and 261 may create a phase detection signal based on the measured current value and voltage value, and transmit the phase detection signal to the reception unit 41.

  In step S <b> 4, the receiving unit 41 transmits the received identification symbol, current value, and voltage value to the storage unit 42 and the phase detection signal, if any. In particular, the storage unit 42 stores the received current value as a pre-bypass current for each identification symbol.

  In step S5, the determination unit 43 reads the identification symbol and the current value / voltage value, if any, the phase detection signal from the storage unit 42, and identifies which identification symbol the power source side sensors 21, 22, 23 and which identification symbol load. It is determined whether the side sensors 24, 25, and 26 are in phase. The determination unit 43 uses, for example, the current value and voltage value transmitted from the transmission unit 211 of the power source side sensor 21, the current value / voltage value transmitted from the transmission unit 241 of the load side sensor 24, and the load side sensor 25. By comparing the current value / voltage value transmitted from the transmission unit 251 with the current value / voltage value transmitted from the transmission unit 261 of the load side sensor 26 in order, the power supply side instrument cable in which the power supply side sensor 21 is arranged 11 and the load side instrument cable in the same phase can be specified. The determination unit 43 stores the determined phase detection result in the storage unit.

  In step S <b> 6, the determination unit 43 transmits the phase detection result and the current value of each phase to the display unit 44.

  In step S7, the display unit 44 displays the phase detection result and the current value of each phase (pre-bypass current value).

  As shown in FIG. 5, for example, the power supply side sensor 21 and the load side sensor 24 are in phase, the power supply side sensor 22 and the load side sensor 25 are in phase, and the power supply side sensor 23 and the load side sensor 26 are in phase. If the determination unit 43 determines that they are in phase, the sensors “1S” and “1L”, “2S” and “2L”, “3S” and “3L” are in phase on the display unit 44, respectively. Display. Further, the completion of the phase detection may be displayed with characters such as “phase detection OK”.

  Further, as shown in FIG. 6, the display unit 44 displays the current values of each group in the same phase.

  As shown in FIGS. 2 and 7, in step S <b> 8, the operator confirms the display unit 44 and connects the in-phase instrument cables 11, 12, 13, 14, 15, and 16 with the bypass cables 31, 32, and 33. Connect by bypass. In this embodiment, for example, the power supply side instrument cable 11 to which the power supply side sensor 21 is attached and the load side instrument cable 14 to which the load side sensor 24 is attached are labeled “1S” attached to each sensor. "By using 1 L" as a mark, the bypass cable 31 is used for bypass connection. The power supply side connector 311 of the bypass cable 31 is attached in the vicinity of the marker 111, and the load side connector 312 is attached in the vicinity of the marker 141 so as to penetrate the covering of the instrument cables 11 and 14.

  The operator continues the label “2S” attached to each sensor with the power-side instrument cable 12 to which the power-side sensor 22 is attached and the load-side instrument cable 15 to which the load-side sensor 25 is attached. “2L” as a mark, and bypass connection is made with the bypass cable 32. The power supply side connector 321 of the bypass cable 32 is attached in the vicinity of the marker 121, and the load side connector 322 is attached through the covering of the instrument cables 12 and 15 in the vicinity of the marker 151.

  Finally, the operator attaches the label “3S” attached to each sensor to the power-side instrument cable 13 to which the power-side sensor 23 is attached and the load-side instrument cable 16 to which the load-side sensor 26 is attached. By using “3L” as a mark, the bypass cable 33 is used for bypass connection. The power supply side connector 331 of the bypass cable 33 is attached in the vicinity of the marker 131, and the load side connector 332 is attached in the vicinity of the marker 161 so as to penetrate the covering of the instrument cables 13 and 16.

  In this embodiment, three instrument cables are connected to each of the power supply side and the load side. However, any number of instrument cables may be connected, and the operator can set the same-phase set in the same manner. Check and make a bypass connection. Further, the order of connecting the bypass cables may be determined by the operator confirming the set of the in-phase instrument cables and performing the bypass connection, and the bypass connection may be performed from any phase of the instrument cable.

  As shown in FIG. 3, in step S <b> 9, the transmission units 211, 221, 231, 241, 251, and the power supply side instrument cables 11, 12, 13 and the load side instrument cables 14, 15, 16 are bypass-connected. 261 measures the current value of each instrument cable 11, 12, 13, 14, 15, 16 and transmits it to the receiver 41 together with the identification symbol of each sensor.

  In step S <b> 10, the reception unit 41 transmits the received identification symbol and current value, that is, the current value after bypass connection, to the storage unit 42.

  In step S11, the determination unit 43 determines from the storage unit 42 the value of the pre-bypass current corresponding to each identification symbol stored in the storage unit 42 in step S4 and each identification symbol stored in the storage unit 42 in step S10. Read the corresponding current value (divided current value). The determination unit 43 calculates a current value by comparing the pre-bypass current value stored in step S4 with the current value stored in step S10 for the current value corresponding to each read identification symbol. To do.

  In step S12, the determination unit 43 determines that the current value measured by the power supply side sensors 21, 22, 23 or the load side sensors 24, 25, 26 after the bypass connection is a predetermined ratio with respect to the pre-bypass current value. It is determined whether or not the value decreases. In this embodiment, for example, if the value of the shunt current is reduced to 50% or less with respect to the value of the current before bypass, it is determined that the shunt current can be normally performed. If the shunt current value is reduced to 50% or less with respect to the pre-bypass current value, the process proceeds to step S13. If the shunt current value is not reduced to 50% or less with respect to the pre-bypass current value, the process proceeds to step S15.

  In step S13, as shown in FIG. 7, the determination unit 43 transmits the determination result to the display unit 44, and the display unit 44 confirms that the current value of each phase and the divided current are less than or equal to a predetermined value. For example, it is displayed with characters such as “divided current OK”. The operator checks the display on the display unit 44.

  In step S <b> 14, the operator removes the instrument cables 11, 12, 13, 14, 15, 16 from the power meter 10 as shown in FIG. 8. When the power meter 10 and the instrument cables 11, 12, 13, 14, 15, 16 are separated, the leakage flux of the instrument cables 11, 12, 13, 14, 15, 16 disappears, and the power source side sensors 21, 22 are removed. , 23 and load side sensors 24, 25, 26 lose power. At this time, the display unit 44 displays that the current values measured by the power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26 are 0 A, 0 mA. The operator checks the display on the display unit 44.

  On the other hand, in step S15, the display unit 44 displays that the value of the divided current is not reduced to 50% or less with respect to the value of the current before bypass.

  In step S <b> 16, the determination unit 43 controls the alarm unit 45 to generate an alarm sound and alert the operator.

  In step S17, the operator confirms the bypass connection and reconnects correctly in the same manner as in step S8. Thereafter, the process returns to step S9.

  As described above, the uninterruptible bypass connection support system 1 for the power meter 10 cable includes the power supply side instrument cables 11, 12, 13 and the load side instrument cables 14, 15, 16 of the power meter 10, the bypass cable 31, This system supports bypass connection at 32 and 33.

  The uninterruptible bypass connection support system 1 according to the present invention includes power supply side sensors 21, 22, 23 that are arranged on the power supply side instrument cables 11, 12, 13 of the power meter 10 and measure current and voltage values, Load side sensor cables 24, 25, and 26 are disposed on the load side instrument cables 14, 15, and 16 of the meter 10 to measure current and voltage values. The power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26 include transmission units 211, 221, 231, 241, 251, 261 that wirelessly transmit measured current and voltage values.

  The uninterruptible bypass connection support system 1 further includes a reception unit 41 that wirelessly receives current and voltage values transmitted from the transmission units 211, 221, 231, 241, 251, 261, a determination unit 43, and a display unit. 44. The determination unit 43 includes the current and voltage values received by the reception unit 41 from the transmission units 211, 221, and 231 of the power supply side sensors 21, 22, and 23, and the transmission unit 41 includes the transmission units of the load side sensors 24, 25, and 26. By comparing the current and voltage values received from 241, 251, 261, the instrument cables 11, 12, 13 in which the power supply side sensors 21, 22, 23 are arranged and the load side sensors 24, 25, 26 are arranged It is determined whether the measured instrument cables 14, 15, 16 are in phase. The display unit 44 displays the result determined by the determination unit 43.

  Since the transmission units 211, 221, 231, 241, 251, 261 and the reception unit 41 of the power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26 transmit and receive current and voltage values wirelessly, The receiver 41 can be moved separately from the power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26. For example, by arranging the receiving unit 41 and the display unit 44 in the operator's personal digital assistant (PDA) 40, the operator can check the display unit 44 at hand.

  By using the uninterruptible bypass connection support system 1 having the above-described configuration, the operator can visually recognize the phase detection result displayed on the display unit 44, easily find the instrument cable of the in-phase set, and easily These instrument cables can be connected by bypass cables 31, 32, 33.

  By doing so, the burden on the operator when the instrument cables 11, 12, 13, 14, 15, 16 connected to the power meter 10 are removed from the power meter 10 is reduced, and the work is completed without a power failure. The uninterruptible bypass connection support system 1 for the cable of the power meter 10 that can be provided can be provided.

  The uninterruptible bypass connection support system 1 includes a plurality of power supply side sensors 21, 22, 23 and a plurality of load side sensors 24, 25, 26.

  By doing in this way, repetition of work can be reduced.

  Further, in the uninterruptible bypass connection support system 1, the power-side sensors 21, 22, 23 and the load-side sensors 24, 25, 26 can secure operating power by leakage magnetic flux from the instrument cable. It is configured.

  The power-side sensors 21, 22, 23 and the load-side sensors 24, 25, 26 ensure operating power by leakage magnetic flux from the instrument cable, so there is no need to provide a separate power source, and the entire system can be downsized. it can.

  The uninterruptible bypass connection support system 1 includes connectors 311, 312, 321, 322, 331, and 332 that are attached to both ends of the bypass cables 31, 32, and 33 and can penetrate the sheath of the instrument cable.

  Since the connectors 311, 312, 321, 322, 331, and 332 penetrate the sheath of the instrument cable, the operator can easily connect the bypass cables 31, 32, and 33 to the instrument cable.

  Moreover, it is preferable that the uninterruptible bypass connection support system 1 includes a storage unit 42 that stores a current value measured by the power supply side sensors 21, 22, 23 or the load side sensors 24, 25, 26 before the bypass connection. . The determination unit 43 reduces the current value measured by the power supply side sensors 21, 22, 23 or the load side sensors 24, 25, 26 after the bypass connection by a predetermined ratio with respect to the current value before bypass. It is configured to be able to determine whether or not.

  The uninterruptible bypass connection support system 1 preferably includes an alarm unit 45. The alarm unit 45 is configured to emit an alarm sound when the determination unit 43 determines that the divided current value has not decreased at a predetermined ratio with respect to the pre-bypass current value.

  The cable bypass connection method of the power meter 10 using the uninterruptible bypass connection support system 1 according to the first embodiment includes the following steps A to K in summary.

  Step A is a step in which the operator arranges the power supply side sensors 21, 22, and 23 on each of the plurality of power supply side instrument cables 11, 12, and 13. Step B is a step in which an operator places load side sensors 24, 25, and 26 on the load side instrument cables 14, 15, and 16, respectively. Step A and step B correspond to step S2 of this embodiment.

  Step C is a step in which the transmitters 211, 221, and 231 transmit the current and voltage values measured by the power supply side sensors 21, 22, and 23 and the receiver 41 receives them. Step D is a step in which the transmitters 241, 251, 261 transmit the current and voltage values measured by the load side sensors 24, 25, 26 and the receiver 41 receives them. Step C and step D correspond to step S3 of this embodiment. Step E is a step in which the storage unit 42 stores the current and voltage values received by the receiving unit 41 (step S4).

  Step F includes the current and voltage values received by the receiver 41 from the transmitters 211, 221, and 231 of the power supply side sensors 21, 22, 23, and the transmitter 241 of the load-side sensors 24, 25, and 26. , 251, 261, and the current value and the voltage value, the determination unit 43 is connected to the instrument cables 11, 12, 13 and the load side sensors 24, 25, in which the power supply side sensors 21, 22, 23 are arranged. This is a step of determining whether or not the instrument cables 14, 15 and 16 in which 26 is arranged are in phase (step S5). Step G is a step in which the display unit 44 displays the result determined by the determination unit 43 (step S7).

  In step H, the operator bypass-connects the power-side instrument cables 11, 12, 13 and the load-side instrument cables 14, 15, 16 determined by the determination unit 43 with the bypass cables 31, 32, 33. Step (step S8).

  Step I includes the value of the current measured by the power supply side sensors 21, 22, 23 arranged in the power supply side instrument cables 11, 12, 13 connected by bypass, or the load side instrument cable 14 bypassed. , 15, 16, the transmitters 211, 221, 231, 241, 251, 261 transmit at least one of the current values measured by the load side sensors 24, 25, 26, and the receiver 41 receives (Step S9). Note that, in the first embodiment, both the divided current measured by the power supply side sensors 21, 22, 23 and the divided current measured by the load side sensors 24, 25, 26 are transmitted and received.

  In step J, the value of the current received by the receiving unit 41 in step I is a predetermined ratio to the value of the current before bypass stored in the storage unit 42 in step E, that is, 50 in the first embodiment. This is a step (steps S11 and S12) in which the determination unit 43 determines whether or not the value has decreased to% or less.

  Step K is an alarm unit when it is determined in Step J that the value of the shunt current is not reduced to a predetermined ratio with respect to the value of the current before bypass, that is, 50% or less in the first embodiment. 45 is a step (step S16) which emits an alarm sound.

  By doing so, the burden on the operator when the instrument cables 11, 12, 13, 14, 15, 16 connected to the power meter 10 are removed from the power meter 10 is reduced, and the work is completed without a power failure. It is possible to provide a method for bypass connection of the cable of the power meter 10 that can be performed.

  In the first embodiment, the current value and the voltage value measured by the power supply side sensors 21, 22, 23 and the load side sensors 24, 25, 26 are stored in the storage unit 42 before and after bypassing. It is remembered. However, the uninterruptible bypass connection support system 1 may not include the storage unit 42 if it is not necessary to confirm that the reduction rate of the shunt current is equal to or less than the predetermined value. Moreover, even if it is a case where the uninterruptible bypass connection support system 1 is provided with the memory | storage part 42 and it confirms that the reduction rate of a shunt current is below a predetermined value, only the value of the electric current before bypass connection is memory | storage part 42 may be stored, and the value of the pre-bypass current stored in the storage unit 42 may be directly compared with the current value measured after the bypass connection to calculate the current reduction ratio.

  Further, in the first embodiment, the determination unit 43 determines the amount of current measured by the power supply side sensors 21, 22, 23 or the load side sensors 24, 25, 26 after the bypass connection with respect to the value of the current before bypass. Although it is configured so that it can be determined whether or not the value is decreasing at a predetermined ratio, the bypass connection support system may be configured as follows. That is, it is provided with a bypass cable current measuring instrument (not shown) arranged at the bypass cables 31, 32, and 33 to measure at least the current value, and the determination unit 43 determines the bypass cable current after bypass connection with respect to the pre-bypass current value. By determining whether the ratio of the current value measured by the measuring instrument is larger than the predetermined value, the instrument cables 11, 12, 13, It may be determined whether the value of the current flowing through 14, 15, 16 has decreased at a predetermined ratio. As the bypass cable current measuring device, for example, sensors having the same configuration as the power source side sensors 21, 22, 23 and the load side sensors 24, 25, 26 can be used.

(Second Embodiment)
In the uninterruptible bypass connection support system of the first embodiment, a plurality of power supply side power measuring instruments and a plurality of load side power measurement instruments have been described. However, the uninterruptible bypass connection support system of the present invention It is only necessary to provide one power meter and one load-side power meter. However, in this case, the operator needs to repeat the phase detection and the bypass connection by the number of sets of the instrument cables. Hereinafter, the uninterruptible bypass connection support system of 2nd Embodiment is demonstrated based on FIGS. Description of members denoted by the same reference numerals as in the first embodiment is omitted.

  As shown in FIG. 9, the uninterruptible bypass connection support system 2 of the second embodiment includes a power supply side sensor 51 as a power supply side power meter and a load side sensor 52 as a load side power meter. The power supply side sensor 51 includes a transmission unit 511, and the load side sensor 52 includes a transmission unit 521. A label displaying an identification symbol “0S” is affixed to the power supply side sensor 51, and the identification symbol is stored in a storage unit (not shown) of the power supply side sensor 51. A label displaying an identification symbol “0L” is affixed to the load side sensor 52, and the identification symbol is stored in a storage unit (not shown) of the load side sensor 52. Other configurations of the power supply side sensor 51 and the load side sensor 52 are the same as those of the power supply side sensor and the load side sensor of the first embodiment.

  The steps described below are basically the same as the steps shown in FIGS. In summary, the method for bypass connection of the cable of the power meter 10 using the uninterruptible bypass connection support system 2 includes the following steps AK.

  The worker places the power-side sensor 51 on, for example, the power-side instrument cable 11 (Step A), and places the load-side sensor 52 on, for example, the load-side instrument cable 16 (Step B).

  The power supply side sensor 51 measures the current and voltage values of the power supply side instrument cable 11, the transmission unit 511 transmits these values, and the reception unit 41 receives them (step C). Moreover, the load side sensor 52 measures the value of the electric current and voltage of the load side instrument cable 16, the transmission part 511 transmits those values, and the receiving part 41 receives (step D). The receiving unit 41 transmits the received current and voltage values to the storage unit 42, and the storage unit 42 stores these values (step E).

  The determination unit 43 compares the current and voltage values received by the reception unit 41 from the transmission unit 511 of the power source side sensor 51 with the current and voltage values received by the reception unit 41 from the transmission unit 521 of the load side sensor 52. Thus, it is determined whether or not the power-side instrument cable 11 in which the power-side sensor 51 is disposed and the load-side instrument cable 16 in which the load-side sensor 52 is disposed are in phase (step F). The display unit 44 displays the result determined by the determination unit 43, for example, the result that it is not in phase (step G). The operator confirms the result displayed on the display unit 44 in step G.

  As shown in FIG. 9, for example, when a result indicating that they are not in phase is displayed on the display unit 44, the worker rearranges the load side sensor 52 on another load side instrument cable 14 (step B). ). The power supply side sensor 51 may be rearranged in another power supply side instrument cable. Steps C to G are repeated.

  As shown in FIG. 10, in step F, the determination unit 43 determines that the power-side instrument cable 11 in which the power-side sensor 51 is disposed and the load-side instrument cable 14 in which the load-side sensor 52 is disposed are in phase. In this case, the result of being in phase is displayed on the display unit 44 (step G). The operator confirms the result displayed on the display unit 44.

  The worker connects the power-side instrument cable 11 in which the power-side sensor 51 is disposed and the load-side instrument cable 14 in which the load-side sensor 52 is disposed with the bypass cable 31 (Step H).

  The amount of current measured by the power supply side sensor 51 arranged on the power supply side instrument cable 11 connected by bypass, or the amount measured by the load side sensor 52 arranged on the load side instrument cable 14 connected by bypass. At least one of the current values is transmitted by the transmission unit 511 or the transmission unit 521 and received by the reception unit 41 (step I).

  The determination unit 43 reduces the current value received by the receiving unit 41 in step I to a predetermined ratio, for example, 50% or less, with respect to the pre-bypass current value stored in the storage unit 42 in step E. It is determined whether or not (Step J).

  The alarm unit 45 emits an alarm sound when it is determined in step J that the value of the divided current has not decreased to a predetermined ratio, for example, 50% or less, relative to the value of the current before bypass (step K). .

  As shown in FIG. 11, the value of the divided current determined in step L is displayed on the display unit 44. The operator confirms the display on the display unit 44 and removes the power supply side sensor 51 and the load side sensor 52 from the instrument cables 11 and 14 if the divided current is equal to or less than a predetermined value.

  The operator attaches the power-side sensor 51 and the load-side sensor 52 to another set of instrument cables, and repeats the above steps A to K. After all instrument cables are bypassed, the operator removes the power meter 10 from the instrument cables 11, 12, 13, 14, 15, 16.

  By doing so, the burden on the operator when the instrument cables 11, 12, 13, 14, 15, 16 connected to the power meter 10 are removed from the power meter 10 is reduced, and the work is completed without a power failure. It is possible to provide a method for bypass connection of the cable of the power meter 10 that can be performed.

  The embodiment disclosed above should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

  1, 2: Uninterruptible bypass connection support system, 10: Power meter, 11, 12, 13: Power source side instrument cable, 14, 15, 16: Load side instrument cable, 21, 22, 23, 51: Power source side sensor, 24, 25, 26, 52: load side sensor, 211, 221, 231, 241, 251, 261, 511, 521: transmission unit, 31, 32, 33: bypass cable, 311, 321, 331: power supply side connector, 312, 322, 332: load side connector, 40: portable information terminal, 41: receiving unit, 42: storage unit, 43: determination unit, 44: display unit, 45: alarm unit.

Claims (9)

A system that supports bypass connection of in-phase instrument cables on the power supply side and load side of the power measurement device with a bypass cable,
A non-contact power meter on the power source side, which is arranged on an instrument cable on the power source side of the power measuring device and measures current and voltage values;
A load-side non-contact power meter that measures the current and voltage values arranged on the load-side meter cable of the power measuring device,
The power-source-side non-contact power meter and the load-side non-contact power meter include a transmitter that wirelessly transmits the measured current and voltage values,
The bypass connection support system further includes a receiving unit that wirelessly receives the current and voltage values transmitted from the transmitting unit,
The current and voltage values received by the receiver from the transmitter of the power-source-side non-contact power meter, and the current and voltage values received by the receiver from the transmitter of the load-side non-contact power meter. And a determination unit that determines whether or not the instrument cable in which the power supply-side non-contact power meter is disposed and the instrument cable in which the load-side non-contact power meter is disposed are in phase with each other ,
A cable bypass connection support system of a power measuring device, comprising: a display unit configured to display a result determined by the determination unit.   The bypass connection support system according to claim 1, comprising a plurality of power source side non-contact power measuring instruments and a plurality of load side non-contact power measuring instruments.   The power source side non-contact power measuring instrument and the load side non-contact power measuring instrument are configured to be able to ensure operating power by leakage magnetic flux from an instrument cable. 2. The bypass connection support system according to 2.   The bypass connection support system according to any one of claims 1 to 3, further comprising a connector that is attached to both ends of the bypass cable and can penetrate the sheath of the instrument cable. A storage unit for storing a current value measured by the power-source-side non-contact power measuring instrument or the load-side non-contact power measuring instrument before bypass connection as a pre-bypass current value;
The said determination part is comprised so that it may determine whether the value of the part electric current which flows through an instrument cable after bypass connection is reducing with the predetermined | prescribed ratio with respect to the value of the said electric current before bypass. The bypass connection support system according to any one of claims 1 to 4.   The determination unit reduces a current value measured by the power-source-side non-contact power meter or the load-side non-contact power meter after bypass connection at a predetermined ratio with respect to the pre-bypass current value. It is configured to determine whether or not the value of the current flowing through the instrument cable after the bypass connection is decreased at a predetermined ratio with respect to the value of the current before bypass by determining whether or not The bypass connection support system according to claim 5. It has a bypass cable current measuring instrument that is placed in the bypass cable and measures at least the current value.
The determination unit is configured to determine a value of the current before bypass based on whether a ratio of a current value measured by the bypass cable current measuring instrument after bypass connection to a value of the current before bypass is greater than a predetermined value. On the other hand, the bypass connection support system according to claim 5, wherein the bypass connection support system is configured to determine whether or not a value of a current flowing through the instrument cable after the bypass connection is decreased at a predetermined ratio. Equipped with an alarm unit,
The alarm unit is configured to emit an alarm sound when the determination unit determines that the value of the divided current does not decrease at a predetermined ratio with respect to the value of the current before bypass. The bypass connection support system according to any one of claims 5 to 7. Step A in which an operator arranges the power source side non-contact power meter in each of a plurality of power source side instrument cables;
Step B in which an operator places the load-side non-contact power meter in each of a plurality of load-side instrument cables;
Step C in which the transmitter transmits the current and voltage values measured by the power-source-side non-contact power meter, and the receiver receives the values;
Step D in which the transmitter transmits the current and voltage values measured by the load-side non-contact power meter, and the receiver receives the values;
Step E in which the storage unit stores the value of the current received by the receiving unit as a current before bypass,
The current and voltage values received by the receiver from the transmitter of the power-source-side non-contact power meter, and the current and voltage values received by the receiver from the transmitter of the load-side non-contact power meter. The determination unit determines whether or not the instrument cable in which the power-side non-contact power meter is disposed and the instrument cable in which the load-side non-contact power meter is disposed are in phase. Step F to
Step G in which the display unit displays the result determined by the determination unit;
Step H in which the operator bypasses the power-side instrument cable and the load-side instrument cable determined to be in phase by the determination unit with a bypass cable;
The value of the divided current measured by the power source side non-contact power measuring instrument arranged on the power source side instrument cable connected by bypass, or the load side non-contact power arranged on the load side instrument cable bypassed Step I in which the transmitting unit transmits at least one of the current values measured by the measuring instrument and the receiving unit receives,
The determination unit determines whether or not the current value received by the receiving unit in Step I is decreased at a predetermined ratio with respect to the pre-bypass current value stored in the storage unit in Step E. Determining step J;
A step K in which the alarm unit emits an alarm sound when it is determined in the step J that the value of the divided current has not decreased at a predetermined ratio with respect to the value of the current before bypass. Item 9. A method for bypass connection of a cable of a power measuring device using the bypass connection support system according to Item 8.

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