JP6340892B2 - Switching device and power supply system - Google Patents

Switching device and power supply system Download PDF

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JP6340892B2
JP6340892B2 JP2014088615A JP2014088615A JP6340892B2 JP 6340892 B2 JP6340892 B2 JP 6340892B2 JP 2014088615 A JP2014088615 A JP 2014088615A JP 2014088615 A JP2014088615 A JP 2014088615A JP 6340892 B2 JP6340892 B2 JP 6340892B2
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power
switching
switch
load
switching control
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JP2015208167A (en
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幹彦 和田
幹彦 和田
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オムロン株式会社
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Description

  The present invention relates to a switching device and a power supply system.
  When the electric power company (electricity supplier) supplies electricity to consumers such as private homes, the Electricity Business Act states that it is necessary to investigate whether the electric structures such as the electric circuit conform to the technical standards. It has been established.
For example, in an individual house, the investigator visits once every four years, turns off the MCB (Miniature Circuit Breaker) on the distribution board, cuts off the power supply, and connects an insulation resistance meter to the electric circuit in the house. Then, the insulation resistance value between the electric circuit and the ground is measured.
  In this way, the measurement of ground insulation resistance is performed by shutting off the power supply and powering off the target circuit, but with the widespread use of solar cell systems and electric vehicles, it is stored in solar cell systems and electric vehicle storage batteries at the time of power outages. There has also been proposed a system for automatically switching electric circuits so as to supply electric power. In patent document 1 (Unexamined-Japanese-Patent No. 2013-183549), the electric power system which switches an electric circuit so that the electric power from a storage battery may be supplied to a load according to a condition is proposed.
  For example, in a system having a solar battery and a storage battery of Patent Document 1, when the power supply is cut off in order to measure the insulation resistance, the electric circuit is automatically switched to supply power from the solar battery or the storage battery. The power circuit could not be measured.
JP 2013-183549 A Japanese Patent No. 3519899
  The present invention has been invented in view of the above prior art, and its purpose is to measure the insulation resistance of an electric circuit with higher accuracy in equipment having means for switching a power supply path (electric circuit) in the event of a power failure. It is to provide technology that can.
In order to solve the above problems, the switching device of the present invention provides:
A switching device that switches to supply power from one of the first power system or the second power system to the load,
A switching means in which an input side is connected to the first power system and the second power system, and an output side is connected to the load;
Switching control for controlling to switch the input of the switching means to the second power system and to supply the power from the second power system to the load at the time of a power failure of the first power system Means,
Switching prohibiting means for prohibiting switching of the input of the switching means to the second power system at the time of inspection of the first power system;
Is provided.
The switching device is
In the first power system, a detection unit is provided upstream from the section to be inspected and the section to be inspected, power is not supplied to the section to be inspected, and power is upstream from the section to be inspected. When the supply is detected, the switching prohibiting unit may determine that the inspection is being performed and prohibit switching of the switching unit.
The switching device is
When a signal associated with the inspection of the first power system is received, the switching prohibiting unit may determine that the inspection is being performed and prohibit switching of the switching unit.
The switching device is
When the inspection switch is switched from the normal state to the inspection state, the switching prohibiting unit may determine that the inspection is being performed and prohibit the switching of the switching unit.
The switching device is
In the inspection, when it is detected that the power supply upstream from the section to be inspected is stopped, an informing means for informing that a power failure has occurred may be provided.
In order to solve the above problems, the power supply system of the present invention is:
The switching device;
A power supply for supplying power of the second power system;
Is provided.
  Note that means for solving the above-described problems can be used in combination as much as possible.
  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to measure the insulation resistance of an electric circuit more accurately in the installation which has a means to switch an electric power supply path (electric circuit) at the time of a power failure.
FIG. 1 is a diagram illustrating a schematic configuration of a power supply system according to the first embodiment. FIG. 2 is a diagram showing a normal electric circuit. FIG. 3 is a diagram illustrating an electric circuit during a power failure. FIG. 4 is a diagram showing a system configuration diagram of the switching control circuit. FIG. 5 is a diagram illustrating a method for measuring an insulation resistance value. FIG. 6 is a diagram showing a case where the electric voltage (line voltage) supplied in a single-phase two-wire system is 100V. FIG. 7 is a diagram illustrating a case where the electric voltage (line voltage) supplied in a single-phase three-wire system is 100V or 200V. FIG. 8 is a diagram showing a case where the electric voltage (line voltage) supplied by the three-phase three-wire system is 200V. FIG. 9 is an explanatory diagram of the switching control method according to the first embodiment. FIG. 10 is a diagram illustrating an electric circuit when switching is prohibited. FIG. 11 is a diagram illustrating a schematic configuration of a power supply system according to the second embodiment. FIG. 12 is an explanatory diagram of the switching control method according to the second embodiment. FIG. 13 is a diagram illustrating a schematic configuration of a power supply system according to the third embodiment. FIG. 14 is an explanatory diagram of a switching control method according to the third embodiment. FIG. 15 is a diagram illustrating a schematic configuration of a power supply system according to the fourth embodiment. FIG. 16 is an explanatory diagram of a switching control method according to the fourth embodiment. FIG. 17 is an explanatory diagram of the switching control method according to the fifth embodiment.
  DETAILED DESCRIPTION Exemplary embodiments for carrying out the present invention will be described in detail below with reference to the drawings. In the following embodiments, a solar cell system will be described as an example of the second power system, but the application target of the present invention is not limited to the solar cell system.
<Example 1>
"System configuration"
FIG. 1 shows a schematic configuration of a power supply system 10 according to the first embodiment. The power supply system 10 is a facility that supplies power to a power load (hereinafter also simply referred to as a load) in a building such as a house, a commercial facility, a factory building, or a store. Hereinafter, a case where the power supply system 10 is built in a house will be described as an example. The power system 10 includes a first power system 1 that supplies power received from an electric power company (electricity supplier) to a load, and a second power system that supplies power from a power source different from the first power system to the load. And an electric power system 2. That is, the power supply system 10 is an electric work that uses electricity supplied by an electric power company (electricity supplier).
  The first electric power system 1 includes a distribution board 3 to which electric power is input from the facility 11 on the electric power company side, and an electric circuit 61 for supplying electric power to the load side. The second power system 2 includes a solar unit 22 and a storage battery unit 21. The solar unit 22 is provided with a solar battery 222 that generates power using solar energy and a PV power conditioner 221, and the output of the solar battery 222 is connected to the distribution board 3 via the PV power conditioner 221. It is connected to the storage battery unit 21.
  The storage battery unit 21 includes a storage battery 28, a storage battery power conditioner 27, a switching device 23, a switch 241, a switching control circuit 242, a reverse power relay (RPR) 26, and an earth leakage circuit breaker (ELB) 25. Yes.
  The storage battery 28 is a secondary battery of an arbitrary type such as a lithium ion battery or a NaS battery (sodium-sulfur battery), and stores the power received from the first power system 1 or the power generated by the solar unit 22. .
  The storage battery power conditioner 27 is connected to the storage battery 28 and controls charging / discharging of the storage battery 28. The storage battery power conditioner 27 is connected to the distribution board 3 via the switch 241, the reverse power relay 26, and the leakage breaker 25. Furthermore, the storage battery power conditioner 27 is connected to the solar light unit 22 via the switch 241.
  In the switch 241, the first power system 1 and the solar unit 22 are connected to the input side, and the storage battery power conditioner 27 is connected to the output side. The input of the switch 241 is switched by the switching control circuit 242 to switch the electric circuit so that the power from the first power system 1 or the power from the solar unit 22 is alternatively output to the storage battery power conditioner 27. .
  The reverse power relay (RPR) 26 opens the electric circuit at the time of a power failure of the first power system 1 and interrupts the reverse power flow from the storage battery 28 to the first power system 1.
  The earth leakage breaker 25 mainly detects the leakage current, and when the leakage current is generated in the storage battery unit 21, the electric circuit is opened to cut off the electric power.
The switching device 23 is connected to the first power system 1 and the second power system 2 on the input side, and the load system 4 such as an electric path 62 for distributing power to the load 51 on the output side, and the distribution board 41 for important loads. Is connected. The switching device 23 switches the electric circuit so that the power from the first power system 1 and the power from the second power system 2 are alternatively output to the load 51.
The distribution board 3 includes a main switch (MCB: Miniature Circuit Breaker) 31 having a lead-in wire 65 connected to the input side and a main line 66 connected to the output side, and each system branched from the main line 66. Circuit breakers 32, 33 and 34 for protection are provided.
  The main switch 31 is in a state in which the main line 66 is closed in a normal state, and the electric power received from the facility 11 on the power company side through the service line 65 is passed to the main line 66, and the downstream side of the main switch 31, That is, when an overload, a short circuit, or a ground fault occurs in an indoor electric circuit, the main line 66 is opened to cut off the power supply to the main line 66. The main switch 31 may be a so-called ampere breaker that cuts off when the current flowing through the main line 66 exceeds a predetermined value.
  The earth leakage breaker (ELB) 32 is a circuit breaker having a function of cutting off electric power according to the leakage current in the system after the earth leakage breaker 32, in this example, the solar unit 22, and for example, in the solar unit 22 In case of leakage current, the circuit is opened to cut off the power.
  The MCB 33 opens the electric circuit and shuts off the power supply when an overload or short circuit occurs in the system after the MCB 33, in this example, the storage battery unit 21.
  In the system after the circuit breaker 34, in this example, the load system 4 and the load 51, the circuit breaker 34 opens an electric circuit and interrupts power supply when an overload or a short circuit occurs.
  The circuit breaker 35 is connected to a load 52 via an electric circuit 67 on the output side. When an overload or a short circuit occurs in the electric circuit 67 and the load 52, the circuit breaker 35 is opened to interrupt power supply. The circuit breaker 35 and the electric circuit 67 are provided in a plurality of systems in accordance with an assumed load such as an electric lamp, an air conditioner, and other loads used via an outlet.
  The important load distribution board 41 is connected to the switching device 23 via the electric circuit 62, branches the electric power input from the switching device 23 into a plurality of electric circuits 68 for distributing the load 51, and breaks a breaker in each electric circuit. 42 is provided.
<Normal power control>
When the 1st electric power grid | system 1 is operate | moving normally, the solar power unit 22 will be in the interconnection operation state linked | linked with the 1st electric power grid | system 1. FIG. In this case, the PV power conditioner 221 converts the output from the solar cell 222 from direct current to alternating current and inputs it to the distribution board 3, and the circuit breaker 34, the switching device 23, and the important load for the distribution board 3. AC power is output to the load 51 via the distribution board 41. The PV power conditioner 221 outputs AC power to the load 52 via the circuit breaker 35 of the distribution board 3.
  Similarly, the output of the storage battery 28 is converted from direct current to alternating current by the storage battery power conditioner 27, and is input to the distribution board 3 through the electric circuit 69, the reverse power relay 26, and the leakage breaker 25. Are supplied to loads 51 and 52 through circuit breakers 34 and 35. Thereby, when the power consumption of the loads 51 and 52 is larger than the power generated by the solar battery 222, the power discharged from the storage battery 28 is supplemented to satisfy the power consumption of the loads 51 and 52. For example, since the output of the amount of power generated by the solar battery 2 fluctuates due to the influence of the weather, the power supply from the storage battery 5 suppresses fluctuations in the power supply as the second power system 2 combined with the solar battery 222. It has become.
When the output power from the second power system 2 is less than the power consumption of the loads 51 and 52, the shortage may be automatically supplied from the first power system 1 to the loads 51 and 52. . Conversely, when the output power from the PV power conditioner 221 is greater than the power consumption of the loads 51 and 52, the surplus may be automatically supplied to the first power system 1.
  In addition, when the power consumption of the loads 51 and 52 is less than the power generated by the solar battery 222 and the amount of charge of the storage battery 28 is insufficient, the power generated by the solar battery 222 is not supplied to the loads 51 and 52. Is supplied to the storage battery 28 through the MCB 33 of the distribution board 3, the leakage breaker 25, the reverse power relay 26, the switch 241, and the storage battery power conditioner 27 for charging the storage battery 28. In addition, when the amount of charge of the storage battery 28 is insufficient and the amount of power generated by the solar battery 2 that is not supplied to the loads 51 and 52 is insufficient as the power for charging the storage battery 28 The electric power may be supplied to the storage battery 28 by supplementing with the electric power of the first electric power system 1.
  The control of the charge / discharge amount from the storage battery 28 is realized by a microprocessor (not shown) included in the storage battery power conditioner 27 and a program executed on the microprocessor.
《Power control during power failure》
When the first power system 1 fails, the second power system 2 performs a self-sustained operation of the solar unit 22 and outputs the output from the solar battery 222 from the PV power conditioner 221 via the switch 241 of the storage battery unit 21. To the storage battery power conditioner 27. The switching device 23 of the storage battery unit 21 switches the input from the first power system 1 to the second power system 2 and supplies the power from the storage battery power conditioner 27 to the load 51 via the load system 4. To do.
  FIG. 2 is a diagram illustrating an electric circuit during normal operation, and FIG. 3 is a diagram illustrating an electric circuit during a power failure. As shown in FIGS. 2 and 3, the switch 241 includes a terminal 2 f that receives power from the distribution board 3, a terminal 2 h that receives power from the PV power conditioner 221, and a storage battery power conditioner. And a terminal 2g that outputs the signal to the terminal 27. The switching control circuit 242 controls the switch 241 in accordance with the presence or absence of power supplied from the first power system 1 by a detection unit (not shown). For example, the switching control circuit 242 connects the terminal 2f and the terminal 2g of the switch 241, and outputs power from the distribution board 3 to the storage battery power conditioner 27, or connects the terminal 2h and the terminal 2g. The power from the solar unit 22 is switched to the storage battery power conditioner 27.
  The switching device 23 includes a switch (switching unit) 231, a switching control circuit (switching control unit) 232, and sensors 233 and 234. The switch 231 has a terminal 2a to which power from the distribution board 3 is input, a terminal 2c to which power from the storage battery power conditioner 27 is input, and a terminal 2b to output to the load system 4. . The switching control circuit 232 controls the switch 231 according to the presence / absence of power supplied from the first power system 1 by the sensor 234. For example, the switching control circuit 232 connects the terminal 2a and the terminal 2b of the switch 231 and outputs the power from the distribution board 3 to the load system 4, or connects the terminal 2c and the terminal 2b to store the storage battery. Whether the power from the power conditioner 27 is output to the load system 4 is switched. The sensor 233 detects the presence or absence of electric power on the input side of the MCB 31 (FIG. 1), that is, the lead-in port 65. The sensor 234 detects the presence or absence of electric power on the output side of the MCB 31 (FIG. 1), that is, the main trunk line 66.
FIG. 4 shows a system configuration diagram of the switching control circuit 232. The switching control circuit 232 includes a CPU 76, a ROM 77, a RAM 78, a drive unit 79, and an I / O interface 75. I
Sensors 233 and 234 are connected to the / O interface 75, and a detection value, that is, presence / absence of electric power in the electric paths 65 and 66 is input.
  The CPU 76 reads out the control program stored in the ROM 77 to the RAM 78 as appropriate and executes it, and causes the drive unit 79 to switch the switch 231 based on the input from the I / O interface 75.
  When the first power system 1 is operating normally, as shown in FIG. 2, the switching control circuit 242 controls the switch 241 to connect the terminal 2 f and the terminal 2 g, and from the distribution board 3. Is output to the storage battery power conditioner 27. In addition, the switching control circuit 232 of the switching device 23 controls the switch 231 to connect the terminals 2 a and 2 b to output the power from the distribution board 3 to the load system 4.
  On the other hand, when the first power system 1 has a power failure, as shown in FIG. 3, the switching control circuit 242 controls the switch 241 to connect the terminal 2 h and the terminal 2 g and Is output to the storage battery power conditioner 27. The switching control circuit 232 of the switching device 23 controls the switch 231 to connect the terminal 2c and the terminal 2b, and outputs the electric power from the storage battery power conditioner 27 to the load system 4.
  When the power generated by the solar battery 222 is larger than the power consumed by the load 51 when the first power system 1 is out of power, the storage battery power conditioner 27 is configured to store the power generated by the solar battery 222. Of these, the portion not supplied to the load 51 is supplied to the storage battery 28 for charging.
  When the power generated by the solar battery 222 is less than the power consumed by the load 51, the storage battery power conditioner 27 is used when the power generated by the solar battery 222 is insufficient as the power supplied to the load 51. Is supplemented by the output of the storage battery 28 and supplied to the load 51. That is, when there is no power generated by the solar battery 222 such as at night, the power consumption of the load 51 is covered by the output of the storage battery 28.
  As described above, when the first power system 1 is operating normally, power is supplied to the loads 51 and 52 by the linked operation of the first power system 1 and the second power system 2. When the first power system 1 fails, power is supplied from the second power system 2 to the load 51. That is, the load 51 connected to the important load distribution board 41 can be supplied with power even during a power failure. However, when there is no power generated by the solar battery 222 such as at night or in bad weather, only the electric power charged in the storage battery 28 is supplied, and the supply amount is limited. An important load such as a device that is in trouble when power supply is interrupted is selected and connected to the important load distribution board 41.
<Measurement of insulation resistance>
Next, a method for measuring (inspecting) the insulation resistance will be described with reference to FIGS. FIG. 5 is a diagram illustrating a method for measuring an insulation resistance value. When measuring the insulation resistance value, as shown in FIG. 5, first, the MCB 31 connected to the facility 11 of the electric power company is turned off through the service line 65, that is, the electric circuit is opened, and power is supplied to the main line 66. Shut off.
  Then, the probe on the ground side of the insulation resistance meter 70 is connected to the ground line 71, the other probe is connected to the main line 66, a predetermined DC voltage of the main line 66 is applied, and the resistance value at this time is measured. .
FIG. 6 is a diagram showing a case where the electric voltage (line voltage) supplied by the single-phase two-wire system is 100 V, and FIG. 7 shows the electric voltage (line voltage) supplied by the single-phase three-wire system. It is a figure which shows the case where it is set as 100V or 200V. Moreover, FIG. 8 is a figure which shows the case where the electric voltage (line voltage) supplied by a three-phase three-wire system is 200V.
  As shown in FIGS. 6 and 7, when the line voltage is 300 V or less and the ground voltage is 150 V or less, the insulation resistance value is 0.1 MΩ or more. Further, as shown in FIG. 8, when the line voltage is 300 V or less and the ground voltage exceeds 150 V, the insulation resistance value is 0.2 MΩ or more.
<Switching control when measuring insulation resistance>
As shown in FIG. 5, when measuring the insulation resistance, the MCB 31 is turned off to cut off the supplied power. In the power supply system 10 of the present embodiment, when the first power system 1 fails, the switching device 23 automatically switches the input from the first power system 1 to the second power system 2, and the second power system 1 It has a function of supplying power from the power system 2 to the load 51. For this reason, the switching control circuit 232 determines that the power failure of the first power system 1 is caused when the MCB 31 is turned off at the time of insulation resistance measurement (inspection) and the power to the main line 66 is cut off. When the input is switched to the second power system 2, the load system 4 is disconnected from the first power system 1, and the insulation resistance of the load system 4 cannot be measured.
  Therefore, the switching control circuit 232 of the present embodiment compares the detection values of the sensors 233 and 234 to determine whether or not the insulation resistance is being measured. If the measurement is being made, the switch 231 is input to the second power system. Switching to 2 is prohibited.
  FIG. 9 is an explanatory diagram of this switching control method, which is executed by the CPU 76 of the switching control circuit 232 in accordance with a program read from the ROM 77.
  The switching control circuit 232 periodically executes the process of FIG. 9, and first detects the presence or absence of supply power in the main line 66 by the sensor 234 (step S <b> 10) and determines whether or not there is supply power (step S <b> 10). S20).
  When the switching control circuit 232 determines in step S20 that there is no power supplied to the main line 66 (step S20, No), the sensor 233 detects the presence / absence of power supplied to the lead-in port 65 (step S30).
Next, the switching control circuit 232 determines whether or not there is power supplied through the service port 65 (
Step S40), when it is determined that there is no power supply (No at Step S40), the switch 2
The input of 31 is switched to the second power system (step S50), and the process of FIG. On the other hand, if the switching control circuit 232 determines in step S40 that there is power supplied to the service inlet 65 (step S40, Yes), the switching control circuit 232 prohibits switching the input of the switch 231 to the second power system ( Step S60), the process of FIG. 9 is terminated. That is, the switching control circuit 2
32, when there is no supply power in the service line 65 or the main line 66, it is determined that a power failure has occurred and the input of the switch 231 is set as the second power system.
  On the other hand, the switching control circuit 232 determines that the MCB 31 is turned off for the measurement of the insulation resistance when the supply power is supplied to the lead-in port 65 and there is no supply power to the main line 66, and the input of the switch 231 is changed to the second input. It is prohibited to switch to other power systems. FIG. 10 is a diagram illustrating an electric circuit when this switching is prohibited. As shown in FIG. 10, when the MCB 31 is turned off, the switching control circuit 242 controls the switch 241 to connect the terminal 2 h and the terminal 2 g to use the power from the solar unit 22 as a storage battery power conditioner. To 27. Further, the switching control circuit 232 of the switching device 23 controls the switch 231 so that the terminals 2a and 2b are connected.
When the measurement of the insulation resistance is completed and the MCB 31 is turned on, or when the first power system is restored from the power failure, the switching control circuit 232 has power supplied to the main line 66 in step S20. And prohibition of switching of the switch 231 is released (step S7).
0). If switching of the switch 231 is not prohibited, step S70 may be skipped.
  In addition, the switching control circuit 232 controls the switch 231 so that the terminal 2a and the terminal 2b are connected (step S80). If the terminal 2a and the terminal 2b are connected, step S80 may be skipped.
  As described above, according to the first embodiment, the presence / absence of supply power on the upstream side and the downstream side of the MCB 31 to be turned off at the time of measuring the insulation resistance is detected, and power is not supplied to the downstream side, that is, the section to be inspected. When it is detected that electric power is supplied to the upstream side of the section to be inspected, switching of the electric path for supplying electric power to the load system 4 is prohibited. For this reason, in the power supply system 10 having a function of automatically switching a power path for supplying power to the load system 4 at the time of a power failure of the first power system, the load system 4 remains in the first power system even if the MCB 31 is turned off. Insulation resistance can be properly checked because it is not disconnected from the cable.
<Example 2>
In the first embodiment described above, the switching values of the switching devices are controlled by comparing the detection values of the sensors 233 and 234. However, in the second embodiment, switching of the switching devices is controlled based on a signal from the MCB 31. . Since the other configuration is the same as that of the first embodiment, the same elements are denoted by the same reference numerals and the description thereof is omitted.
  FIG. 11 shows a schematic configuration of the power supply system 10 according to the second embodiment. The MCB 31A of the second embodiment includes a notification unit 311 that notifies the switching control circuit 232 of the switching device 23 of the on / off state. For example, when the insulation resistance is measured and the MCB 31A is turned off, an electrical signal indicating that the notification unit 311 is turned off is transmitted to the switching control circuit 232, and based on this, the switching control circuit 232 detects the insulation resistance. Switching of the switch 231 is prohibited as the measurement is performed. That is, the notification unit 311 is means for notifying the switching control circuit 232 of a signal associated with the inspection of the first power system. The electrical path through which the notification unit 311 transmits an electrical signal to the switching control circuit 232 may be wired or wireless. In addition, the notification unit 311 is not limited to the one that actively transmits an electrical signal indicating the on / off state to the switching control circuit 232, but may be passive depending on the presence or absence of conduction by a relay, a switch, or the like, or a change in resistance value by a variable resistor. It may be shown in In this case, the switching control circuit 232 can detect the on / off state of the MCB 31 </ b> A by detecting the conduction state and the resistance value of the notification unit 311.
  The sensor 235 detects the presence or absence of power supplied via the circuit breaker 34 of the distribution board 3 and inputs the detection result to the switching control circuit 232 via the I / O interface 75. Based on the detection result of the sensor 235, the switching control circuit 232 determines that there is a power failure if there is no power supplied from the distribution board 3 and switches the input of the switching device 23 to the second power system 2.
FIG. 12 is an explanatory diagram of the switching control method according to the second embodiment. The switching control circuit 232 periodically executes the process of FIG. 12, first detects the on / off state of the MCB 31A based on the notification of the notification unit 311 (step S110), and determines whether the MCB 31A is off (step S12).
0).
If it is determined in step S120 that the MCB 31A is off (step S120, Yes), the switching control circuit 232 prohibits switching the input of the switch 231 to the second power system (step S130). If the MCB 31A is determined to be on (No at Step S120), the switching control circuit 232 cancels the prohibition of switching of the switch 231 (Step S140). If switching of the switch 231 is not prohibited, step S140 may be skipped.
  Next, the switching control circuit 232 determines whether or not there is power supplied from the first power system 1 based on the detection result of the sensor 235 (step S150). If there is no power supplied from the first power system 1 (No at Step S150), the switching control circuit 232 determines whether switching of the switch 231 is prohibited (Step S160). When switching of the switch 231 is not prohibited (No at Step S160), the switching control circuit 232 determines that a power failure has occurred and sets the input of the switch 231 to the second power system (Step S170), and ends the process.
In addition, when switching of the switch 231 is prohibited (Yes in step S160), the switching control circuit 232 ends the process without switching the input of the switch 231 to the second power system.
  Thus, according to the present Example 2, switching of the electric circuit which supplies electric power to the load system 4 is prohibited based on the signal accompanying the inspection of the first power system. For this reason, in the power supply system 10 having a function of automatically switching a power path for supplying power to the load system 4 at the time of a power failure of the first power system, the load system 4 remains in the first power system even if the MCB 31 is turned off. Insulation resistance can be properly checked because it is not disconnected from the cable.
<Example 3>
In the above-described second embodiment, switching of the switching device is controlled based on the signal from the MCB 31. However, in the third embodiment, switching of the switching device is controlled based on the signal from the insulation resistance meter 70. Since the other configuration is the same as that of the above-described second embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.
  FIG. 13 is a diagram illustrating a schematic configuration of the power supply system 10 according to the third embodiment. The sensor 236 is connected to the electric circuit 61, detects a signal from the insulation resistance meter 70, and inputs the detection result to the switching control circuit 232 via the I / O interface 75. The sensor 236 of this example detects this as a signal from the insulation resistance meter 70 when a DC voltage of a predetermined value (for example, 200 V) or more is applied to the electric circuit 61. However, the configuration is not limited thereto, and the insulation resistance meter 70 may transmit a predetermined electrical signal via the main line 66 or the electrical path 61 and the sensor 236 may detect this electrical signal.
  FIG. 14 is an explanatory diagram of the switching control method according to the third embodiment. The switching control circuit 232 periodically executes the process of FIG. 14, and first detects a signal from the insulation resistance meter 70 by the sensor 236 (step S <b> 210), and determines whether or not there is a signal from the insulation resistance meter 70 ( Step S220).
  If it is determined in step S220 that there is a signal from the insulation resistance meter 70 (step S220, Yes), the switching control circuit 232 prohibits switching the input of the switch 231 to the second power system (step S230). . If the switching control circuit 232 determines that there is no signal from the insulation resistance meter 70 (step S220, No), it cancels the prohibition of switching of the switch 231 (step S240). If switching of the switch 231 is not prohibited, step S240 may be skipped.
Next, the switching control circuit 232 determines whether or not there is power supplied from the first power system 1 based on the detection result of the sensor 235 (step S250). If there is no power supplied from the first power system 1 (No at Step S250), the switching control circuit 232 determines whether switching of the switch 231 is prohibited (Step S260). When switching of the switch 231 is not prohibited (No at Step S260), the switching control circuit 232 determines that a power failure has occurred and sets the input of the switch 231 as the second power system (Step S270), and ends the process.
In addition, when switching of the switch 231 is prohibited (Yes at Step S260), the switching control circuit 232 ends the process without switching the input of the switch 231 to the second power system.
  As described above, according to the third embodiment, switching of the electric circuit that supplies power to the load system 4 is prohibited based on the signal from the insulation resistance meter 70. For this reason, in the power supply system 10 having a function of automatically switching a power path for supplying power to the load system 4 at the time of a power failure of the first power system, the load system 4 remains in the first power system even if the MCB 31 is turned off. Insulation resistance can be properly checked because it is not disconnected from the cable.
<Example 4>
In the second embodiment described above, switching of the switching device is controlled based on the signal from the MCB 31, but in the fourth embodiment, switching of the switching device is controlled based on the states of the inspection switches 237 and 238. . Since the other configuration is the same as that of the above-described second embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.
  FIG. 15 is a diagram illustrating a schematic configuration of the power supply system 10 according to the third embodiment. The inspection switches 237 and 238 are switches such as push buttons, levers, and dials, and are switched between a normal state and an inspection state by the operation of the inspector. The inspection switches 237 and 238 are connected to the switching control circuit 232, and the switching control circuit 232 can detect whether the inspection switches 237 and 238 are in the normal state or the inspection state. In this embodiment, an inspection switch 237 is provided at the position of the MCB 31, and an inspection switch 238 is provided in the storage battery unit 21. The inspection switches 237 and 238 may be provided on either one. Further, the inspection switch may be provided at another position of the power supply system 10.
FIG. 16 is an explanatory diagram of the switching control method according to the fourth embodiment. The switching control circuit 232 periodically executes the processing of FIG. 16, first detects the state of the inspection switches 237 and 238 (step S310), and determines whether or not the inspection switches 237 and 238 are in the inspection state (step S310). Step S320).
The switching control circuit 232 prohibits switching the input of the switch 231 to the second power system when the inspection switches 237 and 238 are determined to be in the inspection state in Step S320 (Step S320). . When the switching control circuit 232 determines that the inspection switches 237 and 238 are not in the inspection state (Step S320,
No), the prohibition of switching of the switch 231 is released (step S340). If switching of the switch 231 is not prohibited, step S340 may be skipped.
  Next, the switching control circuit 232 determines the presence or absence of power supplied from the first power system 1 based on the detection result of the sensor 235 (step S350). If there is no power supplied from the first power system 1 (No at Step S350), the switching control circuit 232 determines whether switching of the switch 231 is prohibited (Step S360). When switching of the switch 231 is not prohibited (No at Step S360), the switching control circuit 232 determines that a power failure has occurred and sets the input of the switch 231 as the second power system (Step S370), and ends the process.
Further, when switching of the switch 231 is prohibited (Yes in step S360), the switching control circuit 232 ends the process without switching the input of the switch 231 to the second power system.
  As described above, according to the fourth embodiment, switching of the electric circuit that supplies power to the load system 4 is prohibited based on whether the inspection switches 237 and 238 are in the inspection state. For this reason, in the power supply system 10 having a function of automatically switching a power path for supplying power to the load system 4 at the time of a power failure of the first power system, the load system 4 remains in the first power system even if the MCB 31 is turned off. Insulation resistance can be properly checked because it is not disconnected from the cable.
<Example 5>
In the fifth embodiment, when a power failure occurs at the time of inspection, this is notified. Since the other configuration is the same as that of the above-described second embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.
  The switching control circuit 232 of the fifth embodiment has a function of notifying an inspector that a power failure has occurred when it is detected that the power supply of the first power system has stopped during inspection. The means for notifying the inspector is, for example, output of a voice message, display on a display unit, output of a warning sound, lighting of a warning lamp, or a combination thereof. Moreover, you may transmit notifications, such as an email, to an inspector's terminal via a communication line.
  FIG. 17 is an explanatory diagram of the switching control method according to the fifth embodiment. Steps S110 to S170 are the same as the processing in FIG. In the fifth embodiment, after switching the input of the switch 231 in step S170 to the second power system, the switching control circuit 232 notifies that there is a power failure (step S180). The notification that a power failure has occurred may be configured every time a power failure occurs, or may be configured to be notified only when a power failure occurs immediately after inspection, for example, within a predetermined time. In addition, after a power failure, after a lapse of a predetermined time or when a reset operation is performed from an operation unit (not shown), the notification may be stopped by skipping step S180.
  Thus, according to the fifth embodiment, since it is possible to notify the inspector that a power failure has occurred, even if a power failure occurs during the inspection and power is not supplied when the MCB 31 is restored, the influence of the inspection is affected. Rather, it can clearly tell that it is the effect of a power outage.
  You may comprise the said Examples 1-5 in combination.
DESCRIPTION OF SYMBOLS 1 1st power system 2 2nd power system 3 Distribution board 4 Load system 41 Distribution board 5 for important loads Storage batteries 51 and 52 Load 10 Power supply system

Claims (5)

  1. A switching device that switches to supply power from one of the first power system or the second power system to the load,
    A switching means in which an input side is connected to the first power system and the second power system, and an output side is connected to the load;
    Switching control for controlling to switch the input of the switching means to the second power system and to supply the power from the second power system to the load at the time of a power failure of the first power system Means,
    Switching prohibiting means for prohibiting switching of the input of the switching means to the second power system at the time of inspection of the first power system ,
    Wherein when receiving a signal according to a check of the first power system, the switching device the switching inhibition means you prohibit the switching of the switching means determines that the time the inspection.
  2.   In the first power system, a detection unit is provided upstream from the section to be inspected and the section to be inspected, power is not supplied to the section to be inspected, and power is upstream from the section to be inspected. 2. The switching device according to claim 1, wherein when the supply is detected, the switching prohibiting unit determines that the inspection is being performed and prohibits switching of the switching unit.
  3. The switching device according to claim 1 or 2 , wherein when the inspection switch is switched from a normal state to an inspection state, the switching prohibiting unit determines that the inspection is being performed and prohibits switching of the switching unit.
  4.   The switching device according to claim 2, further comprising notification means for notifying that a power failure has occurred when detecting that the power supply upstream from the section to be inspected is stopped during the inspection.
  5. The switching device according to any one of claims 1 to 4 ,
    A power supply for supplying power of the second power system;
    Power supply system comprising.
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JP3519899B2 (en) * 1997-03-31 2004-04-19 三洋電機株式会社 Uninterruptible power system
JPH10336894A (en) * 1997-05-30 1998-12-18 Hitachi Eng Co Ltd Receiving and transforming unit and its feeding method
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