Power supply switching device and switch board

Patent metadata

Field	Value
Publication number	US-9825488-B2
Application number	US-201314370662-A
Country	US
Kind code	B2
Filing date	Jan 25, 2013
Priority date	Jan 27, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A power supply switching device and switch board checks whether or not a primary-side voltage of a remote shutoff breaker and a secondary-side voltage thereof become a rated voltage after a commercial power system is recovered from a blackout. Next, when both primary-side voltage and secondary-side voltage become the rated voltage, a contactor is actuated to interconnect a home power system with the commercial power system. Hence, charging of the home power system without causing a user to notice such a charging upon recovery of the commercial power system from a blackout can be prevented. As a result, the safety for the user can be ensured.

First claim

The invention claimed is:

1. A power supply switching device comprising:
a first parallel-off unit that parallels off a power storage and a load from a power system;
a first voltage detector which is disposed at a primary side of the first parallel-off unit, and which detects a voltage of the power system; and
a controller configured to determine whether the voltage detected by the first voltage detector indicates that the power system has recovered from a blackout when the first parallel-off unit is performing parallel-off from the power system on the power storage and the load;
wherein, when the controller determines that the voltage detected by the first voltage detector indicates that the power system has recovered from the blackout, the controller actuates the first parallel-off unit to interconnect the power storage and the load with the power system based on an instruction given by a user.

2. The power supply switching device according to claim 1 , wherein the controller actuates the first parallel-off unit to parallel off from the power system the power storage and the load upon absence of a detection of the voltage of the power system by the first voltage detector.

3. The power supply switching device according to claim 2 , further comprising a second parallel-off unit which is disposed at the primary side of the first parallel-off unit and which parallels off from the power system the power storage and the load,
wherein the controller actuates the second parallel-off unit together with the first parallel-off unit to parallel off the power storage and the load from the power system.

4. The power supply switching device according to claim 3 , further comprising a second voltage detector which is disposed between the first parallel-off unit and the second parallel-off unit, and which detects a voltage of the power system,
wherein the controller determines that the user has given an instruction, and interconnects the power storage and the load with the power system when the user operates the second parallel-off unit and the second voltage detector detects the voltage of the power system.

5. The power supply switching device according to claim 1 , wherein the first parallel-off unit is a latch type switch.

6. The power supply switching device according to claim 1 , wherein the first parallel-off unit is an earth leakage circuit breaker.

7. The power supply switching device according to claim 1 , further comprising:
a current measurer that measures a current supplied to the load; and
a solar battery connected at the primary side of the current measurer.

8. The power supply switching device according to claim 1 , wherein the power storage is distributed power supplies.

9. A switch board comprising:
the power supply switching device according to claim 1 ; and
a casing that retains thereinside the power supply switching device.

10. The switch board according to claim 9 , wherein the casing comprises:
a first casing that retains thereinside the first parallel-off unit; and
a second casing that retains thereinside a breaker which individually disconnects the load from the power system.

11. The switch board according to claim 9 , further comprising:
a first current detector that detects a current supplied to the switch board from the power system;
a second current detector that detects a current supplied to the load and the power storage; and
a wiring condition detector which compares the current detected by the first current detector with the current detected by the second current detector, and which detects respective wiring conditions of the first current detector and the second current detector.

12. The power supply switching device according to claim 1 ,
wherein, when the controller determines that the voltage detected by the first voltage detector indicates that the power system has recovered from the blackout, the controller actuates the first parallel-off unit to interconnect the power storage and the load with the power system in direct response to an instruction given by a user.

13. The power supply switching device according to claim 1 ,
wherein, when the controller determines that the voltage detected by the first voltage detector indicates that the power system has recovered from the blackout, the controller actuates the first parallel-off unit to interconnect the power storage and the load with the power system in direct response to a user turning on a shutoff breaker.

14. A monitoring device comprising:
a first voltage acquirer that acquire, from a first voltage detector which is disposed at a primary side of a first parallel-off unit that parallels off a power storage and a load from a power system and which detects a voltage of the power system, the voltage of the power system; and
a controller configured to determine whether the voltage acquired by the first voltage acquirer indicates that the power system has recovered from a blackout when the first parallel-off unit is performing parallel-off from the power system on the power storage and the load;
wherein, when the controller determines that the voltage acquired by the first voltage acquirer indicates that the power system has recovered from the blackout, the controller actuates the first parallel-off unit to interconnect the power storage and the load with the power system based on an instruction given by a user.

15. A power supply switching method comprising:
a first voltage acquisition step of acquiring, from a first voltage detector which is disposed at a primary side of a first parallel-off unit that parallels off a power storage and a load from a power system and which detects a voltage of the power system, the voltage of the power system;
a control step of determining whether the voltage acquired in the first voltage acquisition step indicates that the power system has recovered from a blackout when the first parallel-off unit is performing parallel-off from the power system on the power storage and the load; and
a control step of actuating the first parallel-off unit to interconnect the power storage and the load with the power system based on an instruction given by a user when the controller determines that the voltage acquired in the first voltage acquisition step indicates that the power system has recovered from the blackout.

16. A non-transitory computer-readable recording medium recording a program for causing a computer to execute:
a first voltage acquisition step of acquiring, from a first voltage detector which is disposed at a primary side of a first parallel-off unit that parallels off a power storage and a load from a power system and which detects a voltage of the power system, the voltage of the power system;
a control step of determining whether the voltage acquired in the first voltage acquisition step indicates that the power system has recovered from a blackout when the first parallel-off unit is performing parallel-off from the power system on the power storage and the load; and
a control step of actuating the first parallel-off unit to interconnect the power storage and the load with the power system based on an instruction given by a user when the controller determines that the voltage acquired in the first voltage acquisition step indicates that the power system has recovered from the blackout.

Assignees

• Shinomoto Yosuke
• Hatakeyama Kazunori
• Yamakawa Takashi
• Kasugai Makoto
• Tsuchimoto Naohide
• Mitsubishi Electric Corp

Inventors

• Shinomoto Yosuke
• Hatakeyama Kazunori
• Yamakawa Takashi
• Kasugai Makoto
• Tsuchimoto Naohide

Classifications

• H02J9/062

  for AC powered loads · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• Y10T307/625

  Cross-Sectional Technologies · mapped topic

• H02J3/383

  Electricity · mapped topic

• H02J9/061 Primary

  for DC powered loads · CPC title