JP2012253864A - Breaking auxiliary device and power feeding system circuit breaker - Google Patents

Breaking auxiliary device and power feeding system circuit breaker Download PDF

Info

Publication number
JP2012253864A
JP2012253864A JP2011123077A JP2011123077A JP2012253864A JP 2012253864 A JP2012253864 A JP 2012253864A JP 2011123077 A JP2011123077 A JP 2011123077A JP 2011123077 A JP2011123077 A JP 2011123077A JP 2012253864 A JP2012253864 A JP 2012253864A
Authority
JP
Japan
Prior art keywords
power supply
circuit
load
current
short
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2011123077A
Other languages
Japanese (ja)
Inventor
Hidekazu Hoshi
秀和 星
Tadatoshi Babasaki
忠利 馬場崎
Kaoru Asakura
薫 朝倉
Shunpei Inamori
隼平 稲森
Katsuhiko Kozuka
勝彦 小塚
Kensuke Murai
謙介 村井
Original Assignee
Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegr & Teleph Corp <Ntt>, 日本電信電話株式会社 filed Critical Nippon Telegr & Teleph Corp <Ntt>
Priority to JP2011123077A priority Critical patent/JP2012253864A/en
Publication of JP2012253864A publication Critical patent/JP2012253864A/en
Pending legal-status Critical Current

Links

Images

Abstract

PROBLEM TO BE SOLVED: To provide a breaking auxiliary device capable of early functioning a breaker irrespective of load-side impedance in a power feeding system.SOLUTION: A breaking auxiliary device 10, mounted on a power feeding system having a circuit breaker 110 installed to be placed between a power supply device 150 and a communication device 160, includes: an ammeter 11 for detecting a current value flowing into the communication device; a closed circuit mechanism 12 disposed between the breaker and the communication device, for making a cableway W for supplying power to the communication device into an insulation state or a short-circuit state; and when the current value detected by the ammeter is a preset current threshold or larger, a switch controller 13 for making the closed circuit mechanism 12 switch from the insulation state to the short-circuit state.

Description

  The present invention relates to a cutoff assisting device and a power feeding system, and more particularly, provided in a power feeding circuit for supplying power from a power source to a load device, and when a short circuit accident or the like occurs on the load device side, the power source and the load device It is related with what makes the circuit breaker which interrupts | blocks the electric circuit between to function early.

  In general, a power supply system is constructed so that an electric device receives AC power or DC power supplied from a public power supply device or an individual power supply device and operates, for example, a communication device such as an exchange or a router. In addition, when installing a plurality of load devices designed to operate with DC power, for example, as shown in FIG. 4, a current for distributing DC power supplied from the DC power supply device 150 to the plurality of load devices 160 is used. In some cases, the distribution device 100 is interposed.

  As this type of current distribution device, for example, as described in Patent Document 1, a circuit breaker 110 such as a fuse is interposed in the middle of the electric circuit W between the power supply device 150 and the load device 160. . In this power supply system, when an accident such as an overcurrent or a short circuit occurs, the circuit breaker 110 operates (functions) to cut off the power supply, thereby causing damage to the power supply device 150, the load device 160, and the like. It can be avoided in advance. Further, in the power supply system described in Patent Document 1, the capacitor 120 for stabilizing the power supplied to the other load device 160 until the circuit breaker 110 interrupts the electric circuit W due to the occurrence of a short circuit accident or the like. Is described.

JP 2007-31461 A

  In such a power feeding system, when a short-circuit accident occurs on the load device 160 side, the value of the current flowing through the circuit breaker 110 varies depending on the impedance of the path through which the short-circuit current flows. On the other hand, for example, when the circuit breaker 110 is constituted by a fuse, when the Joule heat generated by the short-circuit current flowing through the fuse exceeds the fusing energy, the fuse is blown and the power The electric circuit W between the device 150 and the load device 160 is interrupted.

  In this case, as a power feeding system, when the path through which the short circuit current flows is low impedance, a large current (short circuit current) flows from the power supply device 150 and the capacitor 120 to the circuit breaker 110 in a short time. As shown in FIG. 4A, the fuse of the circuit breaker 110 on the load device 160 side (low impedance electric circuit) that caused the short-circuit accident is blown out in a short time of 0.3 msec. At this time, as shown in FIG. 4B, the input power supply voltage supplied to the load device 160 that does not cause the short-circuit accident may be instantaneous voltage fluctuation, and the voltage fluctuation width is also suppressed to be small. It has been.

  However, when the path through which the short-circuit current flows is high impedance, the short-circuit current output from the power supply device 150 and the capacitor 120 flows to the circuit breaker 110 in a longer time than when the impedance is low, for example, As shown in FIG. 5A, the fuse of the circuit breaker 110 on the load device 160 side (high impedance electric circuit) that caused the short-circuit accident is blown out in about 20 msec or less. At this time, as shown in FIG. 5B, the input power supply voltage supplied to the load device 160 that does not cause the short-circuit accident is affected by the voltage drop due to the short-circuit current on the load device 160 side that caused the short-circuit accident. As a result, the voltage may be lowered to about 250 V, which is 400 V in the steady state. For this reason, when the lower limit value is 300 V as the drive voltage of the load device 160, the load device 160 stops.

  Note that the short-circuit current is a large-capacity current for a short time, most of which is output (charge released) from the capacitor 120 and melts the fuse of the circuit breaker 110 to cut off the electric circuit. Therefore, the capacitor 120 after the electric circuit is cut off. The input power supply voltage to the load device 160 also decreases during the charging period. Charging the capacitor 120 may take several hundreds msec, and the input power supply voltage shown in FIG. 5B also returns to the steady voltage of 400 V as the electric charge accumulates in the capacitor 120.

  In order to avoid the drive stop of the load device 160 due to the occurrence of this short circuit accident, the capacitor 120 having a capacity larger than that capable of stabilizing the power supply voltage even during a long voltage drop period due to high impedance is provided. It can be installed. However, since the large-capacity capacitor 120 is expensive and large, there is an inconvenience that the cost is increased and the occupied area is increased and the apparatus is increased in size.

  In addition, when the power supply voltage is stabilized while distributing the power supply current to the load device 160, a large-capacity capacitor corresponding to the number of distributions is required, so that the number of current distributions is limited. There is.

  Such a problem similarly occurs in a power supply system using an AC power supply device regardless of the power supply system using the DC power supply device.

  Therefore, an object of the present invention is to provide a break assisting device capable of causing a breaker to function early regardless of the load-side impedance in the power feeding system.

  A first aspect of the invention of a breakage assisting device that solves the above problem is a breakage assisting device that is mounted on a power supply system in which a breaker is installed so as to be interposed between a power supply device and a load device, wherein the load A current detection unit that detects the magnitude of a current value flowing into the device, and an electric circuit switching unit that is arranged between the circuit breaker and the load device and insulates or shorts between distribution lines that supply power to the load device And when the detection information corresponding to the magnitude of the current value detected by the current detection unit is greater than or equal to a preset set value, the electric circuit switching unit switches between the distribution lines from the insulated state to the short-circuit state. And an electric circuit control unit.

  In this aspect, when the electric current more than a setting value flows into the load apparatus side, between the distribution lines for the electric power supply between a circuit breaker and a load apparatus can be switched from an insulation state to a short circuit state. Therefore, a short circuit path can be formed in the front stage of the load device, and a large current can be instantaneously passed through the circuit breaker.

  According to a second aspect of the invention of a shut-off assist device that solves the above problem, in addition to the specific matter of the first aspect, the current detection unit measures a value of a current flowing through the distribution line in the previous stage of the load device. It is comprised by an ammeter, The magnitude | size of the said current value is detected with the current value itself which flows into the said distribution line, It is characterized by the above-mentioned.

  In this aspect, the magnitude of the current value flowing into the load device is detected by an ammeter, and it is determined whether or not a current greater than a set value, such as a short-circuit current, has flowed according to the current value. Can do.

  According to a third aspect of the invention of the interruption assisting device that solves the above-mentioned problem, in addition to the specific matter of the first aspect, the current detection unit includes an upstream side and a downstream side in the same distribution line in the previous stage of the load device. The voltmeter is configured to measure a voltage value generated between the voltmeter, and the magnitude of the current value flowing through the distribution line is detected by the voltage value measured by the voltmeter.

  In this aspect, the magnitude of the current value flowing into the load device is detected by a voltmeter as a voltage drop caused by a large current such as a short circuit current flowing through an electric circuit having a constant circuit resistance, and according to the voltage value It can be determined whether or not a current larger than a set value such as a short-circuit current flows.

  A first aspect of the invention of a power feeding system that solves the above problem is a power feeding system in which a circuit breaker is installed so as to be interposed between a power supply device and a load device, and a fuse is installed as the circuit breaker. In addition, any one of the first to third shut-off assist devices is provided.

  In this aspect, at the time of occurrence of a short-circuit accident or the like, regardless of the impedance on the load device side, a large current can be instantaneously passed through a fuse selected as a circuit breaker installed in the power supply system, and blown. The electric circuit can be interrupted early.

  A second aspect of the invention of a power supply system that solves the above problem is a power supply system in which a circuit breaker is installed so as to be interposed between a power supply device and a load device, and outputs DC power as the power supply device. In addition to the DC power supply device, a capacitor for stabilizing the supply voltage is installed at a subsequent stage of the DC power supply device, and includes any one of the first to third cutoff assisting devices.

  In this aspect, when a short circuit accident occurs, the circuit breaker installed in the power feeding system can be made to function by instantaneously flowing a circuit breaker regardless of the impedance on the load device side, and the circuit is interrupted early. At the same time, the discharge of electric charge from the capacitor can be reduced to suppress the decrease in the input power supply voltage.

  Thus, according to one aspect of the present invention, in the event of a short-circuit accident or the like in which a current greater than a set value flows to the load device side, the circuit breaker is not dependent on the impedance on the load device side via the short-circuit path in the previous stage of the load device. A large current can be instantaneously flowed to function. Therefore, it can be avoided that the input power supply voltage of another load device not related to the short circuit accident is lowered for a long period of time. Further, even in a circuit using a large-capacity capacitor, the supply voltage to the load device that is not related to a short-circuit accident can be restored in a short time by suppressing a decrease in the power supply voltage. As a result, the effects of short-circuit accidents can be converged in a short period of time, and there is no need to prepare an unnecessarily large-capacity capacitor (with no limitation on the number of distributions). Possible power supply systems can be constructed.

It is a figure which shows the interruption | blocking auxiliary | assistance apparatus and electric power feeding system which concern on 1st Embodiment of this invention, and is a circuit diagram which shows the whole structure. It is a figure which shows the interruption | blocking auxiliary | assistance apparatus and electric power feeding system which concern on 2nd Embodiment of this invention, and is a circuit diagram which shows the whole structure. It is a circuit diagram which shows the electric power feeding system of related technology. It is a figure explaining the time of a short circuit accident occurrence, (a) is a graph which shows the short circuit current specification when the load apparatus side is low impedance, (b) is a graph which shows the input power supply voltage characteristic at the time of the short circuit. It is a figure explaining the time of a short circuit accident occurrence, (a) is a graph which shows the short circuit current specification when the load apparatus side is high impedance, (b) is a graph which shows the input power supply voltage characteristic at the time of the short circuit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a cutoff assisting device and a power feeding system according to a first embodiment of the present invention. Here, this embodiment will be described by taking as an example a case where it is applied to the DC power supply system described with reference to FIG. 3 (the same applies to other embodiments described below).

  In FIG. 1, the shut-off assist device 10 is installed in a DC power supply system that operates a plurality of communication devices (load devices) 160 such as an exchange and a router. The shut-off assist device 10 is output by the DC power supply device 150. It is arranged in the current distribution device 100 that distributes and supplies the direct current power to each communication device 160.

  Here, in the current distribution device 100, the circuit breaker 110 is disposed in the previous circuit (distribution line) W for each communication device 160. The circuit breaker 110 is configured by a fuse set in advance so as to blow when a current of a certain capacity or more flows. For example, when a short circuit accident occurs for some reason on the communication device 160 side, etc. Is cut off by Joule heat generated by a short-circuit current (overcurrent) flowing through the power supply circuit 150, thereby opening a conductive connection with the power supply device 150 via the electric circuit W, thereby blocking the inflow of overcurrent to the communication device 160 at the subsequent stage and protecting it. To do.

  In addition, a capacitor 120 is connected to the current distribution device 100 in parallel with the power supply device 150, and the capacitor 120 stabilizes a power supply voltage of power supplied from the power supply device 150 to the communication device 160. .

  The interruption assisting device 10 is disposed in the electric circuit W between the circuit breaker 110 and the communication device 160, and is a wiring ammeter (current detection) that measures the current value of the DC power supplied to the communication device 160. Part) 11 and a closing mechanism (electrical circuit switching part) that forms a short-circuited closed circuit when a control signal described later is received between the positive electrode side electric circuit W1 and the negative electrode side electric circuit W2 of the power supply device 150 that is in an insulated state at the steady state. ) 12 and a current value (detection information) detected by the wiring ammeter 11 and a preset current threshold (set value), for example, a fusing current value (current threshold) of a fuse of the circuit breaker 110 is compared. And a switching control unit (electric circuit control unit) 13 for operating the closed circuit 12 by sending a control signal for switching from the insulated state to the closed circuit when the detected current value is equal to or greater than the current threshold. Composed To have.

  This interruption assisting device 10 employs a wiring current transformer (CT) as a wiring ammeter 11, and this wiring ammeter 11 is constructed in a clamp structure and can be opened and closed. The electric path W through which current flows can be accommodated in the (magnetic core) so that it can be installed later. Further, the closing mechanism 12 is sufficient to short-circuit between the positive-side electric circuit W1 and the negative-side electric circuit W2 of the power supply device 150 so that a short-circuit current that instantaneously blows the built-in fuse of the circuit breaker 110 flows. It is preferable that the power supply device 150 and the electric circuit W have an internal resistance that does not cause an excessive load to be damaged.

  Thereby, for example, when a short circuit accident due to some cause occurs on the communication device 160 side, the interruption assisting device 10 has a current value of a short circuit current (overcurrent) flowing from the power supply device 150 or the capacitor 120 side to the circuit breaker 110. When the fusing current value exceeding the fusing energy of the built-in fuse is instantaneously exceeded, the electric power supply to the communication device 160 can be cut off immediately. At this time, the input power supply voltage to the other communication device 160 that does not cause a short-circuit accident by reducing the discharge of charge from the capacitor 120 does not decrease for a long time.

  Even if the wiring ammeter 11 detects that the short-circuit current value flowing through the circuit breaker 110 is equal to or greater than the fusing current value, the impedance on the communication device 160 side is high, and the short-circuit current value is equal to the fusing current value. Since it does not greatly exceed, the break assisting device 10 functions even when the circuit condition takes time for the Joule heat generated in the built-in fuse of the circuit breaker 110 to exceed its fusing energy. That is, when the wiring ammeter 11 detects a short-circuit current value that is equal to or greater than the current threshold value (fusing current value), the switching control unit 13 immediately sends a control signal to the closing mechanism 12, so that the closing mechanism 12 becomes a power supply device. A closed circuit can be formed between the positive electrode side electric circuit W1 and the negative electrode side electric circuit W2 and can be short-circuited. Therefore, a short-circuit current exceeding the fusing energy can be immediately flowed into the built-in fuse of the circuit breaker 110 without being affected by the impedance on the communication device 160 side, so that the power supply to the communication device 160 is cut off in a short time. can do. Similarly, at this time, the input power supply voltage to the other communication device 160 that does not cause a short circuit accident by reducing the discharge of electric charge from the capacitor 120 does not drop for a long time.

  Here, for example, when a closed circuit is formed between the positive electrode side electric circuit W1 and the negative electrode side electric circuit W2 of the power supply apparatus 150 by using a semiconductor element for the closing mechanism 12, the switching control unit 13 starts the closing mechanism. Even if the signal transmission to 12 takes about 1 μsec and the closing operation of the semiconductor element of the closing mechanism 12 takes about 1 μsec, the interruption time of about 20 msec described in FIG. 5 does not take. For this reason, even when a short-circuit accident or the like occurs on the high impedance communication device 160 side, it is possible to avoid a voltage drop over a long period of time and to supply power with stable power supply voltage with high quality to other communication devices. 160 can be supplied.

  For this reason, it is not necessary to limit the number of connections (distribution number) of the communication devices 160 that are connected so as to be able to supply the distribution by the capacity of the capacitor 120 only by arranging the breaker auxiliary device 10 together with the circuit breaker 110 in the power supply system.

  Thus, in this embodiment, when a short circuit accident or the like occurs on the communication device 160 side, the positive electrode side electric circuit W1 and the negative electrode side electric circuit W2 of the power supply device 150 can be short-circuited by another path, and the load device 160 Regardless of the impedance on the side, a large current can be instantaneously passed through the circuit breaker 110 to blow the built-in fuse and cut off the power supply. Therefore, a voltage drop caused by a short-circuit current until the circuit breaker 110 functions or a voltage drop during the charging period of the capacitor 120 caused by discharging a large amount of electric charge during this voltage drop period causes a short-circuit accident. It is possible to avoid affecting the input power supply voltage of another irrelevant communication device 160, and it is possible to restart the power supply of the stable power supply voltage to the communication device 160 without a short circuit accident at an early stage. As a result, the effects of the short-circuit accident can be converged in a short period of time, and the necessity of preparing an unnecessarily large-capacitance capacitor 120 can be eliminated, and the number of connectable communication devices 160 can be reduced without limitation. A power feeding system capable of supplying high-quality power can be constructed.

  Next, FIG. 2 is a figure which shows 2nd Embodiment of the electric current determination apparatus based on this invention. Here, since the present embodiment is configured in substantially the same manner as the first embodiment described above, the same components are denoted by the same reference numerals and the characteristic portions will be described.

  In FIG. 2, the interruption assisting device 10 includes a voltmeter 21 that detects a voltage value generated between the upstream side and the downstream side of the electric circuit W not including a load, instead of the wiring ammeter 11. . The switching control unit 13 detects the voltage value (detection information) detected by the voltmeter 21 and a preset voltage threshold value (set value), for example, when a fusing current flows through the fuse of the circuit breaker 110, A voltage value (voltage threshold value) generated by the resistance component is compared, and when the detected voltage value is equal to or greater than the voltage threshold value, it is determined that an overcurrent has occurred due to a short circuit, and the closed circuit 12 is switched from an insulated state to a closed circuit A control signal for switching to is sent out and operated. Here, as the electric circuit W, a distribution line capable of supplying electric power with a current capacity sufficient for the communication device 160 to function without problems is selected, but when a short-circuit accident occurs, a large-capacity current flows through the electric circuit W. A voltage drop of a voltage value that can be measured by the electric circuit W and the general-purpose non-precision voltmeter 21 occurs between the upstream side and the downstream side. Here, the case where the voltmeter 21 is installed in the electric circuit W without a load will be described as an example. However, the present invention is not limited to this, and the voltage drop at both ends of the resistance component on the circuit continuous to the electric circuit W is described. Needless to say, it may be measured.

  Thereby, the interruption | blocking auxiliary | assistant apparatus 10 can detect the voltage value produced according to the magnitude | size of the electric current which flows into the electric circuit W, the voltmeter 21 can detect the magnitude | size of the electric current which flows through the electric circuit W, and the voltage When the value is equal to or higher than the voltage value when the short-circuit current (the fusing current of the built-in fuse of the circuit breaker 110) flows, the switching control unit 13 can immediately send a control signal to the closing mechanism 12. For this reason, the closing mechanism 12 can form a closed circuit between the positive electrode side electric circuit W1 and the negative electrode side electric circuit W2 of the power supply device 150 and short-circuit the same as in the above-described embodiment, depending on the impedance on the communication device 160 side. Without being affected, a short-circuit current exceeding the fusing energy can be caused to flow into the built-in fuse of the circuit breaker 110, so that the power supply to the communication device 160 can be cut off early.

  Thus, in this embodiment, the same operation effect as the above-mentioned embodiment can be obtained. Here, whether the ammeter 11 or the voltmeter 21 is installed in the electric circuit W may be selected according to the detectable current value or voltage value according to the magnitude of the short circuit current flowing in the electric circuit W.

  Here, in the above-described embodiments, a case where the present invention is applied to a power supply system including the DC power supply device 150 will be described as an example. However, the present invention is not limited to this, and for example, the present invention is also applied to a power supply system employing an AC power supply. be able to.

  The scope of the present invention is not limited to the illustrated and described exemplary embodiments, but includes all embodiments that provide the same effects as those intended by the present invention. Further, the scope of the invention is not limited to the combinations of features of the invention defined by the claims, but may be defined by any desired combination of particular features among all the disclosed features. .

  Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 10 Breaking auxiliary device 11 Wiring ammeter 12 Closing mechanism 13 Switching control part 21 Voltmeter 100 Current distribution device 110 Circuit breaker 120 Capacitor 150 DC power supply device 160 Communication device W Electric circuit

Claims (5)

  1. A breaker auxiliary device mounted on a power supply system in which a breaker is installed so as to be interposed between a power supply device and a load device,
    A current detector configured to detect a magnitude of a current value flowing into the load device; and an electric circuit disposed between the circuit breaker and the load device to place an insulated state or a short circuit between distribution lines supplying power to the load device When the detection information according to the magnitude of the current value detected by the switching unit and the current detection unit is greater than or equal to a preset setting value, the electrical circuit switching unit is switched from an insulated state to a short-circuited state between the distribution lines. An interruption assisting device comprising: an electric path control unit to be switched.
  2.   The current detection unit is configured by an ammeter that measures a current value flowing through the distribution line in the previous stage of the load device, and detects the magnitude of the current value from the current value flowing through the distribution line. The interruption | blocking auxiliary | assistance apparatus of Claim 1.
  3.   The current detection unit is configured by a voltmeter that measures a voltage value generated between an upstream side and a downstream side in the same distribution line in the previous stage of the load device, and determines a magnitude of a current value flowing through the distribution line. It detects with the voltage value which the said voltmeter measures, The interruption | blocking assistance apparatus of Claim 1 characterized by the above-mentioned.
  4. A power supply system in which a circuit breaker is installed so as to be interposed between a power supply device and a load device,
    A power supply system comprising a break assisting device according to any one of claims 1 to 3, wherein a fuse is installed as the breaker.
  5. A power supply system in which a circuit breaker is installed so as to be interposed between a power supply device and a load device,
    4. The interruption assisting device according to claim 1, wherein a capacitor for stabilizing a supply voltage is installed downstream of the DC power supply device together with a DC power supply device that outputs DC power as the power supply device. 5. A power supply system comprising:
JP2011123077A 2011-06-01 2011-06-01 Breaking auxiliary device and power feeding system circuit breaker Pending JP2012253864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011123077A JP2012253864A (en) 2011-06-01 2011-06-01 Breaking auxiliary device and power feeding system circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011123077A JP2012253864A (en) 2011-06-01 2011-06-01 Breaking auxiliary device and power feeding system circuit breaker

Publications (1)

Publication Number Publication Date
JP2012253864A true JP2012253864A (en) 2012-12-20

Family

ID=47526130

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011123077A Pending JP2012253864A (en) 2011-06-01 2011-06-01 Breaking auxiliary device and power feeding system circuit breaker

Country Status (1)

Country Link
JP (1) JP2012253864A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139028A (en) * 1980-03-31 1981-10-30 Nippon Electric Co Power source circuit
JPS6270629U (en) * 1985-10-22 1987-05-06
JPH10124154A (en) * 1996-10-21 1998-05-15 Nec Gumma Ltd Power circuit
JPH1198846A (en) * 1997-09-22 1999-04-09 Mitsubishi Electric Corp Converter equipment
JP2010110135A (en) * 2008-10-30 2010-05-13 Kyocera Corp Electronic equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139028A (en) * 1980-03-31 1981-10-30 Nippon Electric Co Power source circuit
JPS6270629U (en) * 1985-10-22 1987-05-06
JPH10124154A (en) * 1996-10-21 1998-05-15 Nec Gumma Ltd Power circuit
JPH1198846A (en) * 1997-09-22 1999-04-09 Mitsubishi Electric Corp Converter equipment
JP2010110135A (en) * 2008-10-30 2010-05-13 Kyocera Corp Electronic equipment

Similar Documents

Publication Publication Date Title
DE102014001884B4 (en) Electrical protection device and method
CN106887823B (en) disconnection of photovoltaic strings conveying direct current power
CN103166439B (en) A kind of essential safe type energy limited circuit
EP2494571B1 (en) An hvdc breaker and control apparatus for controlling an hvdc breaker
EP2780923B1 (en) Hvdc hybrid circuit breaker with snubber circuit
CN104756339B (en) Circuit interrupting equipment
ES2340079T3 (en) Provision of load sectioners.
CA2780946C (en) Device and method to break the current of a power transmission or distribution line and current limiting arrangement
US9172077B2 (en) Low-loss storage battery
KR101450502B1 (en) Short-circuit protection device and switchgear assembly having such protection devices
KR101506581B1 (en) High-voltage DC circuit breaker
DE102011056577C5 (en) Circuit arrangement for suppressing a occurring during a switching arc
CN104137372B (en) There is the DC power system of systems protection capability
JP2016213179A (en) DC circuit breaker and method of use
WO2012147598A1 (en) Charging/discharging control device, battery pack, electrical equipment, and charging/discharging control method
US20100254046A1 (en) Controlling arc energy in a hybrid high voltage dc contactor
US20120139347A1 (en) Reverse current sensor
US7075767B2 (en) Fault current limiting system and method
US7586725B2 (en) Method of providing a secondary means of overload protection and leakage current protection in applications using solid state power controllers
CN102067421B (en) A power apparatus for a high voltage electrical power system
US9450397B2 (en) Circuit breaking arrangement
US20100079108A1 (en) Battery unit and battery system using the battery unit
KR101136707B1 (en) Secondary battery device
EP3047556B1 (en) Circuit arrangement for a photovoltaic inverter for break relief using short-circuit switches, and uses of said circuit arrangement
US20120140363A1 (en) Overvoltage Protection for Inverters that Comprise an EMC Filter at Their Input End

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20130814

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20140421

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20140430

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20140902