WO2018163413A1 - 電子式回路遮断器 - Google Patents
電子式回路遮断器 Download PDFInfo
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- WO2018163413A1 WO2018163413A1 PCT/JP2017/009746 JP2017009746W WO2018163413A1 WO 2018163413 A1 WO2018163413 A1 WO 2018163413A1 JP 2017009746 W JP2017009746 W JP 2017009746W WO 2018163413 A1 WO2018163413 A1 WO 2018163413A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/334—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control
- H02H3/335—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means to produce an artificial unbalance for other protection or monitoring reasons or remote control the main function being self testing of the device
Definitions
- the present invention relates to an electronic circuit breaker capable of performing an independent test operation offline by supplying an external power supply from a test apparatus, and more particularly to a power supply circuit thereof.
- Patent Document 1 Japanese Patent Application Laid-Open No. 8-331748
- Patent Document 2 Japanese Patent Application Laid-Open No. 9-211089
- the power consumption during the test of an electronic circuit breaker that uses a part of the detected current as an operation power source of the electronic circuit is reduced and the trip detection is performed.
- Patent Document 2 There has been disclosed a test apparatus for individually performing an off-line operation test on a circuit constituted by dividing a circuit into instantaneous trip and time trip.
- JP-A-8-331748 Japanese Patent Laid-Open No. 9-211089
- the electronic circuit breaker disclosed in Patent Document 1 is a circuit breaker that uses a part of a detected current as an operating power source for a control circuit, and is a secondary current of a current transformer that detects a current in an AC circuit.
- the output of the rectifier circuit that converts the current into a unidirectional current is divided into a smoothing capacitor side and a current detection resistor side by a switching element, the voltage of the current detection resistor is monitored to operate the instantaneous trip circuit, and the smoothing circuit
- the output voltage of the capacitor is used as the operating power supply for the control circuit.
- the electronic circuit breaker test apparatus disclosed in Patent Document 2 reduces the power consumption during the test of the electronic circuit breaker in which a part of the detected current is used as the operation power source of the electronic circuit,
- the trip detection circuit performs an off-line operation test individually on a circuit that is divided into instantaneous trip and time trip.
- FIG. 1 is a block diagram showing an electronic circuit breaker in which the circuit breaker disclosed in Patent Document 1 is combined with the test device disclosed in Patent Document 2, and the electronic circuit breaker in the process leading to the present invention is shown in FIG. Is shown.
- an electronic circuit breaker 1A is connected to an open / close contact 3 that opens and closes an AC circuit 2 and a secondary side of a current transformer 4 inserted in the AC circuit 2, and converts the output current into a detection voltage.
- a power supply circuit that converts the output current of the rectifier circuit 7 that rectifies the output current into a voltage source and supplies power to the determination circuit 6 is provided.
- This power supply circuit includes a voltage monitoring circuit 8, a current control transistor 9 as a first switching element, an overvoltage protection Zener diode 10, a load disconnecting transistor 11 as a second switching element, a pull-up resistor 12, a backflow prevention diode. 13 and a control transistor 14 which is a third switching element for controlling the load disconnecting transistor 11.
- the current control transistor 9, the load disconnecting transistor 11, and the control transistor 14 are each composed of a bipolar transistor or a field effect transistor.
- the electronic circuit breaker 1A includes a rectifier diode 18 that prevents reverse current when power is supplied from the operation test device 15 via the terminals 16 and 17, and an instantaneous trip output from the operation test device 15.
- the switching diode 19 for switching between the signal and the timed trip signal, the trip coil 21 energized via the thyristor 20 by the output signal of the judgment circuit 6, and the switching contact 3 opened when the trip coil 21 is energized.
- a tripping mechanism (not shown) that is driven apart.
- Reference numeral 22 denotes a smoothing capacitor
- reference numeral 23 denotes a test detection resistor
- reference numeral 24 denotes a terminal for supplying an operation test signal of the operation test apparatus 15 to the switching diode 19.
- the electronic circuit breaker 1A shown in FIG. 1 is configured as described above, and the operation when the operation test device 15 is used is that the power to the circuit is input from the outside when the AC circuit 2 is not energized. Therefore, the constant current I IN inside the connected operation test apparatus 15 is supplied from the terminal 16 to the power supply circuit via the rectifier diode 18.
- the constant current I IN is charged into the smoothing capacitor 22 via the load disconnecting transistor 11 and converted into the output voltage VOUT and supplied to the determination circuit 6.
- the output voltage VOUT is voltage-detected by the voltage monitoring circuit 8. If the output voltage VOUT is larger than a predetermined threshold value, a signal is output to the base of the current control transistor 9, and the constant current IIN is set to GND via the current control transistor 9. By bypassing, the output voltage V OUT is controlled.
- the operation test device 15 determines the instantaneous trip test circuit 6a for determining the instantaneous operation test signal from the terminal 24, or the time limit determination for determining the time trip test signal. Either one of the removal determination circuits 6b is selected, and a constant current operation test signal ITEST1 or ITEST2 is supplied.
- the operation test signal I TEST1 or I TEST2 generates a voltage corresponding to overcurrent application by the test detection resistor 23 and the current detection resistor 5, and the pseudo overcurrent is detected by the instantaneous trip determination circuit 6a of the determination circuit 6 or the time limit. Any one of the tripping determination circuits 6b is detected.
- the terminal 17 is a ground.
- Either the instantaneous trip judgment circuit 6a or the timed trip judgment circuit 6b of the judgment circuit 6 outputs a trip signal V TRIP to the gate of the thyristor 20 when the detected voltage value exceeds a predetermined threshold value.
- the control transistor 14 of the power supply circuit is turned on, and the base-emitter voltage of the load disconnecting transistor 11 becomes the GND potential, and the output voltage V OUT ⁇ 0V.
- the output of the voltage monitoring circuit 8 is turned off, the current control transistor 9 is turned off, and the constant current I IN flows into the tripping coil 21.
- the tripping coil 21 is driven to open the switching contact 3.
- the tripping operation detection voltage VIN2 between the terminal 16 of the operation test device 15 and GND is a determination circuit which is a load of the power supply circuit because the load releasing transistor 11 is off and the current control transistor 9 is off.
- the pull-off motion detection voltage V IN2 is compared to the previous pull-off operation, increases.
- Operation test apparatus 15 the tripping operation detection voltage V IN2 is detected by the operation test apparatus 15 in a state exceeding the threshold value of a predetermined tripping operation detection lasts several ms is tripping operation of the electronic circuit breaker 1A Is detected and the trip operation time is detected.
- FIG. 2 shows operation waveforms when the electronic circuit breaker 1A shown in FIG. 1 causes a problem.
- (a) shows the supply current I IN of the operation test apparatus 15,
- (b) shows the output voltage V OUT of the power supply circuit,
- (c) shows the output voltage of the voltage monitoring circuit 8, and
- (d ) Shows the base voltage V B of the load disconnecting transistor 11, and
- (e) shows the anode-cathode voltage V SR of the thyristor 20.
- (F) shows the trip signal V TRIP
- (g) shows the operation test signal I TEST1 or I TEST2
- (h) shows the voltage V IN2 of the terminal 16 of the operation test apparatus 15, and (i) Indicates the timing of detection of the tripping operation of the operation test device 15, and (j) indicates the count of detection of the tripping operation of the operation test device 15.
- the power supply to the determination circuit 6 is only the charging current of the smoothing capacitor 22, and the tripping operation output signal by the instantaneous trip determination circuit 6a and the timed trip determination circuit 6b is maintained.
- the time is t1 depending on the remaining capacity of the smoothing capacitor 22 as shown in FIG.
- the tripping operation is detected n times at the timing t2 of the tripping operation detection as shown in FIG. As shown in FIG. 2 (j), exceeds the detection voltage threshold tripping voltage of the tripping operation detection voltage V IN2 terminal, when exceeding a predetermined threshold by being n times counted up, the operation test apparatus 15 If the tripping operation is detected, the trip signal duration needs to be t1 ⁇ (t2 ⁇ n).
- the trip operation output signal duration t1 ⁇ (t2 ⁇ n), and the operation test device 15 cannot detect the trip operation. Further, after the trip signal V TRIP is stopped, the control transistor 14 is turned off, so that the load disconnecting transistor 11 is turned on, and the current supply to the determination circuit 6 is resumed. On the other hand, since the thyristor 20 is kept on, the input current is tripped and shunted to the coil 21 and the power supply circuit, and the output voltage VOUT does not reach the starting voltage of the determination circuit 6, so the operation test device 15 The tripping operation cannot be detected.
- the operation test apparatus 15 can detect the tripping, but it has a problem that the rise time of the output voltage of the power supply circuit is affected and the high-speed operation cannot be performed. appear.
- the present invention has been made in order to solve the above-described problems.
- the electronic circuit can be downsized by reducing the capacity of the smoothing capacitor, and can be operated at high speed by reducing the capacity of the smoothing capacitor.
- the purpose is to obtain a circuit breaker.
- An electronic circuit breaker is connected to a switching contact that is inserted into an AC circuit and opened and closed by a tripping coil, and a secondary side of a current transformer that detects a current flowing through the AC circuit,
- a rectifier circuit that converts a secondary-side output current into a unidirectional current; a first switching element connected to the output side of the rectifier circuit; a second switching element that disconnects a load from the output side of the rectifier circuit;
- the voltage monitoring circuit for controlling the first switching element, and connected to the rectifier circuit.
- a current detection resistor for detecting a current of each layer of the current detection resistor, connected to the voltage suppression means, and monitoring a voltage generated by a current flowing through the current detection resistor, and when the monitored voltage exceeds a predetermined threshold, the tripping
- a determination circuit comprising an instantaneous trip determination circuit and a timed trip determination circuit for opening the switching contact via a coil; a test signal connected to the current detection resistor and connected in series with an input terminal of the determination circuit;
- the electronic circuit breaker According to the electronic circuit breaker according to the present invention, it is possible to reduce the capacity of the smoothing capacitor by providing the output voltage switching means of the power supply circuit and the output current suppressing means of the power supply circuit when the trip coil is operated. Therefore, the electronic circuit can be miniaturized, and high-speed operation can be achieved by reducing the capacity of the smoothing capacitor.
- FIG. FIG. 3 is a block diagram showing the configuration of the electronic circuit breaker according to Embodiment 1 of the present invention
- FIG. 4 is a chart showing its operation waveforms.
- an electronic circuit breaker 1B is connected to a switching contact 3 that opens and closes an AC circuit 2, and a secondary side of a current transformer 4 inserted in the AC circuit 2, and converts the output current into a detected voltage.
- a power supply circuit that converts the output current of the rectifier circuit 7 that rectifies the output current into a voltage source and supplies power to the determination circuit 6 is provided.
- This power supply circuit includes a voltage monitoring circuit 8, a current control transistor 9 as a first switching element, an overvoltage protection Zener diode 10, a load disconnecting transistor 11 as a second switching element, a pull-up resistor 12, a backflow prevention diode.
- a control transistor 14 which is a third switching element for controlling the load disconnecting transistor 11, a first diode 25 which is a voltage switching means for switching an output voltage of a power supply circuit which will be described later, and a second which is a voltage suppressing means. It is comprised by the diode 26 of this.
- the current control transistor 9, the load disconnecting transistor 11, and the control transistor 14 are each composed of a bipolar transistor or a field effect transistor.
- the electronic circuit breaker 1B includes a rectifier diode 18 that prevents reverse current when power is supplied from the operation test apparatus 15 via the terminals 16 and 17, an instantaneous trip signal from the operation test apparatus 15, and a time limit.
- the tripping signal is switched between the switching diode 19, the tripping coil 21 that is biased by the output signal of the determination circuit 6 through the thyristor 20 of the switching element, and the switching contact 3 is opened when the tripping coil 21 is biased.
- a tripping mechanism (not shown) for driving.
- Reference numeral 22 denotes a smoothing capacitor
- reference numeral 23 denotes a test detection resistor
- reference numeral 24 denotes a terminal for supplying an operation test signal of the operation test apparatus 15 to the switching diode 19.
- the electronic circuit breaker 1B is configured as described above, and its power supply circuit, that is, a voltage monitoring circuit 8, a current control transistor 9, an overvoltage protection Zener diode 10, and a load disconnecting transistor 11 are provided.
- the pull-up resistor 12, the backflow prevention diode 13, the control transistor 14 of the load disconnecting transistor 11, the first diode 25, and the second diode 26 are connected to the current transformer 4 from the AC circuit 2.
- the alternating current input via the signal is converted into a predetermined direct current voltage, and the determination circuit 6 is supplied with power.
- the thyristor 20 When the thyristor 20 is turned on, the power supply circuit is turned off, Iout ⁇ 0, and the voltage of VIN1 is increased to supply current to the tripping coil 21.
- FIG. 4A shows the supply current I IN of the operation test apparatus 15
- FIG. 4B shows the output voltage V OUT of the power supply circuit
- FIG. 4C shows the output voltage of the voltage monitoring circuit 8
- (d ) Shows the base voltage V B of the load disconnecting transistor 11
- (e) shows the anode-cathode voltage V SR of the thyristor 20.
- (F) shows the trip signal V TRIP
- (g) shows the operation test signal I TEST1 or I TEST2
- (h) shows the voltage V IN2 of the terminal 16 of the operation test apparatus 15, and (i) Indicates the timing of detection of the tripping operation of the operation test device 15, and (j) indicates the count of detection of the tripping operation of the operation test device 15.
- the output voltage V OUT of the power supply circuit is detected by the voltage monitoring circuit 8 via the second diode 26, and when the voltage exceeds a predetermined threshold (for example, 12V) as shown in FIG. A voltage is output to the gate of the control transistor 9 to turn on the current control transistor 9. At this time, the constant current I IN flows into the collector of the current control transistor 9 and V IN ⁇ 0V.
- a predetermined threshold for example, 12V
- the load disconnection transistor 11 Since the load disconnection transistor 11 has a base current ⁇ 0, I OUT ⁇ 0.
- the output voltage VOUT decreases.
- the voltage monitoring circuit 8 falls below a predetermined threshold (for example, 11.9 V)
- the current control transistor 9 is turned off to turn it off again.
- the load disconnecting transistor 11 is turned on to charge the smoothing capacitor 22 with a current. Therefore, the voltage monitoring circuit 8 controls the output voltage VOUT to a constant voltage with respect to the input of the constant current IIN .
- the determination circuit 6 After the determination circuit 6 is activated, either one of the operation test signals I TEST2 and I TEST1 selected from the operation test device 15 is applied to the test detection resistor 23 via the switching diode 19. At this time, the determination circuit 6 detects the voltage value generated by the test detection resistor 23 and the current detection resistor 5 and outputs a trip signal V TRIP when the voltage exceeds a predetermined value. When the trip signal V TRIP is output, the thyristor 20 is turned on as shown in FIG. At the same time, the voltage monitoring circuit 8 is turned off, and the output to the base of the current control transistor 9 is turned off.
- the control transistor 14 of the load separating transistor 11 is turned on, the base voltage V B ⁇ 0, and the load separating transistor 11 is turned off, so that I OUT ⁇ 0. Since the impedance of the tripping coil 21 is larger than that of the determination circuit 6 that is a load of the power supply circuit, the input voltage VIN1 rises. At this time, when the pull-up resistor 12 is several tens k ⁇ (for example, 47 k ⁇ ), the current flowing through the emitter of the control transistor 14 is about several hundred ⁇ A (for example, 530 ⁇ A).
- the operation test device 15 detects the voltage value of VIN1 , and detects that the circuit breaker has operated when a predetermined threshold value (for example, 15V) is exceeded.
- the load disconnecting transistor 11 is controlled to be turned off by the trip signal V TRIP of the determination circuit 6, but this power supply source is switched to use the electric charge charged in the smoothing capacitor 22 as the power source. Therefore, the electric charge of the smoothing capacitor 22 decreases due to the consumption current generated by the determination circuit 6. Therefore, when the supply voltage to the determination circuit 6 falls below the minimum operating voltage, the trip signal V TRIP stops at several ms of t1 as shown in FIG.
- the trip signal V TRIP is stopped and the control transistor 14 is turned off and the load releasing transistor 11 is turned on, the power supply is supplied to the trip coil 21 and to the determination circuit 6.
- the output voltage VOUT of the power supply circuit in FIG. 2 (h) is lowered, and the operation test apparatus 15 becomes unable to detect trip. .
- the operation test device 15 In order for the operation test device 15 to perform the trip detection, the charge that charges the smoothing capacitor 22 in the determination circuit 6 until the count number exceeds the threshold value as shown in FIG. It is necessary to compensate only by this, and a large-capacity smoothing capacitor is required. In this case, since the speed of the CO operation of the electronic circuit breaker, that is, the speed of performing the breaking operation without delay after the closing operation becomes slow, a new problem occurs.
- the voltage V ON between the anode and the cathode of the thyristor 20 is used by using the first diode 25 which is the switching means for the output voltage of the power supply circuit and further using the second diode 26 which is the voltage suppressing means.
- the load disconnecting transistor 11 can always be kept off, and the tripping operation can be detected by the small-capacity smoothing capacitor 22.
- the operation principle that enables the smoothing capacitor 22 to be reduced in capacity will be described in detail.
- V BE 0.6 V
- V D1 0.
- V D2 the forward voltage of the second diode 26
- the output current I OUT is several tens of ⁇ A ( For example, if it occurs at about 50 ⁇ A), I IN >> I OUT and I OUT ⁇ 0.
- the tripping operation detection voltage VIN2 becomes stable as shown in FIG. 4 (i).
- the operation test device 15 can count the detection of the tripping operation for detection, the tripping operation can be detected.
- the smoothing capacitor 22 has a capacity capable of turning on the thyristor and stabilizing the output voltage VOUT.
- the capacity of the capacitor can be reduced, and the power supply circuit can be downsized. Furthermore, the capacity reduction of the smoothing capacitor 22 enables high speed operation.
- the electronic circuit breaker 1B when the trip coil 21 is operated, the first diode 25 that is a switching means for the output voltage of the power supply circuit and the voltage suppression means are used. Since the second diode 26 is provided, the capacity of the smoothing capacitor 22 can be reduced. Therefore, the electronic circuit can be reduced in size, and the capacity of the smoothing capacitor 22 can be reduced to enable high-speed operation.
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Abstract
Description
図1において、電子式回路遮断器1Aは、交流電路2を開閉する開閉接点3と、交流電路2に挿入された変流器4の2次側に接続され、その出力電流を検出電圧に変換する電流検出抵抗5と、電流検出抵抗5の検出電圧から過電流を判定する瞬時引き外し判定回路6aと時限引き外し判定回路6bの二種の判定回路を有する判定回路6と、変流器4の出力電流を整流する整流回路7の出力電流を電圧源に変換し、判定回路6に電源を供給する電源回路を備えている。この電源回路は、電圧監視回路8、第1のスイッチング素子である電流制御トランジスタ9、過電圧保護用ツェナーダイオード10、第2のスイッチング素子である負荷切り離し用トランジスタ11、プルアップ抵抗12、逆流防止ダイオード13、及び負荷切り離し用トランジスタ11を制御する第3のスイッチング素子である制御用トランジスタ14で構成されている。なお、電流制御トランジスタ9、負荷切り離し用トランジスタ11、制御用トランジスタ14は、それぞれバイポーラトランジスタまたは電界効果トランジスタで構成されている。
この発明の前記以外の目的、特徴、観点及び効果は、図面を参照する以下のこの発明の詳細な説明から、さらに明らかになるであろう。
図3はこの発明の実施の形態1に係る電子式回路遮断器の構成を示すブロック図で、図4はその動作波形を示すチャート図である。
図3において、電子式回路遮断器1Bは、交流電路2を開閉する開閉接点3と、交流電路2に挿入された変流器4の2次側に接続され、その出力電流を検出電圧に変換する電流検出抵抗5と、電流検出抵抗5の検出電圧から過電流を判定する瞬時引き外し判定回路6aと時限引き外し判定回路6bの二種の判定回路を有する判定回路6と、変流器4の出力電流を整流する整流回路7の出力電流を電圧源に変換し、判定回路6に電源を供給する電源回路を備えている。この電源回路は、電圧監視回路8、第1のスイッチング素子である電流制御トランジスタ9、過電圧保護用ツェナーダイオード10、第2のスイッチング素子である負荷切り離し用トランジスタ11、プルアップ抵抗12、逆流防止ダイオード13、負荷切り離し用トランジスタ11を制御する第3のスイッチング素子である制御用トランジスタ14、及び後述する電源回路の出力電圧を切り替える電圧切替手段である第1のダイオード25、電圧抑制手段である第2のダイオード26により構成されている。なお、電流制御トランジスタ9、負荷切り離し用トランジスタ11、制御用トランジスタ14は、それぞれバイポーラトランジスタまたは電界効果トランジスタで構成されている。
VB=VON+VD3=1.2V+0.7V=1.9V
となる。
VOUT=VB-VBE-VD1=(1.9V-0.6V-0.6V)=0.7V
となる。
VOUT2=VOUT-VD2=0.6V-VD2
で、VOUT2≒0とするためにはVD2≒0.6となる必要があるが、第2のダイオード26の順方向電圧は0.6V程度であれば出力電流IOUTが数十μA(例えば50μA)程度で生じるとすれば、IIN>>IOUTとなり、IOUT≒0となる。
Claims (4)
- 交流電路に挿入され、引き外しコイルにより開閉操作が行われる開閉接点と、
前記交流電路に流れる電流を検出する変流器の二次側に接続され、二次側出力電流を単方向電流に変換する整流回路と、
前記整流回路の出力側に接続された第1のスイッチング素子と、
前記整流回路の出力側から負荷を切り離す第2のスイッチング素子と、
前記第2のスイッチング素子の制御端子に接続され、引き外しコイルに直列接続されたサイリスタに接続された電源回路の出力電圧を切り替える電圧切替手段と、
前記第2のスイッチング素子の出力側に接続された電圧抑制手段と、
前記電圧抑制手段を介して接続され、前記第1のスイッチング素子の制御を行う電圧監視回路と、
前記整流回路に接続され、前記交流電路の各層の電流を検出する電流検出抵抗と、
前記電圧抑制手段を介して接続され、前記電流検出抵抗に流れる電流によって生じる電圧を監視し、監視電圧が所定の閾値を超えたとき、前記引き外しコイルを介して前記開閉接点を開離させる瞬時引き外し判定回路と時限引き外し判定回路からなる判定回路と、
前記電流検出抵抗に接続され、前記判定回路の入力端子と直列に接続されたテスト信号検出抵抗と、
前記交流電路が通電されていない場合に、外部から接続コネクタを介して前記整流回路の後段に定電流を入力するとともに、前記テスト信号検出抵抗にテスト信号を入力し、回路遮断器の引き外し動作テストを行う動作テスト装置と、
を備えたことを特徴とする電子式回路遮断器。 - 前記電圧抑制手段は、ダイオードまたはツェナーダイオードであることを特徴とする請求項1に記載の電子式回路遮断器。
- 前記電圧切替手段は、ダイオードであることを特徴とする請求項1または2に記載の電子式回路遮断器。
- 前記第1のスイッチング素子と前記第2のスイッチング素子は、それぞれバイポーラトランジスタまたは電界効果トランジスタであることを特徴とする請求項1から3の何れか一項に記載の電子式回路遮断器。
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PCT/JP2017/009746 WO2018163413A1 (ja) | 2017-03-10 | 2017-03-10 | 電子式回路遮断器 |
CN201780088040.8A CN110383613B (zh) | 2017-03-10 | 2017-03-10 | 电子式电路断路器 |
KR1020197021679A KR102225851B1 (ko) | 2017-03-10 | 2017-03-10 | 전자식 회로 차단기 |
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CN115291093A (zh) * | 2022-05-27 | 2022-11-04 | 国网江苏省电力有限公司南通供电分公司 | 一种基于电压监视的断路器工作状态检测方法及系统 |
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