JP6859989B2 - Circuit breaker with current control electrode - Google Patents

Description

The present invention relates to a circuit breaker with current control that cuts off a circuit current.

The use of DC voltage power supply has expanded worldwide as well as AC voltage power supply, and the use of DC voltage power supply is now expanding to consumer (for example: railway, trolley, electrolysis, mining, wind power, solar power generation). ..

Unlike the AC voltage power supply, this DC voltage power supply is supplied with a constant voltage and one polarity (positive electrode or negative electrode). Therefore, when an overcurrent (for example, a short circuit or a ground fault) occurs in the circuit, it is necessary to cut off the overcurrent under a constant voltage. Therefore, in recent years, various DC high-speed circuit breakers (for example, Non-Patent Document 1) ) Is being developed. On the other hand, in recent years, DC high-speed circuit breakers are increasingly required to be smaller, lighter, and have higher-speed breaking performance from the viewpoint of safe maintenance and management work.

By the way, a DC high-speed circuit breaker is generally composed of both electrical and mechanical operations. However, although it depends on the type of circuit breaker, the DC high-speed circuit breaker uses power electronics (switching technology, synchronization circuit, resonance circuit, etc.), arc runner, contact part, stopper, holding electromagnet (magnetic material), holding coil, opening and closing. There are elements such as springs, holding coils, adjusting iron cores, circuit breakers, tripping coils, induction shunts, and compressed air, and their operating mechanisms are complicated.

Here, as a DC high-speed circuit breaker, a configuration example including two contactor electrodes, that is, a movable contactor electrode and a fixed contactor electrode is known. Further, in a DC circuit including a DC high-speed circuit breaker, an example of adopting a non-contact current transformer (CT) as a means for detecting an overcurrent is widely known.

Further, the breaking performance required for a DC high-speed circuit breaker including an overcurrent detecting means is that when an overcurrent occurs in the circuit to be cut, in addition to detecting and measuring the overcurrent in a short time, the main current It is related to how to shorten the response time until the contact electrode for blocking the current is in a non-contact state and the arc discharge disappears.

The above-mentioned current transformer (CT) used as an overcurrent detecting means generally has a limited frequency band for detecting an overcurrent, and its detection performance is relatively inferior for a pulsed overcurrent. It is also known.

In addition, it is currently known that the time (operating time) from the detection of overcurrent until the movable contact part and the fixed contact part are in a non-contact state and the arc discharge current disappears is in the millisecond range. Has been done.

On the other hand, in recent years, when an overcurrent occurs in a DC electric circuit network, a current-voltage converter capable of detecting the overcurrent in nanoseconds is shown in Japanese Patent No. 6030293 (Patent Document 2). ing.

Mitsubishi Electric: Electricity No.1801 2018 February 7, 2018 Japanese Patent No. 6030293

As described above, in the case of a circuit breaker composed of a movable contact electrode and a fixed contact electrode as the contact electrode of the circuit breaker, the total current of the interrupted current is applied to the movable contact electrode and the fixed contact electrode. When the inflow state is brought into a non-contact state, an arc discharge occurs. All the arc discharge current (plasma-ized current) generated at this time flows into both contactor electrodes. Then, the surface of the electrode material of both contactor electrodes (movable contact electrode and fixed contactor electrode) into which the arc discharge current has flowed is burnt and deteriorated by the Joule heat of the arc discharge current.

For example, in a DC network in which a circuit breaker is provided as described above, an overcurrent (including: pulse property) flows in the case of a surge or short-circuit accident, or in the case of an electrical deterioration process of the electrical equipment used. At that time, the circuit breaker cuts off the circuit. At this time, an arc (spark discharge) is generated between the fixed contact portion and the movable contact portion of the circuit breaker at the time of blocking (that is, when the movable contact electrode and the fixed contact electrode are opened and closed). As a result, the contact surface is burnt and consumed.

Further, not only when an overcurrent occurs as described above, but also in a normal current cutoff, the number of arc discharges increases as the number of times the circuit breaker is operated increases. Then, the increase in the deteriorated area of the contact surface and the depth from the surface are promoted, and finally, the current cutoff performance may be deteriorated and become impossible.

In other words, the circuit breaker having the above-mentioned configuration may be burnt and deteriorated on the surface of the electrode material due to aged operation, and finally it becomes impossible to cut off the arc discharge current, resulting in a decrease in the operating life time. I can say.

The present invention has been made in view of the above circumstances, and a circuit breaker with a current control electrode capable of reducing burnout deterioration of the electrode surface due to an arc discharge current at the electrode contact portion and extending the operating life time of the circuit breaker. The purpose is to provide.

The breaker with a current control electrode according to one aspect of the present invention is a breaker with a current control electrode connected in series to the branch path in order to cut off a branch path current of an arbitrary closed circuit in a DC electric circuit network. A movable contact electrode connected to a predetermined DC power source in the branch path, a fixed contact electrode arranged so that one end thereof is in contact with or not in contact with the movable contact electrode, and the movable contact electrode. disposed on the assumption arc discharge path different from the space definitive between one end of the contact electrode and the fixed contact electrode, a current control with a conductive ring-shaped having a conductive protrusion for guiding the arc discharge current A predetermined attenuated vibration voltage due to a pulsed overcurrent generated in the electrode, the primary side circuit portion on the DC electric circuit network connected in series with the other end of the fixed contact electrode, and the DC electric circuit network. The current control electrode is connected to one end of the secondary circuit unit, and the grounding unit is connected to the other end of the secondary circuit unit. In the pulse generator capable of applying the attenuated vibration voltage generated in the secondary circuit section due to the pulsed overcurrent generated in the primary circuit section to the current control electrode, and in the DC electric circuit network. A current-voltage converter that is connected in series to the primary circuit section of the pulse generator and detects a pulsed overcurrent generated in the DC electric network, and the current-voltage converter generate a predetermined pulsed overcurrent. upon detecting, and a movable contact electrode driver for controlling the movement of the movable contact electrode so that said movable contact electrode and the fixed contact electrode moves from the contact state to the non-contact state, the When the current-voltage converter detects a pulsed overcurrent generated in the DC electric circuit network, the movable contact electrode driving unit moves and controls the movable contact electrode so as to be separated from the fixed contact electrode. When the attenuated vibration voltage generated in the pulse generator is applied, the current control electrode has the movable contact electrode and the fixed contact electrode in the vicinity of the current control electrode according to the polarity of the attenuated vibration voltage. The pulse generator repels or absorbs a predetermined charged particle generated by the arc discharge generated by the separation from the arc discharge, and further induces and controls a part of the arc discharge through the conductive protrusion. A part of the arc discharge induced and diverted at the current control electrode flows out toward the ground portion.

As described above, the circuit breaker with a current control electrode of the present invention includes a movable contact electrode, a fixed contact electrode, and a current control electrode, and when an overcurrent occurs in the DC network, the movable contact electrode is fixedly contacted. In a breaker that cuts off the branch path current by separating it from the child electrode, a part of the arc discharge current generated between the movable contact electrode and the fixed contact electrode is diverted, and the arc current flowing into the contact portion is transferred. By suppressing, reducing or extinguishing, it is possible to reduce the burnout deterioration of the movable contact electrode and the fixed contact electrode and extend the operating life time.

In order to divide the arc discharge current, a current control electrode, which is a third conductive electrode, is arranged in an electromagnetic space that electromagnetically affects the arc discharge current. Specifically, it is arranged between the movable contact electrode and the fixed contact electrode.

Then, an overcurrent flows into the movable contact electrode and the fixed contact electrode, and the arc discharge current generated by opening the movable contact electrode and the fixed contact electrode (making them non-contact state) is generated by the current control electrode. It is controlled by applying a positive electrode voltage, a negative electrode voltage, or a voltage having both polarities in time series, or by applying a vibration wave voltage (for example, an attenuated vibration voltage).

The polarity (positive or negative) of the voltage applied to this current control electrode is the charge of electrons, ions, discharge deterioration products, etc. generated by the arc discharge generated between the movable contact electrode and the fixed contact electrode. By repelling and absorbing particles, a part of the arc discharge current is induced and diverted to the current control electrode, the arc discharge current is controlled, and the arc discharge current flows into the movable contact electrode, the fixed contact electrode, or both. Suppress.

By suppressing the control of the arc discharge current, it is possible to reduce the interfacial deterioration due to the burning of the surfaces of the movable contact electrode or the fixed contact electrode or both of them, and extend the equipment life of the circuit breaker.

Further, the circuit breaker with the current control electrode of the present invention detects an overcurrent in the DC network in which the circuit breaker with the current control electrode is arranged, which is 1/1000 shorter than the conventional one, that is, the overcurrent is detected in nanoseconds. By arranging a current-voltage converter (overcurrent measuring device) that can detect and measure with a stand, the conventional response time (milliseconds) from the occurrence of overcurrent to the interruption of the main current can be shortened, and the movable contactor It is made more effective to reduce the interface deterioration due to the burning of the surface of the electrode or the fixed contactor electrode or both.

According to the present invention, it is possible to provide a circuit breaker with a current control electrode capable of reducing burnout deterioration of the electrode surface due to an arc discharge current at the electrode contact portion and extending the operating life time of the circuit breaker.

FIG. 1 is a circuit diagram showing a configuration of a circuit breaker with a current control electrode according to the first embodiment of the present invention, in which the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other. FIG. 2 is a circuit diagram showing the configuration of the circuit breaker with a current control electrode of the first embodiment, showing a non-contact state in which the movable contact electrode 1 and the fixed contact electrode 2 are separated from each other. FIG. 3 is an enlarged view of a main part showing the positional relationship between the movable contact electrode 1, the fixed contact electrode 2, and the current control electrode 3 in the circuit breaker with the current control electrode of the first embodiment. FIG. 4 is an enlarged view showing a cross section and a plane of a main part showing the positional relationship between the movable contact electrode 1, the fixed contact electrode 2 and the current control electrode 3 in the circuit breaker with the current control electrode of the first embodiment. Is. FIG. 5 is a diagram showing the relationship between the trigger voltage waveform of the current control electrode 3 in the circuit breaker with the current control electrode of the first embodiment and the voltage waveform applied from the lightning impulse voltage generator. FIG. 6 is a circuit configuration diagram for a verification test in which the electrical characteristics of the current control electrode 3 and the pulse generator 4 in the circuit breaker with the current control electrode of the first embodiment are verified. FIG. 7 shows a cross section and a plane of a main part showing the positional relationship between the movable contact electrode 1, the fixed contact electrode 2 and the current control electrode 3 in the circuit breaker with the current control electrode of the second embodiment of the present invention. It is an enlarged view.

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

<First Embodiment>
The configuration of the circuit breaker with the current control electrode of the first embodiment will be described with reference to the figure.
FIG. 1 is a circuit diagram showing the configuration of a circuit breaker with a current control electrode according to the first embodiment of the present invention, showing a state in which the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other. FIG. 2 is a circuit diagram showing the configuration of the circuit breaker with a current control electrode of the first embodiment, showing a non-contact state in which the movable contact electrode 1 and the fixed contact electrode 2 are separated from each other.

As shown in FIGS. 1 and 2, the circuit breaker 100 with a current control electrode of the present embodiment is a movable contact arranged so as to open (block) an arbitrary branch path in a DC electric circuit network having a DC power supply 7. The child electrode 1 and the fixed contact electrode 2, the current control electrode 3 arranged in a space different from the assumed arc discharge path in the space between the movable contact electrode 1 and the fixed contact electrode 2, and the fixed contact. A pulse generator 4 that is connected to the electrode 2 and applies a predetermined attenuated vibration voltage to the current control electrode 3 when an overcurrent occurs in the DC electric circuit network, and an overcurrent in the DC electric circuit network are detected. It has a current-voltage converter 6 and a movable contact electrode driving unit 8 that moves the movable contact electrode 1 when an overcurrent is detected in the current-voltage converter 6.

In the present embodiment, the movable contact electrode 1 and the fixed contact electrode 2 are arranged as shown below. That is, in the present embodiment, in order to cut off an arbitrary branch current of the DC network, the two nodes P1 and P2 at both ends of the branch current (the potential of the high potential connection point P2 is V2, and the potential of the low potential connection point is V2). When the potential of P1 is V1, the fixed contact electrode 2 is arranged in one node P2 (V2 ≧ V1; positive electrode for explanation), and the movable contact electrode 1 is arranged in the other node P1. ..

Here, FIG. 1 shows a state in which the DC electric network is closed, that is, a state in which the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other, and FIG. 2 shows an arbitrary state in the DC electric network. The branch path is open (blocked), that is, the movable contact electrode 1 and the fixed contact electrode 2 are separated from each other and are not in contact with each other.

The current control electrode 3 is an electrically magnetic space that has an electromagnetic effect on the arc discharge current in order to divide the arc discharge current, and is a space between the movable contact electrode 1 and the fixed contact electrode 2. More specifically, an insulating arc-extinguishing medium between the movable contact electrode 1 and the fixed contact electrode 2 (gas (eg, air, inactive gas SF6, SF6 alternative gas (including: pressurized gas), liquid). , Vacuum, etc.).

FIG. 3 is an enlarged view of a main part showing the positional relationship between the movable contact electrode 1, the fixed contact electrode 2, and the current control electrode 3 in the circuit breaker with the current control electrode of the first embodiment. , Is an enlarged view showing a cross section and a plane of a main part showing the positional relationship between the movable contact electrode 1, the fixed contact electrode 2 and the current control electrode 3 in the breaker with a current control electrode of the first embodiment.

As shown in FIGS. 3 and 4, the current control electrode 3 in the first embodiment has a ring shape surrounding a linear central axis on which the movable contact electrode 1 is movable, and in FIGS. 3 and 4, the current control electrode 3 has a ring shape. Although not shown, it is held by an insulating member. The distance between the movable contact electrode 1 and the fixed contact electrode 2 when the movable contact electrode 1 is separated from the fixed contact electrode 2 is L, and the height of the ring-shaped current control electrode 3 is L1. Then, if L1 <L, and if the inner diameter of the current control electrode 3 is r2 and the radius of the movable contact electrode 1 is r1, then there is a relationship of r2> r1.

Further, the current control electrode 3 is connected to one terminal of the output voltage of the above-mentioned pulse generator 4 that generates a high voltage damped vibration pulse by the overcurrent when an overcurrent occurs in the DC network (). (See FIGS. 1 and 2).

A conductive member is used for the current control electrode 3, and in the present embodiment, the current control electrode 3 is composed of a member equivalent to the movable contact electrode 1 and the fixed contact electrode 2. Further, as described above, the conductive current control electrode 3 is provided in a position space where the arc discharge can be electromagnetically controlled with respect to the arc discharge generated when the movable contact electrode 1 and the fixed contact electrode 2 are opened. Have been placed.

The current control electrode 3 used in the present embodiment has a ring shape with a height of L1, but the shape of the current control electrode 3 is not limited to this, and for example, the center on a straight line on which the movable contact electrode 1 is movable. A cylindrical shape surrounding the shaft, a mesh shape surrounding the central axis on the same straight line, a radiation rod shape with respect to the central axis on the same straight line, a radiation needle shape with respect to the central axis on the same straight line, and the like may be adopted.

The pulse generator 4 is connected to the other end of the fixed contact electrode 2 in the DC electric network, and the output terminal on the secondary side thereof is connected to the current control electrode 3. Then, when an overcurrent occurs in the DC electric circuit network, a predetermined trigger pulse (damped vibration voltage) is output from the secondary output terminal and applied to the current control electrode 3.

The attenuated vibration voltage output from the pulse generator 4 is a positive electrode or negative electrode voltage, or a polarity that repeats the positive electrode property and the negative electrode property.

Here, the pulse generator 4 adopted in the present embodiment is detailed in Japanese Patent No. 4595097 by the inventor of the present invention.

In the present embodiment, the trigger pulse (damped vibration voltage) applied to the current control electrode 3 is the damped vibration voltage generated by the pulse generator 4, but the present invention is not limited to this, and for example, the current. The control electrode 3 has a positive or negative voltage, or a positive and negative voltage from another power source (not shown) in synchronization with the opening / closing operation of the breaker (movable contact electrode 1 and fixed contact electrode 2). A voltage having a waveform (for example, an attenuated vibration wave voltage) may be applied (applied).

The current-voltage converter 6 is connected in series to the other end of the pulse generator 4 via the load 5 in the DC electric network. In the present embodiment, the current-voltage converter 6 can detect the overcurrent in nanoseconds when an overcurrent occurs in the DC electric network. Further, the movable contact electrode driving unit 8 is in a state where the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other when the current-voltage converter 6 detects an overcurrent (including: pulse property) (see FIG. 1). ) To the non-contact state (see FIG. 2), a drive signal for controlling the transition to the non-contact state (see FIG. 2) is output to the movable contact electrode 1.

The current-voltage converter 6 adopted in the present embodiment is disclosed in Japanese Patent No. 6030293 by the inventor of the present invention.

Further, the circuit breaker 100 with a current control electrode of the present embodiment detects an overcurrent in the DC network in which the circuit breaker 100 with a current control electrode is arranged, which is 1/1000 shorter than the conventional one, that is, overcurrent. By arranging a current-voltage converter 6 (overcurrent measuring device) that can detect and measure in the nanosecond range, the conventional response time (millisecond range) from the occurrence of the overcurrent to the interruption of the main current can be shortened. , The reduction of interface deterioration due to burning of the surfaces of the movable contact electrode or the fixed contact electrode or both of them is made more effective.

<Operation of this embodiment>
In the present embodiment, it is assumed that an overcurrent occurs in the DC network in a state where the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other (see FIG. 1). At this time, the current-voltage converter 6 can detect the overcurrent in nanoseconds, and when the overcurrent is detected in a very short time (on the order of nanoseconds) from the occurrence of the overcurrent, the movable contact electrode driving unit 8 is accompanied by this detection. Outputs a predetermined drive signal to the movable contact electrode 1.

When the movable contact electrode 1 receives the drive signal, it begins to separate from the fixed contact electrode 2, that is, from a state in which the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other (see FIG. 1) to a non-contact state (see FIG. 1). (See Fig. 2).

When the movable contact electrode 1 and the fixed contact electrode 2 are in contact with each other (see FIG. 1) to the non-contact state (see FIG. 2), the movable contact electrode 1 and the fixed contact electrode 2 are subjected to the transition. An arc discharge is generated between the two, and the arc discharge generates charged particles such as electrons, ions, and discharge deterioration products in the vicinity of the movable contact electrode 1, the fixed contact electrode 2, and the current control electrode 3.

On the other hand, the above-mentioned trigger pulse (damped vibration voltage) is output from the output terminal on the secondary side of the pulse generator 4 due to the overcurrent generated in the DC network, and this trigger pulse (damped vibration voltage) is the current control electrode 3. Is applied to. The current control electrode 3 repels or absorbs charged particles such as electrons, ions, and discharge deterioration products generated in the vicinity depending on the polarity (positive or negative) of application of the damped vibration voltage. At this time, insulation failure occurs between the movable contact electrode 1 and the current control electrode 3 and between the movable contact electrode 1 and the fixed contact electrode 2, and the current control electrode 3 receives an arc discharge current. A part of the current is induced and split, and the split current flows from the pulse generator 4 toward the ground.

In this embodiment, the time from when the trigger pulse (damped vibration voltage) is output from the pulse generator 4 until the dielectric breakdown occurs in the current control electrode 3 is as shown in the verification test result described later. It is an extremely short time (for example, about 0.2 μs when the distance between the electrodes is 0.6 m).

As described above, in terms of the electrical system, the current control electrode 3 of the present embodiment includes the movable contact electrode 1 and the fixed contact electrode 2 after a very short time after an overcurrent occurs in the DC electric network. By inducing and distributing a part of the arc discharge current generated during the period, the arc discharge current is controlled, and the arc discharge current suppresses the inflow to the movable contact electrode 1 or the fixed contact electrode 2 or both. Can be done.

That is, in the present embodiment, the arc discharge current is controlled, and the difference between the arc discharge current and the current flowing into the current control electrode flows into the movable contact electrode 1 and / or the fixed contact electrode 2 or both electrodes. It is possible to reduce surface deterioration due to burning of Joule heat on the surfaces of the movable contact electrode 1 and the fixed contact electrode 2.

FIG. 5 is a diagram showing the relationship between the trigger voltage waveform of the current control electrode 3 in the circuit breaker with the current control electrode of the first embodiment and the voltage waveform applied from the lightning impulse voltage generator. Further, FIG. 6 is a circuit configuration diagram for a verification test in which the electrical characteristics of the current control electrode 3 and the pulse generator 4 in the circuit breaker with the current control electrode of the first embodiment are verified.

The characteristic diagram of the verification test result shows the applied voltage waveform (CH1) applied to the movable contactor electrode 1 when the lightning impulse voltage (576 kV) is applied to the movable contactor electrode 1 as the power supply voltage from the lightning impulse voltage generator 17. ) And a trigger pulse waveform (CH2) indicating that a trigger pulse (decayed vibration voltage) was generated from the pulse generator 4 by the applied voltage, and a very short time (5) from the generation of the trigger pulse. In the test circuit, it indicates that dielectric breakdown occurred at 0.2 μs).

The experimental conditions were the distance between the movable contact electrode 1 and the fixed contact electrode 2: 0.6 [m], and the distance between the movable contact electrode 1 and the current control electrode 3: 0.6 [. m]. Further, as the electrode corresponding to the current control electrode 3, a rod-shaped electrode 13 was used.

From the characteristic diagram shown in FIG. 5, when a lightning impulse voltage is applied and a trigger pulse is output from the pulse generator 4 toward the current control electrode 3 at about 2.4 μs from the specified origin, electrons are generated in the vicinity thereof. It can be seen that ions and discharge deterioration products were generated, and that dielectric breakdown occurred about 2.6 μs after the origin of the specification. That is, it can be seen that dielectric breakdown occurs in about 0.2 μs after the trigger pulse is output from the pulse generator 4 toward the current control electrode 3. That is, it is demonstrated that the current control electrode 3 controlled the arc discharge current. The time axis is the main.

<Effect of embodiment>
As described above, according to the breaker 100 with a current control electrode of the present embodiment, the movable contact electrode 1, the fixed contact electrode 2, and the current control electrode 3 are provided, and when an overcurrent occurs in the DC electric network, In a breaker that cuts off branch path current by separating the movable contact electrode 1 from the fixed contact electrode 3, a part of the arc discharge current generated between the movable contact electrode 1 and the fixed contact electrode 2 is current. By suppressing, reducing or extinguishing the arc current flowing into the movable contact electrode 1 and the fixed contact electrode 2 by dividing the flow at the control electrode 3, the movable contact electrode 1 and / or the fixed contact electrode 2 of both electrodes are used. Burnout deterioration can be reduced and the operating life time can be extended.

In the present embodiment, an example of applying the circuit breaker 100 with a current control electrode to a DC electric circuit network has been shown, but the concept of the present invention is not limited to this and can be applied to an AC electric circuit network. ..

Next, a second embodiment of the present embodiment will be described.
FIG. 7 shows a cross section and a plane of a main part showing the positional relationship between the movable contact electrode 1, the fixed contact electrode 2 and the current control electrode 3 in the circuit breaker with the current control electrode of the second embodiment of the present invention. It is an enlarged view.

As shown in FIG. 7, the current control electrode 3 in the second embodiment is used to easily guide the main arc discharge path to the current control electrode 3 when the circuit is open, that is, the fixed contact electrode 2 and the movable contact electrode 2. In order to make it larger than the electric field E12 (potential gradient) between 1 and 1, a conductive protrusion 3a is provided on the inner peripheral surface of the current control electrode 3 facing the arc discharge path, and the electric field strength E1c of the protrusion 3a portion is increased. It is characterized by letting it.

The relationship between the electric field E12 and the electric field E1c is E1c >> E12.
Is.

Here, the potential gradient of the portion of the protrusion 3a described above is even higher. In the present embodiment, due to the presence of the protrusion 3a, the vicinity of the portion is ionized by the voltage applied to the current control electrode 3, and the arc can be easily guided to the current control electrode 3.

In the above-described embodiment, the current control electrode 3 controls the arc discharge current by applying a trigger pulse (damped vibration voltage) from the pulse generator 4, but the present invention is not limited to this, and the current control electrode 3 is in fixed contact with the movable contact electrode 1. Even if a configuration is adopted in which a predetermined voltage is applied from an independent power source that synchronizes with the opening of the child electrode 2 and also synchronizes with overcurrent detection to discharge (generate initial electrons, ions, and discharge deterioration products). Good.

Further, the current control electrode 3 may be configured to irradiate an electromagnetic wave such as an ultraviolet ray or a laser from the outside in synchronization with the detection of overcurrent and the opening of the movable contact electrode 1 and the fixed contact electrode 2.

By using the circuit breaker with a current control electrode according to the present invention for current cutoff, it is possible to easily cut off the overcurrent (including pulse property) that occurs at the time of short-circuit accident, ground fault, and insulation deterioration. Insulation deterioration can be reduced and work safety can be extremely improved.

Therefore, when applied to a power plant that continuously generates DC power such as photovoltaic power generation, if the modules are short-circuited for some reason or an overcurrent flows due to deterioration, each module is instantly released from the power plant. Since it can be (opened), it has the effect of minimizing the decrease in the overall power generation efficiency of the power plant.

Furthermore, in the maintenance of the power plant, it is possible to open (open) each power generation string or power generation section (configuration in which strings are connected in series, in parallel, or both), that is, the faulty section can be separated and opened, so that all power generation can be performed. It has the advantage of being able to continue to supply power with the remaining power generation strings without shutting down the plant.

Therefore, only the string in the faulty section can be replaced or repaired safely for maintenance work. It can be safely maintained and managed in the sunshine, that is, during the operation of the photovoltaic power plant.

As described above, the process of applying (applying) positive, negative, or bilateral voltage to the current control electrode of the circuit breaker with current control electrode from the power supply synchronized with the opening and closing operation of the circuit breaker. Since the synchronized power supply operations can be connected and disconnected by communication means (wireless remote operation), the solar power plant can be centrally maintained and managed by remote operation.

In the above, the power plant is described, but since these methods can be applied not only to the power plant but also to each large and small consumer (including general households), efficient cooperation operation with the power system is possible. In addition, maintenance becomes easy.

Furthermore, it can be applied to current interruption in all fields where DC power supplies are used, such as electrical engineering, communication engineering, control engineering, robot engineering, railway engineering (including magnetic levitation vehicle: linear motor car), and automobile engineering. ..

Specifically, DC current cutoff for electric railway motor vehicles, DC trunk line cutoff at substations for train railways, current cutoff for automobile power supplies, current cutoff for robot power supplies, power supply for DC motors in rolling mills, etc. It can be applied to blocking.

As can be seen from the above, it is suitable for applications that cut off (open) the current in all fields of electrical information and communication engineering that use a DC power supply. It should be noted that the pulse power supply (square wave) can be applied to any electric device (electric motor, DUTY Factor (pulse width divided by the period) having a large ratio) to be driven.

1: Movable contact electrode 2: Fixed contact electrode 3: Current control electrode 4: Pulse generator (damped vibration voltage generator)
5: Load 6: Current-voltage converter (overcurrent detector)
7: DC power supply 8: Movable contact electrode drive unit L: Distance between movable contact electrode and fixed contact electrode L1: Height of current control electrode r1: Radius of movable contact electrode r2: Current control electrode Inner diameter

Claims (1)

In a DC electric circuit, in a circuit breaker with a current control electrode connected in series with the branch path in order to cut off the branch path current of an arbitrary closed circuit.
A movable contact electrode connected to a predetermined DC power source in the branch path,
A fixed contact electrode arranged so that one end is in contact with or not in contact with the movable contact electrode.
Disposed on the assumption arc discharge path different from the space definitive between one end of the fixed contact electrode and the movable contact electrode, comprising a conductive ring-shaped having a conductive protrusion for guiding the arc discharge current With the current control electrode,
A predetermined attenuated vibration voltage is generated by a pulsed overcurrent generated in the DC electric circuit network and the primary side circuit portion on the DC electric circuit network connected in series with the other end of the fixed contact electrode. It has a secondary circuit section, and the current control electrode is connected to one end of the secondary circuit section, and a grounding section is connected to the other end of the secondary circuit section. A pulse generator capable of applying the attenuated vibration voltage generated in the secondary circuit section due to the pulsed overcurrent generated in the secondary circuit section to the current control electrode.
In the DC electric network, a current-voltage converter connected in series to the primary circuit portion of the pulse generator and detecting a pulsed overcurrent generated in the DC electric network, and a current-voltage converter.
When the current-voltage converter detects a predetermined pulsed overcurrent, the movement of the movable contact electrode is controlled so that the movable contact electrode and the fixed contact electrode shift from the contact state to the non-contact state. Movable contact electrode drive unit and
With
When the current-voltage converter detects a pulsed overcurrent generated in the DC electric network, the movable contact electrode drive unit moves and controls the movable contact electrode so as to be separated from the fixed contact electrode.
When the attenuated vibration voltage generated in the pulse generator is applied, the current control electrode has the movable contact electrode and the fixed contactor in the vicinity of the current control electrode according to the polarity of the attenuated vibration voltage. A predetermined charged particle generated by the arc discharge generated by the separation from the electrode is repelled or absorbed, and a part of the arc discharge is induced and divided and controlled through the conductive protrusion.
The pulse generator is a circuit breaker with a current control electrode, characterized in that a part of the arc discharge induced and diverted at the current control electrode flows out toward the grounding portion.

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