Space saved current sensor arrangement system in vacuum circuit breaker, and board

Abstract

To implement "improvement of space efficiency" or "space saving", etc., by arranging a current sensor in such a manner that a conductor of a vacuum circuit breaker cradle passes the inside of a substantially annular current sensor.SOLUTION: In an arrangement system 1 for arranging a current sensor 3 in a vacuum circuit breaker 2, the substantially annular current sensor 3 is arranged in conductors 2b of at least two lines among conductors 2b of three lines in a cradle 2a of the vacuum circuit breaker 2 in such a manner that the conductors 2b pass the inside of the current sensor 3 including a winding 3b which is wound around a substantially annular core 3a. A mounting part 3c extending outside from an outer peripheral side of the substantially annular current sensor 3 is mounted on an inner wall surface of the cradle 2a or conductive shield parts 4 provided on an inner peripheral side and an outer peripheral side of a winding 3b wound in the substantially annular current sensor 3 may also be grounded. In a board 10 including the arrangement system 1, the vacuum circuit breaker 2 and the current sensor 3 in a board housing 11, a plurality of vacuum circuit breakers 2 is stacked in a vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a current sensor installation system for a vacuum circuit breaker and a panel using this installation system. [Background technology]

[0002] BACKGROUND ART Electrical power receiving and transforming equipment has been known in the past (see Patent Document 1). This power receiving and transforming equipment is a cubicle-type power receiving and transforming equipment that houses equipment for receiving and transforming electricity in a housing, and the housing has an air intake and exhaust port for ventilation.The housing is provided with a liquid-resistant equipment installation area where liquid-resistant equipment that is liquid-resistant and can be washed with a cleaning liquid is installed and ventilation is performed by the ventilation device, and a non-liquid-resistant equipment installation area where non-liquid-resistant equipment that is not liquid-resistant is installed, and a liquid-tight container section that is constructed liquid-tight and contains the non-liquid-resistant equipment is provided in the non-liquid-resistant equipment installation area. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-182340 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power receiving and transforming equipment described in Patent Document 1, as shown in Figure 3 and paragraph 0032 thereof, a high-voltage vacuum circuit breaker and a high-voltage current transformer are housed within a housing. However, the high-voltage current transformer is located a predetermined distance above the high-voltage vacuum circuit breaker. Therefore, the housing requires installation space for both the high-voltage vacuum circuit breaker and the high-voltage current transformer, resulting in poor space efficiency.

[0005] In view of these points, the present invention aims to provide an arrangement system and panel that achieves "improved space efficiency" and "space savings" by arranging a current sensor so that the conductor of the vacuum circuit breaker cradle passes through an approximately annular current sensor. [Means for solving the problem]

[0006] The installation system 1 of the present invention is an installation system for installing a current sensor 3 in a vacuum circuit breaker 2, wherein the vacuum circuit breaker 2 has three conductors 2b arranged in parallel in a cradle 2a, and the current sensor 3 is approximately annular and has an approximately annular core 3a and a winding 3b wound around the core 3a, and the approximately annular current sensor 3 is installed in the cradle 2a so that at least two of the three conductors 2b pass through the approximately annular current sensor 3.

[0007] A second feature of the installation system 1 of the present invention is that, in addition to the first feature, the approximately annular current sensor 3 has an attachment portion 3c extending outward from its outer periphery, and the attachment portion 3c is attached to the inner wall surface of the cradle 2a of the vacuum circuit breaker 2.

[0008] A third feature of the installation system 1 of the present invention is that, in addition to the first or second feature, the approximately annular current sensor 3 is provided with at least a conductive shield portion 4 on the inner and outer sides of the wound winding 3b, and the shield portion 4 is grounded.

[0009] The panel 10 of the present invention is a panel having the above-mentioned installation system 1, the vacuum circuit breaker 2, and the current sensor 3 inside the panel housing 11, and its first feature is that multiple vacuum circuit breakers 2 are stacked vertically.

[0010] Due to these features, by arranging an approximately annular current sensor 3 on at least two of the three conductors 2b in the cradle 2a of the vacuum circuit breaker 2 so that the conductors 2b pass through the current sensor 3, which has a winding 3b wound around an approximately annular core 3a, unlike Patent Document 1, only installation space for the vacuum circuit breaker 2 is required within the housing of the substation equipment, and installation space for the current sensor 3 such as a current transformer is not required.As a result, space efficiency is improved by the amount of installation space for the current sensor 3 ("improved space efficiency"), and "space savings" can be achieved within the housing, etc. Furthermore, since the power distribution system 1 can save space when installing the vacuum circuit breaker 2 and the current sensor 3, it can also be said to be a "space-saving current sensor installation system for a vacuum circuit breaker."

[0011] Furthermore, by attaching the mounting portion 3c, which extends outward from the outer periphery of the approximately annular current sensor 3, to the inner wall surface of the cradle 2a, further "improvement of space efficiency" and "space saving" can be achieved, and there is no need to separately provide a mounting fixture 2aT or the like on the cradle 2a, which leads to a reduction in the number of parts.

[0012] Furthermore, by grounding the conductive shielding portion 4 provided on the inner and outer sides of the wound winding 3b in the approximately annular current sensor 3, not only can electrical influences such as electrostatic induction and electromagnetic induction from the conductor 2b passing through the approximately annular current sensor 3 be reduced, but also electrical influences such as electrostatic induction and electromagnetic induction from the conductor 2b that does not pass through the approximately annular current sensor 3 (i.e., the adjacent conductor 2b) can be reduced ("reduction of electrical influences"), and it can also be said that the detection error in the current sensor 3 can be reduced ("reduction of detection error").

[0013] In a panel 10 having an installation system 1, a vacuum circuit breaker 2, and a current sensor 3 inside a panel housing 11, a plurality of vacuum circuit breakers 2 are stacked vertically, thereby preventing the panel 10 from becoming larger despite the functionality being improved by having a plurality of vacuum circuit breakers 2 inside the panel housing 11. [Effects of the Invention]

[0014] According to the installation system of the present invention, by arranging the current sensor so that the conductor of the vacuum circuit breaker cradle passes through the approximately annular current sensor, it is possible to achieve "improved space efficiency" and "space savings." [Brief explanation of the drawings]

[0015] [Figure 1] 1A and 1B are schematic diagrams showing a side view of an arrangement system according to the present invention, in which FIG. 1A shows a current sensor in a vacuum interrupter, and FIG. 1B shows a conductor and a current sensor in the vacuum interrupter. [Figure 2] FIG. 1 is a schematic diagram showing the front of the deployment system. [Figure 3] 10 is a photograph, substituted for a drawing, showing a top view of a modified example of the arrangement system, approximately from the front. [Figure 4] 10 is a photograph, shown as a substitute for a drawing, showing a substantially front view from below of a modified example of the installation system. [Figure 5] FIG. 2 is a schematic diagram showing a side view of a board according to the present invention. [Figure 6] 10A and 10B are schematic diagrams showing a modified example of the panel, in which (a) is a side view, (b) is an internal front view, and (c) is a plan view of the current sensors arranged therein. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <Overall configuration of installation system 1> 1 to 6 show an installation system 1 according to the present invention. The distribution system 1 is a system in which a current sensor 3 (to be described later) is disposed in a vacuum circuit breaker 2 (to be described later). The power distribution system 1 includes the vacuum circuit breaker 2 and the current sensor 3. The installation system 1 (particularly the current sensor 3) may include a shield part 4, which will be described later. In addition, the "electrical circuit" in this invention is something that carries electricity (current) and is made of copper, aluminum, silver, gold, nichrome, etc., and the conductor may be covered with an insulating coating or the like, and includes the conductor 2b of the vacuum circuit breaker 2 described below, general cables and electric wires, etc.

[0017] <Vacuum circuit breaker 2> As shown in FIGS. 1 to 6, a vacuum circuit breaker (VCB) 2 is a circuit breaker that interrupts a predetermined electric circuit. The vacuum circuit breaker 2 includes a cradle 2a, which will be described later, and a conductor 2b, which will be described later. The specific configuration of the vacuum circuit breaker 2 is not particularly limited, but for example, the vacuum circuit breaker 2 may have a vacuum valve (circuit breaker body) 2c mounted on a cradle 2a, a cart 2d on which the vacuum valve 2c is placed, an operating unit 2e mounted on the cart, and an operating handle 2f for closing and tripping provided on the front of the operating unit 2e. The vacuum circuit breaker 2 may be used to prevent a secondary accident, and may also be grounded to a ground metal 11f of the panel housing 11, which will be described later. The short-circuit capacity of the vacuum circuit breaker 2 is not particularly limited either, but its upper limit may be, for example, 100 kA or less, preferably 50 kA or less, and more preferably 30 kA or less, and its lower limit may be, for example, 1 kA or more, preferably 3 kA or more, and more preferably 5 kA or more (8 kA, 12.5 kA, 20 kA, etc.). Note that each lower limit of the short-circuit capacity may be combined with any of the upper limits.

[0018] <Cradle 2a> As shown in Figures 1 to 6, the cradle (cradle-shaped stand) 2a is a member on which the vacuum valve 2c of the vacuum circuit breaker 2 described above can be mounted (built-in), and can also be said to be the housing of the vacuum circuit breaker 2, so to speak. The specific configuration of the cradle 2a is not particularly limited, but may, for example, have a plate body that is approximately trapezoidal in side view (see Figures 1, 3 to 5), although this plate body is not essential.In addition, since the cradle 2a is also a cradle-shaped stand, it may also be a support material or base that supports the vacuum circuit breaker 2 itself (see Figure 6 in particular). Therefore, in the present invention, "three-wire conductors 2b arranged in parallel in the cradle 2a" includes not only three-wire conductors 2b arranged in parallel inside the cradle 2a, but also three-wire conductors 2b attached to the cradle 2a, which is a support material or base, and arranged in parallel. It can also be said that the cradle 2a has a frame 2aW in which the three conductors 2b are arranged in parallel. The current sensor 3 described later is attached to such a cradle 2a (for example, via an attachment portion 3c), but the attachment method is not particularly limited, and for example, the attachment portion 3c may be attached to an attachment surface (cradle attachment surface) 2aM, in which case the cradle attachment surface 2aM may be, for example, the upper surface of an approximately plate-shaped attachment fixture 2aT provided on the cradle 2a (see Figures 1, 2, and 5), the inner wall surface of the cradle 2a (for example, the inner surface of an approximately trapezoidal plate, see Figures 3 and 4), or the rear end surface of the cradle 2a, which is a support material or base (see Figure 6).

[0019] <Conductor 2b> As shown in FIGS. 1 to 6, the conductors 2b are electric circuits arranged in parallel in the above-mentioned cradle 2a, and each set includes three wires (three pieces). The conductor 2b may be a long, approximately plate-shaped bus (also called a BUS) among the above-mentioned electrical circuits S, and may be made of copper, aluminum, etc., without being coated with an insulating material or the like. The three-wire conductor 2b is not particularly limited, but may be, for example, a three-phase three-wire (3φ3W) circuit like the system, through which a current (AC current) with a voltage of 6600V, 22000V, 3300V, etc. and a frequency of 60Hz or 50Hz, etc., flows.

[0020] <Current sensor 3> As shown in Figures 1 to 6, the current sensor 3 is a sensor that is attached to the above-mentioned specified electrical path S and outputs a current (sensor current) corresponding to the current in the specified electrical path S, and may have a sensor electrical path 3A described later. The current sensor 3 has a substantially annular shape and includes a core 3a (to be described later) and a winding 3b (to be described later), and can be said to be a coil member. In addition, the current sensor 3 may have an attachment portion 3c described later, a shield portion 4 described later, an encapsulating portion 5 and a cushion portion 6 described later, and may also have a measuring portion (not shown), a correction portion (not shown), a relay portion (not shown) described later, and other output portions (not shown) that output to the control portion of the power plant via a wired communication cable or wirelessly.

[0021] The rated range of the current detected by the current sensor 3 is not particularly limited, but the upper limit may be, for example, 1800 A or less, preferably 1650 A or less, and more preferably 1500 A or less, and the lower limit may be, for example, 1 A or more, preferably 5 A or more, and more preferably 10 A or more. Note that each lower limit of the rated range of the current to be measured may be combined with any of the upper limits. Here, the "rated range of the current to be detected" in the present invention refers to the range of the rated current, and the "rated current" can also be said to be the limit value of the current guaranteed by the manufacturer for the safe use of an electrical appliance, and further, the "rating" can also be said to be the usage limit or condition under which the safe and proper operation of an appliance or device is guaranteed. In the present invention, the "value of current (current value)" refers to an effective value. Furthermore, the maximum value of the range of current actually flowing through current sensor 3 may be 10 to 20 times the maximum value of the rated range of current described above (for example, 40,000 A, 36,000 A, 30,000 A, etc.), and the minimum value of the range of current actually flowing through current sensor 3 may be 0 A. Next, the core 3a and the winding 3b will be described below.

[0022] <Core 3a> As shown in Figures 1 to 6 (particularly Figure 1), core 3a can also be said to be an approximately annular iron core member (magnetic core member), and the shape of core 3a may be approximately circular annular in plan view (i.e., approximately circular cylindrical or approximately ring-shaped, etc.); in this case, it may be strictly circular annular in plan view, or may be slightly elliptical annular in plan view. Alternatively, the shape of the core 3a may be an approximately rectangular ring when viewed in a plane (not shown). In this case, the core 3a may be an approximately rectangular ring when viewed in a plane (i.e., an approximately rectangular ring) having a pair of approximately parallel and opposing long sides and a pair of approximately parallel and opposing short sides, or an approximately rectangular ring when viewed in a plane (i.e., an approximately square ring) having all four sides of equal length (and two pairs of opposing sides). The cross-sectional shape of the substantially annular core 3a may be, for example, substantially rectangular (substantially rectangular or substantially square), or may be substantially circular, substantially elliptical, or substantially triangular.

[0023] There may be only one core 3a for one current sensor 3, but there may also be multiple cores 3a.If there are multiple cores 3a, the current sensor 3 may be equipped with a fixing device that fixes the multiple cores 3a together. The material of the core 3a may be silicon steel such as oriented silicon steel or ultra-thin silicon steel, electromagnetic steel, dust material such as iron dust, sendust, or permalloy, ferrite material, amorphous, Finemet (registered trademark), etc. The core 3a may be formed by laminating a plurality of thin plates, and in this case, the laminated plurality of thin plates may be bonded to each other with an adhesive, etc. Also, a coating (film) for rust prevention, insulation, etc. may be formed on the surface of the core 3a.

[0024] <Winding 3b> As shown in FIGS. 1 to 6 (particularly FIG. 1), winding 3b is an electric circuit wound around core 3a, and can also be said to be the portion (winding portion 3b) that covers core 3a. The winding 3b can also be considered an electric wire, and its material can be any material or type of wire that can carry an electric current, such as polyurethane copper wire (UEW), polyester copper wire (PEW), polyamideimide copper wire (AIW), or other copper, nichrome wire, silver, gold, aluminum, or the like. The diameter of the wound wire 3b is not particularly limited, but may be 0.1 mm to 10.0 mm, preferably 0.2 mm to 5.0 mm, and more preferably 0.3 mm to 1.0 mm (such as 0.6 mm). The number of times that the winding 3b is wound (number of turns) is not particularly limited, but the upper limit may be, for example, 50,000 turns or less, preferably 25,000 turns or less, more preferably 10,000 turns or less, and even more preferably 2,000 turns or less (e.g., 750 turns or 1,000 turns), and the lower limit may be, for example, 10 turns or more, preferably 100 turns or more, more preferably 300 turns or more, and even more preferably 500 turns or more. Note that each lower limit for the number of turns of the winding 3b may be combined with any of the upper limits.

[0025] Furthermore, when a plurality of windings 3b are provided around the core 3a of one current sensor 3, the number of turns of each winding 3b may be the same or different. Furthermore, since the number of turns of the winding 3b around the core 3a (if there is one winding 3b, it is the number of turns of that winding 3b, and if there are multiple windings 3b, it is the total number of turns of the multiple windings 3b), the specified electrical circuit S to be measured can be said to have one turn, the current transformation ratio between the primary side (the side of the specified electrical circuit S) and the secondary side (the side of the output (sensor electrical circuit 3A) from the current sensor 3) of the current sensor 3 is the number of turns of the winding 3b in the current sensor 3 relative to the number of turns of the specified electrical circuit S, which is 1 (i.e., 1: number of turns of the winding 3b in the current sensor 3).

[0026] When winding this winding 3b, a winding machine such as a spindle type winding machine, a flyer type winding machine, or a trace alignment winding machine may be used, or it may be manually wound. When winding in an aligned manner using a winding machine, a certain amount of tension must be applied to the winding 3b to keep the winding 3b taut in order to achieve neat, aligned winding. Therefore, the winding 3b at the beginning and end of the winding may be temporarily secured with tape or may be hooked onto the above-mentioned retaining pin. From the winding 3b wound in this manner, one end and the other end (i.e., the start and end of the winding, so to speak) of the winding may protrude as lead wires or the like, or the two wound windings 3b may be connected in series by connecting (establishing electrical continuity) one end or the other end (or one end and the other end) of each winding with screws or the like. Alternatively, the winding 3b wound a predetermined number of times around the core 3a may be covered with a cushion portion 6, which will be described later, and another winding 3b may be wound over the cushion portion 6 (i.e., the cushion portion 6 may be sandwiched between the windings 3b). Each of the two wound windings 3b connected in series may be provided with a round or open-ended connection terminal at the end that is not connected to each other, and these connection terminals may be color-coded, for example, red and blue.

[0027] <Sensor circuit 3A> As shown in Figures 1 to 6 (particularly Figures 1 and 2), the sensor circuit 3A is an electric circuit that outputs the current (sensor current) output from the current sensor 3, and may be two electric wires (k, l (lowercase L), secondary wires) that are conducted to one end and the other end (i.e., the start and end of the winding) of the above-mentioned winding 3b. The sensor circuit 3A may be connected to the measurement unit via a variable resistor (varistor). The sensor circuit 3A does not have to be grounded, but may be grounded instead. The value of the current flowing through this sensor circuit 3A and output from the current sensor 3 does not need to be particularly limited, but is also related to the current transformation ratio between the primary and secondary sides of the current sensor 3 described above (i.e., the number of turns of the winding as a whole of the current sensor 3 (if there is one wound winding 3b, this is the number of turns of that winding, and if there are multiple wound windings 3b, this is the total number of turns of the multiple windings 3b)), and may be, for example, 1 A or less.

[0028] That is, the output current is not particularly limited, and its upper limit may be, for example, 2 A (2000 mA) or less, preferably 1000 mA or less, more preferably 500 mA or less, and even more preferably 100 mA or less, and its lower limit may be, for example, 0.01 mA or more, preferably 0.10 mA or more, more preferably 0.20 mA or more, and even more preferably 0.30 mA or more (such as several hundred mA, several tens of mA, or 1 mA to 50 mA). Note that each lower limit of the output current may be combined with any of the upper limits. It can also be said that the measurement unit measures the value of the current flowing in the predetermined electrical path S that is the measurement target based on the value of the current flowing in this sensor electrical path 3A.

[0029] <Mounting part 3c> 1 to 6, the mounting portion 3c is a portion that extends (is extended) outward from a portion of the outer periphery of the above-described substantially annular current sensor 3, and can also be said to be a part of the encapsulation portion 5 described below. If the cradle mounting surface 2aM to which the mounting portion 3c is attached is the upper surface of the above-described mounting fixture 2aT, the extending direction of the mounting portion 3c is upward (see FIGS. 1, 2, and 5), if it is the inner wall surface of the cradle 2a, the extending direction of the mounting portion 3c is substantially horizontal outward to the left and right (see FIGS. 3 and 4), or if it is the rear end surface of the cradle 2a, which is a support material or base, the extending direction is substantially horizontal outward to the rear (see FIG. 6). The length (extension length) of the mounting portion 3c is such that the three-wire (R phase, S phase, T phase) conductors 2b at a predetermined height from such a cradle mounting surface 2aM pass through the current sensor 3, and the inner diameter of the current sensor 3 (including the encapsulating portion 5 described below, etc.) is a value (e.g., at least 18 mm, 20 mm, 25 mm, etc.) that is a predetermined distance or more from the conductors 2b that pass through the approximately annular current sensor 3, and the outer diameter of the current sensor 3 (including the encapsulating portion 5, etc.) is a value (e.g., at least 22 mm, 25 mm, etc.) that is a predetermined distance or more from another conductor 2b that does not pass through the approximately annular current sensor 3 (outside the approximately annular current sensor 3). Due to the extension length of the mounting portion 3c and the outer and inner diameters of the current sensor 3, it can also be said that the power distribution system 1 is arranged in a cradle 2a of the vacuum circuit breaker 2 described later, with the approximately annular current sensor 3 so that the conductors 2b pass through the approximately annular current sensor 3 for at least two of the three conductors 2b described later.

[0030] The specific configuration of the attachment portion 3c is not particularly limited, but the shape thereof may be, for example, a substantially rectangular parallelepiped or cubic shape extending from the outer periphery of the substantially annular current sensor 3. In the following description, the shape of the attachment portion 3c will be mainly described as being substantially rectangular parallelepiped. The mounting portion 3c may have secondary terminals of the two wires (k, l) that make up the sensor circuit 3A from the current sensor 3 (these secondary terminals can also be considered part of the sensor circuit 3A), a ground terminal such as the shield wire 4a (shield earth, E) of the shield portion 4 described below (this ground terminal can also be considered part of the shield wire 4a), or test terminals (kt, lt) installed thereon. The locations where these terminals are installed are not particularly limited, and may be the bottom surfaces of recesses (terminal recesses) 3d on both sides (upper and lower sides, or front and rear sides) of the lower part of the approximately rectangular parallelepiped mounting part 3c. The terminal recesses 3d have a predetermined depth, left and right width, and top and bottom width, and the centers of the terminals arranged on the bottom surface thereof are at a predetermined distance from the surface 2aM of the cradle 2a to which the mounting part 3c is attached (the above-mentioned cradle mounting surface).

[0031] Furthermore, the mounting portion 3c may have a fixing means for fixing the mounting portion 3c to the cradle mounting surface 2aM, and for example, fixing means (or fixing screws or screw holes for screwing the fixing screws, etc.) 3e may be provided in multiple locations (for example, four locations) on the bottom surface (the surface on the cradle mounting surface 2aM side) of the approximately rectangular parallelepiped mounting portion 3c, and the four fixing means 3e are at a predetermined depth and at predetermined left-right or front-to-back intervals. In addition, the mounting portion 3c may be provided with a recess (test winding recess) 3f that is approximately cross-shaped in plan view and extends vertically upward from the bottom surface of the approximately rectangular parallelepiped mounting portion 3c in order to wind a winding (winding for primary input) for testing, and a protrusion (test winding protrusion) 3g that gently protrudes vertically upward on the inner periphery of the current sensor 3 (enclosure portion 5) and is approximately vertically opposite the test winding recess 3f. In particular, since the test winding recess 3f is approximately cross-shaped, even when the mounting portion 3c is attached to the cradle mounting surface 2aM, the upper and lower sides (or front and rear sides) of the mounting portion 3c are open by a predetermined width, and the left and right sides of the mounting portion 3c are also open by a predetermined width.As a result, the mounting portion 3c can be said to be fixed to the cradle mounting surface 2aM in the form of four legs, and the test winding recess 3f has a predetermined depth.

[0032] <Shield part 4> As shown in Figures 1 to 6 (particularly Figure 1(b)), the shield portion 4 is a conductive member provided at least on the inner and outer sides of the winding 3b wound around the core 3a in the current sensor 3 described above, and this shield portion 4 is grounded. In addition, in the present invention, "the shield portion 4 is provided at least on the inner and outer peripheral sides of the winding 3b wound around the core 3a of the current sensor 3" includes not only the case where the shield portion 4 is provided on the inner and outer peripheral sides of the winding 3b wound around the core 3a of the current sensor 3, but also the case where the shield portion 4 is provided on the outer peripheral side, upper side and / or lower side of the winding 3b wound around the core 3a of the current sensor 3. Furthermore, in the present invention, the terms "inner side," "outer side," "upper side," and "lower side" refer to the inner surface side, outer surface side, upper surface side, and lower surface side if the cross-sectional shape of the current sensor 3 is angular (such as approximately rectangular), and refer to the inner surface portion, outer surface portion, upper surface portion, and lower surface portion if the cross-sectional shape of the current sensor 3 is rounded (such as approximately circular or approximately elliptical).

[0033] The specific configuration of the shielding section 4 is not particularly limited, but for example, copper tape may be placed between the current sensor 3 (the winding (winding section) 3b wound to cover the core 3a) and the encapsulating section 5 or cushion section 6 described below, and the copper tape may cover the inner and outer peripheral sides of the winding section 3b. The shape of the shielding section 4 is also not particularly limited, but for example, if it is a tape-like material as described above, it may be wrapped around the inner peripheral side of the winding section 3b in the inner peripheral direction, or around the outer peripheral side in the outer peripheral direction, or the upper and lower sides may be covered with multiple tape-like materials. Alternatively, the shielding section 4 may be layered or a braided strand, etc. The material of the conductive shield portion 4 may be, for example, a metal such as copper, aluminum, tin, or tin-plated soft copper, or may be a conductive polymer.

[0034] Furthermore, the conductive shield section 4 may have a shield wire 4a that is electrically connected to the shield section 4, and the shield section 4 may be grounded by grounding this shield wire 4a. The specific configuration of the shield wire 4a is not particularly limited. For example, if the inner circumferential side and other sides (outer circumferential side, upper side, lower side) of the winding portion 3b are covered with multiple copper tapes, the shield wire 4a may be an electric wire (ground, secondary side wire) that is electrically connected to one of the multiple copper tapes as long as the copper tapes are in contact with each other and are electrically connected. Alternatively, if the shield portion 4 is made of a single copper tape or the like that covers both the inner circumferential side and the outer circumferential side, the shield wire 4a may be electrically connected to only one end (one end) of the shield portion 4. In this case, the shield wire 4a is grounded, making the shield portion 4 one-ended grounded. Furthermore, if the inner circumferential side and the outer circumferential side are covered with a single copper tape or the like, the shield wire 4a may be present at both ends of the shield portion 4. In this case, the shield wire 4a is grounded, making the shield portion 4 both-end grounded.

[0035] <Enclosure 5> 1 to 6, the encapsulating portion 5 is a portion in which the current sensor 3 described above is encapsulated in synthetic resin, and can also be considered a molded portion. The encapsulating portion 5 may be integrated with the mounting portion 3c described above, and can also be considered a coil housing. The synthetic resin that is the material of the encapsulation portion 5 is not particularly limited, but may be, for example, epoxy (EP) resin, silicon (Si) resin, polyurethane (PU) resin, etc., and these synthetic resins are poured around the core 3a of the current sensor 3, the winding (winding portion) 3b, and the shield portion 4 and allowed to harden. Such an encapsulation portion 5 improves the protection, electrical insulation, heat resistance, and environmental resistance of the core 3a, winding portion 3b, and shield portion 4, and by protecting the core 3a, winding portion 3b, and shield portion 4 from influences and damage from the external environment, it can be said that reliability and lifespan are also improved. Furthermore, when the core 3a, winding portion 3b, and shield portion 4 are encapsulated in synthetic resin (this can also be called molding processing), the synthetic resin may be vacuum degassed to prevent air bubbles from forming in the synthetic resin, and this vacuum degassing can also be said to make the synthetic resin approximately uniform.

[0036] The shape of the encapsulating portion 5 is not particularly limited, but it may be, for example, approximately cylindrical (like rolled up duct tape), approximately annular, or approximately ring-shaped. Even if the surfaces of the current sensor 3 or the shielding portion 4 are slightly uneven or have rounded corners, the encapsulating portion 5 after encapsulation can have uniform curved surfaces (side surfaces) on the inner and outer sides, and flat surfaces (planar surfaces) on the upper and lower sides. In addition, the shape of the encapsulated portion 5 may have one or more grooves 5a formed on its upper or lower side (or front or rear side) approximately along the circumferential direction, and the encapsulated portion 5 from the bottom of the groove 5a to the winding portion 3b of the encapsulated current sensor 3, etc., has a predetermined thickness. Furthermore, the thickness from the inner periphery of the encapsulated portion 5 to the inner periphery of the winding portion 3b etc. encapsulated inside may be thicker than the thickness from the outer periphery of the encapsulated portion 5 to the outer periphery of the winding portion 3b etc. encapsulated inside (for example, the thickness of the encapsulated portion 5 on the inner periphery is 6 mm or more and the thickness of the encapsulated portion 5 on the outer periphery is 4 mm or more), or may be approximately equal or thinner.

[0037] <Cushion part 6> As shown in Figures 1 to 6 (particularly Figure 1(b)), the cushion portion 6 is a cushioning member provided between the above-mentioned encapsulation portion 5 and the winding portion 3b of the current sensor 3, etc., or inside the current sensor 3. The specific configuration of the cushion portion 6 is not particularly limited, and for example, the cushion portion 6 may be provided only between the inner circumferential side of the winding portion 3b, etc. and the enclosed portion 5 (all or part of the circumferential direction of the current sensor 3) between the enclosed portion 5 and the winding portion 3b, etc. of the current sensor 3 (see FIG. 1(b)), or the cushion portion 6 may be provided between the inner circumferential side and the outer circumferential side of the winding portion 3b, etc. of the current sensor 3 (all or part of the circumferential direction of the current sensor 3), or at least one of the upper and lower sides, and the enclosed portion 5. Alternatively, as described above, the cushion portion 6 may be provided inside the current sensor 3 between the windings 3b, or between the core 3a and the winding 3b. The material of the cushion portion 6 is not particularly limited, but may be, for example, a foamed synthetic resin such as polyurethane (PU) resin, polyethylene (PE) resin, polypropylene (PP) resin, or polystyrene (PS) resin, or may be a rubber sheet, or a fabric such as a nonwoven fabric, woven fabric, or knitted fabric, or a textile product. Other parts (a measuring part, a correcting part, and a relaying part) that the current sensor 3 may have will be mentioned below.

[0038] <Measurement unit, correction unit, relay unit> The measurement unit is a part that measures at least the value of the current in a predetermined electrical path S based on the current output from the current sensor 3 via the sensor electrical path 3A. The measurement unit may also include a correction unit, which will be described later. The configuration of the measurement unit is not particularly limited, but may include, for example, an A / D converter, a CPU (central processing unit) that calculates and processes the A / D converted current value output from the current sensor 3, memory, and an LCD (liquid crystal display) described below.In addition, the measurement unit may include an auxiliary CT (auxiliary current transformer) between the current sensor 3 and the A / D converter or CPU, or conversely, it may not include an auxiliary CT. In addition, the measurement unit measures at least the value of the current in a specified electrical circuit S. In addition to the current value, if the measurement unit is also connected to the low-voltage side of an instrument transformer in a grid interconnection panel, it may also measure the voltage and power values ​​in the specified electrical circuit S, as well as reactive power, power factor, electric energy, reactive energy, etc. Additionally, the measurement unit may measure the frequency of AC current at a predetermined power or the zero-phase current.

[0039] The correction unit is provided in the measurement unit described above, and is a part that corrects the value of the current in the predetermined electrical path S measured by the measurement unit based on the current output from the current sensor 3 described above. Since the current value (detected value) output from the current sensor 3 tends to be smaller than the reference value, the correction unit may perform a correction such that, within the range in which this small value occurs, the value measured by the measurement unit is set to a value corresponding to the ratio error. Here, for the range in which the detection value from the current sensor 3 is smaller than the reference value, the above-mentioned correction may be performed, for example, in the entire range except for the range in which the detection error is 0%, but it is also possible to perform a correction in which the value measured by the measurement unit is a value corresponding to the relative error only when the detection error is below a predetermined value. Alternatively, the correction by the correction unit may be a correction in which the value obtained by linearly scaling the detected value is used as the value measured by the measurement unit. The correction unit is not particularly limited in configuration, but for example, the correction by the correction unit may be calculated and processed by the CPU in the measurement unit described above, and can also be considered software.

[0040] The relay unit is a part that performs relay operation according to values ​​(such as current values) in a specified electrical circuit S measured by the above-mentioned measurement unit, and when the current sensor 3 has a relay unit, it can also be said to have a relay function. In addition, in the present invention, "relay operation" means, for example, in a power plant, an operation of interrupting an electric circuit from the power generation plant to the grid via a signal using a circuit breaker, or, if the power generation plant has a power conditioner (a power conditioner that converts direct current or alternating current into alternating current), stopping the conversion of the power conditioner. The relay unit is not particularly limited in its configuration, and may be, for example, a contact type (electromagnetic type) using an electromagnet, or a contactless type using a semiconductor element.Furthermore, if it is an electromagnetic type, it may be, for example, a make type (an a-contact that closes when current is passed through the electromagnet), a break type (a-contact that opens when current is passed through the electromagnet), a transfer type (a-contact that switches multiple contacts by passing current through the electromagnet), a ratchet type (a contact that switches the contact open and closed each time current is passed through the electromagnet), or any other configuration, such as a polarized relay type in which a permanent magnet is provided in parallel with the electromagnet. The panel 10 using the power distribution system 1 described above will be described below.

[0041] <Panel 10> As shown in Figures 5 and 6, the panel 10 has the above-mentioned distribution system 1, and since this distribution system 1 includes a vacuum circuit breaker 2 and a current sensor 3, the panel 10 also has a vacuum circuit breaker 2 and a current sensor 3. In particular, one or more vacuum circuit breakers 2 may be included in one panel 10, and if there are multiple vacuum circuit breakers 2 (for example, two or three), these vacuum circuit breakers 2 are stacked vertically (this can also be said to be layered, such as two-tiered, three-tiered, or multiple-tiered). In the following description, it is assumed that one panel 10 has a plurality of vacuum circuit breakers 2 . Note that a single panel 10 may have a plurality of current sensors 3 (see FIG. 5) or only one current sensor 3 (see FIG. 6). Also, the conductors 2b (electrical circuits S) from a plurality of vacuum circuit breakers 2 may be connected together (see FIG. 5). The power distribution system 1, the vacuum circuit breaker 2, and the current sensor 3 are provided inside a panel housing 11, which will be described later.

[0042] The specific configuration of such a board 10 is not particularly limited, but may be, for example, a system interconnection board such as a power distribution board, a power selling board, a power receiving board, or a power purchasing board, or may be a board for other purposes. The panel 10 may have devices other than the vacuum circuit breaker 2 and current sensor 3 described above. For example, as shown in FIG. 6, the panel 10 may have a disconnecting switch (DS) 10a, a voltage transformer (VT) 10b, a voltmeter (VM-R) 10c, a CVT cable 10d, a cable head (CH) 10e, a zero-phase potential device (ZPD) 10f, and a zero-phase current transformer (ZCT) 10g. In addition, panel 10 may have a transformer, power fuse (PF), circuit protector (CP), synchronism detector, digital multimeter (with reverse power relay (RPR) and over voltage ground relay (OVGR) functions), autotransformer, uninterruptible power supply (UPS), fuse (F), voltmeter change over switch (VS), ammeter, ammeter change over switch (AS), and wattmeter, all of which are not shown, and panel 10 may be grounded to type B (EB) from the transformer or type D (ED) via a disconnect terminal and resistor.

[0043] <Disc Cabinet 11> As shown in Figures 5 and 6, the panel housing 11 is a housing that houses the above-mentioned installation system 1, vacuum circuit breaker 2, and current sensor 3, and may also house other devices such as a disconnector 10a, an instrument transformer 10b, a voltmeter 10c, a CVT cable 10d, a cable head 10e, a zero-phase voltage detector 10f, and a zero-phase current transformer 10g inside. The specific configuration of the panel housing 11 is not particularly limited, but may be formed, for example, in a substantially rectangular parallelepiped or cubic shape as a whole, and may also be called a cubicle. In the following description, the panel housings 11 will be mainly described as being substantially rectangular parallelepiped. The panel housing 11 may have one or more doors 11a that can be opened and closed (such as two double doors or one side-opening door). Furthermore, the top surface (top plate or roof) 11b of the panel housing 11 may be tilted backward. In order to stack multiple vacuum circuit breakers 2 vertically in such a panel housing 11, each vacuum circuit breaker 2 may be attached to the panel housing 11 via the above-mentioned support material, base, or stand, and these support materials can also be said to be included in the above-mentioned cradle 2a. The panel housing 11 may also have a partition plate 11c, a partition opening 11d that allows communication between the front and rear of the partition plate 11c, or a housing opening 11e that allows communication with the outside of the panel housing 11. Furthermore, the panel housing 11 may have a grounded metal 11f for grounding the vacuum circuit breaker 2, etc., and may also have a protective cover, an intake port, an exhaust port, an intake and exhaust port, etc.

[0044] <Other> The present invention is not limited to the above-described embodiment. The individual components of the installation system 1, the panel 10, etc., or the overall structure, shape, dimensions, etc., can be modified as appropriate in accordance with the spirit of the present invention. The current sensor 3 does not have to have the mounting portion 3c, in which case the complete, substantially annular current sensor 3 may be mounted to the cradle 2a via a mounting means that clamps it in a concave shape. Even if the current sensor 3 has the mounting portion 3c, it does not have to be mounted on the inner wall surface (cradle mounting surface) 2aM of the cradle 2a of the vacuum circuit breaker 2. In this case, As described above, the mounting portion 3c of the current sensor 3 may be mounted at any location on the cradle 2a, such as the upper surface of the mounting fixture 2aT of the cradle 2a, the rear end surface of the cradle 2a which is a support material, or any surface of the frame body 2aW which arranges the three conductors 2b in parallel in the cradle 2a, which may be used as the cradle mounting surface 2aM, or any surface of the vacuum valve 2c or cart 2d in the vacuum circuit breaker 2, or the rear surface of the operating unit 2e. The current sensor 3 does not necessarily have to have the shield portion 4, and furthermore, the encapsulation portion 5 and the cushion portion 6 do not necessarily have to be included.

[0045] The shield part 4 does not have to be grounded. The panel 10 may have only one vacuum circuit breaker 2, and even in this case, the approximately annular current sensor 3 may be arranged in the cradle 2a of the vacuum circuit breaker 2 so that the conductors 2b of at least two of the three conductors 2b pass through the approximately annular current sensor 3. Even if the panel 10 has a plurality of vacuum circuit breakers 2, the plurality of vacuum circuit breakers 2 do not have to be stacked vertically. In this case, the plurality of vacuum circuit breakers 2 may be arranged in a front-to-back or left-to-right (substantially horizontal) direction, or may not be adjacent to each other (not stacked or arranged side by side). Even in this case, the substantially annular current sensor 3 may be disposed in the cradle 2a of the vacuum circuit breaker 2 so that at least two of the three conductors 2b pass through the substantially annular current sensor 3, but at least one current sensor 3 may be disposed at a position away from the cradle 2a of the vacuum circuit breaker 2. Furthermore, at least one of the plurality of vacuum circuit breakers 2 included in the panel 10 may be used to prevent a secondary accident. [Industrial Applicability]

[0046] The installation system and panel of the present invention can be used for solar power generation systems and the like, regardless of the amount of power generated or their scale, and can be used as an ammeter, etc., in systems other than solar power generation systems that generate power using generators (AC motors, etc.) rotated by wind, water, wave, geothermal, etc., regardless of the magnitude of the current value in the electrical circuit being measured.In addition to the above-mentioned distribution boards, power selling boards, power purchasing boards and other grid-connected boards, the system can also be used for extra-high voltage boards (extra-high equipment), high voltage boards (high voltage equipment), low voltage boards (low voltage equipment), monitoring boards (monitoring equipment), control boards (control equipment), substation boards (transformation equipment), equipment for buildings and condominiums, and all power plants that do not generate power, such as power receiving boards and lighting distribution boards, and can be used both indoors and outdoors. [Explanation of symbols]

[0047] 1. Delivery system 2. Vacuum circuit breaker 2a Cradle 2b conductor 3 Current Sensor 3a Core 3b winding 3c Mounting part 4 Shield section 10 discs 11 Panel Case

Claims

1. An installation system for installing a current sensor (3) in a vacuum circuit breaker (2), comprising: The vacuum circuit breaker (2) has three conductors (2b) arranged in parallel in a cradle (2a), The current sensor (3) is substantially annular and has a substantially annular core (3a) and a winding (3b) wound around the core (3a), An arrangement system characterized in that an approximately annular current sensor (3) is arranged in the cradle (2a) for at least two of the three conductors (2b) so that the conductors (2b) pass through the approximately annular current sensor (3).

2. The substantially annular current sensor (3) has a mounting portion (3c) extending outward from its outer periphery, 2. The installation system according to claim 1, wherein the mounting portion (3c) is attached to an inner wall surface of a cradle (2a) of the vacuum circuit breaker (2).

3. The substantially annular current sensor (3) is provided with at least a conductive shield portion (4) on the inner and outer circumferential sides of the wound winding (3b), 2. The system according to claim 1, wherein the shield (4) is grounded.

4. A panel having the installation system (1) according to any one of claims 1 to 3, the vacuum circuit breaker (2), and the current sensor (3) inside a panel housing (11), The panel is characterized in that a plurality of the vacuum circuit breakers (2) are stacked vertically.

Images