WO2017126486A1 - Transformateur pour disjoncteur - Google Patents

Transformateur pour disjoncteur Download PDF

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Publication number
WO2017126486A1
WO2017126486A1 PCT/JP2017/001322 JP2017001322W WO2017126486A1 WO 2017126486 A1 WO2017126486 A1 WO 2017126486A1 JP 2017001322 W JP2017001322 W JP 2017001322W WO 2017126486 A1 WO2017126486 A1 WO 2017126486A1
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WO
WIPO (PCT)
Prior art keywords
circuit
transformer
coil
breaker
primary coil
Prior art date
Application number
PCT/JP2017/001322
Other languages
English (en)
Japanese (ja)
Inventor
島津　英一郎
貴之 小田
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2017126486A1 publication Critical patent/WO2017126486A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • 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
    • H02H3/087—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 for dc applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/103—Magnetic circuits with permanent magnets

Definitions

  • the present invention relates to a transformer for making it possible to use a circuit breaker for short-circuit protection in a DC circuit, and more particularly to a transformer that operates a circuit breaker while functioning as a current limiting device.
  • the present invention relates to a transformer that can effectively use a circuit breaker having a feature that the time until the circuit breaks is shortened as the value of the current flowing through the relay unit of the circuit breaker increases.
  • Patent Literature 1 when using a circuit breaker as a protective device, in order to prevent the inrush current due to a short circuit from exceeding the rated current of the circuit breaker, a method of suppressing an increase in current due to a short circuit by connecting an inductor called a current limiting coil in series are known (for example, Patent Literature 1 and Non-Patent Literature 1).
  • An object of the present invention is to provide a transformer for a breaker circuit capable of breaking a circuit by operating a breaker instantaneously when an overcurrent such as a short circuit occurs.
  • a transformer for a breaker circuit is a primary circuit provided by being connected in series or in parallel with the contact to a main circuit composed of a DC circuit provided with the contact of a circuit breaker that opens and closes a contact with an electromagnet.
  • a secondary coil provided in series with the electromagnet coil in a secondary circuit provided with a coil and an electromagnet coil for exciting the electromagnet of the circuit breaker, and from a current value flowing through the primary coil
  • the turn ratio of the primary coil and the secondary coil is set so that the value of the current flowing through the secondary coil becomes large.
  • the primary coil of the circuit breaker transformer is provided in the main circuit, the secondary coil is connected to the electromagnet coil of the circuit breaker, and the current flowing in the secondary coil is greater than the current value flowing in the primary coil.
  • the turn ratio of the primary coil and the secondary coil is set so that the value becomes large. For this reason, electric power corresponding to a large current change generated in the main circuit due to the short circuit is supplied to the electromagnet coil of the circuit breaker via the breaker circuit transformer.
  • the current value caused by the short circuit generated in the primary coil is further increased by supplying current to the electromagnet coil by changing the current in the transformer for the breaking circuit.
  • blocking speed improves and a circuit breaker can be operated before a short circuit current becomes large too much. As a result, the influence of the inrush current on various devices on the primary side main circuit can be suppressed low.
  • a circuit breaker can be used safely as a substitute for a fuse as a protective device for a short circuit in a main circuit to which a high voltage is applied. This solves the problem that the fuse must be replaced each time a short circuit occurs in the conventional circuit using the fuse as the protective device.
  • the circuit breaker transformer When the circuit breaker transformer is a cored transformer, a capacitor is provided in series or in parallel with the secondary coil so that the secondary coil is a resonant coil that resonates with the leakage flux of the primary coil. Also good. If a large current is input to the breaker circuit transformer, the core may be magnetically saturated and the breaker circuit transformer may not function. By making the secondary coil a resonant coil, even if the core can only store energy less than the breaking capacity of the circuit breaker, the leakage flux of the primary coil and the secondary coil resonate, eliminating the effects of magnetic saturation of the core can do.
  • Magnetic saturation occurs when the power energy flowing in the coil is stored in the core in the form of magnetic energy.
  • the portion where the primary coil is wound and the vicinity thereof are first magnetically saturated. If the magnetic flux generated in the primary coil flows smoothly to the secondary coil and electric power equivalent to the input is output from the secondary coil, magnetic saturation does not occur. Energy that is not extracted from the secondary coil is accumulated in the core and reaches saturation.
  • An air gap may be provided in a portion of the core portion constituting the first magnetic circuit where the primary coil and the secondary coil are not wound. If the air gap is not provided, the magnetic flux generated by the permanent magnet does not pass through the core portion around which the primary coil and the secondary coil are wound, and the primary coil of the core portion constituting the first magnetic circuit and the There is a possibility of passing through a portion where the secondary coil is not wound. In this case, the reverse bias action of the magnetic flux generated by the permanent magnet is reduced. However, by providing the air gap, the magnetic flux generated by the permanent magnet can easily pass through the core portion where the primary coil and the secondary coil are wound, and the magnetic flux generated by the permanent magnet acts efficiently as a reverse bias.
  • a circuit breaker includes the breaker transformer, and further includes a contact provided in the main circuit, an electromagnet that opens and closes the contact, and an electromagnet provided in the sub-circuit to excite the electromagnet.
  • a circuit breaker having an electromagnet coil is provided.
  • FIG. 1 is an electric circuit diagram of an electric device 100 provided with an arbitrary one of circuit breaker transformers according to first to third embodiments of the present invention.
  • the electric device 100 is, for example, a quick charger for an electric vehicle.
  • the electric device 100 includes a device 1 such as a charger main body, and a DC power source 2, a circuit breaker 3, and a breaker circuit transformer 4 are provided along with the device 1.
  • a circuit breaker 110 according to an embodiment of the present invention includes a circuit breaker 3 and a breaker circuit transformer 4.
  • some components of the device 1, the DC power supply 2, and the circuit breaker 3, and some components of the circuit breaker 4 are a main circuit 5 including a DC circuit.
  • the direct current power source 2 is composed of, for example, a rectifier that rectifies alternating current into direct current.
  • the DC power supply 2 may be a battery.
  • the voltage of the main circuit 5 is a high voltage of several hundred volts or more.
  • the circuit breaker 3 is a complete electromagnetic type in which the contact 3a is removed by an electromagnet (not shown).
  • the complete electromagnetic circuit breaker 3 includes an electromagnet that attracts the movable iron core, a braking spring that applies a force opposite to the attracting direction by the electromagnet to the movable iron core, braking oil, and the like (not shown). ).
  • an electromagnetic / thermal type may be used in combination with a thermal type in which the contact point 3a is removed by utilizing thermal deformation of the bimetal.
  • the circuit breaker 3 Since the circuit breaker 3 is a complete electromagnetic type in which the contact 3a is removed only by the action of an electromagnet, the circuit breaker 3 takes one of a non-operation state, a time-delay operation state, and an instantaneous operation state. In the non-operating state, the current of the circuit (sub circuit 6 in the first to third embodiments) is within the rated value, the electromagnet does not operate, and the circuit (main circuit 5 in the first to third embodiments) It is in a closed state. In the time delay operation state, when an overcurrent continues to flow in the circuit (sub circuit 6 in the first to third embodiments), the circuit (first to In the third embodiment, the main circuit 5) is shut off.
  • the electromagnet In the instantaneous operation state, when a large current of a certain value or more flows in the circuit (sub circuit 6 in the first to third embodiments), the electromagnet is instantaneously connected to the circuit (first to third embodiments) due to an increase in leakage flux. In this state, the main circuit 5) is shut off.
  • the primary coil 4a of the breaker circuit transformer 4 is inserted into the main circuit 5, and the secondary coil 4b is connected to the electromagnet coil 3b of the circuit breaker 3. Since the main circuit 5 and the sub circuit 6 are DC circuits, when the electrical equipment is operating normally, no current flows through the sub circuit 6 including the secondary coil 4b, and the circuit breaker 3 is in an inoperative state. is there.
  • the main circuit 5 When a short circuit occurs in the main circuit 5, a large amount of electric power corresponding to a current change due to the short circuit is supplied to the electromagnet coil 3 b of the circuit breaker 3 through the circuit breaker transformer 4. At that time, the current value caused by the short circuit generated in the primary coil 4a is further increased by supplying current to the electromagnet coil 3b by changing the current in the transformer 4 for the breaking circuit. Thereby, it will be in an instantaneous operation state, without passing through a time delay operation state. For this reason, the main circuit 5 can be interrupted by operating the circuit breaker 3 instantaneously when an overcurrent such as a short circuit occurs. As a result, the influence of the inrush current on various devices on the primary side main circuit can be suppressed low.
  • FIG. 2 is a diagram illustrating a schematic configuration of the first embodiment of the transformer for the cutoff circuit.
  • the cutoff circuit transformer 4A is a cored transformer and has a rectangular annular core 10.
  • the core 10 is made of a magnetic material such as an iron core.
  • a primary coil 4a and a secondary coil 4b are wound around portions 10a and 10b of the annular core 2 facing each other.
  • the ratio (N1 / N2) of the number of turns of the primary coil 4a to the number of turns of the secondary coil 4b is, for example, 3 or more.
  • the turn ratio (N1 / N2) is 3, in other words, the turn ratio of the secondary coil 4b to the primary coil 4a is 1/3.
  • an air core can be used. When making it cored, it is necessary to make it the core physique which can accumulate
  • FIG. 3 is a diagram showing a schematic configuration of the second embodiment of the transformer for the cutoff circuit.
  • This configuration of the cutoff circuit transformer 4B is effective when the size of the core 10 is small.
  • a capacitor 11 is provided in parallel with the secondary coil 4b.
  • the secondary coil 4b is a resonance coil that resonates with the leakage magnetic flux of the primary coil 4a.
  • the resonance frequency of the secondary coil 4b is preferably at least 250 Hz and 2.5 MHz or less. That is, preferably, the capacitor 11 is selected so as to satisfy this frequency condition. If the resonance frequency is within the above range, the cutoff time is 1 msec to 1 ⁇ sec.
  • the secondary coil 4b is a resonance coil, even if the core 10 can only store energy equal to or less than the breaking capacity of the circuit breaker 3, the leakage flux of the primary coil 4a and the secondary coil 4b resonate. Thus, the magnetic saturation of the core 10 can be eliminated.
  • FIG. 4 is a diagram showing a schematic configuration of the third embodiment of the transformer for the cutoff circuit.
  • This cutoff circuit transformer 4C is also a cored transformer.
  • the core 10 has a middle leg portion 10c in the center of a rectangular ring.
  • the core 10 also includes first and second outer leg portions 10d and 10e each having two sides of the rectangle located on both sides of the middle leg portion 10c.
  • the configuration of the cutoff circuit transformer 4C is also effective in suppressing the magnetic saturation of the core 10.
  • a first magnetic circuit 12 and a second magnetic circuit 13 are formed in parallel with each other in the core 10 of the cutoff circuit transformer 4C.
  • a part of the first magnetic circuit 12 is configured in the first outer leg part 10d, and a part of the second magnetic circuit 13 is configured in the second outer leg part 10e.
  • a primary coil 4 a and a secondary coil 4 b are wound around a middle leg portion 10 c that is a shared part of the first magnetic circuit 12 and the second magnetic circuit 13.
  • the first magnetic circuit 12 is a circuit serving as a path for magnetic flux generated when a current flows through the primary coil 4a. As in the illustrated example, it is preferable that an air gap 14 is provided in a portion of the first magnetic circuit 12 that is not shared with the second magnetic circuit 13 (first outer leg portion 10d).
  • the middle leg portion 10c and the outer leg portions 10d and 10e may have the same cross-sectional area.
  • a permanent magnet 15 is provided in the second outer leg portion 10e in which a part of the second magnetic circuit 13 is configured.
  • the permanent magnet 15 applies a magnetic flux 17 that is a reverse bias with respect to the magnetic flux 16 that passes through the first magnetic circuit 12.
  • a non-magnetic and conductive demagnetization preventing member 18 is installed on the outer periphery of the permanent magnet 15 to prevent demagnetization.
  • the middle leg part 10 c is disposed at a position close to the permanent magnet 15.
  • the reluctance of the second magnetic circuit 13 is reduced in the first magnetic circuit 12 with respect to the magnetic flux generated by the current flowing through the primary coil 4 a. It is set larger than the magnetic resistance. As a result, the magnetic flux generated by the current flowing through the primary coil 4a flows preferentially to the first magnetic circuit 12 side having a low magnetic resistance, so that the magnetic flux indicated by reference numeral 16 is generated.
  • the middle leg portion 10c has a smaller magnetic resistance than the first outer leg portion 10d provided with the air gap 14. For this reason, when the magnetic flux by the permanent magnet 15 flows preferentially to the part 10d of the core 10, the flow of the magnetic flux indicated by reference numeral 17 occurs, and a reverse bias can be effectively applied.
  • the magnetic flux 17 that is reverse-biased by the permanent magnet 15 provided in the second magnetic circuit 13 is applied to the magnetic flux 16 that passes through the first magnetic circuit 12.
  • the magnetic flux 16 flowing through the first magnetic circuit 12 and the magnetic flux 17 flowing through the second magnetic circuit 13 cancel each other, and the magnetic flux density of the core 10 is reduced.
  • the first quadrant portion on the BH curve magnetic hysteresis curve: see FIG. 5
  • the core 10 having a small physique is not easily magnetically saturated.
  • the magnetic flux 17 generated by the permanent magnet 15 is generated by the first magnetic circuit. 12 and the second magnetic circuit 13 are easily passed through a shared portion (middle leg portion 10c).
  • the magnetic flux 17 generated by the permanent magnet 15 is also generated when the shared portion (the middle leg portion 10 c) of the first magnetic circuit 12 and the second magnetic circuit 13 is disposed near the permanent magnet 15.
  • the magnetic circuit 12 and the second magnetic circuit 13 can easily pass through the shared portion (the middle leg portion 10c).
  • the magnetic flux 17 generated by the permanent magnet 15 acts efficiently as a reverse bias.
  • the magnetic flux 17 generated by the permanent magnet 15 causes the shared portion (the middle leg portion 10c) of the first magnetic circuit 12 and the second magnetic circuit 13 to be present. Without passing, there is a possibility that the first magnetic circuit 12 may pass through a portion not shared with the second magnetic circuit 13 (first outer leg portion 10d). In this case, the reverse bias action of the magnetic flux 17 generated by the permanent magnet 15 is reduced. Providing the air gap 14 prevents such a situation from occurring.
  • a configuration in which the secondary coil 4b is a resonance coil (FIG. 3) and a configuration in which a permanent magnet 15 for reverse excitation is provided (FIG. 4) can be used in combination.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

La présente invention porte sur un transformateur pour disjoncteur avec lequel il est possible d'actionner un disjoncteur instantanément pour disjoncter un circuit en cas de surintensité, par exemple lors d'un court-circuit. Le transformateur pour disjoncteur (4) comporte une bobine primaire (4a) et une bobine secondaire (4b). Un circuit principal (5) comprenant un circuit à courant continu comportant un point de contact (3a) d'un disjoncteur (3) dans lequel le point de contact est ouvert et fermé au moyen d'un électroaimant comporte la bobine primaire (4a) qui est connectée en série ou en parallèle avec le point de contact (3a). Un sous-circuit (6) sur lequel est placée une bobine électromagnétique (3b) pour exciter l'électroaimant du disjoncteur (3) comporte la bobine secondaire (4b), qui est connectée en série avec la bobine électromagnétique (3b). Le rapport de comptage d'enroulement de la bobine primaire (4a) et de la bobine secondaire (4b) est réglé de telle sorte que la valeur de courant circulant vers la bobine secondaire (4b) est supérieure à la valeur de courant circulant vers la bobine primaire (4a).
PCT/JP2017/001322 2016-01-20 2017-01-17 Transformateur pour disjoncteur WO2017126486A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-008709 2016-01-20
JP2016008709A JP2017131032A (ja) 2016-01-20 2016-01-20 遮断回路用トランス

Publications (1)

Publication Number Publication Date
WO2017126486A1 true WO2017126486A1 (fr) 2017-07-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115557581A (zh) * 2022-10-28 2023-01-03 湖南岳大环保科技有限公司 一种废液再利用设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448052A (en) * 1977-09-26 1979-04-16 Fuji Electric Co Ltd Leak breaker
JP2003007190A (ja) * 2001-06-20 2003-01-10 Nagano Fujitsu Component Kk 過電流検知装置および回路保護装置
JP2012039074A (ja) * 2010-07-15 2012-02-23 Osamu Ide トランス
WO2014188662A1 (fr) * 2013-05-21 2014-11-27 パナソニックＩｐマネジメント株式会社 Structure de bobine
JP2016181686A (ja) * 2015-03-23 2016-10-13 Ntn株式会社 インダクタおよび保護回路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448052A (en) * 1977-09-26 1979-04-16 Fuji Electric Co Ltd Leak breaker
JP2003007190A (ja) * 2001-06-20 2003-01-10 Nagano Fujitsu Component Kk 過電流検知装置および回路保護装置
JP2012039074A (ja) * 2010-07-15 2012-02-23 Osamu Ide トランス
WO2014188662A1 (fr) * 2013-05-21 2014-11-27 パナソニックＩｐマネジメント株式会社 Structure de bobine
JP2016181686A (ja) * 2015-03-23 2016-10-13 Ntn株式会社 インダクタおよび保護回路

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115557581A (zh) * 2022-10-28 2023-01-03 湖南岳大环保科技有限公司 一种废液再利用设备
CN115557581B (zh) * 2022-10-28 2023-05-23 湖南岳大环保科技有限公司 一种废液再利用设备

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