JP2009043556A - Electron type breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To trip a contact of a power supply line even in failure in an electron type breaker, and downsize it. <P>SOLUTION: The electron type breaker 1 includes a power supply line 2, a contact part 31, an electric current detecting part 4, a trip part 32, an abnormality judging part 33, a first energy supply mechanism 5, and a second energy supply mechanism 6. The first energy supply mechanism 5 has a CT 51 in a voltage electrode 21, and outputs the power supply from the electric current detected by the CT 51. The second energy supply mechanism 6 outputs the power supply from an interphase voltage. The failure determination part 33 trips the contact part 31 by energy of the two energy supply mechanisms. In this way, since this includes the two energy supply mechanisms, energy supply is carried out from the second energy supply mechanism 6 at the normal time, and from the first energy supply mechanism when in failure, the contact part 31 can be tripped with superior precision. Moreover, since only one CT 51 is necessary to output energy, the electron type breaker 1 can be downsized. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic breaker provided with an energy supply mechanism.

  2. Description of the Related Art Conventionally, a leakage breaker that supplies power by a phase-to-phase voltage to a trip portion that trips a contact of a power supply line at the time of leakage is known. However, in the configuration in which power is supplied to the trip portion only by the interphase voltage, the interphase voltage decreases when an abnormality such as a short circuit occurs, and thus the trip portion cannot be driven.

  In addition, an electronic breaker is provided in which current transformers are provided for all power supply lines, current is detected by the current transformer, energy is output from the current of the power supply line by the current transformer, and energy is supplied to drive the trip unit. It has been known. One configuration of an electronic breaker that outputs energy by such a current transformer is shown in FIG. The electronic breaker 101 is a single-phase three-wire breaker, and includes a power supply line 102 including a voltage electrode and a neutral electrode, a contact 131 provided on the power supply line 102, and a current for detecting a current of each power supply line 102. The detection part 104 and the trip part 132 which pulls out the contact 131 are provided. The electronic breaker 101 further outputs an abnormality signal when an abnormality such as an overcurrent or a short circuit occurs, and an abnormality determination unit 133 that trips the contact 131 by the trip unit 132 and a power source that drives the trip unit 132 and the abnormality determination unit 133. And a power supply circuit 152 to be supplied.

  The current detection unit 104 includes a current transformer 151 having a current detection function and an energy supply function, and the power supply circuit 152 is supplied with energy from the current transformer 151. Abnormality determination unit 133 determines an abnormality based on the current value detected by current detection unit 104, and when it is determined that an abnormality has occurred, outputs an abnormal signal to trip unit 132 and receives the abnormal signal. 132 contacts the contact 131 by the power supply from the power supply circuit 152.

  However, in the electronic breaker 101 that outputs energy by such a current transformer, all the current transformers 151 arranged in the three power supply lines 102 have both the current detection function and the energy supply function. The flow device 151 becomes large, and it becomes difficult to reduce the size of the electronic breaker 101. In addition, when trying to supply energy only with the current transformer 151, in the case of the low-rated electronic breaker 101, the energy for operating the trip unit 132 must be supplied with a small current, so the rated current of the electronic breaker 101 is The lower the value, the larger the current transformer 151 is required, and the electronic breaker 101 is difficult to downsize.

  There is also known an electronic breaker that includes a power supply unit provided with current transformers in all power supply lines and a power supply unit connected to an external power supply (see Patent Document 1).

However, the electronic breaker disclosed in Patent Document 1 requires an external power source, and wiring is complicated to connect to the external power source.
JP 2001-161023 A

  The present invention has been made to solve the above-described conventional problems, and is a small electronic breaker that can supply energy to the abnormality determination unit and trip unit even in the event of an abnormality and can disconnect the contact of the power line. The purpose is to provide.

  In order to achieve the above object, the invention of claim 1 is based on a current detection unit provided in each line of a three-wire power supply line and detecting a current of each line, and a current value detected by the current detection unit. In the electronic breaker comprising: an abnormality determination unit that determines overcurrent and a trip unit that trips a contact portion provided in the breaker in response to an abnormality signal from the abnormality determination unit. A first energy supply mechanism that outputs energy by a current transformer having an energy supply function provided in the second current output mechanism, and a second energy that outputs energy by an interphase voltage between a line provided with the current transformer and the other lines. An energy supply mechanism, and energy is supplied to the abnormality determination section and the trip section by at least one of the energy supply mechanisms.

  The invention according to claim 2 is a current detection unit that is provided in each line of a three-wire power supply line and detects a current of each line, and an abnormality that determines an overcurrent based on a current value detected by the current detection unit An electronic breaker comprising: a determination unit; and a trip unit that trips a contact unit provided in the breaker in response to an abnormality signal from the abnormality determination unit. The current detection unit is a current transformer having a current detection function. And at least one of the current transformers has both a current detection function and an energy supply function, and a first energy supply mechanism that outputs energy by the dual-purpose current transformer; A second energy supply mechanism that outputs energy by an interphase voltage between the line provided with the dual-purpose current transformer and the other lines, and at least one of the energy supply mechanisms And it supplies energy to the abnormality judging section and the trip unit.

  According to a third aspect of the present invention, in the electronic breaker according to the first or second aspect, the current detection unit includes a Rogowski coil.

  According to a fourth aspect of the present invention, in the electronic breaker according to any one of the first to third aspects, the first energy supply mechanism is connected from the current transformer having the energy supply function via a rectifier circuit. And the second energy supply mechanism has a voltage power supply circuit for supplying power by performing AC / DC conversion from the interphase voltage via a step-down circuit, and the current power supply circuit and the voltage supply circuit. By connecting the outputs of the power supply circuit, the two outputs complement each other to supply power.

  According to a fifth aspect of the present invention, in the electronic breaker according to the fourth aspect, the first energy supply mechanism has a constant voltage power supply circuit in a subsequent stage of the rectifier circuit, and the constant voltage power supply circuit and the voltage power supply By making the output voltages of the circuits substantially the same, the outputs of the two power supplies are added to supply the power.

  According to a sixth aspect of the present invention, in the electronic breaker according to the fourth or fifth aspect, a backflow of current interposed between the power source connecting the current power source circuit and the voltage power source circuit and the trip unit is provided. A backflow prevention element for preventing the charging circuit and a charging circuit connected in parallel to the trip unit are provided, and the trip unit is driven by the energy accumulated in the charging circuit when an abnormality occurs.

  According to a seventh aspect of the present invention, in the electronic breaker according to any one of the fourth to sixth aspects, the power source connecting the current power source circuit and the voltage power source circuit is interposed between the abnormality determining unit. And an open / close circuit that cuts off the power supply to the abnormality determination unit, and a charging circuit that charges energy for driving the abnormality determination unit, and the abnormality determination unit generates an abnormal signal in the event of an abnormality. The circuit is cut off and driven by the charging energy of the charging circuit, and power is supplied to the trip unit from the two power supply circuits.

  According to the first aspect of the present invention, the first energy supply mechanism that outputs energy by the current transformer provided in the power supply line and the second energy supply mechanism that outputs energy from the interphase voltage of the power supply line are used. Therefore, the abnormality determination unit and the trip unit can be supplied with energy from the second energy supply mechanism at the normal time or when a ground fault occurs, and can be supplied from the first energy supply mechanism when a short circuit occurs. It can be carried out. Therefore, when an abnormality occurs, the contact of the power line can be accurately removed. In addition, since the number of current transformers for supplying energy can be reduced, the electronic breaker can be reduced in size and cost.

  According to the second aspect of the present invention, one of the current transformers having a current detection function of the current detection unit provided in each power supply line also serves as an energy supply mechanism that outputs energy. The number of current transformers can be reduced as compared with the case where the current transformer is provided separately from the detector. In addition, since the current transformer having only the current detection function is small, the electronic breaker can be reduced in size and cost.

  According to the invention of claim 3, since the Rogowski coil is thin and small in size, the electronic breaker can be further reduced in size. Further, since the Rogowski coil is not magnetically saturated, an accurate current value can be measured.

  According to the invention of claim 4, by connecting the current power supply circuit and the voltage power supply circuit, the two power supply circuits complement each other to supply the power, so that the energy can be stably supplied even in the event of an abnormality.

  According to the invention of claim 5, since the outputs of the two power supplies are supplied together by aligning the output voltages of the current power supply circuit and the voltage power supply circuit, the output of each power supply circuit can be reduced, Each power supply circuit can be miniaturized.

  According to the sixth aspect of the present invention, the contact of the power supply line can be disconnected by the energy accumulated in the charging circuit, so that the power supply from the voltage power supply circuit is cut off, and the energy is insufficient only from the current power supply circuit. In addition, the contact can be accurately removed. Even if the current value of the power supply line exceeds the rated current value, there is a time margin until the contact is removed according to the current value, so that energy necessary for driving the trip portion can be charged. Therefore, since the energy output from the current transformer may be small, the current transformer can be miniaturized.

  According to the seventh aspect of the present invention, the energy supply to the abnormality determination unit is stopped at the time of abnormality, and the energy from the two power supply circuits is supplied only to the trip unit. As a result, the energy supplied by the two power supply circuits may be only the energy required for driving the trip section, so that the outputs of the two power supply circuits can be reduced and the respective power supply circuits can be miniaturized.

(First embodiment)
An electronic breaker according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows the configuration of an electronic breaker. The electronic breaker 1 is a single-phase three-wire breaker, and includes a power line 2 composed of voltage electrodes 21 and 22 and a neutral electrode 23, a contact portion 31 provided on each of the power lines 2, and each power line. 2, a current detection unit 4 that detects each current, a trip unit 32 that trips the contact unit 31, and an abnormality that determines abnormality based on current detection by the current detection unit 4 and trips the contact unit 31 by the trip unit 32. And a determination unit 33. The electronic breaker 1 further includes a first energy supply mechanism 5 and a second energy supply mechanism 6 as drive power sources for the trip unit 32 and the abnormality determination unit 33.

  The first energy supply mechanism 5 includes a current transformer (CURRENT TRANSFORMER, hereinafter abbreviated as CT) 51 that is provided in the voltage electrode 21 and detects a current, and a current power supply circuit 52 that outputs power from the current detected by the CT 51. . The second energy supply mechanism 6 includes a voltage power supply circuit 61 that outputs power from an interphase voltage between the voltage electrode 21 and the voltage electrode 22. At least one of the first energy supply mechanism 5 and the second energy supply mechanism 6 supplies energy to the trip unit 32 and the abnormality determination unit 33 via the synthesis circuit 7.

  The current detection unit 4 includes a current detection element 41 that detects a current value in each line of the power supply line 2. The current detection element 41 is, for example, a Rogowski coil. The trip unit 32 includes, for example, a transistor 32a and an electromagnet 32b. The transistor 32a causes a current from the synthesis circuit 7 to flow to the electromagnet 32b by an abnormal signal from the abnormality determination unit 33, and a contact portion by the magnetic force of the electromagnet 32b. Pull 31 off.

  CT will be described with reference to FIG. There are three types of CT: current detection type, energy type, and current detection / energy type. FIG. 2 shows a relationship between various CT outputs and current values flowing through the power supply line. In the figure, the horizontal axis indicates the current value flowing through the power supply line, and the vertical axis indicates the CT output. The current value on the horizontal axis is divided into the normal range that is the normal current range, the overcurrent tripping area that trips when the overcurrent flows beyond the specified time, and the instantaneous tripping range that trips immediately due to a short circuit or electrical leakage. It has become. 100% or more of the rated current value is set as an overcurrent tripping region, and further, for example, 2000% or more of the rated current value is set as an instantaneous tripping region. On the vertical axis, the energy required for the trip part 32 to pull off the contact part 31 is indicated by a one-dot chain line L. The solid line A indicates the output of the current detection type CT, the solid line B indicates the output of the energy type CT, and the solid line C indicates the output of the current detection type / energy type CT.

  The current detection type CT can measure the current value, but cannot output the energy required to remove the contact. The energy type CT can output the energy necessary for pulling off the contact point, but cannot measure the current value. The current detection / energy type CT can measure the current value or output the energy necessary to remove the contact.

  The current detection type CT outputs in proportion to the power supply line current value over the entire region of the power supply line current. However, since it is not necessary to output the energy necessary for pulling off the contact portion 31, the size can be reduced and the cost can be reduced.

  The energy type CT is large in size because it needs to output the energy necessary to detach the contact portion 31 in the region of 100% or more of the rated current value.

  The current detection / energy type CT outputs the energy necessary to detach the contact portion 31 in the region of 100% or more of the rated current value, and the circuit current value is up to 2000% of the rated current value. Since it outputs in proportion, it becomes larger than energy type CT. The CT 51 of this embodiment is an energy-type CT or a current detection / energy-type CT because it must output energy necessary to detach the contact portion 31.

  Next, the operation of the electronic breaker 1 according to the present embodiment will be described again with reference to FIG. The current detection unit 4 detects the current value of each line by the current detection element 41 and transmits the detected current value data to the abnormality determination unit 33. The abnormality determination unit 33 determines an overcurrent, a short circuit, or the like based on the current value data transmitted from the current detection unit 4. If the abnormality determination unit 33 determines that an abnormality such as an overcurrent or a short circuit has occurred, an abnormality signal is sent to the trip unit 32. Send. The trip unit 32 that has received the abnormal signal drives the electromagnet 32b to detach the contact unit 31.

  In such an operation of the electronic breaker 1, the drive power for the trip unit 32 and the abnormality determination unit 33 is normally supplied from the second energy supply mechanism 6 by the interphase voltage of the power supply line 2, but the overcurrent When there is an abnormality such as a short circuit or the like, it is supplied as follows.

  When an overcurrent occurs in any one of the power supply lines 2, the voltage between the voltage electrode 21 and the voltage electrode 22 is maintained, so that energy can be supplied by the second energy supply mechanism 6. In addition, when an overcurrent flows through the power supply line 2 of the voltage electrode 21, energy can be supplied also by the CT 51.

  When a short circuit occurs between the voltage electrode 21 provided with the CT 51 and the other electrode, a large current flows through the voltage electrode 21, so that energy can be supplied by the CT 51. In addition, when a ground fault occurs at the voltage electrode 21 provided with the CT 51, a large current flows through the voltage electrode 21, so that energy can be supplied by the CT 51.

  When a short circuit occurs between the voltage electrode 22 where the CT 51 is not provided and the neutral electrode 23, the potential difference between the voltage electrode 21 and the voltage electrode 22 is only slightly reduced from the normal time. Energy can be supplied by the mechanism 6. In addition, when a ground fault occurs in the voltage electrode 22 or the neutral electrode 23, the voltage between the voltage electrode 21 and the voltage electrode 22 is maintained, so that energy can be supplied by the second energy supply mechanism 6. Become.

  Thus, in the electronic breaker 1 of the present embodiment, the energy supply to the abnormality determination unit 33 and the trip unit 32 is performed from any one of the energy supply mechanisms even when an abnormality such as an overcurrent or a short circuit occurs. The two contacts 31 can be accurately removed. Moreover, since one large CT51 that outputs energy is sufficient, the electronic breaker 1 can be made small and inexpensive. Moreover, since CT51 supplies energy required to detach the contact part 31 with a current value of 100% or more of the rated current, the CT51 can also be used for a low-rated electronic breaker 1.

  Further, by using a Rogowski coil for the current detection element 41, the Rogowski coil is thin and small in size, so that the electronic breaker 1 can be made small. Further, since the Rogowski coil is not magnetically saturated, an accurate current value can be measured.

  Next, a modification of the electronic breaker according to the present embodiment will be described with reference to the drawings. FIG. 3 shows the configuration of the electronic breaker of this modification. Unlike the electronic breaker of the first embodiment, the electronic breaker 1 includes a CT 51 in the voltage electrode 21 and the voltage electrode 22, and the voltage power supply circuit 61 has an interphase voltage from all the poles of the three power supply lines. Have taken. CT51 is energy type CT or electric current detection and energy type CT. Since the electronic breaker 1 of the present modification has the configuration of the electronic breaker of the first embodiment, current detection and energy supply can be performed in the same manner as the electronic breaker of the first embodiment. .

  Furthermore, the electronic breaker 1 of this modification can calculate electric power based on the potential difference of all the interphase voltages. Further, by arranging the CT 51 at the voltage electrode 21 and the voltage electrode 22 located at both ends of the power supply line, a plurality of electronic breakers 1 are arranged in parallel, and a short circuit is caused between the electrodes of the adjacent electronic breakers 1. Even when it occurs, the trip part 32 can be driven. FIG. 4 shows a state in which the electronic breakers 1 are arranged in parallel. A plurality of electronic breakers 1 are arranged as branch breakers in a branch circuit branched from the trunk circuit in which the main breaker 11 is arranged. The voltage electrode 12 b of the branch breaker 12 is connected to the voltage electrode 11 b of the main breaker 11, and the voltage electrode 13 a of the branch breaker 13 is connected to the voltage electrode 11 a of the main circuit breaker 11. Even if a short circuit occurs between the adjacent voltage electrode 12b and the voltage electrode 13a, energy is supplied from the current of the power supply line by the CT 51 disposed in each of the voltage electrode 12b and the voltage electrode 13a, and the trip portion is Can be driven.

(Second Embodiment)
An electronic breaker according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 5, the electronic breaker 1 is different from the electronic breaker of the first embodiment in the configuration of the current detection unit 4. The current detection unit 4 has a CT as the current detection element 41 in the three power supply lines 2. A current detection type CT 51 a that is, for example, a Rogowski coil is arranged on the power supply line of the voltage electrode 22 and the neutral electrode 23, and a current detection / energy type CT 51 b is arranged on the power supply line of the voltage electrode 21. . The current detection / energy type CT 51 b is also connected to the current power supply circuit 52 and constitutes the first energy supply mechanism 5. With this configuration of the electronic breaker 1, the three CTs arranged on the power supply line 2 perform current detection, and the current detection / energy type CT 51b supplies energy, so that the electronic type of the first embodiment is used. As with the breaker 1, current detection and energy supply can be performed.

  According to the present embodiment, the current detection / energy type CT 51b is used as one of the current detection elements 41 and is shared by the current detection unit 4 and the first energy supply mechanism 5, so that the number of CTs is reduced. Can do. In addition, the two current detection type CTs 51a perform only current detection without supplying energy, and thus may be small CTs. As a result, the electronic breaker 1 can be made small and inexpensive.

(Third embodiment)
An electronic breaker according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 6, the electronic breaker 1 is different from the electronic breaker 1 according to the first embodiment. The current power supply circuit 52 of the first energy supply mechanism 5 includes a rectifier circuit 53, and the second The voltage power supply circuit 61 of the energy supply mechanism 6 has a step-down circuit 62. A constant voltage power circuit 8 is disposed between the two power circuits and the abnormality determination unit 33. In the present embodiment, the configuration for measuring the CT 51 and the interphase voltage 63 may be the same as that of the modification of the first embodiment or the electronic breaker of the second embodiment.

  In the first energy supply mechanism 5, the current detected by the CT 51 is converted into a direct current by the rectifier circuit 53 and then converted into a voltage. In the second energy supply mechanism 6, the interphase voltage 63 is converted into direct current by a rectifier circuit (not shown), and is stepped down to the drive voltage of the trip unit 32 by the step-down circuit 62. The outputs of the current power supply circuit 52 and the voltage power supply circuit 61 are connected, and power is supplied from the power supply circuit with the higher voltage. Power is supplied to the trip unit 32 at a voltage depending on the state in which both power supply circuits are connected. The abnormality determination unit 33 is supplied with power by being stepped down to the drive voltage of the abnormality determination unit 33 by the constant voltage power supply circuit 8.

  In this way, by connecting the outputs of the current power supply circuit 52 and the voltage power supply circuit 61, power can be supplied from the power supply circuit having the higher voltage to the trip unit 32 and the abnormality determination unit 33. Sometimes stable energy supply is possible. Further, in this configuration, by making the voltage of the abnormal signal from the abnormality determining unit 33 to the trip unit 32 coincide with the voltage of the constant voltage power supply circuit 8, the power of the abnormal signal can be secured at the same time.

(Fourth embodiment)
An electronic breaker according to a fourth embodiment of the present invention will be described with reference to the drawings. In FIG. 7, the electronic breaker 1 differs from the electronic breaker 1 according to the third embodiment in that a constant voltage power circuit 54 is arranged after the rectifier circuit 53 in the current power circuit 52.

  FIG. 8 shows one circuit configuration of the electronic breaker 1. The current power supply circuit 52 includes a rectifier circuit 53 connected to a CT 51 attached to the power supply line 2 and a constant voltage power supply circuit 54. The current flowing through the power supply line 2 is detected by the CT 51 and converted into a direct current by the rectifier circuit 53 using the diode D1. The direct current is converted into a voltage by a constant voltage power supply circuit 54 including a resistor R1 and a constant voltage diode D2. The voltage of the constant voltage diode D2 at this time is matched with the driving voltage of the trip unit 32. The output of the constant voltage power circuit 54 is combined with the output from the voltage power circuit 61 via the diode D3.

  On the other hand, the voltage power supply circuit 61 full-wave rectifies the voltage of the power supply line 2 by the rectifier circuit 64 and stabilizes it by the MOSFET 65 via the current limiting element L1. The MOSFET 65 fixes the gate potential by a constant voltage diode D4 connected between the gate ground and stabilizes the output voltage. The stabilized voltage is stepped down by the step-down circuit 62 of the DC / DC converter and lowered to the same potential as the output voltage of the current power supply circuit 52. The synthesized output of the power supply circuit is lowered to the drive voltage of the abnormality determination unit 33 by the constant voltage power supply circuit 8 and supplied to the abnormality determination unit 33. Further, an element 66, for example, ZNR, for reducing the surge voltage and surge current from the power supply line 2 is provided in the previous stage of the rectifier circuit 64, and a surge due to the switching operation of the step-down circuit 62 and the MOSFET 65 is provided in the subsequent stage of the rectifier circuit 64. A noise filter 67 is provided to prevent noise. In this way, by aligning the output voltages of the current power supply circuit 52 and the voltage power supply circuit 61, the outputs of the two power supplies can be supplied together, so the outputs of the respective power supply circuits can be reduced, Each power supply circuit can be reduced in size.

(Fifth embodiment)
An electronic breaker according to a fifth embodiment of the present invention will be described with reference to FIG. In FIG. 9, unlike the electronic breaker according to the third embodiment, the electronic breaker 1 includes a backflow prevention element 91 for preventing a backflow of current between the two power supply circuits and the trip unit 32, and a trip unit. 32, a trip part charging circuit 92 (charging circuit) connected in parallel. The trip part charging circuit 92 stores the surplus energy of the current power supply circuit 52 and the voltage power supply circuit 61.

  With such a configuration, the contact portion 31 of the power supply line 2 can be disconnected by the energy accumulated in the trip portion charging circuit 92, so that the power supply from the voltage power supply circuit 61 is cut off and the current power supply circuit 52 is disconnected. Even when the energy supply is insufficient only by supplying power from the contact point 31, the contact portion 31 can be accurately removed. Even if the current value of the power supply line 2 exceeds the rated current value, there is a margin time until the contact portion 31 is pulled off, so that the energy required for driving the trip portion 32 can be charged. Therefore, the CT51 can be reduced in size because it requires less energy.

(Sixth embodiment)
An electronic breaker according to a sixth embodiment of the present invention will be described with reference to FIG. In FIG. 10, the electronic breaker 1 is different from the electronic breaker according to the third embodiment in that an open / close circuit 93 and a determination unit charging circuit 94 (charging circuit) are provided between the constant voltage power supply circuit 8 and the abnormality determination unit 33. ). Abnormality determination unit 33 normally closes open / close circuit 93 and stores energy in determination unit charging circuit 94. When an abnormality occurs, the abnormality determination unit 33 opens the open / close circuit 93 and is driven by the energy stored in the determination unit charging circuit 94 to supply energy from the two power supply circuits only to the trip unit 32. As a result, the energy supplied by the two power supply circuits may be only the energy required for driving the trip unit 32, so the outputs of the two power supply circuits can be reduced and the respective power supply circuits can be made smaller.

  In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, an electronic breaker may be used for three-phase current.

The block diagram of the electronic breaker which concerns on the 1st Embodiment of this invention. The figure which shows the relationship between the power supply line electric current value and current transformer output in the current transformer of the same electronic breaker. The block diagram of the modification of the same electronic breaker. The figure which shows the state in which the electronic breaker of the modification was arranged in parallel. The block diagram of the electronic breaker which concerns on the 2nd Embodiment of this invention. The block diagram of the electronic breaker which concerns on the 3rd Embodiment of this invention. The block diagram of the electronic breaker which concerns on the 4th Embodiment of this invention. The circuit diagram of the same electronic breaker. The block diagram of the electronic breaker which concerns on the 5th Embodiment of this invention. The block diagram of the electronic breaker which concerns on the 6th Embodiment of this invention. The block diagram of the conventional electronic breaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic breaker 2 Power supply line 31 Contact part 32 Trip part 33 Abnormality judgment part 4 Current detection part 5 1st energy supply mechanism 51, 51a, 51b CT (current transformer)
52 Current power supply circuit 53 Rectifier circuit 54 Constant voltage power supply circuit 6 Second energy supply mechanism 61 Voltage power supply circuit 62 Step-down circuit 91 Backflow prevention element 92 Trip part charging circuit (charging circuit)
93 Open / close circuit 94 Judgment unit charging circuit (charging circuit)

Claims (7)

A current detector provided in each line of the three-wire power supply line for detecting a current of each line; an abnormality determination unit for determining an overcurrent based on a current value detected by the current detector; and the abnormality determination In an electronic breaker provided with a trip part that trips a contact part provided in the breaker in response to an abnormal signal from the part,
A first energy supply mechanism for outputting energy by a current transformer having an energy supply function provided in any one line;
A second energy supply mechanism that outputs energy by an interphase voltage between the line provided with the current transformer and the other lines;
An electronic breaker, wherein energy is supplied to the abnormality determination unit and the trip unit by at least one of the energy supply mechanisms. A current detector provided in each line of the three-wire power supply line for detecting a current of each line; an abnormality determination unit for determining an overcurrent based on a current value detected by the current detector; and the abnormality determination In an electronic breaker provided with a trip part that trips a contact part provided in the breaker in response to an abnormal signal from the part,
The current detection unit includes a current transformer having a current detection function,
At least one of the current transformers has a first energy supply mechanism that combines a current detection function and an energy supply function, and outputs energy by the combined current transformer;
A second energy supply mechanism that outputs energy by an interphase voltage between the line provided with the combined current transformer and the other lines;
An electronic breaker, wherein energy is supplied to the abnormality determination unit and the trip unit by at least one of the energy supply mechanisms.   The electronic breaker according to claim 1, wherein the current detection unit includes a Rogowski coil. The first energy supply mechanism has a current power supply circuit that supplies power through a rectifier circuit from a current transformer having the energy supply function,
The second energy supply mechanism has a voltage power supply circuit for supplying power by performing AC / DC conversion from the interphase voltage via a step-down circuit,
The power supply is supplied by complementing each other with two outputs by connecting the respective outputs of the current power supply circuit and the voltage power supply circuit. Electronic breaker. The first energy supply mechanism has a constant voltage power supply circuit at a subsequent stage of the rectifier circuit,
5. The electronic breaker according to claim 4, wherein the constant voltage power supply circuit and the voltage power supply circuit have substantially the same output voltage, thereby adding the outputs of the two power supplies to supply power. . A backflow prevention element for preventing a backflow of current interposed between the power supply connected to the current power supply circuit and the voltage power supply circuit and the trip unit;
A charging circuit connected in parallel to the trip unit,
The electronic breaker according to claim 4 or 5, wherein the trip unit is driven by energy stored in the charging circuit when an abnormality occurs. An open / close circuit that is interposed between the abnormality determination unit and a power source that connects the current power supply circuit and the voltage power supply circuit, and that blocks power supply to the abnormality determination unit;
A charging circuit for charging energy for driving the abnormality determination unit,
The abnormality determination unit emits an abnormality signal at the time of abnormality and shuts off the open / close circuit and is driven by the charging energy of the charging circuit,
The electronic breaker according to any one of claims 4 to 6, wherein power is supplied to the trip unit from the two power supply circuits.

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