JP5285358B2 - Current transformer - Google Patents

Description

  The present invention includes two cases each having a core built therein and one end side of which is rotatably connected to each other. An electric wire can be easily passed through an electric wire penetration space surrounded by the two cases, or an electric wire can be passed from the electric wire penetration space. It relates to a current transformer that can be removed.

  Conventionally, various separation type current transformers have been proposed (see, for example, Patent Document 1). One conventional example of such a separation type current transformer is shown in FIGS.

  9 and 10, the current transformer 100 includes a first case 101 and a second case 102, and the first case 101 and the second case 102 are rotatable by a rotation support portion 103 at one end side of each other. It is connected. A first core 104 is accommodated in the first case 101, and a second core 105 is accommodated in the second case 102. Both the first core 104 and the second core 105 are composed of a plurality of laminated L-shaped ferromagnetic plates. Both ends of the first core 104 and the second core 105 are exposed to the outside from the open ends 101a, 101b, 102a, 102b on both sides of the first case 101 and the second case 102, respectively. Coils (not shown) are wound around the outer circumferences of the first core 104 and the second core 105, respectively. In the first case 101, an electric wire 120 for taking out a current flowing in the coil is drawn out.

  The first case 101 and the second case 102 have both open ends 101a, 101b, 102a, which are opposed to each other and an open position where the two open ends 101a, 101b, 102a, 102b are separated from each other (state in FIG. 9). It changes by rotation between the closed position (state of FIG. 10) with which 102b abuts.

In the open position, as shown in FIG. 9, an inner opening gap 110 is formed between the opening ends 101a and 102a of the first case 101 and the second case 102 on the side close to the rotation support portion 103, and A wire entrance / exit gap 111 is formed between the open ends 101b and 102b of the first case 101 and the second case 102 on the side farther from the rotation support portion 103. The electric wire W can be inserted into the electric wire penetration space 113 surrounded by the first case 101 and the second case 102 through the electric wire entrance / exit gap 111, or the electric wire W in the electric wire penetration space 113 can be removed to the outside.

  In the closed position, as shown in FIG. 10, the wire penetration space 113 surrounded by the first case 101 and the second case 102 is closed, and both ends of the first core 104 and the second core 105 are connected by fitting. Thus, a rectangular closed magnetic path is formed.

  Further, the opening ends 101b and 102b on both sides of the first case 101 and the second case 102 farther from the rotation support portion 103 and both side surfaces of the first case 101 and the second case 102 are shown in FIG. As shown in detail, a pair of locking means 106 are provided that are locked in the closed position. Each lock means 106 includes an elastic lock arm 107 and a locked portion 108 that is locked by the elastic lock arm 107.

  Next, a procedure for measuring the leakage current of the electric wire 120 arranged in the distribution board or the like using the current transformer 100 will be described. The current transformer 100 is set to the open position of FIG. 9, and a measurement target wire (not shown) is inserted into the wire penetration space 113 through the wire entrance / exit gap 111. When the electric wire is inserted into the electric wire penetration space 113, the first case 101 and the second case 102 are relatively rotated with the rotation support portion 103 as a fulcrum, and the current transformer 100 is set to the closed position in FIG. In the closed position, the pair of locking means 106 are locked together and held in the closed position.

When a leakage current flows through the electric wire, a magnetic flux proportional to the current is generated in the closed magnetic path composed of the first core 104 and the second core 105, and a current proportional to the magnetic flux flows through the coil, so that the leakage current can be measured. When the measurement is completed, the pair of locking means 106 are unlocked, the first case 101 and the second case 102 are relatively rotated to the open position, and the electric wire in the electric wire penetration space 113 is removed from the electric wire entrance / exit gap 111 to the outside.
JP 2001-307934 A JP-A-11-251167

However, in the conventional current transformer 100, when the electric wire is inserted into the electric wire penetration space 113 with the first case 101 and the second case 102 as the open positions, the rotation support portions 103 of the first case 101 and the second case 102 are used. A wire entrance / exit gap 111 is formed between the opening ends 101b and 102b on the farther side, and the opening ends 101a and 102a on the side close to the rotation support portion 103 of the first case 101 and the second case 102 are formed. An inner opening gap 110 is formed therebetween. Therefore, when the electric wire to be inserted into the electric wire penetration space 113 is inserted up to the position of the inner opening gap 110 and the first case 101 and the second case 102 are rotated relative to each other in this state, both open end 101a of the second case 102, there is a risk to clamp the wire in 102a. As described above, the electric wire is sandwiched between the two open ends 101a and 102a, and there is a risk that the electric wire may be damaged (damaged), and there is a possibility that the ends of the first core and the second core may be damaged (damaged). Troubles such as inability to perform proper measurement work.

  Therefore, the present invention provides various types resulting from the fact that the electric wire is sandwiched between the open ends of the first case and the second case when the electric wire is inserted into the electric wire penetration space surrounded by the first case and the second case. It aims at providing the current transformer which prevented the malfunction of this.

The first feature of the present invention is that the first core is accommodated in the interior, the first case where the ends of the first core are exposed from the opening ends on both sides, the second core is accommodated in the interior, A second case in which the end of the second core is exposed from the opening end, and the first case and the second case are both open ends facing each other and an open position where both opening ends facing each other are separated from each other. together but is rotatably coupled between the closed position abutting, in the open position, inside opening gap between the opening end of the both side close to the rotation support portion of the first case and the second case is formed, A wire entrance / exit gap is formed between the open ends of the first case and the second case farther from the rotation support portion, and the wire is inserted into the wire penetration space surrounded by the first case and the second case from the wire entrance / exit gap. Can be inserted and withdrawn In the current transformer, the inner opening gap and the wire entrance / exit gap are both closed, and both ends of the first core and the second core are connected to form a predetermined magnetic path by the first core and the second core. A pair of the first case and the second case, in which a lead-out wire for guiding the current flowing in the coil is drawn out, is controlled by a pair of wires that restrict the entry of the wire from the wire penetration space into the inner opening gap . A restricting portion is provided, and the pair of restricting portions are arranged so as to move along the outer surface of the case from which the lead-out wire is not drawn .

Invention of Claim 2 is the current transformer of Claim 1, Comprising: The shape of the outer peripheral end of a pair of control part is the movement locus | trajectory of the outermost peripheral position of the opening end of the case where the lead- out electric wire is not pulled out. wherein the arcuate der Rukoto along.

A third aspect of the present invention is the current transformer according to the first or second aspect , wherein the first core and the first core are disposed at the opening ends of the first case and the second case farther from the rotation support portion. a pair of guard portions which projects from the protruding end of the second core, characterized that you have provided.

A fourth aspect of the present invention, a current transformer according to claim 3, a pair of guard portions of the pair of guard portion and the second case of the first case, the open position of the first case and the second case in moving process between the closed position, the inner surface of the pair of guide portions of the lead wire is not pulled out derives wire along the outer surface of the pair of guide portions of the case being drawn cases that you slide Features.

The invention of claim 5 is a current transformer according to claim 3, a pair of guard portions of the pair of guard portion and the second case of the first case, the open position of the first case and the second case In the process of moving between the closed positions, both are guided to move along a relatively appropriate movement locus.

  Invention of Claim 6 is a current transformer in any one of Claims 1-5, Comprising: On the opening end side of the side far from the rotation support part of a 1st case and a 2nd case, and The first case and the back surface of the second case are each provided with a single locking means to be locked at the closed position, and the locking means is composed of an elastic lock arm and a locked part, The rotation direction from the closed position to the open position of the first case and the second case is the unlocking direction.

A seventh aspect of the present invention is the current transformer according to the sixth aspect, wherein the elastic lock arm is provided on the case side from which the lead- out electric wire is not drawn.

  According to the first aspect of the present invention, when the electric wire is inserted into the electric wire penetration space with the first case and the second case being in the open position, even if the electric wire attempts to enter the internal gap, the entry is blocked by the restricting portion. The Therefore, it is possible to prevent various inconveniences caused by the electric wire being sandwiched between the opening ends of both the first case and the second case. Specifically, there is no fear of damaging (damaging) the electric wires, and there is no fear of damaging (damaging) the end portions of the first core and the second core, and a smooth measurement operation is possible.

Also, the operator fixes the case side which is derived wire is pulled out, the case side to derive the wire is not pulled out easily toward the rotating operation rotating operation, also the pair of restricting portions in such a control mode fixed Since the relative rotation between the cases can be performed even when the worker holds the pair of restricting portions, the operability is good.

According to the second aspect of the present invention, since the outermost peripheral position of the opening end is restricted by the restricting portion at any movement position of the counterpart case ( case where the lead-out electric wire is not pulled out) , the inner opening of the electric wire It is possible to reliably prevent entry into the gap.

According to the third aspect of the present invention, when the electric wire is inserted into the electric wire penetration space with the first case and the second case as the open positions, or when the electric wire in the electric wire penetration space is removed to the outside, the first core and the second core Since an electric wire contacts a guard part before contacting an edge part of this, the situation where an electric wire damages (damages) the edge part of a 1st core or a 2nd core can be prevented.

  According to the fifth aspect of the present invention, since the first core and the second core are connected at an appropriate position by the guides of both guard portions, the leakage magnetic flux can be prevented as much as possible, and an appropriate measurement can be performed as much as possible. In particular, if the end portion of the first core and the end portion of the second core are connected by fitting into the gap between the laminated ferromagnetic materials, the end portion can be reliably fitted.

  According to the sixth aspect of the present invention, when the first case and the second case are in the closed position and the single elastic lock arm is operated in the unlocking direction, the first case and the second case are released from the closed position. Since it can be moved to a position, the operator can operate with one hand and the operability is good.

According to a seventh aspect of the present invention, the operator fixes the case side which is derived wire is pulled out, the case side to derive the wire is not pulled out is better to rotating operation facilitate rotation operation, such an operation form Since the lock can be released by this, the operability is further improved.

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

1 to 8 show an embodiment of the present invention, FIG. 1 is a perspective view of an open state of the current transformer, FIG. 2 is a front view of the current transformer in which the first case and the second case are closed positions, Figure 3 is a fragmentary front view of the current transformer is first case and the second case is the open position, Figure 4 showing the periphery of the open end of both the side closer to the rotation support portion of the first case and the second case FIG. 5 is a perspective view of the main part showing the periphery at the opening end of the first case farther from the rotation support part, and FIG. 6 is the main part showing the periphery at the opening end of the second case farther from the rotation support part. FIG. 7 is a main part plan view showing a state in which both guard parts are guiding each other, and FIG. 8 is a perspective view showing a current transformer in use.

  As shown in FIGS. 1 to 3, the current transformer 1 has a first case 2 and a second case 3. The first case 2 and the second case 3 are rotatably connected to each other by a rotation support portion 4 at one end side. The first case 2 and the second case 3 are not illustrated, but are configured by assembling two divided case members. The first case 2 and the second case 3 have semicircular arc-shaped depression surfaces 2c and 3c on surfaces opposed to each other, and are surrounded by the semicircular arc-shaped depression surfaces 2c and 3c. A wire penetration space 10 is formed. Further, the first case 2 and the second case 3 have open ends 2a, 2b, 3a, 3b on opposite sides of the semicircular arc-shaped recessed surfaces 2c, 3c. The insides of the first case 2 and the second case 3 are opened from the open ends 2a, 2b, 3a, 3b, respectively.

Inside the first case 2, a first core 5 and a first shield plate 6 covering the three sides thereof are arranged. Also inside the second case 3, a second core 7 and a second shield plate 8 covering the three sides thereof are arranged. The first core 5 and the second core 7 are each constituted by a plurality of laminated L-shaped ferromagnetic material plates. As shown in FIGS. 3 to 5, both end portions 5 a and 7 a of the first core 5 and the second core 7 are formed by alternately repeating the protruding position and the retracting position of the both end positions of the laminated ferromagnetic material plates. It is provided in a comb blade shape. Both end portions 5 a of the first core 5 having a comb blade shape are exposed in a protruding state from the open ends 2 a and 2 b on both sides of the first case 2. The comb blade-shaped end portions 7 a of the second core 7 are exposed in a protruding state from the open ends 3 a and 3 b on both sides of the second case 3. When the comb-blade end portion 5a of the first core 5 and the comb-blade end portion 7a of the second core 7 opposed to the first core 5 are arranged at appropriate positions , the ferromagnetic material plates engage with each other. It is set as follows.

  In addition, coils (not shown) are wound around the outer circumferences of the first core 5 and the second core 7. Both ends of these coils are connected to an electric wire 9 for guiding an electric current flowing in the coils, and the electric wire 9 is drawn out from an electric wire drawing portion 11 of the first case 2.

  The first case 2 and the second case 3 have both open ends 2a, 2b facing each other and an open position (the state shown in FIGS. 1 and 3) where the open ends 2a, 2b, 3a, 3b facing each other are separated. , 3a, 3b are shifted by rotation between the closed positions (the state shown in FIG. 2) where they contact.

In the open position, as shown in FIG. 1, FIG. 3, the first casing 2 and the second side closer to the rotation supporting portion 4 of the case 3 both opening end 2a, 3a inner opening gap 12 between is formed At the same time, a wire entrance / exit gap 13 is formed between the open ends 2b, 3b of the first case 2 and the second case 3 on the side farther from the rotation support portion 4. The electric wire W can be inserted into the electric wire penetration space 10 surrounded by the first case 2 and the second case 3 from the electric wire entrance / exit gap 13 or the electric wire W of the electric wire penetration space 10 can be removed to the outside.

  In the closed position, as shown in FIG. 2, the electric wire penetration space 10 surrounded by the first case 2 and the second case 3 is closed, and both end portions 5a and 7a of the first core 5 and the second core 7 are fitted. Connected when connected. As a result, a closed magnetic path is formed by the first core 5 and the second core 7. The closed magnetic path is shielded by the first shield plate 6 and the second shield plate 8 on the entire peripheral surface except the inner peripheral surface thereof.

As shown in detail in FIGS. 1 and 4, in the vicinity of the opening ends 2 a and 3 a on both sides of the first case 2 and the second case 3 near the rotation support portion 4 , there is an inner opening gap 12 from the wire penetration space 10. A pair of restricting portions 20 for restricting the entry of the electric wire W into the wire are provided. The pair of restricting portions 20 are provided in the first case 2 having the wire lead-out portion 11. The pair of restricting portions 20 are arranged so as to move along the outer surface of the second case 3. The shape of the outer peripheral end 20 a of each restricting portion 20 is an arc shape along the movement locus of the outermost peripheral position of the opening end 3 a of the second case 3.

  As shown in detail in FIGS. 5 and 6, a pair of first guard portions 21 and a pair of first guard portions 21 are provided at the opening ends 2 b and 3 b of the first case 2 and the second case 3 on the side farther from the rotation support portion 4. Two guard portions 22 are provided. The pair of first guard portions 21 and the pair of second guard portions 22 are provided in the first case 2 and the second case 3, respectively. When viewed from the front, the pair of first guard portions 21 and the pair of second guard portions 22 protrude from the protruding end portions 5a and 7a of the first core 5 and the second core 7, respectively (see FIG. 3). However, the minimum width D2 of the first guard portion 21 and the second guard portion 22 in the open position is set to a size larger than the diameter D1 (shown in FIG. 2) of the wire penetration space 10. Further, as shown in FIG. 7, the pair of first guard portions 21 and the pair of second guard portions 22 are both in the rotating process between the open position and the closed position of the first case 2 and the second case 3. Are set to guide each other so as to move along a relatively appropriate movement trajectory. More specifically, the inner surfaces of the pair of second guard portions 22 slide on the outer surfaces of the pair of first guard portions 21 in the overlapping rotation process of the first and second guard portions 21 and 22.

  As shown in detail in FIGS. 5 and 6, a single locking means 23 is provided on both the opening ends 2 b and 3 b side of the first case 2 and the second case 3 on the side farther from the rotation support portion 4. Yes. The single locking means 23 includes an elastic lock arm 24 provided on the back side of the second case 3 and a locked portion 25 provided on the back side of the first case 2 and engaged with the elastic lock arm 24. It is configured. In the elastic lock arm 24, the rotation direction R1 from the closed position of the second case 3 to the open position is the unlocking direction F. The elastic lock arm 24 is provided in the second case 3 where the wire lead-out portion 11 is not provided.

  Next, a procedure for measuring the leakage current of the electric wires W arranged in the distribution board or the like using the current transformer 1 will be described. As shown in FIG. 8, the electric wires W are usually arranged in the vertical direction inside a distribution board or the like.

  The current transformer 1 is set to the open position of FIGS. 1 and 3, and the electric wire W to be measured is inserted into the electric wire penetration space 10 through the electric wire entrance / exit gap 13. When the electric wire W is inserted into the electric wire penetration space 10, the first case 2 and the second case 3 are relatively rotated with the rotation support portion 4 as a fulcrum, and the current transformer 1 is set to the closed position in FIG. In the closed position, the elastic lock arm 24 of the single locking means 23 is locked by being bent and restored, and held in the closed position (see FIG. 8).

  When a leakage current flows through the electric wire W, a magnetic flux proportional to the current is generated in the closed magnetic path composed of the first core 5 and the second core 7, and a current proportional to the magnetic flux flows through a coil (not shown). Leakage current can be measured. When the measurement is completed, the operator unlocks the single locking means 23, relatively rotates the first case 2 and the second case 3 to the open position, and the electric wire W in the electric wire penetration space 10 is connected to the electric wire entrance / exit gap 13. Remove outside.

  The current transformer 1 can be applied to an insulation monitoring device that monitors the ground insulation resistance in the low-voltage side electric circuit of the power receiving transformer using a leakage current that circulates through the electric circuit and the ground to the class B ground line.

  As described above, in the current transformer 1, the first case 2 is provided with a pair of restriction portions 20 that restrict the entry of the wire W from the wire penetration space 10 into the inner opening gap 12. Accordingly, when the electric wire W is inserted into the electric wire penetration space 10 with the first case 2 and the second case 3 being in the open position, even if the electric wire W attempts to enter the inner opening gap 12, the entry is blocked by the restricting portion 20. The Accordingly, it is possible to prevent various problems caused by the electric wire W being sandwiched between the opening ends 2 a and 3 a of both the first case 2 and the second case 3. Specifically, there is no fear of damaging (damaging) the electric wire W, and there is no fear of damaging (damaging) the end portions 5a and 7a of the first core 5 and the second core 7, and smooth measurement work is possible. It is.

Further, the pair of restricting portions 20, since it has also a function of preventing intrusion of dust into the inner opening gap 12, the connection portion between the first core 5 and second cores 7 by dust or the like, that is, the end portion The leakage magnetic flux of 5a, 7a can be prevented as much as possible. In particular, as shown in FIG. 8, it is useful for preventing entry of dust or the like when the electric wires W are arranged vertically.

  The pair of restricting portions 20 are provided in the first case 2 from which the electric wires W are drawn, and are arranged so as to move along the outer surface of the second case 3 on the counterpart side. Therefore, it is easier for the operator to rotate the first case 2 side from which the electric wire W is drawn and to rotate the second case 3 side from which the electric wire W is not drawn. Since the restricting portion 20 is also on the fixed side, the relative rotation between the first case 2 and the second case 3 can be performed even when the operator holds the restricting portion 20, so that the operability is good.

The pair of restricting portions 20 may be provided in the second case 3 or in both the first case 2 and the second case 3.

  The shape of the outer peripheral end 20 a of each restricting portion 20 is an arc shape along the movement locus of the outermost peripheral position of the opening end 3 a of the second case 3. Accordingly, since the outermost peripheral position of the opening end 3a is restricted by the restricting portion 20 at any movement position of the second case 3, it is possible to reliably prevent the wire W from entering the inner opening gap 12. .

  The opening ends 2b, 3b on both sides of the first case 2 and the second case 3 farther from the rotation support portion 4 are protruded than the protruding end portions 5a, 7a of the first core 5 and the second core 7. 1 and 2nd guard parts 21 and 22 are provided, respectively. Therefore, when the electric wire W is inserted into the electric wire penetration space 10 with the first case 2 and the second case 3 as the open positions, or when the electric wire W of the electric wire penetration space 10 is removed to the outside, the first core 5 and the second core 7 is in contact with the first and second guard portions 21 and 22 before the wire W comes into contact with the end portions 5a and 7a of the wire 7, so that the wire W is damaged to the end portions 5a and 7a of the first core 5 and the second core 7. (Damage) can be prevented.

  The first guard portion 21 of the first case 2 and the second guard portion 22 of the second case 3 are relatively rotated during the rotation process between the open position and the closed position of the first case 2 and the second case 3. It is configured to move while guiding along an appropriate movement trajectory. Therefore, since the first core 5 and the second core 7 are connected at an appropriate position by the guides of the first and second guard portions 21 and 22, leakage magnetic flux can be prevented as much as possible, and appropriate measurement can be performed as much as possible. In particular, the first core 5 and the second core 7 are laminated in a state where the plates of the ferromagnetic material are alternately displaced, and the end 5a of the first core 5 and the end 7a of the second core 7 are stacked. Can be reliably fitted to each other by being fitted into a gap between the laminated ferromagnetic materials.

The first guard portion 21 and the second guard portion 22, since it has also a function of preventing intrusion of dust into the wire inlet and outlet for the gap 13, between the first core 5 due to dust or the like of the second core 7 It is possible to prevent leakage magnetic flux at the connecting portion, that is, the end portions 5a and 7a as much as possible. In particular, as shown in FIG. 8, it is useful for preventing entry of dust or the like when the electric wires W are arranged vertically.

  The first case 2 and the second case 3 are locked on the open ends 2b and 3b on the side farther from the rotation support portion 4 and on the back surfaces of the first case 2 and the second case 3 in the closed position. The locking means 23 is composed of an elastic lock arm 24 and a locked portion 25, and the elastic lock arm 24 is released from the closed position of the first case 2 and the second case 3. The rotation direction R1 to the position is the unlocking direction F. Therefore, if the first case 2 and the second case 3 are in the closed position and the single elastic lock arm 24 is operated in the unlocking direction F, the first case 2 and the second case 3 are released from the closed position. Therefore, the operator can operate with one hand and the operability is good.

  The elastic lock arm 24 is provided in the second case 3 from which the electric wire 9 is not pulled out. Accordingly, it is easier for the operator to rotate the first case 2 side from which the electric wire 9 is pulled out and to rotate the second case 3 side from which the electric wire 9 is not pulled out. Since the lock can be released, operability is even better.

It is a front view of the open state of the current transformer which shows embodiment of this invention. It is a front view of a current transformer which shows an embodiment of the present invention and a first case and a second case are closed positions. It is a front view of a current transformer which shows an embodiment of the present invention and a 1st case and a 2nd case are an open position. It is a principal part perspective view which shows embodiment of this invention and shows the periphery of both the opening ends of the near side of the rotation support part of a 1st case and a 2nd case. It is a principal part perspective view which shows embodiment of this invention and shows a periphery at the opening end of the side far from the rotation support part of a 1st case. It is a principal part perspective view which shows embodiment of this invention and shows a periphery at the opening end of the side far from the rotation support part of a 2nd case. It is a principal part top view which shows the state which shows embodiment of this invention and both guard parts are mutually guiding. It is a perspective view which shows embodiment of this invention and shows the use condition of a current transformer. It is a front view of the current transformer which shows a prior art example and a 1st case and a 2nd case are an open position. It is a front view of the current transformer which shows a prior art example and a 1st case and a 2nd case are blockade positions. It is a side view which shows a pair of locking means of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Current transformer 2 1st case 2a, 2b Open end 3 2nd case 3a, 3b Open end 4 Rotation support part 5 1st core 7 2nd core 10 Wire penetration space 12 Inner opening clearance 13 Wire entrance / exit clearance W Electric wire

Claims (7)

A first case in which the first core is housed and the ends of the first core are exposed from the open ends on both sides;
A second case in which the second core is housed and the end portions of the second core are exposed from the open ends on both sides;
The first case and the second case are rotatably connected between an open position where both opening ends facing each other are separated from each other and a closed position where both opening ends facing each other are in contact with each other,
In the open position, an inner opening gap is formed between the opening ends of both the first case and the second case on the side close to the rotation support portion , and the first case and the second case are supported for rotation. A wire entrance / exit gap is formed between the opening ends on the side farther from the section, and the wire is inserted / extracted through the wire entrance / exit space surrounded by the first case and the second case. Can
In the closed position, both the inner opening gap and the wire entrance / exit gap are closed, and both end portions of the first core and the second core are connected to each other so that a predetermined magnetic field is generated by the first core and the second core. In the current transformer where the path is formed,
Of the first case and the second case, in the case where the lead-out wire for leading the current flowing in the coil is drawn out, the wire enters the inside opening gap from the wire penetration space. A pair of restricting parts for restricting are provided ,
The pair of restricting portions are arranged so as to move along the outer surface of the case where the lead-out wire is not drawn out,
A current transformer characterized by that. The current transformer according to claim 1,
The shape of the outer peripheral ends of the pair of restricting portions is an arc shape along the movement locus of the outermost peripheral position of the opening end of the case where the lead-out electric wire is not drawn out .
A current transformer characterized by that. A current transformer according to claim 1 or claim 2, wherein
A pair of guard portions projecting from the projecting end portions of the first core and the second core are respectively provided at both open ends of the first case and the second case on the side farther from the rotation support portion. Being
A current transformer characterized by that. The current transformer according to claim 3 ,
The pair of guard portions of the first case and the pair of guard portions of the second case are introduced in the process of movement between the open position and the closed position of the first case and the second case. The inner surfaces of the pair of guide portions of the case where the lead-out electric wires are not drawn slide along the outer surfaces of the pair of guide portions of the case where the wires are drawn.
A current transformer characterized by that. The current transformer according to claim 3 ,
The pair of guard portions of the second case and the pair of guard portions of the first case is a transfer process between an open position and a closed position of the second case and the first case, both the relative Guide you to move along the proper trajectory ,
A current transformer characterized by that. A current transformer according to any one of claims 1 to 5,
In the open end side of both the first case and the second case the farther from the rotating support side, and, in each rear surface of the second case and the first case is locked in the closed position A single locking means is provided,
The locking means includes an elastic lock arm and a locked part,
Said resilient locking arm, the rotation direction to the open position from the closed position of the second case and the first case there is a lock releasing direction,
A current transformer characterized by that. The current transformer according to claim 6,
The elastic lock arm is provided on the case side where the lead- out wire is not drawn out ,
A current transformer characterized by that.

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