JPH11250971A - Connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve commercial power frequency breakdown voltage while maintaining compatibility with a test connector available on the market. SOLUTION: Around a lead wire 56 serving as an earth and a female terminal (b), a wall 76 is formed projectingly in the vertical direction of a lower insert 72. Therefore, an insulation distance between the power and the earth is increased as against that of one without wall 76, so that a commercial power frequency breakdown voltage value can be improved. As the position of the female terminal is not changed, compatibility with test connector on the market can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a connector used as a part of a switch body control section.

[0002]

2. Description of the Related Art Conventionally, a switch has a ground fault relay which detects a zero-phase current through a zero-phase current transformer (ZCT) provided on a distribution line when a ground fault occurs in a distribution line. It is connected. The ground fault relay operates a trip coil provided inside the switch based on the ground fault detection signal, and automatically opens the switch to quickly disconnect the ground fault section from the sound line. The relay uses a ground fault characteristic tester prepared separately for monthly inspection and annual inspection, and is required to perform a characteristic test such as whether a switch can be opened within a predetermined time in the event of a ground fault. The ground fault characteristic test is
The test plug connector of the ground fault characteristic tester is used as a part of the control unit of the switch body, and a connector for ground fault characteristic check (hereinafter, referred to as “GR”) connected between the switch and the ground fault relay. Check connector ”).

In the GR check connector, a plurality of female contact pins are provided. In a normal state (during a non-grounding characteristic test), a plurality of male contact pins corresponding to the female contact pins are connected. The provided plug connector is connected. At the time of the ground fault characteristic test, the plug connector is disconnected from the GR check connector, and a test plug connector is connected to the GR check connector.

The GR check connector and the plug connector are provided with a metal inner hood and a resin outer hood, respectively. The GR check connector and the plug connector are configured such that a plug connector is inserted into the GR check connector, and a metal connection nut provided on the outer periphery of the plug connector is screwed into a female screw portion formed on the outer periphery of the GR check connector. The connection is fixed by joining. A lead wire is connected to the base end of the female contact pin provided in the GR check connector by crimping, soldering, or the like, and is drawn out of the outlet of the GR check connector to the outside of the connector. Connected to internal terminal block and switch.

The commercial frequency withstand voltage between the female contact pins provided in the GR check connector is 1000.
V, 1 minute performance. In addition, the control unit commercial frequency withstand voltage value of the switch body is 2000 V and has a performance of 1 minute. Since the GR check connector is used as a part of the control unit of the switch body, the voltage application point of the GR check connector requires characteristics equivalent to the commercial frequency withstand voltage value of the control unit of the switch body. That is, it is necessary to improve the commercial frequency withstand voltage value of the GR check connector. As a countermeasure for improving the commercial frequency withstand voltage value of the GR check connector, the distance between a specific contact pin that requires an increase in the commercial frequency withstand voltage value and another contact pin is increased, or another one having a higher commercial frequency withstand voltage value is used. Or had to use a connector.

[0006]

However, as described above, the conventional countermeasure for improving the commercial frequency withstand voltage value is to change the mutual interval of the contact pins provided in the GR check connector or to use another connector. Or to use. That is, a GR check connector having a different contact pin number and a different arrangement of contact pins from the GR check connector conventionally distributed in the market is used. For this reason, there has been a problem that the compatibility between the GR check connector for which the measure for improving the commercial frequency withstand voltage value has been taken and the conventionally used test connector is lost.

When a waterproof function is added to the GR check connector, it is necessary to provide an airtight structure in the contact pin portion and the lead wire insertion portion. For this reason, there has been a problem that the outer diameter is larger than that of a general connector having the same level of commercial frequency withstand voltage, and the cost is relatively high.

Further, the GR check connector is housed in a small space in the control device. A terminal block is provided in the control device, and the terminal block is mounted in a state where a power supply unit, an operation output unit, and the like are exposed. For this reason, there is a possibility that a short circuit failure may be caused by contact between the metal inner hood of the GR check connector and the plug connector or the metal connection nut of the plug connector and the terminal block in the control device.

The present invention has been made to solve the above problems, and a first object of the present invention is to provide a connector capable of improving the withstand voltage characteristic of a commercial frequency.

A second object is to provide a connector capable of improving the withstand voltage of the commercial frequency without changing the position of the contact pin. The third purpose is
It is an object of the present invention to provide a connector capable of improving a commercial frequency withstand voltage value while maintaining compatibility with a test connector that has been conventionally distributed on the market.

A fourth object is to provide a connector provided with a waterproof function. A fifth object is to provide a connector provided with a waterproof function without increasing the size and cost.

A sixth object is to provide a connector capable of preventing a short-circuit failure or the like due to contact between the terminal block and the connector.

[0013]

According to a first aspect of the present invention, there are provided a plurality of terminals including a ground terminal, which are connected between a switch and a control device provided separately from the switch. The gist of the connector is that commercial frequency withstand voltage value improving means is provided at least around the ground terminal of the connector.

According to a second aspect of the present invention, in the first aspect of the present invention, the means for improving the commercial frequency withstand voltage value includes an insulation distance for extending an insulation distance between a ground terminal and a terminal other than the ground terminal. The gist is that it is an extended structure.

According to a third aspect of the present invention, in the first or second aspect of the invention, the insulating distance extending means includes a wall surface, a groove, a barrier, an insulator layer, a space provided around a ground terminal. The gist is one of the following.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the outside of the connector is molded with rubber or resin, and a sealing structure is provided at the connector coupling portion. That is the gist.

According to a fifth aspect of the present invention, in the fourth aspect, the sealing structure is a packing. The invention according to claim 6 is the invention according to claims 1 to
The gist of the invention according to any one of claims 5 and 6 is that the portions other than the current-carrying portion are formed of an insulator.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment in which the present invention is embodied in a ground fault relay of a switch will be described below with reference to FIGS.

As shown in FIG. 9, an arm pole 11 is provided above the utility pole 10, and a switch 12 is fixed to the arm pole 11. A housing case 1 is provided below the telephone pole 10.
3 are provided, and a switch 1 is provided in the accommodation case 13.
A ground fault relay 14 as a control device 2 is housed and fixed. The ground fault relay 14 is connected to the switch 12 via a control line 15, and a ground fault characteristic tester 16 is connected to the ground fault relay 14 via a connection cable 17 during a ground fault characteristic test. It has become so.

As shown in FIG. 8, the switch 12 is a directional overcurrent lock type high pressure air switch.
An opening / closing section 19 that is opened / closed by an external operation handle (not shown) is provided on the distribution line 18 of each of the U, V, and W phases. In FIG. 8, the distribution line 18 is connected to the power supply side on the left side and to the load side on the right side. A trip coil 20 for automatically tripping the opening / closing section 19 is connected to the opening / closing section 19 via one end of a microswitch 21. The trip operation is an operation of detecting a ground fault current flowing through the distribution line 18 when a ground fault occurs, and automatically separating (opening) the switching unit 19 instantaneously if the ground fault current is equal to or more than a set value. is there.

When a ground fault current exceeding the set value flows through the distribution line 18, the trip coil 20 is excited and the switch 1 is turned on.
2 is automatically opened. Also, in the event of a merger of ground fault and overcurrent in distribution line 18,
The ground fault trip circuit is opened by giving priority to an overcurrent accident, and a circuit breaker (not shown) of the substation operates to open after the distribution line 18 is shifted to a non-charged state.

The other end of the microswitch 21 is connected to an overcurrent relay (OCR) 22, and the overcurrent relay 22 includes a pair of trip relays 23 and 24. Common terminal 23 of the one trip relay 23
C is connected to the normally closed contact 24A of the other trip relay 24. If an overcurrent equal to or greater than the lock current value occurs in the U-phase or W-phase on the load side, the trip relay 23,
24 actuators 23D and 24D are normally open contacts 23
B, 24B. The actuator 21A of the microswitch 21 opens and closes in conjunction with the opening and closing operation of the opening and closing unit 19.

On the power supply side on the distribution line 18, a U-phase
-Phase current transformer (Z
CT) 25, and a ground fault test current is provided around a core (not shown) of the zero-phase current transformer 25 during a ground fault characteristic test for confirming whether or not the operation of the ground fault relay 14 is normal. The test wire 26 for flowing the fluid is wound. In addition, between the switching unit 19 on the distribution line 18 and the overcurrent relay 22,
A zero-phase voltage detection capacitor (ZPD) 27 is provided for selectively protecting a ground fault on the load side and a ground fault on the power supply side.

On the other hand, the grounding relay 14 has a terminal block 28.
The terminal block 28 is provided with terminals A to M. The terminals E and F are power supply terminals, and a control power supply (AC 100 V) P is connected to the terminals E and F. The terminal E is on the power supply side, and the terminal F is on the ground side. Further, a ground fault relay 14 is provided between the terminal L and the terminal M.
Outputs a trip signal to the trip coil 20 in response to the detection of a ground fault of the zero-phase current transformer 25 and performs a trip operation.
9 is connected.

One end of the zero-phase current transformer 25 is connected to a terminal A via a control line 40, and the other end is connected to a terminal B via a control line 41. One end of the zero-phase voltage detecting capacitor 27 is connected to a terminal C via a control line 42.
, And the other end is connected to a terminal D via a control line 43. Normally open contact 2 of the trip relays 23 and 24
3B and 24B are connected to a terminal H via a control line 44. One end of the test line 26 is connected to a terminal J via a control line 45, and the other end is connected to a terminal K via a control line 46.
It is connected to the.

At the time of the ground fault characteristic test, a ground fault characteristic check connector (hereinafter referred to as "GR check connector") 51 to which a test plug connector (not shown) of the ground fault characteristic tester is connected. Are provided with female terminals (female contact pins) a to j. In a normal state (at the time of a non-grounding characteristic test) for monitoring a ground fault accident on a distribution line, the normal plug connector 52 connected to the GR check connector 51 is connected to the female terminals a to j, respectively. Plug terminals (male contact pins) kt are provided.

The above-mentioned female terminals a and D, female terminals c and J, female terminals d and K, female terminals g and G, female terminals h and I, female terminals i and terminals The terminal E and the female terminal j are connected to the terminal F by lead wires 55, 57 to 62, respectively. A lead wire 56 is connected to the female terminal b. The female terminal b is connected to the case of the switch 12 so that the first terminal of the female terminal b is grounded. One ends of the lead wires 63 and 64 are connected to the female terminals e and f.

A control line 47 is connected to the trip coil 20. The control line 47 is connected to the lead wire 63 by a sleeve 65. That is,
The trip coil 20 includes a control wire 47 and a lead wire 63.
Is connected to the female terminal e. A control line 48 is connected to a common terminal 24C of the trip relay 24, and the control line 48 is connected to the lead wire 64 by a sleeve 66. That is, the common terminal 24
c is connected to the female terminal f via the control line 48 and the lead wire 64.

During the ground fault characteristic test, the common plug connector 52 is disconnected from the GR check connector 51, and a test plug connector (not shown) of a ground fault characteristic tester is connected to the GR check connector 51. The ground fault test current generated by the ground fault tester flows to the terminal J via the lead wire 57, and is output from the terminal J to the zero-phase current transformer 25 via the control line 45. Then, the zero-phase current transformer 2
The test current that has passed through the test wire 26 of No. 5 is input to the terminal K, and then output to the ground fault characteristic tester via the lead wire 58, the female terminal d, and the test plug connector.

Next, the structure of the GR check connector 51 will be described in detail. As shown in FIG. 1, the GR check connector 51 includes a plurality of female terminals a to j as current-carrying portions for electrical connection, and an upper portion as an insulator for separating and insulating each of the female terminals a to j. An insert 71 and a lower insert 72, a resin inner hood 73 and a resin outer hood 74 for holding and protecting the inserts 71 and 72, and a fixing ring 75 for holding and fixing the inserts 71 and 72 in the inner hood 73. And lead wires 55 to 66 (partially omitted in FIG. 1) connected to the female terminals a to j (partially omitted in FIG. 1).

Insert holes 71A and 72A corresponding to the number of female terminals a to j are formed in each of the inserts 71 and 72, and a through hole 7 is formed at the tip of the insert hole 71A.
The contact surface 71B is formed by making the diameter smaller than 1A. The upper insert 71 has a flange 71C, and the lower insert 72 has a flange 72C.

A female screw 73A is formed on the outer periphery of the distal end of the inner hood 73 and a flange 73B is formed on the outer peripheral surface of the inner hood 73. An annular engaging portion 73C is formed on the inner periphery of the inner hood 73.
Are formed. The GR check connector 5
Since an external load is less likely to be applied to 1, not much strength is required, and the internal hood 73 serving as a connection portion between the connectors can be the internal hood 73 made of resin.

The outer hood 74 can be divided into two parts in a plane along the axial direction, and an annular groove 74A corresponding to the shape of the flange 73B of the inner hood 73 is formed at the upper end of each inner periphery. The outer hood 74 has through holes 74B formed at the upper left and right ends of the outer periphery. At the base end of the outer hood 74, a lead portion K for drawing out the lead wires 55 to 66 to the outside is formed.

In the GR check connector 51, first, female terminals a to j are connected to lead wires 55 to 66 by soldering, respectively. Then, the flange 71C of the upper insert 71 and the flange 72C of the lower insert 72 are backed to each other. Then, the inserts 71 and 72 are press-fitted from the lower insert 72 side to the positions where the tips of the female terminals a to j come into contact with the contact surface 71C of the upper insert 71 using a dedicated tool. That is, the female terminals a to j, the lead wires 55 to 66, the upper insert 71 and the lower insert 72 are integrally assembled.

Next, the integrated insert 71,
72 is inserted until the flange 71 </ b> C of the upper insert 71 comes into contact with the locking portion 73 </ b> C of the inner hood 73, and the fixing ring 75 is mounted from below the inner hood 73. The flange 72C of the lower insert 72 is provided with a fixing ring 75.
That is, the inserts 71 and 72 are prevented from falling out of the inner hood 73 by the fixing ring 75. A space S is formed between the inner peripheral surface of the inner hood 73 and the outer peripheral surface of the upper insert 71.

Thereafter, the inner hood 73 is connected to the flange 73B.
The pair of external hoods 74 is fixed by inserting the bolt (not shown) into the through hole 74A of the external hood 74 and screwing it into the nut so that the outer hood 74 and the groove 74A correspond to each other. Is done. The inner hood 73
The vertical movement of the outer hood 74 with respect to the outer hood 74 is restricted by locking the flange 73A into the groove 74A. For this reason, the inner hood 73 is
There is no escape from 4.

On the other hand, as described above, the lead wire 56 is a ground wire connected to the case 12A of the switch 12, and the female terminal b connected to the lead wire 56 is a ground terminal. Around the lead wire 56 of the lower insert 72 and the female terminal b to which the lead wire 56 is connected, a wall surface 76 as a commercial frequency withstand voltage value improving means is formed so as to protrude in the vertical direction of the lower insert 72. ing.
That is, the insulation distance (creeping distance) between the power supply terminal (lead wire 57 and the like) and the ground terminal (lead wire 56 and the like) is longer than when the wall surface 76 is not formed. Since a concave portion 77 corresponding to the wall surface 76 is formed below the upper insert 71, the upper insert 71 and the lower insert 72 are in close contact with each other.

Next, the structure of the common plug connector 52 will be described. Since the common plug connector 52 has a structure similar to that of the GR check connector 51, a detailed description thereof will be omitted, and only a portion different from the GR check connector 51 will be mainly described.

As shown in FIG. 1, the common plug connector 52 includes a plurality of plug terminals kt (partially not shown in FIG. 1) as current-carrying portions for electrical connection, and the plug terminals kt. Insert 79 and lower insert 80 as insulators for isolating and fixing
9 and 80, a resin inner hood 81 and a resin outer hood 82 for holding and protecting the inserts 79 and 80.
A fixing ring 83 for holding and fixing the inside of the internal hood 81 and a connection nut 84 made of resin for connecting and fixing the common plug connector 52.

A flange-shaped step portion 81 is formed on the outer periphery of the internal hood 81 of the common plug connector 52, and the inside of a resin connection nut 84 is locked to the step portion 81A. That is, the step portion 81A is connected to the connection nut 84.
Located inside. The outer diameter of the inner hood 81 is formed to be slightly smaller than the inner diameter of the inner hood 73 of the GR check connector 51.

The common plug connector 52 has a function as a jumper of the GR check connector 51 during the non-grounding characteristic test, and is formed at the base end of the external hood 82 of the common plug connector 52. The lead wire is not drawn out from the outlet 82A.
Therefore, the outlet 82A is sealed by being filled with an insulating rubber material 85. The plug terminal 1 connected to the female terminal b of the GR check connector 51
Around the wall to improve the withstand voltage of the commercial frequency.
6 are formed to project.

The connection between the GR check connector 51 and the regular plug connector 52 is performed first by using the regular plug connector 5.
2 is inserted into the space S of the GR check connector 51, and the plug terminals k to
Insert t. Then, the connection nut 84 of the regular plug connector 52 is connected to the female screw 73A of the GR check connector 51.
Screw. At the time of the ground fault characteristic test, the GR check connector 5 was used instead of the regular plug connector 52.
The test plug connector connected to 1 can be connected in the same manner as the regular plug connector 52.

Therefore, according to the present embodiment, the following effects can be obtained. In the lower insert 72, a wall surface 76 is formed so as to protrude around the female terminal b serving as a ground terminal. For this reason, the insulation distance (creepage distance) between the power supply terminal and the earth terminal in each of the female terminals a to j is extended, and the commercial frequency withstand voltage between the female terminals a to j can be improved. it can.

Further, the arrangement intervals of the female terminals a to j are not increased to improve the commercial frequency withstand voltage value, and another connector having a high commercial frequency withstand voltage value is not used. Since there is no significant change in the shape of the connector, it is possible to maintain compatibility with a test plug connector that has been conventionally distributed on the market. Therefore, the GR check connector 51 is maintained while maintaining compatibility with the test plug connector.
Therefore, the performance and maintenance of the GR check connector 51 can be easily performed.

The inner hood 73 and the outer hood 74 of the GR check connector 51, the common plug connector 52
Inner hood 81, outer hood 82 and connection nut 84
Is formed of an insulating resin, that is, the outer surface of the connector is formed of an insulator. For this reason, when it is stored in a small space inside the control device, there is little possibility that a ground fault will occur even if it is in contact with a terminal block or the like. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 2, the present embodiment is different from the first embodiment in that the upper wall 76 of the lower insert 72 is replaced by a projection 86 having a substantially triangular cross section.
The first embodiment differs from the first embodiment only in that a concave portion 87 on one lower surface is formed corresponding to the protrusion 86. Therefore,
In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

Around the female terminal b to which the lead wire 56 of the lower insert 72 is connected, a projection 86 as a commercial frequency withstand voltage improving means is formed to project from the upper surface of the lower insert 72. On the lower surface of the lower insert 72, a wall surface 76 as a commercial frequency withstand voltage value improving means is formed so as to protrude from the lower surface of the insert 72. That is, a recess 87 is formed between the protrusion 86 and the female terminal b to which the lead wire 56 is connected.
Thereby, the insulation distance (creeping distance) between the power supply terminal and the ground terminal is longer than that in the case where the protrusion 86 is not formed. Further, since a concave portion 87 corresponding to the projection 86 is formed on the lower surface of the upper insert 71, the upper insert 71 and the lower insert 72 are in close contact with each other.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 3, in this embodiment, the projection 86 on the upper surface of the lower insert 72 is replaced by a barrier 89 formed around the female terminal b, and the recess 90 on the lower surface of the upper insert 71 is formed. Only the point corresponding to the barrier 89 is different from that of the second embodiment. Therefore, in the present embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and duplicate description will be omitted.

Around the female terminal b to which the lead wire 56 of the lower insert 72 is connected, a barrier 89 as a commercial frequency withstand voltage value improving means is formed so as to protrude upward from the lower insert 72. On the lower surface of the lower insert 72, a wall surface 76 as a commercial frequency withstand voltage value improving means is formed so as to protrude. That is, the insulation distance (creepage distance) between the power supply terminal and the ground terminal is longer due to the barrier 89 than in the case where the barrier 89 is not formed.
In addition, the lower surface of the upper insert 71 is provided with the wall surface 76.
Is formed, the upper insert 71 and the lower insert 72 are in close contact with each other.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained. (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 4, in this embodiment, the barrier 89 is omitted, a contraction tube 91 made of insulating rubber is attached to the lower part of the female terminal b to which the lead wire 56 is connected, and the upper insert 71 is formed. The third embodiment differs from the third embodiment only in that the insertion hole 71A of the lower insert 72 and the insertion hole 72A of the lower insert 72 are formed to have a diameter that is increased in accordance with the thickness and length of the shrinkable tube 91. Therefore, in the present embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and the duplicate description will be omitted.

A contraction tube 91 made of insulating rubber is mounted below the female terminal b of the lower insert 72 to which the lead wire 56 is connected, as means for improving the withstand voltage of the commercial frequency. That is, by covering the upper and lower fixed sections of the female terminal b on the contact surface between the upper insert 71 and the lower insert 72 with the insulator, the leakage current is interrupted. It can also be said that the insulation distance (creepage distance) between the power supply terminal and the ground terminal is extended.

Therefore, according to the present embodiment, the following effects can be obtained in addition to the effects similar to the second and third effects of the first embodiment.・ Shrink tubing (insulator) for female terminal b (earth terminal)
By mounting 91, the leakage current is reliably shut off, the insulation distance between the power supply terminal and the ground terminal is extended, and the commercial frequency withstand voltage between the terminals can be improved. (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 5, the present embodiment mainly differs from the above in that the lower outer diameter of each of the female terminals a to j (partially omitted in FIG. 5) is smaller than the inner diameter of the insertion holes 71A and 72A. This is different from the fourth embodiment. Therefore, in the present embodiment, the same components as those in the fourth embodiment are denoted by the same reference numerals, and redundant description will be omitted.

The outer diameter of the lower part of each of the female terminals a to j is formed smaller than the inner diameter of the insertion holes 71A and 72A. For this reason, at the flash portion at the contact surface between the upper insert 71 and the lower insert 72, a gap 92 having a certain distance is formed between each of the female terminals a to j and the insertion holes 71A and 72A. . In other words, the gap 92 extends the insulation distance (space distance) between the power supply terminal and the ground terminal. A wall surface 76 is formed around the lead wire 56 at the lower end of the lower insert 72.

Therefore, according to the present embodiment, the same effects as in the first embodiment can be obtained. (Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 6, in this embodiment, an air layer 93 having a constant width is formed in a fixed section around the female terminal b at a flashing portion at a contact surface between the upper insert 71 and the lower insert 72. Only the point that is different from the fifth embodiment. Therefore, in the present embodiment, the same components as those in the fifth embodiment are denoted by the same reference numerals, and the duplicate description will be omitted.

At the contact surface between the upper insert 71 and the lower insert 72 (the flashing point of the ground portion), a constant width is provided in a certain vertical section around the female terminal b to which the lead wire 56 is connected. An air layer 93 is formed.
That is, the air layer 93 extends the insulation distance (space distance) between the power supply terminal and the ground terminal. A wall surface 76 is formed around the lead wire 56 at the lower end of the lower insert 72.

Therefore, according to the present embodiment, the same effects as in the first embodiment can be obtained. (Seventh Embodiment) Next, a seventh embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7, the present embodiment mainly uses the external hood 74 of the GR check connector 51.
And an outer hood 94 of the common plug connector 52 molded with an insulating rubber or resin.
95 is different from the first to sixth embodiments. Therefore, in the present embodiment, the first to
The same components as those in the sixth embodiment are denoted by the same reference numerals, and redundant description will be omitted.

As described above, the GR check connector 51
The outer hood 94 is molded with rubber or resin. External hood 94 of the GR check connector 51
Is a lead wire 5 connected to each of the female terminals a to j (partially omitted in FIG.
After connecting 5 to 66 (partially not shown in FIG. 7), it is molded including a fixed section of the covering 95 for protecting the lead wires 55 to 66.

The outer hood 96 of the plug connector 52 connected to the GR check connector 51 in a normal state (at the time of the non-grounding characteristic test) is also molded with rubber or resin. A packing 97 as a sealing means is inserted from the opening side of the connection nut 95, and is mounted at a position where it comes into contact with a step 94A formed on the outer periphery of the inner hood 81. When connecting the GR check connector 51 and the plug connector 52, the packing 97 is attached to the inner hood 73 of the GR check connector 51.
It comes into contact with the contact surface 73A at the wire end, and is pressed against and brought into close contact with the contact surface 73A with the tightening of the connection nut 84 of the plug connector 52.

Therefore, according to the present embodiment, the following effects can be obtained in addition to the effects similar to those of the first embodiment. In the GR check connector 51, the external hood 94
Was molded with insulating rubber or resin including a predetermined section of the coating 95. For this reason, water does not enter the inside of the GR check connector 51 via the joint between the inner hood 73 and the outer hood 94 and the like. For this reason, GR
The inside of the check connector 51 can be waterproofed.

A packing 97 is mounted on the stepped portion 81A of the inner hood 81.
When the R check connector 51 and the regular plug connector 52 are connected, the connection nut 84 is tightened and pressed against the contact surface 73 </ b> D of the GR check connector 51 to be in close contact therewith. For this reason, it is possible to prevent water from entering the GR check connector 51 and the regular plug connector 52 from the connection point between the inner hood 81 and the outer hood 96.

The above embodiments may be modified as follows. -As in the seventh embodiment, the outer hood 7 of the GR check connector 51 in the first to sixth embodiments.
4 and the external hood 73 of the common plug connector 52 may be molded with insulating rubber or resin, and a packing 97 may be attached to the common plug connector 52. By doing so, the commercial frequency withstand voltage can be improved, and the GR check connector 51 and the regular plug connector 52 can be provided with a waterproof function.

In the first to seventh embodiments, the upper inserts 71 and 79 and the lower inserts 72 and 80 are used to separate and insulate and fix the female terminals a to j and the plug terminals kt respectively. The upper inserts 71 and 79 and the lower insert 7
2, 80 may be integrally formed as one member. In this way, there is no contact surface between the upper inserts 71, 79 and the lower inserts 72, 80, that is, a path through which a leakage current can flow. As a result, the leakage is reduced and the withstand voltage of the commercial frequency can be improved. .

In the first to seventh embodiments, the inner hoods 73, 94 and the outer hoods 74, 93
The inner hoods 73 and 94 and the outer hood 7
4, 93 may be integrally formed. In this way, the number of parts and the number of assembly steps can be reduced.

In the first to seventh embodiments, the female terminals a to j are respectively connected to the lead wires 5 by soldering.
Although the connection was made at 5 to 66, the connection may be made by crimping using a crimp terminal or the like. In this case, the female terminals a to j
Can be easily connected to the lead wires 55 to 66.

In the fourth embodiment, the shrinkable tube 91 is mounted only on the upper and lower fixed sections of the contact surface between the upper insert 71 and the lower insert 72 around the female terminal b. It may be attached so as to cover the entire length of b. Also in this case, the leakage current from the flash portion can be cut off, and the commercial frequency withstand voltage between the female terminals a to j can be improved.

In the first to fourth embodiments and the sixth embodiment, the commercial frequency withstand voltage improving means is provided only around the female terminal b which is a ground portion. Commercial frequency withstand voltage value improving means may be provided around all of a to j. Even in this case, the female terminals a to
The commercial frequency withstand voltage value between j can be improved.

In the first to sixth embodiments, the commercial frequency withstand voltage improving means is provided only around the female terminal b which is a grounding part. The commercial frequency withstand voltage value improving means may be provided only around the female terminals a to j other than the above. Also in this case, the commercial frequency withstand voltage between the female terminals a to j can be improved.

[0072]

According to the first aspect of the present invention, the commercial frequency withstand voltage characteristics can be improved.

According to the second aspect of the present invention, the commercial frequency withstand voltage can be improved without changing the position of the contact pin. According to the third aspect of the present invention, it is possible to improve the commercial frequency withstand voltage value while maintaining compatibility with a test connector that has been conventionally distributed.

According to the fourth aspect of the present invention, a waterproof function can be added to the connector. According to the invention described in claim 5, a waterproof function can be added to the connector without increasing the size and cost.

According to the invention described in claim 6, short-circuit failure or the like due to contact between the terminal block and the connector can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a connector according to a first embodiment.

FIG. 2 is a sectional view of a connector according to a second embodiment.

FIG. 3 is a sectional view of a connector according to a third embodiment.

FIG. 4 is a sectional view of a connector according to a fourth embodiment.

FIG. 5 is a sectional view of a connector according to a fifth embodiment.

FIG. 6 is a sectional view of a connector according to a sixth embodiment.

FIG. 7 is a sectional view of a connector according to a seventh embodiment.

FIG. 8 is a connection diagram showing connection of a connector to a switch and a relay.

FIG. 9 is an explanatory diagram showing a state in which a switch, a relay, and a tester are attached to a utility pole.

[Explanation of symbols]

Reference numeral 12: switch, 14: ground fault relay, 16: ground fault characteristic tester, 51: GR check connector, 52: plug connector, 55 to 66: lead wire, 70: contact pin, 7
1: Upper insert, 72: Lower insert, 73, 9
0 ... inner hood, 74, 91 ... outer hood, 76 ... wall surface, 78 ... protrusion, 79 ... groove, 81 ... barrier, 83 ... shrinkable tube as insulating material, 84 ... space, air layer as insulating layer, 96 ... packing, a to j ... female terminals (contact pins), kt ... plug terminals (contact pins).

[Procedure amendment]

[Submission date] March 4, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9

Claims (6)

[Claims] 1. A connector which is connected between a switch and a control device provided at a different place from the switch and has a plurality of terminals including a ground terminal, wherein at least a periphery of the ground terminal of the connector is provided. A connector provided with means for improving the commercial frequency withstand voltage value. 2. The connector according to claim 1, wherein the commercial frequency withstand voltage value improving means has an insulation distance extending structure for extending an insulation distance between a ground terminal and a terminal other than the ground terminal. 3. The connector according to claim 1, wherein the insulation distance extending means is any one of a wall surface, a groove, a barrier, an insulator layer, and a space provided around the ground terminal. 4. The connector according to claim 1, wherein the outside of the connector is molded with rubber or resin, and a sealed structure is provided at the connector connecting portion. 5. The packing structure according to claim 4, wherein said sealing structure is a packing.
A connector as described in. 6. The apparatus according to claim 1, wherein portions other than the current-carrying portion are formed of an insulator.
The connector according to claim 5.