JP2012155922A - Ground tool for electric insulation resistance measurement terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-ground ground tool for an electric insulation resistance measurement terminal capable of reliably inhibiting a drop of a member for connecting a ground side measurement terminal to a cable way side measurement terminal.SOLUTION: A ground tool 1 for an electric insulation resistance measurement terminal is mounted to a pair of measurement terminals for measuring electric insulation resistance. The ground tool comprises a first conductive connection terminal 2 fixed to a ground side measurement terminal 101 among the measurement terminals; a second conductive connection terminal 3, which can be fixed to a cable way side measurement terminal 102 among the measurement terminals and whose outer periphery is covered with an insulation cover 4; and a flexible lead wire 5 provided with the first conductive connection terminal 2 on one end and the second conductive connection terminal 3 on the other end. The second conductive connection terminal 3 is removed from the cable way side measurement terminal 102 during measurement of the electric insulation resistance, and fixed to the cable way side measurement terminal 102 after measuring the electric insulation resistance.

Description

  The present invention relates to a grounding device for an insulation resistance measurement terminal for performing grounding discharge to the earth side after measuring insulation resistance in, for example, an automatic voltage regulator called AVR (Automatic Voltage Regulator) or a control device for a power transmission / distribution system. .

  For electrical equipment in AVR and power transmission / distribution systems, insulation resistance is regularly measured between the circuit and the ground. When measuring insulation resistance by applying a high voltage, safety is ensured. After measuring the insulation resistance, it is necessary to ground the insulation resistance measurement terminal and to discharge the electricity charged on the device under test side to the ground side. This ground discharge is performed, for example, by electrically connecting the ground side terminal and the electric circuit side terminal.

  FIG. 4 shows an example of a conventional insulation resistance measurement terminal. As shown in FIG. 4, the ground side measurement terminal 101 of the insulation measurement terminal 100 includes a base 101a made of an insulator, a conductive portion 101b made of a conductive screw, and an operation made of an insulator. Part 101c. In the insulation measurement terminal 100, the interval between the base 101a and the operation unit 101c is adjusted by rotating the operation unit 101c around the axis. The diameter of the base 101a and the diameter of the operation part 101c are set larger than the diameter d1 of the conductive part 101b. Further, the electric circuit side measurement terminal 102 has the same configuration as the ground side measurement terminal 101.

  Conventionally, in order to connect the ground side measurement terminal 101 to the electric circuit side measurement terminal 102, a plate-like short-circuit piece 200 is used as shown in FIG. This short-circuit piece 200 has a semicircular cut portion 201 that comes into contact with the conductive portion 101c of the ground side measurement terminal 101 at one end, and a cut portion 202 that can come into contact with the conductive portion 102c of the circuit side measurement terminal 102 at the other end. And have. The short-circuit piece 200 is composed of a conductive member except for a portion covered with an insulating portion 203 of an insulator. Such a short-circuit piece 200 is fixed vertically upward by tightening a screw of the ground-side measurement terminal 101 during insulation resistance measurement, and is not in contact with the electric circuit-side measurement terminal 102. After the insulation resistance measurement is completed, the short-circuit piece 200 is tilted toward the electric circuit side measurement terminal 102 by loosening the screw of the earth side measurement terminal 101 so as to come into contact with the conductive portion 102c of the electric circuit side measurement terminal 102. It has become.

  As an example of a technique related to grounding, there is known a grounding device that does not interfere with work even if an operator changes the work position. (For example, refer to Patent Document 1). Further, a technique relating to a connection clip provided with a clip conductor that sandwiches individual terminals to be tested and tested for a control device is known (for example, see Patent Document 2).

Japanese Patent Application Laid-Open No. 10-33090 JP 2009-301818 A

  However, in the ground discharge using the short-circuit piece 200 shown in FIG. 5, it is uncertain whether the short-circuit piece 200 tilts in the A direction or the B direction when the screw of the ground side measurement terminal 101 is loosened. When the short-circuit piece 200 is tilted in an unexpected B direction, the short-circuit piece 200 does not come into contact with the electric circuit side measurement terminal 102 serving as a stopper, so that there is a possibility that the short-circuit piece 200 may fall away from the conductive portion 101c. Since the short-circuit piece 200 has exposed conductive parts at both ends, for example, when the short-circuit piece 200 falls into, for example, a terminal block in the control panel and comes into contact with the current-carrying portion, there is a problem that a ground fault or a short-circuit occurs. . Furthermore, since the short-circuit piece 200 has an insulating portion only in the center, when the short-circuit piece 200 is tilted in the B direction during the grounding operation, the non-insulated portion of the short-circuit piece 200 may touch other members. Careful grounding is required.

  An object of the present invention is to solve the above-mentioned problems, and to reliably prevent a member for connecting the earth side measurement terminal to the electric circuit side measurement terminal from dropping, and to easily perform a grounding operation. It is intended to provide.

  In order to solve the above-mentioned problem, the invention of claim 1 is a grounding tool for an insulation resistance measurement terminal attached to a pair of measurement terminals for measuring an insulation resistance, wherein the ground side measurement terminal of the measurement terminals A first conductive connection terminal fixed to the first conductive connection terminal, a second conductive connection terminal which can be fixed to an electric circuit side measurement terminal among the measurement terminals, and has an outer periphery covered with an insulating cover, and the first conductive connection terminal at one end. A flexible insulated wire provided with a connection terminal and the second conductive connection terminal at the other end, and the second conductive connection terminal is on the electric circuit side when measuring insulation resistance. It is removed from the measurement terminal, and is fixed to the electric circuit side measurement terminal after the insulation resistance measurement.

  According to the present invention, the first conductive connection terminal provided at one end of the flexible insulated wire is fixed to the ground-side measurement terminal, and after measuring the insulation resistance, the outer peripheral portion is the insulating cover. By fixing the covered second conductive connection terminal to the electric circuit side measurement terminal, the ground side measurement terminal is electrically connected to the electric circuit side measurement terminal via the insulated wire.

  According to a second aspect of the present invention, in the grounding device for an insulation resistance measurement terminal according to the first aspect, the second conductive connection terminal is constituted by a hook clip that sandwiches the electric circuit side measurement terminal by a pair of clip members. It is characterized by being.

  According to a third aspect of the present invention, in the grounding instrument for an insulation resistance measurement terminal according to the first or second aspect, the first conductive connection terminal is composed of an existing crimp terminal, and the ground side measurement at the crimp terminal is performed. The annular portion into which the conductive portion of the terminal can be inserted is formed with a cut portion that crosses the outer periphery and the inner periphery. When the conductive portion is inserted into the annular portion, the circumferential length of the cut portion is increased. The length is set to be smaller than the diameter of the conductive portion.

  According to the first aspect of the present invention, the first conductive connection terminal and the second conductive connection terminal are respectively provided at the ends of the flexible insulated wire, and the first conductive connection terminal is connected to the ground side measurement terminal. The second conductive connection terminal whose outer periphery is covered with an insulating cover can be fixed to the electric circuit side measurement terminal, so that the insulated wire for connecting the ground side measurement terminal to the electric circuit side measurement terminal can be dropped. Can be reliably prevented. In addition, since the outer periphery of the insulated wire and the second conductive connection terminal is electrically insulated, it is possible to reliably avoid electrical contact with other members during the grounding operation, and the grounding operation is easy. Become.

  According to the second aspect of the present invention, since the second conductive connection terminal is constituted by the shed clip, the second conductive connection terminal can be more securely gripped, and depending on the skill level of the operator. Therefore, reliable grounding operation is possible.

  According to the third aspect of the present invention, the first conductive connection terminal can be easily manufactured using the existing crimp terminal. In addition, by forming a cutout part in the annular part of the crimp terminal, the cutout part can be deformed so as to be wider than the diameter of the conductive part of the ground side measurement terminal. Therefore, it is possible to fix the crimp terminal to the conductive portion, and it is possible to prevent the insulated wire from dropping from the ground side measurement terminal.

It is a front view of the grounding tool for insulation resistance measurement terminals which concerns on embodiment of this invention. It is a front view which shows the connection state at the time of the insulation resistance measurement of AVR using the grounding tool for insulation resistance measurement terminals of FIG. It is a front view which shows the connection state at the time of earthing | grounding of AVR using the grounding tool for insulation resistance measurement terminals of FIG. It is a side view which shows the insulation resistance measuring terminal of FIG. It is a front view which shows the conventional grounding state of AVR.

  The present invention will be described below based on the illustrated embodiments.

  1 to 4 show a grounding structure using an insulation resistance measuring terminal grounding tool 1 according to an embodiment of the present invention. The insulation resistance measuring terminal grounding tool 1 is used for the grounding operation of the insulation resistance measuring terminal 100. As shown in FIG. 1, the crimping terminal 2 as the first conductive connection terminal and the second conductive connection terminal are mainly used. The cleaver clip 3, the insulating cover 4, and the lead wire 5 as an insulated wire are provided. In this embodiment, the insulation measurement terminal 100 is disposed, for example, in a control panel of an automatic voltage regulator called AVR. As shown in FIG. 2, the ground side measurement terminal 101, the electric circuit side measurement terminal 102, and It has. Further, the conductive portion 101b of the ground side measurement terminal 101 and the conductive portion 102b of the electric circuit side measurement terminal 102 are always exposed to the outside. The measurement of the insulation resistance of the AVR is performed using the conductive portion 101b of the ground side measurement terminal 101 and the conductive portion 102b of the electric circuit side measurement terminal 102. In this embodiment, the AVR is used to automatically adjust the voltage associated with the generator exciter at the power plant.

  As shown in FIGS. 1 and 2, the annular portion 2 a of the crimp terminal 2 is a portion into which the conductive portion 101 b of the ground side measurement terminal 101 of the insulation measurement terminal 100 is inserted, and has a cutout portion 21. The crimp terminal 2 can be deformed by an external force, and can cut and widen the cut portion 21 and can also be narrowed. That is, the annular portion 2a of the crimp terminal 2 can expand the cut portion 21 beyond the diameter of the conductive portion 101b, and the conductive portion 101b is inserted inside the annular portion 2a in this expanded state. It is possible. Specifically, the circumferential length d2 of the cut portion 21 in the annular portion 2a is set to be smaller than the diameter d1 of the conductive portion 101b of the ground side measurement terminal 101. The inner periphery of the annular portion 2a in the crimp terminal 2 is set to be the same as or slightly smaller than the diameter d1 of the conductive portion 101b. For this reason, in the state where the ground side measurement terminal 101 is inserted into the annular portion 2a of the crimp terminal 2, the inner periphery of the annular portion 2a of the crimp terminal 2 and the conductive portion 101b are in close contact with each other, and therefore the crimp terminal 2 is connected. The lead wire 5 does not fall off from the ground side measurement terminal 101 or tilt. In addition, in a state where the crimp terminal 2 is fixed to the ground-side measurement terminal 101, the annular portion 2a of the crimp terminal 2 is brought into close contact with the stepped surface 101d of the conductive portion 101b by the tightening of the operation portion 101c. 101b is surely conducted.

  The shed clip 3 is mainly disposed with a first clip member 31 made of a conductive member and facing the first clip member 31, and is pivotably connected to the first clip member 31. It has the 2nd clip member 32, and the urging means (illustration omitted) which urges | biases the front-end | tip part of the 1st clip member 31 and the front-end | tip part of the 2nd clip member 32 mutually. The mouth clip 3 is configured such that the front end portions are opened apart from each other by pressing the rear end portion of the first clip member 31 and the rear end portion of the second clip member 32 toward each other. Yes. Further, as shown in FIG. 3, the hook clip 3 is configured such that the hook clip 3 and the conductive portion 102 b are electrically connected by sandwiching the conductive portion 102 b of the electric circuit side measurement terminal 102.

  As shown in FIG. 1, the insulating cover 4 is a cover made of an insulator that covers the outer periphery of the shed clip 3 and has an opening 4 a at the tip. In a state where the insulating cover 4 covers the entire shed clip 3, the insulated state of the shed clip 3 is maintained, and as shown in FIG. 3, only when the shed clip 3 is exposed from the opening 4a, The shed clip 3 can conduct by holding the electric circuit side measurement terminal 102. That is, when pinching the electric circuit side measurement terminal 102, the front end portion of the first clip member 31 and the second clip member are in a state where the mouth clip 3 is pulled out and exposed from the opening 4 a of the insulating cover 4. The conductive portion 102b of the electric circuit side measurement terminal 102 is sandwiched between the tip end portions of 32.

  The lead wire 5 is obtained by coating the outer periphery of an assembly of a plurality of strands made of a conductor with an insulating member such as a resin. The lead wire 5 has flexibility, can hold a predetermined posture, and has a function of electrically connecting the crimp terminal 2 and the hook clip 3. For example, as shown in FIG. 2, the lead wire 5 extends in a substantially straight line from the ground side measurement terminal 101 vertically upward so that the mouth clip 3 is positioned vertically above the ground side measurement terminal 101. Holds the shape. Further, when the lead wire 5 is grounded after the insulation resistance measurement, as shown in FIG. 3, the lead wire 5 maintains a curved shape so that the hook clip 3 comes into contact with the electric circuit side measurement terminal 102.

  Next, the usage method and operation of the ground resistance 1 for an insulation resistance measurement terminal having such a configuration will be described.

  The measurement of the insulation resistance of the AVR is performed by removing the shed clip 3 of the grounding tool 1 for the insulation resistance measurement terminal from the electric circuit side measurement terminal 102. Insulation resistance measurement with an insulation resistance measuring instrument (not shown) is performed by bringing the probe (measuring rod) of the insulation resistance measuring instrument into contact with the conductive portion 101b of the ground side measuring terminal 101 and the conductive portion 102b of the electric circuit side measuring terminal 102, This is performed by applying a high voltage between the side measurement terminal 101 and the electric circuit side measurement terminal 102. Then, the ground discharge of AVR after the measurement of the insulation resistance is performed by connecting the opening clip 3 of the grounding tool 1 for the insulation resistance measurement terminal to the electric circuit side measurement terminal 102.

  First, the case where the insulation resistance measuring terminal grounding tool 1 is attached to the AVR insulation measuring terminal 100 will be described. First, a part of the annular portion 2a of the existing crimp terminal 2 is cut by a cutting tool (not shown) to form a cut portion 21 in the annular portion 2a. Next, the crimp terminal 2 is deformed so as to push the cut portion 21 wide, and the circumferential length d2 of the cut portion 21 is made larger than the diameter d1 of the conductive portion 101b. Also, it is confirmed that the screw of the ground side measurement terminal 101 is loosened and the conductive portion 101b is exposed between the base 101a and the operation portion 101c.

  Then, the expanded cut portion 21 is fitted so as to be pushed into the conductive portion 101b, and the conductive portion 101b is inserted inside the annular portion 2a as shown in FIG. The side measurement terminal 101 is inserted. The inner circumference of the crimp terminal 2 is set to be the same as or slightly smaller than the diameter d1 of the conductive portion 101b, and the circumferential length d2 of the cut portion 21 is set to be smaller than the diameter of the ground side measurement terminal 101. At this time, the inner periphery of the crimp terminal 2 and the outer periphery of the conductive portion 101b are in close contact with each other.

  After the crimp terminal 2 is attached to the ground side measurement terminal 101 in this way, the crimp terminal 2 is in close contact with the ground side measurement terminal 101 and is not easily removed, and the screw of the ground side measurement terminal 101 is in a loose state. It will not drop out. That is, the crimp terminal 2 and the ground side measurement terminal 101 are ensured to have high conductivity regardless of the fastening state of the ground side measurement terminal 101.

  The lead wire 5 is disposed so as to extend in a substantially straight line from the ground side measurement terminal 101 in a substantially vertical direction, and the shed clip 3 is held substantially vertically above the ground side measurement terminal 101, and the insulating cover 5. The whole is covered by.

  Next, a case where the insulation measurement terminal 100 is grounded after measuring the insulation resistance of the AVR will be described.

  First, it is confirmed that the screw of the electric circuit side measurement terminal 102 is loosened and the conductive portion 102b is exposed between the base 102a and the operation portion 102c.

  Then, as shown in FIG. 3, the lead wire 5 is bent to expose the distal end portion of the mouth clip 3 from the opening 4 a of the insulating cover 4, so that the conductive portion 102 b of the electric circuit side measurement terminal 102 is held. That is, the electric circuit side measurement terminal 102 is fixed to the mouth clip 3, whereby the electric circuit side measurement terminal 102 is electrically connected to the earth side terminal 101 via the lead wire 5 and the crimp terminal 2, and the ground discharge is started. The

  As described above, after the insulation resistance is measured, the lead wire 5 of the grounding instrument 1 for the insulation resistance measurement terminal is bent to the electric circuit side measurement terminal 102 side, whereby the earth side measurement terminal 101 and the electric circuit side measurement of the insulation measurement terminal 100 are measured. The terminal 102 can be electrically connected via the lead wire 5, and ground discharge from the electric circuit side measurement terminal 102 to the earth side measurement terminal 101 is possible. That is, in the insulation resistance measurement performed by applying a high voltage, electricity is charged on the AVR side by the application of the high voltage, but after the insulation resistance measurement, the earth side measurement terminal 101 and the electric circuit side measurement terminal 102 Are electrically connected via the lead wire 5, so that the electricity charged on the AVR side can be reliably released to the earth side via the earth side measuring terminal 101, and the electricity charged on the AVR side. Can be completely removed.

  When the ground discharge is completed, the mouth clip 3 is removed from the conductive portion 102b, the lead wire 5 is returned to a substantially straight shape, and extends vertically upward from the ground side measurement terminal 101 as shown in FIG. Arranged in a substantially straight line, the shed clip 3 is returned to the state positioned vertically above the ground side measurement terminal 101. In this embodiment, after the ground discharge, the shed clip 3 is detached from the electric circuit side measurement terminal 102, but the shed clip 3 remains fixed to the electric circuit side measurement terminal 102, and the next insulation resistance measurement is performed. At this time, the shed clip 3 may be detached from the electric circuit side measurement terminal 102.

  As described above, according to the invention according to the first embodiment, the crimp terminal 2 and the hook clip 3 are respectively provided at the end of the flexible lead wire 5, and the crimp terminal 2 is connected to the ground side measurement terminal 101. In addition to fixing, the mouth clip 3 whose outer peripheral portion is covered with the insulating cover 4 can be fixed to the electric circuit side measurement terminal 102, so that the lead wire 5 for connecting the earth side measurement terminal 101 to the electric circuit side measurement terminal 102 is provided. The fall can be surely prevented. Moreover, since the outer periphery of the lead wire 5 and the hook clip 3 is electrically insulated, it is possible to reliably avoid electrical contact with other members during the grounding operation, and the grounding operation is facilitated.

  In addition, since the second conductive connection terminal is constituted by the hook clip, the hook clip 3 can be gripped more reliably, and a reliable grounding operation can be performed regardless of the skill level of the operator.

  Furthermore, the crimp terminal 2 can be easily manufactured using an existing crimp terminal. Further, by forming the cut portion 21 in the annular portion 2a of the crimp terminal 2, the cut portion 21 can be deformed so as to be wider than the diameter d1 of the conductive portion 101b of the ground side measurement terminal 101. Without removing the ground side measurement terminal 101, the crimp terminal 2 can be fixed to the conductive portion 101b, and the lead wire 5 can be prevented from falling off from the ground side measurement terminal 101. In addition, the insulation resistance measurement terminal grounding device 1 can be used without changing or operating the existing insulation measurement terminal 100.

  In addition, since the lead wire 5 is made of a material that is flexible and can maintain a predetermined posture, the ground discharge as described above can be repeatedly performed. Furthermore, the lead wire 5 is disposed so as to extend vertically upward except during the ground discharge, and unless the external force is applied and the lead clip 5 is bent in a predetermined direction, the shed clip 3 does not contact the electric circuit side measurement terminal 102. That is, even if the electric circuit side measurement terminal 102 is always loosened (the conductive portion 102b is always exposed), the shed clip 3 will not be inadvertently contacted. In this way, the grounding terminal for the insulation resistance measurement terminal does not drop or ground discharge unless an external force is applied, regardless of the fastening state of the ground side measurement terminal 101 and the electric circuit side measurement terminal 102. The ground-side measurement terminal 101 and the electric circuit-side measurement terminal 102 can always be loosened. That is, at the time of ground discharge, it is only necessary to hold the electric circuit side measurement terminal 102 with the shed clip 3 without operating the earth side measurement terminal 101 and the electric circuit side measurement terminal 102. This improves operability.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the contact portion has been described as a lip clip, but may be formed of another conductive member such as a rod-shaped test probe. In this case, the ground discharge can be performed by bringing the rod-shaped test probe into contact with the conductive portion 102b of the electric circuit side measurement terminal 102 after measuring the insulation resistance.

  Further, in a state where the crimp terminal 2 is inserted into the ground side measurement terminal 101, the crimp terminal 2 is pressed so as to return to its original state by turning the operation portion 101 c of the ground terminal 101 and fastening the screw. You may make it make it.

1 Insulation resistance measurement terminal grounding tool 2 Crimp terminal (first conductive connection terminal)
3 Hook clip (second conductive connection terminal)
4 Insulation cover 5 Lead wire (insulated wire)
21 Cutout portion 31 First clip member 32 Second clip member 100 Insulation resistance measurement terminal 101 Ground side measurement terminal 102 Electric circuit side measurement terminal

Claims (3)

An insulation resistance measurement terminal grounding device attached to a pair of measurement terminals for measuring insulation resistance,
A first conductive connection terminal fixed to the ground side measurement terminal among the measurement terminals;
A second conductive connection terminal that can be fixed to an electric circuit side measurement terminal among the measurement terminals and whose outer periphery is covered with an insulating cover;
A flexible insulated wire in which the first conductive connection terminal is provided at one end and the second conductive connection terminal is provided in the other end;
With
The second conductive connection terminal is removed from the electric circuit side measurement terminal when measuring the insulation resistance, and is fixed to the electric circuit side measurement terminal after measuring the insulation resistance. Ingredients.   2. The grounding device for an insulation resistance measurement terminal according to claim 1, wherein the second conductive connection terminal is constituted by a hook clip that sandwiches the electric circuit side measurement terminal by a pair of clip members. The first conductive connection terminal is composed of an existing crimp terminal, and an annular part into which the conductive part of the ground side measurement terminal in the crimp terminal can be inserted has an excision part that crosses the outer periphery and the inner periphery. 2. The length of the cut portion in the circumferential direction is set to be smaller than the diameter of the conductive portion when the conductive portion is formed and inserted into the annular portion. Or the earthing | grounding tool for insulation resistance measurement terminals of 2.

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