JP2008008659A - Voltage detector for instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voltage detector which simply detects voltage in a short period of time as well as performs a Megger inspection without checking on a drawing, confirms the voltage with a tester while holding the voltage detector, and prevents DC grounding by mistaking the test range. <P>SOLUTION: The voltage detector is provided with a moveable probe 14 in a holder 3 of a voltage detecting part 4. When a movable contact 13 of the movable probe 14 is apart from the contact for a Megger 10 of an insulation resistance meter 7 of a Megger measurement meter 1, while being in contact with a contact 12 for voltage detector, it is utilized for detection the voltage. When no voltage is confirmed, the movable probe 14 is pushed in together with the movable contact 13 against an elastic member 11, the Megger measurement is performed with the insulation resistance meter 7 by making the movable contact 13 brought into contact with the contact 10 for Megger. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a voltage detection device for a measuring instrument that measures insulation resistance in a wiring facility such as a power line or a communication line laid in a power plant, factory, plant facility, or the like.

  Conventionally, insulation resistance measurement, so-called megger measurement, has been carried out as a major inspection item for low-voltage circuits. In this measurement, even if the inspection equipment is stopped, a circuit with voltage always remains due to connection from another device. Therefore, at present, the presence or absence of voltage is confirmed with a tester and recorded, and then the megger is measured with an insulation resistance measuring instrument.

  For example, it was time-consuming because the tester confirmed that there was no voltage, recorded that fact, and then performed the measurement work according to the procedure of megger measurement. There is a high possibility that the terminal block is mistaken in the middle of such a measurement step. There is a risk of mistakes in equipment other than inspection points. For this purpose, two measuring instruments and recording paper are required, and it takes time and labor for the measurement work alone.

Therefore, a technique for efficiently measuring the conduction state and insulation state of wiring equipment such as cables has been proposed. For example, as shown in Japanese Patent Application Laid-Open No. 10-170571 “Measurement state of wiring facility and insulation resistance” of Patent Document 1, a tester for measuring a resistance value of a closed circuit formed by a wiring path, A megger for measuring an insulation resistance value in a high voltage application state, a tester side connection terminal to which a pair of measurement terminals provided in the tester is connected, and provided in the megger A megger side connection terminal to which a pair of measurement terminals are connected, a first and second wiring path side connection terminals for connection to a pair of measured wiring paths, and a ground side connection terminal for connection to the ground. The connection unit is configured to selectively connect the tester side connection terminal or the megar side connection terminal to the first and second wiring path side connection terminals. The first and second wiring path side connection terminals and the ground in the state where the changeover switch is connected between the changeover switch and the megger side connection terminal and the changeover switch selects the megger side connection terminal. A wiring equipment conduction state and insulation resistance measuring device is proposed, comprising a switching circuit that constitutes a circuit network for measuring an insulation resistance value between any two terminals of the side connection terminals. Yes.
JP-A-10-170571

Further, as shown in Japanese Utility Model Publication No. 7-20612 of Japanese Patent Application Laid-Open No. 7-20612, a probe attached to the tip of a cylindrical case and a ground terminal member attached to the rear end of the cylindrical case A first LED lamp connected in series in the forward direction between the probe and the ground terminal member inside the cylindrical case, and the probe and the ground member inside the cylindrical case. A second LED lamp having a different emission color from the first LED lamp connected in series in the opposite direction between the probe and the rectifier provided between the probe and the ground member inside the cylindrical case There has been proposed a DC voltage detection tester characterized by having a DC voltage drive type sounding means to which the rectified voltage is applied.
No. 7-20612

  However, although the “insulation resistance measuring device” of Patent Document 1 can switch between an insulation resistance measuring instrument and a tester, it is necessary to carry the switching instrument and two measuring instruments for the measurement. Therefore, the insulation resistance measuring device of Patent Document 1 has a problem that it does not save labor in the work procedure and simplify the work.

  In addition, in the “tester” of Patent Document 2, measurement as a tester can be easily performed, but in order to perform a megger measurement at a location where there is no voltage, it is necessary to confirm the measurement location with a drawing or the like, There was a problem that the inspection took time.

  The present invention has been developed to solve such problems. In other words, the object of the present invention is to check the presence or absence of voltage with a tester while holding the voltage detection device, so that megger measurement can be performed at a place where there is no voltage without confirming with the drawing, and due to a mistake in the test range. An object of the present invention is to provide a voltage detection device for a measuring instrument that can prevent a DC ground fault and can be easily checked in a short time by anyone.

  According to the present invention, the Megar probe (2) attached to the measurement main body (6), the insulation ohmmeter (7) connected to the measurement main body (6), and the insulation ohmmeter (7) And a grounding terminal (8) attached to the tube, and a voltage detecting device for the megger measuring device (1), the cylindrical holder (3) configured to be plugged into the megger probe (2), The megger contact (10) of the insulation resistance meter (7) of the megger measuring device (1) provided in the cylindrical holder (3) and the megger contact (10) by the elastic member (11) Electricity detection comprising a movable probe (14) provided with a movable contact (13) movably disposed in the cylindrical holder (3) so as to be always away from and in contact with the voltage detection contact (12). When the part (4) and the movable probe (14) are brought into contact with the measurement object (16) at the time of measurement, and there is voltage And when the movable probe (14) is brought into contact with the measurement object (16) and it is confirmed by the alarm unit (5) that there is no voltage, the movable contact (14) is provided. The movable probe (14) is pushed against the elastic member (11) together with (13), and the movable contact (13) comes into contact with the mega contact (10) so that the insulation resistance meter (7) functions. A voltage detecting device for a measuring instrument configured as described above is provided.

The cylindrical holder (3) can be configured to be detachably inserted into the mega probe (2).
In order to maintain the state in which the movable contact (13) is in contact with the mega contact (10), a stopper (18) is provided for latching the movable contact (13) on the cylindrical holder (3). Is preferred.
When the movable probe (14) is brought into contact with the object to be measured (16), the alarm unit (5) is lit by the presence or absence of a plus or minus voltage, and the LED (5) that is not lit when there is no voltage. Can be used.
Alternatively, the alarm unit (5) has a buzzer that rings when the movable probe (14) is brought into contact with the measurement object (16), and whether or not there is a plus or minus voltage, and does not ring when there is no voltage. Can be used.
For the alarm section (5), a vibrating body that vibrates depending on the presence or absence of a plus or minus voltage when the movable probe (14) is brought into contact with the measurement object (16) and does not vibrate when there is no voltage is used. be able to.

In the invention having the above-described configuration, the movable probe (14) provided in the cylindrical holder (3) of the voltage detector (4) has a movable contact (13) whose insulation resistance meter (7) of the Megger measuring instrument (1). ) Is away from the mega contact (10) and is in contact with the voltage detection contact (12), it can be used for measuring the presence or absence of voltage. Therefore, the movable probe (14) is brought into contact with the measurement object (16), and when there is a plus or minus voltage, the alarm unit (LED (5)) is turned on to confirm that the megger measurement cannot be performed. it can.
On the other hand, when the alarm unit (LED (5)) of the voltage detection unit (4) is not lit, it can be determined that there is no voltage and that the megger measurement can be performed. Therefore, the movable probe (14) is pushed against the elastic member (11) together with the movable contact (13), and the movable contact (13) is brought into contact with the mega contact (10). Megger can be measured.

  As described above, since both the electric detection and the megger measurement can be performed with one measuring instrument, it is possible to prevent a DC ground fault due to a mistake in the range during the measurement and to avoid a failure of the apparatus. Moreover, since it is not necessary to confirm a measurement location with a drawing as in the prior art, and a megger measurement can be performed at a location where there is no voltage, anyone can inspect it easily and in a short time.

  The voltage detector for the measuring instrument of the present invention is provided with a movable probe in the cylindrical holder of the voltage detector, and the movable contact is separated from the contact for the megger of the insulation resistance meter of the megger measuring instrument. Can be used when measuring the presence or absence of voltage. On the other hand, when it can be confirmed that there is no voltage, the movable probe is pushed against the elastic member together with the movable contact, and the movable contact is brought into contact with the contact for the megger and megger measurement can be performed with an insulation resistance meter It is.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a partial cross section of a voltage detection device for a measuring instrument according to a first embodiment. FIG. 2 is a detection circuit diagram of the voltage detection device.
The voltage detector for the measuring instrument according to the present invention inserts the cylindrical holder 3 into the mega probe 2 provided in the megger measuring instrument 1 for measuring the insulation resistance, and confirms the presence or absence of voltage in the cylindrical holder 3. And a warning unit 5 that issues a warning when voltage is present.

  The megger measuring instrument 1 has a substantially cylindrical measuring main body 6 that can be grasped by a hand, a megger probe 2 attached to one end thereof, and an insulation resistance meter 7 connected to the measuring main body 6. A ground terminal (grounding clip) 8 is connected to the insulation resistance meter 7. The megger measuring instrument 1 measures insulation resistance in a wiring facility such as a power line or a communication line. A fuse 9 is connected between the insulation resistance meter 7 and the ground terminal portion 8.

  The cylindrical holder 3 is configured to be inserted into the mega probe 2 of the mega measuring instrument 1. This cylindrical holder 3 is configured so as to be detachably inserted into the mega probe 2 or by screwing. For example, the part into which the mega probe 2 on one side of the cylindrical holder 3 is inserted is formed to be as thin as the outer diameter of the mega probe 2. Further, the other side of the cylindrical holder 3 has a thick space so that a movable probe 14 that functions as a later-described voltage detection unit 4 and the elastic member 11 can be accommodated.

  The movable probe 14 is inserted into the cylindrical holder 3 so as to be movable back and forth. A movable contact 13 is provided on the distal end side (right side in the illustrated example of FIG. 1) of the movable probe 14, and a pressing plate 15 is fixed to the opposite side of the movable contact 13. The pressing plate 15 is a coil spring 11 and is always pressed rightward in the illustrated example. The movable contact 13 and the pressing plate 15 are fixed so that a disk-shaped member penetrates the movable probe 14.

  The voltage detection unit 4 is always separated from the mega contact 10 of the insulation resistance meter 7 of the megger measuring instrument 1 by the elastic member 11 such as a coil spring in the cylindrical holder 3 and contacts the voltage detection contact 12. A movable probe 14 provided with a movable contact 13 is inserted into the. As shown in the figure, the mega contact 10 is formed of a cylindrical part having a hole in the center, and a contact is formed at one end thereof.

  Similarly, in the cylindrical holder 3, a voltage detection contact 12 is provided outside the mega contact 10 (on the right side in the illustrated example of FIG. 1). In the illustration of FIG. 1, the movable contact 13 of the movable probe 14 is in contact with the detection contact 12. The movable probe 14 can be easily moved back and forth in the cylindrical holder 3, and the movable contact 13 provided on the movable probe 14 can be separated from or connected to the contact for mega 10 or the contact for detection 12. it can.

  The alarm unit 5 is brought into contact when the movable probe 14 is brought into contact with the measurement object 16 during measurement and voltage is present. For example, as shown in the figure, an LED 5 is provided that lights up when the movable probe 14 is brought into contact with the measurement object 16, and whether or not plus or minus voltage is present and does not light up when there is no voltage. This LED 5 can also be configured to be a different color or blink to facilitate the operator's attention. For example, when a negative DC voltage is detected, the LED 5 having a different emission color can emit light to detect a negative DC voltage. A resistor 17 is connected to the LED 5.

  Alternatively, the alarm unit 5 turns into a buzzer (not shown) that rings when the movable probe 14 is brought into contact with the measurement object 16 according to the presence or absence of a plus or minus voltage and does not ring when there is no voltage. be able to. For example, it is convenient when it is difficult to check the light emission state of the alarm unit 5 (LED) when the measurement object is in a place where it is difficult for an operator to see or in a recess. Furthermore, it becomes easier for an operator to confirm by using this buzzer and LED5 together. Alternatively, the alarm unit 5 can include a vibrating body (not shown) instead of the LED 5 or the buzzer. In addition, the embodiment is not limited to these examples as long as the worker can recognize the alarm state.

FIG. 3 is a cross-sectional view showing the operating state of the movable probe and the movable contact, (a) is a state before the movable probe is brought into contact with the measurement object, (b) is a voltage, and the LED is lit. (C) is a state in which there is no voltage and the LED is not lit, and (d) is a state in which the movable probe is pushed in and the megger is measured.
In the voltage detection device for the measuring instrument of the present invention configured as described above, the movable contact 13 is separated from the mega contact 10 of the insulation resistance meter 7 of the megger measuring instrument 1 as shown in the figure, Since it is in contact, the presence or absence of a voltage can be measured (FIG. 3A). When the movable probe 14 is brought into contact with the measurement object 16, the alarm unit (LED 5) is turned on depending on the presence or absence of positive and negative voltages (FIG. 3B). Or the alarm unit (buzzer) sounds.

  On the other hand, when there is no voltage, the movable probe 14 is not lit even if it is brought into contact with the measurement object 16 (FIG. 3C). Or the alarm unit (buzzer) does not sound. Therefore, after confirming that there is no voltage, the movable probe 14 is pushed together with the movable contact 13 against the elastic member 11, the movable contact 13 is brought into contact with the contact for megger 10, and megger measurement is performed with the insulation resistance meter 7. (FIG. 3D).

  For example, when inspecting the conduction state and the insulation state of the measuring object 16 using the voltage detection device for the measuring instrument of the present invention, the following procedure is used. A measuring switch (not shown) provided on the measuring body 6 is placed while the movable contact 13 in contact with the megger contact 10 of the megger measuring instrument 1 is applied to the measuring object 16 to be measured. Push. The instruction value by the mega at this time, that is, the insulation resistance value is quantitatively read by the insulation resistance meter 7, and the measured value is recorded as the insulation resistance value between the ground. Subsequently, the grounding clip 8 of the ground terminal portion is removed, and this time, the grounding clip 8 is reconnected to the measurement object 16 while the movable contact 13 is applied to the measurement object 16 to be measured while being measured. The measurement switch provided on the main body 6 is pressed again. The instruction value by the mega at this time, that is, the insulation resistance value is quantitatively read by the insulation resistance meter 7, and the measured value is recorded as the insulation resistance value between the lines. The inspection of the conduction state and the insulation state of the measurement object 16 is completed by such a series of operations.

FIG. 4 is a configuration diagram showing a partial cross section of a voltage detector for a measuring instrument provided with a stopper according to the second embodiment. FIG. 4A shows a state where the stopper is free and the movable probe contacts the voltage detection contact. (B) shows a state in which the movable contact is stopped by the stopper so that the movable probe contacts the contact for the mega.
The voltage detection device for the measuring instrument of Example 2 is provided with a stopper 18 that holds the movable contact 13 on the cylindrical holder 3. This is because the movable contact 13 is always pushed to the detection contact 12 side by the elastic member 11. The state of being in contact with the megger contact 10 cannot be maintained. However, it is troublesome for the measuring instrument of the present invention to perform the operation of pushing the movable probe 14 for every megger measurement. Therefore, when performing only the megger measurement, a stopper 18 is provided to omit the pushing operation of the movable probe 14.

  The stopper 18 is provided with a claw 19 for hooking the pressing plate 15 of the movable probe 14 at the tip of the rod-shaped member, and the middle of the rod-shaped member is swingably attached to the cylindrical holder 3 and is attached to the rear end of the rod-shaped member. A spring 20 is attached to bias the claw 19 so that it always faces the cylindrical holder 3 side. The claw 19 has an inclined surface so that the pressing plate 15 moving from the distal end direction of the stopper 18 can easily get over. However, when the pressing plate 15 gets over the claw 19, it does not come off the claw 19. When removing the pressing plate 15 from the stopper 18, the rear end of the stopper 18 is pressed to separate the claw 19 from the pressing plate 15. The stopper 18 is not limited to the structure shown in the drawing as long as the stopper 18 can be engaged with the movable contact 14 and the movable contact 13 that is in contact with the mega contact 10.

  In the present invention, by checking the presence or absence of a voltage with a tester while holding the voltage detection device, it is possible to perform a megger measurement at a place where there is no voltage without confirming with a drawing, and a DC ground due to an incorrect test range. Of course, any structure can be used as long as anyone can easily check in a short time while preventing entanglement, and various modifications can be made without departing from the scope of the present invention. is there.

  The voltage detector for the measuring instrument of the present invention can be used for measuring the conduction state and the insulation state of each line in a wiring facility such as a communication line or a power line installed in a factory or plant facility.

It is the whole block diagram made into the partial cross section of the voltage detection apparatus for the measuring device of Example 1. FIG. It is a detection circuit diagram of a voltage detection apparatus. It is sectional drawing which shows the operation state of a movable probe and a movable contact, (a) is a state before making a movable probe contact with a measuring object, (b) is a state where there is voltage and LED is lit. (C) is a state in which there is no voltage and the LED is not lit, and (d) is a state in which the movable probe is pushed in and the megger is measured. It is the block diagram which made the partial cross section of the voltage detection apparatus for the measuring instrument which provided the stopper of Example 2, (a) is a state in which the stopper is free and the movable probe is in contact with the voltage detection contact; (B) is a state in which the movable contact is stopped by the stopper so that the movable probe contacts the contact for the megar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Megger measuring device 2 Megger probe 3 Cylindrical holder 4 Electric detection part 5 Alarm part (LED)
6 Main body for measurement 7 Insulation resistance meter 8 Ground terminal (grounding clip)
10 Megger contacts 11 Elastic member (coil spring)
12 Contact for Voltage Detection 13 Movable Contact 14 Movable Probe 16 Measurement Object 18 Stopper

Claims (6)

A megger probe (2) attached to the main body for measurement (6), an insulation resistance meter (7) connected to the main body for measurement (6), and a ground terminal portion attached to the insulation resistance meter (7) (8) and a voltage measuring device for the megger measuring device (1),
A cylindrical holder (3) configured to be plugged into the megger probe (2);
The megger contact (10) of the insulation resistance meter (7) of the megger measuring device (1) provided in the cylindrical holder (3) and the megger contact (10) are always provided by the elastic member (11). And a movable probe (14) provided with a movable contact (13) movably disposed in the cylindrical holder (3) so as to be in contact with the contact for voltage detection (12). (4) and
The movable probe (14) is brought into contact with the measurement object (16) at the time of measurement, and an alarm unit (5) that emits a voltage when it is present,
When the movable probe (14) is brought into contact with the measurement object (16) and it is confirmed by the alarm unit (5) that there is no voltage, the movable probe (14) is moved together with the movable contact (13). A measuring instrument characterized in that it is pushed against the elastic member (11) and the movable contact (13) comes into contact with the mega contact (10) so that the insulation resistance meter (7) functions. Voltage detection device for. The voltage detection device for a measuring instrument according to claim 1, wherein the cylindrical holder (3) is configured to be detachably inserted into the mega probe (2). In order to maintain the state where the movable contact (13) is in contact with the mega contact (10), a stopper (18) is provided for latching the movable contact (13) on the cylindrical holder (3). The voltage detection device for the measuring instrument according to claim 1 or 2, characterized by the above-mentioned. When the movable probe (14) is brought into contact with the measurement object (16), the alarm unit (5) is turned on by the presence or absence of a plus or minus voltage, and is not turned on when there is no voltage. The voltage detecting device for a measuring instrument according to claim 1, wherein The alarm unit (5) is a buzzer that rings when there is a plus or minus voltage when the movable probe (14) is brought into contact with the measurement object (16) and does not ring when there is no voltage. The voltage detection device for a measuring instrument according to claim 1. The alarm unit (5) is a vibrating body that vibrates depending on the presence or absence of a plus or minus voltage when the movable probe (14) is brought into contact with the measurement object (16), and does not vibrate when there is no voltage. The voltage detection device for a measuring instrument according to claim 1.

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