JP5335008B2 - Trip lock terminal voltmeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a voltage measuring instrument for a trip lock terminal, which is capable of easily and efficiently measuring a voltage between the trip lock terminal and an earth terminal for testing. <P>SOLUTION: The voltage measuring instrument includes a voltmeter 22 for displaying a measured voltage, a body part 12 housing the voltmeter 22, and a pair of contacts 18a and 18b which are provided at an interval corresponding to an inter-terminal distance between a pair of trip lock terminals 30a and 30b and are brought into contact with the pair of trip lock terminals 30a and 30b respectively. Either of the pair of contacts 18a and 18b and one electrode of the voltmeter are selectively connected by a switch 34, and the other electrode of the voltmeter 22 is connected to an earth terminal for testing. By this configuration, voltages of both of trip lock terminals 30a and 30b can be measured by only operating the switch 34, with the pair of contacts 18a and 18b in contact with the pair of trip lock terminals 30a and 30b. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a voltmeter for a trip lock terminal, and more particularly to a trip lock terminal for measuring the voltage of a trip lock terminal for confirming the soundness of a protective device after tripping a circuit breaker and completing a predetermined work. Related to voltmeters.

  A circuit including a protection device 40 and a circuit breaker 28 as shown in FIG. 5 is employed as a power protection circuit for a power generation substation or the like. The protection device 40 is accommodated in the power protection control panel 26 and has a function of controlling the circuit breaker 28 to protect the transformer and the power transmission line. The power protection control panel 26 is provided with a test ground terminal 32. When the circuit breaker 28 is trip-locked for work or the like, it is performed by removing a short-circuit piece (not shown) attached to the trip-lock terminals 30a and 30b. The trip lock terminals 30a and 30b are mounted on the power protection control panel 26, and a part of the metal electrode is exposed so that the voltage of the terminal can be measured from the outside.

  After the trip lock is performed and the predetermined work is finished, the short-circuit piece is attached to the trip lock terminals 30a and 30b, but before that, it is necessary to check the soundness of the protection device 40. The soundness is confirmed by measuring the voltages at the trip lock terminals 30a and 30b and the test ground terminal 32. This voltage measurement is performed by connecting a voltmeter between the trip lock terminals 30 a and 30 b and the test ground terminal 32. If the voltage between the trip lock terminal 30b on the circuit breaker 28 side and the test ground terminal 32 is -55V and the voltage between the trip lock terminal 30a on the protective device 40 side and the test ground terminal 32 is 0V, the sound is healthy. It is judged that. In addition, when the short-circuit piece is attached to the trip lock terminals 30a and 30b in an unhealthy state, a current flows through the trip coil 28a, causing the circuit breaker 28 to malfunction and causing a problem such as a power failure.

  The trip lock terminals 30a and 30b are usually round studs to which a short-circuit piece or the like can be easily connected. In order to measure the voltage, the tip of the lead wire of the voltmeter is brought into contact with the exposed metal part of the terminal. To be done. Therefore, the operator performs measurement by holding the voltmeter main body and the lead wire tip. In general, the tip of the lead wire is made of metal and has a sharp needle shape.

  Patent Document 1 discloses a voltmeter for measuring a trip lock terminal. A contact plug is attached to the voltmeter so that the voltage between the terminals can be measured with respect to the stud type trip lock terminal. The contact plug is provided with contacts at intervals equal to the terminal interval of the trip lock terminal, lead wires are connected to the respective contact members, and a banana terminal is connected to the tip of each lead wire. These banana terminals are inserted into the terminals of a voltmeter, and the above-mentioned contact is brought into contact with the trip lock terminal so that the voltage can be measured.

JP-A-10-160762

  When measuring voltage, it is necessary to have a voltmeter body and two lead wires, one of which is applied to the test ground terminal and the other to either of the trip lock terminals. is there. When measurement of either one of the pair of trip lock terminals is completed, measurement of the other trip lock terminal is performed in the same manner. Here, since the tip end portion of the lead wire has a needle-like shape made of metal, the contact with the metal portion of the trip lock terminal becomes a point contact and may slip off at the time of contact. In addition, since there are many trip lock terminals to be measured, it has a voltmeter body and two lead wires. One of the two lead wires is applied to the test ground terminal, and the other is the metal part of the trip lock terminal. The operation of measuring the voltage against the above is complicated and takes a long time.

  Further, the voltmeter for measuring the trip lock terminal disclosed in Patent Document 1 is configured such that the disclosed contact plug cannot measure voltage between the trip lock terminal and the test ground terminal. In addition, if a contact lead having a metallic point is connected to the tip of a normal lead wire without using a contact plug, the same problem as described above will occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a trip lock terminal voltage measuring device capable of easily and efficiently measuring a voltage between a trip lock terminal and a test ground terminal. There is.

In order to achieve the above object, a voltage measuring instrument for a trip lock terminal according to claim 1 includes a pair of trip lock terminals provided on the power protection control panel at a predetermined interval, and the power protection control panel. A voltage measuring instrument for a trip lock terminal that measures a voltage between a ground terminal for testing provided in a voltmeter, a voltmeter that displays the measured voltage, a main body that houses the voltmeter, and the pair of trips A pair of contacts provided at intervals corresponding to the distance between the terminals of the lock terminals and abutting against the pair of trip lock terminals, respectively, wherein one electrode of the voltmeter is the pair of contacts is connected either with selected by the switching of the other electrode of the voltmeter is connected to said test ground terminal, said pair of contactors, mounting position can be changed relative to the body portion Voltage measuring device for trip locking pin, characterized in that provided in the child boxes.

  With this configuration, the voltage between the trip lock terminal and the test ground terminal is measured only by bringing the pair of contacts into contact with the pair of trip lock terminals. That is, by selecting and connecting one electrode of the voltmeter and one of the pair of trip lock terminals by switching, the voltage of the pair of trip lock terminals can be trip-locked with any terminal. It can be measured in a state where it is in contact with the terminal. More specifically, once the contact is brought into contact with the trip lock terminal, the voltage of one of the pair of trip lock terminals is measured in that state. And the voltage of the other terminal of a pair of trip lock terminals can also be measured only by switching a connection by switching. Therefore, the voltage between the pair of trip lock terminals and the test ground terminal can be measured easily and efficiently.

Furthermore, since the pair of contacts are provided in a terminal box whose mounting position can be changed with respect to the main body portion, it is difficult to place the contacts in contact with the trip lock terminal. It is possible to make the contact of the contact with the trip lock terminal easy by changing the mounting position of the contact to the main body. That is, voltage measurement can be performed easily and efficiently regardless of how the pair of trip lock terminals are attached to the power protection control panel.

The voltage measuring instrument for trip lock terminals according to claim 2 is the voltage measuring instrument for trip lock terminals according to claim 1,
Each of the pair of contacts is formed with a substantially arc-shaped concave portion whose tip end matches the shape of the terminal shaft of the trip lock terminal. Therefore, when the contact is brought into contact with the trip lock terminal, electrical contact with the trip lock terminal can be ensured, and displacement of the contact can be prevented in the horizontal or vertical direction.

The voltage measuring instrument for trip lock terminals according to claim 3 is the voltage measuring instrument for trip lock terminals according to any one of claims 1 or 2 ,
The main body includes a display unit that indicates whether one electrode of the voltmeter is connected to one of the pair of contacts. Therefore, it is clear which contact the measurement value is for, and it is possible to prevent erroneous determination.

  According to the voltage measuring instrument for trip lock terminals of the present invention, the voltage of both of the pair of trip lock terminals can be obtained simply by abutting the pair of contacts with the pair of trip lock terminals and switching the connection with the voltmeter by switching. Therefore, it is possible to efficiently check the soundness of the protective device. Therefore, the confirmation work time can be shortened and the cost can be reduced. Furthermore, since the confirmation work can be performed easily, the risk of misjudgment of the soundness of the protective device is reduced.

It is a schematic perspective view of the voltage measuring device for trip lock terminals of the present invention. It is explanatory drawing which measures a trip lock terminal using the voltage measuring device for trip lock terminals of FIG. It is a schematic perspective view which shows the example which was related with the voltage measuring device for trip lock terminals of FIG. 1, and was able to change the attachment position to the main-body part of a terminal box. It is a circuit block diagram which shows other embodiment of the voltage measuring device for trip lock terminals of this invention. It is a circuit block diagram which shows an example of electric power protection control circuits, such as a power generation substation.

  Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic perspective view of a voltage measuring device for trip lock terminals according to an embodiment of the present invention. FIG. 2 is an explanatory diagram for measuring the trip lock terminal using the trip lock terminal voltage measuring device of FIG. 1, and also shows an internal wiring diagram of the trip lock terminal voltage device. The trip lock terminal voltage measuring instrument 10 includes a main body 12 that houses a voltmeter 22 and a terminal box 16 that houses a pair of contacts 18a and 18b. Hereinafter, each component will be described in detail.

  The main body 12 includes a switch 34 having a voltmeter 22 and a push button 24 in a substantially rectangular housing. The voltmeter 22 displays the measured DC voltage between the terminals. In this embodiment, the voltmeter 22 is of an analog type, that is, a type in which a needle rotates. The center is 0 V so that positive and negative DC voltages can be measured. The voltmeter 22 has two electrodes, and one electrode 23a is connected to one of the pair of trip lock terminals 30a and 30b. The other electrode 23 b is connected to the test ground terminal 32 of the power protection control panel 26.

  One electrode 23 a of the voltmeter 22 is connected to one of the trip lock terminals 30 a and 30 b by a switch 34. That is, the switch 34 switches the connection between one electrode of the voltmeter 22 and one of the pair of trip lock terminals 30a and 30b. The switch 34 has three terminals T1, T2, and T3 (see FIG. 2), and the terminal T1 connected to one electrode 23a of the voltmeter 22 is selectively connected to either the terminal T2 or the terminal T3. The Terminal T2 is connected to trip lock terminal 30b, and terminal T3 is connected to trip lock terminal 30a. This connection is selected by the push button 24. In the present embodiment, the push button 24 is biased by a spring (not shown), and the terminal T1 is normally connected to the terminal T2. When the button 24 is pushed against the biasing force of the spring, the terminal T1 is connected to the terminal T3. Further, the connection between the other electrode 23 b of the voltmeter 22 and the test ground terminal 32 is performed by taking out the lead wire 36 from the main body 12. A banana clip 36 a is attached to the tip of the lead wire 32. Therefore, by clipping the banana clip 36 a to the test ground terminal 32, the other electrode 23 b of the voltmeter 22 and the test ground terminal 32 are electrically connected.

  A terminal box 16 is attached to an upper portion of the substantially rectangular parallelepiped body portion 12. The terminal box 16 has a substantially rectangular parallelepiped shape smaller than the main body 12, and one of the six surfaces serves as a mounting surface for the main body 12, and a pair of contacts 18 a and 18 b are formed on a surface perpendicular to the one surface. Protrusively formed. The distance between the pair of contacts 18a, 18b is substantially equal to the distance between the pair of trip lock terminals 30a, 30b. The pair of contacts 18a, 18b are made of metal, and substantially arc-shaped recesses 24a, 24b are formed at the projecting ends. Therefore, when the pair of contacts 18a and 18b are brought into contact with the trip lock terminals 30a and 30b, it is possible to prevent reliable electrical contact and lateral displacement.

  A grip portion 14 is attached to a surface of the main body portion 12 that faces the surface to which the terminal box 16 is attached. The gripping portion 14 has a rod-like body shape and is formed so as to be easily gripped by hand. This gripping part 14 makes it easy to bring the pair of contacts 18a, 18b into contact with the pair of trip lock terminals 30a, 30b. The grip 14 may be provided on any surface of the main body 12, and the shape can be arbitrarily determined regardless of the shape of the rod.

  FIG. 2 is a schematic explanatory diagram of voltage measurement using the trip lock terminal voltage measuring device shown in FIG. In FIG. 2, as described with reference to FIG. 4 of the background art, the protection device 40 is accommodated in the power protection control panel 26, and the protection device 40 and the trip lock terminal 30a are connected. The trip lock terminal 30b is connected to the trip coil 28a of the disconnector 28.

  In the method of using the trip lock terminal voltage measuring instrument 10 of the present embodiment, first, the banana clip 36 a is connected to the test ground terminal 32 of the power protection control panel 26. Next, the pair of contacts 18a and 18b are brought into contact with the pair of trip lock terminals 30a and 30b with the grip portion 14. Since the distance between the pair of contacts 18a and 18b and the pair of trip lock terminals 30a and 30b is substantially the same, the contact can be easily made. Furthermore, since the concave portions 20a and 20b are formed at the tip portions of the contacts 30a and 30b, a lateral shift or the like does not occur once contacted, and stable contact can be maintained.

  Since the push button 24 is normally connected to the terminal T1 and the terminal T2 as described above, the contact 18a, 18b of the trip lock terminal voltage measuring instrument 10 is brought into contact with the trip lock terminals 30a, 30b. The voltage between the trip lock terminal 30b on the circuit breaker 28 side and the test ground terminal 32 is measured. Next, by pushing the push button 24, the terminals T1 and T3 are connected, and the voltage between the trip lock terminal 30a on the protective device 40 side and the test ground terminal 32 is measured. If there is no abnormality in the above measured value, the next trip lock terminal measurement can be started. As described above, by using the trip lock terminal voltage measuring instrument 10 of the present embodiment, it is possible to easily and efficiently perform the work of measuring the voltage of the trip lock terminal.

  FIG. 3 is a schematic perspective view showing an example in which the attachment position of the terminal box to the main body can be changed according to the trip lock terminal voltage measuring device of FIG. 1. A groove 12 a as shown in the figure is formed in the main body 12. The terminal box 16 and the main body 12 can be fixed by, for example, using bolts and nuts (not shown), and tightening the bolts through the grooves 12a with nuts, thereby freely changing the mounting position of the terminal box 16. . It is also possible to change the direction of the surface from which the pair of contacts 18a, 18b protrudes. FIG. 3 shows an example in which the direction of the display surface of the voltmeter 22 and the protruding directions of the pair of contacts 18a and 18b are opposite to each other. In addition, it is possible to set arbitrarily.

  Therefore, since the terminal box 16 that accommodates the pair of contacts 18a and 18b is configured to be changeable in the mounting position on the main body 12, it is positional that the contacts 18a and 18b abut on the trip lock terminals 30a and 30b. If it is difficult, the contact position between the contactors 18a, 18b and the trip lock terminals 30a, 30b can be facilitated by changing the attachment position of the terminal box 16 to the main body 12. Also, with this configuration, the positional relationship between the pair of contacts 18a, 18b and the voltmeter 22 can be changed, so that the voltmeter 22 can be easily seen during voltage measurement.

  FIG. 4 is a circuit configuration diagram illustrating another embodiment of the voltage measuring device for trip lock terminals according to the present invention. A difference from the trip lock terminal voltage measuring instrument 10 shown in FIG. 1 is that a separate switch 42 that interlocks with the push button 24 is provided inside the main body 12, and the pair of contacts 18 a and 18 b is provided by this switch 42. A circuit is added so that LEDs 46 and 48 can identify which one of them is being measured. The circuit is configured using a battery 44, LEDs 46 and 48, and switches 42 and 50. Since the display unit is configured using the LEDs 46 and 48, the display unit can be configured at low cost. Further, it is possible to clearly determine which one of the pair of contacts 18a and 18b is measured by the light emission of the LEDs 46 and 48 without mistake.

  The added circuit will be described. When the push button 24 is pressed, the switch 42 and the switch 34 are configured to be interlocked. Similarly to the switch 34, the switch 42 is configured so that the terminal T4 is normally connected to the terminal T5 by a spring (not shown) and when the push button 24 is pressed, the terminal T4 is connected to the terminal T6. . The terminal T4 is connected to the positive electrode of the battery 44, the terminal T5 is connected to the positive electrode of the LED 48, and the terminal T6 is connected to the positive electrode of the LED 46. The negative electrode of the battery 44 is connected to one electrode of the switch 50, and the negative electrodes of the LEDs 46 and 48 are both connected to the other electrode of the switch 50. With this configuration, when the terminal 44 is connected to the terminal T5 by the battery 44, the LED 48 emits light, and when the terminal T4 is connected to the terminal T6, the LED 48 emits light. Therefore, when the pair of contacts 18a and 18b are brought into contact with the pair of trip lock terminals 30a and 30b, the voltmeter 22 is connected to the trip lock terminal 30b on the circuit breaker 28 side and the test ground terminal if the LED 48 emits light. 32, and if the LED 46 emits light, the voltmeter 22 displays the voltage between the trip lock terminal 30a on the protective device 40 side and the test ground terminal 32. Become.

  Therefore, it is possible to visually identify which trip lock terminal voltage is being measured. The LEDs 46 and 48 can be attached at any location on the main body 12, but it is desirable to attach them at a location where light emission is easy to see. In FIG. 4, a switch 50 controls the on / off of the LED light emitting circuit. The switch 50 can also be attached at any location on the main body 12, but it is desirable to install it at a location that does not interfere with the work.

  According to the trip lock terminal voltage measuring instrument 10 of the present embodiment, the pair of contactors 18a and 18b are brought into contact with the pair of trip lock terminals 30a and 30b, and the push button 24 is operated simply and efficiently. The voltage of a pair of trip lock terminals can be measured. Therefore, the efficiency of the voltage check operation of the trip lock terminal can be improved and the cost can be reduced.

  In addition, this invention is not limited to the above-mentioned form, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the voltmeter 22 is exemplified as an analog type, but may be a digital type. Moreover, although the banana clip 36a was used for the front-end | tip part of the lead wire 36 connected to the earth terminal 32 for a test, it does not care about this.

DESCRIPTION OF SYMBOLS 10 Voltage measuring device 12 for a trip lock terminal Main part 12a Groove part 14 Grasping part 16 Terminal box 18a, 18b Contact 20a, 20b Substantially circular-shaped recessed part 22 Electrode of voltmeter 23a, 23b 1, Other electrode 24 Push button 26 Power protection Control panel 28 Circuit breaker 30a, 30b Trip lock terminal 34, 42, 50 Switch 40 Protection device 46, 48 LED

Claims (3)

Trip lock terminal voltage for measuring a voltage between a pair of trip lock terminals provided at a predetermined interval on the power protection control panel and a test ground terminal provided on the power protection control panel In the measuring instrument,
A voltmeter for displaying the measured voltage;
A main body for housing the voltmeter;
A pair of contacts provided at intervals corresponding to the distance between the terminals of the pair of trip lock terminals, and abutting against the pair of trip lock terminals, respectively,
One electrode of the voltmeter is selectively connected to one of the pair of contacts by switching, and the other electrode of the voltmeter is connected to the ground terminal for testing ,
The voltage measuring instrument for trip lock terminals , wherein the pair of contacts are provided in a terminal box whose mounting position can be changed with respect to the main body .   2. The trip-lock terminal voltage measuring device according to claim 1, wherein each of the pair of contacts is formed with a substantially arc-shaped recess whose tip end matches the shape of the terminal shaft of the trip-lock terminal. The said main-body part has a display part which shows whether one electrode of the said voltmeter is connected to either of the said pair of contacts, Either of Claim 1 or 2 characterized by the above-mentioned. The voltage measuring instrument for trip lock terminals as described.

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