JP2014219289A - Electroscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroscope for detecting electric conduction to a voltage detection part, capable of accurately testing the electroscope itself.SOLUTION: An electroscope 1 comprises: a detection board 10 that has a function to detect alternating current conduction to a part to be detected, and outputs an application signal indicating application of a voltage when the voltage from the part to be detected of a railroad overhead wire or the like is applied to a hook 15; a notification board 20 for giving a notice when the application signal is output; a test board 30 that generates a test voltage corresponding to the voltage from the part to be detected and outputs the voltage from a jack 35; and an enclosure 5 that houses the detection board 10, the notification board 20, and the test board 30 therein and holds the hook 15 and the jack 35 so as to be exposed to the outside. The jack 35 and the hook 15 can be connected with a cable 50 attachable/detachable to/from the hook 15 outside the enclosure 5.

Description

  The present invention relates to a voltage detector that detects that power is supplied to a power detection unit.

  As such a voltage detector, one having a test function for testing whether or not the voltage detector itself operates is known (for example, see Patent Document 1). In this test function of the voltage detector, a test circuit is activated inside the voltage detector by pressing a test switch, and if the test result is passed, a notification is made.

Utility Model Registration No. 2535841

  However, in the above voltage detector, since the test circuit is operated inside the voltage detector without inputting the voltage for test from outside, the circuit for test is input from the input terminal to which the voltage from the voltage detection unit is applied. When a problem such as disconnection occurs in the section up to, there is a problem that the test result is passed but the function as a voltage detector cannot be realized in practice.

  Therefore, in view of such a problem, in the voltage detector that detects that the current to be detected is energized, it is possible to more accurately test the voltage detector itself. Objective.

  The voltage detector according to the present invention configured to achieve this object has a function of detecting that alternating current energization (energization by alternating current power (alternating current or alternating current voltage)) is performed on the portion to be tested. Then, when the voltage from the power detection unit is applied to the input terminal, a detection unit that outputs an application signal indicating that the voltage is applied, an application notification unit that performs notification when the application signal is output, A test unit that generates a test voltage corresponding to the voltage from the power-to-be-tested unit and outputs the test voltage, a detection unit, an application notification unit, and a test unit are housed inside, and an input terminal is provided. A housing that is held exposed to the outside. The input terminal is configured to be detachable from a cable (wiring) for inputting a test voltage to the input terminal via the outside of the housing.

  According to such a voltage detector, a test voltage can be input to the input terminal by connecting the cable to the input terminal. That is, a test voltage can be input from an input terminal that can be touched by the power-receiving unit. Therefore, even when a failure such as a disconnection occurs in the section from the input terminal to which the voltage from the voltage detection unit is applied to the test circuit, the voltage detector itself can be accurately tested.

  In addition, when the cable is separated from the input terminal and the input terminal is brought into contact with the part to be tested, it can function as a voltage detector. Further, the descriptions in the claims can be arbitrarily combined as much as possible. At this time, a part of the configuration may be excluded within a range where the object of the invention can be achieved.

1 is an external view of a voltage detector 1. FIG. 1 is a block diagram showing a schematic configuration of a voltage detector 1. FIG. It is explanatory drawing which shows arrangement | positioning of each board | substrate.

Embodiments according to the present invention will be described below with reference to the drawings.
[Configuration of this embodiment]
The voltage detector 1 to which the present invention is applied is used by being attached to the tip of a long ridge-like member (the ridge member 9), and is used as an alternating current to a to-be-tested part such as an overhead wire for a train or other electric circuit A function of detecting that energization (energization by alternating current) is performed is provided. In addition, a test function is provided for inspecting whether the voltage detector 1 itself operates normally.

  Here, FIG. 1 is an external view of a voltage detector 1 to which the present invention is applied. As shown in FIG. 1, the voltage detector 1 includes a housing 5 that houses various circuits to be described later, a conductive hook 15 that is exposed to the outside of the housing 5 on the upper surface 6 of the housing 5, and a housing. A jack 35 (see FIG. 2 and FIG. 3) as a terminal that is exposed to the outside on the lower surface 7 of the body 5, and a test cable 50 that can be electrically connected from the jack 35 to the hook 15. Yes.

  The test cable 50 includes a clip 51 (for example, a crocodile clip) that is detachable from the hook 15 at one end, and a plug 52 (see FIG. 2) that can be connected to the jack 35 at the other end. ing. The plug 52 has a rod-shaped tip portion, and the jack 35 is provided with a hole portion into which the tip portion is inserted and a gripping portion that grips the inserted tip portion with an appropriate force, and is inserted into the jack 35. The plug 52 is set so as not to be easily removed unless the operator pulls it out.

  Further, a fixing portion 8 for fixing the voltage detector 1 with respect to the collar member 9 is arranged on the lower surface 7 of the housing 5 so as to protrude, and the collar member 9 holds the fixing portion 8 by gripping the fixing portion 8. The voltage detector 1 is fixed to the gutter member 9. The voltage detector 1 is set so as to perform a predetermined notification when the hook 15 is touched to the power detection unit with the test cable 50 removed.

  As shown in FIG. 2, the voltage detector 1 includes a detection board 10, a notification board 20, a test board 30, and a battery 40 inside the housing 5. The battery 40 supplies power to the detection board 10 and the notification board 20 via the test board 30.

  The detection substrate 10 includes a level shift circuit 11, a both-wave rectification circuit 12, an output circuit 13, and a voltage dividing circuit 14. The voltage dividing circuit 14 receives the voltage from the hook 15, divides this voltage, and inputs it to the level shift circuit 11.

  As shown in FIG. 2, the voltage dividing circuit 14 includes resistors 14a, 14b, 14c and a capacitor 14d. The resistors 14a, 14b, and 14c are connected in series. In the resistor 14a, one end is connected to the hook 15 and the other end is connected to the resistor 14b and the level shift circuit 11.

The capacitor 14d is arranged in parallel with the resistor 14c, one end is connected to the resistor 14b, and the other end is grounded via an electrostatic stray capacitance.
Such a voltage dividing circuit 14 outputs an output to the level shift circuit 11 while suppressing a voltage drop when a DC voltage is inputted, and more than when a DC voltage is inputted when an AC voltage is inputted. It has a function (selection voltage drop means) for lowering the voltage and outputting to the level shift circuit 11. In order to realize such a function, the resistance value of the resistor 14c is set to a sufficiently large value with respect to the resistance values of the resistors 14a and 14b, and the DC component input from the hook 15 is hardly passed. Has been.

  That is, when a DC voltage is input from the hook 15, the voltage drop due to the resistor 14 a becomes small, and a relatively high voltage can be input to the level shift circuit 11. For this reason, the test function can be operated without boosting to a very high voltage in the booster circuit 33 described later.

  On the other hand, the capacitance of the capacitor 14d is set to a sufficiently small value. With this configuration, when an AC component is input from the hook 15, the presence of the capacitor 14d can be almost ignored. For this reason, when an AC voltage is input from the hook 15, voltage can be appropriately divided by the resistors 14a and 14b, and the charge charged in the capacitor 14d by the resistor 14c arranged in parallel with the capacitor 14d is moderately adjusted. Therefore, the voltage input to the level shift circuit 11 can be stabilized. The resistor 14c is not an essential configuration, and only the resistors 14a and 14b and the capacitor 14d may be arranged in series.

  The level shift circuit 11 receives the voltage from the voltage dividing circuit 14, blocks the input of an absolute value less than the reference voltage, and passes the input of the absolute value not less than the reference voltage. The level shift circuit 11 can be composed of, for example, a Zener diode. The reference voltage is set to such a voltage that noise input from the power-receiving unit cannot pass through the level shift circuit 11.

  The both-wave rectification circuit 12 performs both-wave rectification on the input that has passed through the level shift circuit 11. The both-wave rectifier circuit 12 can be composed of, for example, a transistor or a diode. The output circuit 13 outputs a predetermined signal (apply signal) for performing notification when there is an input subjected to both-wave rectification by the both-wave rectification circuit 12.

  The notification board 20 includes a notification circuit 21, a notification unit 22, and a test switch 23. The notification circuit 21 has a function for operating the notification unit 22 when an application signal is received from the detection substrate 10.

  For example, as illustrated in FIG. 3B, the notification unit 22 includes a plurality of LEDs (light emitting diodes) 25 to 27, a buzzer (not shown), and the like. The test switch 23 is configured as a well-known mechanical switch that is turned on only when pressed by an operator, and a signal indicating that the test switch is turned on is recognized on the test board 30.

  The test board 30 includes a voltage drop detection circuit 31 and a test circuit 32. The voltage drop detection circuit 31 monitors the voltage of the battery 40 and performs notification via the notification unit 22 according to the voltage of the battery 40.

  When the test circuit 32 receives a signal indicating that the test switch is turned on, the test circuit 32 uses the internal booster circuit 33 to generate a test voltage corresponding to the voltage from the power-receiving unit, and from the jack 35. Output. Here, the voltage generated in the test circuit 32 is a direct current.

  In the AC voltage detector 1, the normal idea is that the test voltage output from the test board 30 is also AC, but in this embodiment, the battery 40 is used as the power source for the test voltage. If the configuration is such that alternating current is generated from direct current, the circuit configuration may increase in size. For this reason, in this embodiment, the structure which outputs direct current | flow as a test voltage is employ | adopted.

  Here, the DC voltage output from the test board 30 is boosted to a voltage that can pass through the level shift circuit 11. With this configuration, it is possible to reliably perform a test while removing noise.

  In addition, since the detection substrate 10 of the present embodiment employs the double-wave rectifier circuit 12, even a DC input can be detected satisfactorily. It should be noted that the idea of applying a DC voltage to the configuration provided with the double-wave rectifier circuit 12 is considered to be a configuration specific to this embodiment. This is because the double-wave rectifier circuit 12 is not required in the configuration in which a DC voltage is applied.

  In such a voltage detector 1, when the voltage from the power detection unit is applied to the hook 15 in a state where the test cable 50 is not connected to at least one of the jack 35 and the hook 15, the detection board 10 is When the application signal indicating that the voltage is applied is output and the application signal is output from the detection substrate 10, the notification substrate 20 performs notification. When the test switch 23 is pressed in a state where the test cable 50 is connected to the jack 35 and the hook 15, the test board 30 generates a test voltage corresponding to the voltage from the power to be tested, and the jack 35. Output from.

Also at this time, an application signal is similarly output in the detection board 10, and the notification board 20 performs the same notification.
Here, as shown in FIG. 3A, the detection substrate 10 and the test substrate 30 are arranged along the axial direction of the fixed portion 8 in the support portion 45 extending in the axial direction of the fixed portion 8. On the other hand, the notification board 20 is disposed perpendicular to the axial direction of the fixed portion 8. That is, the notification board 20 is accommodated in the housing 5 at an angle different from that of the detection board 10 and the test board 30.

  Further, the detection board 10 and the test board 30 are arranged with the support part 45 therebetween, and the test board 30 and the battery 40 are also arranged with the support part 45 provided therebetween. That is, the detection board 10 and the battery 40 are arranged in the same direction when viewed from the support portion 45.

  With such a base arrangement, the component placement surfaces of the substrates 10, 20, and 30 are directed in different directions, so that the components placed on the substrates 10, 20, and 30 are less likely to interfere with each other. Therefore, it is possible to easily cope with a design change.

  Note that the detection substrate 10 and the battery 40 are separated by a partition wall portion 46 protruding from the support portion 45. This is to prevent the battery 40 from being affected by heat generation or liquid leakage.

  As shown in FIG. 3B, a plurality of LEDs serving as the notification unit 22 are provided, and when performing notification corresponding to the application signal (notification based on a command from the output circuit 13), the LEDs 25 and 27 are provided. Is turned on and a buzzer sounds. Further, when performing notification corresponding to the voltage of the battery 40 (notification based on the command of the voltage drop detection circuit 31), the LED 26 is turned on.

  In particular, the LED 26 is configured to be lit in a plurality of colors such as red and green. For example, the voltage drop detection circuit 31 is green when the battery voltage is in a normal range (when it is equal to or higher than the threshold voltage). When the battery voltage is low (less than the threshold voltage), it is lit red.

[Effects of this embodiment]
The voltage detector 1 described in detail above has a function of detecting that AC current is supplied to the power detection unit (energization by AC current), and the hook 15 has a function of detecting power to be detected such as a train overhead wire. When the voltage from the unit is applied, the detection board 10 that outputs an application signal indicating that the voltage has been applied, the notification board 20 that performs notification when the application signal is output, and the voltage from the power-receiving unit The test board 30 that generates a test voltage corresponding to 1 and outputs from the jack 35, the detection board 10, the notification board 20, and the test board 30 are housed inside, and the hook 15 and the jack 35 are exposed to the outside. The jack 35 and the hook 15 are configured to be connectable by a cable 50 that can be attached to and detached from the hook 15 outside the housing 5.

  According to such a voltage detector 1, a test voltage can be input to the hook 15 by connecting the cable 50 to the hook 15. At this time, a closed loop is formed by the test board 30, the jack 35, the cable 50, the hook 15, and the detection board 10. Therefore, even when a failure such as a disconnection or a component failure occurs in the section from the hook 15 to which the voltage from the power-receiving unit is applied to the test circuit, the test of the voltage detector 1 itself should be performed accurately. Can do.

  Note that, when the cable 50 is separated from the hook 15 and the hook 15 is brought into contact with the portion to be tested, it can function as the voltage detector 1. At this time, a closed loop is formed by a power source such as a substation, a power-to-be-tested unit, the hook 15, the detection board 10, and the ground connected via the electrostatic stray capacitance.

In the voltage detector 1, the detection board 10, the notification board 20, and the test board 30 are driven by a common battery 40.
According to such a voltage detector 1, since it is not necessary to provide a separate power source, the management of the power source can be simplified.

Furthermore, in the above-described voltage detector 1, the jack 35 is configured such that the cable 50 is detachable.
According to such a voltage detector 1, it is possible to remove the test cable 50 that is not required when the voltage detector 1 is not tested (when the current-carrying part is detected).

In the voltage detector 1, the jack 35 is disposed on the surface of the housing 5 that faces the surface on which the hook 15 is disposed.
According to such a voltage detector 1, when the hook 15 is to be in contact with a power-to-be-tested part such as an overhead wire at a high position, it is convenient to arrange the hook 15 on the upper surface. In this case, the jack 35 is disposed on the lower side, which is preferable from the viewpoint of waterproofness.

  Further, in the voltage detector 1, the detection substrate 10 blocks the input of the absolute value less than the reference voltage and passes the input of the absolute value equal to or higher than the reference voltage, and the input passed through the level shift circuit 11. And the output circuit 13 that outputs an applied signal when there is an input that has been subjected to both-wave rectification by the both-wave rectification circuit 12. A DC voltage that is equal to or higher than the reference voltage is generated.

  According to such a voltage detector 1, noise can be removed satisfactorily using the level shift circuit 11. In addition, since the test substrate 30 (boost circuit 33) generates a voltage that passes through the level shift circuit 11, the test function can be operated satisfactorily.

  Further, in the configuration of the present embodiment, the output circuit 13 can output an application signal even when a DC voltage is generated as well as an AC voltage. In this way, the configuration that outputs a DC voltage can be made smaller than the configuration that outputs an AC voltage, which is advantageous from the viewpoint of weight reduction.

  In the voltage detector 1, a voltage drop detection circuit 31 that detects a voltage drop of the battery 40 that drives the detection board 10, the notification board 20, and the test board 30, and an application signal when a voltage drop is detected. And a notification board 20 that performs notification different from the output case.

  According to such a voltage detector 1, when a voltage drop is detected, a notification different from the case where the applied signal is output is performed. Therefore, the output of the test and the output of the voltage applied from the power-receiving unit and the battery 40 are detected. Can be distinguished from the voltage drop.

  Further, in the voltage detector 1, the voltage drop detection circuit 31 also detects that the voltage of the battery 40 is a normal value (a state where the battery 40 is not dropped), and the notification board 20 Different notifications are performed when the voltage is normal and when the voltage drop of the battery 40 is detected.

  According to such a voltage detector 1, since the notification is performed even when the voltage of the battery 40 is normal, it is possible to identify the case where the notification board 20 does not function (when the battery 40 is completely exhausted or has failed). it can.

[Other Embodiments]
The present invention is not construed as being limited by the above embodiment. Moreover, the aspect which abbreviate | omitted a part of structure of said embodiment as long as the subject could be solved is also embodiment of this invention. An aspect configured by appropriately combining the above-described plurality of embodiments is also an embodiment of the present invention. Moreover, all the aspects which can be considered in the limit which does not deviate from the essence of the invention specified only by the wording described in the claims are embodiments of the present invention.

For example, in the above embodiment, the cable 50 is detachable with respect to both the hook 15 and the jack 35, but may be detachable only with respect to the hook 15.
In the above embodiment, when a DC voltage is input, output is performed to the level shift circuit 11 while suppressing a voltage drop, and when an AC voltage is input, the voltage is higher than when the DC voltage is input. The function of lowering and outputting to the level shift circuit 11 is realized in the voltage dividing circuit 14, but may be realized by microcomputer control or other circuit configurations.

[Correspondence between Configuration of Embodiment and Means of Present Invention]
The detection substrate 10 in the above embodiment corresponds to the detection unit of the present invention, and the level shift circuit 11 in the above embodiment corresponds to the level shift unit of the present invention. Further, the double-wave rectifier circuit 12 in the above embodiment corresponds to a rectifying unit of the present invention, and the output circuit 13 in the above embodiment corresponds to an output unit of the present invention. Furthermore, the hook 15 in the above embodiment corresponds to an input terminal of the present invention, and the notification board 20 in the above embodiment corresponds to a descent notification unit of the present invention. In addition, the notification board 20 in the above embodiment corresponds to the application notification section of the present invention, and the test board 30 in the above embodiment corresponds to the test section of the present invention. Further, the voltage drop detection circuit 31 in the above embodiment corresponds to the voltage drop detection unit of the present invention, and the booster circuit 33 in the above embodiment corresponds to the boosting unit of the present invention.

  The jack 35 in the above embodiment corresponds to the test voltage output terminal of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Voltage detector, 5 ... Housing | casing, 8 ... Fixed part, 9 ... Gutter member, 10 ... Detection board | substrate, 11 ... Level shift circuit, 12 ... Both-wave rectifier circuit, 13 ... Output circuit, 14 ... Voltage divider circuit, 15 DESCRIPTION OF SYMBOLS ... Hook, 20 ... Notification board, 21 ... Notification circuit, 22 ... Notification section, 23 ... Test switch, 25-27 ... LED, 30 ... Test board, 31 ... Voltage drop detection circuit, 32 ... Test circuit, 33 ... Boosting section 35 ... Jack, 40 ... Battery, 45 ... Support part, 46 ... Bulkhead part, 50 ... Test cable, 51 ... Clip, 52 ... Plug.

Claims (9)

An AC voltage detector for detecting that AC power is being supplied to the power-receiving unit,
When a voltage from the power-receiving unit is applied to the input terminal, a detection unit that outputs an application signal indicating that the voltage is applied;
An application notification unit for performing notification when the application signal is output;
A test unit that generates a test voltage corresponding to the voltage from the test unit, and outputs the test voltage from a test voltage output terminal;
A housing that houses the detection unit, the application notification unit, and the test unit inside, and holds the input terminal and the test voltage output terminal exposed to the outside,
A voltage detector characterized by comprising: An AC voltage detector for detecting that AC power is being supplied to the power-receiving unit,
When a voltage from the power-receiving unit is applied to the input terminal, a detection unit that outputs an application signal indicating that the voltage is applied;
An application notification unit for performing notification when the application signal is output;
A test unit that generates a test voltage corresponding to the voltage from the test unit and outputs the test voltage;
A housing that houses the detection unit, the application notification unit, and the test unit inside, and holds the input terminal exposed to the outside,
A cable for inputting the test voltage to the input terminal via the outside of the housing, and a cable detachable from the input terminal;
A voltage detector characterized by comprising: The voltage detector according to claim 2,
The housing includes a test voltage output terminal that is held in a state exposed to the outside of the housing and outputs the test voltage.
The test voltage output terminal is configured such that the cable is detachable. In the voltage detector according to any one of claims 1 to 3,
A voltage detector comprising: a battery that drives the detection unit, the application notification unit, and the test unit. In the voltage detector according to any one of claims 1 to 4,
The test voltage output terminal is arranged on the opposite side of the input terminal with the casing interposed therebetween. The voltage detector according to any one of claims 1 to 5,
The detector is
A level shift unit that blocks input of an absolute value less than a reference voltage and allows input of an absolute value greater than the reference voltage to pass;
A rectification unit that rectifies both waves of the input that has passed through the level shift unit;
An output unit that outputs the applied signal when there is an input subjected to both-wave rectification in the rectifying unit,
The test unit
A voltage detector comprising: a boosting unit that generates a voltage that is equal to or higher than the reference voltage as the test voltage. The voltage detector according to claim 6, wherein
The voltage booster generates a DC voltage. In the voltage detector according to any one of claims 1 to 7,
A voltage drop detection unit for detecting a voltage drop of a battery that drives the detection unit, the application notification unit, and the test unit;
When the voltage drop is detected, a drop notification unit that performs notification different from the notification by the application notification unit,
A voltage detector characterized by comprising: The voltage detector according to claim 8, wherein
The voltage drop detection unit also detects that the voltage of the battery is a normal value,
The voltage drop notification unit performs different notifications when the battery voltage is a normal value and when the battery voltage drop is detected.

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