JPH08241662A - Oil dash pot operation testing device - Google Patents

Abstract

PURPOSE: To provide an oil dash pot operation testing device for an actuator of an over-current breaker, which permits a high working efficiency in performing the test and prevents mixed existence of acceptable and unacceptable articles resulting from misunderstanding of an operator. CONSTITUTION: A primary coil 11 is wound round an oil dash pot 9 placed on a yoke 13 while the secondary coil 12 is wound on the yoke 13. The secondary voltage of the secondary coil 12 is transmitted to a calculation part 50 via an A/D converter 44 from a data measuring part 40, and the measured voltage difference is compared with the reference value, and it is possible to make distinction between acceptable and unacceptable oil dash pots while watching the indication given on a display of a judging part 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-magnetic cylinder formed in a bottomed cylindrical body, a magnetic plunger reciprocating in the cylinder, and a coil spring capable of urging the plunger. An actuator mechanism for an overcurrent breaker for wiring or the like, which is composed of braking oil that can brake the plunger and a magnetic armature that engages with a coil spring and press-fits into the opening of the cylinder to seal the braking oil. The present invention relates to an operation test device for an oil dash pot used in. More specifically, the overcurrent breaker protects electrical equipment and circuit members from accidents by automatically shutting off the electrical circuit when an overcurrent exceeding the rating due to overload or short circuit occurs in the electrical circuit. The plunger (movable iron core) inside the oil dash pot is moved by the magnetic force of the exciting coil provided around the oil dash pot to form a magnetic pole on the armature at the end of the oil dash pot. The present invention is designed to mechanically turn off the switch for adsorbing one end of the lever mechanism to open and close the power supply to the secondary side of the overcurrent breaker. Before installing it in the cylinder, the operability of the plunger is tested and the plunger operates normally in the cylinder. Encapsulation leakage of the brake oil relate test device for the determination and the oil dash pot defective not operate normally due.

[0002]

2. Description of the Related Art As a conventional technique, for example, an operation test device for an oil dash pot shown in FIG. 7 is known.
The configuration of this operation test device is as follows.

The U-shaped yoke 93 has an insertion hole 93a formed in the central portion of the upper plate through which the oil dash pot 9 can be inserted, and the central portion of the lower plate projects to the lower surface at a position facing the insertion hole 93a. The support 93, which is made of a non-magnetic material, has the protrusions 93b fixed thereto.
It is attached to the upper part of 6A and 96B. The support base 96
A and 96B are attached to the upper surface of the non-magnetic test base 92. In the exciting coil 91, a non-magnetic charging cylinder 94 capable of charging the oil dash pot 9 is fixed between the insertion hole 93a of the yoke 93 and the upper surface of the lower plate above the protrusion 93b, and the upper and lower sides are insulated from the outer circumference thereof. It is wound by being sandwiched between the members 95, 95.

Further, the L-shaped hinge 97 has a magnetic end 9
7a is swingably pivotally supported by the support base 96A at a position where it can come into contact with the protrusion 93b of the yoke 93, and the working end 97
The magnetic spring 97b is attached to the coil spring 9a so that the magnetic end 97a can be urged downward.
9 is attached. The micro switch 98 has its actuator portion capable of contacting the working end portion 97b of the hinge 97, and the magnetic switch end portion 97a of the hinge 97 contacts the projection 93b of the yoke 93.
Is activated to attach the timepiece to the upper surface of the test table 92 at a position where the time integration of a timer (not shown) can be turned off.

The armature 5 press-fitted into the cylinder 1
When the oil dash pot 9 is placed in the charging cylinder 94 such that the lower end surface of the oil abuts the upper surface of the lower plate of the yoke 93 and an exciting current is applied to the exciting coil 91, a magnetic field is formed around the oil dash pot 9. Since the magnetic flux passes from the plunger 2 of the oil dash pot 9 and the armature 5 to the magnetic path that goes around the U-shaped yoke 93, the plunger 2 that is a movable iron core
Approaches the armature 5 against the elastic force of the coil spring 3 and the fluid resistance force of the braking oil 4.

Since the magnetic flux when the exciting current is constant is inversely proportional to the square of the gap distance between the plunger 2 and the armature 5,
At the beginning of energization, the magnetic flux is small because the magnetic flux is small, and as the plunger 2 approaches the armature 5, the magnetic flux increases and the magnetic force becomes stronger. When the plunger 2 is attracted to the armature 5, the magnetic flux becomes maximum and the magnetic force increases. Is the maximum. At the time when the magnetic end 97a of the hinge 97 is attracted to the protrusion 93b of the yoke 93, the leverage force of the hinge 97 acting on the magnetic end 97a by the attractive force of the magnetic flux causes the action end 97 to move.
This is when the force is larger than the leverage force of the hinge 97 acting by the elastic force of the coil spring 99 and the micro switch 98 to the b.

The elastic force of the coil spring 99 is determined by the winding length of the exciting coil 91, the cross-sectional area of the yoke 93, and the hinge 9.
Magnetic end 97a and action end 97b with respect to the swing center of
And the cross-sectional area of the plunger 2 and the armature 5 of the oil dash pot 9 to be tested, the specified value of the exciting current to be tested, and the like.

Further, from the start of the test (start of energizing the exciting current) to the end of the test (the magnetized end 97a of the hinge 97 is connected to the yoke 93).
The relationship between the test operation time of the oil dash pot 9 up to the time point when the oil dash pot 9 is adsorbed to the protrusion 93b) and the actual operation time when the oil dash pot 9 is incorporated in the overcurrent circuit breaker is
Relationship data is created in advance for each non-defective product and defective product such as no coil spring 3, no plunger 2, no braking oil 4,
Based on the comparison between the test operation time and the actual operation time, it is determined whether the oil dash pot is a good product that operates normally and the oil dash pot that is a defective product that does not operate normally.

Next, the procedure for determining whether a good oil dash pot that normally operates and a bad oil dash pot that does not normally operate by the conventional operation test device is as follows.

Before starting the operation test, the exciting current supplied to the exciting coil 91 is set to a predetermined value in advance, the integration time of a timer (not shown) is reset to 0 (zero) in advance, and the armature 5 is placed under the yoke 93. The oil dash pot 9 is placed in advance in the charging cylinder 94 so as to come into contact with the upper surface of the plate.

At the start of the operation test, the exciting coil 9
When an exciting current preset to a prescribed value is applied to 1, a magnetic flux flows from the plunger 2 of the oil dash pot 9 and the armature 5 to the magnetic path around the U-shaped yoke 93, and the magnetic force causes the plunger 2 to move to the armature. Approaching 5 When the plunger 2 reaches a predetermined position, the magnetically attracted end 97a of the hinge 97 causes the yoke 9 to move due to the attractive force of the magnetic flux.
3 is attracted to the protrusion 93b, and the working end 97 of the hinge 97 is
The actuator portion of the micro switch 98 is pressed by b, the time integration of a timer (not shown) is turned off, and the test ends. The accumulated time of the timer (not shown) from the start of the test to the end of the test is the test operation time, and it is compared with the data related to the actual operation time created in advance, and the oil dashpot of a good product that operates normally is It is determined as a defective oil dash pot that does not work.

[0012]

The actuator section for shutting off the overcurrent of the overcurrent breaker is constructed as shown in the explanatory view of FIG. The L-shaped yoke 83 is provided with a support portion 83a capable of supporting a hinge 87 described later on the upper portion of the vertical plate, and the cylinder 1 of the oil dash pot 9 is provided at the end portion of the lower plate.
A press-fitting hole 83b capable of press-fitting is formed, and a press-fitting hole 83d capable of press-fitting the cylinder 1 of the oil dash pot 9 is provided on the upper surface side of the press-fitting hole 83b to provide a reinforcing member 83.
c is fixed.

The oil dash pot 9 includes a cylinder 1 of a non-magnetic material formed in a bottomed cylindrical body, a plunger 2 of a magnetic material in which the tip portion is formed with a small diameter in the cylinder 1 and which can reciprocate, and the plunger 2. A coil spring 3 that can be biased, a braking oil 4 that can brake the plunger 2, and a magnetic body that engages with the coil spring 3 and presses a small diameter portion into the opening of the cylinder 1 to seal the braking oil 4. In the oil dash pot 9, the oil dash pot 9 is pressure-bonded to the pressure-bonding holes 83b and 83d of the yoke 83 below the cylinder 1 with the armature 5 facing upward. The exciting coil 81 is wound around the outer periphery of the center of the cylinder 1 of the oil dash pot 9.

The L-shaped hinge 87 is engaged with the support portion 83a of the yoke 83 and has an engaging portion 87c that is swingable, and the magnetic end 87a has the magnetic end portion 87a.
At a position where it can come into contact with the armature 5 of the robot and the working end portion 87b.
Is swingable at a position where a switch actuator portion of an overcurrent circuit breaker (not shown) can be pressed, and an engaging portion 87c has a yoke 83.
The coil spring 89 is supported by the support portion 83a of the above, and the magnetic spring 87a is biased upward so that the coiled spring 89 is engaged with the upper portion of the action end 87b and the vertical plate portion of the yoke 83.

When an exciting current is applied to the exciting coil 81, a magnetic field is formed around the oil dash pot 9, and the plunger 2 and the armature 5 of the oil dash pot 9 are formed.
The magnetic flux passes through the magnetic path from the to the L-shaped hinge 87 and the L-shaped yoke 83. However, in the overcurrent breaker, when an overcurrent exceeding the rating flows in the exciting coil 81, the movable iron core A plunger 2 has elastic force of the coil spring 3 and the braking oil 4.
Against the fluid resistance of the armature, the plunger 2 moves at a speed depending on the value of the magnetic flux corresponding to the value of the overcurrent exceeding the rating.
Is configured to approach.

The value of the magnetic flux flowing in the magnetic path is proportional to the value of the overcurrent, and is inversely proportional to the square of the gap distance between the plunger 2 and the armature 5. Therefore, when the value of the overcurrent is constant,
At the beginning of the overcurrent flow, the magnetic flux is small and the magnetic force is weak. As the plunger 2 approaches the armature 5, the magnetic flux increases and the magnetic force becomes stronger. When the plunger 2 is attracted to the armature 5, the magnetic flux becomes maximum. The magnetic force becomes maximum. Hinge 8
When the magnetic end 87a of No. 7 is attracted to the armature 5, the lever force of the hinge 87 acting on the magnetic end 87a by the attractive force of the magnetic flux of the magnetic flux causes the coil spring 89 to act on the end 87b. And the lever force of the hinge 87 acting by the elastic force of the switch (not shown).

The overcurrent circuit breaker is
The operating time until the magnetic end 87a of the hinge 87 is attracted to the armature 5 of the oil dash pot 9 and the lever 87 causes the working end 87b of the hinge 87 to press a switch (not shown) to shut off the overcurrent. However, the rated current of the circuit breaker is 30 A, for example.
When the current exceeds 50 A and exceeds 50 A, it takes 4 minutes at an overcurrent of 200% of the rated current and 6 minutes at an overcurrent of 125% of the rated current
It is defined as 0 minutes.

By the way, since the conventional oil dashpot operation test device has substantially the same structure as the overcurrent circuit breaker, the test time of the oil dashpot operation test is, for example, 200% of the rated current. A long test time of about 4 minutes was required at the electric current, and there was a problem that work efficiency was low.

Further, the determination of a good oil dash pot that normally operates and a defective oil dash pot that does not normally operate is performed by determining the relation between the measured test operating time and the actual operating time created in advance and the operator. However, there is a problem that an erroneous determination occurs due to misunderstanding.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to shorten the test time to improve the work efficiency and to prevent the erroneous determination due to the misunderstanding of the operator. It is intended to provide an operation test device for an oil dashpot that does not occur.

[0021]

In order to achieve the above-mentioned object, an operation test device for an oil dash pot according to claim 1 of the present invention is configured such that the oil dash pot is formed on a U-shaped upper plate portion. And a yoke member of a magnetic body on which the oil dash pot can be placed with the armature at the lower end on the upper surface of the lower plate portion formed in a U shape by forming an insertion hole so that A primary coil that is provided in a cylindrical shape around the mounted oil dash pot and applies a primary voltage of a sinusoidal alternating current, and the primary coil that is provided around a U-shaped vertical plate portion of the yoke member. A secondary coil in which a secondary voltage of sinusoidal alternating current is induced by a primary voltage of sinusoidal alternating current applied to the coil and a secondary voltage of sinusoidal alternating current induced in the secondary coil is rectified, amplified and digitally converted. To measure Data measuring means and the secondary voltage measured by the data measuring means are repeatedly stored for each measurement unit time, and the measured voltage difference between the current measured voltage and the previous measured voltage is set to a preset reference voltage difference. Result of judgment whether the oil is a good oil dash pot in which the plunger normally operates in the cylinder or the oil dash pot of a defective product that does not operate normally by the operation means for performing a comparison operation and the signal from the operation means. And a determination means for displaying.

Further, in the operation test device for the oil dash pot according to the second aspect, the judgment result by the judging means between the good oil dash pot that normally operates and the bad oil dash pot that does not normally operate is determined as a good product or a non-defective product. A lamp is turned on or off only for an oil dash pot that is determined to be a defective product for identification.

Further, in the operation test device for the oil dash pot according to the third aspect, the judgment result by the judging means between the good oil dash pot that normally operates and the bad oil dash pot that does not normally operate is determined as a good product or a good product. Only the oil dash pot determined to be defective is moved upward to be identified.

[0024]

The operation according to claim 1 of the present invention constructed as described above will be described as follows.

When a primary coil provided around the oil dash pot is energized, a magnetic field is formed and an electromagnet is constituted by the primary coil and the oil dash pot. The plunger of the oil dash pot and the armature have a U-shaped yoke member. Since the magnetic flux passes through the magnetic path around each magnetic substance of
The plunger, which is the movable iron core of the electromagnet, approaches the armature against the elastic force of the coil spring and the fluid resistance of the braking oil. The value of the magnetic flux flowing between the plunger and the armature is inversely proportional to the square of the gap distance between the plunger and the armature when the current value of the current flowing through the primary coil is constant, so that the current in the primary coil is Since the gap distance between the plunger and the armature is maximum at the beginning of flow, the magnetic flux is small, the magnetic flux increases as the plunger approaches the armature, and the magnetic flux becomes maximum when the plunger is attracted to the armature.

Since the secondary coil is provided around the vertical plate portion of the yoke member, the structure is based on the principle of an AC transformer. When a sinusoidal AC voltage is applied to the primary coil to pass a current, the yoke member is formed. Since a sinusoidal magnetic flux passes through the inside, and this magnetic flux interlinks with the primary coil and the secondary coil to alternate, electromotive force is generated in the primary coil by self-induction action and in the secondary coil by mutual induction action. Is induced. Each electromotive force is proportional to the magnetic flux, and the electromotive force induced in the primary coil and the electromotive force induced in the secondary coil are proportional to the number of turns of each coil. Therefore, since the secondary voltage induced in the secondary coil changes in proportion to the magnetic flux that changes (increases) as the plunger of the oil dashpot approaches the armature, the amount of movement of the plunger and the secondary coil A certain relationship is obtained with the secondary voltage.

Then, the secondary voltage of the sinusoidal alternating current induced in the secondary coil is rectified, amplified, digitally converted, etc. by the data measuring means, and the secondary voltage is repeatedly stored by the calculating means every measurement unit time. Comparing the measured voltage difference between the measured voltage and the previous measured voltage with the preset reference voltage difference, and using the signal from the calculation means, the judgment means makes the plunger operate normally in the cylinder. Is displayed, or it is a defective oil dash pot that does not operate normally.

According to the second aspect of the present invention, the determination result of the non-defective oil dash pot that is normally operated and the defective oil dash pot that is not normally operated by the determination means is determined to be a good item or a defective item. Identify by turning on or off the lamp only for the oil dash pot.

In addition, according to the third aspect of the present invention, the determination result of the non-defective oil dash pot that normally operates and the non-defective oil dash pot that normally operates is determined to be non-defective or defective by the determination means. Move only the oil dash pot upwards to identify.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment according to claims 1 and 2 of the present invention will be described below with reference to FIGS. 1 to 3 and 5.

FIG. 1 is a partial cross-sectional view showing the test portion 10. The U-shaped yoke 13 has an insertion hole 13a formed in the central portion of the upper plate through which the cylinder 1 of the oil dash pot 9 can be inserted. They are attached to the upper surface of the non-magnetic insulating lower plate 18 and the lower surface of the insulating upper plate 17. In the primary coil 11, a non-magnetic charging cylinder 14 capable of charging the oil dash pot 9 is fixed between the insertion hole 13a of the yoke 13 and the upper surface of the lower plate, and upper and lower insulating members 15 and 15 are provided on the outer circumference thereof. It is sandwiched and wound. The secondary coil 12 is wound around the central portion of the vertical plate of the yoke 13 and is connected to the rectifier 41 of the data measuring unit 40 shown in FIG. The coils are heated during the operation test of the primary coil 11 and the secondary coil 12, and the winding resistance changes with the passage of time to cause a test error, so that the coils are cooled by a cooling fan (not shown). The test section 10 is arranged on the upper surface of the test stand 16 shown in FIG.

FIG. 2 is a side view showing the structure of the entire apparatus. An insulating lower plate 18 is attached to the upper surface of the test stand 16 and an insulating upper plate 17 is attached above the insulating lower plate 18. The test section 10 is disposed between the insulating lower plate 18 and the insulating upper plate 17. For each stage from the first stage on the upper side of the slope to the third stage on the lower side, the test unit 10 is composed of 30 in each row.
First-stage testing section 10A of second stage, second-stage testing section 1 of second stage
0B and the third-stage test section 10C of the third stage are respectively provided. Further, the control panel 1 is provided on the upper right side of the test stand 16.
9 is attached with a display surface 19a. The three-stage test section including the first-stage test section 10A, the second-stage test section 10B, and the third-stage test section 10C is provided because the primary coil 11 and the secondary coil 12 heated during the test are not provided. This is to reduce the test error by cooling during the test of the step.

FIG. 3 is a block diagram showing a control system, which is roughly divided into a setting section 20, a measurement start input section 30, a data measuring section 40, a computing section 50, and a judging section 60. The setting unit 20 is provided on an operation panel (not shown), and includes a cut voltage setting device 21 that sets a range of unmeasured voltage in an unstable region at the beginning of the test, a reference voltage difference setting device 22 that sets a reference voltage difference, and the like. Has been done.

The measurement start input section 30 is provided on an operation panel (not shown), and has a reset push button 31 for turning off a judgment lamp, which will be described later, at the stage tested previously in the operation test, and a high level generated at the start of the test. A T1 timer relay 32 for inputting a measurement start by the operation of a T1 timer (not shown) provided for not measuring the voltage during an operation initial cut time t1 shown in FIG.
First stage test section 10A disposed in No. 6 and second stage test section 10
B and the first-stage relay 33 for inputting the measurement start of the stage to be tested of the third-stage testing section 10C of the third stage
a, a second stage relay 33b and a third stage relay 33c,
Inputting the measurement end by the operation of a T2 timer (not shown) for setting the measurement end time t2 shown in FIG. 5 described later T2
It is composed of a timer relay 34 and the like.

The data measuring section 40 includes a rectifier 41 for rectifying a sine wave AC secondary voltage output from the secondary coil 12 of the test section 10 into a DC voltage, and a voltage for amplifying the secondary voltage rectified by the rectifier 41. Amplifier 42 and voltage amplifier 42
The secondary voltage amplified by
It is composed of an analog switch 43 which is switched for each channel up to the first channel, an A / D converter 44 which converts an analog secondary voltage into a digital secondary voltage, and the like. The calculation unit 50 exchanges data with the data measurement unit 40 and the determination unit 60 described below to perform calculation and storage.

The judging section 60 includes a decoder (not shown), a waveform shaper 61 that shapes the waveform of the signal from the measurement start input section 30, and a display surface 1 of the control panel 19 that displays the judgment result.
The determination lamp 62 provided in 9a, a lamp driver (not shown) for turning on the determination lamp 62, a cut voltage setting device 21, a reference voltage difference setting device 22, an A / D converter 44, a calculation unit 50, a waveform shaping device. 61, a decoder (not shown), a digital input / output unit 63 for inputting / outputting signals to / from a lamp driver (not shown), and the like. Note that the A / D converter 44 of the data measuring unit 40, the arithmetic unit 50, and the digital input / output unit 63 of the determining unit 60 are exchanged via the slot 51.

Subsequently, the configuration of the embodiment according to claim 3 will be described as follows with reference to FIGS.

FIG. 4 is a partial cross-sectional view showing the test unit 70 according to claim 3 with the reference numerals changed only for the components that are not common to the test unit 10 of FIG. Insertion hole 73 through which the oil dash pot 9 can be inserted in the central part of the plate
a, and an insertion small hole 73b into which a pusher 75 described later can be inserted in a lower plate substantially concentric with the insertion hole 73a, and attached to the upper surface of the insulating lower plate 78 and the lower surface of the insulating upper plate 17 which are non-magnetic materials. Has been done. The primary coil 11 has an insertion hole 73 a of the yoke 73.
A non-magnetic charging cylinder 14 capable of charging the oil dash pot 9 is fixed between the upper surface of the lower plate and the upper surface of the lower plate, and the upper and lower sides of the charging cylinder 14 are sandwiched by insulating members 15 and 15 and wound. The secondary coil 12 is wound around the vertical plate central portion of the yoke 73.
It is connected to the rectifier 41 of the data measuring section 40 shown in FIG.

In the solenoid 74, an exciting coil 74b is wound around a plunger 74a, and a press-fitting hole 74c into which a pressing member 75 described later can be press-fitted at the tip of the plunger 74a.
And is attached to the lower surface of the insulating lower plate 78 at a position substantially concentric with the insertion small hole 73b of the yoke 73. For the operation of the solenoid 74, a solenoid driver (not shown) is provided in the determination unit 60 shown in FIG.
1, an OK signal is transmitted to a solenoid driver (not shown) of the determination unit 60, the exciting coil 74b is excited, and the plunger 74a, which is a movable iron core, is raised. The insulating lower plate 78 is provided with an insertion hole 78a capable of inserting a large diameter portion of a pressing element 75 described later at a position substantially concentric with the insertion small hole 73b of the yoke 73, and the press-fitting hole 74c of the solenoid 74 is One small-diameter portion of the pressing element 75, which has a large central portion and a small diameter at both ends, is press-fitted so that the oil dash pot 9 can be pressed by raising the plunger 74a. The test units 70 are arranged on the upper surface of the test stand 16 shown in FIG. 2 at positions of the first-stage test unit 10A to the third-stage test unit 10C, respectively.

Subsequently, the test procedure and operation of the embodiments according to claims 1 and 2 of the present invention will be described below with reference to FIGS. 1 to 3 and 5.

In the operation test apparatus for the oil dash pot according to the present invention, the operation failure due to the small inner diameter of the cylinder 1 or the large outer diameter of the plunger 2 shown in FIG. An operation test is performed in order to prevent a defective oil dash pot 9 such as an operation failure due to the charging failure of the spring 3 or an operation failure due to the leakage of the brake oil 4 from being mixed with a normally operating good product. However, of these, the oil dash pot 9 in which the coil spring 3 is not inserted, when the armature 5 is left upward for a long time, the plunger 2 comes into contact with the bottom of the cylinder 1 and the coil spring 3 is normally installed. Since the same operation as that of the inserted coil spring 3 is performed, it is not possible to judge whether the coil spring 3 is not properly inserted. Therefore, before starting the test, the armature 5 is left downward for about 60 minutes or more in advance, and if the coil spring 3 is left unloaded, the operation test is performed after the plunger 2 is brought into contact with the armature 5. To do.

The test procedure is as follows. First, in the operation test, the measurement start cut voltage v1 shown in FIG. 5 described later of the cut voltage setting device 21 shown in FIG. 3 for setting the range of the unmeasured voltage in the unstable region at the beginning of the test. And a measurement voltage difference Δv between the current measurement voltage vy and the previous measurement voltage vx of the measurement voltage vn measured at each measurement unit time Δt shown in FIG. The reference voltage difference v2 of the reference voltage difference setter 22 shown in FIG. 3 and the high level voltage generated at the time of starting the test are set so as not to be measured during the initial operation cut time t1 shown in FIG. The operating time of the T1 timer which is not set and the operating time of the T2 timer (not shown) which sets the measurement end time t2 shown in FIG.

Next, the armature 5 is placed downward on each of the 30 test units 10 of the first-stage test unit 10A to the third-stage test unit 10C shown in FIG. 2 to be tested. The oil dash pot 9 is mounted as shown in FIG.

Next, the judgment lamp 62 in the previous test is turned off by the reset push button 31 shown in FIG.
After designating the stage on which the oil dash pot 9 is placed among the stage test unit 10B and the third stage test unit 10C, a test start push button (not shown) is turned on.

When a test start push button (not shown) is turned on,
The primary coil 11 shown in FIG. 1 is excited to form a magnetic field around the oil dash pot 9, and an electromagnet is constituted by the primary coil 11 and the oil dash pot 9, and the plunger 2 and the armature 5 of the oil dash pot 9 Since the magnetic flux passes through the magnetic path around each magnetic body of the U-shaped yoke 13, the plunger 2 which is the movable iron core of the electromagnet resists the elastic force of the coil spring 3 and the fluid resistance force of the braking oil 4. Approach the armature 5. The value of the magnetic flux flowing between the plunger 2 and the armature 5 is inversely proportional to the square of the gap distance between the plunger 2 and the armature 5 when the current value of the current flowing through the primary coil 11 is constant. When the current flows through the primary coil 11, the magnetic flux is small because the gap distance between the plunger 2 and the armature 5 is the maximum, and the magnetic flux increases as the plunger 2 approaches the armature 5, and the plunger 2 moves to the armature 5. The magnetic flux is maximum when adsorbed.

When a sinusoidal AC voltage is applied to the primary coil 11 to pass a current, the secondary coil 12 is provided around the vertical plate portion of the yoke 13, so that the yoke operates according to the same principle as the AC transformer. Since a sinusoidal magnetic flux passes through 13 and this magnetic flux interlinks with the primary coil 11 and the secondary coil 12 to alternate, the primary coil 11 is self-inducing and the secondary coil 12 is mutual inducing. Electromotive force is induced in each of them. Each electromotive force is proportional to the magnetic flux, and the electromotive force induced in the primary coil 11 and the electromotive force induced in the secondary coil 12 are proportional to the number of turns of each coil. Therefore, since the secondary voltage induced in the secondary coil 12 changes in proportion to the magnetic flux that changes (increases) as the plunger 2 of the oil dash pot 9 approaches the armature 5, the movement amount by which the plunger 2 operates is changed. And the secondary voltage of the secondary coil 12, a constant relationship is obtained as follows.

FIG. 5 shows the operation time of the oil dash pot 9 when a primary voltage of 30 V AC is applied to the primary coil 11 and a current of 10 A is flowed, and measured at the output side of the voltage amplifier 42 shown in FIG. FIG. 4 is a relational diagram with the secondary voltage, which is (A) a good product that operates normally (hereinafter referred to as “good product”),
(B) An example of a defective product (hereinafter referred to as a sliding defective product) that does not operate properly due to slidability due to the large outer diameter of the plunger 2. (C) The plunger 2 which is a movable iron core is missing due to charging. A defective product that does not operate normally because a magnetic field is not formed in the primary coil 11 (hereinafter referred to as defective product without plunger),
(D) Defective product (hereinafter referred to as defective product without spring) and (E) braking oil 4 in which the plunger 2 is in contact with the armature 5 before the start of measurement due to the leakage of the coil spring 3 and the normal operation does not occur. Average relationship of measured data by oscillograph of defective product (hereinafter referred to as oil-free defective product) that plunger 2 sticks to armature 5 and does not operate normally in a very short time after the start of measurement due to leakage of enclosure It is a diagram.

The non-defective product of (A) rises with a secondary voltage of about 4.2 V at the start of measurement (marked with Δ), and about 12 from the start of measurement.
During the period of sec, the gap distance between the plunger 2 and the armature 5 is long, so the magnetic flux is small and the bubbles are slightly contained in the cylinder 1, so that the operation is unstable, and the operation is not started from about the start of measurement. Stable operation is continued from 12 seconds. Since the magnetic flux between the plunger 2 and the armature 5 increases in inverse proportion to the square of the gap distance between them, the secondary voltage increases with the quadratic curve shown in the figure, and about 31 seconds after the start of measurement, the plunger 2 Is attracted to the armature 5 and the operation ends at the position marked with a circle. The secondary voltage at this time is about 7.4V, and the secondary voltage after the end of operation (marked with ○) should be balanced, but the winding resistance decrease due to heating of the primary coil 11 and the secondary coil 12 Only a small amount increases until the end of measurement by oscillograph (marked with □).

The set values of the following items can be determined from the oscillograph data of the good product (A). In FIG. 5, the operation initial cut time t1 in which the high level voltage generated at the start of the test is not measured is set at an extremely short time from the start of the test because the high level voltage is instantly stabilized. In the example, the operation initial cut time t1 = 3 sec is set by the T1 timer (not shown). The measurement end time t2 for ending the measurement of the operation test for each stage is about 31 seconds from the start of the test until the plunger 2 of the oil dash pot 9 is adsorbed by the armature 5 and the operation ends. Therefore, the time may be set to exceed this time, and in this embodiment, the measurement end time t2 = 40 sec is set by the T2 timer (not shown) with a margin.

The measurement start cut voltage v1 for setting the range of unmeasured voltage in the unstable region at the initial stage of the test is about 5.1V after about 12 seconds from the start of the test and enters the stable region. The voltage difference from the initial voltage of about 4.3V at t1 = 3 sec may be set to 5.1-4.3 = 0.8V with a value with some margin, and in this embodiment, the measurement start cut voltage v1 = 1. The cut voltage setting device 21 shown in FIG. This measurement voltage vy and the previous measurement voltage vx measured at each measurement unit time Δt
And the reference voltage difference v2 for comparison calculation in the calculation unit 50 are the measured voltage difference vy at this time in the measurement unit time Δt = 0.3 sec after 25 seconds from the start of measurement.
Voltage difference Δv = 0.03V between the measured voltage vx and the previous measured voltage vx
Then, after 27.5 seconds from the start of measurement, the measured voltage difference Δv
= 0.08V, and the measured voltage difference Δv = 0.12V after 30 seconds from the start of measurement, 0.08V and 0.1
It may be set between 2V, and in this embodiment, the reference voltage difference v
2 = 0.10V is set by the reference voltage difference setter 22.

The defective sliding product (B) was measured at the start of measurement (Δ
The secondary voltage is about 4.2V, which is the same level as the non-defective product in (A).
It starts up, but the slidability is poor, so the operating speed is slow,
During a period of about 56 seconds from the start of measurement, the gap distance between the plunger 2 and the armature 5 is long, so that the magnetic flux is small and the operation is unstable due to the movement of some air bubbles contained in the cylinder 1. , Stable operation from about 56 seconds after the start of measurement, about 14 from the start of measurement
In 5 seconds, the plunger 2 is attracted to the armature 5 and the operation ends at the position marked with a circle. Since the operation time is long, the secondary voltage at this time has a higher voltage level than that of the non-defective product of (A) due to the reduction of the winding resistance due to the heating of the primary coil 11 and the secondary coil 12.

In the defective product without the plunger of (C), the plunger 2 which is the movable iron core is not inserted into the primary coil 1 due to the charging failure.
The magnetic flux due to 1 is extremely weak, and the secondary voltage is infinitely close to 0 (zero) V from the start of measurement (marked with Δ). Since it does not make sense to measure for a long time, the oscillographic measurement is completed (□) about 63 seconds after the start of measurement.

Coil spring 3 is the defective product without spring in (D).
Since the plunger 2 was in contact with the armature 5 before the measurement started due to the charging failure, and the magnetic flux between the plunger 2 and the armature 5 was in the maximum state, at the start of the measurement (marked with Δ). The secondary voltage suddenly rises at about 7.5V, and the secondary voltage slightly increases by the decrease in the winding resistance with the passage of time, but it does not make sense to measure for a long time. Ends the oscillograph measurement (□
(Marked).

The oil-free defective product of (E) has no fluid resistance due to the leakage of the braking oil 4, and the plunger 2 is adsorbed to the armature 5 in an extremely short time after the start of measurement. The voltage rises at about 7.5V, which is the same level as the springless defective product of (D), almost at the same time as the start of measurement (marked with Δ), and the secondary voltage slightly increases by the decrease in the winding resistance with the passage of time thereafter. Since it does not make sense to measure for a long time, the oscillograph measurement ends within 63 seconds from the start of measurement (marked with □).
It was made.

The measurement control system of the operation test apparatus of the present invention is made by utilizing the above-mentioned relation, and is measured as follows.

When a test start push button (not shown) is turned on, the secondary voltage of the secondary coil 12 is rectified from AC to DC by the rectifier 41 of the data measuring section 40 shown in FIG. 3 and amplified by the voltage amplifier 42. The analog switch 43 switches the data of each test unit 10 from the 1st to the 30th to each channel, the secondary voltage is converted from analog to digital by the A / D converter 44, and the data is transferred via the slot 51. Is transmitted to the calculation unit 50, but the initial cut time t of the operation is
It is not stored for 1 = 3 sec, but the initial voltage va and the initial voltage va + measurement start cut voltage v1 = measurement voltage vn data after the comparison calculation start voltage vb are stored.

For example, if the oil dashpot 9 placed on the Nath test section 10 is a good product (A), the initial voltage va + measurement start cut voltage v1 = comparison calculation start voltage vb is calculated by the calculation section 50. Calculated and stored, measurement unit time Δt = 0.3 sec from the time point of comparison calculation start voltage vb
Each time, the measured voltage vn is measured and stored in the calculation unit 50, and the measured voltage difference Δv between the current measured voltage vy and the previous measured voltage vx is repeatedly compared and calculated with the reference voltage difference v2 = 0.10V. The previous measured voltage vx is automatically erased for each comparison calculation, and the measured voltage difference Δv> reference voltage difference v2 = 0.10.
When the comparison calculation result of V is obtained, the calculation unit 50 outputs the slot 5
The OK signal is transmitted to the determination unit 60 via 1. Then, by the lamp driver (not shown) of the determination unit 60
The Na-th judgment lamp 62 provided on the display surface 19a of the control panel 19 is turned on, the measurement end lamp (not shown) is turned on by the T2 timer (not shown) after the measurement end time t2 = 40 sec from the start of the test, and the operation test is performed. Measurement is completed.

If the oil dash pot 9 mounted on the Nb-th test section 10 is a sliding defective product of (B), initial voltage va + measurement start cut voltage v1 = comparison calculation start voltage vb (illustrated) None) is calculated and stored by the calculation unit 50, but the comparison calculation start voltage vb is the measurement end time t2.
= 40 sec or later, the measurement unit time Δt
= Measurement voltage vn every 0.3 sec is the comparison calculation start voltage v
Since it is smaller than b, it is not measured and calculation becomes impossible. Since the calculation cannot be performed, the OK signal is not transmitted from the calculation unit 50 to the determination unit 60 via the slot 51, the Nb-th determination lamp 62 is not lit, and the measurement end time t2 = 40.
After sec, the measurement end lamp is turned on and the measurement of the operation test ends.

If the oil dash pot 9 mounted on the Nc-th test section 10 is a defective product without a plunger (C), the initial voltage va + the measurement start cut voltage v1 =
The comparison calculation start voltage vb (not shown) is calculated and stored by the calculation unit 50, but the initial voltage va is infinitely 0 (zero).
Since the change is close to V and the change over time is almost in the equilibrium state, the measured voltage vn at each measurement unit time Δt = 0.3 sec is smaller than the comparison calculation start voltage vb, so that measurement is not performed and calculation becomes impossible. Since the calculation cannot be performed, the OK signal is not transmitted from the calculation unit 50 to the determination unit 60 through the slot 51, the Nc-th determination lamp 62 is not turned on, and the measurement end lamp is turned on after the measurement end time t2 = 40 sec. The measurement of the operation test is completed.

If the oil dash pot 9 mounted on the Nd-th test section 10 is a defective product without spring (D), initial voltage va + measurement start cut voltage v1 = comparison calculation start voltage vb (illustrated) None) is calculated and stored by the calculation unit 50, but since the change over time after the initial voltage va is almost in equilibrium, the measurement unit time Δt = 0.3.
Since the measured voltage vn for each sec is smaller than the comparison calculation start voltage vb, the measurement is not performed and calculation becomes impossible. Since the calculation cannot be performed, the determination unit 6 passes from the calculation unit 50 through the slot 51.
No OK signal is transmitted to 0, and the Nd-th determination lamp 62
Is not lit, the measurement end lamp is lit after the measurement end time t2 = 40 sec, and the measurement of the operation test ends.

If the oil dash pot 9 mounted on the Ne-th test section 10 is a defective product without oil (E), initial voltage va + measurement start cut voltage v1 = comparison calculation start voltage vb (illustrated) None) is calculated and stored by the calculation unit 50, but like the measurement of the springless defective product in (D),
Since the change over time after the initial voltage va is almost in the equilibrium state, the measured voltage vn at each measurement unit time Δt = 0.3 sec is smaller than the comparison calculation start voltage vb, so that the measurement is not performed and calculation becomes impossible. Since the calculation cannot be performed, the OK signal is not transmitted from the calculation unit 50 to the determination unit 60 through the slot 51, the Ne-th determination lamp 62 is not turned on, and the measurement end lamp is turned on after the measurement end time t2 = 40 sec. The measurement of the operation test is completed.

After the measurement end lamps corresponding to all the first to thirtieth test sections 10 are turned on and the measurement of the operation test is completed, the judgment lamps 62 corresponding to the respective test sections 10 are turned on or After confirming non-lighting, the oil dash pot 9 of the lit test unit 10 is a good product, and the oil dash pot 9 of the non-lighted test unit 10 is determined as a defective product, and the good product and the defective product are distinguished from each other. Store it in the storage box of.

The operation test after the next stage is repeated by the above-mentioned procedure.

Subsequently, the test procedure and operation of the embodiment according to claim 3 will be described below with reference to FIGS. 3 and 4.

For example, if the oil dash pot 9 mounted on the Na-th test section 10 is a good product of (A), the comparison calculation result of measurement voltage difference Δv> reference voltage difference v2 = 0.10V. Then, an OK signal is transmitted from the calculation unit 50 shown in FIG. 3 to the lamp driver (not shown) of the determination unit 60 via the slot 51, and at the same time, to the solenoid driver (not shown) provided in the determination unit 60. The OK signal is transmitted. Then, at the same time when the Na-th determination lamp 62 is turned on, the plunger 74a of the solenoid 74 shown in FIG.
The oil dash pot 9 is moved upward via the, and the measurement end lamp (not shown) is turned on by the T2 timer (not shown) after the measurement end time t2 = 40 sec from the start of the test, and the measurement of the operation test is finished.

If the oil dash pot 9 is defective, the OK signal is not transmitted, so the oil dash pot 9 is not moved upward.

After the measurement end lamps corresponding to all the first to thirtieth test sections 10 are turned on and the measurement of the operation test is completed, the judgment lamps 62 corresponding to the respective test sections 10 are turned on and Rise of the oil dash pot 9,
Alternatively, the non-lighting of the determination lamp 62 and the non-rise of the oil dash pot 9 are confirmed, and the oil dash pot 9 of the test unit 10 that is lit and raised is a good product, and the oil dash pot of the non-lighting and non-rise test unit 10 is good. 9 is determined as a defective product, and the non-defective product and the defective product are sorted and distinguished and stored in respective storage boxes, for example.

However, when determining whether the oil dash pot 9 is a good product or a defective product, it is more accurate than the determination by only lighting or not lighting the judgment lamp 62, and the good product and the defective product are sorted and classified into respective storage boxes. It is possible to prevent mixing when storing.

In the invention described in claim 1 of the present application, for example, a pick-and-place (not shown) capable of gripping and transferring the oil dash pot 9 placed on the test section 10 and the determination section 60 are used. It is a good oil dash pot 9 in which the pick-and-place driving means (not shown) capable of driving the pick-and-place is provided, and the plunger 2 operates normally in the cylinder 1 in response to a signal from the arithmetic unit 50. It also includes an operation test device for an oil dash pot that is configured to select a non-defective product from a defective product based on the determination result of whether the oil dash pot 9 is a defective product that does not operate.

[0070]

Since the present invention is configured as described above, it has the following effects.

A yoke member made of a magnetic material formed in a U shape, a primary coil for applying a primary voltage, a secondary coil for inducing a secondary voltage, and a data measuring means for measuring the secondary voltage. The next voltage is repeatedly stored for each measurement unit time, and the calculation voltage difference between the current measurement voltage and the previous measurement voltage is compared and calculated with a preset reference voltage difference. Since it is provided with a judging means for displaying a judgment result as to whether it is a good oil dash pot that operates or a defective oil dash pot that does not operate normally, a large number of oil dash pots are configured. It is possible to carry out an operation test by mounting the device, reduce dead time such as waiting for an operation test, and improve work efficiency.

Since the voltage level and time measured by this device can be determined from the relationship diagram of the voltage and time at which the oil dashpot is operated by the current passed through the primary coil, the current value to the primary coil can be determined. It is possible to perform an operation test in a short time by increasing the number of turns of the primary coil or increasing the number of turns of the primary coil, thereby improving work efficiency.

Further, the result of the judgment by the judging means is such that the lamp is turned on or off only for the oil dash pot judged to be good or defective, or only the oil dash pot judged to be good or defective is used. Since it was moved upward to identify, there is no need for the operator to read the numerical data and compare it with the standard to make a determination.
This has an effect that it is difficult for a good product and a defective product to be mixed due to misunderstanding by an operator.

Furthermore, a pick-and-place (not shown) capable of gripping and transferring the oil dash pot placed on the test section and a pick-and-place driving means (not shown) capable of driving the pick-and-place to the judging means are provided. According to the signal from the calculation means, a good oil dash pot that normally operates, or a defective oil dash pot that does not work normally is selected. Since it can be configured as described above, there is an effect that a good product and a defective product are not mixed due to misunderstanding by an operator.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a test part of an example according to the present invention.

FIG. 2 is a side view showing the overall configuration of the embodiment according to the present invention.

FIG. 3 is a block diagram showing a control system of an embodiment according to the present invention.

FIG. 4 is a partial sectional view showing a test section according to claim 3 of the embodiment according to the present invention.

FIG. 5 is a relational diagram of the operating time of the oil dashpot and the secondary voltage according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an actuator unit that shuts off an overcurrent of an overcurrent breaker.

FIG. 7 is an explanatory diagram of an operation test device for an oil dash pot according to a conventional technique.

[Explanation of symbols]

 [Symbols related to the invention of the present application] 2 Plunger 5 Armature 9 Oil dashpot 10 Test part 11 Primary coil 12 Secondary coil 13 Yoke 20 Setting part 30 Measurement start input part 40 Data measuring part 50 Calculation part 60 Judgment part 70 Test part 73 yoke 74 solenoid [symbol relating to overcurrent breaker] 81 exciting coil 83 yoke 87 hinge [symbol relating to prior art] 91 exciting coil 93 yoke 93b salient 97 hinge 98 micro switch

Claims (3)

[Claims] 1. An operation test device for an oil dash pot used for an actuator mechanism of an overcurrent circuit breaker, wherein an insertion hole is formed in an upper plate portion formed in a U shape so that the oil dash pot can be inserted therethrough. A yoke member of a magnetic body on which the oil dash pot can be placed with the armature at the lower end on the upper surface of the lower plate portion that is formed in a U shape, and the oil dash pot that is placed on the yoke member. A primary coil provided in a cylindrical shape around which a primary voltage of a sine wave alternating current is applied, and a sine wave alternating current applied to the primary coil provided around a U-shaped vertical plate portion of the yoke member. Secondary coil in which a secondary voltage of sinusoidal alternating current is induced by the primary voltage of the secondary coil, and data measuring means for measuring the secondary voltage of sinusoidal alternating current induced in the secondary coil by rectification, amplification, digital conversion, etc. When Calculating means for repeatedly storing the secondary voltage measured by the data measuring means for each measuring unit time and comparing the measured voltage difference between the present measured voltage and the previously measured voltage with a preset reference voltage difference And a good oil dash pot in which the plunger normally operates in the cylinder in response to a signal from the arithmetic means, or
An operation test device for an oil dash pot, comprising: a determination means for displaying a determination result as to whether the oil dash pot is a defective product that does not operate normally. 2. The determination result of a good oil dash pot that normally operates and a defective oil dash pot that does not operate normally by the determination means is lamped only for an oil dash pot that is determined to be good or defective. The operation test device for an oil dash pot according to claim 1, wherein the light is turned on or off for identification. 3. The determination result of a good oil dash pot that operates normally and a defective oil dash pot that does not operate normally by the determination means is moved upward only for the oil dash pot that is determined to be good or defective. The operation test device for an oil dash pot according to claim 1 or 2, wherein the operation test device is used for identification.