JP4243771B2 - Fault diagnosis device for electrical equipment due to power supply voltage abnormality - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a failure diagnosis apparatus for preliminarily diagnosing a failure caused by an abnormality of a power supply voltage in an electrical facility operated by AC power.
[0002]
[Prior art]
In a system that supplies power in parallel with a commercial power source and a private power generator, if a power failure occurs in the commercial power source, the private power generator is overloaded and stopped, so all electrical devices that are loads are also stopped.
[0003]
On the other hand, when the commercial power supply stops for some reason (for example, an instantaneous power outage of about several seconds), it immediately recovers and continues to supply power. Depending on the electrical equipment, a failure may occur or the operation may stop.
[0004]
From such a situation, when a commercial power supply fails, there is a demand for a method of continuously feeding power with a private generator.
However, such continuous power supply by a private generator is overloaded as described above, and the power supply voltage decreases, so it is not possible to supply power to all electrical equipment. A system for supplying power continuously has been proposed.
[0005]
Specifically, commercial power supply blackouts are detected at high speed, and based on this detection, the power supply system of the private power generator is disconnected from the power supply system of the commercial power supply, an important load is selected, and this important load is continued by the private power generator. Supply power.
[0006]
[Problems to be solved by the invention]
In the present invention, when a commercial power supply is stopped, a pseudo abnormal voltage is preliminarily applied to the important load so that the important load continuously fed by the private generator does not interfere with the fluctuation of the power supply voltage as described above. A fault diagnosis apparatus is proposed that is used to simulate whether or not a fault occurs due to the application of.
[0007]
However, the fault diagnosis apparatus of the present invention is used for testing and researching and inspecting various fluctuations in the power supply voltage even in the case of testing and researching AC electrical equipment such as electrical equipment. be able to.
[0008]
As described above, the present invention can variously change the power supply voltage of electrical equipment such as electrical equipment operated by AC power to diagnose whether or not a fault occurs in the electrical equipment, and supply large power. It is an object of the present invention to provide a fault diagnosis apparatus that can be easily used for a load and that can reduce the cost of the apparatus.
[0009]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention relates to a failure diagnosis apparatus for preliminarily diagnosing a failure that occurs due to an abnormality of a power supply voltage in an electrical facility operated by AC power.
[0010]
The failure diagnosis apparatus according to the first aspect of the present invention includes an abnormal voltage generation means comprising an AC-AC inverter circuit that is provided in a power supply voltage power supply line of an electrical facility and outputs a pseudo abnormal voltage, and various abnormality predictions of the power supply voltage. An information setting means for setting information, and a control means for outputting a pulse control signal corresponding to the abnormality prediction information set by the information setting means . The abnormal voltage generating means is operated by the pulse control signal to generate an abnormal voltage. It is configured to output .
[0011]
According to a second aspect of the present invention , there is provided a fault diagnosis apparatus comprising: an abnormal voltage generating means comprising a linear amplifier that is provided in a power supply voltage supply line of an electrical facility and outputs a pseudo abnormal voltage; and information for setting various types of abnormality prediction information of the power supply voltage The abnormal voltage generating means , comprising: a setting means; and a control means that includes a modulation circuit that amplitude-modulates the AC reference voltage based on the abnormality prediction information set by the information setting means , and outputs a modulation signal of the AC reference voltage as a control signal. Is operated by the control signal to output an abnormal voltage .
[0016]
[Action]
An increase or decrease in the voltage value of the power supply voltage, a voltage disappearance, the occurrence point of an abnormal voltage, the length of an abnormal voltage time, or the like is predicted, and this prediction information is set as abnormality prediction information by the information setting means.
[0017]
The abnormality prediction information set in this way is output from the control means as a control signal corresponding to the prediction information, and the abnormal voltage generation means operates by inputting this control signal.
[0018]
That is, the normal power supply voltage applied from the power supply line is changed according to the abnormality prediction information and applied to the electrical equipment by the operation of the abnormal voltage generating means.
As a result, it is possible to diagnose whether or not trouble is caused by the abnormal power supply voltage predicted by the electrical equipment.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an electric circuit diagram of a failure diagnosis device that diagnoses a failure in a load (electric equipment such as an electric device) operated by three-phase alternating current.
[0020]
As shown in the figure, this fault diagnosis apparatus has an AC power supply (200 V, 50/60 Hz) connected to each terminal U, V, W of one terminal base 10a and the other terminal base 10b. Power is supplied to each load (not shown) connected to each terminal u1, v1, w1, u2, v2, and w2.
The terminal of the terminal base 10b can be increased or decreased according to the number of loads.
[0021]
An abnormal voltage generator 12U, 12V, 12W is connected to each of the three-phase power supply lines 11U, 11V, 11W, and each output voltage of the abnormal voltage generator is changed to a three-phase compound winding transformer (for example, Δ-Y It is applied to each load via a connection transformer 13.
The three-phase compound winding transformer 13 is not necessarily required.
The circuit breaker 14a is provided on the terminal base 10a side, and the circuit breakers 14b and 14c are provided on the terminal base 10b side.
[0022]
The abnormal voltage generators 12U, 12V, and 12W described above are configured by a switching circuit including a filter circuit, and are a kind of AC switching regulator that outputs an abnormal voltage in response to a pulse control signal Po sent from the controller 15. It has become.
[0023]
On the other hand, the information setting unit 16 sets various abnormal information of the power supply voltage, predicts an abnormal voltage of the power supply voltage at which the load causes a failure, and sets the abnormal prediction information.
For example, an instantaneous power failure, power failure, voltage fluctuation, etc. that actually occur are predicted, and the prediction information is set.
[0024]
The abnormality prediction information set as described above is patterned by the setting information output unit 17 and sent to the control unit 15 as a pattern signal So.
The setting information output unit 17 is a signal processing circuit including a CPU and its peripheral devices in order to change the operation mode (manual, automatic, instantaneous interruption) in addition to patterning the abnormality prediction information. It has become.
[0025]
The control unit 15 includes a pulse width modulation circuit that performs pulse conversion on the pattern signal So and performs pulse width modulation, and outputs the pulse control signal Po as described above.
[0026]
1 is a pilot lamp, 19 is a voltmeter, and 20 is an ammeter.
Further, this fault diagnosis apparatus is provided with an AC / DC converter 21 that converts three-phase alternating current into direct current, and a power supply voltage state is displayed by a display (not shown) connected to the AC / DC converter 21.
[0027]
Next, each circuit unit will be described in some detail.
FIG. 2 shows the operation panel 22 provided in the information setting unit 16 described above.
The operation panel 22 is configured to be optically projected by an optical display, and the illustrated state shows a display screen displayed in an automatic mode.
A similar operation panel is also displayed in the instantaneous power failure mode, but in this case, a display screen for setting T1 and T3 in units of ms (milliseconds) is displayed.
[0028]
As shown in the figure, the fault diagnosis apparatus of the present embodiment can select one of the operation modes of manual, automatic, and instantaneous interruption, and sets the normal voltage V1 and abnormal voltage V2, and the three-stage time T1. , T2, and T3 can be set.
In the manual mode, V1 and V2 are set by a manual setting device.
[0029]
In this embodiment, when the automatic mode is selected, both V1 and V2 are set within the range of 0 to 220 V, and T1, T2 and T3 are set within the range of 1.0 to 99.9 s (seconds). Can do.
When the instantaneous power failure mode is selected, V1 is 0 to 220 V, V2 is 50% to V1 of V1, T1 is 20 to 999 ms (milliseconds), T2 is 0 to 9.99 s (seconds), and T3 is 100. It can be set in a range of ˜999 ms (milliseconds).
[0030]
When the automatic mode is selected by the operation panel 22 and abnormality prediction information is set by V1, V2, T1, T2, and T3, the abnormality prediction information is input to the setting information output unit 17, and the setting information The output unit 17 outputs the pattern signal So shown in FIG.
[0031]
When the “ON” button on the operation panel 22 is pressed, the setting information output unit 17 softens up to V1, and then starts the information processing by operating the “START” button. FIG. The pattern signal So shown in FIG.
The setting information output unit 17 stops its operation by reselecting the operation mode.
[0032]
Then, the pattern signal So described above is input to the control unit 15 and is subjected to pulse conversion and pulse width modulation by the pulse width modulation circuit provided in the control unit 15, and the pulse control signal shown in FIG. Output as Po.
[0033]
FIG. 4 is a circuit block diagram illustrating an example of the control unit 15.
Although only the abnormal voltage generation unit 12U is shown in the drawing, the other abnormal voltage generation units 12V and 12W have the same configuration.
As shown in the figure, the control unit 15 includes a feedback circuit 15c including a comparison amplifier 15a, a pulse width conversion circuit 15b, and an AC / DC conversion circuit. The pattern signal So and the feedback signal P1 Are compared with each other by a comparison amplifier 15a, and the amplified signal S1 is subjected to pulse width modulation by a pulse width modulation circuit 15b to output a pulse control signal Po.
[0034]
The pulse width modulation performed by the control unit 15 is a width modulation in which the pulse width is increased as the level of the pattern signal So is increased, and the pulse width is decreased as the level is decreased. (See Fig. 3 (b))
[0035]
The abnormal voltage generators 12U, 12V, and 12W that respond to the pulse control signal Po input an AC voltage with a frequency of 50/60 Hz from an AC power supply, switch the AC voltage according to the pulse control signal Po, and output an abnormal voltage. .
[0036]
Specifically, the abnormal voltage generators 12U, 12V, and 12W input a sine wave AC voltage Vo1 as shown in FIG. 5A, and the AC voltage Vo1 is input to the AC voltage Vo1 according to the pulse control signal Po as shown in FIG. Switching as shown in b).
The waveform is shaped by a filter circuit provided in the abnormal voltage generation unit, and an alternating voltage (abnormal voltage) Vo2 having an amplitude changed as shown in FIG. 5C is output.
[0037]
Next, the operation of the above fault diagnosis apparatus will be described.
As described above, after selecting the operation mode by the operation panel 22 and setting the abnormality prediction information by V1, V2, T1, T2, and T3, first, the “ON” button is operated, and then “ By operating the “START” button, the abnormal voltage generation units 12U, 12V, and 12W perform an output operation.
[0038]
FIG. 6B is a waveform diagram showing an example of an abnormal voltage output in the automatic mode.
In this output operation example, V1 = 200V, V2 = 100V, and T1 = T2 = T3 = 1S are set as abnormality prediction information.
When the abnormality prediction information is set in this way, the setting information output unit 17 outputs the pattern signal So shown in FIG.
[0039]
Thus, since the control unit 15 operates the abnormal voltage generation units 12U, 12V, and 12W with the pulse control signal Po corresponding to the pattern signal So, each abnormal voltage generation unit generates a normal AC voltage in a pseudo manner. Instead, an abnormal voltage as shown in FIG.
[0040]
The abnormal voltage output in this way is supplied to the load via the three-phase compound winding transformer 13 and subjected to a simulation test.
As a result, when the fluctuation of the power supply voltage of 100 V occurs for 1 second, it can be diagnosed whether the 200 V power supply load operates normally or causes a failure.
The power supply voltage at this time can be confirmed by a display connected to the AC / DC converter 21.
In case of an emergency stop, remove the circuit breaker.
[0041]
FIG. 7 is a waveform diagram showing an example of output operation when V1 = 200 V, V2 = 0 V, and T1 = T2 = T3 = 1S in the automatic mode similar to the above.
As described above, since the output voltage of the abnormal voltage generators 12U, 12V, and 12W changes variously according to the setting of the abnormality prediction information, the operation of the load is performed by applying such an abnormal voltage to the load as a power supply voltage. The condition can be diagnosed.
[0042]
FIG. 8B is a waveform diagram showing an example of an abnormal voltage output by selecting the instantaneous power interruption mode.
This waveform diagram is an output operation example in which abnormality prediction information of V1 = 200 V, V2 = 100 V, T1 = 20 ms, T2 = 0 s, T3 = 100 ms is set on the operation panel in the instantaneous power failure mode.
[0043]
When the abnormality prediction information (instantaneous power interruption information) is set in this way, the setting information output unit 17 outputs the pattern signal So shown in FIG. A pseudo alternating voltage is changed to a power supply voltage for a momentary power failure, and the voltage for the momentary power failure is applied to a load.
As a result, it is possible to diagnose whether the load operates without any trouble in the momentary power failure or whether any trouble occurs.
[0044]
As can be seen from the above, it is possible to simulate the operational state of electrical equipment due to abnormal power supply voltage, so it is possible to select important loads to be supplied by private power generators in the event of a momentary power failure or power failure. Therefore, it is effective as a test apparatus used for the purpose.
[0045]
In addition, it can be used regardless of the high- and low-power loads, so it can be used as a fault diagnosis device for testing, research, and inspection in research institutions of universities and companies, electrical equipment, electrical parts production factories, etc. be able to.
[0046]
Next, another embodiment will be described.
FIG. 9 is a circuit block diagram showing an embodiment in which the abnormal voltage generators 12U, 12V, and 12W are configured by AC-AC inverter circuits.
Although only the abnormal voltage generation unit 12U is shown in the drawing, the other abnormal voltage generation units 12V and 12W have the same configuration.
[0047]
The abnormal voltage generation unit 12U according to this embodiment is configured to input and output an AC voltage from a commercial power supply, rectify and smooth the rectifying circuit 31 and the input smoothing circuit 32, and switch the rectified and smoothed power supply voltage according to the control signal Po to output a pulse. And a switching circuit 33 for smoothing the pulse output voltage and an output smoothing circuit 34 for outputting a pseudo abnormal voltage.
[0048]
Further, the control unit 15 of this embodiment detects an output voltage, an amplitude modulation circuit 36 that modulates the AC voltage output from the reference waveform output circuit 35 by the pattern signal So output from the setting information output unit 17. The feedback circuit 37 for feedback, the amplitude modulation voltage and the feedback voltage are input, the differential amplifier 38 for output according to the difference voltage, and the output signal of the differential amplifier 38 is pulse-modulated, and pulse control is performed. A pulse modulation circuit 39 that outputs a signal Po is included.
[0049]
In the failure diagnosis apparatus of this embodiment, if the abnormality prediction information is set by the information setting unit 16 as described above, the setting information output unit 17 patterns the abnormality prediction information set, and the pattern signal Output So.
[0050]
Thus, the AC reference voltage is amplitude-modulated by the pattern signal So, and the differential amplifier 38 that inputs the amplitude-modulated voltage and the feedback voltage outputs these differential voltage signals, and the differential voltage signal is pulsed. The pulse is converted and modulated by the modulation circuit 39.
[0051]
Since the switching circuit 33 operates according to the pulse control signal Po output from the pulse modulation circuit 39, the output voltage of the AC-AC inverter circuit changes according to the abnormality prediction information.
As a result, the abnormal voltage generation unit 12U including the AC-AC inverter circuit outputs a pseudo abnormal voltage, and this abnormal voltage is applied to the load.
[0052]
FIG. 10 is a circuit block diagram showing an embodiment in which the abnormal voltage generation units 12U, 12V, and 12W are configured by linear amplifier circuits.
Although only the abnormal voltage generation unit 12U is shown in the drawing, the other abnormal voltage generation units 12V and 12W have the same configuration.
[0053]
The abnormal voltage unit 12U of this embodiment includes a rectifying circuit 41, an input smoothing circuit 42, and an output amplifier 43 that receive and rectify and smooth an AC voltage from a commercial power source.
[0054]
The control unit 15 of this embodiment includes a reference waveform output circuit 44, an amplitude modulation circuit 45, a feedback circuit 46, and a differential amplifier 47.
That is, the control unit 15 has a circuit configuration in which the pulse modulation circuit 39 shown in FIG. 9 is removed.
[0055]
In the fault diagnosis apparatus of this embodiment, the output signal of the differential amplifier 47 is input to the output amplifier 43 as the control signal Po, and a pseudo abnormal voltage is output from the output amplifier 43.
Other circuit section operations are the same as those in the embodiment of FIG.
[0056]
As described above, the fault diagnosis apparatus of the present invention has an AC-AC inverter circuit (FIG. 9).
Can also be implemented using a linear amplifier circuit (FIG. 10), and in the same way as the fault diagnosis apparatus shown in FIG. Can do.
[0057]
In addition, this invention can be implemented similarly not only about the electrical equipment of a three-phase alternating current power supply but the electrical equipment of a single phase alternating current power supply.
[0058]
【The invention's effect】
As described above, the fault diagnosis device of the present invention predicts various abnormal changes in the power supply voltage and is configured to feed the load by changing the power supply voltage in a pseudo manner according to the abnormality prediction information. It is possible to easily diagnose a failure in the electrical equipment (load) that occurs.
[0059]
For example, it is possible to diagnose in advance a failure of electrical equipment caused by the occurrence of an instantaneous power failure of a commercial power supply or the generation of a three-phase unbalanced voltage, and to prevent the failure beforehand.
[0060]
In addition, since the fault diagnosis apparatus according to the present invention can be configured by an electric circuit, it is advantageous in reducing the manufacturing cost as well as reducing the size and weight.
[Brief description of the drawings]
FIG. 1 is an electric circuit diagram of a failure diagnosis apparatus showing an embodiment of the present invention.
FIG. 2 is a front view of an operation panel provided in the failure diagnosis apparatus.
3A is a pattern signal output from a setting information output unit provided in the failure diagnosis apparatus, and FIG. 3B is a pulse control output from a control unit provided in the failure diagnosis apparatus. It is a wave form diagram which shows each signal.
FIG. 4 is a circuit block diagram illustrating an example of a control unit provided in the failure diagnosis apparatus.
FIGS. 5A, 5B, and 5C are waveform diagrams for explaining the operation of the abnormal voltage generation unit provided in the failure diagnosis apparatus. FIG.
FIGS. 6A and 6B are waveform diagrams showing an example of output operation in the automatic mode of the failure diagnosis apparatus.
7 is a waveform diagram similar to FIG. 6 showing another output operation example.
FIGS. 8A and 8B are waveform diagrams showing an example of an output operation in the instantaneous power failure mode of the failure diagnosis apparatus.
FIG. 9 is a circuit block diagram of a fault diagnosis apparatus showing an embodiment using an AC-AC inverter circuit.
FIG. 10 is a circuit block diagram of a failure diagnosis apparatus showing an embodiment using a linear amplifier circuit.
[Explanation of symbols]
12U, 12V, 12W Abnormal voltage generation unit 13 Three-phase compound winding transformer 15 Control unit 16 Information setting unit 17 Setting information output unit 22 Operation panel

Claims (2)

An AC-AC inverter that is provided in a power supply voltage power supply line of an electrical facility and outputs a pseudo abnormal voltage in a failure diagnosis device for preliminarily diagnosing a failure that occurs due to a power supply voltage abnormality in an electrical facility that is operated by AC power An abnormal voltage generating means comprising a circuit, information setting means for setting various abnormal prediction information of the power supply voltage, and a control means for outputting a pulse control signal corresponding to the abnormal prediction information set by the information setting means , the abnormal voltage generator failure diagnosis apparatus for electrical equipment according to the abnormal power supply voltage, characterized in that it has a configuration to output an abnormal voltage is operated by the pulse control signal. In fault diagnosis apparatus for pre-diagnose a disorder electrical equipment to be operated for generating the abnormality of the power supply voltage by the AC power, provided to the power supply voltage feed line for electrical equipment, consisting of a linear amplifier to output a pseudo abnormal voltage An abnormal voltage generating means, an information setting means for setting various abnormal prediction information of the power supply voltage, and a modulation circuit for amplitude-modulating the alternating current reference voltage by the abnormal prediction information set by the information setting means, and modulating the alternating current reference voltage and control means for outputting a signal as the control signal, the abnormal voltage generator failure diagnosis apparatus for electrical equipment according to the abnormal power supply voltage, characterized in that it has a configuration to output an abnormal voltage is operated by the control signal.

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