JP2000019211A - Leak detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a leak detector for electric apparatus having a zero-phase current detector in which safety is enhanced by recognizing an abnormality, e.g. failure, of a leak detecting means automatically and eliminating the need of a user for checking abnormality periodically thereby preventing an abnormality from being unnoticed. SOLUTION: A commercial power supply 10 and a load unit 5 are connected through a power supply switching means 6 and a current is fed from a current generating circuit 7 to only one pole of on the primary of a zero-phase current transformer 1. Output from a leak detecting circuit 3 having the zero-phase current transformer 1 is fed to a control means 4. The control means 4 makes a decision whether the leak detecting circuit 3 is abnormal or not based on the output therefrom when a current is fed thereto from the current generating circuit 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leakage detecting device having a zero-phase current transformer and detecting leakage of electric equipment.

[0002]

2. Description of the Related Art Conventionally, this type of leakage detection device has an abnormality diagnosis function. This abnormality diagnosis is performed by using a test switch composed of a mechanical switch or the like mounted in advance on the leakage detection device. When the switch is pressed, the current is forced to flow through only the primary pole of the zero-phase current transformer that constitutes the leakage detector through the contact of the test switch, and the output voltage of the zero-phase current transformer is compared with a comparator or the like. The detection is performed by the configured control unit, and when the predetermined voltage is exceeded, it is confirmed whether the control unit opens the power supply opening / closing means such as the breaker.

[0003]

However, in such a conventional earth leakage detecting device, even if the earth leakage detecting device is out of order, the abnormality of the earth leakage detecting device is diagnosed unless the user presses a mechanical switch. If the user forgets to perform abnormality diagnosis, even if the load device is leaked, the leak detection device is broken and the fault cannot be cut off. Had a problem.

[0004] Further, there is also a problem that the load device operates even if the leakage detection device fails and the leakage cannot be detected.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The present invention makes it possible to automatically confirm an abnormality such as a failure of a leakage detecting means, and eliminates the need for a user to periodically confirm the abnormality, thereby eliminating a failure. The aim is to improve safety by eliminating any unnoticed things.

[0006]

According to the present invention, in order to achieve the above object, a commercial power supply and a load device are connected by a power supply switching means, and one pole on a primary side of a zero-phase current transformer is connected by a current generating means. And the output of the leakage detecting means having the zero-phase current transformer is input to the control means. The control means is configured to determine an abnormality of the leak detecting means based on an output of the leak detecting means when the current is supplied by the current generating means.

As a result, an abnormality such as a failure of the leakage detecting means can be automatically confirmed, so that the user does not need to periodically confirm the abnormality, and the user does not notice even if the failure occurs, and the safety is ensured. Performance can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a commercial power supply, a power supply switching means for connecting the commercial power supply to a load device, a leakage detecting means having a zero-phase current transformer,
A current generating means for flowing a current only to one pole on the primary side of the zero-phase current transformer; and a control means for inputting an output of the leakage detecting means, wherein the control means Is configured to determine the abnormality of the leakage detecting means based on the output of the leakage detecting means when the power is supplied, and it is possible to automatically confirm the abnormality such as the failure of the leakage detecting means, and It is no longer necessary to check the abnormality of the electric leakage detecting device with a mechanical switch, so that even if a failure occurs, it is not noticed and safety can be improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the control means determines an abnormality of the short-circuit detecting means based on an output of the short-circuit detecting means when a current is supplied by the current generating means. Perform, if abnormal, stop the operation of the load device thereafter, if not abnormal, configured to continue the operation of the load device thereafter,
If the leakage detection means fails and the leakage cannot be detected, the power supply to the load device will be stopped, and it is possible to prevent the user from being electrically shocked by the leakage of the load device,
Safety can be improved.

According to a third aspect of the present invention, in accordance with the first or second aspect of the present invention, there is provided a notifying means for performing a notifying operation, and the control means performs an abnormality judgment of the leakage detecting means,
In the case of an abnormality, the notification unit notifies the abnormality of the leakage detection unit and stops the operation of the load device thereafter, so that the user confirms that the leakage detection is impossible. It is possible to prompt repair or replacement, and to stop the operation of the load device when leakage detection is not possible, preventing the user from being electrically shocked by leakage of the load device. , Safety can be improved.

[0011] The invention described in claim 4 is the above-mentioned claim 1-
In the invention described in Item 3, the control means is configured to perform an abnormality determination at the start of operation of the load device based on an output of the leakage detection means when a current is supplied by the current generation means. It is possible to reliably confirm the failure of the electric leakage detection means beforehand, and to prevent the user from receiving an electric shock due to the electric leakage of the load device due to the failure of the electric leakage detection means, thereby improving safety. Can be.

[0012] The invention described in claim 5 is the above-mentioned invention.
In the invention described in Item 3, the control means is configured to perform an abnormality determination based on the output of the leakage detection means when the current is supplied by the current generation means when the power is turned on. An abnormality of the detecting means can be confirmed, and the user can be prevented from being electrocuted due to the electric leakage of the load device due to the failure of the electric leakage detecting means, thereby improving safety.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) As shown in FIG. 1, a zero-phase current transformer 1 normally has a secondary current transformer according to a difference between currents flowing through two-pole windings on the primary side, as shown in FIG. The voltage is output to the side, and the current difference and the output voltage are approximately proportional. Note that the output voltage at this time changes according to the load resistance value connected in parallel to the secondary winding.

The determination unit 2 is composed of a comparator, a one-shot multivibrator, or the like. When the output voltage of the zero-phase current transformer 1 is lower than a predetermined value, it outputs high, and when it exceeds a predetermined value, it outputs low for a certain period. I do. The zero-phase current transformer 1 and the determination unit 2 constitute a leakage detection circuit (leak detection means) 3.

The control means 4 comprises a microcomputer or the like, detects that the output of the determination section 2 is low, determines that a leakage current is flowing through the load device 5 (leakage), and Is stopped, and the power opening / closing means 6 is opened. Although the power supply opening / closing means 6 is constituted by a relay in the present embodiment, it is not particularly limited, and may be constituted by a bidirectional thyristor, a mechanical switch, or the like.

The current generating circuit (current generating means) 7 comprises a series circuit of a resistor 8 and a switching element 9. In this embodiment, the switching element 9 uses a phototriac, but is not particularly limited, and may be another semiconductor element, a relay, or the like. Further, both ends of the current generating circuit 7 are connected to both ends of the commercial power supply 10 so that current flows through only one pole on the primary side of the zero-phase current transformer 1.

In the circuit configuration of the present embodiment, the power supply switching means 6 cuts off the current path by opening only one pole of the commercial power supply 10, and stops supplying power to the load device 5. However, the present invention is not limited to this, and a configuration in which both poles of the commercial power supply 10 are opened may be employed.

The operation at the time of leakage detection in the above configuration will be described with reference to FIG. 3A and 3B show waveforms of respective parts at the time of leakage detection, and FIG. 3A shows a difference between currents flowing through two-pole windings on the primary side of the zero-phase current transformer 1, that is, a leakage current. Note that the leakage current does not always have a waveform as shown in FIG. 3A but various waveforms depending on the configuration of the load device 5. In the present embodiment, description will be made using a typical leakage current waveform. I will do it. 3B is an output voltage waveform of the zero-phase current transformer 1, FIG. 3C is an output voltage waveform of the determination unit 2, FIG. 3D is an on / off command to the load device 5, and FIG. Is a command to open / close the power supply opening / closing means 6.

When a leakage current flows due to the load device 5 being immersed in water or the like, a current difference is generated between the two-pole windings on the primary side of the zero-phase current transformer 1 as shown in FIG. As shown in FIG. 3 (b), a voltage waveform corresponding to the waveform of FIG. 3 (a) is output to the secondary winding. When the side winding voltage waveform exceeds a predetermined value Vs or -Vs, a low is output for a certain period. At this time, the difference between the two primary-side currents is Is or -Is.

Generally, in the earth leakage detection, a judgment unit 2 is provided with a counter or the like in order to prevent a malfunction due to a lightning surge, and the earth leakage is detected when the voltage of the secondary winding exceeds a predetermined value several times. Is often determined, but the present invention is not particularly limited to this. In this embodiment, when the secondary winding voltage waveform exceeds the predetermined value twice, the determination unit 2 determines that the leakage has occurred as shown in FIG. 3C, and outputs a low level for a predetermined period Ts1. are doing.

The microcomputer constituting the control means 4 detects the low output of the judging section 2 and thereafter, for a predetermined period T
If the output is low during s2, it is determined that a short circuit has occurred, and an OFF command is output as shown in FIG. 3D so that the operation of the load device 5 is stopped first. Thereafter, as shown in FIG. 3 (e), when a predetermined period Ts3 has elapsed, the power supply opening / closing means 6 is opened, and the power supply to the load device 5 is stopped.

As described above, when a leakage current occurs in the load device 5, a difference occurs in the current flowing in the two-pole winding on the primary side of the zero-phase current transformer 1, and according to the current difference, The determination unit 2 detects the generation of the secondary-side output voltage of the zero-phase current transformer 1 and outputs the generated voltage to the control unit 4, so that the control unit 4 detects the leakage,
The power supply to the load device 5 is stopped by opening the power supply opening / closing means 6, and leakage current is prevented from flowing.

Next, the control means 4 is configured to judge an abnormality of the leakage detecting circuit 3 based on an output of the leakage detecting circuit 3 when a current is supplied by the current generating circuit 7.

An example of test control of the leakage detection circuit for determining whether or not the leakage detection circuit 3 is abnormal will be described with reference to FIGS. 4 and 5.

FIG. 5 is a time chart of the test control of the leakage detection circuit. FIG. 5 (a) shows the waveform of the on / off signal of the switching element 9, and FIG. 5 (b) shows the waveform of the current flowing through the resistor 8 and the zero-phase current transformer 1. This is the difference between the currents flowing through the two primary poles. FIG.
(c) is an output voltage waveform on the secondary side of the zero-phase current transformer 1. FIG. 5D shows the output voltage waveform of the determination unit 2, that is, the output voltage waveform of the leakage detection circuit 3.

When the test control of the leakage detection circuit is started in step 21 shown in FIG. 4, the control means 4 turns on the switching element 9 in step 22. When the switching element 9 is turned on, the resistor 8 is energized, and the voltage of the commercial power supply 10 is
5b, the current value divided by the value of 流 れ る flows through only one pole of the primary winding of the zero-phase current transformer 1 between the two poles on the primary side of the zero-phase current transformer 1 as shown in FIG. 5c, a voltage as shown in FIG. 5C is output to the secondary side of the zero-phase current transformer 1 according to the current value.
Here, if the leakage detection circuit 3 is normal, FIG.
As described above, the determination unit 2 outputs a low signal for a predetermined period Ts1.

In step 23, the control means 4 detects whether the output of the judgment section 2, that is, the output of the electric leakage detection circuit 3 is low. If the judgment unit 2 outputs a low signal, step 2
In step 4, it is determined that the leakage detection circuit 3 is normal, and
In step 5, the switching element 9 is turned off. In step 26, when the low output of the leakage detection circuit 3 becomes high, the leakage detection circuit test control ends.

Here, the leak detection circuit test control in step 26 is terminated when the output of the leak detection circuit 3 returns from low to high. However, the present invention is not limited to this. The process may be terminated after a predetermined time Ts6 elapses after turning off the switch 9.

If the judging section 2 does not output low for the predetermined period Ts4, it is judged in step 27 that the leakage detecting circuit 3 is abnormal, the switching element 9 is turned off in step 28, and the power is turned on and off in step 29. The means 6 is turned off, and the power supply to the load device 5 is stopped.

In the present embodiment, the leakage of the load device 5 is always detected during a period other than the leakage detection circuit test control.

As described above, by providing the current generation circuit 7 and the leakage detection circuit test control, it is possible to easily confirm whether the leakage detection circuit 3 is abnormal, and does not perform the leakage detection circuit test control. By not supplying power to the load device 5 as far as possible, it is possible to realize a leak detection device safer for the user.

(Embodiment 2) Next, an electric washing machine provided with a leakage detecting device will be described with reference to FIG.
The same components as those in the first embodiment are denoted by the same reference numerals, and the description is omitted.

In FIG. 6, a water supply valve 31, a drain valve 32,
The clutch 33, the water supply pump 34, and the like constitute a load, and the photo thyristors 35, 36, 37, 38, respectively.
Is driving through. However, the photo thyristor 35
The elements 38 to 38 are not limited, and may be other semiconductor elements or relays as long as they can drive the loads.

The diode bridge 39, the electrolytic capacitors 40 and 41 and the relay 42 constitute a voltage doubler rectifier circuit.
3 is supplied with electric power. In this embodiment, the relay 42 is connected in series to the electrolytic capacitor 40. However, the voltage doubler rectifier is not limited to this.
You don't have to.

The inverter 43 is composed of six IGBTs and switching elements composed of reverse connection diodes. However, the switching elements constituting the inverter 43 are not limited to this, and
The circuit configuration of 3 is not limited to the three-phase six-stone structure, but may be, for example, a three-phase three-structure structure.

The electric motor 44 connects each of the input terminals U, V, W to the corresponding output terminal of the inverter 43, and is rotated by being supplied with power from the inverter 43. In the present embodiment, the motor 44 is a DC brushless motor in order to increase the efficiency. However, the motor 44 is not particularly limited, and may be an induction motor. It does not matter.

The control means 45 includes the photo thyristors 35 to
38, controls the inverter 43 and also controls the power switching means 6 and the current generating circuit 7. The operation unit 46 is composed of several switches. The user outputs a signal to the control unit 45 by pressing these switches, and the control unit 45 performs an operation corresponding to the output signal. I have. In addition, the notifying unit 47 notifies the remaining time of the washing, the operation time, or when an abnormality occurs in the electric washing machine, by using a light emitting diode and a buzzer.

As described above, in the electric washing machine shown in FIG. 6, the water supply valve 31, the drain valve 32, the clutch 33, the water supply pump 34, the photo triacs 35 to 38, the diode bridge 39, the electrolytic capacitors 40 and 41, the relays 4
2. A load device 48 is configured by the inverter 43 and the electric motor 44, and the control device 45 also controls the load device 48.

Therefore, in the present embodiment, the microcomputer constituting the control means for controlling the electric washing machine and the microcomputer constituting the control means for controlling the electric leakage detecting device are shared for cost reduction. However, the present invention is not limited to this, and the control means may be constituted by separate microcomputers.

FIG. 7 is a structural view of the electric washing machine in the present embodiment. As shown in FIG. 7, the water receiving tub 49 is provided with a washing / dehydrating tub 51 in which a stirring blade 50 is rotatably provided on an inner bottom portion, and is suspended from a washing machine main body 53 by a suspension 52. The speed reduction mechanism 54 includes a water receiving tank 49.
, And transmits power to the stirring blade 50 and the washing and dewatering tub 51. An electric motor 44 is provided below the speed reduction mechanism 54.

The water supply valve 31 is for supplying water to the washing and dewatering tub 51, and the drain valve 32 is for draining washing water and the like in the washing and dewatering tub 53.

Here, the speed reduction mechanism 54 has a planetary gear,
When the stirring blade 50 is driven to rotate, the sun gear is connected to the electric motor 4.
The rotation of the planetary gear is driven by the rotating shaft of
With the configuration of transmitting to 0, the speed is reduced to 1/6 and the output torque of the electric motor 44 is converted to 6 times. When the washing and dewatering tub 51 is rotated in the dehydration step or the like, the speed reduction mechanism 54 is separated from the output shaft of the electric motor 44 by a clutch mechanism (not shown). Drive directly at 44.

As described above, in the electric washing machine shown in FIG. 7, since the electric motor 44 is disposed at the center of the water receiving tank 49, the water receiving tank 49 has a good weight balance, and In addition, the effect of eliminating the need to increase the weight and the effect of sharing components such as ball bearings with the components of the speed reduction mechanism 54 can realize a reduction in the weight of the electric washing machine.

However, in particular, such an electric motor 44
However, the present invention is not limited to the configuration described above. For example, there is a configuration in which the power of the electric motor 44 is transmitted to the reduction mechanism 54 by a belt, or a configuration in which the power is directly transmitted to the stirring blade 50 even in the washing process without providing the reduction mechanism 54. There may be.

In the above configuration, the control means 45 determines the abnormality of the leakage detection circuit 3 based on the output of the leakage detection circuit 3 when the current is supplied by the current generation circuit 7. Is stopped, and if no abnormality is found, the operation of the load device 48 thereafter is continued.

Further, the control means 45 is configured so that, at the start of the operation of the load device 48, the abnormality of the electric leakage detection circuit 3 is determined based on the output of the electric leakage detection circuit 3 when the current is supplied by the current generation circuit 7. I have.

The operation of the above configuration will be described with reference to FIGS. When the start switch on the operation unit 46 is pressed in step 61 in FIG. 8, the leakage detection circuit test subroutine shown in FIG. 9 is performed in step 62 to check whether the leakage detection circuit 3 is normal or abnormal. If the electric leakage detection circuit 3 is normal, the electric leakage detection circuit test subroutine is terminated, the washing control is performed in step 63, the rinsing control is performed in step 64, and the dehydration control is performed in step 65.

Here, an example of the leakage detection circuit test subroutine will be described with reference to FIG. When the leakage detection circuit test subroutine is started in step 71 of FIG. 9, the switching element 9 is turned on and the resistor 8 is energized in step 72. Then, the current value obtained by dividing the voltage value of the commercial power supply 10 by the resistance value of the resistor 8 is equal to the current value of the primary winding of the zero-phase current transformer 1.
The current flows only to the pole, and a current waveform as shown in FIG.

If the zero-phase current transformer 1 is normal, a voltage as shown in FIG. 5C is output to the secondary side of the zero-phase current transformer according to the current value. If the determination unit 2 is normal, when this voltage value exceeds the predetermined value Vs or −Vs several times,
As shown in FIG. 5D, a low signal is output for a predetermined period Ts1.

In step 73, the microcomputer constituting the control means 45 detects whether or not the judgment section 2 outputs low, and when confirming the low output, determines in step 74 that the leakage detection circuit 3 is normal. At 75, the switching element 9 is turned off to stop energizing the resistor 8, and at step 76, the leakage current detection circuit test subroutine ends when a predetermined time Ts6 has elapsed since the switching element 9 was turned off.

Here, the step 76 is not limited to the method of terminating the leak detection circuit test subroutine after the lapse of the predetermined time Ts6. For example, even when the output of the leak detection circuit 3 returns from low to high, the process ends. I do not care.

As shown in FIG. 5 (a), if the judgment section 2 does not output low during the predetermined period Ts4 after the switching element 9 is turned on, the leakage detection circuit 3 is abnormal at step 77. In step 78, the switching element 9 is turned off to stop the current supply to the resistor 8, and in step 79, the load device 48 constituting the electric washing machine is determined.
Operation is stopped thereafter.

In this embodiment, the leakage of the load device 45 is always detected during periods other than the leakage detection circuit test subroutine.

As described above, by executing the leakage detection circuit test subroutine immediately after the start switch is pressed, the abnormality of the leakage detection circuit is confirmed before the load device 48 constituting the electric washing machine operates, and the normal operation is performed. Since the load device is operated only in this case, even when the load device 48 is flooded and a leakage current is generated, the leakage detection circuit 3 operates to prevent leakage.

When the electric leakage detecting circuit 3 is abnormal, the load device 48 constituting the electric washing machine is not operated, so that electric leakage does not occur and the user is not shocked and the safety is improved. Can be.

(Embodiment 3) The control means 45 shown in FIG.
At the start of the operation of the load device 48, the abnormality determination of the electric leakage detection circuit 3 is performed.
Is stopped. Other configurations are the same as those of the second embodiment.

The operation of the above configuration will be described with reference to FIG. When the leakage detection circuit test subroutine is started in step 71 of FIG. 10, the switching element 9 is turned on and the resistor 8 is energized in step 72. Then, a current value obtained by dividing the voltage value of the commercial power supply 10 by the resistance value of the resistor 8 flows through only one pole of the primary winding of the zero-phase current transformer 1, and a current waveform as shown in FIG. .

If the zero-phase current transformer 1 is normal, a voltage as shown in FIG. 5C is output to the secondary side of the zero-phase current transformer according to the current value. If the determination unit 2 is normal, when this voltage value exceeds the predetermined value Vs or −Vs several times,
As shown in FIG. 5D, a low signal is output for a predetermined period Ts1.

In step 73, the microcomputer constituting the control means 45 detects whether or not the judgment section 2 outputs low, and when confirming the low output, determines in step 74 that the leakage detection circuit 3 is normal. At 75, the switching element 9 is turned off and the current supply to the resistor 8 is stopped. At step 76, the leakage detection circuit test subroutine ends.

As shown in FIG. 5 (a), if the judgment section 2 does not output low during a predetermined period Ts4 after the switching element 9 is turned on, the leakage detection circuit 3 determines in step 77 In step 78, the switching element 9 is turned off to stop the current supply to the resistor 8, and in step 79, the operation of the load device 48 is stopped thereafter. 3
A notification is given to indicate an abnormal condition.

As described above, the provision of the notifying means 47 for notifying the abnormality of the electric leakage detecting circuit 3 allows the user to operate the electric washing machine even if the electric washing machine is not operated and is stopped.
Can be determined to be abnormal, the leakage detection circuit 3 can be repaired, and the load device 48 of the electric washing machine can be repaired.
Does not operate, so that the user does not get an electric shock due to the electric leakage and the safety can be improved.

(Embodiment 4) The control means 45 shown in FIG.
When the power is turned on, an abnormality of the leakage detection circuit 3 is determined based on the output of the leakage detection circuit 3 when the current is supplied by the current generation circuit 7. Other configurations are the same as those of the second embodiment.

The operation of the above configuration will be described with reference to FIG. In step 81 of FIG. 11, the power switch of the operation unit 46 is pressed, and the power of the load device 48 is turned on by the power opening / closing means 6, and then the relay 42 is turned on.
Next, at step 82, a leakage detection circuit test subroutine is performed. This leakage detection circuit test subroutine is shown in FIG.
Alternatively, it is shown in FIG. If it is determined in the leakage detection circuit test subroutine that there is no abnormality in the leakage detection circuit 3, the washing control is performed in step 83, and when the washing control is completed, the rinsing control is performed in step 84, and the step 8 is performed.
At 5, the dehydration control is performed.

Here, if the control means 45 is in a state of being always energized, after pressing the power-on switch, a leakage detection circuit test subroutine is performed. If there is no problem in the leakage detection circuit 3, the power supply of the load device 48 is May be turned on by the power opening / closing means 6.

As described above, immediately after the power is turned on or immediately before the power is turned on, the abnormality of the electric leakage detecting circuit 3 is confirmed. If the electric leakage detecting circuit 3 is abnormal, the operation of the electric washing machine is stopped.
Electric shock to the user can be prevented, and safety can be improved.

As described above, since the user can always check the operation of the leak detection circuit 3 without consciously checking whether the operation of the leak detection circuit 3 is normal, the user is always worried about an electric shock. It is possible to realize a safe earth leakage detecting device.

The leak detection device and the leak detection circuit test method shown in each of the above embodiments are merely examples, and the present invention is not limited thereto.

[0069]

As described above, according to the first aspect of the present invention, a leakage current having a commercial power supply, power supply switching means for connecting the commercial power supply to a load device, and a zero-phase current transformer. Detecting means, current generating means for flowing a current only to one pole on the primary side of the zero-phase current transformer, and control means for inputting an output of the earth leakage detecting means, wherein the control means comprises: Since it is configured that the abnormality of the electric leakage detecting means is determined based on the output of the electric leakage detecting means when the current flows by the generating means, it is possible to automatically confirm the abnormality such as the failure of the electric leakage detecting means, It is possible to prevent the user from being electrocuted due to the failure of the means, and to improve safety.

According to the second aspect of the present invention, the control means determines an abnormality of the electric leakage detecting means based on an output of the electric leakage detecting means when a current flows by the electric current generating means. Stop the operation of the load device after this,
If it is not abnormal, it is configured to continue the operation of the load device thereafter, so if the leakage detection means breaks down and the leakage cannot be detected, the power supply to the load device will be stopped, and the user It is possible to prevent the load device from being operated erroneously despite the failure of the electric leakage detection means, and it is possible to prevent the electric shock due to the electric leakage of the load device,
Safety can be improved.

According to the third aspect of the present invention, there is provided a notifying means for performing a notifying operation, and the control means makes an abnormality judgment based on an output of the electric leak detecting means. Since it is configured to notify the abnormality of the detection means and stop the operation of the load device thereafter, the user can confirm that the leakage detection cannot be performed, and can prompt for repair or replacement. At the same time, when the leakage detection is impossible, the operation of the load device is stopped, and it is possible to prevent the user from being electrically shocked by the leakage of the load device, thereby improving the safety.

According to the fourth aspect of the present invention, the control means is configured to make an abnormality determination at the start of the operation of the load device based on the output of the leakage detecting means when the current is supplied by the current generating means. Therefore, it is possible to reliably confirm the failure of the leakage detection means before using the load device, and if the leakage detection device has failed, the operation of the load device remains stopped. Electric shock can be prevented even during the operation, and safety can be improved.

According to the fifth aspect of the present invention, the control means is configured to make an abnormality determination at the time of turning on the power supply, based on the output of the leakage detecting means when the current is supplied by the current generating means. Before using the load device, it is possible to confirm the abnormality of the leakage detection means, and if the leakage detection device is faulty, the operation of the load device is stopped. Electric shock can be prevented, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a ground fault detecting device according to a first embodiment of the present invention.

FIG. 2 is an input / output characteristic diagram of a zero-phase current transformer of the earth leakage detecting device.

FIG. 3 is an operation time chart when the earth leakage detection device detects an earth leakage.

FIG. 4 is an operation flowchart of an electric leakage detection circuit test of the electric leakage detection device.

FIG. 5 is an operation time chart of a leakage detection circuit test of the leakage detection device.

FIG. 6 is a block circuit diagram of an electric washing machine provided with an electric leakage detection device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of the electric washing machine provided with the electric leakage detection device.

FIG. 8 is an operation flowchart of the electric washing machine including the electric leakage detection device.

FIG. 9 is an operation flowchart of an electric leakage detection circuit test of the electric leakage detection device.

FIG. 10 is an operation flowchart of a leakage detection circuit test of the leakage detection device according to the third embodiment of the present invention.

FIG. 11 is an operation flowchart of an electric washing machine including an electric leakage detection device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Zero-phase current transformer 3 Leakage detection circuit (leakage detection means) 4 Control means 5 Load device 6 Power supply switching means 7 Current generation circuit (current generation means) 10 Commercial power supply

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hisashi Hagiwara 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 2G014 AA16 AB05 AB09 AB29 AB33 AC19 3B155 BA01 BA13 KB08 LB23 LC02 LC04 LC28 MA06 MA08

Claims (5)

[Claims] 1. A commercial power supply, a power supply switching means for connecting the commercial power supply to a load device, a leakage detecting means having a zero-phase current transformer, and one pole on a primary side of the zero-phase current transformer. And a control unit for inputting an output of the leakage detection unit, wherein the control unit is configured to control the leakage by an output of the leakage detection unit when the current is supplied by the current generation unit. An earth leakage detection device configured to determine abnormality of the detection means. 2. The control means performs an abnormality judgment of the electric leakage detection means based on an output of the electric leakage detection means when a current is supplied by the electric current generation means, and in the case of an abnormality, stops the operation of the load device thereafter, 2. The leakage detecting device according to claim 1, wherein the operation of the load device is continued thereafter if the abnormality is not abnormal. 3. An informing means for performing an informing operation, wherein the control means makes an abnormality determination of the electric leakage detecting means, and in the case of an abnormality, notifies the abnormality of the electric leakage detecting means by the informing means, and further loads the electric power. 3. The leakage detecting device according to claim 1, wherein the operation of the device is stopped. 4. The control device according to claim 1, wherein at the start of the operation of the load device, an abnormality is determined based on an output of the earth leakage detecting device when a current flows through the current generating device.
The electrical leakage detection device according to any one of claims 1 to 3. 5. The control device according to claim 1, wherein the control unit is configured to perform an abnormality determination based on an output of the leakage detection unit when the current is supplied by the current generation unit when the power is turned on. Electric leakage detection device.