JP2001314009A - Cable failure indicating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve difficulty in inspecting a cable failure indicating device and inability of adding a function to make it possible to communicate with external devices because of no power available because the detection of a ground fault-current utilizes the ground fault-current at the time of the occurrence of a ground fault in a prior art, or the problem of causing the device to become large when a plurality of systems are incorporated in a box. SOLUTION: One testing circuit or testing constant current AC power supply common to each of current sensors 5-1 to 5-3 is provided, and a third current sensor 5-5 is provided for driving a battery power supply common to a plurality of systems when a plurality of the system are treated as one. Also, a transmitting means is provided that gives signals for driving the batter power supply from the external transmitting device to have a communicating function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fault detection of a cable having a metal shield for each phase installed in a high-voltage AC circuit.

[0002]

2. Description of the Related Art A conventional example will be described with reference to a block diagram of FIG. In FIG. 6, a load 4 is connected via a switch 3 to a cable 2 having a metal shield 21 for each phase laid on a high-voltage AC overhead electric circuit 1. The resistor sensor 5 is connected to the ground line 6 of the metal shield 21.

In FIG. 6, reference numeral 7 denotes a conventional cable failure detector, which has a simple configuration of a resistor sensor 5, a ground fault current detection circuit 71, and a display 72. 711 is an output unit of the ground fault detection circuit 71, 721 is a display drive unit, 722 is a display unit,
723 is a return unit.

In this case, since the power supply of the ground fault current detection circuit 71 and the display 72 is derived from the ground fault current, it is difficult to stabilize the circuit power supply and it is not possible to take large energy. Therefore, it could not have complicated functions.

[0005]

However, in the above-described conventional configuration, the detection of the ground fault current uses the ground fault current at the time of the ground fault accident as a power source. Function to enable communication with external devices,
Alternatively, when a plurality of systems are built in a single housing, there is a problem that the device becomes large.

[0006]

According to the cable fault display device of the first means of the present invention, a first current sensor provided for each phase for detecting a ground fault current of a cable, and a zero-phase current are detected. A second current sensor, a battery power supply, and a third current sensor for detecting a zero-phase current for driving the battery power supply are provided, and when the zero-phase current exceeds a first predetermined value, the current Power supply driving means for connecting the battery power supply to a ground fault detection circuit, a ground fault detection circuit that operates when the zero-phase current exceeds a second predetermined value, and a second display that is displayed by the operation of the ground fault detection circuit. One display means, a second display means for displaying measurement results and the contents of past accidents, and an inspection switch, and when the inspection switch is turned on, an inspection signal is transmitted to the power supply driving means and the first Display means and the second table Means, the battery power is turned on for a predetermined time, and after the first display means is once operated within that time, the first display means is returned, and further the second display means is provided. The battery power is turned on for a predetermined time by the power supply driving means when the check switch is pressed, and the first display means is once operated within the time. After that, the first display means is restored, and the contents of the second display means are sequentially displayed, so that the apparatus can be easily operated by the built-in battery power supply without supplying external power. Has the function of enabling inspection.

Further, according to the cable fault display device of the second means of the present invention, a first current sensor provided for each phase for detecting a ground fault current of the cable, and a second current sensor for detecting a zero-phase current. A sensor, a battery power source, and a third current sensor for detecting a zero-phase current for driving the battery power source. When the zero-phase current exceeds a first predetermined value, a ground fault is detected by the current. Power supply driving means for connecting the battery power supply to a circuit, the ground fault detection circuit which operates when the zero-phase current exceeds a second predetermined value, display means for displaying by operation of the ground fault detection circuit, The first current sensor, the second current sensor and the third current sensor are provided with a test circuit for flowing a common test current, and a common test current is supplied to the first to third sensors. Provide a test circuit Such an action can be easily tested by passing a test current multiple sensors into a single test path by the.

Further, according to the cable fault display device of the third means of the present invention, a first current sensor provided for each phase for detecting a ground fault current of the cable, and a second current sensor for detecting a zero-phase current. A sensor, a battery power source, and a third current sensor for detecting a zero-phase current for driving the battery power source. When the zero-phase current exceeds a first predetermined value, a ground fault is detected by the current. Power supply driving means for connecting the battery power supply to a circuit, the ground fault detection circuit which operates when the zero-phase current exceeds a second predetermined value, display means for displaying by operation of the ground fault detection circuit, The battery power supply, the constant current circuit, the test switch, and the test constant current AC power supply for supplying a test current to a test circuit common to the first current sensor, the second current sensor, and the third current sensor. And said test The test current is caused to flow by operating the test switch, and the test constant current AC power supply for flowing the test current to the test circuit common to the first to third sensors is defined as the battery power supply. With the configuration including the current circuit and the test switch, the test current is caused to flow by the operation of the test switch, so that there is no need for a device for externally flowing the test current.

According to a fourth aspect of the present invention, there is provided a cable fault display device, comprising: a first current sensor provided for each phase for detecting a ground fault current of a cable; and a second current sensor for detecting a zero-phase current. A sensor, a battery power source, and a third current sensor for detecting a zero-phase current for driving the battery power source. When the zero-phase current exceeds a first predetermined value, a ground fault is detected by the current. Power supply driving means for connecting the battery power supply to a circuit, the ground fault detection circuit which operates when the zero-phase current exceeds a second predetermined value, display means for displaying by operation of the ground fault detection circuit, A test constant current AC power supply for flowing a test current through a test current path common to the first current sensor, the second current sensor, and the third current sensor is connected to the input frequency of the first current sensor and the battery. Power supply, constant current circuit and test switch And a test for flowing the test current through a test circuit common to the first to third sensors. The constant current AC power supply is configured by the frequency of the first sensor input, the battery power supply, the constant current circuit, and the test switch, and the test current is caused to flow by operating the test switch, so that the frequency of the high piezoelectric path is increased. Has the same function as the test current.

According to a fifth aspect of the present invention, there is provided a cable fault display device comprising: a second current sensor provided for each system for detecting a ground fault current of a plurality of cables; a battery power supply;
A third current sensor for detecting a zero-phase current for driving one battery power supply common to the respective systems, and when the zero-phase current exceeds a first predetermined value, a ground fault detection circuit by the current. Power supply driving means for connecting the battery power supply, the ground fault detection circuit for each system that operates when the zero-phase current exceeds a second predetermined value, and a ground fault operation display by the operation of the ground fault detection circuit. The third sensor for detecting the zero-phase current for driving the battery power supply common to each system does not need to be prepared by the first display means. And has the effect of reducing the size of the device.

Further, according to the cable fault display device of the sixth means of the present invention, a second current sensor provided for each system for detecting a ground fault current of a plurality of cables, a battery power supply,
One third current sensor for detecting a zero-phase current for driving one battery power supply common to the respective systems, and when the zero-phase current exceeds a first predetermined value, a ground fault is caused by the current. Power supply driving means for connecting the battery power supply to the detection circuit, the ground fault detection circuit for each system that operates when the zero-phase current exceeds a second predetermined value, and the operation of the ground fault detection circuit The ground fault operation display is displayed by display means provided for each system, and a plurality of systems are configured in one housing, and a plurality of cable fault indicators are combined with one device. By doing so, it is possible to reduce the size and to simplify the element parts by sharing the battery power supply, the display means, the power supply driving means, and the device housing.

Further, according to the cable fault display device of the seventh means of the present invention, a second current sensor provided for each system for detecting a ground fault current of a plurality of cables, a battery power supply,
A third current sensor for detecting a zero-phase current for driving one battery power supply common to the respective systems, and when the zero-phase current exceeds a first predetermined value, a ground fault detection circuit by the current. Power supply driving means for connecting the battery power supply, the ground fault detection circuit that operates when the zero-phase current exceeds a second predetermined value, and one common to a system displayed by the operation of the ground fault detection circuit. Display means,
The ground fault detection circuit for each system and the ground fault operation display of each system are configured to be displayed by one first display means by the operation of the ground fault detection circuit, so that only one first display means may be provided. Therefore, it has the effect of being economical and of making the device compact.

Further, according to the cable fault display device of the eighth means of the present invention, a second current sensor provided for each system for detecting a ground fault current of a plurality of cables, a battery power supply,
A third current sensor for detecting a zero-phase current for driving one battery power supply common to the respective systems, and when the zero-phase current exceeds a first predetermined value, a ground fault detection circuit by the current. Power supply driving means for connecting the battery power supply, the ground fault detection circuit which operates when the zero-phase current exceeds a second predetermined value, and a system for displaying common to each system by the operation of the ground fault detection circuit The first display means and the second display means common to each system, the first display means common to each system by the operation of the ground fault detection circuit, and the ground fault accident for each system By using one second display means for displaying the contents, it is possible to reduce the size of the apparatus by making it economical by using only one display means which needs to be displayed for each system.

According to a ninth aspect of the present invention, there is provided a cable fault display device, wherein a sensor for detecting a ground fault current of the cable is provided, and a battery power supply and a zero-phase current exceeding a first predetermined value are provided. Power supply driving means for connecting the battery power supply to the ground fault detection circuit by the current; the ground fault detection circuit operating when the zero-phase current exceeds a second predetermined value; and the operation of the ground fault detection circuit. A display means for displaying, and a power supply from an external device are controlled by communication with the external device, and a cable failure display device is provided by outputting a power drive signal to a power drive line through communication with the external device. Communication can be performed even if the battery power supply is always disconnected.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of Embodiment 1 of the present invention. In FIG. 1, 1 is a high-voltage AC overhead electric circuit, and 2 is a metal shield 21 for each phase.
The metal shield 21 is grounded by the collective ground line 6-2 after the ground lines 6-1 for each phase are collectively connected.

A load 4 is connected from the cable 2 to the high-voltage AC overhead electric circuit via the switch 3. on the other hand,
A first current sensor 5-1, 5-2 and 5-3 for detecting a ground line current is provided on the ground line 6-1 of the metal shield 21 for each phase, A ground wire 6-2 connected to the metal shield 21 and grounded has a second current sensor 5-4 for detecting a ground fault current and a third current source for driving a battery power supply with the ground fault current. A current sensor 5-4 is provided.

The outputs of the first current sensors 5-1 to 5-3 are input to the phase ground line current detection circuit 73 of the cable fault display device 7, and then the outputs of the second current sensors 5-1 to 5-3. The output of the current sensor 5-4 is input to the ground fault detection circuit 72, and the output of the third current sensor 5-4 is input to the power supply driving means 71.

Further, the cable failure display device 7 is provided with an inspection signal 77 and an inspection push button switch 78.
Then, when the input from the third current sensor 5-5, that is, the zero-phase current exceeds the first predetermined value, the power supply driving means 71 closes the power supply contact 76 to connect the battery power supply 75 to the entire cable fault display device. It is supplied as power.

Next, the ground fault detecting circuit 72 performs a ground fault detecting operation when the input from the second current sensor 5-4, that is, the zero-phase current exceeds a second predetermined value, and holds a permanent display. One display means 74 is used to display a ground fault. The first predetermined value of the zero-phase current is set lower than the second predetermined value of the ground fault current.

Next, each phase ground line current detection circuit 73 detects the input from the first current sensors 5-1 to 5-3, measures the ground line current for each phase, and detects a ground fault in the event of a ground fault. This is to determine which phase has a ground fault.

Next, the second display means 741 displays the current measurement results of each phase ground line current detection circuit 73 and the ground fault detection circuit 72 when the power is turned on and the measurement results at the time of the past ground fault accident,
It is also for displaying the battery voltage.

Next, the inspection signal 77 is displayed on the first display means 74.
Is displayed once, the display is restored, the normal operation of the display is confirmed, and at the same time, the above-described measurement results can be sequentially displayed and confirmed by the second display means 741. This function is used to determine whether or not this device is normal when pressed.

In the configuration described above, the first to third current sensors are provided outside the cable fault display device. However, each current sensor may be built-in.

(Embodiment 2) FIG. 2 is a block diagram of Embodiment 2 of the present invention, and a description of components already described below with common numbers will be omitted.

Here, the difference between the constitutions of FIGS. 1 and 2 is that the first current sensor 5-1 to the third current sensor 5-5 are connected to a test current common to one first to third current sensors. The test circuit 8 through which the test signal flows is supplied, so that the test current flows from the AC current test device 9 separately prepared in the test circuit 8 to easily and easily perform the performance test of the cable fault display device 7. You can do it.

(Embodiment 3) FIG. 3 is a block diagram showing Embodiment 3 of the present invention.
The difference between the configuration of FIG. 2 of FIG. 2 and the configuration of FIG. 3 of the third embodiment is that the second embodiment is different from the second embodiment in that a test current is supplied by an AC current test device 9 separately prepared. A constant-current AC power supply 79 is provided in the apparatus. When a check push button switch 78 is pressed and a check signal 77 is given, a test current common to the first to third current sensors flows through one test circuit 8. This makes it possible to perform a test including the performance of each current sensor without preparing an external test apparatus.

Further, the frequency signal detected by the first sensor is supplied to the test constant current AC power supply 79 for each phase ground line current detection circuit 7.
By inputting the test current through the AC power supply 3 and adjusting the frequency of the test current of the test constant current AC power supply 79 to the high-voltage AC overhead electric circuit 1, it is possible to perform a test close to the actual test.

(Embodiment 4) FIG. 4 is a block diagram showing Embodiment 4 of the present invention.
The difference between the configuration of FIG. 4 of FIG. 4 and that of FIG. 1 of the first embodiment is that the measured electric circuit is a single system in the first embodiment, whereas the fourth embodiment has a plurality of systems. In the example, there are two systems, and the two high-voltage AC overhead electric circuits 1 are provided with the first current sensor and the second current sensor in accordance with the number of the systems. Only provided.

The ground fault line current detection circuit 73 and the ground fault current detection circuit 72 of the cable fault display device 7
The first current sensor and the second current sensor of the system are input, while one third current sensor common to the two systems is input to the power supply driving unit 71.

Although the third current sensor is common to the systems in FIG. 4, it may be provided for each system.

Next, as for the first display means 74 or the second display means 741, the number of systems may be prepared so as to be displayed for each system, or one system may be prepared for each system. Good. The battery power supply can be one battery power supply regardless of the number of systems.

(Embodiment 5) FIG. 5 is a block diagram showing a fifth embodiment of the present invention.
The difference between FIG. 5 of FIG. 5 and FIG. 1 of the first embodiment is that an external signal power supply driving unit 792 and a communication unit 791 are provided in the cable fault display device 7 of the first embodiment.

The communication with the outside of the cable fault display device 7 is performed by connecting the external communication device 10 and the cable fault display device 7 with a communication line 10-2 and a power supply driving line 10-1 as shown in the figure. When the communication is required between the cable failure display device 7 and the external communication device 10, the external communication device 10 outputs a power driving signal of the external signal power driving unit 792 to the power driving line 10-1. By doing so, the battery power of the cable failure display device 7 is supplied, so that communication is possible when necessary even if the battery power supply 75 of the cable failure display device 7 is always disconnected.

[0035]

As is apparent from the above description, according to the cable fault display device of the first means of the present invention, when the check push button switch is pressed, the battery power is turned on by the power supply driving means for a specific time, and After the first display means is once operated within the time, the first display means is returned, and the inspection function for sequentially displaying the contents of the second display means is provided. Has the effect that the device can be easily inspected by the built-in battery power supply without supplying the power.

Further, according to the cable fault display device of the second means of the present invention, a plurality of sensors can be connected to one by providing a test circuit for passing a common test current to the first to third sensors. The effect is that the test can be easily performed by passing the test current through the test circuit.

Further, according to the cable fault display device of the third means of the present invention, a test constant current AC power supply for supplying a test current to a test circuit common to the first to third sensors is connected to a battery power supply. And the constant current circuit and the test switch, the test current is caused to flow by the operation of the test switch, which has an effect of eliminating the need for a device for externally flowing a test current.

According to the cable fault display device of the fourth means of the present invention, a test constant current AC power supply for supplying a test current to a test circuit common to the first to third sensors is provided. The test current is the same as the frequency of the high-voltage circuit by using the sensor input frequency, the battery power supply, the constant current circuit, and the test switch to make the test current flow by operating the test switch. Has the effect of enabling

Further, according to the cable failure display device of the fifth means of the present invention, it is not necessary to prepare the number of third sensors for detecting the zero-phase current for driving the battery power supply common to each system. Therefore, the present invention has the effect of being economical and capable of miniaturizing the apparatus.

Further, according to the cable fault display device of the sixth means of the present invention, the size is reduced by using a plurality of cable fault indicators as one device, and the battery power supply, the display means, and the power supply drive means are provided. In addition, there is an effect that the element portion can be simplified by sharing the device housing.

Further, according to the cable fault display device of the seventh means of the present invention, the ground fault detection circuit for each system and the operation of the ground fault detection circuit are used to display the ground fault operation of each system as one first display means. , The first display means may be one, so that it is economical and has the effect of enabling the device to be downsized.

Further, according to the cable fault display device of the eighth means of the present invention, one first display means common to each system is displayed by the operation of the ground fault detection circuit, and the contents of the ground fault accident for each system are displayed. The use of a single second display means makes it possible to reduce the size of the apparatus by making it economical by using only one display means that needs to display each system.

According to the cable fault display device of the ninth means of the present invention, the battery power in the cable fault display device is constantly output by outputting the power drive signal to the power drive line by communication from an external device. This has the effect of enabling communication even when disconnected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block configuration diagram according to the second embodiment.

FIG. 3 is a block configuration diagram according to the third embodiment.

FIG. 4 is a block diagram of a fourth embodiment.

FIG. 5 is a block diagram of the fifth embodiment.

FIG. 6 is a conventional block configuration diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-voltage AC overhead electric circuit 2 Cable 3 Switch 4 Load 5-1 5-2, 5-3 First current sensor 5-4 Second current sensor 5-5 Third current sensor 6-1 Ground wire 7 Cable fault display device 8 Test circuit 9 AC current test device 10 External communication device 71 Power supply driving means 72 Ground fault detection circuit 73 Each phase ground wire current detection circuit 74 First display means 741 Second display means 75 Battery power supply 77 Inspection signal 79 Constant current AC power supply for test 791 Communication means 792 External signal power supply driving means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomohiro Fujii 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 2G014 AA04 AB20 AB33 AC15 2G033 AA02 AB02 AC02 AE06

Claims (9)

[Claims] 1. A first current sensor provided for each phase for detecting a ground fault current of a cable, a second current sensor for detecting a zero-phase current, a battery power supply, and a power supply for driving the battery power supply. A third current sensor for detecting a zero-phase current, and when the zero-phase current exceeds a first predetermined value, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current; The ground fault detection circuit that operates when the current exceeds a second predetermined value, first display means for displaying by operation of the ground fault detection circuit, and second display for displaying measurement results and past accident contents. The battery comprises a display unit and an inspection switch, and supplies an inspection signal to the power supply driving unit, the first display unit, and the second display unit when the inspection switch is turned on, so that the battery is maintained for a predetermined time. Power on After once operating the first display means within the time, the first display means is returned,
Further, a cable failure display device having an inspection function for sequentially displaying the contents of the second display means. 2. A first current sensor provided for each phase for detecting a ground fault current of a cable, a second current sensor for detecting a zero-phase current, a battery power supply, and a battery power supply for driving the battery power supply. A third current sensor for detecting a zero-phase current, and when the zero-phase current exceeds a first predetermined value, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current; The ground fault detection circuit that operates when the current exceeds a second predetermined value, display means for displaying by operation of the ground fault detection circuit, the first current sensor, the second current sensor, and the third A cable fault display device having a test circuit for supplying a common test current to a current sensor. 3. A first current sensor provided for each phase for detecting a ground fault current of a cable, a second current sensor for detecting a zero-phase current, a battery power supply, and a power supply for driving the battery power supply. A third current sensor for detecting a zero-phase current, and when the zero-phase current exceeds a first predetermined value, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current; The ground fault detection circuit that operates when the current exceeds a second predetermined value, display means for displaying by operation of the ground fault detection circuit, the first current sensor, the second current sensor, and the third A test constant current AC power supply for flowing a test current through a test circuit common to the current sensor is configured by the battery power supply, the constant current circuit, and the test switch, and the test current is supplied to the test switch. Flow by operation Cable fault display device. 4. A first current sensor provided for each phase for detecting a ground fault current of a cable, a second current sensor for detecting a zero-phase current, a battery power supply, and a power supply for driving the battery power supply. A third current sensor for detecting a zero-phase current, and when the zero-phase current exceeds a first predetermined value, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current; The ground fault detection circuit that operates when the current exceeds a second predetermined value, display means for displaying the operation by the operation of the ground fault detection circuit, the first current sensor, the second current sensor, and the third A test constant current AC power supply for flowing a test current through a test circuit common to the current sensor is constituted by an input frequency of the first current sensor, the battery power supply, a constant current circuit, a test switch, and The test current for the test A cable fault display device that is turned on by operating a switch. 5. A second current sensor provided for each system for detecting a ground fault current of a plurality of systems of cables, a battery power supply, and a zero-phase for driving one battery power supply common to the respective systems. A third current sensor for detecting a current, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current when the zero-phase current exceeds a first predetermined value, A ground fault detection circuit for each system that operates when a predetermined value is exceeded, and a ground fault operation display is displayed by a first display means by an operation of the ground fault detection circuit. 6. A second current sensor provided for each system for detecting a ground fault current of a cable of a plurality of systems, a battery power supply, and a zero-phase for driving one battery power supply common to the respective systems. One third current sensor for detecting a current, and when the zero-phase current exceeds a first predetermined value, power supply driving means for connecting the battery power to a ground fault detection circuit by the current,
A ground fault detection circuit for each system that operates when the zero-phase current exceeds a second predetermined value; and display means provided for each system for displaying a ground fault operation display of each system by operation of the ground fault detection circuit. And a plurality of systems constituted by one housing. 7. A second current sensor provided for each system for detecting a ground fault current of a plurality of systems of cables, a battery power source, and a zero-phase for driving one battery power source common to the respective systems. A third current sensor for detecting a current, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current when the zero-phase current exceeds a first predetermined value, A cable fault display device comprising: the ground fault detection circuit that operates when a predetermined value is exceeded; and one display unit common to a system displayed by the operation of the ground fault detection circuit. 8. A second current sensor provided for each system for detecting a ground fault current of a plurality of systems of cables, a battery power supply, and a zero-phase for driving one battery power supply common to each of the systems. A third current sensor for detecting a current, power supply driving means for connecting the battery power supply to a ground fault detection circuit by the current when the zero-phase current exceeds a first predetermined value, The ground fault detection circuit that operates when the predetermined value is exceeded, and one first display unit and a second display unit that are common to systems that display common to each system by the operation of the ground fault detection circuit. Cable failure display device. 9. A sensor for detecting a ground fault current of a cable is provided, and when the zero-phase current exceeds a first predetermined value, the battery power source is connected to a ground fault detection circuit by the current. Power supply driving means, the ground fault detection circuit which operates when the zero-phase current exceeds a second predetermined value, display means for displaying by operation of the ground fault detection circuit, and power supply from an external device to the external Cable fault display device controlled by communication with equipment.