JPH07301651A - Electrical wiring trouble monitor - Google Patents

Abstract

PURPOSE:To provide an electrical wiring trouble monitor for inspecting or monitoring the presence of abnormality of an electrical wiring system during construction work or production, or at the completed time thereof. CONSTITUTION:An electrical wiring trouble monitor has a disconnection and/or short circuit detecting circuit 21 for generating output corresponding to the presence of closed circuit formation in correspondence with each connecting terminal when a closed circuit is formed between a neutral line terminal N and plural connecting terminals L1, L2, L3...Ln, an earth detecting circuit 22 for detecting the generation of a micro current between an earth terminal G and plural connecting terminals L1, L2, L3...Ln so as to generate corresponding output, an informing means 3 for informing visibly and/or audibly according to the respective output of the disconnection and/or short circuit detecting circuit 21 and earth detecting circuit 22, and a power circuit 4 for supplying required power to the detecting circuits and informing means. The disconnection and/or short circuit detecting circuit 21 and the earth detecting circuit 22 can be selectively operated by a changeover switch EL.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wiring fault monitoring device for monitoring the occurrence of an accident or failure in electric wiring.
In particular, the present invention relates to an electric wiring fault monitoring device for monitoring the occurrence of an accident or a failure before energization due to an external obstacle to an electric wiring of a building under construction or other electric wiring of machinery.

[0002]

2. Description of the Related Art In general houses such as wooden structures, light-weight steel frames and 2 × 2, there is a tendency to frequently use cable wiring such as VVF without using a protective means such as a metal conduit tube. . This is because material costs and man-hours can be significantly reduced while satisfying electrical requirements.

Such a cable wiring is usually hidden in a true wall or a decorative wall, and it is often difficult to confirm it from the outside. However, when it is used after completion of construction, large-sized nails or screws are required. Except for special cases such as typing
The rate of suffering is low.

However, while construction work is in progress, construction engineers such as carpenters, plasterers and roofers, as well as construction engineers such as waterworks and gas, are congested in addition to persons in charge of electrical work. There are cases in which construction is required, and it is necessary to assume various situations.

During the period in which such various works are carried out redundantly, the cables which have already been covered up in the wall or the like are damaged, and a conducting test is conducted after the works are completed. Immediately or after some time, there are many accidents that cause failures. If such an accident is discovered after the completion of construction, it will take a long time to investigate the cause of the failure, and further repairs will be required, which requires time and money.

[0006] At such a time, it is often the case that skilled workers of other occupations who are judged to have completed construction are already absent, and in the worst case, delivery within the deadline may not be possible. This situation also applies to electrical wiring in shops, factories, etc., electrical wiring in mechanical equipment, etc., or control panels, switchboards, etc. being manufactured.

[0007] Therefore, although measures have been taken such as mutual monitoring, or separation of the test into possible ranges and repeating the test, a complete effect cannot be expected due to a failure in the concealed portion. is there.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and is for inspecting or monitoring the presence or absence of an abnormality in an electric wiring system during the progress of construction work or production or at the time of completion. of. An object is to provide an electric wiring fault monitoring device.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a closed circuit formed between a neutral wire terminal and a plurality of connection terminals.
It is confirmed that a minute current is generated between the disconnection and / or short circuit detection circuit that generates an output corresponding to the presence or absence of closed circuit formation corresponding to each of the connection terminals, and the ground fault terminal and the plurality of connection terminals. A ground fault detection circuit that detects and generates a corresponding output; a notification unit that performs visible and / or audible notification according to the outputs of the disconnection and / or short circuit detection circuit and the ground fault detection circuit; This is solved by an electric wiring fault monitoring device having a detection circuit and a power supply circuit that supplies required power to the notification means.

In this case, which of the disconnection and / or short circuit detection circuit and the ground fault detection circuit is to be activated can be selectively switched by the switching means.

[0011]

The electrical wiring fault monitoring apparatus according to the present invention selectively operates when detecting electrical wiring and / or a short circuit and when monitoring the insulation state by the leakage current between the ground line and the non-ground line. It can be operated by switching to. These circuits can include a plurality of circuits for monitoring a plurality of wirings at the same time. For example, the number of wiring circuits can be about 10 in consideration of the number of wiring circuits, but the number can be increased or decreased as appropriate. You can also do it.

When the disconnection and / or the short circuit of the electric wiring is detected, the neutral terminal is connected to one of the wirings and the respective connection terminals are connected to the other of the wirings. Each connection terminal can be configured to detect, for example, 10 lines at the same time, although it depends on the number of detection circuits included in the electrical wiring fault monitoring apparatus according to the present invention.

In such a connected state, disconnection and / or
Or activate the short circuit detection circuit. If a short circuit occurs in any of the wires to be detected, the disconnection and / or short circuit detection circuit produces an output indicating a short circuit condition. This output is transmitted to the notification means, and activates the lamp as the visual notification means and / or the buzzer as the audible notification means.

After confirming that no short circuit has occurred,
Even when a circuit break is detected, the same connection as described above is made. The vicinity of the end of the wiring is open, and the notification means does not operate in this state. In this state, a closed circuit is sequentially formed by jumper between the two wires at the terminal end of the circuit. As a result, if the notification means does not operate despite the jumper, it is detected that one of the electric wires is broken. Such detection can be easily performed by sequentially jumping the load connecting portions near the circuit terminal. It can also be implemented by inserting a jumper wire into an outlet near the end of the circuit. Note that the system can be similarly determined when the relationship between a plurality of lines is unknown.

When the insulation state is monitored by the leakage current between the ground line and the non-ground line, the G terminal of the ground fault detection circuit is connected to the steel frame of the building, the auxiliary ground terminal or the like. Then, the plurality of connection terminals of the ground fault detection circuit are connected to the non-ground line side of the electric wiring to be monitored. After the connection is made, the ground detection circuit is activated to detect the presence or absence of a leakage current between the ground line and the non-ground line, and the detection state can be monitored. If this insulation state is below a predetermined range, or in the extreme case 0 ohm, a short circuit has occurred, and it is necessary to immediately perform confirmation work.

Incidentally, these monitoring operations are not limited to the single-phase two-wire circuit, and by considering the connection of the neutral wire terminal of the disconnection and / or short circuit detection circuit or the G terminal of the ground fault detection circuit,
A single-phase three-wire circuit or a three-phase three-wire circuit can be similarly implemented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electrical wiring fault monitoring device according to the present invention will be described below. FIG. 1 is an electrical wiring fault monitoring device 1
3 is a block diagram showing the basic configuration of FIG. The electrical wiring fault monitoring device 1 is composed of a detection circuit 2, a notification means 3, and a power supply circuit 4.

The detection circuit 2 is a short circuit and / or disconnection detection section 2.
1 and the ground fault detection unit 22. Each of these detectors 2
1 and 22 are partially overlapped and can be switched and used by a relay or manually operated switches. The detection circuit 2 is provided with a neutral wire terminal N, a ground fault terminal G, and connection terminals L ₁ , L ₂ , L ₃ ... L _n to the circuit to be detected.

The notifying means 3 notifies the presence / absence of a failure by an appropriate means such as visible and / or audible, and can be the display lamp groups 31 and 32 and the buzzer 33 having different emission colors.

The power supply 4 supplies electric power for operation to the detection circuit 2 and the notification means 3, and can be used by rectifying and using a commercial power supply supplied from the outside. A battery power source using a battery or a secondary battery can also be used.

FIG. 2 is a circuit diagram of an embodiment in which the basic block diagram shown in FIG. 1 is constituted by relays R, lamps L _R , L _G , diodes D and the like. Here, as the power supply circuit and the protection device for ensuring the safety of the device, the conventional means can be adopted, and therefore the description thereof will be omitted.
Also, semiconductor elements may be adopted for each circuit. By forming a circuit with a semiconductor element, there is an advantage that power consumption can be reduced, and size and weight can be reduced.

In such a structure, the voltmeter V confirms that the direct current is activated and the specified voltage is generated. The switch EL controls the relay R, and switches the respective a and b contacts R ₁ and R ₂ . While the switch EL is off, the relay R is stationary, each contact is at the b contact, the neutral wire terminal N, and the red indicator lamp L _R.
Each of them is connected to the busbar. If switch EL is turned on, switched to a contact side relay R is operated, the ground terminal G, switched to green display line L _G.

In the upper right part of FIG. 2, n relays X are provided.₁, X₂
... X_nConnection terminal L via₁, L 2, L₃... L_nBut
It is provided. Each relay X₁, X₂... X_nIn
The circuit 1 enclosed by the chain line is attached. In this circuit 1
Is the relay X₁Pair of contacts and red indicator lamp that operate at
L_RAnd green display lamp L_GIs included. Both these la
Pump L_R, L_GIs relay X₁+ Voltage is applied by the operation of
The switch EL is operated depending on which one lights up.
Depending on whether the relay R is operating
Be done.

The other contact included in circuit 1 is the other end
Is connected to the buzzer BZ connected to the bus bar, the relay X
₁It is an audible signal that informs that the
is there. The notification means shown in the block diagram of FIG.
Red and green display lamp L R, L_RAnd buzzer BZ
Although it is formed by
A bell, a bell, a digital display or an analog meter, etc.
It can also be configured.

In the above-described embodiment, since L ₂ , L ₃ ... L _n in addition to the connection terminal L ₁ , relays are also provided with X ₁ , X ₂ ... X _n , respectively, and the circuit 2 3 ... n are provided. In this case, how to select the number of circuits n can be appropriately selected in consideration of various conditions such as an application, an outer shape of the device, and an allowable range such as weight.

FIG. 3 is a perspective view of the configuration of the embodiment of the electric wiring fault monitoring apparatus according to the present invention, which is housed in a housing as a small device. However, this is merely an example, and it is also possible to adopt a shoulder type, a two-divided configuration or the like.

FIG. 4 shows a connection state for monitoring disconnection, short circuit, etc. by the electric wiring fault monitoring apparatus according to the present invention. The electric wiring shows a single-phase three-wire type circuit, in which the terminal N is connected to the neutral wire, and each breaker B ₁ , B ₂ ,
Remove the non-grounded wire on the secondary side of B ₃ , and connect the terminals L ₁ and L of the device.
₂ and L ₃ are connected. The switch EL is turned off. In this state, the breakers B ₁ , B ₂ and B ₃ are turned on and monitoring is performed. Here, if there is a short circuit in the electricity, the buzzer BZ will sound and the red indicator lamp L _R corresponding to the terminal connected to the short circuit will light.

If there are no short-circuit points, neither the buzzer BZ nor the indicator lamp will operate. For the monitoring of disconnection, the load connection section or the outlet located at the end of the circuit is sequentially short-circuited while the above connection is maintained. Each time, the buzzer BZ sounds and the corresponding display lamp lights up, so it can be confirmed that there is no disconnection. If the wire is broken, neither the buzzer nor the indicator lamp is working.
Perform repair separately. In addition, in this case, when a large number of circuits are mixed, the present invention can be applied to the purpose of confirming the difference between the circuit groups.

FIG. 5 shows a ground fault or a fault in a single-phase two-wire circuit.
It shows a connection state for monitoring abnormality of edge resistance. Ground
The connection terminal G is connected to the steel frame of the building or a grounding electrode, etc.
Connection terminal L₁, L₂, L₃Is removed from the secondary side of breaker B
Connected to the respective non-grounded lines. After such connection,
Switch EL is turned on, connection terminal G and each connection terminal L
1, L₂, L₃A circuit is formed between the
It is possible to detect the magnitude of edge resistance. Insulation resistance
To accurately detect the magnitude of the
In addition to the display lamp, a resistance value display meter is installed.
However, it is desirable to form a simple insulation resistance tester. This
In this case, if the switch EL is turned off, the same short
It is possible to monitor whether there is a
It

FIG. 6 shows a connection state when a three-phase three-wire circuit is monitored. The neutral wire terminal N is connected to one of the three wires, here the S wire. The other two lines R and T
To the connection terminals L ₁ and L ₂ of the device, respectively.
The connection terminal G is connected to the steel frame of the building or the ground electrode.
If the switch EL is off in this state, the presence or absence of short circuit between the three wires and the presence or absence of disconnection are monitored by the tip jumper. Further, by turning on the switch EL, it is possible to monitor the presence or absence of a ground fault and the state of the insulation resistance.

The electric wiring fault monitoring apparatus according to the present invention is capable of not only monitoring the wiring equipment during the construction work as described above and monitoring when a failure occurs, but also checking the line in the remodeling work of the old equipment. It can also be used for Furthermore, the present invention can be easily applied to wiring confirmation in a factory or other industrial equipment, wiring confirmation in a control panel, fault monitoring, etc. as it is or by adding a few additional elements.

[0032]

As described above, according to the present invention, it is possible to easily monitor the abnormality of various electric wirings, or to confirm or investigate, while having a portable and simple structure. By applying this device, the wiring equipment can be easily monitored, surveyed, and confirmed when it is completed during the construction period. Therefore, there is an advantage that the construction period, especially the inspection period can be shortened and the safety can be expected to be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of an electrical wiring fault monitoring device according to the present invention.

FIG. 2 is a connection diagram showing an embodiment of the electrical wiring fault monitoring device shown in FIG.

FIG. 3 is a perspective view showing an external appearance of an embodiment of an electric wiring fault monitoring apparatus according to the present invention.

FIG. 4 is a connection diagram showing a connection state during monitoring of a single-phase three-wire circuit.

FIG. 5 is a connection diagram showing a connection state during monitoring of a single-phase two-wire circuit.

FIG. 6 is a connection diagram showing a connection state when a three-phase three-wire circuit is monitored.

[Explanation of symbols]

1 electric wiring fault monitoring apparatus 2 fault detection circuit 21 short and / or disconnection detection circuit 22 ground-insulation resistance detecting circuit 3 notification means 31 visible informing means (L _R) 32 visible informing means (L _G) 33 audible informing means 4 Power supply circuit

Claims (2)

[Claims] 1. A neutral wire terminal N and a plurality of connection terminals L ₁ ,
When a closed circuit is formed between L ₂ , L ₃ ... L _n ,
A disconnection and / or short circuit detection circuit 21 for generating an output corresponding to the presence / absence of formation of a closed circuit corresponding to each of the connection terminals.
And a ground fault terminal G and the plurality of connection terminals L ₁ , L ₂ , L ₃
..Depending on the ground fault detection circuit 22 that detects the occurrence of a minute current between L _n and generates a corresponding output, and the outputs of the disconnection and / or short circuit detection circuit and the ground fault detection circuit Means 3 for visually and / or audibly notifying
And a power supply circuit 4 for supplying required power to each of the detection circuits and the notification means. 2. The electrical wiring fault monitoring device according to claim 1, wherein the disconnection and / or short circuit detection circuit 21 and the ground fault detection circuit 22 are selectively operable by a changeover switch EL.