JPH0617087Y2 - Bypass confirmation device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bypass confirmation device. More specifically, the present invention is used when replacing a single-phase three-wire type or three-phase three-wire type watt hour meter in a live state. , Of the multiple pairs of insulated wires connected to the terminal of the watt hour meter, determine whether the bypass wire connected between the pair of insulated wires is normally connected between the corresponding insulated wires. Bypass confirmation device.

[Conventional technology]

For example, single-phase three-wire type or three-phase three-wire type watt hour meter (1)
Has a terminal portion (2) at the bottom of the meter body for counting and displaying the amount of electric power used, as shown in FIG. This terminal part (2) has six round-hole terminals (6a)-(8a) (6b)-(8b) to which insulated wires (3a)-(5a) (3b)-(5b) are connected. They are arranged in a straight line. On the other hand, the insulated wire (3a) ~ (5a) (3b)
~ (5b) is a conductive core wire (9a) ~ (11a) (9b) ~ (11b) is a coating treatment with an insulating covering material, at the connection end of the insulating coating (12a) ~ ( 14a) (12b) to (14b) are removed and the core wire (9
Expose a) to (11a) (9b) to (11b).

The insulated wires (3a) to (5a) (3b) to (5b) are connected to the terminal portion (2) by the core wire ((a) (12a) to (14a) (12b) to (14b) exposed). 9a)-(11a) (9b)-(11b) to each terminal (6a)-(8a) (6
b) to (8b) and then each terminal (6a) to (8a) (6b) to (8
Tighten the screws (15a) to (17a) (15b) to (17b) provided on (b) and inside the terminals (6a) to (8a) (6b) to (8b), core wires (9a) to (11a). (9
b) to (11b) are fixed. In addition, among these insulated wires (3a) to (5a) (3b) to (5b), three insulated wires
The other connection ends of (3a) to (5a) are connected to the load, and the other connection ends of the remaining three insulated wires (3b) to (5b) are connected to the AC power supply.

By the way, at the time of periodic inspection of the watt-hour meter or replacement work due to a failure, the insulated wires (3a) to (5a) (3b) to (5b) are connected to the terminals (6a) to (8a) of the terminal section (2). It must be detached between (6b) and (8b). At this time, the insulated wire (3b) on the power supply side
When (5b) is removed from terminals (6b) to (8b), a power failure occurs. Therefore, recently, a means has been taken to replace the watt-hour meter in a live state without causing a power failure. As shown in FIG. 5, this is the insulated wire (3a)-(5a) (3b)-(5b) from the terminal (2).
Prior to removing, the load side insulated wires (3a) to (5a) and the corresponding power source side insulated wires (3b) to (5b) are connected by bypass lines (3c) to (5c). Although not shown, connection terminals are attached to both connection ends of the bypass wires (3c) to (5c),
This connection terminal pierces through the insulation coating (12a)-(14a) (12b)-(14b) of the insulated wires (3a)-(5a) (3b)-(5b) and the core wire (9a)-
(11a) (9b) ~ (11b) contact, thereby insulated wire (3a)
~ (5a) (3b) ~ (5b) and the bypass lines (3c) ~ (5c) are electrically connected. After completing the connection of the bypass wires (3c) to (5c), connect the insulated wires (3a) to (5a) (3b) to (5b) to the terminal (6a) of the terminal section (2).
~ Remove from (8a) (6b) ~ (8b) and replace the electricity meter.

[Problems to be solved by the device]

By the way, as described above, when replacing the watt-hour meter in a live condition, the insulated wires (3a) to (5a) on the load side and the insulated wires (3b) to (5b) on the power supply side are made to correspond to each other. (3c) ~ (5
Must be connected in c).

In this bypass connection work, the operator misjudged the bypass wires (3c) to (5c) to the insulated wires (3a) to (5a) (3b) to (5b) that do not correspond on the load side and the power supply side. There is a problem that there is a risk of connection, and a short circuit accident occurs due to this erroneous connection, resulting in a lack of safety. Further, the bypass wires (3c) to (5c) are insulated terminals (3a) to (5a) (3b) to (5b) of the insulated wires (12a) to (14a) (12b) to (14b) depending on the connection terminals. Through the core wire (9a) ~ (1
1a) (9b) ~ (11b) to be contacted and electrically connected,
If it is difficult to determine whether or not the above-mentioned connection terminal is surely in contact with the core wires (9a) to (11a) (9b) to (11b) and the breakthrough state is insufficient, the bypass wire (3c) There is also a problem that a defective connection occurs between the insulated wires (3a) to (5a) (3b) to (5b) of (5c). In this way, the insulated wire on the load side and the power supply side
(3a) ~ (5a) (3b) ~ (5b) is surely connected to each other, and the bypass wire (3c) ~ (5c) connection terminal is an insulated wire (3a) ~ (5a) Whether it is electrically connected to (3b) to (5b) is a serious problem in the bypass connection work.

The present applicant has filed Japanese Patent Application No. 1-292968 to solve the above problems.
Filed the invention disclosed in No. However, according to the present invention, it is necessary to visually check the four display lamps to see if the bypass wire is properly connected to the insulated wire. Depending on the work situation, there is a risk of misidentifying any of the display lamps. There was another point where certainty was lacking.

Therefore, this invention is applied to Japanese Patent Application No. 1-29 filed by the applicant earlier.
It is a proposal that further improves on the one disclosed in No. 2968, and its purpose is to provide a bypass confirmation device capable of confirming the connection state of the bypass wire to the insulated electric wire with high reliability by a simple means. Especially.

[Means for Solving the Problems]

The technical means for achieving the above object of the present invention is to provide, among the insulated wires being charged, which are respectively connected to the power source side and the load side of the watt hour meter, the insulated wire on the power source side and the load side. A plurality of bypass wires that are temporarily connected to the insulated wire of the power supply side and the load side are connected between the corresponding insulated wires. Is connected between each bypass wire connected to the insulated wire on the power supply side, and the other connection end is connected to each bypass wire connected to the insulated wire on the load side. A pair of pulse generators that generate pulses at the output and the inputs are connected to the outputs of the paired pulse generators on the power supply side and the load side, and the output of the pulse generator circuit on the power supply side and the pulse generator circuit on the load side. Output the logical product with the output of Multiple phase detection circuits, the input is connected to the output of each phase detection circuit, the multiple pulse shaping circuits that shape the output pulse of each phase detection circuit and correct the phase difference, and the input each pulse shaping Connected to the output of the circuit, connected to the output of the single phase detection confirmation circuit and the phase detection confirmation circuit that outputs the logical product of each output of the pulse shaping circuit, and each bypass line based on the output signal Display means for informing whether or not it is normally connected and each bypass wire are connected in parallel, turned off when connecting each bypass wire to the insulated wire, and turned on after confirming the normal connection of the bypass wire by the display means.
And a bypass switch.

[Action]

In the bypass confirmation device according to the present invention, the confirmation of the connection state of the bypass wire to the insulated electric wire is simplified by digital processing. Specifically, a predetermined pulse is generated between the bypass lines by the pulse generation circuit, and the logical product of the output pulses of the paired pulse generation circuits is output from the phase detection circuit. The output pulse of each phase detection circuit is shaped by the pulse shaping circuit to correct the phase difference, and the phase detection confirmation circuit outputs the logical product of the output pulses of the pulse shaping circuits.
The display means is operated based on this output signal, and whether the output signal is high level or low level indicates the normal connection state or the abnormal connection state of the bypass line by the display means to simplify the confirmation. After confirming that the bypass wire is in the normal connection state, the bypass switch is turned on to bring the pair of insulated wires into conduction by the bypass wire.

〔Example〕

An embodiment of the bypass confirmation device according to the present invention will be described with reference to FIGS. Incidentally, this embodiment is the fourth
It is applied when replacing the single-phase three-wire type or three-phase three-wire type watt-hour meter shown in the figure in a live state.
The same or corresponding portions as those in the figure are designated by the same reference numerals, and duplicate description will be omitted.

In the bypass confirmation device shown in FIG. 1, (21) (22) and
(23) and (24) are two pairs of pulse generator circuits connected between the bypass lines (3c) and (4c), (4c) and (5c) and provided on the load side and the power supply side. A pulse is generated at a predetermined timing by the line voltage of (3c) to (5c). (25) and (26) are two phase detection circuits whose inputs are connected to each output of the load side pulse generation circuit (21) (22) and the power supply side pulse generation circuit (23) (24).
It outputs the logical product of the outputs of the pulse generation circuits (21) and (23) and (22) and (24). (27) (28) input is the above phase detection circuit (25) (26)
Two pulse shaping circuits connected to the output of
(25) Correct the phase difference by shaping the output pulse of (26). (29) is one phase detection confirmation circuit whose input is connected to each output of the above pulse shaping circuits (27) and (28).
(27) Output the logical product of each output of (28). Reference numeral (30) is a display means connected to the output of the phase detection confirmation circuit (29), which comprises a light emitting diode, an electronic buzzer or a voice ROM, and has a drive circuit (not shown) for operating these. (31) is the pulse generation circuit (21) (22) (23) (24), the phase detection circuit (25) (2)
6), a pulse shaping circuit (27) (28), a phase detection confirmation circuit (29) and a connection confirmation switch provided in a DC power supply line for driving the display means (30), (32) to (34) Is each bypass line
Bypass switch connected in series to (3c) ~ (5c), by utilizing the elastic force of the spring bypass line (3c) ~ (5c)
When an overcurrent flows to the device, it automatically turns off.

When replacing the watt-hour meter in a live-line state using the bypass confirmation device having the above configuration, first, the insulated wire (3a) to the terminal portion (2) of the watt-hour meter (1) ~
Bypass lines (3c)-(5c) are connected to (5a) (3b)-(5b). That is, one end of the bypass wires (3c) to (5c) is connected to the insulated wire (3a) to (5a) on the load side, and the other end is insulated wire (3b) to (5b) on the power supply side. Connect to. At this time, each bypass line (3
c) to (5c) are insulated wires (3a) corresponding to the load side and the power supply side.
And (3b), (4a) and (4b), and (5a) and (5b). The bypass wires (3c) to (5c) are insulated wires (3a) to (5a) (3b) to (5
Insulated wire (3a)-((a)) 5a) (3b) to (5b) are electrically connected.
When connecting the above-mentioned bypass lines (3c) to (5c), the bypass switches (32) to (34) are set to the OFF state in advance.

After connecting the bypass lines (3c) to (5c), the constituent circuit of the bypass confirmation device determines whether the connection state is normal or abnormal. Here, the line voltage of the insulated wires (3a) to (5a) (3b) to (5b) when the watt hour meter (1) is a single-phase three-wire type is shown in FIG. The line voltage in the case of is shown in FIG.

First, the connection confirmation switch (31) is turned on to set the constituent circuit of the bypass confirmation device to the operating state. At this time, the connection terminals of the bypass wires (3c) to (5c) are securely electrically connected to the insulated wires (3a) to (5a) (3b) to (5b) by the connection terminals, and the bypass wires (3c ) To (5c) are connected properly between the insulated wires (3a) to (5a) (3b) to (5b) on the load side and the power supply side, the insulated wires (3a) to ( 5a) (3b) ~ (5
b) line voltage (E ₁ ) (E ₂ ) (E ₃ ), that is, bypass lines (3c) to (5c)
The pulse generator circuits (21), (23), (2
Pulses (P ₁ ) (P ₂ ) (P ₃ ) are generated in (2) and (24), and mutual pulses (P ₁ ) (P ₂ ) (P ₃ ) are the same on the load side and the power supply side. It becomes a phase. Pulse generation circuit that supports this load side and power supply side
In-phase pulses output from (21) and (23), (22) and (24) are input to the phase detection circuit (25) (26), and this phase detection circuit (25) (26)
Outputs the logical product of its output pulses. Each phase detection circuit (2
The outputs of (5) and (26) both become high level and are input to the pulse shaping circuits (27) and (28). Here, the phase detection circuit (25) (2
Since the output pulse of 6) has a phase difference, the waveform is shaped by the pulse shaping circuits (27) and (28) to correct the phase difference. As a result, the logical product of the outputs from the pulse shaping circuits (27) and (28) is processed by the phase detection confirmation circuit (29), and as a result, the output from the phase detection confirmation circuit (29) becomes high level. Based on the output of the phase detection confirmation circuit (29), the display means (30) informs the operator that the bypass lines (3c) to (5c) are normally connected. Specifically, in the display means (30), for example, a light emitting diode is lit or blinked in green so as to be recognized based on the visual sense of an operator, or a voice ROM.
According to the method, command information such as "Turn on bypass switch" is uttered and recognized based on the visual sense of the operator, or both of them are used in combination.

On the other hand, if the connection ends of the bypass wires (3c) to (5c) are not electrically connected to the insulated wires (3a) to (5a) (3b) to (5b) by the connection terminals, they will be isolated. Electric wire (3a) ~ (5a) (3b) ~
Due to the line voltage of (5b), no voltage is generated between the bypass lines (3c) to (5c), and the pulse generation circuits (21) to (24) do not generate a predetermined pulse. The bypass wires (3c) to (5c) do not correspond to the load side and the power supply side.Insulated wires (3a) to (5a) (3b) to (5
b) In the case of an abnormal connection state in which they are erroneously connected to each other, the output pulse generated by the corresponding pulse generation circuit (21) and (23) or (22) and (24) on the load side and the power supply side The phases are out of phase.
Therefore, in the case of the poor connection state and the abnormal connection state described above, the outputs of the phase detection circuits (25) and (26) become low level, and finally the output of the phase detection confirmation circuit (29) also becomes low level. The output of the phase detection confirmation circuit (29) informs the operator that the bypass lines (3c) to (5c) are not in the normally connected state on the display means (30). Concretely, in the display means (30), for example, the light emitting diode is turned on or blinking in red, it is kept turned off, the electronic buzzer is sounded to give an alarm, or the audio ROM indicates "connection failure", etc. Make the information of utterance.

After determining the connection status of the bypass lines (3c) to (5c) with the bypass confirmation device as described above, the bypass lines (3c) to (3c) to
If (5c) is in normal connection, bypass switch (32)
~ Turn on (34) and turn off the connection confirmation switch (31)
By doing so, the work of connecting the bypass lines (3c) to (5c) is completed. After that, disconnect the insulated wires (3a) to (5a) (3b) to (5b) from the terminals (6a) to (8a) (6b) to (8b) of the terminal part (2) and then Replace the electricity meter. During this replacement work, if the load side is short-circuited for any reason, the bypass line (3
Bypass switch (32) due to overcurrent flowing in (c) to (5c)
~ (34) turns off automatically and insulated wire (3a) ~ (5a) (3b) ~
(5b) is cut off between the load side and the power supply side to ensure worker safety. After replacing the above electricity meter, use insulated wires (3a) to (5
a) Connect the connecting ends of (3b) to (5b) to the terminal part (2) of the new electricity meter.
After inserting and connecting to each terminal (6a) ~ (8a) (6b) ~ (8b) of
Insulate the bypass wires (3c) to (5c) with insulated wires (3a) to (5a) (3b) to (5b)
All work is completed by removing from.

Although the connection confirmation switch (31) is provided in the above embodiment, it is not always necessary. However, by providing the above-mentioned connection confirmation switch (31), after the bypass line is connected, the operator performs an operation to turn on the connection confirmation switch (31) to further confirm the lighting confirmation of the light emitting diode or the like. This is suitable for surely executing the operation of turning on the bypass switches (32) to (34) in succession to this operation. In this way, by interposing the ON operation of the connection confirmation switch (31) between the connection work of the bypass line and the ON operation of the bypass switches (32) to (34),
It is possible to prevent the insulated wire from being accidentally removed from the terminal portion of the watt hour meter by forgetting to turn on the bypass switches (32) to (34) after connecting the bypass wire.

[Effect of device]

According to the bypass confirmation device of the present invention, the confirmation of the connection state of the bypass wire to the insulated electric wire can be simplified by digital processing, and the certainty of the confirmation work is greatly improved.
It is possible to provide a highly reliable, highly practical bypass confirmation device with dramatically improved safety.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of a bypass confirmation device according to the present invention, and FIG. 2 is generated by a line voltage and pulse generation circuit of an insulated wire in a single-phase three-wire type watt hour meter. FIG. 3 is a waveform diagram showing a pulse, and FIG. 3 is a waveform diagram showing a line voltage of an insulated wire in a three-phase three-wire watt-hour meter and a pulse generated by a pulse generation circuit. FIG. 4 is a perspective view showing a terminal portion and an insulated wire of a single-phase three-wire watt-hour meter, and FIG. 5 is a perspective view showing a bypass wire connection state at the time of work for replacing the watt-hour meter in a live state. is there. (3a) ~ (5a) (3b) ~ (5b) ... insulated wire, (3c) ~ (5c) ... bypass wire, (21) ~ (24) ... pulse generation circuit, (25) (26) …… Phase detection circuit, (27) (28) …… Pulse shaping circuit, (29) …… Phase detection confirmation circuit, (30) …… Display means, (32) to (34) …… Bypass switch.

Claims (1)

[Scope of utility model registration request] 1. A power supply side insulated wire of a plurality of pairs connected to a power source side and a load side of an watt-hour meter, which is being charged, is temporarily provided between the power source side insulated wire and the load side insulated wire. This is to determine whether or not the connected multiple bypass wires are normally connected between the corresponding insulated wires on the power supply side and the load side, and one connection end is the insulated wire on the power supply side. Multiple pairs of pulses are generated between the connected bypass lines and between the bypass lines with the other connection end connected to the load-side insulated wire, and generate a pulse at a predetermined timing by the line voltage. A plurality of circuits, the inputs of which are connected to the outputs of the pulse generation circuits which form a pair on the power supply side and the load side, and which output the logical product of the output of the power supply side pulse generation circuit and the output of the load side pulse generation circuit. Of the phase detection circuit and the input of each phase detection circuit A plurality of pulse shaping circuits that are connected to the output and shape the output pulse of each phase detection circuit to correct the phase difference, and the input is connected to the output of each pulse shaping circuit and the output of each pulse shaping circuit. A single phase detection confirmation circuit that outputs a logical product,
Display means connected to the output of the phase detection confirmation circuit and notifying whether each bypass line is normally connected based on the output signal, and an insulated wire of each bypass line connected in parallel And a bypass switch which is turned off when the bypass line is connected and is turned on after confirming the normal connection of the bypass line by the display means.