JP2610191B2 - Low pressure bypass switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) [Industrial application field] The present invention relates to a method of replacing a pole transformer, for example.
The power load applied to the transformer is switched in parallel to the secondary side of an adjacent pole transformer, etc., and work such as replacement can be performed completely without interruption without instantaneous power failure of the load. Thus, the present invention relates to a low-pressure bypass switch.

(B) [Prior art] Conventionally, in the case of remounting a pole transformer, for example, during the construction work, a power supply to a customer loaded on the transformer is cut off, or another pole transformer is connected to another pole transformer. The work was temporarily switched to the next side.

In the case of this switching, since the voltage and the phase of the two power sources do not always match, the power outage switching is required, and there is a problem that the power outage inconveniences the customer.

However, recently, due to the spread of electronic devices and the like, not only power outage work but also temporary power outage is not allowed.

(C) Problems to be Solved by the Invention In order to eliminate such a power outage, it is necessary to switch the load of the working transformer in parallel to the secondary side of the adjacent pole transformer. In order to match the voltage and phase of both power supplies, the voltage and phase were read using a tester or phase detector, and a person judged it, and the phase was confirmed. In addition, there are restrictions such as misreading of instruments and erroneous judgment, as well as the necessity of an operator's judgment ability.

According to the present invention, if the connection of the connector is changed according to the display on the display, except for such restrictions as misreading or misjudgment of the meter at the time of phase detection, or the need for an operator to have the ability to judge, the present invention can be easily and reliably performed. The present invention provides a low-voltage bypass switch that can connect both power sources in parallel by turning on a switch when the voltage and the phase are adjusted.

(D) [Means for Solving the Problems] As shown in FIGS. 1 to 5, the A-phase / B-phase / C-phase of the temporary power supply side connector 6 connected to the three-phase four-wire low-voltage power supply The electromagnetic contactor 1 and the thermal relay 3 are connected in series between the a-phase, the b-phase, and the c-phase of the working-side connector 7, and the electromagnetic contactor 2 is connected in series between the ground phase E and the e-phase. The phases A, B, C, E of the side connector 6 and the phases a, b, c, e of the work side connector 7 are connected to the input terminals 5 of the control box 4, respectively. A, B, C, E phases of the side connector 6 and a of the work side connector 7
・ Calculate and detect the voltage and phase sequence of each phase of the temporary power supply lead wire 40 and the work lead wire 50 connected to each phase of b, c, e, , Calculate and display the phase compatibility, and if they match, the electromagnetic contactor 2.
1 and a low-pressure bypass switch body 8 for displaying an operation confirmation display. The operation of the control box 4 is displayed on a liquid crystal display, the power distribution method is selected, the electromagnetic contactor is turned on, opened, and restarted. This is a low-pressure bypass switch having a structure including an operation box 9 for remotely controlling calculations and a connection cable 10 for connecting the low-pressure bypass switch body 8 and the operation box 9.

In FIG. 1, the contact reading terminal 11 of the control box 4 is connected to auxiliary contacts of the electromagnetic contactors 1 and 2 and the thermal relay 3.

Operation command terminal 12 has solid state relays 13 and 14.
The main circuit of the solid state relay 13 includes auxiliary contacts of the electromagnetic contactor 2 and the thermal relay 3 and the electromagnetic contactor 1
Are connected in series with the temporary power supply side connector 6 between the A phase and the B phase.

The main circuit of the solid state relay 14 is connected between the A and B phases of the temporary power supply side connector 6 with the magnet coil 16 of the electromagnetic contactor 2 connected in series.

Further, the auxiliary contact of the electromagnetic contactor 1 is connected between the A-phase and the B-phase of the temporary power supply side connector 6 in series with the closing lamp 18 and the opening lamp 17, respectively.

In the operation box 9, a liquid crystal display 19, a power distribution system switch 20, a closing switch 21, an opening switch 22, a reopening switch 23, a display lamp 24 holding data, and a buzzer 25 for phase mismatch display are controlled by the microcomputer 26, respectively. The microcomputer 26 is connected to the control box 4 of the low-pressure bypass switch body 8 and the connection cable.
The structure is connected by 10.

The connection method between the control box 4 and the operation box 9 is a balanced serial communication method (RS-422).
By adopting such a structure, the effect of noise is minimized.

Next, as shown in FIGS. 1 and 2, the control box 4 includes a voltage dividing circuit 30, an analog / digital conversion board.
It comprises a microcomputer 31, an input / output board 33, a communication board 34, and a power supply circuit 35.

The microcomputer 32 includes a three-phase four-wire system, a single-phase three-wire system, and the like.
The inter-phase voltage value and the phase sequence of the required power distribution system are stored as follows, and the required power distribution system is selected by the power distribution system selection switch 20, which is used as a reference for the calculation conformity comparison of the voltage / phase sequence.

Next, the power supply circuit 35 includes the analog / digital conversion board 31, the input / output board 33, the microcomputer 32, and the communication board 34 of the switch.
The power supply circuit supplies the required power of each part, and the power is supplied from the A phase and the B phase of the temporary power supply side connector 6.

The input / output board 33 includes a power distribution method selection switch 20, a recalculation switch 23, a closing switch 21, an open switch 22,
Alternatively, it is an input / output unit for information such as a relay operation circuit and a contact reading circuit.

Next, a specific embodiment of the present invention will be described. In addition to the provision of a three-phase four-wire provisional power supply side connector 6 and a working side connector 7 and a frame 37 for protecting the same, upper and lower portions of the box, A closing lamp 18 and an opening lamp 17, a connector 27 for connecting to the operation box 9, a thermal relay reset button 36 and a ground terminal 28 are provided at a lower portion of the box, and the control box 4 is controlled in the box and is controlled by the control box 4. Electromagnetic contactors 1, 2,
Thermal relay 3, solid state relays 13 and 14,
A low-voltage bypass switch body 8 which is internally connected to the above connectors 6, 7 and lamps 18, 17 and the like, and has a one-touch mounting bracket 38 for a telephone pole on the back of the box, and a liquid crystal display on the surface of the box. 19, distribution system switch 20,
ON switch 21, Open switch 22, Recalculation switch 23,
The display lamp 24 and the buzzer 25 that are holding data are exposed and provided, and the connection cable 10 is detachably provided at the bottom of the box.
An operation box 9 which is connected so as to be controlled by a microcomputer 26 in the box, and a structure in which the low-pressure bypass switch body 8 and the operation box 9 are detachably connected by a connection cable 10. .

(E) Action To use the low-pressure bypass switch of the present invention, first,
In FIGS. 2, 2, 3, 4, and 5, the main switch body 8 is hung on a utility pole by hanging a wire on a suspension ring 41 as shown in FIG. Mounting bracket 39
Then, the one-touch mounting bracket 38 of the switch body 8 is hooked and mounted, and the ground terminal 28 is securely grounded.

Next, the temporary power supply side lead wire 40 drawn from the transformer secondary side power supply or the like of the adjacent column is connected to the temporary power supply side connector 6,
The working-side connector 7 is connected to a working-side lead wire 50 connected to the secondary side of the working transformer.

When connected, the power supply circuit 35 of the control box 4 is utilized by the A and B phases of the temporary power supply side connection connector 6,
Supply operation power for each part.

Then, the liquid crystal display 19 of the operation box 9 shown in FIG.
"Low pressure bypass switch" is displayed.

Next, when the recalculation switch 23 is pressed, "Please set the power distribution method" is displayed.

When the power distribution system switch 20 is set to, for example, “three-phase four-wire system” and the recalculation switch 23 is pressed, “3” is displayed on the liquid crystal display 19.
"Phase 4-wire 100 / 200V" is displayed. If the display is confirmed and there is no mistake, the recalculation switch 23 is pressed as it is.

If the displayed power distribution method is incorrect, press the release switch 22 to display the initial display "Low-voltage bypass switch".
Is displayed, the power distribution system switch 20 is set again.

After that, when the recalculation switch 23 is pressed, the voltage and phase sequence of each phase of the temporary power supply side connector 6 and the working side connector 7 are
Input from the input terminal 5, the voltage is divided by the voltage dividing circuit 30, A / D converted by the analog / digital conversion board 31, and the microcomputer 32
Compatible with the voltage / phase sequence of the setting distribution method stored in the above, and the presence / absence of phase compatibility is detected by calculation, and the communication board 34 → connection cable 10 → microcomputer 26 of the operation box 9 conforms to the liquid crystal display 19 If the switch is turned on, "OK OK" is displayed.Pressing the switch 23, the switch 23 → microcomputer 26 → connection cable 10 → communication board 34 → microcomputer 32 →
I / O board 33 → Solid state relays 14 and 13 operate magnet coils 16 and 15 to produce electromagnetic contactors 2.1
Is supplied, the provisional power supply side connection connector 6 and the work side connection connector 7 are connected, and the provisional power supply side lead wire 40 and the work side lead wire 50 are connected in parallel.

However, if the phases are shifted by 120 degrees on the high voltage side of the transformer to which the temporary power supply side lead wire 40 and the work side lead wire 50 are connected, a three-phase four-wire type A-
Since a potential difference of 173 V between the phases a and B-b and 300 V between the phases C-c (assuming the inter-phase voltage is 100 V / 200 V), the phases of the voltages on the temporary power supply side and the work side match. Also, since the phases are different, “ON after power failure” is displayed on the liquid crystal display 19.

In this case, when the power of the working side is cut off, “OK” is displayed.

Next, when the connection between the temporary power supply side and the working side lead wire is incompatible, for example, the temporary power supply side lead wire 40 and the working side lead wire are connected to the temporary power supply side connection connector 6 and the working side connection connector 7 of the switch. 5 are connected as shown in FIG. 5, when the recalculation switch 23 is pressed, the voltage deformation of the temporary power supply side lead wire 40 and the working side lead wire 50 is divided by the voltage dividing circuit 30, The digital-to-analog conversion board 31 performs digital conversion, the microcomputer 32 calculates the voltage value and the phase sequence between the connectors, compares the voltage with the previously stored three-phase four-wire voltage and the phase sequence, and calculates the two connectors. Since the connection does not match, the connection change display of the connector is warned by the buzzer 25 by the communication board 34 → connection cable 10 → microcomputer 26, and the liquid crystal display
At 19, a message for changing the connection between the working side connector 7 and the working side lead wire 50 is displayed as "working side replacement a ← → e".

Then, when the working-side lead wires 50 connected to the a-phase and the e-phase of the working-side connector 7 are interchanged and connected, the connection shown in FIG. 6 is obtained.

Next, when the recalculation switch 23 is pressed in the connection shown in FIG. 6, the same calculation detection as described above is performed, and a message "Temporary power supply side replacement B.fwdarw.C" is displayed on the liquid crystal display 19.

When the B-phase and the C-phase of the power supply side connector 6 are switched and connected according to this message, the connection shown in FIG. 7 is obtained.

Next, when the recalculation switch 23 is pressed, the same operation for detecting the voltage and the phase sequence is performed to display “work-side replacement a → b” on the LCD 19.
→ c → a ”message is displayed.

According to this message, a
The working lead 50 connected to the b-phase, the working lead 50 connected to the b-phase to the c-phase, and the working lead 50 connected to the c-phase to the a-phase. If the connection is changed, the connection shown in FIG. 8 is obtained. Then, "OK" is displayed on the liquid crystal display 19.

After confirming the indication "OK" and pressing the switch 21, the operation of the magnet coils 16 and 15 turns on the electromagnetic contactor 2.1 and turns on the closing lamp 18 and the opening lamp.
Reference numeral 17 turns off, “ON” is displayed on the liquid crystal display 19 of the operation box 9, and the lead wires on the temporary power supply side and the work side connected to the temporary power supply side connection connector 6 and the work side connection connector 7.
The lead 40 and the lead wire 50 are connected in parallel via the low-pressure bypass switch body 8.

Thereafter, if the secondary side of the working-side transformer is cut off, the load supplied by the working-side transformer is switched to the secondary side of the temporary power-supply-side transformer in parallel without a momentary power failure.

The operation of each switch based on the message on the liquid crystal display 19 is performed after the display lamp 24 is turned on. This means that once one of the switches is operated, the microcomputer starts the calculation, and when the calculation is completed, the display lamp 24 lights up, indicating that the calculated data is being held. Perform the following switch operation.

Next, when an overcurrent flows for some reason while the low-pressure bypass switch is turned on (during operation), the thermal relay 3 operates to open the electromagnetic contactor 1 and the liquid crystal display 19 displays “ "Thermal lip during energization" is displayed, and energization is stopped.

To resume the energization, the thermal relay reset button 36 provided at the lower portion of the low-pressure bypass switch body 8 shown in FIG.
Since "OK" is displayed on the liquid crystal display 19, when the switch 21 is pressed, the power supply is resumed.

If a power failure occurs on the temporary power supply side while the low-voltage bypass switch is turned on (during operation), the electromagnetic contactor 1 is automatically turned on if power is retransmitted within one minute. When the power is retransmitted, the message "Power failure input OK for 1 minute or more" appears on the LCD display 19.
The energization is resumed.

Further, for example, when the temporary power supply side C phase is missing, "missing phase C" is displayed on the liquid crystal display 19, so that the temporary power supply side C phase is checked to secure the connection.

If there is an open phase in the ground phase E phase or e phase, "temporary power supply side E phase open phase" or "work side e phase open phase" is displayed, so the open phase is checked to ensure the connection.

These detection functions are stored in the microcomputer 32 of the control box 4 in advance.

Next, in the case of a single-phase three-wire system, C
Separate the phases c and c of the working side connector, and connect the temporary power supply side connectors A, B and E with the phases a and b of the working side connector.
The temporary power supply side lead wire 40 and the work side lead wire 50 are connected to the phases e and e, and the power distribution system switch 20 is set to a single-phase three-wire system. As in the case of the three-phase four-wire system described above, If the connection is changed according to the message of the liquid crystal display 19, the parallel switching can be performed.

(E) [Effects of the Invention] As described above, in the low-voltage bypass switch of the present invention, the microcomputer 32 of the control box 4 previously stores the voltage and the phase sequence of each power distribution method as a reference for calculation. Is appropriately selected according to the power distribution method of the distribution line to be operated, and the temporary power supply side connector 6 and the work side connector 7 are
If the temporary power supply side lead wire 40 and the working side lead wire 50 are connected, and the connection is changed according to the message of the liquid crystal display 19, it is easy to perform power detection and phase detection, and it is also easy for a voltmeter or There is no misreading or misjudgment of the phaser, and phase compatible connection can be made.

By pressing the closing switch 21 in accordance with the message of the liquid crystal display 19, the working lead 50 can be easily and reliably connected in parallel with the temporary power supply lead 40 without any interruption by turning on the electromagnetic contactor 2.1. The power load on the lead wire 50 can be switched to the temporary power supply side lead wire 40 from the secondary side of the adjacent pole transformer without interruption, and the power can be received completely.

Further, for each power distribution system, the voltage and phase sequence of each power distribution system are stored in advance, and the power distribution system switch 20 can select and calculate the voltage and phase sequence for use.

Furthermore, the electromagnetic contactors 1 and 2 are divided so that the ground phase E phase is an independent three-pole contact. hand,
The ground phase connection is ensured, and safety is ensured to prevent phase detection and operation errors due to poor grounding.

Further, structurally, a one-touch mounting bracket 38 is provided on the back surface of the low-pressure bypass switch body 8, and the receiving bracket 39 is attached in advance to a mounting position of the switchgear body 8 of a utility pole,
By simply hooking the one-touch mounting bracket 38, the mounting can be easily locked, and after the work is completed, the lock can be released and easily removed. Therefore, the work of mounting and removing the power pole is very easy and safe.

Further, since the switch body 8 and the operation box 9 are connected by a connection cable 10 so that they can be remotely controlled, the operation box 9 is attached to an easy-to-operate place away from the low-pressure bypass switch body 8, Since it can be controlled, lead wires 40 to connectors 6 and 7
The connection work between the lead wire 50 and the like is easy and safe.

Furthermore, the connectors 6 and 7 are waterproof one-touch type,
Since the structure is such that the connection is locked, the connection can be easily changed, and the connection does not drop off naturally.

Frames 37 are provided at the upper and lower portions of the switch body 8 to protect the connectors 6 and 7, and a suspension ring 41 is provided at the upper portion of the switch body 8 to lift and lower the switch on a pillar. It has many excellent effects such as measuring stool.

[Brief description of the drawings]

FIG. 1 is a circuit diagram for explaining a low-pressure bypass switch of the present invention,
FIG. 2 is a circuit diagram for explaining the control box, and FIG.
FIG. 4 is an external view of an embodiment of the main body, FIG. 4 is an external view of an embodiment of the operation box, and FIGS. 1, 2 is an electromagnetic contactor, 3 is a thermal relay, 4 is a control box, 5 is an input terminal, 6 is a temporary power supply side connection connector, 7 is a work side connection connector, 8 is a low voltage bypass switch body, and 9 is an operation box. , 10 is a connection cable, 11 is a contact reading terminal, 12 is an operation command terminal, 13 and 14 are solid-state relays, 15 and 16 are magnet coils, 17 is an opening lamp, 18 is a closing lamp, 19 is a liquid crystal display, 20 Is a power distribution system switch, 21 is a closing switch, 22 is an opening switch, 23 is a recalculation switch, 24 is a display lamp, 25 is a buzzer, 26 is a microcomputer, 27 is a connector, 28 is a ground terminal, 29 is a fan,
30 is a voltage divider circuit, 31 is an analog / digital conversion board, 32
Is a microcomputer, 33 is an input / output board, 34 is a communication board, 35 is a power supply circuit, 36 is a thermal relay reset button, 37 is a frame, 38 is a one-touch mounting bracket, 39 is the same mounting bracket, 40 is a temporary power supply side lead wire, 41 is the suspension ring, 50 is the work side lead wire

Claims (2)

(57) [Claims] An ungrounded and grounded temporary power supply side connector to which each lead wire from the temporary power supply side is connected, and a non-grounded and grounded connector to which each lead wire from the working side load is connected. Each electromagnetic contactor 1 and thermal relay inserted in series between each non-grounding temporary power supply side connector and each non-grounding working side connector; The electromagnetic contactor 2 inserted between the temporary power supply side connection connector and the grounding work side connection connector, and the voltage and phase sequence of each temporary power supply side connection connector and each work side connection connector for each power distribution system. Storage means pre-stored; selecting means for selecting any one of various power distribution methods; detecting voltage and phase sequence of each temporary power supply side connector to which each lead wire from the temporary power supply side is connected; Each load from the work side load. Voltage phase sequence detecting means for detecting the voltage and phase sequence of each working side connector to which the power line is connected, and reading each voltage and each phase sequence for the power distribution system selected by the selection device from the storage device, Each voltage and each phase sequence read from the means are compared with each voltage and each phase sequence detected by the voltage phase sequence detecting means, and each lead wire from the temporary power supply side and each temporary power supply side connector are connected. A computing means for obtaining a series of work procedures for changing the connection, and a series of work procedures for changing the connection between each lead wire from the work side load and each work side connector, from the temporary power supply side obtained by this calculation means A series of work procedures to change the connection between each lead wire and each temporary power supply side connection connector, and a series of work procedures to change the connection between each lead wire and each work side connection connector from the workload side. A low-pressure bypass switch comprising: a display screen displayed by a signal; an input means for inputting the electromagnetic contactor 2 and thereafter inputting each electromagnetic contactor 1; and an instruction means for instructing activation of the input means. 2. A low-voltage bypass switch body and an operation box are divided and connected via a cable. The low-voltage bypass switch body has a temporary power supply side connection connector, a working side connection connector, and an electromagnetic connection. A contactor 1, an electromagnetic contactor 2, storage means, voltage phase sequence detecting means, calculating means, and input means are provided, and an operation box is provided with a selecting means, a display screen, and an instruction means. The low-pressure bypass switch according to item (1).