JP2607928B2 - Transformer uninterruptible replacement equipment for high voltage instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for replacing a power transformer for a high-voltage power receiving consumer with an uninterruptible power supply and measuring a power load.
The present invention relates to an uninterruptible replacement device that can be implemented.

[Conventional technology]

Meter transformers for power reception by high-voltage power receiving consumers need to be replaced periodically for verification after expiration of their validity period, but in the past, replacement was performed due to power outage work.

However, recently, the equipment used by consumers has been automated and controlled online, and the use of computers has increased,
The situation is such that instantaneous power outages as well as power outages are not allowed, and liveliness work must be performed.

In fact, in the construction of distribution lines, transformer cars and generator cars are used, and work is being performed while supplying power to customers in the construction area without power interruption during construction.

However, in the case of replacement of instrument transformers, the number of installations is large and replacement is also limited to the customer, so using transformer cars and generator cars is excessively expensive and uneconomical in terms of equipment, and high voltage. Since the number of customers is large, there are inconveniences such as not being able to respond.

In addition, it is necessary to measure the amount of electric power used during the replacement work. However, transformer cars and generator cars usually do not require measurement, so that they cannot be measured.

Therefore, there is a need for a more compact uninterruptible replacement device for replacing an instrument transformer.

[Problems to be solved by the invention]

The present invention has been developed in response to such a demand,
Replacement of the instrument transformer for high-voltage power reception is switched to parallel without interruption by power detection, phase detection, and parallel switching to the bypass circuit without instantaneous power failure of the power load deepened in the instrument transformer. Moreover, the present invention provides an uninterruptible replacement device for a transformer for a high-voltage instrument, which can measure a power load even during a replacement operation.

[Means for solving the problem]

As shown in FIG. 1, between a power supply side connector 1 and a load side connector 2, a high voltage switch 3 and an instrument transformer 4 are connected.
・ 6 are connected to V connection respectively, and the power supply PT7 is connected to the power supply side of the high voltage switch 3, and the secondary side of each PT5 ・ 6 ・ 7 is connected to the function of power detection, phase detection, display display and high voltage A switch operation function is connected to the control unit 8 and the meter transformer 4 is connected to the watt-hour meter 9. It is of a structure that enables the replacement of the instrument transformer for use while measuring the power load.

In addition, as shown in FIG.
It is composed of a high-voltage switch operating circuit 12 and a microcomputer section. The microcomputer section is an A / D conversion circuit 13 for sequentially reading the secondary voltages of the four PTs 5 and 6 for voltage detection.

Phase detection switch 33, closing switch 31, and release switch
A PIO 15 for parallel input / output of a reading circuit 18 for a contact 32 of the high-voltage switch 3 and a data storage circuit 14 at the time of a power failure and a display 34.

An interrupt circuit 16 that can detect a power failure and generate an interrupt.

In addition, it comprises a CPU 17, a ROM 10, a RAM 20, and the like.

[Operation] [Example] In order to use the transformer-uninterruptible replacement device for a high-voltage meter according to the present invention, for example, as shown in FIG. 1 and FIG. The power supply side connector 1 is equipped with a high voltage switch 21
The power supply side cable 23 connected to the power supply side lead wire 27 by the lead connector 22 is connected, and then the load side lead wire of the high voltage switch 24 in the cupicle is connected.
The load side cable 26 connected to 28 by the high voltage connection clamp 25 is connected to the load side connector 2.

Next, when the phase detection switch 33 of the device is pressed, the voltage detection PT
The four voltages on the secondary side of 5.6 are sequentially converted by the A / D conversion circuit 13.
The microcomputer calculates the voltage and phase on the high voltage side from the A / D converted waveform data, and determines whether or not the voltages applied to the high voltage side connector 1 and the load side connector 2 are compatible.

Display "OK OK" if it is compatible 34
To be displayed.

If there is an open phase on the high pressure side, for example, if the load side U phase is open on the display 34, an open phase display such as "load side U phase open phase" is displayed.

If they do not match, the replacement indication of the load-side connector 2 is displayed in accordance with the non-conformity state as “Replacement U ← → V”, “Replacement V ← → W”, “Replacement U ← → W”, “Replacement U → V → W →
U, and one of the five types of exchanges, that is, exchange U → W → V → U, is displayed on the display 34.

After replacing the load-side connector 2 according to the display on the display 34 and pressing the phase detection switch 33, "input OK" is displayed on the display 34.

After confirming the display of "OK" and pressing the closing switch 31, the closing coil 35 operates and the high-voltage switch 3 is turned on.
The display 34 shows "ON" and the red indicator light 37 is turned on, thereby forming a bypass circuit between the power supply lead 27 and the load lead 28 shown in FIG.

Next, the high pressure switch 21 on the pole and the high pressure switch in the cupicle
When the 24 is opened, the instrument transformer 40 in the cupicle becomes non-charged, and is replaced with a new instrument transformer.

Therefore, even during the replacement work, the power supply to the power load is supplied from the bypass circuit without a momentary power failure and is measured by the wattmeter 9 of the present apparatus.

After the replacement of the instrument transformer 40 is completed, after the pole high-voltage switch 21 is turned on, the voltage between the power supply side and the load side terminals of the high-voltage switch 24 in the cuppicker is checked by voltage detection and phase check. Then, the high-voltage switch 24 is turned on and paralleled.

The open switch 32 of the apparatus is pressed to operate the open coil 36, and the high-voltage switch 3 is opened. On the display 34, a green indicator light 38 lights up together with the message "Opened."

Next, the lead connector 22 and the high voltage connection clamp 25 are removed from the power supply side lead wire 27 and the load side lead wire 28, respectively.

As described above, the instrument transformer 40 can be replaced without any momentary power failure and without any power failure while measuring the amount of power supplied during the construction.

If the power supply is interrupted while the high-voltage switch 3 is turned on, a power-off signal is applied to the "interrupt circuit 16" shown in FIG. 2 to interrupt the microcomputer. The switch 3 is forcibly opened.

This is because if the high-voltage switch 3 is turned on and moved to another place and the phases of the power supply and the load are incorrectly connected, a high-voltage short circuit will occur. The structure for opening the switch 3 is intended for safety.

In addition, in the case where power is retransmitted after a power failure during the work, if the power failure occurs within a certain period of time, it is possible to return to the power-on mode or the initial mode according to the judgment of the operator.

〔The invention's effect〕

The high-voltage instrument transformer uninterruptible replacement device of the present invention, when replacing the instrument transformer 40 of the high-voltage receiving customer, the power receiving circuit of the instrument transformer 40, a high-voltage bypass circuit, a power detection and
After switching without interruption by inspection / parallel switching, the instrument transformer 40
The power receiving circuit is opened by the pole switch 21 and the high voltage switch 24 to make it in a no-voltage state and the replacement work is performed, so it is safe, and the power supply to the load is instantaneously interrupted by the high voltage bypass circuit. Since the power is supplied without performing the power supply, it is possible to easily respond to the demand for the uninterruptible power supply to the power load which has been strongly demanded recently.

Further, since the amount of power supply can be measured during the operation, troublesome operations such as the evaluation of the amount of power supply during the operation can be omitted later.

Further, since it can be configured to be relatively compact, it can be mounted on an automobile and has many excellent effects such as being convenient to carry to the site.

[Brief description of the drawings]

FIG. 1 is a circuit diagram for explaining the present invention, FIG. 2 is a block diagram for explaining a control unit of the present invention, and FIG. 1 is a high voltage side connector, 2 is a load side connector, 3 is a high voltage switch, 4 is an instrument transformer of the present apparatus, 5.6 is a voltage detection PT, 7 is a power supply PT, 8 is a control unit, 9 is Watt hour meter, 10 is the ROM of the control unit, 11 is the same power supply circuit, 12 is the operation circuit of the high voltage switch 3, 13 is the A / D converter circuit, 14 is the data storage circuit at the time of power failure, 15 is the PIO, 16 is an interrupt circuit, 17 is a CPU, 18
Is a reading circuit of a phase detection switch 33, a closing switch 31, an opening switch 32, and a contact 39 of the high-voltage switch 3, 21 is a high-voltage switch on a pole, 22 is a lead connector, 23 is a power supply side cable, and 24 is a high voltage in the cupicle. Switch, 25 is a high-voltage connection clamp, 26 is a load-side cable, 27 is a power-supply-side lead, 28 is a load-side lead, 31 is a closing switch of the high-voltage switch 3, 32 is an opening switch, and 33 is a phase detection switch. , 34 is the display, 35 is the input coil of the high voltage switch 3, 36 is the open coil, 37 is the red indicator light, 38 is the green indicator light, 39 is the contact of the high voltage switch, 40 is the instrument transformer in the cupicle vessel.

Claims (2)

(57) [Claims] 1. A high-voltage distribution line, a power supply-side lead wire 27, a pole high-voltage switch 21, and an instrument transformer 40 in a cubicle.
At the power receiving equipment of the high-voltage receiving customer who is supplied with power by the high-voltage switch 24 and the load-side lead wire 28 in the kyupicle, when replacing the instrument transformer 40 in the kyupicle without interruption, A power supply cable 23 having a lead connector 22 and a connector that can be connected to the power supply connector 1 at the other end, and a high voltage connection clamp 25 at one end of the cable and can be connected to the load side connector 2 at the other end. A load-side cable 26 having a connector, and a PT5 for voltage detection on the power supply side, a PT6 for voltage detection on the load side, a PT7 for power supply of the control unit 8, and an instrument transformer 4 of the present apparatus for a watt hour meter. ,
It has a closing coil 35, an open coil 36, a high-voltage switch 3 having a contact 39, and a control unit 8 for controlling the device. An external panel unit has a power supply side connector 1, a load side connector 2, a phase detection switch 33, a closing Switch 31, Open switch 32, Red indicator light 37, Green indicator light 38, Display 34, Transformer for high-voltage instrument having watt-hour meter 9 When replacing 40, connect the power cable 23 connector to the power connector 1
To the power supply side lead wire at the other end.
27, the connector of the load-side cable 26 is connected to the load-side connector 2, the high-voltage connection clamp 25 at the other end is connected to the load-side lead wire 28, and the closing switch 31 is pressed. The high-voltage switch 3 is turned on, and a bypass circuit is formed for the instrument transformer 4 in the apparatus and the instrument transformer 40 in the cubicle. In addition to being able to perform work without power outage to the customer, the metering values of both integrating wattmeters are added together during the bypass time, and the metering values are read in the case of a single system, so that the transformer for instruments in the kyupicle can be read. An uninterruptible replacement device for transformers for high-voltage meters, which can accurately measure the amount of load power regardless of the replacement of 40 units. 2. The uninterruptible power transformer according to claim 1, wherein the control unit 8 performs A / D conversion of each phase voltage by the voltage detection PTs 5, 6 and calculates and processes by the microcomputer unit. By pressing the phase detection switch 33, the control unit 8 determines whether parallel switching is possible or not based on the voltage absolute value and the voltage phase of each phase, displays the result on the display, and displays the closing switch.
By pressing 31, the high-voltage switch 3 in the high-voltage instrument transformer uninterruptible replacement device is turned on, and the red indicator light 37 and the display display confirm that the high-voltage switch 3 is turned on.
At the end of the work, by pressing the open / close switch 32, the high-voltage switch 3 in the high-voltage instrument transformer uninterruptible replacement device is opened, and the green indicator light 38 and the display of the display indicate
An uninterruptible replacement device for transformers for high-voltage meters, which can be checked for operation and the progress of operation can be checked on the display.