WO2010059014A2

WO2010059014A2 - Distribution board with panel transformer

Info

Publication number: WO2010059014A2
Application number: PCT/KR2009/006936
Authority: WO
Inventors: 정운태
Original assignee: Chung Woon Tae
Priority date: 2008-11-24
Filing date: 2009-11-24
Publication date: 2010-05-27
Also published as: WO2010059014A3; KR20100058305A

Abstract

The present invention is a distribution board with a panel transformer, comprising: a panel transformer, plural panel transformation units, a low voltage distribution board, a current transformer and a control unit, wherein the panel transformer includes a high voltage circuit-breaker for a power line, a transformer, and a low voltage circuit-breaker. The high voltage circuit-breaker for a power line is connected to external supply high voltage power. The transformer boosts supplied high voltage power passing through circuit breakers of branch power lines, and transforms high voltage power into low voltage power to supply power to a load. The low voltage circuit breaker is connected to a lower circuit breaker and a low voltage cable which are installed at the low voltage side of the transformer, and enables the connection and disconnection of low voltage supplied from the transformer with the load. The plural panel transformation units are configured through connection with the high and low voltage circuit breakers and the transformer wherein the high voltage circuit breaker supplies and cuts off power to the panel transformer. The low voltage distribution board is connected to low voltage power through low voltage cables, wherein low voltage power is supplied from the low voltage circuit breaker of each panel transformer that constitutes the panel transformation unit. The current transformer is installed at high and low voltage circuit breakers, and detects strength of the load current flowing in the cable connected to the high and low voltage circuit breakers. The control unit operates the high and low circuit-breakers by comparing the current strength detected by the current transformer with preset standard data value to enable connection or disconnection of each panel transformer with the load depending on the load variation. Therefore, the control unit is able to control the operating number of panel transformers.

Description

Panel transformer switchboard

The present invention relates to a panel transformer switchgear, and more particularly, in a panel transformer switchgear for supplying a load by lowering it from ultra high pressure or extra high pressure to high pressure or low pressure, the panel transformer having the same load characteristics regardless of the transformer type and capacity. Accordingly, the present invention relates to a panel transformer switchgear capable of automatically controlling the number of driving units to reduce load and no load loss.

In the general transformer capacity selection method, since the specific load capacity is not calculated at the time of design and construction, the transformer capacity is calculated in consideration of the building power load density table and the building floor area, and then the standard capacity is calculated using the transformer standard capacity calculation table. 3, 5, 7.5, 10, 15, 20, 30, 50, 75, 100 (KVA), whether single phase or three phase. … Although it is standardized by a customer, it is possible to purchase and install any non-standard product according to the demand of the customer.

On the other hand, the specific capacity of the transformer can be used to determine whether Even if it is calculated, the devices used in the building, such as electric lights, computers, washing machines, and small power equipment, are composed of high efficiency devices these days, and when the capacity of the transformer is excessive, one of them or at least parallel operation is performed. In order to reduce the losses, parallel operation was practically difficult due to different transformer capacity and load characteristics.

Therefore, there was a problem that the employer had difficulty in managing the company due to the increase in the installation area and installation cost, and the increase in the electricity charge due to the increase in the load loss caused by the operation of the transformer by load.

1 is a view showing an embodiment of a disconnection diagram according to the prior art, which will be described below with reference to the description of the reference numerals of the main parts of the drawings.

As shown in the figure, in the disconnection diagram according to the prior art, an interlook is set between a light load transformer, a power load transformer, and a computer load transformer 30, and a tie van is installed. In the event of a transformer failure, the faulty transformer is separated from the track, and then the interlock is artificially released, and then the low voltage circuit breaker 246 is input to load the load on the faulty transformer together with other transformers to install the load for temporary use.

Therefore, such a configuration has a problem in that the efficiency of equipment is inferior, such as energy saving due to the control of the number of driving considering the actual load or the parallel operation compared to the installation area and the installation cost.

In addition, since a single load is applied to a certain load, even if the load is low or high, it can only be used as it is installed. Even when a very small load is caught on the transformer, the transformer is connected to the line, resulting in no load loss. If a large load is applied to an individual transformer in an individual operation state, there is a problem that the load loss increases. This means that the loss generated by the transformer increases in proportion to the square of the load factor, and the transformer using silicon steel sheet and the transformer using amorphous or micronized steel sheet according to the type of transformer (new material, insulation method) have the same capacity and the same load. This is because the power conversion efficiency is different.

In addition, in order to prevent voltage fluctuations, harmonics or noises of customers, large buildings are classified and installed such as light and heat, power, air conditioning, emergency load, elevator, computer, electric transformer, and special load transformer. As the installation number and installation area of the transformer increase, the installation cost and maintenance cost increase, and the above elements have a problem that the building manager has to provide a limited element in the building management.

The present invention was created to solve the problems of the prior art as described above, an object of the present invention is to install a plurality of panel transformer having the same load characteristics irrespective of type or capacity, current transformer for sensing the amount of load current When the high voltage or low voltage circuit breaker is operated in accordance with the signal electrically connected to the controller, the average load is 70 (%) when the panel transformer logarithmic control operation under heavy load is installed. ) If the power transformer is 30 (%) and the computer transformer is 40 (%), all of them are operated in parallel or if the load is reduced, only one unit is operated to reduce the load and no load loss. It aims to provide.

In addition, in the present invention, when the large-capacity transformer is operated in parallel, the breaking capacity of the low voltage circuit breakers installed in the load stage is increased by the number of transformers operated in parallel. It is an object of the present invention to provide a panel transformer switchgear that can facilitate selection of the load side breaker by reducing the breaking capacity by operating the tie-ban breaker before other breakers to increase the line impedance by separating the lines. .

In addition, the present invention, when calculating the transformer capacity of the consumer in the design stage, when calculated as three, such as electric light transformer, power transformer, computer transformer, etc., the installation of the transformer to prevent the load characteristics and installation area and voltage fluctuation or harmonic generation of the customer In addition to reducing load loss and installation costs by reducing or increasing the number of units, customers who have already installed and used transformers can replace the old or oversized transformers with high-efficiency transformers to carry out energy saving projects (ESCO). Another object is to provide a panel transformer switchgear with adjustable number of installations.

Panel transformer switchgear according to an embodiment of the present invention for realizing the above object is a high-voltage power circuit breaker connected to the high-voltage power source that is drawn from the outside, the high-voltage power supply is passed through the branch high-voltage circuit breaker is pulled down to low voltage power supply A panel transformer comprising a transformer for supplying electric power to a load side, a low voltage circuit breaker and a low voltage cable installed at the low voltage side of the transformer, and a low voltage circuit breaker for connecting or disconnecting the low voltage power drawn from the transformer to the load; A plurality of panel transformer units connected to the transformer and the low voltage circuit breaker forming a high voltage circuit breaker and a panel transformer to supply or cut off power to the transformer; A low voltage distribution panel connected to a low voltage power supply drawn by a low voltage breaker of each panel transformer forming the panel transformer; A current transformer installed on the high and low voltage blocking base to sense an amount of load current flowing through a cable connected to the high and low voltage breakers; And a control unit for controlling the number of operation of the panel transformer by comparing the amount of current detected by the current transformer with a preset reference data value to operate each of the high and low voltage circuit breakers to connect or disconnect each panel transformer from the load according to the load change. It is characterized by comprising;

As a preferable feature of the present invention, instead of installing a plurality of transformers for each load type and application, it is possible to reduce the number of transformer installations, increase the capacity of individual transformers and reduce the load loss by parallel operation, and to suppress harmonics or voltage fluctuations. In the existing customers using electricity, the energy saving project is carried out by adjusting the installed capacity and quantity of the transformer, and selecting the capacity and number of transformers with the least loss for the customer.

As a preferable feature of the present invention, a controller using a general computer, a power protection monitoring device, a concentrated display device, a protocol converter, or the like, or a maximum demand meter (DEMAND METER), which is commercially available in the market, may be configured with a preset current value detected by the current transformer. It is to perform the function of separating or connecting the transformer from the line by controlling the circuit breakers before and after the transformer compared with the reference value.

As a preferred feature of the invention, the high-voltage circuit breaker, a gas (SF6) circuit breaker or vacuum circuit breaker that is installed in front of the transformer for inputting and separating high-voltage power to the transformer; The low voltage circuit breaker includes an air circuit breaker that connects or cuts off the secondary low voltage power supply of the transformer.

As another preferable feature of the present invention, the transformer is composed of a single phase or three phase, and even if the transformer capacity is different, it has the same load characteristics.

As another preferable feature of the present invention, the load characteristic is that the polarity, the primary and secondary voltage, the ratio of resistance and reactance, the angular displacement, the phase rotation direction, the impedance voltage has the same characteristics.

Another desirable feature of the present invention is to install transformers according to the past load types and uses in consideration of the effects of harmonics or voltage fluctuations generated in the load on other loads, but the above elements can be suppressed by increasing the transformer capacity. Therefore, it is desirable to increase the transformer capacity whenever possible.

As another preferable feature of the present invention, when it is determined that the transformer capacity for parallel operation is excessive or there is a problem in selecting the low voltage circuit breaker breaking capacity installed at the load stage due to the large number of installation units, a tievan is installed and a separate current transformer is installed at the load stage. If the detected current is more than a certain value by operating the tie breaker before other breakers, if the line is separated, the short-circuit current supply is reduced, the line impedance is doubled, and the short-circuit current is reduced by half. Advantages It is desirable to apply a system separation scheme to facilitate interruption.

As another desirable feature of the present invention, even if the high-efficiency transformer, which is recently shipped, is installed without considering the load factor of the customer, the load loss increases at light load, resulting in an increase in the overall electric charge. It is desirable to select the transformer type and capacity in consideration of the load factor of the power factor to contribute to reducing the power loss of the customer.

As another preferred feature of the present invention, the panel transformer unit is connected in parallel with a plurality of high-voltage power introduced from the outside, or branched from the high-voltage power supply drawn from the high-voltage circuit breaker for receiving.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, the terms or words used in the present specification and claims should not be interpreted in the ordinary and dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain the invention of their own. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

The panel transformer switchgear according to the present invention has the effect of reducing the electric charge by reducing the load loss or no load loss by installing a plurality of panel transformer switchgear having the same load characteristics.

In addition, according to the present invention, it is possible to omit the tie board or to reduce the number of installation by installing a panel transformer switchgear to reduce the installation area and installation cost.

In addition, by installing transformers by load type and purpose, the number of installations is largely reduced, thereby reducing the installation area and installation cost, and increasing the capacity of the transformer for parallel operation to prevent voltage fluctuations or harmonics.

In addition, according to the present invention, as the use of high-efficiency devices in the consumer increases, the remaining capacity of the transformer, or the power used in different time zones, i.e., a lot of load in the morning in a business hotel, and a lot of load in the evening time in a general hotel The low-load consumer panel transformer is separated from the line, and the high-load consumer panel transformer is put on the line, allowing balanced distribution of power in KEPCO, thus saving additional installation costs for KEPCO transmission and distribution lines. It can be effective.

In addition, according to the present invention there is an effect of extending the life of the expensive transformer by preventing the overload phenomenon that the load of a single transformer is a lot and the life of the insulation is shortened by the temperature rise.

In addition, according to the present invention, a plurality of consumers of a certain size or more, that is, a general lamp, a heat transformer, an emergency light, a heat transformer, a computer transformer, a power transformer 1/2, a cooling transformer, a landscape and stage lighting transformer, a stage sound and a mechanical and visual transformer When transformers are installed, similar loads are tied together in parallel operation, and if they are tied together in parallel operation, loads that are considered to affect other loads are separated and an interlook is installed between transformers in parallel operation. It is possible to operate the logarithmic control by automatically canceling and setting the interlock.

In addition, according to the present invention, when the transformer is operated in parallel, impedance is reduced, voltage fluctuations are suppressed, and the voltage and frequency are constant, that is, the effect of supplying high-quality power to the load, which extends the life of various high-tech devices sensitive to noise, surge and voltage fluctuations. It is effective.

In addition, according to the present invention there is an effect that can reduce the maintenance cost by carrying out the Esco project (energy saving business) if the maintenance cost of water and substation equipment is already installed.

In addition, according to the present invention, the panel transformer of the customer with less load is separated from the line, and the short circuit capacity is reduced, so that the operation responsibility of the breaker of the KEPCO transmission line is easy, so that the KEPCO breaker circuit breaker is reliably shut off in the past 2003. It has the effect of preventing a major blackout, such as that caused in the US in August.

1 is a diagram showing a disconnection connection diagram according to the prior art;

2 is a representative disconnection wire diagram for installing a panel transformer capable of parallel operation according to an embodiment of the present invention;

3 is a disconnection diagram showing a modified embodiment of FIG. 2 with a panel transformer capable of parallel operation;

Figure 4 is a disconnection diagram according to an embodiment of the present invention to reduce the installation area and the installation cost, and to install a tie-down in preparation for the occurrence of a short circuit and ground fault in consideration of the low-voltage circuit protection method to break the failure section Disconnected wiring diagram showing a modified embodiment of Figure 2 applying a system separation method to easily block,

5 is a disconnection diagram for supplying stable power to a load by operating in parallel according to the voltage according to the present invention.

FIG. 6 is a disconnection diagram illustrating a modified embodiment of FIG. 2 in which a transformer is separately installed so as not to be influenced by noise and surge caused by a panel transformer in a slight manner. FIG.

Hereinafter, the panel transformer switchboard according to the present invention with reference to the accompanying drawings.

First, it should be noted that like elements or parts in the drawings are denoted by the same reference numerals as much as possible. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted in order not to obscure the subject matter of the present invention.

2 is a diagram illustrating a disconnection connection diagram including a panel transformer switchgear according to an exemplary embodiment of the present invention.

As shown therein, the panel transformer A according to the present invention is composed of a transformer 130 and a low voltage circuit breaker 146. The panel transformer A has a load characteristic even if the transformer 130 has a capacity or a different capacity. Is characterized by having the same. Here, even though the capacity is different, the same load characteristics means that even transformers with different capacity can be operated in parallel. In this case, the load characteristics must be the same. In this case, the load characteristics for parallel operation, that is, polarity ( ), The primary and secondary voltage, the ratio of resistance and reactance, the angular displacement, the phase rotation direction, and the impedance voltage should be the same, but in the case of impedance voltage, the ratio (%) to the rated voltage is called percent impedance voltage. Even though the transformer load sharing is different, parallel operation is possible. Therefore, the term panel transformer (A) includes a low voltage circuit breaker 146 at the load stage for the purpose of understanding, or a transformer 130 capable of parallel operation having the same load characteristics. It is defined as

The panel transformer A may be implemented by a general transformer 130 that is commercially available, that is, a known technique.

Here, the high voltage circuit breaker 120-1 may be used as a gas circuit breaker or a vacuum circuit breaker, a gas circuit breaker or a vacuum circuit breaker may also be used as a branch high pressure circuit breaker, and as a low

pressure circuit breaker

146, 147, a general air circuit breaker. , A circuit breaker or a magnetic circuit breaker may be used, but when the secondary voltage of the transformer is high, that is, as shown in FIG. 5, the circuit breaker 1200 such as the primary side may be used as the secondary circuit breaker 120 of the transformer 1300. ) Can be used.

That is, as shown in Fig. 2, in the existing water and substation facility customer, that is, when using a transformer in a series operation method as shown in Fig. 1, and installing a transformer capable of parallel operation by applying the present invention Comparing the loss in the case of using, the three panel transformer 130 is a high efficiency low noise transformer (laser mold transformer,% Z (mean% impedance) equal, less than, equal to the total loss) 1,000, 1,250, 750 ( KVA) When three units are installed or when an amorphous mold transformer is installed, that is, the load applied is considered to be the same, and the average load applied to each transformer is 70 (%), 30 (%), 40 ( %), And overtime (15H) is said to take 10 (%), 5 (%), and 3 (%). When comparing them, referring to FIG. 1, the loss that occurs when operating in series in FIG. During working hours, it becomes 4.804 (KW / H), 2.312 (KW / H), 2.196 (KW / H) The total loss is 83.781 (KW / 9H), and the working hours outside are 1.616 (KW / H), 1.717 (KW / H), and 1.305 (KW / H), and the total daily loss is 69.57 (KW / 15H). The total daily loss is 153.35 (KW / day), and the annual loss is 4.638 (assuming that 250 days are 365 working days and 365 days are public holidays, and outside work hours are equal to holidays and loads, 4.638 ( KW / day) x 24 (H) x 115 (day) = 12,800 (KWH / year), and on working days 153.37 (KW / day) x 250 (day) = 38,337 (KWH / year), resulting in an annual loss of 51,137 (KWH / year), but in FIG. 2, when the three units are operated in parallel during the working hours in the case of installing them in parallel, that is, when a high efficiency low noise transformer is installed, the average load becomes 45.834 (%) to 2.945. (KW / H) x 3 units will be 8.835 (KW / H) and the total loss will be 79.515 (KW / 9H). 1.777 (KW / H) The net total will be 26.655 (KW / 15H), and the total daily loss will be 106.17 (KW / day). The annual calculation will include 250 out of 365 days as 115 working days and public holidays and loads outside of working hours. Assuming the same, the loss on a holiday would be 1.777 (KW / H) x 24 (H) x 115 (day) = 4,904 (KWH / year) and 106.17 (KWH / day) x 250 (day) = 26,542 The annual loss is 31,446 (KWH / year), and the annual energy savings is 19,691 (KWH / year).

Therefore, assuming that the domestic customer has 300,000 or more of KVA or more, the total annual power saving is 5,907,300,000 (KW), and the average electricity rate is 90 (KRW, average price in 2009). For general use, select I. High-pressure A (one of the electric bill type and additional cell included), 5,316 billion won is the amount saved in a year simply by changing the operation method.

Further, even when the three transformers 30 used in the embodiment of FIG. During working hours, 5.462 (KW / H), 1.711 (KW / H), 1.879 (KW / H) will be 81.468 (KW / 9H), and the daily loss will be 0.748 (KW / H), 0.827 ( KW / H), 0.543 (KW / H), and the total daily loss is 31.77 (KW / 15H), and the total daily loss is 113.238 (KW / day), which is 250 days out of 365 days. If 115 days are counted as a public holiday and assuming that the working hours are the same as the public holiday outside of working hours, the loss on a holiday is 2.118 (KW / day) x 24 (H) x 115 (day) = 5,845 (KWH / year). There is 113.238 (KWH / day) x 250 (day) = 28,309 (KWH / year), resulting in an annual loss of 34,154 (KWH / year). In other words, if they are installed as an amorphous mold transformer, the average load of three transformers is 45.834 (%) during working hours, and 2.713 (KW / H) x 3 is 8.139 (KW / H), and the total loss is 73.251 (KW / 9H), and there is little load outside working hours, so if you drive only one, it will load 18.5 (%) and the loss will be 0.986 (KW / H), and the total loss will be 14.79 (KW / 15H). If the total daily loss is 88.4 (KW / day), and the year is calculated, 250 days are 365 working days and 115 days are public holidays. / H) x 24 (H) x 115 (day) = 2,721 (KWH / year), and on working days 88.4 (KWH / day) x 250 (day) = 22,100 (KWH / year), resulting in an annual loss of 24,821 ( KWH / year) and the annual energy savings is 9,333 (KWH / year).

Therefore, when calculated as described above, the annual electric charge of about 253 billion won (W) is reduced only by parallel operation, reducing the number of operation of the transformer to operate in parallel as described above, that is, if installed in two as shown in FIG. A lot of energy will be saved.

The energy saving principle as described above reduces the power conversion loss generated during power conversion by lowering the average load ratio in parallel operation by using the principle that the load loss generated in the transformer increases or decreases in proportion to the square of the load current. It is a principle to save energy by controlling the operation number of transformer by using the characteristic of saturation magnetic flux density.

Figure 3 is a preferred embodiment according to the present invention when the load increase of the customer is not expected, or if some load is expected to be closed in the future, or because the current transformer utilization rate is low in Korea, there is a lot of room for the purpose of reducing losses Since the transformer capacity is 3,000 (KVA), it is installed as 750, 750, 750, 750 (KVA) and the interlock is automatically released in the middle of the day when the load is low, and only one unit is operated. It is installed for the purpose of reducing load loss by parallel operation.

In this case, if we consider the current transformer utilization rate in Korea, we can expect to reduce the electricity base rate by stopping some transformers and terminating the contract.

In addition, in FIG. 3, the tievan may be installed, and in this case, the low voltage circuit breaker 246 for the tievan may be installed considering at least the capacity of two transformers operated in parallel.

4 is the sum of the capacity of the electric light, power, computer load transformer 30 is 3,000 (KVA), so it is installed as 1,500 (KVA) x 2, the electric equipment of the existing consumer as shown in Figure 1 energy saving business This is an example of how to apply it.

When installed as described above, in the case of an amorphous mold transformer or a high efficiency low noise mold transformer, much energy can be reduced as in the above example.

4 is also preferably used in a place where there is a high power load in the customer and a lot of voltage fluctuation or harmonic generation.

Figure 5 is an embodiment of the present invention is a commercially available transformer is a two-wound transformer, that is, a two-wound transformer (1400) having two primary and secondary windings occupy most of the large-scale faucet facilities, that is, large-scale intelligence In high-rise buildings and intake stations, the high-voltage (154KV, 345KV) voltage received from KEPCO is connected to a large-capacity faucet transformer, which is a high-capacity transformer that transforms the primary into 154 (KV), the secondary into 22.9 (KV), and the tertiary into 6.6 (KV). In this case, since the three winding transformer 1300 is used, not only the three winding transformers 1300, but also the parallel operation of the three winding and the two winding transformers are possible as in the embodiment, and the reason for the parallel operation as described above is 6.6 ( The load received by KV) voltage is usually a large load such as a large capacity induction motor or a furnace. Close the outlet valve, check the transformer and equipment inside the panel for failures, and check the failure of many large motors, pumps, etc., and open the discharge valve to start the engine. Not only this, but it takes a long time for the tap water to be pressurized again and transported to the water purification plant normally, and it takes much more time for the purified water to go to the consumer. It is desirable to operate these power supplies in parallel to supply water without any problem even if one transformer breaks down.

In intelligent buildings or large hospitals, two or more external receiving power and consumer transformers can be used in parallel operation for stable power supply rather than reducing load loss.

Therefore, as discussed above, since the parallel operation method using a high efficiency transformer is less loss and the facility cost and installation area are reduced than the transformer series operation method, it is preferable to install the system in parallel operation by applying this example from the time of installation of the facility.

According to FIG. 6, when the electric lamp electric heating and the general power computer transformer 130 are operated in parallel and the stage video sound transformer 131 is operated in parallel, there is a concern that operational problems may occur due to noise, surge, etc. of other transformers 130. Or, if there is a special reason to be installed separately, separately installed and operated, but the transformer 131 is installed separately from the transformer 130, the load of the transformer 131 is light load when parallel operation is possible Alternatively, when it is determined that there is no influence of noise or the like under no load, and the other transformer 130 takes a large load and the transformer 131 is a light load, the air circuit breaker 146 is operated by releasing the interlock setting by a signal sent from the controller. It is preferable to use all of them in parallel operation to reduce the load loss.

In addition, according to FIG. 6, when a light load is applied to the stage video acoustic transformer 131, the interlock of the air circuit breaker 146 is released to block the air circuit breaker 145 in the parallel operation state, and the high voltage circuit breaker 121 is turned off. It is preferable to cut off the transformer 131 from the track and use it for the purpose of reducing no-load loss.

In FIG. 6, two current transformers are preferably installed to detect bidirectional currents flowing to the left and right of the air circuit breaker 146 for setting the Tai-Ban inter look.

The present invention has been described with reference to specific embodiments of the present invention, but it is apparent that various modifications and changes can be made as described above without departing from the technical spirit described in the claims of the present invention. Therefore, the detailed description and the accompanying drawings of the present invention should be construed as illustrative rather than limiting the technical spirit of the present invention.

Claims

In the switchboard,

A power receiving high voltage circuit breaker connected to an external high voltage power supply, a high voltage power supply which has passed through the branched high voltage circuit breaker is stepped down, drawn out to a low voltage power supply, and used to supply power to a load side; A panel transformer connected to the low voltage circuit breaker and the low voltage cable, the panel transformer comprising a low voltage circuit breaker for connecting or disconnecting the low voltage power drawn from the transformer to the load;

A plurality of panel transformer units connected to the transformer and the low voltage circuit breaker forming a high voltage circuit breaker and a panel transformer to supply or cut off power to the transformer;

A low voltage distribution panel connected to a low voltage power supply drawn by a low voltage breaker of each panel transformer forming the panel transformer;

A current transformer installed on the high and low voltage blocking base to sense an amount of load current flowing through a cable connected to the high and low voltage breakers; And a control unit for controlling the number of operation of the panel transformer by comparing the amount of current detected by the current transformer with a preset reference data value to operate each of the high and low voltage circuit breakers to connect or disconnect each panel transformer from the load according to the load change. ;

Panel transformer switchgear characterized in that it comprises a.
According to claim 1, wherein the high pressure and low pressure circuit breaker,

A high voltage circuit breaker connected to the high voltage power of each transformer to connect or disconnect the high voltage power;

A low voltage circuit breaker connected to the second low voltage power supply of each transformer to connect or disconnect the low voltage power supply;

Panel transformer switchgear characterized in that each formed.
The method of claim 1, wherein the transformer,

A panel transformer switchgear consisting of a single phase or a three phase and having the same load characteristics regardless of type or capacity.