KR0137303B1 - Multi-voltage type transformer - Google Patents

Abstract

The present invention relates to a multi-voltage transformer device for uninterruptible construction, which is used when replacing a distribution transformer installed around a power supply with an uninterruptible power supply.

Since there are 7 different transformer equipments currently in operation, it is necessary to prepare 7 mobile transformer devices in order to replace all the facilities of the power supply company with uninterruptible power. It is applicable only to, and not applicable to the seven types of power distribution, this time there was an economic overload because it is necessary to provide a transformer device suitable for the seven types.

The present invention has been invented to solve the above problems, and the gist of the present invention is to enable the parallel operation with the seven types of transformer equipment used by the power supply company as a single mobile transformer device. In order to draw out, the primary side (22900V) of the transformer is Y-connected and the secondary side (220V) is OPEN Y-type attached with 7 secondary bushings. Unlike one, the necessary wiring is made from the outside of the transformer, and on the low voltage side (220V), if the assembly plate according to the wiring method required for the fully automatic type A inspection device and terminal board is obtained to obtain the required voltage using an electronic switchgear, It is a type B inspection device that obtains wiring and voltage.

Description

Multi-voltage transformer device for uninterrupted construction

1 is a schematic diagram of the connection of the transformer device and the existing transformer of the present invention

2 is a layout diagram of the secondary output terminal of the multi-voltage transformer of the present invention

b is the secondary bushing connection diagram by voltage

3 is a conventional secondary secondary bushing layout

4 is a layout diagram of a secondary voltage transformer secondary bushing according to the present invention.

5 is a circuit diagram of an electronic connector of the present invention.

b is a view showing the operation of the electronic connector of the present invention

6 to 12 are terminal connection display diagrams of FIG.

13 is a diagram showing the type B examination apparatus of the present invention.

14 is a functional explanatory diagram of the examination apparatus of the present invention

15 is a circuit diagram of the examination apparatus of the present invention.

16 is a diagram showing a type A imaging device of the present invention.

FIG. 17 is an enlarged view of portion A of FIG. 16

* Explanation of symbols for main parts of the drawings

①: Indicator ②: Voltage relay

③: Output display of transformer A ④: Ammeter

⑤: Output display of B transformer⑥, ⑦: Push button

⑧: Buzzer stop button ⑨: Test button

⑩: Buzzer

1: switchgear 2: ON indicator

3: OFF indicator 4, 5, 6, 7: Relay

8: buzzer 9: pushbutton

10: test switch 11, 13, 15: safety indicator

12, 14, 16 Error indicator 17. Overload protection relay

The present invention relates to a multi-voltage transformer device for uninterruptible construction, which is used to replace a transformer installed in the surroundings with an uninterruptible power.

Conventionally, when replacing transformer of distribution line, it is inconvenient that electricity supply is stopped for a long time by stopping electricity supply at work place and working to improve the advantage. The electricity supply interruption caused by this problem has been eliminated, but the principle of this device is to operate in parallel with the transformer of the power supply company that wants to replace the mobile uninterruptible transformer device. It is terminated in parallel operation and a new transformer is replaced. When the replacement is completed, the troop operation with the mobile transformer is performed again and then the mobile transformer is removed. The electric receiver is supplied with electricity without a momentary power failure. Parallel operation of transformer Be the first, the polarities of the two transformers must be the same, and second, variable pressure, and the ratio should be the same, and the third is that the rotation direction and the phase shift on the case 3 must be the same.

In order to satisfy these conditions, the transformer equipment installed in the cable line and the mobile transformer equipment need to be the same.

However, there are seven types of transformer installations installed on electric poles by electric power companies, using one to three transformers as shown below.

As such, there are 7 types of transformer equipments of power supply companies. Therefore, 7 types of mobile transformer devices should be prepared to replace all the facilities of the power supply company with uninterrupted power. However, the electric company in charge provides several expensive mobile transformer devices. It is very difficult to be described below, and the mobile transformer device developed to date can be applied only to one type of power distribution operation, and two or more applications are impossible.

The present invention has been invented to solve the above problems, the main subject of the present invention is a single mobile transformer device, which enables parallel operation with seven types of transformer devices being used by a power supply company. In the case of uninterruptible replacement is possible.

This will be described in detail based on the drawings.

1 is a schematic diagram of the device of the present invention, one side of the power supply company (KEPCO) wiring 22.9KV high-voltage cable is connected to the existing transformer and the low-voltage busbar connected to the consumer line, the other side is connected to the mobile transformer and the parallel operation inspection device The wire connected to the low voltage bus is connected to the consumer ship line, Figure 2 is a multi-voltage transformer secondary output terminal arrangement of the present invention, the terminal U ₁ U ₂ V ₁ V ₂ Consists of W ₁ W ₀ W ₂ and earth terminal E. FIG. 2 b is a secondary bushing connection diagram for each voltage. At 4W, if the voltage is 380 / 220V, the connection is U ₂ -V ₂ -W ₂ -E and its output is U ₁ V ₁ W ₁ E and supply type 3 For 3W, if the voltage is 220V, the connection is U ₂ -V ₁ , V ₂ -W ₁ and U ₁ -W ₂ , and its output is U ₁ V ₁ W ₁ , supply method 3 At 4W the voltage is 220 / 110V, in which case the wiring is U ₂ -V ₁ and V ₂ -W ₁ and U ₁ -W ₂ and W ₀ -E and the output is U ₁ V ₁ W ₁ E.

Supply method 3 At 4W the voltage is 220 / 110V and its wiring is V ₂ -W ₁ and W ₀ -E and its output is V ₁ W ₁ W ₂ E. Supply method 3 3W voltage is 220V, connection is U ₂ -W ₁ , output is V ₁ W ₁ W ₂ , wiring method 1 2W voltage is 220V, connection is W ₂ -E, output is W ₁ W ₂ and supply method 1 At 3W, the voltage is 220 / 110V, the wiring is W ₀ -E, and the output is W ₁ W ₀ W ₂ .

FIG. 3 is a diagram of conventional secondary transformer bushing arrangement in which three output terminals are connected to three input terminals H ₁ H ₂ H ₃ , and FIG. 4 is a multi-voltage transformer secondary bushing of the present invention. As a layout diagram, three input terminals H ₁ H ₂ H ₃ are connected to seven output terminals U ₁ U ₂ V ₁ V ₂ W ₁ W ₀ W ₂ , and FIG. 5 is a circuit diagram of an electronic connector of the present invention. Seven output terminals U ₁ U ₂ V ₁ V ₂ W ₁ W ₀ W ₂ Earth (E) are connected to the input terminals H ₁ H ₂ H ₃ , and FIG. Feeding scheme 3 as indicated in 6 to 12 At 4W, the voltage is 380 / 220V and the contactor is operated at 1, 2, 3, 4 At 3W, the voltage is 220V, the contactor is operated at the sign 5,6,7,4, 3 When the voltage is 220 / 110V at 4W, the contactor is operated at 5,6,7,8,4, and supply type 3 At 4W and voltage 220 / 110V, the contactor operates at symbols 6, 8, 9, and supply type 3 When the voltage is 220V and the contactor is 3W, the contactor operates at 6,9 The contactor operates at the sign 3,10 when the voltage is 2W and 220V. The contactor works at code 8,10 when the voltage is 220 / 110W at 3W.

13 and 16 are diagrams showing the inspection apparatus of B and A tapes of the present invention. First, FIG. 13 is a type B, which is a parallel operation condition between a mobile transformer (A transformer) and a transformer in a wire (B transformer). The symbol ① indicates the normal status indicator (blue) when the connection of A and B transformers is normal and the red lamp lights when the phases of the two transformers are out of phase or there is a voltage difference.

The symbol ② is a digital volt meter relay, and the phase between the A and B transformers is out of phase or there is a voltage difference. The difference in voltage is displayed as digital, and the indicator on the wrong phase lights up.

If it is normal, no voltage difference is displayed and the indicator does not light up.

The sign ③ indicates the output voltage value of the A transformer, the sign ④ is the ammeter for measuring the load current, and the sign ⑤ the output voltage value of the B transformer so that the voltage and the presence of each phase can be known.

Symbol ⑥ is push button for magnet switch input during parallel operation and symbol ⑦ is push button for blocking magnet switch.

The symbol ⑧ indicates the alarm buzzer when the phases of A and B transformers are different or there is a voltage difference. When the buzzer rings, this button stops the operation of the buzzer.

Symbol ⑨ is a test button to check if the function is normal with various indicators of the analyzer. Symbol ⑩ is an alarm buzzer that operates when the phase or voltage between A and B transformers does not match.

FIG. 16 shows an A type of inspection apparatus in the case where the wiring system is changed into a fully automatic type by using an electromagnetic switch.

14 is an explanatory diagram of the inspection apparatus, (A) is a voltmeter indicating the transformer output voltage of the mobile transformer device, (B) is an ammeter indicating the load current of the transformer device, (C) is a mobile transformer and the existing transformer This is a test voltage detector that detects the voltage difference between the power supply companies.

In order to replace the transformer of an uninterruptible power supply, the mobile transformer unit and the existing transformer unit must be operated in parallel. In this case, the characteristics of the two transformer units must be identical as described above.

(C) hides whether or not parallel operation condition between two transformers is established. If the output of the mobile transformer is called R ₁ S ₂ T ₁ and the output of the existing transformer (replacement transformer) is called R ₂ S ₂ T ₂ , for parallel operation, the power supply side and the load side of the parallel operation switch (E) ₁ and R ₂ , S ₁ and S ₂ , and T ₁ and T ₂ must be connected respectively.

If the characteristics of the two transformer installations are combined,

There should be no voltage difference between R ₁ and R ₂ , S ₁ and S ₂ , and T ₁ and T ₂ . If there is a voltage difference, first, the phases are connected incorrectly (for example, where S or T are connected where R is connected), or the phases are connected correctly, but there is a difference in the output voltages of the mobile and existing transformers.

In other words, there is a voltage difference of 220V on one side and 200V on the other. If the voltage detector (C) detects that the phase connection between the two transformers is incorrect, (C) indicates 220V or 380V for the transformer with primary voltage 22900V and secondary voltage 220V. Is turned on, the alarm buzzer is activated, and the parallel operation switch (M / C) is interlocked to prevent input.

If the phase connection between the two transformers is normal, but there is a voltage difference between the two transformers, a circulating current flows between the two transformers as follows, and even if the transformer is severe, the transformer may be burned out.

Since the two transformers are different from each other and there may be a slight voltage difference in the manufacturing process, they should be operated in parallel as long as there is no excessive purifying current, so the voltage difference of about 1-2% does not work. It is manufactured to set it up.

For example, if the voltage value is set to 10V, it will not operate to within 10V, but if it exceeds 10V, the red indicator alarm buzzer switch (M / C) will become an interlock.

If a transformer with a voltage difference between two transformers is operated in parallel, a circulating current flows between two external transformers as follows.

D is a voltmeter indicating the output voltage of the existing transformer (installed by the power supply company).

Next, Fig. 15 is a circuit diagram of the inspection apparatus. The first (1) on the left is the input (ON) and open (OFF) circuits of the parallel operation switch (M / C) .If the two transformers are normally connected, press ON to open the switch (M / C). ) Turns ON and parallel operation. If you press OFF at this time, the switch is turned OFF.

Reference numeral 2 is an indicator that lights up when the switch M / C is turned on in (1), and reference numeral 3 is an indicator indicating that the switch M / C is OFF.

Reference signs (4) (5) and (6) are display relays indicating that there is an abnormality when the phases do not match or there is a voltage difference.

The protection (7) is a relay (RELAY) that operates when there is an error in code 4-6, and when R ₄ operates, it opens the contact R _{4 in the} circuit of code (1) (OPEN) so that M / C cannot be inputted. .

The sign (8) is an alarm buzzer that sounds when an abnormality is found in signs (4)-(6), and the sign (9) is a switch for stopping the alarm buzzer. When this is pressed, the R ₅ contact of the sign (8) is Open and the buzzer stops working.

The sign 10 is a device for testing the normal operation of the indicator. When the switch is pressed, the indicators of the indicators 12, 14 and 16 are turned on to indicate that the status of the indicator is normal.

Numerals 11, 13 and 15 are indicators that indicate a normal state when the phase connection or voltage between the two transformers is matched.

Therefore, when the abnormal indicators of the signs 12, 14 and 16 light up, the normal indicators connected together are turned off. The reference sign 17 operates when the output current of the mobile transformer is overloaded, that is, when the current value of the setting is exceeded, and the relay RE ₇ operates and the R ₇ sign 1 OPEN Parallel operation M / C is OFF to prevent accident spread.

The present invention as described above has the following advantages.

(1) A single device can be used to replace the transformer uninterrupted in all distribution methods of the power supply company,

(2) If the parallel operation switch is put in a state where the characteristics of the mobile transformer device and the existing transformer device are not matched, the closed circuit will be short-circuited and the two transformers will be burned, causing a power failure of the power supply distribution line. However, this device is a triple safety device to prevent malfunction.

(3) In the safety device, when the parallel operation condition is matched, the blue indicator lights up. When the parallel operation condition between the two transformers is not matched, it is indicated by the indicator and red light on the instrument, and the alarm buzzer is activated. As above, if the parallel operation condition is not satisfied, the interlock switch is interlocked so as not to be turned on. And in case of overload or failure, the operation is blocked to prevent accident propagation.

(4) In terms of operational convenience, in order to match the output voltage with one mobile transformer device so as to match seven power supply distribution methods with one transformer device, wiring must be done as shown in Fig. 2. Due to the considerable amount of expertise required, it was unreasonable for field workers to operate without error in any case. In order to solve this problem, the output voltage terminal board of the mobile transformer device can be easily changed by a beginner without error.

The change of voltage terminal board was made in two ways. Type A has automatic type that can be pushed by pushing PUSH BUTTON using electronic switch and type B which made 7 terminal boards according to voltage type. And when it doesn't fit, the terminal block can't be inserted.

(5) In the measuring device, in view of being easy to read and being a mobile device, the analog method adopted a strong digital method to compensate for the weakness of the analog method.

(6) Due to the economic efficiency, the conventional method is to fix the transformer device to the crane truck (2.5TON), it is impossible to use the crane truck when there is no transformer replacement work, and thus the investment cost of the equipment is heavy, and the present invention uses the transformer device. By storing it in a mobile container and loading it into a crane truck only during work, the crane truck can be used freely when there is no work, maximizing the utilization of equipment, thereby reducing the burden of facility investment.

Claims (3)

In order to draw various voltages from one transformer, the primary side (22900V) of the transformer is connected to Y, and the secondary side (220V) is connected to the secondary side by attaching seven secondary bushings in the OPEN Y method. Multi-voltage transformer device for uninterruptible construction, which enables the necessary wiring outside the transformer, unlike the Y or △ connection inside the transformer. The multi-voltage transformer device for uninterruptible construction according to claim 1, wherein the low voltage side (220V) is provided with a fully automatic type A inspection device so as to obtain a necessary voltage using an electronic switch as shown in FIG. The multi-voltage transformer device for uninterruptible construction according to claim 2, wherein the B-type inspection device obtains different wiring and voltages by covering the assembling board according to the wiring method required for the terminal board.