KR101123272B1 - Temporary Transformer Device and Transformer Changing Method Using the Same - Google Patents

Abstract

The present invention is a temporary transmission device and a burnout transformer replacement method using the same.

In the burnout transformer replacement method using a temporary transmission device according to an embodiment of the present invention, the step of determining the state of the burnout transformer, the ground wire is connected to the temporary transmission device and grounded, a neutral wire in a low voltage line to the temporary power transmission device And a step of connecting a low voltage line, a step of connecting a high voltage line to the temporary power transmission device in a high voltage line, a step of performing temporary power transmission in the temporary transmission device, and replacing the burnt out transformer, wherein the high voltage cable is connected to the temporary power transmission device. The step of connecting the cable temporary hanger is fixed to the high voltage line near the burnout transformer, the step of installing a cable clamp at the bottom of the cable temporary hanger, the step of fixing the high voltage cable to the cable clamp, grip all the grip Step of mounting the clamp stick, cut out switch (COS; Cut Out) of the high-voltage line And a step of connecting the connection clamp to the switch and a step of firmly tightening the grip all clamp stick equipped with the high voltage cable connection clamp to install the high voltage cable.

Temporary Power Transmission Device

Description

Temporary transformer device and transformer changing method using the same

The present invention relates to a temporary transmission apparatus and a method of replacing a burnout transformer using the same. More specifically, the single-phase burnout of a single-phase columnar transformer and a three-phase columnar transformer is distributed by using a temporary cable hook method. The present invention relates to a temporary power transmission device providing an indirect live wire method that can be connected to a vehicle fuse holder, and a method of replacing a burnt out transformer using the same.

Distribution transformers have the highest market share among the supply materials and account for more than 30% of distribution losses. Transformer failures include primary winding interlayer short circuits due to impurity infiltration or varnish impregnated water inflow, soil area (shore, industrial complex, etc.), corrosion of transformer enclosure due to wear of the enclosure paint, leakage, bushing damage, tap lead incorrect wiring. The failure occurs due to various reasons such as parts defects, manufacturing process problems and short-circuit strength failure.

In the event of burnout (defect) of the columnar transformer, it is dispatched from the distribution operation room to the site, the transformer is inspected at the site, the burnout level is determined and the replacement is decided.

At this time, it takes a long time during the replacement of the column transformer, which causes the inconvenience and complaints of the customer.

On the other hand, the existing method for replacing the main-phase transformer is complicated because the three-phase column transformer needs to be replaced after all three phases have been blackened by using a three-phase mobile transformer car or after performing an uninterruptible live work even if there is only one burnout transformer. There was an inefficient problem such as a long time.

In order to overcome this problem, a single-phase transformer vehicle was devised, but there was a problem in safety due to the high degree of difficulty, which requires the operation of the phase of the special high-voltage distribution line connected to the primary side of the transformer in which the failure occurred.

The present invention has been made in order to solve the above problems, in the single-phase columnar transformer and three-phase columnar transformers, the temporary transmission device capable of temporary transmission by indirect live when the single-phase burnout, and can replace the burnout transformer with an uninterruptible power and burnout using the same It is to provide a transformer replacement method.

According to one aspect of the present invention, a temporary power transmission apparatus is provided.

Temporary power transmission device according to an embodiment of the present invention is a high-voltage connection member is connected to a high-voltage line from a high-voltage distribution line, a high-voltage circuit breaker is cut off the high-voltage current flowing from the high-voltage distribution line, the high-voltage current introduced through the high-voltage cable low voltage current Transformer for converting into low and low voltage switchgear for connecting the low voltage line and the neutral line connected to the low voltage line and the neutral line in the forward or reverse direction according to the connection state from the low voltage distribution line, the low pressure switch for opening and closing the low voltage line connected to the low voltage line, And a low voltage connection member connected thereto and an N line connection member connected to the neutral wire, wherein the high voltage circuit breaker and the low voltage switch are located outside the transformer, and when an overload or a fault current flows in, it is diagnosed and blocked.

According to one aspect of the invention, there is provided a burnout transformer replacement method using a temporary transmission device.

In the burnout transformer replacement method using a temporary transmission device according to an embodiment of the present invention, the step of determining the state of the burnout transformer, the ground wire is connected to the temporary transmission device and grounded, a neutral wire in a low voltage line to the temporary power transmission device And a step of connecting a low voltage line, a step of connecting a high voltage line to the temporary power transmission device in a high voltage line, a step of performing temporary power transmission in the temporary transmission device, and replacing the burnt out transformer, wherein the high voltage cable is connected to the temporary power transmission device. The step of connecting the cable temporary hanger is fixed to the high voltage line near the burnout transformer, the step of installing a cable clamp at the bottom of the cable temporary hanger, the step of fixing the high voltage cable to the cable clamp, grip all the grip Step of mounting the clamp stick, cut out switch (COS; Cut Out) of the high-voltage line And a step of connecting the connection clamp to the switch and a step of firmly tightening the grip all clamp stick equipped with the high voltage cable connection clamp to install the high voltage cable.

The present invention has the advantage that the temporary transmission device capable of temporary transmission by indirect live wire when single-phase burnout in single-phase columnar transformer and three-phase columnar transformer is secured for easy and quick construction.

In addition, the present invention has the advantage that it is possible to replace the burnout transformer uninterrupted, the convenience of maintenance, and ensure the safety of the worker.

In addition, the present invention can save resources and prevent environmental pollution by recycling the temporary transformer for the temporary transmission transformer for the construction of the emergency recovery system existing disposal.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are views for explaining a temporary power transmission apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the temporary power transmission device 100 includes a high voltage connection member 110, a high pressure circuit breaker 120, a single phase transformer 130, a reverse connection box 140, a low pressure switch 150, and a low pressure connection member 160. , An N-line connecting member 170 and a ground connecting member 180.

The high voltage connecting member 110 is a connecting member to which a high voltage cable is connected from the high voltage distribution line on the primary side.

The high voltage circuit breaker 120 is one of a double safety device (primary side high voltage circuit breaker, secondary side low voltage switchgear) of the structure when the overload and fault current is introduced into the diagnosis, and shuts off to protect the temporary power transmission device (100).

The high voltage circuit breaker 120 may be equipped with a trip coil and a motor control unit for operating the high voltage circuit breaker to block the high pressure.

The high voltage circuit breaker 120 and the low voltage circuit breaker 150 to be described below show the state of the temporary power transmission device 100 by displaying a lamp through a control box when an overload is applied.

The high voltage breaker 120 may be, for example, a MVI (Molded Vacuum Interrupter) breaker capable of viewing a real time current, an overcurrent protection operation frequency, a recent trip current value, and a phase / earth fault target.

The single phase transformer 130 converts the high voltage (for example, 13.2 kV) of the single phase into a low voltage (for example, 230V).

The single phase transformer 130 may be manufactured by modeling a columnar transformer or a ground transformer in consideration of vehicle mounting and worker contact possibility.

The reverse connection box 140 may be connected in reverse when the connection state of the secondary transformer of the pole transformer is opposite to the normal connection wire.

Referring to FIG. 2, the forward and reverse connection box 140 will be described in more detail. In the case of the forward connection lines 141 and 143 through proper connection adjustment in the forward or reverse connection voltage connection box according to the secondary transformer connection state, X1 is The low voltage line, X2 is connected to the neutral line, and in the case of reverse connections 142 and 144, X1 is the neutral line and X2 is connected to the low voltage line.

In the case of a general transformer, the protection device is configured in series in the transformer tank, and the internal circuit of the transformer is complicated, so that the failure factor is relatively high and the Hallyu fuse cannot be replaced in the field when the fuse is operated.

However, the temporary power transmission apparatus 100 according to the present invention has a circuit breaker and a switch on the outside of the transformer 130, so that the internal circuit of the transformer 130 is simple, so that there are few internal failure factors, and the first and second failures are caused by external protection devices. It can be set to cut off the fault current quickly and accurately in any operation (fault) situation as well as factor blocking, and it has the advantage of fault current monitoring and return to normal circuit. There is an advantage that parallel operation is possible with the voltage connection plate.

The low pressure switch 150 opens and closes the line connected to the secondary side (low pressure side) distribution line.

The low pressure connection member 160 is connected to a secondary low voltage cable.

The N line connecting member 170 is a connecting member of the neutral wire, and the ground connecting member 180 is a connecting member for connecting the ground wire.

Temporary power transmission device 100 of the TTS (Temporary Transformer System) is installed in the low-voltage repair vehicle when moving and replacing the burnt out column transformer.

Temporary power transmission device 100 is a MVI (Molded Vacuum Interrupter) mounted type that has a safety device as a limited use device for a short time (about 1 to 2 hours).

Temporary power transmission method using the temporary power transmission device 100 according to an embodiment of the present invention can be installed as a low-pressure repair car and a general worker instead of a high-pressure live bucket bucket truck and a live worker, and the temporary power transmission device 100 is bulk and Consider minimizing weight, excellent vibration and insulation strength, convenience of maintenance, securing worker's safety and quick and easy installation.

Temporary power transmission device 100 was the same as the main design conditions to enable parallel operation with the existing columnar transformer as shown in Table 1, and the heat sink was not installed because it is expected that there will be no problem of transformer temperature rise by temporary use.

Main design conditions of temporary transmission system division Design condition division Design condition Capacity [kVA] Capacity [kVA] 100100 No load current [%] 0.7 Primary voltage [V] 13200
No-load hand [W] 209 Secondary voltage [V] 230
Load loss [W] 1210 Primary tap voltage [V] 13800/13200/12600
% Z [%] 3.2 efficiency[%] 98.6 Temperature rise
[° C] Winding 65 Voltage variation rate [%] 1.3 Insulation oil 60

Temporary power transmission device 100 is capable of self-diagnosis and relay trip setting in the field to protect the transformer from overload and fault current and to prevent line propagation.

In addition, the temporary power transmission apparatus 100 includes a control box having an interlock function to enable parallel operation with the primary side and the secondary side automatic feeding.

In addition, the temporary power transmission apparatus 100 confirmed that there is no abnormality in parallel operation with the voltage fluctuation rate and load fluctuation less than 5% as a result of applying the temporary power transmission apparatus to the 1Φ and 3Φ loads as shown in Table 2, and the results are shown in the graphs of FIGS. Shown in 3b.

Temporary transmission system real system voltage analysis division 1Φ transformer replacement 3Φ transformer replacement
ID No.
1000-3000
1000-4000
Sampling Time [seconds]
30 (49 total)
30 (70 total)
Average voltage P3 [V]
230.4 (T phase)
228.9 (R, S, T phase)
Voltage unbalance rate [%]
0.74
2.05
Load current [A] Exclusive 9 35 Parallel 6 20 Load 2 heaters 1kW Harmonic generator
Voltage fluctuation
0.74%
2.05%
Voltage fluctuation graph
Figure 3a
See Figure 3b

3A is a diagram representing a phase voltage in a parallel operation state after replacing a single-phase transformer, and FIG. 3B is a diagram representing a phase voltage in a parallel operation state after replacing a three-phase transformer.

4 to 6 are views for explaining a transformer replacement method using a temporary power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 4, in operation S410, a preparation operation for replacing a burnout transformer using a temporary power transmission device is performed. When the low-pressure repair vehicle arrives at the location where the column transformer is damaged, it is necessary to understand the surrounding conditions, traffic volume, pedestrian safety measures, and pre-work safety meetings. In addition, the distribution center is contacted to carry out uninterrupted work. Referring to Figure 6a, prepare a facility for temporary transmission.

In step S420, the burnout transformer is identified. The burnt out transformer primary high-pressure phase is checked, the burnout transformer cutout switch is turned off and checked for burnout, and the burnout transformer capacity and wiring are checked as shown in FIG. 6B. Afterwards, safety measures such as an access prohibition sign are taken around the power transmission apparatus.

5 and 6C, in step S430, the temporary power transmission apparatus 100 connects a ground line and grounds the ground line. The ground wire is connected to the ground connection member 180. Here, the ground connection uses a ground wire clamp.

In step S440, the temporary power transmission device 100 connects the neutral wire and the low voltage wire. As shown in FIG. 6D, the neutral wire is connected to the N-wire connecting member 170, and the low voltage wire is connected to the low voltage wire connecting member 160.

In step S450, the temporary power transmission device 100 connects a high voltage cable. As shown in FIG. 6E, the high voltage connecting member 110 removes the insulation cap and connects the high voltage cable.

In step S460, the temporary power transmission device 100 installs a neutral wire and a low voltage wire. As shown in FIG. 6F, the temporary power transmission device 100 protects the charging unit and connects the neutral wire connected to the N-wire connecting member 170 to the columnar neutral wire using a neutral wire clamp. Further, the low voltage line of the burnout columnar transformer is removed to insulate the low voltage line, and the low voltage line connected to the low voltage line connecting member 160 is connected to the columnar low voltage line by using the low pressure line clamp.

In step S470, the temporary power transmission device 100 is installed with a high voltage line. Temporary power transmission device 100 is a high voltage cable is connected to the high pressure connection member 110 is installed.

The method of installing the high voltage cable will be described in more detail below with reference to FIGS. 7 and 8.

In step S480, the temporary power transmission apparatus 100 performs temporary transmission. The temporary power transmission apparatus 100 performs temporary power transmission through a control as shown in FIG. 6G. First, the temporary power transmission device 100 is pressed by the high-pressure input button of the control box is a high-voltage current of the high-voltage distribution line is input. Since the temporary power transmission device 100 is turned on the high-pressure input of the control box. When the temporary power transmission device 100 has an abnormality, the high voltage circuit breaker 120 is operated to block the input of the high voltage current. Thereafter, when the interlock release button and the low pressure input button of the control box are pressed at the same time, the temporary transmission is completed. If an abnormality occurs during the temporary transmission, the buzzer sounds simultaneously with the comparison voltage mismatch lamp, the high voltage unloaded lamp, and the overload lamp.

7 and 8 are views for explaining a method for installing a high voltage cable of the temporary power transmission apparatus according to an embodiment of the present invention.

In step S710, as shown in Figure 8a, the temporary cable hanger is fixed to the high-voltage line near the burnout columnar transformer.

In step S720, as shown in Figure 8b, a cable clamp is installed at the bottom of the temporary cable hanger.

In step S730, as shown in Figure 8c, the high-voltage cable is fixed to the cable clamp.

In step S740, as shown in Fig. 8D, the grip all clamp stick of the high-voltage cable connection clamp is mounted.

In step S750, as shown in FIG. 8E, the high-voltage cable connection clamp is connected to the cut-out switch primary side.

In step S760, as shown in Fig. 8F, the high pressure cable is installed by tightening and tightening the grip all clamp stick equipped with the high pressure cable connection clamp.

9 is a view for explaining a method of replacing a burnt column transformer according to an embodiment of the present invention.

In operation S910, a preparation operation for replacing the burnt-out columnar transformer using the temporary power transmission device is performed.

In step S920, the operation state of the temporary power transmission device is confirmed, and the temporary power transmission is confirmed.

In step S930, the damaged columnar transformer is removed. First, check that the primary cut-out switch is turned off, remove the high voltage and neutral wires in order, and then remove the burnt out main transformer.

In step S940, the normal transformer is installed. First, the insulation inside the normal transformer is checked and the wiring is checked. In this case, the tap is switched when necessary. After that, it is connected to the normal transformer in the order of neutral wire and high voltage wire.

In step S950, the cutout switch is input to the normal transformer. Check the secondary voltage of the normal transformer (if necessary, open the cut-out switch and tap-change) and connect the low voltage line.

In step S960, the low pressure switch of the temporary power transmission device is opened. The temporary power transmission device 100 opens the low pressure switch through the input of the control box.

In step S970, the high voltage circuit breaker of the temporary power transmission device is opened. Temporary power transmission device 100 is a high-voltage circuit breaker is opened through the input of the control box.

In step S980, the cable connected to the temporary power transmission device 100 is removed. In the temporary power transmission device 100, the high voltage cable is removed, and the high voltage cable clamp contacts the neutral wire to discharge residual charge. Thereafter, the temporary power transmission apparatus 100 is removed from the low voltage wire, the neutral wire and the ground wire to complete the uninterrupted replacement of the burnt out columnar transformer.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1 to 3 are views for explaining a temporary power transmission apparatus according to an embodiment of the present invention.

4 to 6 are views for explaining a transformer replacement method using a temporary power transmission apparatus according to an embodiment of the present invention.

7 and 8 are views for explaining a method for installing a high voltage cable of a temporary power transmission apparatus according to an embodiment of the present invention.

9 is a view for explaining a method for replacing burned column transformer according to an embodiment of the present invention.

Claims (7)

In the temporary power transmission device, A high voltage connection member to which the high voltage line is connected from the high voltage distribution line; A high voltage circuit breaker to block high voltage current flowing from the high voltage distribution line; A transformer for converting a high voltage current introduced through the high voltage line into a low voltage current; A forward and reverse connection for connecting the low voltage line and the neutral line connected to the low voltage distribution line from the low voltage distribution line to the low voltage distribution line according to the connection state; A low pressure switch for opening and closing a low voltage line connected from the low pressure distribution line; A low pressure connection member to which the low pressure line is connected; And Including N-wire connecting member to which the neutral wire is connected, The high voltage circuit breaker and the low voltage switch is located outside the transformer, when the overload or fault current flows, the temporary power transmission device characterized in that for diagnosing and blocking. The method of claim 1, And a control box including at least one of a comparative voltage mismatch lamp, a high voltage non-load lamp, and an overload lamp displayed according to the diagnosis state. The method of claim 1, The high voltage circuit breaker is a temporary transmission apparatus characterized in that the MVI (Molded Vacuum Interrupter) breaker for diagnosing at least one of the real-time current, the number of over-current protection operation, the latest trip current value and the phase or ground fault target. A high voltage connection member to which the high voltage line is connected from the high voltage distribution line, a high voltage circuit breaker to block the high voltage current flowing from the high voltage distribution line, a transformer for converting the high voltage current introduced through the high voltage line into a low voltage current, and a connection from the low voltage distribution line. A forward and reverse connection for connecting the low voltage line and the neutral wire connected to the low voltage distribution line forward or reverse according to a state, a low pressure switch for opening and closing the low voltage line connected to the low voltage distribution line, a low voltage connection member to which the low voltage line is connected, and the neutral wire In the burnout transformer replacement method using the temporary power transmission device comprising the N-wire connection member to be connected and the ground connection member to which the ground wire is connected, Identifying a state of the burnout transformer; A ground wire is connected to the ground connection member and grounded; Connecting a neutral wire to the N-wire connecting member; Connecting a low voltage line to the low pressure connection member; Connecting a high voltage line to the high voltage connecting member; Performing temporary transmission in the temporary transmission apparatus; And Including the step of replacing the burnout transformer, The step of connecting the high voltage cable to the high voltage connection member Fixing a temporary cable hanger to a high voltage line near the burnout transformer; Installing a cable clamp at the bottom of the temporary cable hanger; Fixing a high voltage cable to the cable clamp; Mounting a grip all clamp stick on the cable clamp; And Connecting the cable clamp to a cut out switch (COS) of the high voltage line; And And tightening the grip all clamp stick mounted on the cable clamp, wherein the high voltage cable is installed. 5. The method of claim 4, Identifying the burnout transformer is Checking a COS OFF state and a burnout of the burnout transformer; Confirming a primary high voltage phase of the burnout transformer; And The burnout transformer replacement method using a temporary transmission device comprising the step of checking the capacity and wiring of the burnout transformer. 5. The method of claim 4, The step of replacing the burnout transformer Confirming an operation state of the temporary transmission device to confirm temporary transmission; Removing the burnt out transformer; A normal transformer is installed and a neutral wire and a high voltage wire are connected to each other; Checking the voltage on the low side of the normal transformer and connecting a low voltage line; Opening the low pressure switch and the high pressure switch of the temporary power transmission device; And The burnout transformer replacement method using the temporary transmission device comprising the step of removing the cable connected to the temporary transmission device. The method of claim 6, The normal transformer is installed, the step of connecting the neutral wire and high voltage line Checking an internal insulation state of the normal transformer; And The burnout transformer replacement method using a temporary transmission device comprising the step of checking the connection state of the normal transformer.

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