KR101080680B1 - Exchange method for trasformer without interruption of electric service - Google Patents

Abstract

A transformer uninterruptible replacement method is disclosed in which a load sharing of a transformer is shared with another transformer adjacent to the transformer to be replaced, and then the transformer can be replaced. In the transformer uninterruptible replacement method according to the present invention, first, a current transformer is installed on the A transformer side pole to be replaced and the adjacent B transformer side pole. Then connect the current section with the low voltage bypass cable. Next, both ends of the low voltage bypass cable are connected in parallel to each phase to the low voltage line on each transformer side. Then, after the COS of the transformer A side lowering line is opened (OFF), the transformer A side secondary drop line is removed to replace the transformer A. After replacement, connect the secondary cut line of transformer A side with low voltage line and turn on the COS of the primary cut line. Finally, the A and B transformer side support ports and low voltage bypass cables are removed.

Description

Transformer uninterruptible replacement method {Exchange method for trasformer without interruption of electric service}

The present invention relates to a transformer replacement method, and more particularly to a transformer uninterruptible replacement method that can easily replace the transformer using a neighboring transformer.

In general, the pole-type transformer for the distribution line is mostly supplied from the high voltage (earth voltage 13,200V, phase voltage 22,900V) wire to the power user through the low voltage distribution line or the inlet line by transforming the electricity of the high voltage while the power is connected to each phase. At this time, low voltage supply method using column transformer can be divided into 1-phase 2-wire 220V supply and 3-phase 4-wire 380 / 220V supply method. To supply voltage of 1-phase 2-wire 220V, 1 single-phase transformer, 3-phase To supply a 4-wire 380 / 220V voltage, three single-phase transformers are combined to form a sideband.

Here, in the three-phase four-wire supply method of the main-phase transformer, as shown in Fig. 1, the primary primary high-voltage lead wire for each phase is connected to each of the phase A, B, and C lines of the special high voltage line (1). The grounding down wires 4 of the three transformers 3 are jointly grounded at the bushing terminal and lowered alone to be connected to the N-phase line of the low voltage line 2, and the secondary output of each transformer 3 is output. Is connected to the power line of the low voltage line (2).

When replacing the column transformer for reasons such as aging or overload, the conventional replacement method is to operate the transformer to be replaced while causing a power failure to the consumer side by a diagonal operation, and a mobile uninterruptible power to avoid the customer power failure. By using a transformer device to bypass the target transformer to replace the transformer in an uninterruptible state, recently a bypass method by a phase shifter has been developed and applied in the field.

The replacement of transformers by slanting operation deteriorates the reliability of power supply from the electricity supplier's point of view, and the consumption of manpower due to advance electrostatic agreement and power outage guidance from the electrician's point of view, and the inconvenience and material damage caused by power failure from the electrician's point of view. Occurred. In order to solve the problem of power failure, a bypass method using a mobile uninterruptible transformer device has been developed.

In this bypass method using a mobile uninterruptible transformer vehicle, each phase of the high voltage line is connected to the primary side of three transformers, and the secondary side of the transformer is connected to each phase of the low voltage line. When replacing the phase transformer, connect the high voltage bypass line to the primary side of each phase of the high voltage line, connect the low voltage bypass line to the secondary side of the low voltage line, and apply voltage to the uninterruptible transformer car to supply the three-phase main transformer. Configure an uninterruptible bypass circuit. In this way, all three phases are replaced by an uninterruptible transformer device while maintaining an uninterrupted state.

By the way, in case of using the uninterruptible transformer vehicle, all problems due to the power failure have been solved in replacing the transformer, but in order to apply the primary power of the mobile uninterruptible transformer vehicle, the sheath of the extra-high voltage wire in the live state and the extra-high voltage bypass cable There is a risk of safety due to the complicated connection and disconnection of wires, and the extra high voltage bypass cable is laid on the ground. In addition, it is necessary to add a mobile uninterruptible transformer car so that the transformer can be replaced uninterrupted, so it is cumbersome to work in narrow places such as alleys, obstructs the traffic of the vehicle, takes too much time and expense, and has expensive equipment. The economic burden of providing it was not negligible.

In recent years, the bypass method using the phase shifter transfers the load of the transformer to be replaced by the phase shifter to another phase transformer, so that one three-phase four-wire 75KVA (equivalent common) and two 30KVA (power only) When applying this method when overloading a large-capacity transformer of three-phase valves with different capacities, such as other transformers, there is a problem that the load of exceeding the overload capacity is to be taken. The use of an expensive phase shifter for this method, which is not a publicly applicable method for transformer replacement sites, can impede the efficiency of management. For the electricity supplier, overload damage of other transformers may occur during construction. The reality is that it is impossible to use the method actively.

In addition, this method is easy to apply only when the secondary grounding cut-off lines of three transformers of each phase are not cut because they are common grounds. Since it is being cut publicly, the practical application is difficult.

The present invention has been made to solve the above problems, to provide a transformer uninterruptible replacement method that can replace the transformer after sharing the load-sharing of the transformer to another transformer adjacent to the transformer to be replaced.

The present invention to solve the above problems,

In the method of replacing the transformer with an uninterrupted low voltage line,

Installing a support hole on the A transformer side pole and the adjacent B transformer side pole to be replaced;

Installing low voltage bypass cables in both support sections;

Connecting both ends of the low voltage bypass cable to the low voltage line on the side of each transformer so as to fit in each phase;

Opening the COS of the transformer A first lowering line;

Removing the transformer side secondary cut line;

Replacing the A transformer;

Connecting the replaced A transformer side secondary cut line with the low voltage line, and then injecting COS of the primary cut line;

A transformer transformer side and B transformer side support port and the low voltage bypass cable removing step; transformer uninterruptible replacement method comprising a.

At this time, the low-pressure bypass cable may be adjustable in length by placing a joint in the middle.

As described above, the transformer uninterruptible replacement method according to the present invention is provided with a jigugu, a low voltage bypass cable and a jump cable, so that the transformer can be uninterrupted and replaced at low cost without risk and simple without using a transformer car or a phase shifting device. It becomes possible.

Hereinafter, a transformer uninterruptible replacement method according to a preferred embodiment of the present invention with reference to the accompanying drawings.

2 is a schematic view showing a transformer uninterruptible replacement method according to the present invention, FIG. 3 is a view showing both ends of the low voltage bypass cable shown in FIG. 2, and FIG. 4 is a view of the transformer A and the transformer B shown in FIG. A diagram showing a connection relationship.

Referring to Figure 2, the transformer uninterruptible replacement method according to the present invention and the support jigs 300 are respectively installed on the power pole 110 on the side of the transformer A transformer 100 to be replaced with the power pole 210 of the B transformer 200 adjacent to and , And a low voltage bypass cable 310 for connecting the support pins 300.

In addition, an insulating cap or a boosted secondary lowering line may be further provided depending on whether or not the replacement transformer (A transformer) 100 is boosted.

Hereinafter, a method of replacing a transformer with an uninterruptible power using the provided components will be described.

Usually, the high voltage line to the transformer primary bushing is referred to as the primary down line, and the voltage from the transformer terminals to the voltage line is regarded as the secondary down line.

The types of transformers are divided into 10KVA, 20KVA, 30KVA, 50KVA, 75KVA, 100KVA, and the primary cut line is common, but the secondary cut line should be used differently according to the type of transformer. That is, OW60SQ is used for 10, 20, and 30KVA, OW100SQ is used for 50KVA, 150SQ is used for 75KVA, and OW100SQ * 2 is used for 100KVA.

Therefore, when the transformer A is to be boosted and replaced from 30KVA to 50KVA, the secondary lowering line should be replaced with the boosting secondary lowering line.

Or, in case of replacing with the same load without boosting, insulate the connecting terminal part of the installed second lowering wire by insulating cap.

First, the A transformer 100 to be replaced and the B transformer 200 adjacent to each other, after installing the support port 300 on the poles 110 and 210, respectively, the low pressure bypass cable 310 to be fixed between each support port 300 ).

The low pressure bypass cable 310 is a four-strand low-voltage cable is to be bundled by one shell, as shown in Figure 3, the low-voltage bypass cable 310, both ends of the four low-voltage cable is exposed, A power supply terminal 312 is formed at the end of each low voltage cable.

In addition, the low-pressure bypass cable 310 according to the present invention is formed in multiple stages can easily adjust the length used by a simple fastening method.

That is, the low pressure bypass cable 310 is formed in the middle of the joint joint 312 of the same size as shown in Figure 2 and 3, which is used for the low pressure bypass cable 310 50m ~ 200m Since it has a length, it can be conveniently used to increase or decrease the length.

Usually the poles are installed at 50m intervals, and each pole has a transformer installed or not installed.

At this time, the adjacent transformer of the transformer to be replaced may be within 50m immediately adjacent, or may be within 200m.

However, due to the provision of the power supply transformer is necessarily to be installed within 200m low voltage bypass cable 310 used in the present invention is sufficient to have a minimum of 50m to a maximum of 200m.

Of course, two low voltage bypass cables 310a for connection and a plurality of low voltage bypass cables 310b for intermediate connection may be used for a longer extension.

When the low pressure bypass cable 310 is installed in the support hole 300 as described above, the terminal 311 for power connection formed at both ends of the low pressure bypass cable 310 is connected to the low voltage line of the A transformer 100 side. The opposite power supply terminal 311 is also connected to the low voltage line on the B transformer 200 side so that the low voltage line on the A transformer 100 side and the low voltage line on the B transformer 200 side are energized by the low voltage bypass cable 310. do.

At this time, the A transformer 100 and the B transformer 200 operate by connecting A phase, B phase, and C phase in parallel. These phases can be matched using a phase detector or tester. A phase-B phase, A phase-C phase, or B phase-C phase is 380V, and like A-A, phase can be found within 0V ~ 10V.

In such a state, since the low voltage line 4 of the A transformer 100 side is connected to both the A transformer 100 and the B transformer 200, the low voltage line of the A transformer 100 side even if the A transformer 100, which is a replacement target, is removed. The furnace 4 will not be oblique.

This uninterruptible method is obtained due to the use of a general transformer, and most transformers use only 30 to 40% of the load.

In other words, since the transformer is different from the normal load and the late night load, the transformer is installed in accordance with the late night load that is used more. Therefore, during the day when the transformer replacement work is carried out, the load of the transformer is less, and even if the double load is connected to one transformer, there is no big problem for temporary use.

After the low voltage line 4 of the A transformer 100 side is in a live state, the primary COS 125 of the A transformer 100 is opened to be 'OFF', and the secondary lowering line 130 is cut off, and then the A transformer ( Replace 100).

When the A transformer 100 is not replaced with a higher capacity, an insulation cap may be put on the peeling part of the secondary lowering line 130 and reused.

When the replacement of the A transformer 100 is completed, the secondary transformer line 130 of the A transformer 100 is connected to the low pressure line 4, and then the primary side COS 125 is put into 'ON'.

Lastly, the operation is completed by removing the low voltage bypass cable 310 and the support hole 300 installed for the uninterruptible replacement.

Unexplained numerals '140' and '240' are lek, which is a combination of a low voltage line and a secondary lower line.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, 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 by the appended claims. .

1 is a view showing the configuration of a typical three-phase four-wire columnar transformer,

2 is a schematic view showing an uninterruptible replacement method according to the present invention,

3 is a view showing a low voltage bypass cable shown in FIG.

4 is a view showing a connection relationship between the transformer A and the transformer B shown in FIG.

Claims (3)

In the method of replacing the transformer 100 by making the low voltage line 4 uninterruptible, Installing the support port 300 on the A transformer 100 side pole 110 and the adjacent B transformer 200 side pole 210 to be replaced; Installing a low pressure bypass cable (310) on both support ports (300); Parallel connecting both ends of the low voltage bypass cable 310 to the low voltage line 4 on the side of each transformer 100 and 200 so as to fit each phase; Opening a COS (125) of the primary transformer (120) side of the A transformer (100); Removing the secondary transformer line (130) on the A transformer (100) side; Replacing the A transformer (100); Connecting the replaced secondary transformer (100) side secondary lowering line (130) with the low pressure line (4), and then injecting the COS (125) of the primary lowering line (120); And And removing the low pressure bypass cable 310 and the support port 300 from the A transformer 100 side and the B transformer 200 side. The low voltage bypass cable 310 is a transformer uninterruptible replacement method, characterized in that the length can be adjusted by placing a joint 312 of the same size in the middle. According to claim 1, when the A transformer 100 is replaced with a higher capacity, the secondary lowering line 130 is replaced to match the replaced transformer, the A transformer 100 is not replaced with a higher capacity In the case of transformer uninterruptible replacement method characterized in that the work by covering the peeling portion of the secondary lowering line 130 with an insulating cap. delete

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