JPH0837111A - Disassembling Transport Transformer Transport Equipment - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] If abnormalities such as pressure or moisture absorption are found during or after transportation inspection, dehumidification and removal of dust can be performed quickly without exposing the coil to the atmosphere. Provide a transportation device for a disassembling transportation transformer. [Structure] A moisture absorbing sample 5 of the same insulator as the insulator of the coil 1 is housed in a film pack 3, and a second opening provided in the vicinity of the first opening of the film pack 3 is sealed with a film cap 3. Since the moisture absorption sample 5 can be desorbed and the transportation tank 2 can be vacuum-dried during transportation or on-site storage, if an abnormal decrease in the enclosed pressure of the dry air 12 is observed, The moisture absorption sample 5 in the film pack 3 is taken out while blowing the dry air 2, and the moisture absorption is measured with a decomposer. When it is judged to be defective, a vacuum is drawn on the spot to remove moisture, and the dry air 12
Can be enclosed to restore the normal state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transportation device for a disassembled transportation transformer, and more particularly to a transportation device for a disassembled transportation transformer for moisture-proofing and dust-proofing a coil.

[0002]

2. Description of the Related Art In recent years, as the demand for electric power has increased, the power transmission system has become higher in voltage such as 500 kV power transmission, and the transformer for power transmission and transformation has been increasing in capacity and size. In addition, since the transmission system is lengthened, there are many cases where transformers are installed in mountainous areas where transportation conditions are more severe, and therefore, it is necessary to drastically reduce the transportation size and weight of transformers.

[0003] Conventionally, for such a three-phase transformer installed in a mountainous area, a division system is used in which the contents and the tank are divided for each phase. In this method, three single-phase transformers are connected and assembled in the field to form a three-phase transformer. On the other hand, there is also a disassembling method in which a three-phase transformer that has been assembled and tested once at the factory is subdivided and transported to the iron core legs, upper and lower yokes, coils, split tanks, etc., and then reassembled on site.

[0004]

By the way, 300 MV
In the method of dividing a large-capacity transformer of A or more into each phase, it is limited to about 50 tons due to assembly space and economical efficiency. Therefore, in order to further reduce the size and weight, it must be subdivided and transported. In the subdivided transportation, the coil, which can be called the heart of the transformer, is being mailed by itself or until it is stored in the transformer tank at the site. Insulation deterioration due to moisture absorption during assembly and quality deterioration due to inclusion of dust become problems.

Therefore, a method is used in which after disassembling at the factory, the coil is film-packed with dry air and stored in a transport tank until it is reassembled at the site. However, in this method, the coil absorbs moisture before reassembly at the site due to damage to the film pack that occurs when enclosing dry air, etc. in the transport tank, or during transport and storage, or leaks due to damage to the transport tank, resulting in insulation. May cause deterioration. In this case, normally, a substation in a mountain area does not have a drying facility for that purpose, and therefore the coil needs to be returned to the factory and repaired, which causes a serious problem in the transformer assembling process.

The present invention has been made in consideration of the above circumstances, and its purpose is to detect an abnormal condition such as moisture absorption when the filling pressure of dry air is lowered during transportation or when a site inspection is conducted after transportation. Another object of the present invention is to provide a transport device for a disassembled transport transformer that can quickly dehumidify and remove dust without exposing the coil to the atmosphere.

[0007]

In order to achieve the above object, the first aspect of the present invention is to seal a film-packed coil together with dry air and a dry air for storing the film-packed coil during transportation. A transport device for a disassembling transport transformer that transports a coil that is doubly sealed by a transport tank having a first opening that is sealed by a detachable lid, wherein an insulator of the coil is provided in the film pack. A moisture absorbing sample of the same insulator is stored, a second opening is provided in the film pack in the vicinity of the first opening of the transport tank, and the second opening is sealed with a film cap to be used for transportation or on site. It is characterized in that the moisture absorption sample can be desorbed and the transportation tank can be vacuumed and dried during storage.

[0008]

According to the present invention, the dry air charge pressure in the transport tank is monitored by a pressure gauge during transportation or on-site storage, and if an abnormal drop in the dry air charge pressure is observed, While blowing dry air, take out the moisture absorption sample in the film pack, measure the moisture absorption with a decomposer, and if it is judged to be defective, evacuate on the spot to remove moisture, then seal dry air and normal It can be returned to the normal state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A coil transportation device for a disassembly transportation transformer according to an embodiment of the present invention will be described below with reference to FIG. In FIG. 1, a low voltage coil 1a and a high voltage coil 1b of a transformer are fastened by a lower tightening plate 1c and an upper tightening plate 1d, and the coil 1 is assembled for each phase, and is used to insulate the coil 1. A film pack 3 in which a moisture absorbing sample 5 of the same insulator as the insulator has an opening through which the moisture absorbing sample 5 can be taken in and out, and the opening is sealed with a film cap 4.
After the coil 1 is sealed by, the coil 1 is housed in the lower transport tank 2a, the communication pipe 11 that connects the inside of the film pack 3 and the outside of the transport tank 2 is attached, and then the upper transport tank 2b is covered.

The transport tank 2 is made of a strong member that does not damage the contents stored therein due to deformation of the tank due to vacuuming, a manhole 6 is provided in the vicinity of the portion facing the film cap 4, and the transport tank 2 is filled with dry air. Connection valve 10a,
A vacuum pump connection valve 10b and a pressure gauge 7 for measuring the dry air filling pressure in the transport tank 2 are attached.

Since this embodiment is constructed as described above, the vacuum pump 9 is connected to the vacuum pump connecting valve 10b before the factory shipment, and the film pack 3 and the transport tank 2 are evacuated at the same pressure at the same time. , Vacuum pump connection valve 1 after stationary
0b is closed, and then the dry air generator 8 is connected to the dry air connection valve 10a, and the dry air 12 is enclosed in the film pack 3 and the transport tank 2 at the same pressure at the same time. Measure the filling pressure, adjust the filling pressure appropriately, and put it in the transportation state. The dry air generator 8 and the vacuum pump 9 are separately sent.

By the way, when an abnormal drop in the enclosed pressure of the dry air 12 indicated by the pressure gauge 7 is observed during the transportation in the above-mentioned transportation state or during the storage before the on-site assembly, the dry air separately sent. Open the manhole 6 while blowing dry air 12 from the generator 8 into the transportation tank 2,
Enter the transport tank 2, check the internal abnormality, remove the film cap 4 provided on the film pack 3, take out the moisture absorption sample 5 stored in advance, measure the moisture absorption by a separately sent analyzer, and measure the moisture absorption. If the amount exceeds the limit value, the damaged portion is repaired, reassembled, vacuumed as in the factory shipment, and the dry air 12 is sealed to restore the normal condition. Further, instead of the moisture absorption sample 5, the same effect as that of this embodiment can be obtained even if a monitor device is housed and directly measured.

[0013]

As described above, according to the transport device for the disassembling and transporting transformer of the present invention, the film-packed coil that is disassembled and transported for reducing the transport weight of the large capacity transformer is being transported or is on site. If there is a risk of absorbing moisture before assembly, you can immediately dehumidify and remove dust on the spot, so you can perform on-site assembly without the steps of taking it back to the factory, disassembling, redrying, and reshipping as in the past. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a side view showing a part of an embodiment of the present invention in section.

[Explanation of symbols]

1 ... Coil, 2 ... Transport tank, 3 ... Film pack, 4
... film cap, 5 ... hygroscopic sample, 6 ... manhole, 7 ... pressure gauge, 8 ... dry air generator, 9 ... vacuum pump, 10a, 10b ... valve, 11 ... communicating pipe, 12 ... dry air.

Claims (1)

[Claims] 1. A coil which is film-packed with dry air, and a transport tank having a first opening which seals dry air for storing the film-packed coil during transportation and is sealed by a detachable lid. In a transport device for a disassembling transport transformer that transports a double-sealed coil, a moisture absorbing sample of the same insulator as the insulator of the coil is stored in the film pack, and the first pack of the transport tank is contained in the film pack. A second opening is provided in the vicinity of the opening, and the second opening is sealed with a film cap so that the hygroscopic sample can be desorbed and vacuum-dried in the transportation tank during transportation or during on-site storage. Disassembling and transporting transformer transportation device characterized by the above-mentioned configuration.