CN103956251B - Auxiliary oil feed device of oil-immersed current transformer - Google Patents

Abstract

The invention discloses an auxiliary oil replenishing device for an oil-immersed current transformer, which comprises: a support mechanism and a lifting mechanism; the support mechanism includes two columns and two horizontal bars respectively connected to the upper ends of the columns, The opposite end of the cross bar is fixedly connected with a disk, and the central hole of the disk is an internally threaded hole; The columns are parallel, and a handle for driving the screw to rotate is provided on the top of the screw; a beam is connected to the bottom of the screw, and bolts parallel to the screw are respectively connected to two ends of the beam. This device is suitable for the stabilization of metal expanders of current transformers of various sizes. The device is light in weight, easy to operate and easy to assemble. After the application of this device, the operation of power failure and transmission is reduced, and the risk of on-site operations is reduced.

Description

Oil-immersed current transformer auxiliary oil supply device

Technical field:

The invention relates to an auxiliary oil supply device for an oil-immersed current transformer.

Background technique:

At present, the 110kV and 220kV current transformers used in the power system are divided into SF6 or oil-filled types, of which the oil-filled type accounts for the vast majority, and the maintenance and oil replenishment of oil-filled current transformers are common tasks.

The oil-immersed current transformer adopts a fully sealed structure with an expander. If an oil sample is taken, the same amount of transformer oil should be added in time. If the transformer is overhauled, it should also be strictly vacuum oiled.

After the oil filling is completed, the metal expander that reflects the oil level of the transformer is affected by the negative pressure and its own weight. When the oil filling interface is removed, the corrugated expander will shrink and the oil will be ejected. In order to avoid this situation, the corrugated expander is now stabilized by a crane, but this method often needs to accompany the busbar above the transformer or the bridge line adjacent to the interval, which greatly affects the production plan and increases Stopping the power transmission operation brings risks to on-site operations.

Invention content:

In order to overcome the defects of the prior art, the purpose of the present invention is to provide an oil-immersed current transformer auxiliary oil supply device, which is suitable for the stabilization of metal expanders of current transformers of various sizes. The device is light in weight, easy to operate, It is easy to assemble, and after the application of this device, the operation of power failure and transmission is reduced, and the risk of on-site operation is reduced.

The present invention solves technical problem and adopts following technical scheme:

Oil-immersed current transformer auxiliary oil replenishment device, which includes:

A supporting mechanism and a lifting mechanism; the supporting mechanism includes two columns and two cross bars respectively connected to the upper ends of the columns, the opposite ends of the two cross bars are fixedly connected with a disc, and the central hole of the disc is Internally threaded hole;

The lifting mechanism includes a lead screw matched with the inner threaded hole of the disc, the lead screw is parallel to the column, and a handle for driving the lead screw to rotate is provided at the top of the lead screw; The end is connected with a crossbeam, and the two ends of the crossbeam are respectively connected with bolts parallel to the lead screw.

The bottom of each column is provided with an inverted U-shaped gap.

The middle part of the column is provided with a hollow structure to reduce weight.

The distance between the two uprights is adjustable, and the specific structure is as follows: a horizontal U-shaped groove is provided on the top side of each upright, and the crossbar is embedded in the U-shaped groove. A long slot is provided in the length direction, and the locking bolt is inserted into the U-shaped slot from the top of the column and embedded in the long slot to lock the cross bar on the column.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The parts of this device are made of stainless steel, which can increase the service life of the device. The middle part of the column is equipped with a hollow structure to reduce the weight of the equipment on the basis of ensuring strength.

2. There is an inverted U-shaped gap at the bottom of the column. In this special use environment, the column can be supported on the channel steel or flat steel of the transformer base by means of the gap, which is convenient for finding a support point and making the whole device stable.

3. The distance between the two columns is adjustable, which is suitable for transformers of different sizes. The column and the crossbar adopt a detachable assembly structure, which is easy to carry to the construction site.

4. A disc and a lifting screw are used between the two horizontal bars to transmit the force on the screw to the horizontal bar and the column evenly and stably, increasing the stability of the device. The screw is rotated by a handle and can be independently operated by a single person. operate.

5. In the existing technology before using this device, the on-site investigation before work found that: the bypass bus is above the rheology, the height is about 10 meters, and the adjacent equipment is charged at intervals. Considering the safe working distance, the power must be cut off Then arrange the crane operation. Due to the power supply to the high-speed rail at adjacent intervals, maintenance tasks can only be arranged in the middle of the night. After 4 hours of substation outage operation, 3 hours of maintenance work, and 3 hours of substation recovery operation, the oil replenishment work is completed. After adopting the device of the present invention, the oil injection work is shortened to 3 hours from the original 8.4 hours. The novel device has a stable structure after being assembled and installed, and can be operated independently by a single person.

6. The use of this device has greatly saved costs. Taking 2013 as an example, Chuzhou Power Supply Company completed the oil replenishment of oil-immersed current transformers for a total of 4 times. If the previous practice of using engineering vehicles to cooperate with power outages requires at least one engineering vehicle, three operators, and a crane and command, after using this device, only one engineering vehicle and three operators are needed. 800 yuan per shift, 400 yuan per shift of engineering vehicles, and 200 yuan per day for workers, can save (800+400)*4=4800 yuan. In addition, after adopting the new device, the operation of stopping power transmission is avoided. According to the calculation of three substation operators and one engineering vehicle, (3*200+400)*4=4000 can be saved. Taking the 110kV Sanchu 512 of Sancha Road substation as an example, its average current is about 220A, calculated according to the electricity fee of 0.5/kwh, the power loss saved by the application of the new device is: [(8.4-3)*110*1000*220* 1.732*3600*0.5/3.6*1000000]*4=113168.88. Total savings: 4800+4000+113168.88＝121968.88 yuan.

Description of drawings:

Fig. 1 is the front view of this device; Fig. 2 is the left view of this device (only shows column, cross bar, locking bolt and disk among the figure); Fig. 3 is the side view of column; Fig. 4 is the top view of this device (Fig. Only the column, the cross bar, the locking bolt and the disk are shown in the figure); Fig. 5 is a schematic diagram of the use state of the device.

Numbers in the figure: 1 is a column, 2 is a cross bar, 3 is a disc, 4 is a screw, 5 is a handle, 6 is a beam, 7 is a bolt, 8 is an inverted U-shaped gap, 9 is a U-shaped groove, and 10 is a Long slot, 11 is a locking bolt, 12 is an expander, and 13 is a vacuum oiling device joint.

The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

detailed description:

Embodiment: In combination with Figures 1-4, the oil-immersed current transformer auxiliary oil replenishment device of this embodiment includes:

Support mechanism and lifting mechanism; wherein, the support mechanism includes two columns 1 and two crossbars 2 respectively connected to the upper ends of the column 1, the opposite ends of the two crossbars are fixedly connected with a disc 3, and the central hole of the disc is Internally threaded hole.

In the specific setting, the distance between the two columns can be adjusted, so as to be suitable for oiling the current transformers of different specifications and sizes. Embedded in the U-shaped groove, the thickness of the crossbar 2 is basically equal to the height of the U-shaped groove 9, and a long groove 10 is provided on the top surface of the crossbar along its length direction, and the locking bolt 11 is inserted into the U-shaped groove from the top of the column Among them, the front end of the locking bolt 11 can be locked on the column until the front end of the locking bolt 11 is embedded in the long groove 10, and the distance between the two columns can be adjusted by loosening the locking bolt.

The lifting mechanism includes a lead screw 4 cooperating with the internal thread hole of the disc 3, the lead screw is parallel to the column, and a handle 5 for driving the lead screw to rotate is provided at the top of the lead screw; a crossbeam 6 is connected at the bottom of the lead screw, and the crossbeam The two ends of each are respectively connected with bolts 7 parallel to the leading screw. In the specific setting, the middle part of the beam 6 is provided with a light hole for the lead screw to pass through, and the two ends of the beam are also provided with light holes for connecting two bolts 7.

In such a special environment, in order to facilitate the support of the column 1, an inverted U-shaped notch 8 is provided at the bottom of each column, and the column can be supported by the channel steel or flat steel on the side of the transformer base by means of the notch. up and make the support firm.

In the specific setting, all parts of the device are made of stainless steel to ensure rigidity and prolong the service life, and a hollow structure is set in the middle of the column to reduce weight on the basis of ensuring strength.

See Figure 5, in use, follow the steps below:

1. Remove the oil filling hole cover on the current transformer expander 12, and connect the vacuum oil filling device connector 13 to the oil filling hole.

2. Start oil injection, and wait for the expander to extend to the predetermined position.

3. Assemble the device according to the actual size of the current transformer, adjust the distance between the two columns 1, tighten the locking bolt 11, and use the inverted U-shaped gap at the bottom of the column to firmly support the column on the transformer base.

4. Screw the two bolts 7 into the internal thread on the top of the expander 12.

5. Take off the vacuum oil filling device, and install the oil filling hole cover on the expander.

6. Slowly turn the handle 5 at the top of the screw to make the screw go down until the expander retracts to the state of no force.

7. Take off the device and finish the work.

The oil-immersed current transformer auxiliary oil supply device of the present invention reduces the risk of on-site operation and avoids the risks of insufficient distance from live equipment caused by the use of a crane. Since the rheology and switches of many 110kV and above intervals are located on both sides of the road, and the two are connected by pipe nuts, the pipe nuts need to be removed in the accompanying parking interval to make the crane work smoothly. environmental requirements. In addition, it reduces the risk of power outage, saves working time, ensures the safety of social power consumption, and creates considerable intangible benefits for enterprises and society.

Claims (3)

1. Oil-immersed current transformer auxiliary oil supply device, characterized in that it includes: Support mechanism and lifting mechanism; the support mechanism includes two columns (1) and two crossbars (2) respectively connected to the upper ends of the columns, and the opposite ends of the two crossbars are fixedly connected with a disk (3) , the central hole of the disc is an internally threaded hole; Described elevating mechanism comprises the lead screw (4) that cooperates with the internal thread hole of described disc, and described lead screw is parallel with described column, is provided with the handle (5) that drives lead screw to rotate at the top of lead screw; A crossbeam (6) is connected to the bottom end of the lead screw, and bolts (7) parallel to the lead screw are respectively connected to both ends of the crossbeam; The distance between the two columns is adjustable, and the specific structure is: a horizontal U-shaped groove (9) is provided on the top side of each column, and the crossbar is embedded in the U-shaped groove. The top surface is provided with a long groove (10) along the length direction, and the locking bolt (11) is inserted into the U-shaped groove from the top of the column and embedded in the long groove to lock the crossbar on the column. 2. The oil-immersed current transformer auxiliary oil replenishment device according to claim 1, characterized in that, an inverted U-shaped notch (8) is provided at the bottom of each column. 3. The oil-immersed current transformer auxiliary oil supply device according to claim 1, characterized in that, the middle part of the column is provided with a hollow structure to reduce weight.