CN217561560U

CN217561560U - Wiring device for measuring direct current resistance of transformer

Info

Publication number: CN217561560U
Application number: CN202220990282.4U
Authority: CN
Inventors: 徐磊
Original assignee: Jiangsu Huadian Yangzhou Power Generation Co ltd
Current assignee: Jiangsu Huadian Yangzhou Power Generation Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-10-11
Anticipated expiration: 2032-04-27

Abstract

The utility model discloses a termination of measurement transformer direct current resistance in the power transformer test technical field, termination include stranded annealed copper line, and stranded annealed copper line both ends are connected with first wiring nose and second wiring nose respectively, and termination sets up in pairs and the middle clamp is equipped with insulating the pad, and transformer wiring pile head is cliied and through first insulating bolted connection to first wiring nose, second wiring nose and test pin connection. The utility model discloses a termination of measurement transformer direct current resistance has advantages such as simple structure, low cost, connection convenience, contact stability, can show improvement transformer direct current resistance measurement of efficiency.

Description

Wiring device for measuring direct current resistance of transformer

Technical Field

The utility model belongs to the technical field of power transformer test technique and specifically relates to a wiring device for measure transformer direct current resistance is related to.

Background

The power transformer is a core device of a power system, and routine tests are required to detect the state of the device regularly to ensure the safety of a power grid. The measurement of the direct current resistance of the transformer winding is an essential test item for a preventive test after the transformer is handed over, overhauled and changed into a tap changer, and is also an important inspection item after a fault. The measured data is compared with the previous test data, so that the welding quality of the winding joint, the existence of short circuit among containers of the winding, the existence of good contact of all positions of the voltage tap switch, the conformity of the actual position of the tap switch and the indication position, the existence of breakage of the outgoing line, the existence of strand breakage of the winding formed by winding multiple strands of wires in parallel and the like can be checked, and the method is one of the most important test items of the transformer. The wiring of the direct-current resistance of the transformer winding is divided into a current pole and a voltage pole, insulation must be kept between the current pole and the voltage pole, and the current pole and the voltage pole are in good contact with the wiring pile head of the transformer, so that the accuracy of measured data can be guaranteed.

In the prior art, the measurement of the direct current resistance of the transformer is realized by adopting a measurement clamp carried by a direct current resistance tester of the transformer, two jaws of the clamp are insulated from each other, one is connected with a current electrode, and the other is connected with a voltage electrode. During measurement, the clamp jaws clamp the wiring pile head of the transformer, and then the test can be carried out. In order to clamp firmly, the jaw of the clamp is in a sawtooth shape, and can only clamp the wiring pile head of the transformer in a point state. Then, since the terminal post head of the transformer is placed outdoors year by year, the surface of the terminal post head contacting with air may be oxidized seriously, which may cause an increase in contact resistance, so that it is difficult to ensure good contact between each jaw and the terminal post head of the transformer by using the measuring clamp. If data are unstable and inaccurate due to the fact that good contact cannot be achieved, the contact surface between the clamp and the transformer wiring pile head needs to be adjusted continuously, and measuring time is increased exponentially. According to statistics, when the direct-current resistance of the large-scale transformer is actually measured, the time required by each measurement is about 30 minutes to 2 hours, and the measurement efficiency is seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a measure termination of transformer direct current resistance to improve measurement of efficiency.

The purpose of the utility model is realized like this: the utility model provides a measuring transformer direct current resistance's termination, termination includes the stranded annealed copper line, and stranded annealed copper line both ends are connected with first wiring nose and second wiring nose respectively, and termination sets up in pairs and the centre presss from both sides and is equipped with insulating pad, and transformer wiring pile head is cliied and through first insulating bolted connection to first wiring nose, second wiring nose and test pin connection. The utility model discloses a measuring transformer direct current resistance's termination has advantages such as simple structure, low cost, connection convenience, contact stability, can show improvement transformer direct current resistance measurement of efficiency.

As the utility model discloses a further improvement, the insulating pad passes through the second insulation bolted connection with the stranded annealed copper line of both sides, forms monolithic structure, effectively prevents to lead to insulating pad to rock the off normal and lead to both sides stranded annealed copper line short circuit because of influences such as pnematic in the measurement process.

As the utility model discloses a further improvement, first wiring nose and second wiring nose all include wiring board and a terminal block, be equipped with first connecting hole on the wiring board of first wiring nose, be equipped with the second connecting hole on the wiring board of second wiring nose, first connecting hole aperture is 12mm, thereby it has sufficient area of contact to guarantee that first wiring nose and transformer wiring pile head (the aperture is 12mm and above), guarantee measured data's stable form and accuracy, second connecting hole aperture is 6mm, so that be connected with the test wire.

As the utility model discloses a further improvement, second wiring nose passes through metal bolt with the test lead wire and is connected, and metal bolt passes wiring board, the test lead wire of second wiring nose from inside to outside in proper order and fixed through the nut, and it is convenient to connect, and the bolt head inwards, can avoid among the measurement process shank of bolt to stab and bump insulating pad, avoids insulating pad damage or even insulating inefficacy.

As the utility model discloses a further improvement, the wiring board all is close to the inboard setting of a terminal section of thick bamboo and welded fastening for whole termination structure is compacter during measurement status, guarantees to connect the reliability, and this structure can also make a terminal section of thick bamboo play the effect of centre gripping location to insulating the pad.

As a further improvement, the lower end of the insulating pad is clamped between the connecting cylinders of the first wiring noses, and the upper end of the insulating pad is clamped between the wiring boards of the second wiring noses, so that the insulating effect is ensured.

Drawings

Fig. 1 is the utility model discloses a measure termination of transformer direct current resistance's schematic diagram.

Wherein, 1 stranded annealed copper wire, 2 first wiring nose, 2A wiring board, 3 second wiring nose, 3A wiring board. 4 insulating pads, 5 first insulating bolts, 6 current pole test leads, 7 voltage pole test leads, 8 second insulating bolts, 9 metal bolts, and 10 transformer wiring pile heads.

Detailed Description

The wiring device for measuring the direct current resistance of the transformer shown in fig. 1 comprises a plurality of soft copper wires 1, wherein two ends of the plurality of soft copper wires 1 are respectively connected with a first wiring nose 2 and a second wiring nose 3. The wiring device is arranged in pairs, an insulating pad 4 is clamped in the middle of the wiring device, the first wiring nose 2 clamps the transformer wiring pile head 10 and is connected through a first insulating bolt 5, and the second wiring nose 3 is connected with a current pole testing lead 6 and a voltage pole testing lead 7 respectively. The insulating pad 4 is connected with the stranded annealed copper wires 1 on two sides through second insulating bolts 8 to form an integral structure.

Specifically, the first wire lug 2 and the second wire lug 3 each include a wiring board and a wire barrel. The connecting wire cylinder is connected with a plurality of strands of annealed copper wires 1. The wiring board 2A/3A is close to the inner side of the wiring barrel and is welded and fixed, so that the whole wiring device is more compact in structure in a measuring state, connection reliability is guaranteed, and the wiring barrel can clamp and position the insulating pad 4 due to the structure. In the present embodiment, the lower end of the insulating mat 4 is sandwiched between the terminal barrels of the first terminal lugs 2, and the upper end is sandwiched between the terminal blocks 3A of the second terminal lugs 3. A first connecting hole is formed in the wiring board 2A of the first wiring nose 2, and a second connecting hole is formed in the wiring board 3A of the second wiring nose 3. The aperture of the first connecting hole is 12mm, so that the first wiring nose 2 and the transformer wiring pile head 10 are guaranteed to have enough contact area, the stability and the accuracy of measured data are guaranteed, and the aperture of the second connecting hole is 6mm, so that the first connecting hole is connected with the current pole testing lead 6 and the voltage pole testing lead 7.

Second wiring nose 3 passes through metal bolt 9 with the test lead wire and is connected, and metal bolt 9 passes wiring board 3A, the electric current utmost point test lead wire 6 (or the voltage utmost point test lead wire 7) of second wiring nose 3 from inside to outside in proper order and fixed through the nut, connects conveniently, and the bolt head inwards, can avoid among the measurement process shank of bolt to stab and touch insulating pad 4, avoids insulating pad 4 to damage or even insulating inefficacy.

In conclusion, the wiring device for measuring the direct current resistance of the transformer has the advantages of simple structure, low cost, convenience in connection, stability in contact and the like, and can obviously improve the direct current resistance measurement efficiency of the transformer.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative labor, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. A wiring device for measuring the direct current resistance of a transformer is characterized in that: the wiring device comprises a plurality of strands of annealed copper wires, wherein two ends of each strand of annealed copper wire are respectively connected with a first wiring nose and a second wiring nose, the wiring device is arranged in pairs, an insulating pad is clamped between the wiring noses, the first wiring noses clamp the wiring pile head of the transformer and are connected through first insulating bolts, and the second wiring noses are connected with the testing lead.

2. The wiring device for measuring direct current resistance of transformer according to claim 1, characterized in that: and the insulating pad is connected with the stranded annealed copper wires on the two sides through second insulating bolts.

3. The wiring device for measuring direct current resistance of transformer according to claim 1, characterized in that: first wiring nose and second wiring nose all include wiring board and wire connection barrel, be equipped with first connecting hole on the wiring board of first wiring nose, be equipped with the second connecting hole on the wiring board of second wiring nose, first connecting hole aperture is 12mm, second connecting hole aperture is 6mm.

4. The wiring device for measuring direct current resistance of transformer according to claim 3, characterized in that: the wiring board is close to the inner side of the wiring barrel and is welded and fixed.

5. The wiring device for measuring direct current resistance of transformer according to claim 3, characterized in that: the second wiring nose is connected with the test lead through a metal bolt, and the metal bolt sequentially penetrates through the wiring board and the test lead of the second wiring nose from inside to outside and is fixed through a nut.

6. The wiring device for measuring direct current resistance of a transformer according to any one of claims 3 to 5, wherein: the lower end of the insulating pad is clamped between the wiring barrels of the first wiring noses, and the upper end of the insulating pad is clamped between the wiring boards of the second wiring noses.