CN111220826A - Integrated transformer test device for electrical test of transformer - Google Patents

Abstract

The invention provides an integrated transformer test device for a transformer electrical test, which belongs to the technical field of transformers and comprises a high-voltage test wire and a terminal box; the terminal box comprises a shell and a plurality of rows of terminals arranged on the shell; the high-voltage test wire comprises a test wire body, a clamp and a plug, wherein the clamp is arranged at one end of the test wire body, the plug is arranged at the other end of the test wire body, and the plug is matched with the terminal. After twelve special test wires are connected to the integrated wiring terminal box, a series of wiring and wire changing operations can be completed on the integrated wiring terminal box, so that the test process is greatly simplified, the risk of falling and electric shock caused by high-altitude operation when a tester frequently boards a transformer for wire changing is reduced, and the working efficiency is improved.

Description

Integrated transformer test device for electrical test of transformer

Technical Field

The invention relates to the technical field of transformers, in particular to an integrated transformer testing device for an electrical test of a transformer.

Background

The transformer is the most important electrical equipment of the transformer substation, the normal operation of the transformer is guaranteed to be important, and the electrical test is an important measure for guaranteeing the normal operation of the transformer. The total capacity of the power transformers in the power system is about 7 times the total installed capacity of the generators. In order to ensure safe operation, tests must be carried out in each link of transformer delivery, installation, debugging, maintenance and the like. The transformer test method has the advantages that a plurality of test items are tested, and the traditional test method adopts a discrete instrument to respectively test each test item, so that the efficiency is low, and the strength is high. And in addition, test wiring needs to be changed continuously according to test items during field test, and the replacement of the wiring is time-consuming and labor-consuming and is easy to make mistakes. Because the 110kV and 220kV transformer sleeves are higher, when the field test wiring is changed, a person needs to use a lifting vehicle and a ladder to finish the field test wiring, much time is usually spent on the test wiring change during the field test, and the potential safety hazard is increased because a tester frequently steps on the transformer to perform high-altitude operation.

The patent with publication number CN206399973U discloses a portable transformer test device, and it includes the base that the level set up, locate the workstation of base one side and arrange the test instrument on the workstation in, and the base opposite side is the test bench, and test bench and workstation are separated through the insulation board of laminating in workstation one side. An object of the utility model is to provide a portable transformer test device has solved the problem of carrying the difficulty among the transformer test process, has saved a large amount of manpowers, has eliminated the potential safety hazard among the insulation test process.

The patent of publication number CN207964977U discloses a transformer test device, the power distribution box comprises a box body, a plurality of branches of bottom fixedly connected with of box, the bottom fixedly connected with bearing of branch, the branch bottom is equipped with the iron stand, branch passes through the bearing and links to each other with the iron stand activity, the below of iron stand is equipped with the pivot, the gyro wheel rotates with the iron stand through the pivot and links to each other, one side rigid coupling of box has the baffle, the equal rigid coupling in both sides of baffle has the iron set, top one side of box is equipped with first case lid, the top opposite side of box is equipped with the second case lid.

The problem of convenient removal and transport has all been solved to two above-mentioned patents, has both accomplished conveniently to carry and transports, has also accomplished and has protected tool commonly used and not lost and can not lead to electronic component's damage when carrying out the experimental work of transformer, but the experiment operation is still complicated, need constantly change the wiring, and is very inconvenient.

Disclosure of Invention

In view of the above, the present invention provides an integrated transformer testing apparatus for electrical testing of a transformer.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

an integrated transformer test device for a transformer electrical test comprises a high-voltage test wire and a terminal box; the terminal box comprises a shell and a plurality of rows of terminals arranged on the shell; the high-voltage test wire comprises a test wire body, a clamp and a plug, wherein the clamp is arranged at one end of the test wire body, the plug is arranged at the other end of the test wire body, and the plug is matched with the terminal.

Further, the terminal box is rectangular.

Furthermore, the terminals are arranged in four rows, the first row of terminals are mutually independent and suspended, the second row of terminals are grounded in a short circuit mode, the third row of terminals are shielded in a short circuit mode, and the fourth row of terminals are suspended in a short circuit mode.

Further, twelve terminals are provided in each row, corresponding to the high voltage side A, B, C, O of the transformer, the medium voltage sides Am, Bm, Cm, and Om, and the low voltage sides a, b, c, and o, respectively.

Furthermore, each test wire is connected with three plugs, two adjacent plugs are connected with the core wire, and the other plug is connected with the shielding wire.

Further, the use method of the integrated transformer test device for the electrical test of the transformer,

(1) when measuring the capacitance and dielectric loss of the high-voltage side winding, short-circuiting the medium-voltage side and the low-voltage side to be grounded, and connecting the high-voltage side to an electric bridge through an electric bridge high-voltage test line to test after short-circuiting the high-voltage side;

(2) when the capacitance and dielectric loss of the medium-voltage side winding are tested, the high-voltage side is in short circuit grounding, the medium-voltage side is in grounding opening, and meanwhile, the test high-voltage wire is switched to the medium-voltage side;

(3) when the capacitance and dielectric loss of the low-voltage side winding are tested, the high-voltage side is in short circuit grounding, the low-voltage side is in grounding opening, and meanwhile, the test high-voltage line is switched to the low-voltage side.

Along with the adjustment of national energy policy, under the condition of vigorously developing hydroelectric power and nuclear power, the number of matched products is correspondingly increased, and one of the characteristics of the products is that a high-voltage outlet wire is directly connected with a GIS high-voltage switch. The reliability of a large power transformer, which is one of the most important and expensive devices in a power transmission and transformation system, is directly related to the safe and stable operation of the power system. The transformer is a device for changing AC voltage and current value by using electromagnetic induction phenomenon, is one of necessary components for electronic products, and generally tests high voltage, low voltage, temperature resistance and the like after the transformer is manufactured. The existing transformer test device selects the oil-filled sleeve, the structure weight is large, the support needs to be additionally arranged between the rising seat and the oil tank, and because the tolerance of each product is inconsistent, each product needs to be welded on the support, and the assembly workload is very large. The existing test device generally adopts a load simulation mode to test, the high-frequency overvoltage state of the transformer after the transformer is put into use cannot be tested by the load simulation, and the temperature detection is inaccurate, so that hidden dangers are brought to the use of the transformer. Therefore, a plurality of researches are carried out by those skilled in the art on reducing the weight of the device and improving the accuracy of the test, for example, a patent with publication number CN201540308U discloses a transformer test device, which belongs to the technical field of transformer manufacturing. The technical scheme is that the device comprises a sleeve, an upper lifting seat, a lower lifting seat, a voltage-sharing ball and an insulating cylinder, wherein the voltage-sharing ball and the insulating cylinder are arranged between the upper lifting seat and the lower lifting seat, a silicon rubber sleeve is arranged above the upper lifting seat, the insulating cylinder is arranged outside the voltage-sharing ball, and the upper lifting seat is of an upper closing-up structure. The patent with publication number CN203178415U discloses a transformer testing device, which comprises a box body, a temperature detecting mechanism, a core body, a primary winding and a secondary winding, wherein the box body is filled with liquid oil, the primary winding and the secondary winding are wound on the core body to form a transformer and are integrally placed in the box body, the temperature detecting mechanism is also placed in the box body, and a high-voltage lead and a low-voltage lead are respectively led out of the box body on the core body. And the difficulty caused by the fact that test wiring needs to be changed continuously according to test items during field test is rarely researched. The invention provides an integrated transformer testing device for an electrical test of a transformer, which can solve the problems that the time and labor are wasted and the potential safety hazard is increased when the transformer is frequently used for replacing wires when the electrical test of the transformer is carried out.

The invention has the beneficial effects that:

after twelve special test wires are connected to the integrated wiring terminal box, a series of wiring and wire changing operations can be completed on the integrated wiring terminal box, so that the test process is greatly simplified, the risk of falling and electric shock caused by high-altitude operation when a tester frequently boards a transformer for wire changing is reduced, and the working efficiency is improved.

Firstly, the test wires required by various tests of the transformer are integrated into a set of standard test wires, so that the condition that one set of test wires of a set of test device is multiple and disordered in the prior art is changed.

Secondly, through integrated form wiring terminal case, experimental wiring of change that can convenient and fast satisfies all experimental wiring modes. The condition that personnel need frequently climb up the transformer and change the line in the past is changed, the electric shock risk of falling that has reduced high altitude construction and brought.

During the test, only the wire changing operation is needed to be carried out on the integrated wiring terminal box, and the wire changing can be carried out through the integrated wiring terminal box in a series of tests such as a subsequent transformer insulation resistance test, a tap switch waveform test, a direct current resistance test, a transformation ratio test and the like, so that the test is completed, and testers do not need to mount the transformer before all tests are finished, so that the operation is very convenient and safe.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of the structure of a high voltage test line according to the present invention.

Fig. 2 is a schematic structural view of the terminal box of the present invention.

Fig. 3 is a plan view of the terminal box of the present invention.

FIG. 4 is a schematic diagram of the wiring of the high-voltage side winding of the transformer for capacitance and dielectric loss test.

Fig. 5 is a schematic wiring diagram of the testing apparatus using the integrated transformer according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 5 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Example 1

Referring to fig. 1 to 5, the present embodiment provides an integrated transformer testing apparatus for electrical testing of a transformer, including a high voltage testing line and a terminal box; the terminal box comprises a shell 5 and a plurality of rows of terminals 4 arranged on the shell; the high-voltage test wire comprises a test wire 2, a clamp 1 arranged at one end of the test wire 2 and a plug 3 arranged at the other end of the test wire 2, wherein the plug 3 is matched with the terminal 3.

The terminals 4 are arranged in four rows, the first row of terminals are mutually independent and suspended, the second row of terminals are in short circuit grounding, the third row of terminals are in short circuit shielding, and the fourth row of terminals are in short circuit suspension.

Twelve terminals are arranged in each row, and correspond to a high-voltage side A, B, C, O of the transformer, medium-voltage sides Am, Bm, Cm and Om, and low-voltage sides a, b, c and o respectively.

Each test wire 2 is connected with three plugs 3, two adjacent plugs are connected with the core wire, and the other plug is connected with the shielding wire.

Firstly, 12 high-voltage test wires as shown in figure 1 are arranged, the rated voltage is 10kV (according to needs), and the rated current is 10A (according to needs), so that the use requirements can be met. Respectively corresponding to the high voltage side A, B, C, O of the transformer, the medium voltage sides Am, Bm, Cm and Om, and the low voltage sides a, b, c and o. Taking a transformer winding capacitance and dielectric loss test as an example, when measuring the capacitance and dielectric loss of a high-voltage side winding, short-circuiting the medium-voltage side and the low-voltage side to be grounded, and connecting the high-voltage side to an electric bridge through an electric bridge high-voltage test line for testing after short-circuiting the high-voltage side; when the capacitance and dielectric loss of the medium-voltage side winding are tested, the high-voltage side needs to be grounded in a short circuit mode, the medium-voltage side needs to be grounded, and meanwhile the test high-voltage wire is switched to the medium-voltage side; the same applies when testing the low pressure side. The existing test method needs to change the wiring mode twice in the test, and people need to mount the transformer to change the wires, so that time and labor are wasted, and potential safety hazards are increased.

Example 2

Referring to fig. 1-5, the present embodiment provides an integrated transformer testing apparatus for electrical testing of a transformer, which is an improvement on embodiment 1: the terminal box is rectangular. The terminal box integrates 4 × 12 terminals. The first row of terminals are mutually independent and suspended, the second row of terminals are grounded in a short circuit mode, the third row of terminals are shielded in a short circuit mode, and the fourth row of terminals are suspended in a short circuit mode. The shell of the terminal box is grounded, and the voltage between the terminals and the shell can bear more than 10 kV. The material selection of the standard test line and the integrated terminal box strictly meets the regulation requirements, can resist high voltage, and guarantees the safety of ground testers. By using the integrated transformer test device, after twelve special test wires are connected to the integrated wiring terminal box, a series of wiring and wire changing operations can be completed on the integrated wiring terminal box, so that the test process is greatly simplified, the risk of falling and electric shock caused by high-altitude operation when a tester frequently climbs the transformer to change wires is reduced, and the working efficiency is improved.

Example 3

The present embodiment provides a method for using an integrated transformer test apparatus for electrical testing of a transformer,

(1) when measuring the capacitance and dielectric loss of the high-voltage side winding, short-circuiting the medium-voltage side and the low-voltage side to be grounded, and connecting the high-voltage side to an electric bridge through an electric bridge high-voltage test line to test after short-circuiting the high-voltage side;

(2) when the capacitance and dielectric loss of the medium-voltage side winding are tested, the high-voltage side is in short circuit grounding, the medium-voltage side is in grounding opening, and meanwhile, the test high-voltage wire is switched to the medium-voltage side;

(3) when the capacitance and dielectric loss of the low-voltage side winding are tested, the high-voltage side is in short circuit grounding, the low-voltage side is in grounding opening, and meanwhile, the test high-voltage line is switched to the low-voltage side.

During testing, only the wire changing operation is required to be carried out on the integrated wiring terminal box. And a series of tests such as a subsequent transformer insulation resistance test, a tap switch waveform test, a direct current resistance test, a transformation ratio test and the like can be carried out through the integrated wiring terminal box to change the wires, so that the tests are completed. It is no longer necessary for the tester to board the transformer until the entire test is completed.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. The utility model provides an integrated form transformer test device for transformer electrical test which characterized in that: the high-voltage testing device comprises a high-voltage testing wire and a terminal box; the terminal box comprises a shell and a plurality of rows of terminals arranged on the shell; the high-voltage test wire comprises a test wire body, a clamp and a plug, wherein the clamp is arranged at one end of the test wire body, the plug is arranged at the other end of the test wire body, and the plug is matched with the terminal.

2. An integrated transformer tester for electrical testing of transformers according to claim 1, wherein: the terminal box is rectangular.

3. An integrated transformer tester for electrical testing of transformers according to claim 2, wherein: the terminals are arranged in four rows, the first row of terminals are mutually independent and suspended, the second row of terminals are in short circuit grounding, the third row of terminals are in short circuit shielding, and the fourth row of terminals are in short circuit suspension.

4. An integrated transformer tester for electrical testing of transformers according to claim 3, wherein: twelve terminals are arranged in each row, and correspond to a high-voltage side A, B, C, O of the transformer, medium-voltage sides Am, Bm, Cm and Om, and low-voltage sides a, b, c and o respectively.

5. An integrated transformer tester for electrical testing of transformers according to claim 4, wherein: each test wire is connected with three plugs, two adjacent plugs are connected with the core wire, and the other plug is connected with the shielding wire.

6. Use of an integrated transformer tester for electrical testing of transformers according to any of claims 1-5, characterised in that:

(1) when measuring the capacitance and dielectric loss of the high-voltage side winding, short-circuiting the medium-voltage side and the low-voltage side to be grounded, and connecting the high-voltage side to an electric bridge through an electric bridge high-voltage test line to test after short-circuiting the high-voltage side;

(2) when the capacitance and dielectric loss of the medium-voltage side winding are tested, the high-voltage side is in short circuit grounding, the medium-voltage side is in grounding opening, and meanwhile, the test high-voltage wire is switched to the medium-voltage side;

(3) when the capacitance and dielectric loss of the low-voltage side winding are tested, the high-voltage side is in short circuit grounding, the low-voltage side is in grounding opening, and meanwhile, the test high-voltage line is switched to the low-voltage side.

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