CN203881814U - Adaptive voltage equalizing apparatus - Google Patents

Abstract

The embodiment of the utility model provides an adaptive voltage equalizing device, which is used to shield the local strong electric field at the tip of the high potential end of the test equipment, including: a pressure equalizing mechanism with adjustable size, which is arranged at the high potential end of the high voltage bushing of the test equipment, And shield the local strong electric field at the tip of the high potential end; the compressed air drive device is connected to the test equipment, and communicates with the pressure equalizing mechanism through the air flow channel in the high voltage bushing, so as to adjust the size of the pressure equalizing mechanism through inflation and deflation; The parameter measurement unit is used to measure the high-potential end of the high-voltage bushing of the test equipment and the electric parameter of the pressure equalizing mechanism, so as to drive the compressed air drive device according to the electric quantity to adjust the size of the equalizing mechanism until the electric parameter measuring unit The measured power parameters are within the expected range.

Description

An adaptive pressure equalization device

technical field

The utility model belongs to the field of electric power detection, in particular to an adaptive voltage equalizing device. the

Background technique

When calibrating power voltage transformers with voltage levels of 1000KV and 500KV, the full voltage ratio method is generally used to trace the source with national standards. In practice, it is necessary to use power frequency series resonance or other boosting methods to increase the tested voltage transformer and standard voltage transformer to the highest rated power frequency voltage according to the expanded voltage multiple, so as to measure the secondary terminal voltage to achieve error verification. Purpose. Considering the external insulation of test equipment such as standard transformers and boosters, it is necessary to use a voltage equalizing device to shield the high-voltage end, and optimize the shielding design to effectively reduce the length and volume of the high-voltage bushing of the test equipment. The existing 1000KV and 500KV AC power voltage transformer error tests generally have fixed voltage equalizing rings and pressure equalizing caps, which have problems such as large volume, heavy weight, and the need for on-site installation. the

However, due to the limited internal size of the vehicle and the limitation of the height of the vehicle, the fixed voltage equalizing device used in the error test of the 1000KV and 500KV AC power voltage transformers cannot be integrated into the vehicle, and can only be disassembled and transported to the installation site. Proceed to assembly and installation. the

Therefore, the fixed voltage equalizing device used in the error test of the AC power voltage transformer in the prior art often cannot be integrated into the vehicle, and can only be assembled and installed temporarily at the installation site in a time-consuming and laborious manner. the

Contents of the invention

In view of this, the purpose of this utility model is to provide an adaptive pressure equalizing device, which can adaptively adjust the size of the pressure equalizing device, which can be small in size, convenient for transportation, and does not require temporary assembly. the

In order to achieve the above purpose, the embodiment of the utility model provides an adaptive voltage equalizing device, which is used to shield the local strong electric field at the tip of the high potential end of the test equipment, including:

The size-adjustable pressure equalizing mechanism is set at the high potential end of the high voltage bushing of the test equipment, and shields the local strong electric field at the tip of the high potential end;

The compressed air driving device is connected with the test equipment, and communicates with the pressure equalizing mechanism through the air flow channel in the high pressure casing, so as to adjust the external size of the pressure equalizing mechanism by adjusting its internal air pressure to achieve uniformity. The electric field strength of the air outside the high voltage bushing of the test equipment;

The power parameter measurement unit is used to measure the high potential end of the high-voltage bushing of the test equipment and the power parameters of the pressure equalizing mechanism, so as to drive the compressed air driving device to adjust the pressure equalizing mechanism according to the power parameters. size until the power parameter measured by the power parameter measuring unit is within the expected range. the

In a preferred embodiment, the device further includes a controller, connected to the compressed air drive device and the power parameter measurement unit, for receiving the power parameter measured by the power parameter measurement unit, and according to the power parameter The parameter drives the compressed air driving device to adjust the size of the pressure equalizing mechanism until the electric quantity parameter measured by the electric quantity parameter measuring unit is within an expected range. the

In a preferred embodiment, the pressure equalizing mechanism includes a top equalizing ring and a bottom equalizing ring, wherein the bottom equalizing ring is close to the high potential end of the high voltage bushing of the test equipment. the

In a preferred embodiment, both the top equalizing ring and the bottom equalizing ring are made of polymer material mixed with semiconductor material, and the semiconductor material and surface metal material doped on the surface can be at Equivalent high potential. the

In a preferred embodiment, when the test equipment participates in the power transformer error test of 500KV level and below, the controller drives the compressed air driving device to inflate the bottom equalizing ring; when the When the above-mentioned test equipment participates in the error test of power transformers of 1000KV level and above, the controller drives the compressed air drive device to adjust the bottom equalizing ring and the The internal air pressure of the top equalizing ring. the

In a preferred embodiment, the air flow channel connected to the compressed air driving device in the high pressure bushing includes a first air flow channel communicated with the bottom pressure equalizing ring and a first air flow channel communicated with the top pressure equalizing ring. Second airflow channel. the

In a preferred embodiment, the power parameter measurement unit includes: a partial discharge current sensor, a field strength detection device and a voltage sensor;

Wherein, the partial discharge current sensor is arranged on the voltage equalizing mechanism, and is used to measure the current differential value of the voltage equalizing mechanism, thereby indirectly measuring the discharge capacity of the voltage equalizing mechanism;

The field strength detection device is arranged on the pressure equalizing mechanism, and is used to measure the electric field strength at a predetermined distance outside the pressure equalizing mechanism;

The voltage sensor is connected with the test equipment and is used to measure the ground potential value of the main voltage terminal of the test equipment. the

In a preferred embodiment, the controller includes an operation controller and a logic controller, and the operation controller and the logic controller calculate the discharge capacity of the voltage equalizing mechanism and the voltage equalization value measured by the power parameter measurement unit. The electric field intensity outside the mechanism and the voltage value of the main pressure terminal of the test equipment are weighted and calculated to simulate the state parameters of the pressure equalizing mechanism, and drive the compressed air drive device to adjust the pressure equalizing mechanism according to the state parameters. size. the

In a preferred embodiment, the pressure equalizing mechanism is connected to the high potential end of the high voltage bushing of the test equipment through a flange plate and a connecting rod. the

It can be seen that the self-adaptive voltage equalizing device provided by the embodiment of the utility model measures the relevant power parameters through the power parameter measurement unit, and the controller adaptively adjusts the size of the pressure equalizing mechanism according to these power parameters, so that the pressure equalizing mechanism meets the test requirements. The pressure equalization requirements of the high potential end of the equipment make the initial volume of the entire self-adaptive pressure equalization device unnecessary to be large, which is convenient for transportation. Temporary assembly of the equalizing mechanism is required. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description These are some embodiments of the present utility model. Those skilled in the art can also obtain other drawings based on these drawings without any creative work. the

Fig. 1 is a schematic diagram of an angle of the self-adaptive pressure equalizing device provided by the utility model;

Fig. 2 is a schematic diagram of another angle of the adaptive pressure equalization device. the

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. the

An embodiment of the present invention provides an adaptive voltage equalization device, which is used for shielding the local strong electric field at the tip of the high potential end of the test equipment. The test equipment is the test equipment used in the error test of the AC power voltage transformer, and includes, for example, a standard transformer, a voltage booster, and the like. the

FIG. 1 is a schematic view of an adaptive pressure equalization device provided by the present invention, and FIG. 2 is a schematic view of another angle of the adaptive pressure equalization device. Please refer to Fig. 1 and Fig. 2 at the same time, the self-adaptive pressure equalizing device includes a pressure equalizing mechanism 6, a compressed air driving device 1 and a power parameter measuring unit. the

The size of the pressure equalizing mechanism 6 can be adjusted, and it is arranged on the high potential end 10 of the high voltage bushing 14 of the test equipment 3 . The voltage equalizing mechanism 6 is used to shield the local strong electric field at the tip of the high potential end 10 . In practice, the pressure equalizing mechanism 6 may include a top pressure equalizing ring 7 and a bottom pressure equalizing ring 4 . Wherein the bottom equalizing ring 4 is close to the high potential end 10 of the high voltage bushing 14 of the test equipment 3 . In order to realize the adjustable size of the pressure equalizing mechanism 6, both the top pressure equalizing ring 7 and the bottom pressure equalizing ring 4 may be made of polymer material blended with semiconductor material, and the surfaces are coated with metal materials. This can not only ensure the shielding characteristics of the top pressure equalizing ring 7 and the bottom pressure equalizing ring 4, but also ensure that the two can shrink and expand, so as to realize the adjustment of the diameter. the

The compressed air driving device 1 is connected with the test equipment 3, communicates with the pressure equalizing mechanism 6 through the air flow channel (not shown in the figure) in the high pressure bushing 14, so as to adjust the size of the pressure equalizing mechanism 6 through inflation and deflation. When the pressure equalizing mechanism 6 includes the top equalizing ring 7 and the bottom equalizing ring 4, the compressed air driving device can control the inflation and deflation states of the bottom equalizing ring 4 and the top equalizing ring 7 respectively, so that, according to the actual test conditions, It is necessary to flexibly adjust the inflation and deflation scheme. For example, when the test equipment 3 participates in the error test of power transformers of 500KV level and below, the compressed air driving device 1 can be driven to only inflate the bottom pressure equalizing ring 4, so that the bottom pressure equalizing ring 4 is in an inflated state, while the top equalizing ring 4 is inflated. The pressure ring 7 is in a non-inflated state, so that almost only the bottom pressure equalizing ring 4 can be used to play a role; when the test equipment 3 participates in the error test of power transformers of 1000KV level and above, it can drive the compressed air drive device 1 to the bottom The pressure equalizing ring 4 and the top equalizing ring 7 are inflated, so that both the top equalizing ring 7 and the bottom equalizing ring 4 are inflated, so that both the bottom equalizing ring 4 and the top equalizing ring 7 can function. The above-mentioned driving of the compressed air driving device 1 can be accomplished in various ways. Such as driving it manually. the

In practice, the air flow channel connected to the compressed air driving device 1 in the high pressure bushing 14 may include a first air flow channel communicated with the bottom pressure equalizing ring 4 and a second air flow channel communicated with the top pressure equalizing ring 7, the compression The air driving device 1 controls the inflation and deflation state of the bottom pressure equalizing ring 4 through the first air flow passage, and the compressed air driving device 1 controls the inflation and deflation state of the top pressure equalizing ring 7 through the second air flow passage. the

The pressure equalizing mechanism 6 can be connected to the high potential end 10 of the high voltage bushing 14 of the test equipment 3 through the flange 8 and the connecting rod 11. Specifically, the flange 8 is divided into an upper pressure equalizing flange and a lower pressure equalizing flange. The flanges are respectively installed on the top of the connecting rod 11 and the high potential end 10 to play a fixed role; the flange 8 is designed with a semicircular bracket for supporting and installing the pressure equalizing mechanism. During transportation, the entire pressure equalizing device is connected and fixed by the upper pressure equalizing flange and the high potential end to reduce the height of the whole equipment, while in the test use, the lower pressure equalizing flange is connected and fixed by the high potential end to maintain sufficient Safe insulation distance. the

In practice, the power parameters measured by the power parameter measurement unit can be selected according to actual control needs, and accordingly the devices included in the power parameter measurement unit and their respective installation positions need to be set accordingly. For example, in this embodiment, the power parameter measurement unit includes a partial discharge current sensor 5 , a field strength detection device 9 and a voltage sensor 2 . Among them, the partial discharge current sensor 5 is arranged on the equalizing mechanism 6 to measure the current differential value of the equalizing mechanism, and then indirectly measure the discharge capacity of the equalizing mechanism 6 to reflect the discharge condition of the equalizing mechanism 6 . The field strength detection device 9 is arranged on the voltage equalizing mechanism 6, and is used to measure the electric field strength at a predetermined distance outside the voltage equalizing mechanism 6, thereby reflecting the effect of the shielding voltage of the voltage equalizing mechanism 6, and serving as a protection against discharge and flashover Reference. The voltage sensor 2 is connected with the test equipment 3 and is used for measuring the ground potential value of the main voltage terminal of the test equipment 3 . the

According to the electrical parameter measured by the electrical parameter measuring unit, the operator can drive the compressed air driving device 1 accordingly to adjust the size of the pressure equalizing mechanism 6 . the

In order to improve efficiency, the device of the present invention also includes a controller, which may include an operation controller 12 and a logic controller 13, to respectively complete the operation function and the logic function in the controller function, and obtain the average value measured by the power parameter measurement unit. The discharge capacity of the pressure equalization mechanism 6, the electric field strength outside the pressure equalization mechanism 6 and the voltage value of the main pressure terminal of the test equipment 3 are weighted and calculated to simulate the state parameters of the pressure equalization mechanism 6 and drive the compressed air drive device 1 according to the state parameters Adjust the size of the pressure equalizing mechanism 6. the

It can be seen that the self-adaptive voltage equalization device provided by the embodiment of the present invention measures the relevant power parameters through the power parameter measurement unit, and the controller adaptively adjusts the size of the pressure equalization mechanism according to these power parameters, so that the pressure equalization mechanism meets the requirements of the test equipment. The pressure equalization requirements of the high potential end, which makes the initial volume of the entire self-adaptive pressure equalization device needn't be very large, which is convenient for transportation. After it is installed in the required place, the size of the pressure equalization mechanism can be adaptively adjusted according to the actual situation, and there is no need for Temporarily assemble the pressure equalizing mechanism. the

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention. the

Claims (9)

1. a self-adaptation pressure-equalizing device, for the local highfield in tip of shield test reactor equipment hot end, is characterized in that, comprising:

The balancer structure of dimension adjustable, is arranged on the hot end of the bushing of described testing equipment, and shields the local highfield in tip of this hot end;

Compressed air drive arrangement, is connected with described testing equipment, and communicates with described balancer structure by the gas channel in described bushing, to regulate the size of described balancer structure by inflating and exitting;

Electrical parameter measuring unit, for measuring the hot end of described testing equipment bushing and the electrical parameter of described balancer structure, drive described compressed air drive arrangement to regulate the size of described balancer structure so that follow-up according to described electrical parameter, until the electrical parameter that described electrical parameter measuring unit measures is in desired extent.

2. self-adaptation pressure-equalizing device as claimed in claim 1, is characterized in that, described balancer structure comprises top grading ring and bottom grading ring, and wherein, described bottom grading ring is near the hot end of the bushing of described testing equipment.

3. self-adaptation pressure-equalizing device as claimed in claim 2, is characterized in that, described top grading ring and bottom grading ring are made by macromolecular material fusion semiconductor material, and surface scribbles metal material.

4. self-adaptation pressure-equalizing device as claimed in claim 2 or claim 3, is characterized in that, in the time that described testing equipment participates in 500KV grade and the electric power mutual-inductor error test below 500KV grade, described compressed air drive arrangement is for inflating to described bottom grading ring; In the time that described testing equipment participates in 1000KV grade and electric power mutual-inductor error test more than 1000KV grade, described compressed air drive arrangement is for inflating to described bottom grading ring and top grading ring.

5. self-adaptation pressure-equalizing device as claimed in claim 4, it is characterized in that, the gas channel being connected with compressed air drive arrangement in described bushing comprises the first gas channel being connected with described bottom grading ring and the second gas channel being connected with described top grading ring.

6. self-adaptation pressure-equalizing device as claimed in claim 1, is characterized in that, described electrical parameter measuring unit comprises: partial discharge current sensor, field intensity sniffer and voltage sensor;

Wherein, described partial discharge current sensor is arranged on described balancer structure, for measuring the current differential value of described balancer structure, thereby indirectly measures the discharge capacity size of described balancer structure;

Described field intensity sniffer is arranged on described balancer structure, for measuring the electric field intensity at described balancer structure space outerpace preset distance place;

Described voltage sensor is connected with described testing equipment, for measuring the above earth potential value of main pressure side of described testing equipment.

7. self-adaptation pressure-equalizing device as claimed in claim 1, is characterized in that, described balancer structure is connected and keeps equipotential with the hot end of the bushing of described testing equipment with connecting link by ring flange.

8. self-adaptation pressure-equalizing device as claimed in claim 1, it is characterized in that, described device also comprises controller, be connected with electrical parameter measuring unit with described compressed air drive arrangement, for receiving the electrical parameter that described electrical parameter measuring unit measures, and drive described compressed air drive arrangement to regulate the size of described balancer structure according to described electrical parameter, until the electrical parameter that described electrical parameter measuring unit measures is in desired extent.

9. self-adaptation pressure-equalizing device as claimed in claim 8, it is characterized in that, described controller comprises arithmetic and control unit and logic controller, the magnitude of voltage of discharge capacity size, the electric field intensity of balancer structure outside and the main pressure side of testing equipment of the balancer structure that described arithmetic and control unit and logic controller measure described electrical parameter measuring unit is weighted and computing, simulate the state parameter of described balancer structure, and drive described compressed air drive arrangement to regulate the size of described balancer structure according to described state parameter.