CN217333827U

CN217333827U - Test measurement and control integrated test transformer

Info

Publication number: CN217333827U
Application number: CN202221305294.5U
Authority: CN
Inventors: 冯敏杰; 刘翩
Original assignee: Xi'an Apt Power Technology Co ltd
Current assignee: Xi'an Apt Power Technology Co ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-08-30
Anticipated expiration: 2032-05-27

Abstract

The utility model discloses an integrative experimental change of examination observing and controling, include: the insulating cylinder, the iron core, the coil and the capacitive voltage divider are integrally arranged in the insulating cylinder and are in an oil immersion state; the high-voltage output end of the coil is connected with the high-voltage terminal of the capacitive voltage divider and used as a common output end; the voltage sampling of the control box comes from an internal capacitive voltage divider, replacing the traditional measurement winding. The utility model discloses high-voltage output (experiment) that becomes with the experiment is integrated with control, demonstration, protection of capacitive voltage divider's high-pressure measurement and control box, has realized that the experiment becomes "examination and control" integrated design and application. Moreover, the structure of the device is simplified, the manufacturing cost of the device is reduced, the preparation time of the test is saved, the use is more convenient and faster, and the problem that the traditional test is changed into the capacitance rise of using a measuring winding for sampling is solved. Meanwhile, the structure opens up a wide application prospect for the insulation cylinder type test to be changed to the field.

Description

Test measurement and control integrated test transformer

Technical Field

The utility model relates to a power electronic technology field, power frequency high voltage, in particular to insulating cylinder, monomer structure, examination observe and control integrative experimental change.

Background

At present, domestic insulated barrel type transformers and capacitive voltage dividers for high voltage measurement are separately designed and separately arranged, as shown in fig. 1. The main disadvantages include: 1) for each test, the capacitive divider requires field assembly (base, corona shield, ground) and wiring, adding additional labor and preparation time; 2) although the test system introduced a capacitive voltage divider, the high voltage sampling of the control box of some systems was based on signals from the measurement coil (typically 100V). Due to the measurement and control separation, the capacity rise not only causes the difference between the high-voltage data of the control box and the high-voltage data of the voltage divider, but also possibly causes the overvoltage of the tested object. To solve this contradiction, the capacitive voltage division has become the standard for testing the high voltage measurement of the transformer. The insulation cylinder type test is changed to be a traditional device in a laboratory and a test hall in China, and is rarely used on site.

The tests for the field delivery test and the preventive test are almost all iron shell type tests. Deficiency of iron shell test: 1) the monomer test voltage is lower, and is generally below 150 KV; 2) the test current is small, generally below 1A; 3) the partial discharges are particularly high, many exceeding several thousand pc. The test transformer can not reach JB/T9641-1999, and the partial discharge of the test transformer is less than 10pc under 70% rated voltage; compared with the iron shell type test, the insulation cylinder type test is changed, the voltage grade can be made higher, and the current and the capacity can be made larger. More importantly, the insulating cylinder body replaces an iron shell type test variable high-voltage bushing, and partial discharge can be controlled to be lower than 5 pc.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an integrative experimental change of trying to observe and control is when simplifying production and field test procedure, has effectively solved the aeipatous illness of "trying to observe and control the separation" that experimental variable length period exists. Meanwhile, wide application prospect is opened up for the field application of the insulation cylinder test.

On the one hand, the embodiment of the utility model provides an integrative experimental change of examination observing and controling, include: the insulating cylinder, the iron core, the coil and the capacitive voltage divider are integrally arranged in the insulating cylinder and are in an oil immersion state; the high-voltage output end of the coil is connected with the high-voltage terminal of the capacitive voltage divider and used as a common output end; the voltage sampling of the control box comes from an internal capacitive voltage divider, replacing the traditional measurement winding. The utility model discloses high-voltage output (experiment) that becomes with the experiment is integrated with control, demonstration, protection of capacitive voltage divider's high-pressure measurement and control box, has realized that the experiment becomes "examination and control" integrated design and application.

The utility model provides an integrative experimental change of examination observing and controling has following advantage:

1. through system integration of the test transformer, the capacitive voltage divider and the control box, the structure and the structure of test equipment are optimized, the test flow is simplified, and the safety of a high-voltage test is improved;

2. the control box displays that the high voltage is the voltage added to the tested object, thereby eliminating the influence of the capacity rising effect and avoiding the overvoltage damage of the tested object caused by the capacity rising error;

3. the test and control are taken as an organic whole, the equipment is simpler and safer, and the production cost and the field use cost of the equipment are lower;

4. the test system of the test transformer and the capacitive voltage divider does not need to be assembled on site, so that the application of the insulating cylinder type test into the traditional laboratory can be carried to the site through various forms (such as an independent single body, a trolley and a vehicle-mounted system). The voltage-withstanding test device not only solves the difficult situation that the on-site power frequency voltage-withstanding test voltage is low and the test current is small, but also makes the on-site partial discharge test possible. The application prospect of the test site is greatly expanded;

drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a partial internal structure of a prior art insulation cartridge test transformer;

fig. 2 is the embodiment of the utility model provides a test observes and controls inside local structural schematic that integrative experiment becomes.

Description of reference numerals: 1-capacitive divider, 2-coil.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 2 is the embodiment of the utility model provides a test observes and controls inside local structural schematic that integrative experiment becomes. The embodiment of the utility model provides an integrative experimental change is observed and controled in examination, include: insulating cylinder, iron core, coil 2, capacitive voltage divider 1 and control box, iron core, coil 2 and capacitive voltage divider 1 all integrate in inside the insulating cylinder, the control box with capacitive voltage divider's high voltage terminal is connected, the control box is used for right capacitive voltage divider's high voltage output measures, control, shows and the protection.

Illustratively, the insulating cylinder is internally filled with insulating oil.

In fig. 2, a and X are low-voltage windings for test transformer, and a and X are high-voltage windings for test transformer. X is a high-voltage terminal shared by the test transformer and the voltage divider, and a tested object is externally connected with the high-voltage terminal. The principle of the capacitive voltage divider 1 for alternating current high voltage measurement is capacitive voltage division, so that different from electromagnetic PT, the capacitive voltage divider can influence an electromagnetic field to be tested or influence the measurement precision by the electromagnetic field of a transformer, and certainly, the capacitive voltage divider does not have the problem of mutual inductance. The output of the coil 2 and the capacitive divider 1 is equipotential, which creates conditions for integrating the capacitive divider 1 inside the insulating cylinder. One is that the capacitive divider 1 does not introduce any adverse effect on the output of the test variable because of its introduction inside; in the second test, the changed iron core and coil 2 can be infinitely close to the capacitive voltage divider 1 in physical distance, the diameter of the cylinder body of the insulating cylinder is reduced as much as possible, and the increase of the diameter of the insulating cylinder body is avoided due to the introduction of the capacitive voltage divider 1.

The output of the test transformer is not affected by the introduction of the capacitive divider 1, and the accuracy of the test transformer measurement is difficult. The accuracy of the measurement is ensured by considering the impedance of a voltmeter of the control box and the lead of the voltage divider to the control box. Debugging and calibrating are carried out on the premise of ensuring impedance matching; most insulating cylinder type test variants have the requirement of partial discharge measurement, and dielectric loss indexes of the voltage divider are listed in examination and acceptance; because the coil 2 and the capacitive voltage divider 1 are all integrated in the insulating cylinder, and integrated design and arrangement are adopted, the measuring coil of the novel test transformer is unnecessary, and a tap is omitted for a high-voltage coil of the test transformer, so that the structure is simpler.

The source of the high voltage signal of the test variable control box is not only to sample the voltage divider from the inside, but also to integrate the high voltage signal in the design stage in the aspects of impedance matching and lead wire selection of the voltmeter.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides an integrative experimental change is observed and controled in examination which characterized in that includes: insulating cylinder, iron core, coil (2), capacitive voltage divider (1) and control box, iron core, coil (2) and capacitive voltage divider (1) all integrate in inside the insulating cylinder, the control box with capacitive voltage divider's high voltage terminal is connected, the control box is used for right capacitive voltage divider's high voltage output is measured, is controlled, is shown and is protected.

2. The integrated testing and measuring transformer according to claim 1, wherein the insulating cylinder is filled with insulating oil.