CN202855519U - Power frequency single-phase resonance transformer used for calibrating and boosting voltage of voltage transformer on site - Google Patents

Abstract

The utility model discloses a power frequency single-phase resonance transformer used for calibrating and boosting the voltage of a voltage transformer on site. A resonance transformer main body (2) and a compensation adjustable reactor (14) are arranged inside a transformer outer shell (4), a coil (3) is arranged inside the resonance transformer main body (2), the coil (3) comprises a low-voltage winding (10), a medium-voltage compensation winding (12) and a high-voltage winding (9), and the medium-voltage compensation winding (12) is provided with a medium-voltage tap and is connected with the compensation adjustable reactor (14) through the medium-voltage tap. According to the power frequency single-phase resonance transformer, the medium-voltage tap is connected with the compensation adjustable reactor, an inductive component is introduced, the inside impedance of the resonance transformer can be adjusted, the resonance transformer is matched with a tested voltage transformer to form a resonance circuit, the input capacity of the low-voltage winding is effectively reduced, the size is small, the weight is light, the vehicle-mounting of the calibrating and voltage-boosting of the voltage transformer on site is achieved, and therefore the power frequency single-phase resonance transformer has wide application prospects.

Description

Power-frequency single-phase resonant transformer used for on-site verification and step-up of voltage transformers

technical field

The utility model relates to a power frequency single-phase resonant transformer used for on-site calibration and step-up of a 500 kV voltage transformer, which belongs to the technical field of high-voltage power transmission and transformation.

Background technique

With the deepening of the reform of the power industry system, the accuracy of high-voltage metering devices such as power transformers is directly related to the fairness and rapid development of the power market. For testing, the 500kV voltage transformer is a fixed-installation high-voltage equipment and can only be tested on-site. When calibrating the 500kV voltage transformer, it is necessary to increase the power frequency of the tested voltage transformer to the rated voltage to simulate the tested voltage transformer. The actual operating status of the voltage transformer is compared with the standard voltage transformer to realize the value transfer work of the national standard. The voltage transformers with a voltage level of 500 kV are mostly capacitive voltage transformers, which are capacitive at electrical frequencies. Moreover, the voltage transformer under test cannot be disconnected during the field test, and the entire busbar or GIS pipeline needs to be boosted together, so that the input capacity of the low-voltage winding is added to the ground capacitance, and the additional ground capacitance is the same as the busbar or GIS. The length of the pipeline, the environment of the test site, the layout of overhead lines, etc. are related. It is an irregular and discrete value, which will affect the detection accuracy of the 500kV voltage transformer.

Utility model content

The purpose of this utility model is to overcome the problems in the prior art, and provide a power frequency single-phase resonant transformer for on-site verification and boosting of voltage transformers, which is equipped with a medium-voltage compensation winding to introduce inductive components, and can adjust the inside of the resonant transformer Impedance, and matched with the capacitance of the tested voltage transformer to form a resonant test circuit, effectively reducing the input capacity of the low-voltage winding, and small in size and light in weight, it is convenient to realize the vehicle-mounted voltage transformer on-site calibration and boosting. Good application prospects.

In order to achieve the above object, the technical solution adopted in the utility model is:

A power frequency single-phase resonant transformer used for on-site verification and step-up of voltage transformers, including a high-voltage bushing and a transformer casing, the high-voltage bushing is located above the transformer casing, and is characterized in that: the inside of the transformer casing is equipped with The main body of the resonant transformer and the compensation adjustable reactor. The main body of the resonant transformer is provided with a wire package. The wire package includes a low-voltage winding, a medium-voltage compensation winding and a high-voltage winding. The medium-voltage compensation winding is provided with a medium-voltage tap, and through The medium voltage tap is connected with the compensation adjustable reactor.

The aforementioned power frequency single-phase resonant transformer used for on-site verification and boosting of voltage transformers is characterized in that: the wire wrap is connected to the fastener on one side of the main body of the resonant transformer through an insulating member.

The aforementioned power frequency single-phase resonant transformer used for on-site verification and step-up of voltage transformers is characterized in that: the wire package also includes iron core columns, and the low-voltage winding, medium-voltage compensation winding and high-voltage winding are connected from inside to outside Wrap around the iron core column in turn.

The aforementioned power frequency single-phase resonant transformer used for on-site verification and boosting of voltage transformers is characterized in that: the wire wrap is fixed inside the transformer shell by a wire wrap fixing frame.

The beneficial effects of the utility model are: the power frequency single-phase resonant transformer used for on-site verification and boosting of the voltage transformer provided by the utility model is equipped with a medium-voltage compensation winding, and the medium-voltage tap is connected with the compensation adjustable reactor It can adjust the internal impedance of the resonant transformer and match the capacitance of the tested voltage transformer to form a resonant test circuit, which can effectively reduce the input capacity of the low-voltage winding, and is small in size and light in weight. With anti-vibration measures, it is convenient to realize the vehicle-mounted on-site verification and boosting of 500 kV voltage transformers, and has a good application prospect.

Description of drawings

Fig. 1 is a structural schematic diagram of a power frequency single-phase resonant transformer used for on-site verification and step-up of a voltage transformer according to the present invention.

Fig. 2 is a schematic structural diagram of the main body of the resonant transformer of the present invention.

Fig. 3 is a schematic structural view of the wire bag of the present invention.

The meaning marks in the accompanying drawings are as follows:

1: High voltage bushing; 2: Main body of resonant transformer; 3: Wire package; 4: Transformer shell; 5: Fastener; 6: Insulator; 7: Iron core column; 8: Wire package fixing frame; 9: High voltage winding ; 10: low voltage winding; 11: compensation adjustable reactor; 12: medium voltage compensation winding.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings of the description.

As shown in Figure 1, Figure 2 and Figure 3, the power frequency single-phase resonant transformer used for on-site verification and boosting of voltage transformers of the utility model has a medium voltage compensation winding in the wire package, and the inductive component is introduced to adjust the resonance The internal impedance of the transformer, thereby effectively reducing the input capacity, reducing the volume and weight of the test equipment and realizing vehicle-mounted. The specific structure includes a high-voltage bushing 1 and a transformer shell 4. The high-voltage bushing 1 is located above the transformer shell 4. The transformer shell 4. There is a resonant transformer main body 2 and a compensation adjustable reactor 11 inside. The resonant transformer main body 2 is provided with a wire package 3. The wire package 3 includes a low-voltage winding 10, a medium-voltage compensation winding 12 and a high-voltage winding 9. The medium-voltage compensation winding 12 is provided with a medium-voltage tap, and is connected to the compensation adjustable reactor 11 through the medium-voltage tap, the compensation adjustable reactor 11 can adjust the inductance through the size of its air gap, and change the internal impedance of the entire resonant transformer, Make the internal impedance of the resonant transformer in an inductive state, and form a resonant state with the 500 kV voltage transformer under test, which is capacitive in the supplementary test circuit. At this time, the input capacity of the low-voltage winding is 1/Q times the capacity of the high-voltage winding, and Q is the test The quality factor of the loop can effectively reduce the input capacity of the low-voltage winding. The wire package 3 is connected to the fastener 5 on the side of the main body of the resonant transformer 2 through the insulator 6. The wire package 3 also includes the iron core column 7 and the low-voltage winding 10 , the medium-voltage compensation winding 12 and the high-voltage winding 9 are sequentially encircled on the iron core column 7 from the inside to the outside, and the wire package 3 is fixed inside the transformer shell 4 through the wire package fixing frame 8. The designed wire package 3 has a compact structure and a volume Small size and light weight are convenient for on-vehicle verification and boosting of voltage transformers. Here, the wire package fixing frame 8, transformer casing 4 and high-voltage bushing 1 are equipped with anti-vibration measures, and SF6 gas insulation is used to meet the vehicle-mounted requirements. It meets the needs of modernized design and has a good application prospect.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (4)

1. be used for the single-phase resonance transformer of power frequency that the voltage transformer field-checking boosts, comprise bushing (1) and transformer case (4), described bushing (1) is positioned at the top of transformer case (4), it is characterized in that: described transformer case (4) inside is provided with resonance transformer main body (2) and compensation Regulatable reactor (14), be provided with line bag (3) in the described resonance transformer main body (2), described line bag (3) comprises low pressure winding (10), middle pressure compensation winding (12) and high pressure winding (9), described middle pressure compensation winding (12) is provided with middle pressure tap, and is connected with described compensation Regulatable reactor (11) by middle pressure tap.

2. the single-phase resonance transformer of power frequency that boosts for the voltage transformer field-checking according to claim 1, it is characterized in that: described line bag (3) is connected with the securing member (5) of resonance transformer main body (2) one sides by insulating part (6).

3. the single-phase resonance transformer of power frequency that boosts for the voltage transformer field-checking according to claim 1, it is characterized in that: described line bag (3) also comprises iron core column (7), and described low pressure winding (10), middle pressure compensation winding (12) and high pressure winding (9) are looped around on the described iron core column (7) from inside to outside successively.

4. the single-phase resonance transformer of power frequency that boosts for the voltage transformer field-checking according to claim 1, it is characterized in that: described line bag (3) is fixed on transformer case (4) inside by line bag fixed mount (8).

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