CN217061743U

CN217061743U - Single-phase on-load tap changer

Info

Publication number: CN217061743U
Application number: CN202220686975.4U
Authority: CN
Inventors: 于兴益; 周杰
Original assignee: YIXING XINGYI SPECIAL TRANSFORMER CO Ltd
Current assignee: YIXING XINGYI SPECIAL TRANSFORMER CO Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-07-26
Anticipated expiration: 2032-03-28

Abstract

The utility model discloses a single-phase on-load tap changer, relating to the technical field of transformers, which comprises a first winding, a second winding and a three-phase on-load tap changer, the three-phase on-load tap-changer comprises a first sub-tap-changer, a second sub-tap-changer and a third sub-tap-changer, the first winding comprises a first basic winding, a first voltage regulating winding and a second voltage regulating winding, each tap in the first voltage regulating winding is connected with a corresponding voltage regulating contact in the first sub-tap switch, the second winding comprises a second basic winding, a third voltage regulating winding and a fourth voltage regulating winding, each tap in the third voltage regulating winding is respectively connected with a corresponding voltage regulating contact in the second sub-tap switch, and tapping taps in the second voltage regulating winding and the fourth voltage regulating winding are respectively connected with voltage regulating contacts in a third sub-tapping switch. The utility model discloses avoided having carried switch level voltage value to reach or the part surpasss the biggest rated voltage that on-load tap-changer can bear.

Description

Single-phase on-load tap changer

Technical Field

The utility model relates to a transformer technical field especially relates to a single-phase on-load tap changing transformer.

Background

In an industrial transformer, in order to make an output secondary side voltage adjustable, a method of setting a voltage-regulating tap turn in a primary side coil is generally adopted, and the potential of a turn of the transformer is changed by changing the effective turn number of the primary side coil, so that the adjustment of the output voltage is realized.

In a single-phase transformer of 10kV, particularly 35kV, a voltage-regulating tapped turn is generally provided in a primary coil, and the effective number of turns of the primary coil is changed by electrically switching with an on-load tap switch. Because the secondary side voltage regulation range is wide or very wide, the number of turns of each section of voltage regulation branch connection wire of the primary side coil is very large, and high potential (generally called on-load tap-changer stage voltage) is generated, the figure 1 shows that the voltage value of the stage reaches or partially exceeds the maximum rated stage voltage which can be borne by the on-load tap-changer, and the on-load tap-changer operates in an excess of the rated stage voltage, so that potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that, overcome prior art's shortcoming, provide a single-phase on-load tap changing transformer.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a single-phase on-load tap-changing transformer comprises a first winding, a second winding and a three-phase on-load tap-changer,

the three-phase on-load tap-changer comprises a first sub-tap-changer, a second sub-tap-changer and a third sub-tap-changer, each sub-tap-changer comprises a plurality of voltage-regulating contacts,

the first winding comprises a first basic winding, a first voltage regulating winding and a second voltage regulating winding, the first voltage regulating winding comprises tapping taps the number of which is consistent with that of the voltage regulating contacts of the first sub-tapping switch, each tapping tap in the first voltage regulating winding is respectively connected with the corresponding voltage regulating contact in the first sub-tapping switch,

the second winding comprises a second basic winding, a third voltage regulating winding and a fourth voltage regulating winding, the third voltage regulating winding comprises tap taps with the same number as the voltage regulating contacts of the second sub-tap switch, each tap in the third voltage regulating winding is respectively connected with the corresponding voltage regulating contact in the second sub-tap switch,

the second voltage regulating winding and the fourth voltage regulating winding respectively comprise tapping taps, the number of the tapping taps is one half of that of the voltage regulating contacts of the third sub-tapping switch, and the tapping taps in the second voltage regulating winding and the fourth voltage regulating winding are respectively connected with the voltage regulating contacts corresponding to the third sub-tapping switch.

As a preferred scheme of single-phase on-load tap changer, wherein: the first sub-tap changer, the second sub-tap changer and the third sub-tap changer each comprise ten adjusting contacts.

As a preferred scheme of single-phase on-load tap changer, wherein: the second voltage regulating winding and the fourth voltage regulating winding respectively comprise five tapping points, and in the third sub-tapping switch, the voltage regulating contacts corresponding to the tapping points of the second voltage regulating winding and the voltage regulating contacts corresponding to the tapping points of the fourth voltage regulating winding are arranged at intervals.

The utility model has the advantages that:

the utility model discloses with original single-phase on-load tap-changer adjustment for three-phase on-load tap-changer, the on-load switch level voltage that makes the side coil voltage regulation produce is equallyd divide by three sub-tap-changer that the three-phase has on-load tap-changer, avoids having on-load switch level voltage value to reach or the part surpasss the biggest rated class voltage that on-load tap-changer can bear to the normal operating of transformer has been guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic diagram of the connection between a winding and an on-load tap-changer in a conventional single-phase on-load tap-changing transformer;

fig. 2 is a schematic diagram of the connection between the windings of the single-phase on-load tap-changer and the on-load tap-changer provided by the present invention;

wherein: 1. a first sub tap changer; 2. a second sub tap changer; 3. a third sub tap changer; 4. a first primary winding; 5. a first voltage regulating winding; 6. a second voltage regulating winding; 7. a second primary winding; 8. a third voltage regulating winding; 9. and a fourth voltage regulating winding.

Detailed Description

In order that the present invention may be more clearly understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

Referring to fig. 2, a schematic diagram of a connection between a winding of a single-phase on-load tap-changer and an on-load tap-changer is provided in the embodiment of the present application. In this embodiment, the single-phase on-load tap-changer includes a first winding, a second winding and a three-phase on-load tap-changer.

Specifically, the three-phase on-load tap-changer comprises a first sub-tap-changer 1, a second sub-tap-changer 2 and a third sub-tap-changer 3. Each sub-tapping switch comprises ten voltage-regulating contacts, and the number of the ten voltage-regulating contacts is 1-10 in sequence.

The first winding includes a first primary winding 4, a first voltage regulating winding 5 and a second voltage regulating winding 6. Ten tap taps are included in the first voltage regulating winding 5, and the ten tap taps correspond to ten voltage regulating contacts in the first sub-tap switch 1 respectively. The number of ten tapping points in the first voltage regulating winding 5 is 1-10 correspondingly, and the ten tapping points are divided into two groups, and five adjacent tapping points form one group. Five tapping taps in one group are sequentially No. 1 tapping tap, No. 3 tapping tap, No. 5 tapping tap, No. 7 tapping tap and No. 9 tapping tap, and five tapping taps in the other group are sequentially No. 2 tapping tap, No. 4 tapping tap, No. 6 tapping tap, No. 8 tapping tap and No. 10 tapping tap. And a No. 1 tapping point in the first voltage regulating winding 5 is connected with a voltage regulating contact point with the label of 1 in the first sub-tapping switch 1, and the like.

The second winding comprises a second basic winding 7, a third regulating winding 8 and a fourth regulating winding 9. The third voltage regulating winding 8 includes ten tap taps, and the ten tap taps correspond to ten voltage regulating contacts in the second sub-tap switch 2 respectively. The labels of the ten tapping points in the third voltage regulating winding 8 are 1-10 in sequence and are divided into two groups, and five adjacent tapping points form one group. Five tap-taps in one group are tap-taps No. 1, tap-taps No. 3, tap-taps No. 5, tap-taps No. 7 and tap-taps No. 9 in turn, and five tap-taps in the other group are tap-taps No. 2, tap-taps No. 4, tap-taps No. 6, tap-taps No. 8 and tap-taps No. 10 in turn. And a No. 1 tap in the third voltage regulating winding 8 is connected with a voltage regulating contact with the label of 1 in the second sub-tap switch 2, and so on.

The second voltage regulating winding 6 and the fourth voltage regulating winding 9 each include five tap taps. The five tapping taps in the second voltage regulating winding 6 are a No. 1 tapping tap, a No. 3 tapping tap, a No. 5 tapping tap, a No. 7 tapping tap and a No. 9 tapping tap in sequence. Five tap taps in the fourth voltage regulating winding 9 are a tap No. 2, a tap No. 4, a tap No. 6, a tap No. 8 and a tap No. 10 in sequence. Five tap-offs in the second voltage regulating winding 6 are respectively and correspondingly connected with voltage regulating contacts with the

reference numbers

1, 3, 5, 7 and 9 in the third sub-tap switch 3, and five tap-offs in the fourth voltage regulating winding 9 are respectively and correspondingly connected with voltage regulating contacts with the

reference numbers

2, 4, 6, 8 and 10 in the third sub-tap switch 3.

By adopting the wiring mode, the on-load switch level voltage generated by voltage regulation of the primary side coil is uniformly distributed by the three sub-tap switches of the three-phase on-load tap switch, so that the condition that the value of the on-load switch level voltage reaches or partially exceeds the maximum rated level voltage which can be borne by the on-load tap switch is avoided, and the normal operation of the transformer is ensured.

In addition to the above embodiments, the present invention may have other embodiments; all the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. A single-phase on-load tap changing transformer is characterized in that: comprises a first winding, a second winding and a three-phase on-load tap-changer,

the three-phase on-load tap-changer comprises a first sub-tap-changer (1), a second sub-tap-changer (2) and a third sub-tap-changer (3), each sub-tap-changer comprises a plurality of voltage-regulating contacts,

the first winding comprises a first basic winding (4), a first voltage regulating winding (5) and a second voltage regulating winding (6), the first voltage regulating winding (5) comprises tap taps with the same number as that of voltage regulating contacts of the first sub-tap switch (1), each tap in the first voltage regulating winding (5) is respectively connected with the corresponding voltage regulating contact in the first sub-tap switch (1),

the second winding comprises a second basic winding (7), a third voltage regulating winding (8) and a fourth voltage regulating winding (9), the third voltage regulating winding (8) comprises tap taps with the same number of voltage regulating contacts as the second sub-tap switch (2), each tap in the third voltage regulating winding (8) is respectively connected with the corresponding voltage regulating contact in the second sub-tap switch (2),

the second voltage regulating winding (6) and the fourth voltage regulating winding (9) respectively comprise tap taps, the number of which is one half of the voltage regulating contact of the third sub-tap switch (3), and the tap taps of the second voltage regulating winding (6) and the fourth voltage regulating winding (9) are respectively connected with the voltage regulating contacts corresponding to the third sub-tap switch (3).

2. The single-phase on-load tap changer of claim 1, wherein: the first sub-tap changer (1), the second sub-tap changer (2) and the third sub-tap changer (3) each comprise ten adjusting contacts.

3. The single-phase on-load tap changer of claim 2, wherein: second voltage regulating winding (6) with fourth voltage regulating winding (9) all include five shunting and take a percentage, in third sub-tapping switch (3), with second voltage regulating winding (6) shunting takes a percentage correspond the voltage regulating contact with fourth voltage regulating winding (9) shunting takes a percentage correspond the voltage regulating contact interval sets up.