Capacity-adjusting power distribution transformation auxiliary device and capacity adjusting method
阅读说明：本技术 一种调容配电变压辅助装置及调容方法 (Capacity-adjusting power distribution transformation auxiliary device and capacity adjusting method ) 是由 陈治廷 邱靖雯 周浩然 吴寄 关静恩 张建 刘盼 刘奔 杨秋昀 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种调容配电变压辅助装置及调容方法,该装置包括配电变压器高压侧绕组一侧的高压侧调容辅助开关和设于配电变压器低压侧绕组的低压侧调容辅助开关,高压侧调容辅助开关的若干接口与一组高压侧绕组连接,配电变压器低压侧包括第一组低压侧绕组和与第一组低压侧绕组连接的第二组低压侧绕组,第一组低压侧绕组一端还与低压侧调容辅助开关第一组开关接口连接,第二组低压侧绕组一端还与低压侧调容辅助开关第二组开关接口连接。本发明仅需操作一次就能实现容量的调节,降低变压器内部操作引起的拉弧等情况,同时通过调容减少变压器损耗,节能环保。(The invention discloses a capacitance-adjusting distribution transformation auxiliary device and a capacitance-adjusting method, wherein the device comprises a high-voltage side capacitance-adjusting auxiliary switch arranged on one side of a high-voltage side winding of a distribution transformer and a low-voltage side capacitance-adjusting auxiliary switch arranged on a low-voltage side winding of the distribution transformer, a plurality of interfaces of the high-voltage side capacitance-adjusting auxiliary switch are connected with a group of high-voltage side windings, the low-voltage side of the distribution transformer comprises a first group of low-voltage side windings and a second group of low-voltage side windings connected with the first group of low-voltage side windings, one end of the first group of low-voltage side windings is also connected with a first group of switch interfaces of the low-voltage side capacitance-adjusting auxiliary switch, and one end of the second group of. The invention can realize the capacity adjustment only by one-time operation, reduce the arc discharge and other conditions caused by the internal operation of the transformer, reduce the loss of the transformer by adjusting the capacity, save energy and protect environment.)
1. The utility model provides a transfer appearance distribution vary voltage auxiliary device which characterized in that: the high-voltage side that includes distribution transformer high-voltage side winding one side is transferred and is held auxiliary switch and locate distribution transformer low-voltage side that low-voltage side winding was transferred and hold auxiliary switch, high-voltage side is transferred and is held a plurality of interfaces and a set of high-voltage side winding of auxiliary switch and be connected, distribution transformer low-voltage side includes first group low-voltage side winding and the second group low-voltage side winding of being connected with first group low-voltage side winding, first group low-voltage side winding one end still is transferred with the low-voltage side and is held first group switch interface connection of auxiliary switch, second group low-voltage side winding one end still is transferred with the low-voltage side and is held auxiliary switch second group switch interface connection, adjust high-voltage side simultaneously and transfer and hold auxiliary switch with the low-voltage side, form large.
2. The capacity-regulating distribution transformer auxiliary device of claim 1, wherein:
the high-voltage side capacitance-regulating auxiliary switch comprises a first group of switches and a second group of switches;
a first switch moving contact of the first group of switches is connected with a first-phase non-polar end of the high-voltage side winding, and a fixed contact is connected with a second-phase polar end of the high-voltage side winding; a second switch of the first group of switches is connected with a second-phase non-polar end of the high-voltage side winding, and a static contact is connected with a third-phase polar end of the high-voltage side winding; a third switch of the first group of switches is connected with a third-phase non-polar end of the high-voltage side winding, and a static contact is connected with a first-phase polar end of the high-voltage side winding;
a first switch moving contact of the second group of switches is connected with a first-phase non-polar end of the high-voltage side winding, and a fixed contact is connected with a second-phase non-polar end of the high-voltage side winding; the second switch moving contact of the second group of switches is connected with the second-phase non-polar end of the high-voltage side winding, and the static contact is connected with the third-phase non-polar end of the high-voltage side winding.
3. The capacity-regulating distribution transformer auxiliary device of claim 1, wherein: when the distribution transformer is adjusted to be large in capacity, the wiring form of the high-voltage side of the distribution transformer is delta wiring, the winding voltage is increased to be 1.732 times in a star connection mode, when the voltage of an external system is not changed, the current is also increased by 1.732 times, and the low-voltage side winding is only effective in the first group of low-voltage side windings.
4. The capacity-regulating distribution transformer auxiliary device of claim 1, wherein: when the distribution transformer is adjusted to be small in capacity, the high-voltage side wiring form of the distribution transformer is Y wiring, compared with triangular wiring, the winding voltage is reduced by 1.732 times, the current is correspondingly reduced by 1.732 times, and the first group of low-voltage side windings and the second group of low-voltage side windings are effective.
5. A capacity regulating method of a capacity regulating distribution transformer auxiliary device based on any one of claims 1 to 4, characterized in that: the method comprises the following steps:
when the distribution transformer is adjusted to be high-capacity, the high-voltage side wiring form of the distribution transformer is adjusted to be delta wiring through the high-voltage side capacitance adjusting auxiliary switch, the winding voltage is increased to be 1.732 times in a star wiring mode, and when the external system voltage is not changed, the current is also increased by 1.732 times; the low side winding is active only for the first set of low side windings;
when the distribution transformer is adjusted to be small in capacity, the high-voltage side wiring form of the distribution transformer is adjusted to be Y wiring through the high-voltage side capacitance adjusting auxiliary switch, compared with the triangular wiring, the winding voltage is reduced by 1.732 times, and the current is correspondingly reduced by 1.732 times; the first group of low-voltage side windings and the second group of low-voltage side windings are effective, so that the voltage output of the low-voltage side is ensured to be unchanged; the number of turns and the transformation ratio relation satisfy:
in the formula: u1 — high side voltage; u2 — low side voltage; n1 — number of high side winding turns; n2-number of low side winding turns; u2 is the target voltage.
Technical Field
The invention relates to an auxiliary device, in particular to a capacitance adjusting and power distribution transformation auxiliary device, and further relates to a capacitance adjusting method, and belongs to the technical field of capacitance adjusting of distribution transformers.
Background
The distribution transformer is an important device in a distribution network system and completes the final distribution task of power supply. The distribution transformer has large quantity and dispersed positions, various power supply load types and loads with large seasonal variation, such as flue-cured tobacco, irrigation, workshop processing and the like. If the configured distribution transformer capacity is fixed, the transformer capacity can meet the operation requirement when the transformer operates in a light load state; when the load is increased, the distribution transformer can run in an overload mode, the distribution transformer can generate heat seriously due to long-time overload running, the insulation of the distribution transformer can be reduced due to long-time overload running, and the transformer can break down. If a transformer with larger capacity is configured, although the operation requirement under the heavy load condition can be met, under most light load working conditions, the operation efficiency of the transformer is very low, so that the no-load loss is overlarge, the power supply efficiency of distribution transformer is not facilitated, the investment cost is also increased, the energy waste caused by the no-load loss reaches a huge number after daily accumulation, and adverse factors are brought to the economic operation of a power grid.
Based on this, how to adjust the distribution capacity according to the load change is a problem to be solved. The main technical means at present is realized by the Y-delta conversion of the high-voltage side of the distribution transformer and the series-parallel connection of a plurality of windings on the low-voltage side. However, in the traditional technology, 3 windings are arranged on the low-voltage side, the number of turns of the windings is changed through series-parallel combination, the wiring mode is complex, the number of change-over switches is too many, and faults are easily caused.
Disclosure of Invention
In order to solve the problems, the invention provides a capacitance-adjusting distribution transformation auxiliary device and a capacitance-adjusting method, the operation of a capacitance-adjusting switch is realized by simplifying the wiring mode of a low-voltage winding and utilizing an auxiliary device, the capacity adjustment can be realized only by operating a high-voltage side and a low-voltage side once, the operation is convenient, the principle is simple, and the capacitance-adjusting distribution transformation auxiliary device has great popularization and application values.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a transfer appearance distribution vary voltage auxiliary device, transfer appearance auxiliary switch and locate the low pressure side of distribution transformer low pressure side winding and transfer appearance auxiliary switch including the high pressure side of distribution transformer high pressure side winding one side, a plurality of interfaces and a set of high pressure side winding that the high pressure side transferred appearance auxiliary switch are connected, the distribution transformer low pressure side includes first low pressure side winding and the second group low pressure side winding of being connected with first group low pressure side winding, first group low pressure side winding one end still with the low pressure side transfer appearance auxiliary switch first group switch interface connection, second group low pressure side winding one end still with the low pressure side transfer appearance auxiliary switch second group switch interface connection, adjust high pressure side transfer appearance auxiliary switch and low pressure side transfer appearance auxiliary switch simultaneously, form large capacity distribution transformer or small capacity distribution transformer.
Further, the high-voltage side capacitance-regulating auxiliary switch comprises a first group of switches and a second group of switches;
a first switch moving contact of the first group of switches is connected with a first-phase non-polar end of the high-voltage side winding, and a fixed contact is connected with a second-phase polar end of the high-voltage side winding; a second switch of the first group of switches is connected with a second-phase non-polar end of the high-voltage side winding, and a static contact is connected with a third-phase polar end of the high-voltage side winding; a third switch of the first group of switches is connected with a third-phase non-polar end of the high-voltage side winding, and a static contact is connected with a first-phase polar end of the high-voltage side winding;
a first switch moving contact of the second group of switches is connected with a first-phase non-polar end of the high-voltage side winding, and a fixed contact is connected with a second-phase non-polar end of the high-voltage side winding; the second switch moving contact of the second group of switches is connected with the second-phase non-polar end of the high-voltage side winding, and the static contact is connected with the third-phase non-polar end of the high-voltage side winding.
Further, when the distribution transformer is adjusted to a large capacity, the high-voltage side wiring form of the distribution transformer is delta wiring, the winding voltage is increased to 1.732 times in a star-connection mode, the current is also increased by 1.732 times when the external system voltage is not changed, and only the first group of low-voltage side windings are effective.
Further, when the distribution transformer is adjusted to be small in capacity, the wiring form of the high-voltage side of the distribution transformer is Y wiring, compared with triangular wiring, the winding voltage is reduced by 1.732 times, the current is correspondingly reduced by 1.732 times, and the first group of low-voltage side windings and the second group of low-voltage side windings are effective.
The capacity adjusting method based on the capacity adjusting distribution transformation auxiliary device is carried out as follows:
when the distribution transformer is adjusted to be high-capacity, the high-voltage side wiring form of the distribution transformer is adjusted to be delta wiring through the high-voltage side capacitance adjusting auxiliary switch, the winding voltage is increased to be 1.732 times in a star wiring mode, and when the external system voltage is not changed, the current is also increased by 1.732 times; the low side winding is active only for the first set of low side windings;
when the distribution transformer is adjusted to be small in capacity, the high-voltage side wiring form of the distribution transformer is adjusted to be Y wiring through the high-voltage side capacitance adjusting auxiliary switch, compared with the triangular wiring, the winding voltage is reduced by 1.732 times, and the current is correspondingly reduced by 1.732 times; the first group of low-voltage side windings and the second group of low-voltage side windings are effective, so that the voltage output of the low-voltage side is ensured to be unchanged; the number of turns and the transformation ratio relation satisfy:
in the formula: u1 — high side voltage; u2 — low side voltage; n1 — number of high side winding turns; n2-number of low side winding turns; u2 is the target voltage.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the high-low voltage measurement auxiliary switch is designed by simplifying the wiring mode of the low-voltage winding, the operation of the capacitance adjusting switch is realized by using the auxiliary switch, the capacity adjustment can be realized only by operating the high-voltage side and the low-voltage side once, the operation is convenient, the principle is simple, and the high-low voltage capacitance adjusting circuit has great popularization and application values.
(2) The invention switches through the external capacitance adjusting auxiliary device, reduces the arc discharge and other conditions caused by the internal operation of the transformer, reduces the loss of the transformer through capacitance adjustment, and is energy-saving and environment-friendly.
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 the drawings without creative efforts.
FIG. 1 is a schematic diagram of a capacity-adjusting and distribution-changing structure of the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
As shown in fig. 1, the capacitance-adjusting distribution transformation auxiliary device of the present embodiment includes a high-voltage side capacitance-adjusting auxiliary switch 1 on the high-voltage side winding W121 side of a distribution transformer 2 and a low-voltage side capacitance-adjusting auxiliary switch 3 provided on the low-voltage side winding of the distribution transformer 2.
The high-voltage side capacitance-regulating auxiliary switch 1 comprises a mechanical switch K1111 and a mechanical switch K1212, and the distribution transformer 2 comprises a high-voltage side winding W121, an iron core F22, a first group of low-voltage side windings W2123 and a second group of low-voltage side windings W2224; the low-voltage side capacitance-regulating auxiliary switch 3 comprises a mechanical switch K2131 and a mechanical switch K2232.
A first switch moving contact of the mechanical switch K11 is connected with an A-phase non-polar end of the high-voltage side winding W121, and a fixed contact is connected with a B-phase polar end of the high-voltage side winding W121; a second switch of the mechanical switch K11 is connected with the B-phase non-polar end of the high-voltage side winding W121, and the static contact is connected with the C-phase polar end of the high-voltage side winding W121; a third switch of the mechanical switch K11 is connected with the C-phase non-polar end of the winding of the high-voltage side winding W121, and a static contact is connected with the A-phase polar end of the winding of the high-voltage side winding W121; the first switch moving contact of the mechanical switch K12 is connected with the a-phase nonpolar end of the high-voltage side winding W121, and the fixed contact is connected with the B-phase nonpolar end of the high-voltage side winding W121.
The moving contact of the second switch of the mechanical switch K12 is connected to the B-phase non-polar end of the high-voltage side winding W121, and the stationary contact is connected to the C-phase non-polar end of the high-voltage side winding W121.
The low-voltage side of the distribution transformer 2 comprises a first group of low-voltage side windings W2123 and a second group of low-voltage side windings W2224 connected with the first group of low-voltage side windings W2123 in series, one end of the first group of low-voltage side windings W2123 is further connected with a mechanical switch K2131 of the low-voltage side capacitance adjusting auxiliary switch, one end of the second group of low-voltage side windings W2224 is further connected with a mechanical switch K2232 of the low-voltage side capacitance adjusting auxiliary switch, and the mechanical switch K2131 is connected with the second group of low-voltage side windings W2224 and the mechanical switch K2232 in parallel.
In this embodiment, based on the capacitance adjusting method for the capacitance adjusting power distribution transformation auxiliary device, the following steps are performed:
1. form a high-capacity distribution transformer
And (3) closing a mechanical switch K11 of the high-voltage side capacitance-regulating auxiliary switch 1, disconnecting a mechanical switch K12, closing a mechanical switch K21 of the low-voltage side capacitance-regulating auxiliary switch, and disconnecting a mechanical switch K22 to form the high-capacity distribution transformer.
2. Form a small-capacity distribution transformer
And closing a mechanical switch K12 of the high-voltage side capacitance regulating switch, opening a mechanical switch K11, closing a mechanical switch K22 of the low-voltage side capacitance regulating auxiliary switch, and opening a mechanical switch K21 to form the low-capacity distribution transformer.
The transformer capacity calculation formula is as follows:
S-transformer capacity
Rated line voltage of U-transformer
I-rated line current of transformer
When the distribution transformer is adjusted to be large-capacity, the mechanical switch K11 is closed, the mechanical switch K12 is opened, the mechanical switch K21 is closed, and the mechanical switch K22 is opened, at the moment, the wiring form of the high-voltage side of the distribution transformer is △ wiring, namely UThread=UPhase (C)The winding voltage is increased to 1.732 times in the star connection mode, and the voltage of an external systemWhen the current is unchanged, the current is also increased by 1.732 times; the low-voltage side winding is only W21 active and is connected into the system. According to (1), the available capacity is increased by 3 times.
When the distribution transformer is adjusted to be in a small capacity, the mechanical switch K12 is closed, the mechanical switch K11 is opened, the mechanical switch K22 is closed, and the mechanical switch K21 is opened. At the moment, the wiring form of the distribution transformer high-voltage side is Y wiring, compared with triangular wiring, the winding voltage is reduced by 1.732 times, and the current is correspondingly reduced by 1.732 times; in this embodiment, the high-voltage side is a 10kV grid system, and in order to ensure that the voltage output of the low-voltage side is still 0.4kV, the windings W21 and W22 should be connected to the system.
At this time, in order to keep the voltage unchanged, the relationship between the number of turns and the transformation ratio should satisfy:
in the above formula:
u1 — high side voltage;
u2 — low side voltage;
n1 — number of high side winding turns;
n2-number of low side winding turns;
when the high-voltage side voltage is changed from a △ wiring form to a star Y wiring form, U1 is reduced by 1.732 times, the number of turns of N1 is unchanged, N2 needs to be changed and increased by 1.732 times, namely W21 and W22 are connected in series, and the numerical relation has a constraint relation that 1.732N is usedW21=（NW21+NW22) And (5) after simplification: n is a radical ofW22=0.732NW21. Wherein N isW21Indicating the number of turns, N, of winding W21W22Indicating the number of turns of W22.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.