CN115424842A - On-load voltage regulation loop and voltage regulation method of dry-type transformer - Google Patents
On-load voltage regulation loop and voltage regulation method of dry-type transformer Download PDFInfo
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- CN115424842A CN115424842A CN202210905091.8A CN202210905091A CN115424842A CN 115424842 A CN115424842 A CN 115424842A CN 202210905091 A CN202210905091 A CN 202210905091A CN 115424842 A CN115424842 A CN 115424842A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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Abstract
The invention relates to a voltage regulation technology of a dry-type transformer, in particular to an on-load voltage regulation loop and a voltage regulation method of the dry-type transformer, which comprise a gear selection switch, a vacuum change-over switch and a transition resistor, wherein the gear selection switch is connected with a voltage regulation tap of a high-voltage winding of the transformer, the gear selection switch connected with a first part of the high-voltage winding selects one voltage regulation tap of the first part of windings of the transformer through a plurality of states, the common end of the gear selection switch is connected with one end of a normally closed switch of the vacuum change-over switch, and the other end of the normally closed switch is connected with the common end of a gear selection switch of a second part of the windings; the other end of the gear selection switch connected with the second part of the high-voltage winding of the transformer is respectively connected with the first voltage regulating tap and the last voltage regulating tap of the second part of the high-voltage winding of the transformer; the voltage regulating loop and the method enable the high-reliability permanent magnet mechanism switch to be applied to on-load voltage regulation of the dry type transformer, simplify the circuit of the dry type voltage regulator and reduce the equipment cost.
Description
Technical Field
The invention relates to a voltage regulation technology of a dry-type transformer, in particular to an on-load voltage regulation loop of the dry-type transformer and a voltage regulation method.
Background
The distribution transformer is the key equipment for the power grid to supply power for the last 500 meters to users, is large in quantity and wide in range, and has safe and economic operation which is related to national and civil life and influences thousands of households. The peak-valley difference of the electric load in China is large, the voltage fluctuation is large, the voltage is out of limit, and along with the improvement of the requirement of people on the power supply quality, the mode of replacing a non-excitation voltage regulating switch and a manual short-circuit coil tap voltage regulating mode by using an on-load voltage regulating switch becomes an inevitable trend.
At present, an oil immersed type high-reliability permanent magnet mechanism on-load voltage regulation method is being popularized on a large scale in a power distribution network, and although the application amount of a dry-type transformer is huge, the on-load voltage regulation method has the following problems and cannot be applied in large scale: 1. the voltage regulation technology is converted from a high-voltage grade on-load voltage regulation method, the circuit is complex, the arrangement of vacuum bubbles, isolating switches and the like is more, and the price is high; 2. in the aspect of an operating mechanism: the dry type voltage regulating switch adopts a motor drive and spring operating mechanism to realize voltage regulation, and has complex parts and matching and poor reliability. 3. When the motor driving and spring operating mechanism regulates the voltage, the gear can be shifted along the straight line or circular continuous motion, while the permanent magnetic mechanism can only have two positions of opening and closing, and the voltage regulating method can not be adopted. 4. The winding of the dry type transformer is different from the oil immersed type in the manufacturing process, the voltage regulating tap is arranged in the middle, and the voltage regulating principle of the oil immersed type permanent magnet mechanism is not suitable for the dry type transformer.
Therefore, it is very important to design a voltage regulating method using a high-reliability permanent magnetic mechanism switch.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the on-load voltage regulation loop and the voltage regulation method of the dry type transformer, so that the high-reliability permanent magnet mechanism switch can be applied to the on-load voltage regulation of the dry type transformer, the circuit of the dry type voltage regulator is simplified, and the equipment cost is reduced.
The technical scheme adopted by the invention is as follows:
an on-load voltage regulation loop of a dry type transformer comprises a high-voltage winding of the dry type transformer, a voltage regulation tap of the high-voltage winding, a gear selection switch, a vacuum change-over switch and a transition resistor.
And the gear selection switch is connected with a voltage regulating tap of a high-voltage winding of the dry-type transformer. The gear selection switch connected with the first winding part can select one voltage-regulating tap of the first winding part of the transformer through a plurality of state selections, the common end of the gear selection switch is connected with one end of a normally closed switch of the vacuum change-over switch, and the other end of the normally closed switch is connected with the common end of the gear selection switch of the second winding part. The other end of the gear selection switch of the second winding part is respectively connected with the first voltage regulating tap and the last voltage regulating tap of the second winding part.
The vacuum change-over switch consists of a normally open switch and a normally closed switch, and one end of the normally open switch of the vacuum change-over switch is connected with the tail end of the first part of the high-voltage winding of the transformer. The other end of the resistor is connected with a tail voltage regulating tap of the second part of the winding through a resistor. The two switches are controlled by the same electromagnet.
The gear selection switch is composed of a plurality of common copper-tungsten contact air switches, each switch can achieve the function of respectively conducting two loops, and each switch is controlled by an electromagnet.
The on-load voltage regulation process of the dry type transformer comprises the following steps: firstly, a normally open switch of the vacuum change-over switch is closed, so that a transition resistance loop is communicated with a first part and a second part of a winding, the first part and the second part of the winding which are communicated with a normally closed switch of the vacuum change-over switch through a gear selection switch form a parallel loop, power is supplied, and the transition resistance limits the internal circulation of the winding. And then the normally closed switch of the vacuum change-over switch is switched off, so that a loop where the gear selection switch is positioned is powered off, and the transition resistance loop supplies power to keep power continuity. And then the gear selection switch selects the voltage regulating taps of the windings of the first part and the second part in a combined mode in a conducting state under the condition of no electricity, so that the voltage regulating gear selection function is completed, and electric arcs cannot be generated in the switching action. When the switch action is finished, the normally closed switch in the vacuum switch is closed, and the double-loop parallel power supply state is formed. And finally, a normally open switch of the vacuum switch is disconnected with the transition resistance loop, and power is supplied to a loop where the normally closed switches of the gear selection switch and the vacuum change-over switch are located.
The invention has the beneficial effects that:
1. according to the on-load voltage regulation loop and the voltage regulation method of the dry type transformer, only 2 vacuum bubbles are adopted, the selection switch adopts the copper-tungsten alloy contact to resist ablation, the action can still be reliably carried out when the main vacuum switch, namely a normally open switch in the vacuum transfer switch, breaks down, and a user can judge the faults such as air leakage of the vacuum switch through electric arcs, so that a middle isolation switch of a traditional 'conducting type' voltage regulation switch of the dry type transformer is replaced, the volume of equipment is reduced, and the cost of the equipment is reduced.
2. The on-load voltage regulation loop and the voltage regulation method of the dry-type transformer are characterized in that switches related to the loop are regulated by switching on and switching off, and the permanent magnet mechanism is designed aiming at the characteristic that the permanent magnet mechanism only has two position states of switching on and switching off, so that the permanent magnet mechanism is suitable for on-load voltage regulation of the dry-type transformer.
3. The on-load voltage regulation loop and the voltage regulation method of the dry-type transformer are designed aiming at the characteristic that the coil voltage regulation tap of the dry-type transformer is arranged in the middle, and are more suitable for the dry-type transformer although the on-load voltage regulation loop can be used for the oil-immersed transformer. The oil-immersed transformer has the possibility of being combustible and explosive due to the existence of oil, and the on-load voltage regulation method also plays a more important role along with the fact that the dry-type transformer is applied to the interior of urban buildings in a large amount due to the fact that oil is not atomized.
Drawings
Fig. 1 is a schematic view of an on-load voltage regulation loop structure of a dry-type transformer according to the present invention;
FIG. 2 is a schematic diagram of the process and principle of the on-load voltage regulation method of the dry-type transformer of the present invention;
fig. 3 shows a transition circuit of a dry vacuum voltage regulating switch: wherein, (a) three vacuum contact "basic type" transition circuits; (b) The single-isolation double-vacuum-contact 'conducting type' transition circuit.
Detailed Description
In order to make the technical idea and advantages of the invention for realizing the object of the invention more clearly understood, the technical solution of the invention is further described in detail with reference to the accompanying drawings. It should be understood that the following examples are only for illustrating and explaining preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention as claimed in the claims.
Example 1
The invention relates to an on-load voltage regulation loop of a dry type transformer, which comprises a high-voltage winding of the dry type transformer, a voltage regulation tap thereof, a gear selection switch, a vacuum change-over switch and a transition resistor, wherein the gear selection switch is connected with the voltage regulation tap of the high-voltage winding of the dry type transformer, and the vacuum change-over switch comprises a normally open switch and a normally closed switch; the gear selector switch is connected with the first part of the high-voltage winding of the transformer, one of voltage regulating taps of the first part of the winding of the transformer can be selected through a plurality of state selections, the common end of the gear selector switch is connected with one end of a normally closed switch of the vacuum selector switch, and the other end of the normally closed switch of the vacuum selector switch is connected with the common end of the gear selector switch of the second part of the winding; the other end of the gear selection switch connected with the second part of the high-voltage winding of the transformer is respectively connected with the first voltage regulating tap and the last voltage regulating tap of the second part of the high-voltage winding of the transformer; one end of a normally open switch of the vacuum change-over switch is connected with the tail end of the first part of the high-voltage winding of the transformer; the other end of the transformer is connected with a tail voltage regulating tap of the second part of the high-voltage winding of the transformer through a transition resistor.
The transformer is mostly three-phase, and its pressure regulating principle is synchronous control three-phase high voltage winding number of turns, and the transformer low voltage winding number of turns is unchangeable, only can adjust transformer high, low voltage winding turn ratio through adjusting high voltage winding number of turns like this, realizes the pressure regulating. Therefore, the voltage regulating principle can be simplified into a high-voltage single-phase winding circuit. Therefore, the schematic diagram of the voltage regulating circuit and the voltage regulating method of the invention can be simplified into the circuit schematic diagram shown in fig. 1 (taking a 5-gear voltage regulating circuit as an example).
In this embodiment, a 5-stage voltage regulating circuit is taken as an example, and the circuit includes a dry-type transformer high-voltage winding AX and voltage regulating taps X6, X4, X2, X3, X5, and X7 thereof, gear selector switches 1K, 2K, and 3K, vacuum selector switches ZK1 and ZK2, and a transition resistor RA.
The gear selection switch is composed of a plurality of common copper-tungsten contact air switches 1K, 2K and 3K, each switch can achieve the function that two loops can be respectively conducted, as shown in the figure 1K, X6 or X4 can be conducted, and the 1K, 2K and 3K are controlled by an independent permanent magnet mechanism electromagnet; the vacuum change-over switch consists of a normally open switch ZK1 and a normally closed switch ZK2, and the two switches are controlled by the same electromagnet.
And the gear selector switches 1K, 2K and 3K are connected with a voltage regulating tap of a high-voltage winding of the dry-type transformer. The gear selector switches 1K and 2K connected with the first portion AX2 of the winding can select one voltage regulating tap X6 or X4 or X2 of the AX2 through state selection, the common end of the gear selector switches is shown in the figure, the 2K common end is connected with one end of a normally closed switch ZK2 of the vacuum selector switch, and the other end of the normally closed switch ZK2 is connected with the 3K common end of the gear selector switch of the second portion of the winding. The other end of the winding second part gear selector switch 3K is connected to the first and last voltage regulation taps X3 and X7 of the winding second part X3X, respectively.
One end of a normally open switch ZK1 of the vacuum change-over switch is connected with the tail end X2 of the first part AX2 of the high-voltage winding of the transformer. The other end is connected with a tail voltage regulating tap of the second part of the winding through a resistor RA.
If the gear selecting switch in the definition diagram is switched on upwards and switched off downwards, different combinations represent the following meanings: 1K, 2K and 3K are divided into 5 th gear, and the output voltage of the transformer is the highest; 1K, 2K and 3K are divided into 4 th gear; 1K, 2K and 3K are divided into 3 rd gear; 1K, 2K and 3K are combined into the 2 nd gear; the output voltage of the 1K-th gear transformer is the lowest in the 1K-th gear, the 2K-th gear and the 3K-th gear.
Example 2
In this embodiment, the method for implementing on-load voltage regulation of the dry-type transformer by using the on-load voltage regulation loop of the dry-type transformer is as follows:
firstly, closing a normally open switch of a vacuum change-over switch to enable a transition resistance loop to be communicated with a first part and a second part of a winding, forming a parallel loop with the first part and the second part of the winding communicated with the normally closed switch of the vacuum change-over switch through a gear selection switch, supplying power, and limiting the internal circulation of the winding through the transition resistance;
then, a normally closed switch of the vacuum transfer switch is switched off, so that a loop where the gear selection switch is located is powered off, and a transition resistance loop supplies power to keep power continuity; then the gear selection switch selects the voltage regulating taps of the windings of the first part and the second part in a combined mode in a conducting state under the condition of no electricity, and the voltage regulating gear selection function is completed; after the switch action is finished, the normally closed switch in the vacuum switch is closed to form the double-loop parallel power supply state;
and finally, the normally open switch of the vacuum switch disconnects the transition resistance loop and recovers power supply for the loop where the normally closed switch of the gear selection switch and the vacuum change-over switch is located.
As shown in fig. 2, the voltage regulation process of the invention is that the voltage of the dry-type transformer is regulated from 2-gear to 1-gear:
normal state in gear 2 as in FIG. 2
Firstly, a normally open switch ZK1 of a vacuum change-over switch is closed firstly, so that a transition resistor RA loop is communicated with a first part and a second part of a winding, the first part and the second part of the winding are communicated with a normally closed switch ZK2 of the vacuum change-over switch through gear selection switches 1K, 2K and 3K to form a parallel loop, power is supplied simultaneously, the transition resistor RA limits the internal circulation of the winding, and then the winding enters a state
. And then a normally closed switch ZK2 of the vacuum change-over switch is switched off, so that the loops where the gear selection switches 1K, 2K and 3K are positioned are powered off, the loop of the transition resistor RA is powered on to keep power supply continuity, and then the vacuum change-over switch enters a state (3). Then the gear selection switch selects the first part and the second part of winding voltage regulation taps through the combination of conduction states under the condition of no electricity, and the example finishes 1K-division and 2K-divisionThe voltage-regulating gear selection function of 3K switching is realized, and the switching action can not generate electric arc, so that the motor enters a state
. After the switch action is finished, the normally closed switch ZK2 in the vacuum switch is closed to form the double-loop parallel power supply state of the state, and then the vacuum switch enters the state
. Finally, the normally open switch of the vacuum switch disconnects the transition resistance loop and recovers the power supply for the loop where the normally closed switch of the gear selection switch and the vacuum change-over switch is located, and then the vacuum switch enters the state of the schematic diagram
。
By adopting the voltage regulating loop and the voltage regulating method, the circuit structure of the dry voltage regulator is simplified, the equipment cost is reduced, and the high-reliability permanent magnetic mechanism switch is applied to the on-load voltage regulation of the dry transformer.
Compared with the on-load voltage regulating circuit of the conventional dry-type transformer, the on-load voltage regulating circuit of the dry-type transformer is described as follows: as shown in fig. 3, the transition circuit for vacuum voltage regulation of the dry-type transformer is converted from the early "basic type" transition circuit to the current "conducting type" transition circuit, that is, the original single-resistor three-vacuum-contact "basic type" transition circuit is gradually replaced by the single-resistor single-isolation transition contact and the two-vacuum-contact "conducting type" transition circuit. In the "basic" type of transition circuit, the vacuum tube C is the heaviest task to be opened and closed, and if damaged, it will cause an inter-stage short circuit. The isolation conversion contact S in the 'lead type' circuit is fixedly connected with a main on-off contact (a vacuum tube H) in series, and if the vacuum contact H breaks down, the arc can not be cut off, and the fault can not be caused. At the moment, the single isolation switching contact connected in series with the switching device generates cut-off electric arcs when switching, so that the arc light ignited by the switching contact can be collected, and gas is generated to judge whether the vacuum tube H has a fault. According to the voltage regulating circuit, 2 vacuum bubbles are adopted, the selection switch is made of copper-tungsten alloy, when the main vacuum switch ZK2 breaks down, the operation can still be reliably performed, and a user can judge the faults such as air leakage of the vacuum switch through electric arcs, so that the traditional isolating switch contact of the 'lead-variant' switch is replaced.
In view of the possibility of combustible and explosive oil of the oil-immersed transformer, the on-load voltage regulation method plays a more important role along with the fact that the dry-type transformer is applied to the interior of urban buildings in large quantities due to the fact that oil is not available.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the invention. Other modifications of the invention will occur to those skilled in the art without the benefit of this disclosure and it is intended to cover within the scope of the invention any modifications that fall within the spirit and scope of the invention or the equivalents thereof which may be substituted by one of ordinary skill in the art without departing from the scope of the invention.
Claims (7)
1. The utility model provides a dry-type transformer on-load voltage regulation return circuit, includes dry-type transformer high voltage winding and the voltage regulation of taking a percentage, keeps off position selector switch, vacuum change over switch and transition resistance, keep off position selector switch and take a percentage with dry-type transformer high voltage winding voltage regulation and be connected its characterized in that: the vacuum change-over switch comprises a normally open switch and a normally closed switch; the gear selector switch is connected with the first part of the high-voltage winding of the transformer, one of voltage regulating taps of the first part of the winding of the transformer can be selected through a plurality of state selections, the common end of the gear selector switch is connected with one end of a normally closed switch of the vacuum selector switch, and the other end of the normally closed switch of the vacuum selector switch is connected with the common end of the gear selector switch of the second part of the winding; the other end of the gear selection switch connected with the second part of the high-voltage winding of the transformer is respectively connected with the first voltage regulating tap and the last voltage regulating tap of the second part of the high-voltage winding of the transformer; one end of a normally open switch of the vacuum change-over switch is connected with the tail end of the first part of the high-voltage winding of the transformer; the other end of the transformer is connected with a tail voltage regulating tap of the second part of the high-voltage winding of the transformer through a transition resistor.
2. The on-load tap changing loop of a dry-type transformer as claimed in claim 1, wherein: the gear selection switch is composed of a plurality of common copper-tungsten contact air switches, each switch can achieve the function of respectively conducting two loops, and each switch is controlled by an electromagnet.
3. The on-load tap changing loop of a dry-type transformer as claimed in claim 1, wherein: and the normally open switch and the normally closed switch of the vacuum change-over switch are controlled by the same electromagnet.
4. The on-load tap changing loop of a dry-type transformer as claimed in claim 2, wherein: and the normally open switch and the normally closed switch of the vacuum change-over switch are controlled by the same electromagnet.
5. Dry transformer on-load tap changing circuit according to any of the claims 1-4, characterized in that: the voltage regulating principle of the three-phase transformer is the same as that of a high-voltage single-phase winding circuit, for example, a 5-gear voltage regulating circuit is used, a voltage regulating loop comprises a dry-type transformer high-voltage winding AX and voltage regulating taps X6, X4, X2, X3, X5 and X7 of the dry-type transformer high-voltage winding AX, a gear selector switch comprises a plurality of common copper-tungsten contact air switches 1K, 2K and 3K, the gear selector switches 1K, 2K and 3K are connected with the voltage regulating taps of the dry-type transformer high-voltage winding, the gear selector switches 1K and 2K connected with a first part AX2 of the winding can select one of the voltage regulating taps X6, X4 or X2 of the AX2 through state selection.
6. An on-load tap changing loop for a dry-type transformer as claimed in claim 5, wherein: the vacuum change-over switch consists of a normally open switch ZK1 and a normally closed switch ZK2, the common end of the gear selection switch is connected with one end of the normally closed switch ZK2 of the vacuum change-over switch, and the other end of the normally closed switch ZK2 is connected with the common end of the gear selection switch 3K of the second winding part; the other end of the winding second part gear selector switch 3K is respectively connected with a first voltage regulating tap X3 and a last voltage regulating tap X7 of a winding second part X3X; one end of a normally open switch ZK1 of the vacuum change-over switch is connected with the tail end X2 of the first part AX2 of the high-voltage winding of the transformer, and the other end of the normally open switch ZK is connected with a tail voltage regulating tap of the second part of the winding through a transition resistor RA.
7. An on-load tap-changing method for a dry-type transformer, which adopts the on-load tap-changing loop of the dry-type transformer in claim 1, and is characterized in that: the on-load voltage regulation process of the dry-type transformer comprises the following steps: firstly, closing a normally open switch of a vacuum change-over switch to enable a transition resistance loop to be communicated with a first part and a second part of a winding, forming a parallel loop with the first part and the second part of the winding communicated with the normally closed switch of the vacuum change-over switch through a gear selection switch, supplying power, and limiting the internal circulation of the winding through the transition resistance; then, a normally closed switch of the vacuum transfer switch is switched off, so that a loop where the gear selection switch is located is powered off, and a transition resistance loop supplies power to keep power continuity; then the gear selection switch selects the voltage regulating taps of the first part and the second part of windings in a combined mode in a conducting state under the condition of no electricity, and the voltage regulating gear selection function is completed; after the switch action is finished, the normally closed switch in the vacuum switch is closed to form the double-loop parallel power supply state; and finally, the normally open switch of the vacuum switch disconnects the transition resistance loop and recovers power supply for the loop where the normally closed switch of the gear selection switch and the vacuum change-over switch is located.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210905091.8A CN115424842A (en) | 2022-07-29 | 2022-07-29 | On-load voltage regulation loop and voltage regulation method of dry-type transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210905091.8A CN115424842A (en) | 2022-07-29 | 2022-07-29 | On-load voltage regulation loop and voltage regulation method of dry-type transformer |
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| CN115424842A true CN115424842A (en) | 2022-12-02 |
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| CN202210905091.8A Pending CN115424842A (en) | 2022-07-29 | 2022-07-29 | On-load voltage regulation loop and voltage regulation method of dry-type transformer |
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- 2022-07-29 CN CN202210905091.8A patent/CN115424842A/en active Pending
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