CN110137909B - Method for protecting a step-up transformer and overvoltage protection device - Google Patents
Method for protecting a step-up transformer and overvoltage protection device Download PDFInfo
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- CN110137909B CN110137909B CN201910469276.7A CN201910469276A CN110137909B CN 110137909 B CN110137909 B CN 110137909B CN 201910469276 A CN201910469276 A CN 201910469276A CN 110137909 B CN110137909 B CN 110137909B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/055—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for tapped transformers or tap-changing means thereof
Abstract
The application relates to a method for protecting a regulating transformer and an overvoltage protection device. The method for protecting the voltage regulating transformer comprises the following steps: arranging a protective coil between a regulating transformer and an on-load tap-changer, wherein the regulating transformer comprises a first transformer coil and a second transformer coil which are separated; setting the rated voltage of the protection coil to a preset range, and setting the rated current of the protection coil to a preset value; one end of the protection coil is connected with the first transformer coil, and the other end of the protection coil is connected with the second transformer coil. An overvoltage protection device comprises a protection coil and an on-load tap-changer. The method for protecting the voltage regulating transformer and the overvoltage protection device can solve the problem that the voltage regulating transformer is easily damaged due to the damage of the on-load tap-changer in the traditional scheme.
Description
Technical Field
The present application relates to the field of power equipment technologies, and in particular, to a method for protecting a voltage regulating transformer and an overvoltage protection device.
Background
In the operation of the power system, the bus voltage inevitably varies, but the stable operation of the power system requires the bus voltage to vary within a certain range, and therefore, the bus voltage needs to be controlled in the power system.
When controlling the bus voltage in the power system, the regulating transformer is often used to regulate and control the bus voltage, specifically, the voltage is regulated by changing the tap of the power transformer. The on-load tap changer is used, so that a tap joint of one voltage of the transformer is switched to a tap joint of the other voltage under the condition that the transformer is on load, and a power user is ensured not to be powered off in the switching process. However, electronic devices in the on-load tap changer are easily damaged, and further overvoltage between two groups of taps of the voltage regulating transformer is caused, and the transformer is burnt.
Therefore, the damage of the on-load tap-changer in the traditional scheme is easy to cause the damage of the voltage regulating transformer.
Disclosure of Invention
Therefore, it is necessary to provide a method for protecting a voltage regulating transformer and an overvoltage protection device for solving the problem that the damage of the on-load tap-changer in the conventional scheme is easy to cause the damage of the voltage regulating transformer.
A method of protecting a regulating transformer, comprising:
arranging a protective coil between a regulating transformer and an on-load tap-changer, wherein the regulating transformer comprises a first transformer coil and a second transformer coil which are separated;
setting the rated voltage of the protection coil to a preset range, and setting the rated current of the protection coil to a preset value;
one end of the protection coil is connected with the first transformer coil, and the other end of the protection coil is connected with the second transformer coil.
The method for protecting the voltage regulating transformer comprises the following steps: arranging a protective coil between a regulating transformer and an on-load tap-changer, wherein the regulating transformer comprises a first transformer coil and a second transformer coil which are separated; setting the rated voltage of the protection coil to a preset range, and setting the rated current of the protection coil to a preset value; one end of the protection coil is connected with the first transformer coil, and the other end of the protection coil is connected with the second transformer coil. When the on-load tap-changer breaks down, the current output by the first transformer coil can enter the second transformer coil through the protection coil, so that overvoltage between the first transformer coil and the second transformer coil cannot be caused, and the voltage regulating transformer is prevented from being damaged. Therefore, the method for protecting the voltage regulating transformer can solve the problem that the voltage regulating transformer is easily damaged due to the damage of the on-load tap-changer in the traditional scheme.
In one embodiment, the setting the rated voltage of the protection coil to a preset range and the setting the rated current of the protection coil to a preset value includes:
setting a rated voltage of the protection coil equal to k (U)1-U2) Wherein said U is1For the maximum up-regulation voltage of the regulating transformer, U2The minimum down-regulation voltage of the voltage regulating transformer is obtained, wherein k is a reliable coefficient and the value range is 1 to 2;
setting a rated current of the protection coil equal to rated currents of the first transformer coil and the second transformer coil.
In one embodiment, the rated voltage of the protection coil is set to be equal to k (U)1-U2) The method comprises the following steps:
setting a rated voltage of the protection coil equal to (U)1-U2) Wherein said U is1For the maximum up-regulation voltage of the regulating transformer, U2And regulating the minimum voltage of the regulating transformer.
In one embodiment, one end of the protection coil is connected to the first transformer coil, and the other end of the protection coil is connected to the second transformer coil, including:
one end of the protection coil is connected with a third tap, wherein the first transformer coil comprises a first tap, a third tap and a fifth tap, and the differential pressure between the third tap and the first tap is equal to the differential pressure between the fifth tap and the third tap;
the other end of the protection coil is connected with a fourth tap, wherein the second transformer coil comprises a second tap, a fourth tap and a sixth tap, and the pressure difference between the fourth tap and the second tap is equal to the pressure difference between the sixth tap and the fourth tap.
An overvoltage protection device based on the method comprises the following steps:
a protection coil electrically connected between a first transformer coil and a second transformer coil, wherein the first transformer coil and the second transformer coil are disposed in the voltage regulating transformer,
the rated voltage of the protective coil is k (U)1-U2) Said U1For maximum up-regulation of the voltage of the regulating transformer, U2The minimum down-regulation voltage of the voltage regulating transformer is obtained, k is a reliable coefficient, and the value range of k is 1-2;
and the on-load tap-changer is electrically connected between the first transformer coil and the second transformer coil.
The application provides an overvoltage protection device for protecting a voltage regulating transformer. The on-load protection device comprises a protection coil and an on-load tap-changer, wherein the protection coil is electrically connected between the first transformer coil and the second transformer coil, and the rated voltage of the protection coil is k (U)1-U2) Said U1For maximum up-regulation of the voltage of the regulating transformer, U2And k is the minimum down-regulation voltage of the regulating transformer, and is a reliable coefficient, and the value range of k is 1 to 2. When the on-load tap-changer fails, current from the first transformer coil can enter the second transformer coil through the protection coil. The first transformer coil and the second transformer coilOvervoltage can not be generated between the transformer coils, so that the voltage regulating transformer can not be damaged. The application provides overvoltage protector can solve the problem that the damage of on-load tap-changer easily causes the voltage regulating transformer to damage among the traditional scheme.
In one embodiment, one end of the protection coil is electrically connected with a third tap, and the other end of the protection coil is connected with a fourth tap, wherein the first transformer coil comprises a first tap, a third tap and a fifth tap, and the pressure difference between the third tap and the first tap is equal to the pressure difference between the fifth tap and the third tap;
the second transformer coil includes a second tap, a fourth tap, and a sixth tap, a differential pressure of the fourth tap and the second tap being equal to a differential pressure of the sixth tap and the fourth tap.
In one embodiment, the value of k is 1, and the rated voltage of the protection coil is (U)1-U2)。
In one embodiment, the protective coil is a closed-loop iron core coil.
In one embodiment, the first transformer coil and the second transformer coil are further electrically connected with an alarm device, and the alarm device is used for prompting whether the differential pressure between the first transformer coil and the second transformer coil exceeds a set differential pressure range or not.
In one embodiment, the first transformer coil and the second transformer coil are further electrically connected with a power-off protection device.
Drawings
Fig. 1 is a schematic flowchart of a method for protecting a voltage regulating transformer according to an embodiment of the present application.
Fig. 2 is a schematic flowchart of a method for protecting a voltage regulating transformer according to an embodiment of the present application.
Fig. 3 is a schematic flowchart of a method for protecting a voltage regulating transformer according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of an overvoltage protection device according to an embodiment of the present application.
Fig. 5 is a schematic diagram of an overvoltage protection device provided by an embodiment of the present application.
Description of reference numerals:
On-load tap-changer 300
Power-off protection device 30
Detailed Description
The method for protecting the voltage regulating transformer and the overvoltage protection device are based on the fact that the voltage regulating transformer is easily damaged due to damage of the on-load tap-changer in the traditional scheme.
In order to make the objects, technical solutions and advantages of the present application more apparent, the following method for protecting a voltage regulating transformer and an overvoltage protection device of the present application are further described in detail by embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the present application provides a method for protecting a regulating transformer, including:
s100, arranging a protection coil between a voltage regulating transformer and an on-load tap-changer, wherein the voltage regulating transformer comprises a first transformer coil and a second transformer coil which are separated;
s200, setting the rated voltage of the protection coil to be a preset range, and setting the rated current of the protection coil to be a preset value;
and S300, connecting one end of the protection coil with the first transformer coil, and connecting the other end of the protection coil with the second transformer coil.
In a traditional scheme, a voltage regulating transformer is generally directly and electrically connected with an on-load tap-changer, and specifically, the on-load tap-changer is electrically connected with two unconnected coils inside the voltage regulating transformer. Normally, the current from one coil inside the tap changer passes through the on-load tap changer and then enters the other coil inside the tap changer. When the on-load tap-changer breaks down, the two coils are broken, and overvoltage damage inside the transformer is further caused. The method provided by the embodiment is that a protection coil is arranged between the voltage regulating transformer and the on-load tap-changer, one end of the protection coil is connected with the first transformer coil, and the other end of the protection coil is connected with the second transformer coil. When the on-load tap-changer has a fault, the voltage at two ends of the protection coil reaches saturation, so that the reactance of the protection coil is reduced instantly, and therefore the current from the first transformer coil can pass through the protection coil and then enter the second protection coil. At this time, no overvoltage is generated between the first transformer coil and the second transformer coil, so that the transformer is not damaged. The purpose of setting the rated voltage of the protection coil to be within a preset range and the purpose of setting the rated current of the protection coil to be within a preset value is to select coils suitable for the voltage regulating transformer and the on-load tap-changer so as to achieve the purposes of economy and practicability.
Referring to fig. 2, in an embodiment of the present application, the S200 includes:
s210, setting rated voltage of the protective coil to be equal to k (U)1-U2) Wherein said U is2The maximum up-regulated voltage of the regulating transformer is obtained, the U2 is the minimum down-regulated voltage of the regulating transformer, and k is a reliable coefficient and has a value range of 1 to 2;
s220, setting the rated current of the protection coil to be equal to the rated current of the first transformer coil and the second transformer coil.
If the rated voltage of the protective coil is chosen too large, the protective coil is too bulky, uneconomical and insensitive to overvoltage protection. If the nominal voltage of the protective coil is chosen too small, overvoltage protection can be misbehaving. Therefore, the rated voltage of the protection coil is selected to be equal to k (U)1-U2) So as to achieve the optimal effect of comprehensive balance.
In an embodiment of the present application, the S210 includes:
setting a rated voltage of the protection coil equal to (U)1-U2) Wherein said U is1For the maximum up-regulation voltage of the regulating transformer, U2And regulating the minimum voltage of the regulating transformer.
Setting a rated voltage of the protection coil to (U)1-U2) The volume allowed by the protective coil is minimal and the overvoltage protection is most sensitive. It can be seen that the maximum value of the ac voltage across the protective winding is (U) when the on-load tap changer is operating normally, regardless of which tap of the odd taps is connected to which tap of the even taps1-U2). Only a small excitation current flows in the protective coil.
Referring to fig. 3, in an embodiment of the present application, the S300 includes:
s310, one end of the protection coil is connected with a third tap, wherein the first transformer coil comprises a first tap, a third tap and a fifth tap, and the pressure difference between the third tap and the first tap is equal to the pressure difference between the fifth tap and the third tap;
and S320, connecting the other end of the protection coil with a fourth tap, wherein the second transformer coil comprises a second tap, a fourth tap and a sixth tap, and the pressure difference between the fourth tap and the second tap is equal to the pressure difference between the sixth tap and the fourth tap.
Referring to fig. 4, the present application further provides an overvoltage protection device based on the above method. The overvoltage protection device comprises a protective coil 100 and an on-load tap changer.
The protection coil 100 is electrically connected between a first transformer coil 210 and a second transformer coil 220, wherein the first transformer coil 210 and the second transformer coil 220 are disposed in the voltage-regulating transformer 200. The rated voltage of the on-load protection coil 100 is k (U)1-U2) Said U1For maximum up-regulation of the voltage-regulating transformerPress, the U2And k is the minimum down-regulation voltage of the regulating transformer, and is a reliable coefficient, and the value range of k is 1 to 2. The maximum up-regulation voltage and the minimum up-regulation voltage of different regulating transformers are different, and the value of k can also be selected according to actual needs, and the application is not limited.
The on-load tap changer 300 is electrically connected between the first transformer coil 210 and the second transformer coil 220. When the on-load tap-changer 300 and the protection coil 100 are connected to the first transformer coil 210 or the second transformer coil 220, different tap interfaces may be connected, or the same tap interface may be connected. The voltage across the protection coil 100 may be selected according to actual needs as long as the voltage does not exceed the rated voltage, and the application is not limited.
The present embodiment provides an overvoltage protection device 10 for protecting a voltage regulating transformer 200. The on-load protection device 10 includes a protection coil 100 and an on-load tap-changer 300, wherein the protection coil 100 is electrically connected between the first transformer coil 210 and the second transformer coil 220, and the rated voltage of the protection coil 100 is k (U)1-U2) Said U1For maximum up-regulation of the voltage of the regulating transformer, U2And k is the minimum down-regulation voltage of the regulating transformer, and is a reliable coefficient, and the value range of k is 1 to 2. When the on-load tap-changer 300 fails, the current from the first transformer coil 210 can enter the second transformer coil 220 through the protection coil 100. No overvoltage is generated between the first transformer coil 210 and the second transformer coil 220, and thus the voltage regulating transformer 200 is not damaged. The overvoltage protection device 10 provided by the embodiment can solve the problem that the damage of the on-load tap-changer in the conventional scheme is easy to cause the damage of the voltage regulating transformer.
In one embodiment of the present application, one end of the protection coil 100 is electrically connected to a third tap 212, and the other end is connected to a fourth tap 222, wherein the first transformer coil 210 comprises a first tap 211, a third tap 212 and a fifth tap 213, and a pressure difference between the third tap 212 and the first tap 211 is equal to a pressure difference between the fifth tap 213 and the third tap 212;
the second transformer winding 220 includes a second tap 221, a fourth tap 222 and a sixth tap 223, and a pressure difference between the fourth tap 222 and the second tap 221 is equal to a pressure difference between the sixth tap 223 and the fourth tap 222.
In one embodiment of the present application, the value of k is 1, and the rated voltage of the protection coil 100 is (U)1-U2). Setting a rated voltage of the protection coil to (U)1-U2) The volume allowed by the protective coil is minimal and the overvoltage protection is most sensitive.
In one embodiment of the present application, the protective coil 100 is a closed-loop iron core coil. The specification of the closed-loop iron core coil can be selected according to actual needs, as long as overvoltage protection of the transformer can be realized.
Referring to fig. 5, in an embodiment of the present application, an alarm device 20 is further electrically connected to the first transformer winding 210 and the second transformer winding 220, and the alarm device 20 is configured to indicate whether a voltage difference between the first transformer winding 210 and the second transformer winding 220 exceeds a set voltage difference range. The set voltage difference range is smaller than the critical voltage value which can cause the damage of the transformer. The alarm device 20 may include a voltage detector for detecting the magnitude of the voltage value, or a digital processing chip connected to the voltage detector through a signal, which may be specifically selected according to actual needs, and the present application is not limited thereto. In one embodiment, the alarm device 20 includes an audible alarm and an optical alarm. In one embodiment of the present application, the first transformer coil 210 and the second transformer coil 220 are further electrically connected with a power-off protection device 30. The power-off protection device 30 is used for preventing the overvoltage damage of the voltage regulating transformer 200 and improving the use reliability of the overvoltage protection device 10.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of protecting a regulating transformer, the method comprising:
arranging a protective coil between a regulating transformer and an on-load tap-changer, wherein the regulating transformer comprises a first transformer coil and a second transformer coil which are separated;
setting the rated voltage of the protection coil to a preset range, and setting the rated current of the protection coil to a preset value;
one end of the protection coil is connected with the first transformer coil, and the other end of the protection coil is connected with the second transformer coil.
2. The method of claim 1, wherein the setting the rated voltage of the protection coil to a preset range and the setting the rated current of the protection coil to a preset value comprises:
setting a rated voltage of the protection coil equal to k (U)1-U2) Wherein said U is1For the maximum up-regulation voltage of the regulating transformer, U2The minimum down-regulation voltage of the voltage regulating transformer is obtained, wherein k is a reliable coefficient and the value range is 1 to 2;
setting a rated current of the protection coil equal to rated currents of the first transformer coil and the second transformer coil.
3. The method of claim 2, wherein K has a value of 1, and wherein the rated voltage of the protective coil is set to be equal to K (U)1-U2) The method comprises the following steps:
setting a rated voltage of the protection coil equal to (U)1-U2) Wherein said U is1For the maximum up-regulation voltage of the regulating transformer, U2And regulating the minimum voltage of the regulating transformer.
4. The method of claim 1, wherein the protective coil is connected at one end to a first transformer coil and at another end to a second transformer coil, comprising:
one end of the protection coil is connected with a third tap, wherein the first transformer coil comprises a first tap, a third tap and a fifth tap, and the differential pressure between the third tap and the first tap is equal to the differential pressure between the fifth tap and the third tap;
the other end of the protection coil is connected with a fourth tap, wherein the second transformer coil comprises a second tap, a fourth tap and a sixth tap, and the pressure difference between the fourth tap and the second tap is equal to the pressure difference between the sixth tap and the fourth tap.
5. An overvoltage protection device based on the method of any one of claims 1 to 4, comprising:
a protective coil (100) electrically connected between a first transformer coil (210) and a second transformer coil (220), wherein the first transformer coil (210) and the second transformer coil (220) are disposed in the voltage regulating transformer (200),
the rated voltage of the protection coil (100) is k (U)1-U2) Said U1For maximum up-regulation of the voltage of the regulating transformer, U2The minimum down-regulation voltage of the voltage regulating transformer is obtained, k is a reliable coefficient, and the value range of k is 1-2;
an on-load tap changer (300) electrically connected between the first transformer coil (210) and the second transformer coil (220).
6. The overvoltage protection device according to claim 5, wherein the protection coil (100) is electrically connected at one end to a third tap (212) and at the other end to a fourth tap (222), wherein the first transformer coil (210) comprises a first tap (211), a third tap (212) and a fifth tap (213), and wherein the pressure difference between the third tap (212) and the first tap (211) is equal to the pressure difference between the fifth tap (213) and the third tap (212);
the second transformer coil (220) comprises a second tap (221), a fourth tap (222) and a sixth tap (223), the differential pressure of the fourth tap (222) and the second tap (221) being equal to the differential pressure of the sixth tap (223) and the fourth tap (222).
7. The overvoltage protection device according to claim 5, wherein k has a value of 1 and the protective coil (100) has a nominal voltage of (U1-U2).
8. Overvoltage protection device according to claim 5, characterized in that the protective coil (100) is a closed-loop iron core coil.
9. The overvoltage protection device according to claim 5, wherein the first transformer winding (210) and the second transformer winding (220) are further electrically connected with an alarm device (20), and the alarm device (20) is used for prompting whether a voltage difference between the first transformer winding (210) or the second transformer winding (220) exceeds a set voltage difference range.
10. Overvoltage protection device according to claim 9, characterized in that the first transformer coil (210) and the second transformer coil (220) are also electrically connected with a power-off protection device (30).
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| CN201910469276.7A CN110137909B (en) | 2019-05-31 | 2019-05-31 | Method for protecting a step-up transformer and overvoltage protection device |
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| CN201910469276.7A CN110137909B (en) | 2019-05-31 | 2019-05-31 | Method for protecting a step-up transformer and overvoltage protection device |
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