CN101075498B - Method and device for inhibiting transformer no-load switch-on surge - Google Patents
Method and device for inhibiting transformer no-load switch-on surge Download PDFInfo
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- CN101075498B CN101075498B CN2007100347233A CN200710034723A CN101075498B CN 101075498 B CN101075498 B CN 101075498B CN 2007100347233 A CN2007100347233 A CN 2007100347233A CN 200710034723 A CN200710034723 A CN 200710034723A CN 101075498 B CN101075498 B CN 101075498B
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Abstract
The invention relates to a device and a method for inhibiting inrush current upon switching on an idling transformer. The device includes more than one thyristor set linked between an AC power switch and the transformer, each phrase of the AC current is linked to at least one thyristor set; a side contactor parallely linked to the thyristor sets; a resistance-capacitance circuit parallely linked to two ends of a thyristor power module which forms the thyristor set. A front end voltage transformer in the system tests the power voltage; a current transformer tests the phase current of the transformer; a back end voltage transformer tests transformer voltage whose signal output terminals are respectively linked to the corresponding input terminals of a control unit. The control unit firstly calculates the size and phase of the pre-magnetizing flux linkage in the transformer, and calculates the link time for the premier winding sets to determine the connecting time for the thyristor set, as well as the link time for other winding sets, finally short-circuits the thyristor through the side switch sets. The invention can inhibit the excitation inrush current upon switching on the idling transformer to a great extent.
Description
Technical field
The present invention relates to the device of the transformer excitation flow that produces when suppressing the no-load transformer input in the power supply and distribution of electric power system, particularly a kind of apparatus and method that suppress transformer no-load switchon surge.
Background technology
The excessive magnetizing inrush current that produces during power supply and distribution of electric power system transformer idle-loaded switching-on usually causes problems such as microcomputer protecting device misoperation, the increase of winding mechanical stress and quality of power supply variation.At present, for this situation, all be in the prime microcomputer protecting device, to change the secondary harmonic brake coefficient to avoid no-load switchon surge basically, thereby prevent the protective device misoperation.But, when no-load transformer closes a floodgate, because the uncertainty of remanent magnetism, the randomness of closing moment, the variation of adding modern transformer magnetic characteristic causes when shoving reasons such as second harmonic content is low, make adjusting of second harmonic coefficient had sizable difficulty, often need test repeatedly and move for a long time could obtain certain empirical value as setting value, therefore, the effect of application is not fine.
Summary of the invention
Can not solve transformer no-load switchon surge efficiently at the method that extensively adopts at present and cause problems such as Microcomputer Protection misoperation; transformer no-load switchon surge be eliminated and be suppressed to patent of the present invention will as the starting point; a kind of apparatus and method that suppress transformer no-load switchon surge are provided, thereby have effectively solved the problems such as Microcomputer Protection misoperation that cause owing to magnetizing inrush current is excessive in the power supply and distribution of electric power system.
The technical solution adopted for the present invention to solve the technical problems is: with thyristor or thyristor valve group as switching device, when dropping into, no-load transformer carries out the phase-splitting switching, before the switching device triggering and conducting, before promptly closing a floodgate, the resistance-capacitance circuit by the parallel connection of thyristor two ends is coupled to that magnetic linkage that the voltage on the transformer sets up weakens or the influence of eliminating transformer remanent magnetism.
A kind of device that suppresses transformer no-load switchon surge, it comprises the switching device group 4 that is made of an above switching device, this switching device group 4 is connected between ac power switch and the transformer, and every cross streams electricity is at least to having a switching device and the resistance-capacitance circuit in parallel with switching device;
A bypass contactor 5, this bypass contactor 5 is connected in parallel with described switching device group 4,
A control unit 9, the control trigger impulse output of this control unit 9 links to each other with the control end of described switching device group 4;
Also comprise the front end front end voltage transformer 2 that detects supply voltage respectively, the current transformer 3 that detects the transformer phase current, detect the terminal voltage instrument transformer 7 of transformer voltage, the signal output part of described front end voltage transformer 2, current transformer 3 and terminal voltage instrument transformer 7 links to each other with the corresponding input of described control unit 9 respectively.
A kind of be used in have control unit and switching device group, the method for the inhibition transformer no-load switchon surge on the device of the bypass contactor in parallel with the switching device group, it is characterized in that it may further comprise the steps:
The first step, closing a floodgate at ac power switch powers on and after the pre-magnetizing magnetic linkage is set up in transformer inside, detects by resistance-capacitance circuit and is coupled to voltage swing and phase place on the Transformer Winding, obtains pre-magnetizing magnetic linkage size and phase place that this voltage is set up;
Second step, select to close phase winding headed by any phase winding, the size that obtains this phase pre-magnetizing magnetic linkage according to the above-mentioned first step directly is added on the transformer in this magnetic linkage size and phase place with foundation with phase place and rated voltage, the principle calculating head that equates according to magnetic linkage instantaneous value before and after closing a floodgate closes phase winding incision electrical network constantly, and promptly relevant phase thyristor triggering and conducting constantly;
The 3rd step, calculate first size and phase place of closing other phase magnetic linkage of back that closes a floodgate mutually, corresponding magnetic linkage size and the phase place mutually that directly is added on the transformer to be set up according to the size of this magnetic linkage and phase place and rated voltage, calculate other phase winding incision electrical networks constantly according to the principle that magnetic linkage instantaneous value before and after closing a floodgate equates, promptly relevant phase thyristor triggering and conducting constantly;
The 4th step is after each winding of transformer all drops into electrical network, with bypass contactor normally opened contact closes bypass switch combination of devices brake gear.
The magnetizing inrush current that the present invention produced in the time of can suppressing no-load transformer to a great extent and close a floodgate, thus the Microcomputer Protection misoperation that causes owing to magnetizing inrush current is excessive effectively prevented, can be widely used in electric power system confession distribution field.
Description of drawings
Fig. 1 is a circuit structure theory diagram of the present invention;
Fig. 2 is the circuit theory diagrams of embodiment;
Fig. 3 is testing process figure.
Among the figure: 1. three-phase alternating current source switch, 2. front end voltage transformer, 3. current transformer, 4. switching device, 5. bypass contactor, 6. lightning arrester, 7. terminal voltage instrument transformer, 8. transformer, 9. control unit
Embodiment
As shown in Figure 1 and Figure 2, a kind of device that suppresses transformer no-load switchon surge, at three-phase ac transformer, it comprises the switching device group 4 that is made of an above switching device, this switching device group 4 is connected between ac power switch 1 and the transformer 8, and every cross streams electricity is at least to having a switching device and the resistance-capacitance circuit in parallel with switching device;
A three-phase bypass contactor 5, this bypass contactor 5 is connected in parallel with described switching device group 4,
A control unit 9, the control trigger impulse output of this control unit 9 links to each other with the control end of described switching device group 4;
Also comprise the front end front end voltage transformer 2 that detects supply voltage respectively, the current transformer 3 that detects the transformer phase current, detect the terminal voltage instrument transformer 7 of transformer voltage, the signal output part of described front end voltage transformer 2, current transformer 3 and terminal voltage instrument transformer 7 links to each other with the corresponding input of described control unit 9 respectively.
The switching device of switching device group 4 is a thyristor groups, and each thyristor groups is made of a plurality of thyristors.The thyristor groups of switching device group 4 comprises a plurality of power models, and each power model is that two thyristor inverse parallels constitute, and adopts the final phase thyristor valve group (below be referred to as thyristor) that constitutes that is connected in series between the module.Thyristor is connected between transformer and the prime switch cubicle.The control end of switching device group 4 links to each other with the control trigger impulse output of control unit 9 by optical fiber 10.Be connected with lightning arrester 6 between bypass contactor 5 and the ground.
The operation principle of package unit is: after the prime switch cubicle powers on, before the thyristor triggering and conducting, voltage has been coupled to every phase winding of transformer by the resistance-capacitance circuit at every phase thyristor two ends, resistance-capacitance circuit is connected in parallel on the two ends of thyristor groups, and every pair of anti-parallel thyristor (power model) all has the RC circuit in parallel with it.Because this moment, the voltage on the transformer was come by resistance-capacitance coupling, therefore can not produce and shove, the voltage that is coupled on the transformer can be set up the pre-magnetizing magnetic linkage on transformer, thus weaken greatly and substitute power on before remanent magnetism in the transformer.The size of the magnetic linkage that the pre-magnetizing magnetic linkage is produced in transformer with respect to rated voltage and phase place can be coupled to voltage swing on the transformer and phase place and transformer rated voltage by resistance capaciting absorpting circuit and obtain, and here pre-magnetizing magnetic linkage note are done
Obtain
Relative size and phase place after, the magnetic linkage that directly is added on the transformer to be set up with line voltage
Compare, close the phase winding input constantly with head.If close phase winding headed by the A phase winding, then A phase winding input is chosen in two magnetic linkage curve intersection places constantly, in the relevant phase thyristor conducting of this time trigger, make transformer A phase winding drop into electrical network, after the A phase winding drops into, will in B, C phase winding, induce the magnetic linkage of a certain size and phase place, B, the input of C phase winding is according to dropping into identical principle with the A phase winding, i.e. magnetic linkage curve and drop into afterwards that the conducting of the relevant phase thyristor of magnetic linkage curve intersection location triggered gets final product in the winding in the winding before input.Three-phase all drops into the back and every some cycles thyristor is passed through the contactor bypass, and after this transformer is directly hung operation of power networks.
Whole making process comprises several links:
1. power on, set up the pre-magnetizing magnetic linkage.
In Fig. 2, the former limit of transformer is a delta connection, after the three-phase alternating-current supply switch cubicle closes a floodgate, line voltage will be added on thyristor and the Transformer Winding, because this moment, thyristor did not have triggering and conducting, therefore in fact line voltage acts on the resistance-capacitance circuit and Transformer Winding of thyristor two ends parallel connection, voltage on the Transformer Winding is come by the resistance-capacitance circuit coupling, this voltage will be set up corresponding magnetic linkage in transformer inside, be called pre-magnetizing magnetic field, this magnetic linkage can weaken greatly or offset transformer remanent magnetism, makes can not consider the immesurable factor of remanent magnetism in the making process.
2. detect by resistance-capacitance circuit and be coupled to voltage swing and phase place on the Transformer Winding, obtain pre-magnetizing magnetic linkage size and phase place that this voltage is set up.
With transformer A phase winding is example, can record the size of this voltage by the voltage transformer of transformer side, with the grid line voltage U
UvPositive going zeror crossing point then can obtain the phase place of this voltage as the origin of coordinates, and this voltage note is done
And have:
θ is
The phase angle of leading line voltage.Select rated voltage as base value, will
Standardization is:
Because the size of voltage and magnetic linkage is directly proportional, so the peaked perunit value of the magnetic linkage in voltage and it self magnetic field of setting up equates that the leading magnetic linkage of voltage is 90 ° on phase place, therefore
The magnetic linkage perunit value in the magnetic field of setting up is:
3. select to close phase winding headed by any phase winding, directly be added in magnetic linkage size and the phase place of setting up mutually at this on the transformer according to 2 sizes that obtain this phase pre-magnetizing magnetic linkage with phase place and rated voltage, the principle calculating head that equates according to magnetic linkage instantaneous value before and after closing a floodgate closes phase winding incision electrical network constantly, and promptly relevant phase thyristor triggering and conducting constantly.
Select to close phase winding, rated voltage U headed by the A phase winding
UvCan be expressed as behind the magnetic linkage standardization of in the A phase winding, setting up: 1 * sin (ω t-90 °).The moment of A phase winding incision electrical network can be passed through equation
Come to determine, for the transformer of delta connection, in the A phase winding input that calculates constantly, with U, V two-phase thyristor triggering and conducting and keep conducting and get final product
4. calculate first size and phase place of closing other phase magnetic linkages of back that close a floodgate mutually, corresponding magnetic linkage size and the phase place mutually that directly is added on the transformer to be set up according to the size of this magnetic linkage and phase place and rated voltage, calculate other phase winding incision electrical networks constantly according to the principle that magnetic linkage instantaneous value before and after closing a floodgate equates, promptly relevant phase thyristor triggering and conducting constantly.
To former limit is the transformer of delta connection, after the A phase winding drops into electrical network, B, the voltage of C phase winding is half of A phase voltage, phase place is opposite, therefore corresponding B, magnetic linkage size in the C phase winding is half of A phase winding, phase place is opposite, can be expressed as :-0.5 * sin (ω t-90 °), for B, the C phase winding, can be expressed as respectively behind the magnetic linkage standardization that rated voltage is set up: 1 * sin (ω t-120 °-90 °), 1 * sin (ω t-240 °-90 °), B, C phase winding input can be determined by equation 0.5 * sin (ω t-90 °)=1 * sin (ω t-120 °-90 °) constantly, separate this equation and can get B, C phase winding input is k*180 ° constantly, promptly, select line voltage U throwing after the A phase winding drops into electrical network
UvThe zero crossing place trigger the conducting of W phase thyristor, just can be with B, C phase winding input electrical network.
5. after transformer three phase windings all dropped into electrical network, with the closed bypass thyristor valve of bypass contactor normally opened contact closing device, transformer dropped into operation of power networks fully.
Claims (7)
1. device that suppresses transformer no-load switchon surge is characterized in that it comprises:
The thyristor groups (4) that constitutes by one or more thyristor power models, this thyristor groups (4) is connected between ac power switch and the transformer, every cross streams electricity is all to there being a cover thyristor groups, the thyristor power model that constitutes described thyristor groups (4) is that two thyristor inverse parallels constitute, adopt between the thyristor power model to be connected in series, and each thyristor power model two ends resistance-capacitance circuit all in parallel;
A bypass contactor (5), this bypass contactor (5) is connected in parallel with described thyristor groups (4);
A control unit (9), the control trigger impulse output of this control unit (9) links to each other with the control end of described thyristor groups (4);
Also comprise the front end voltage transformer (2) that detects supply voltage respectively, the current transformer (3) that detects the transformer phase current and the terminal voltage instrument transformer (7) that detects transformer voltage, the signal output part of described front end voltage transformer (2), current transformer (3) and terminal voltage instrument transformer (7) links to each other with the corresponding input of described control unit (9) respectively.
2. a kind of device that suppresses transformer no-load switchon surge as claimed in claim 1 is characterized in that the control end of described thyristor groups (4) links to each other with the control trigger impulse output of control unit (9) by optical fiber (10).
3. a kind of device that suppresses transformer no-load switchon surge as claimed in claim 1 is characterized in that being connected with between described bypass contactor (5) and the ground lightning arrester (6).
4. the device of an application inhibition transformer no-load switchon surge as claimed in claim 1 suppresses the method for transformer no-load switchon surge, it is characterized in that it may further comprise the steps:
The first step, close ac power switch, the resistance-capacitance circuit that makes Transformer Winding pass through the two ends parallel connection of thyristor power model links to each other with power supply, thereby set up the pre-magnetizing magnetic linkage in transformer inside, after the pre-magnetizing magnetic linkage is set up in transformer inside, the resistance-capacitance circuit of detection by the two ends parallel connection of thyristor power model is coupled to voltage swing and the phase place on the Transformer Winding, obtains pre-magnetizing magnetic linkage size and phase place that this voltage is set up;
Second step, select to close phase winding headed by any phase winding, the size that obtains this phase pre-magnetizing magnetic linkage according to the above-mentioned first step directly is added in magnetic linkage size and the phase place of setting up mutually at this on the transformer with phase place and rated voltage, the principle calculating head that equates according to magnetic linkage instantaneous value before and after closing a floodgate closes phase winding incision electrical network constantly, and promptly relevant phase thyristor groups triggering and conducting constantly;
The 3rd step, calculate first size and phase place of closing other phase magnetic linkage of back that closes a floodgate mutually, corresponding magnetic linkage size and the phase place mutually that directly is added on the transformer to be set up according to the size of this magnetic linkage and phase place and rated voltage, calculate other phase winding incision electrical networks constantly according to the principle that magnetic linkage instantaneous value before and after closing a floodgate equates, promptly relevant phase thyristor groups triggering and conducting constantly;
The 4th step, after each winding of transformer all drops into electrical network,, thereby give transformer-supplied by bypass contactor with bypass contactor normally opened contact closure, finish whole closing operation.
5. a kind of method that suppresses transformer no-load switchon surge as claimed in claim 4 is characterized in that the method that obtains pre-magnetizing magnetic linkage size and phase place in the described first step is:
Ac power switch detects the voltage swing that is coupled on the transformer, with the grid line voltage U after closing a floodgate and powering on
UvPositive going zeror crossing point then can obtain the phase place that head closes phase voltage as the origin of coordinates, and this voltage note is done
And have:
U wherein
2mFor being coupled to maximum, the θ that transformer head closes the voltage of going up mutually be
The phase angle of leading line voltage;
Select rated voltage as base value, will
Standardization is:
Because the size of voltage and magnetic linkage is directly proportional, the peaked perunit value of the magnetic linkage in voltage and it self magnetic field of setting up equates that the leading magnetic linkage of voltage is 90 ° on phase place, therefore
The magnetic linkage perunit value in the magnetic field of setting up is:
6. a kind of method that suppresses transformer no-load switchon surge as claimed in claim 4 is characterized in that the first phase winding incision electrical network method constantly of closing of calculating is in described second step:
Select to close phase winding, the grid line voltage U headed by the A phase winding
UvCan be expressed as behind the magnetic linkage standardization of in the A phase winding, setting up: 1 * sin (ω t-90 °);
The moment of A phase winding incision electrical network can be passed through equation
Determine, wherein U
2mFor being coupled to maximum, the θ that transformer head closes the voltage of going up mutually be
The phase angle of leading line voltage; For the transformer of delta connection, in the A phase winding input that calculates constantly, will trigger and keep conducting with the corresponding U of A phase winding, V two-phase thyristor groups.
7. a kind of method that suppresses transformer no-load switchon surge as claimed in claim 4 is characterized in that the method for calculating other phase winding incisions electrical networks moment in described the 3rd step is:
B, C phase winding input determine according to-0.5 * sin (ω t-90 °)=1 * sin (ω t-120 °-90 °) number constantly, can obtain B, C phase winding input constantly pairing angle be k*180 °, wherein k is a natural number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100347233A CN101075498B (en) | 2007-04-13 | 2007-04-13 | Method and device for inhibiting transformer no-load switch-on surge |
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| CN2007100347233A CN101075498B (en) | 2007-04-13 | 2007-04-13 | Method and device for inhibiting transformer no-load switch-on surge |
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| CN101075498A CN101075498A (en) | 2007-11-21 |
| CN101075498B true CN101075498B (en) | 2011-05-25 |
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| CN2007100347233A Expired - Fee Related CN101075498B (en) | 2007-04-13 | 2007-04-13 | Method and device for inhibiting transformer no-load switch-on surge |
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Owner name: CSR ZHUZOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE Free format text: FORMER NAME: ZHUZHOU INST. OF POWER LOCOMOTIVE, CHINA NANCHE GROUP |
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| CP03 | Change of name, title or address |
Address after: 412000 Hunan Province, Zhuzhou Shifeng District Tian Xin North Gate Patentee after: CSR Zhuzou Electric Locomotive Research Institute Co., Ltd. Patentee after: State Engineering Research Centre of Zhuzhou Inversion Technology Address before: 412000, Zhuzhou City, Hunan province Tian heart North Gate Era Group Patentee before: Zhuzhou Inst. of Power Locomotive, China Nanche Group Patentee before: State Engineering Research Centre of Zhuzhou Inversion Technology |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110525 Termination date: 20200413 |