CN103532456A - Method for starting large transformer by utilizing solid state thyristor soft starter - Google Patents
Method for starting large transformer by utilizing solid state thyristor soft starter Download PDFInfo
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- CN103532456A CN103532456A CN201310491731.6A CN201310491731A CN103532456A CN 103532456 A CN103532456 A CN 103532456A CN 201310491731 A CN201310491731 A CN 201310491731A CN 103532456 A CN103532456 A CN 103532456A
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- transformer
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- state thyristor
- thyristor soft
- circuit breaker
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Abstract
The invention discloses a method for starting a large transformer by utilizing a solid state thyristor soft starter. The input end of the transformer is connected with a distribution power supply by two lines, wherein one of the two lines serves as a starting loop formed in a manner that a breaker I and the solid state thyristor soft starter are connected in series in sequence between the distribution power supply and the transformer; the other line serves as a normal power supply loop of the transformer, which is formed in a manner that a breaker II is connected between the distribution power supply and the transformer. By judging whether the opening and closing status signal of the incoming line breaker I serves as a starting condition or not, when the breaker I is closed, the solid state thyristor soft starter is started, and linear boosting is performed by adopting a voltage harmonic control mode; after the solid state thyristor soft starter is started, a closing signal is sent to the power supply loop by the solid state thyristor soft starter, the breaker II is closed, and the distribution power supply and the transformer are connected, and a starting signal is canceled by the solid state thyristor soft starter to disconnect the distribution power supply and the transformer. According to the method disclosed by the invention, output voltage is controlled by utilizing the solid state thyristor soft starter, and therefore, the problem that a switch is tripped due to protective actions, such as a differential action and the like when the transformer is started and closed.
Description
Technical field
The present invention relates to the starting method of transformer, relate in particular to and a kind ofly by voltage ramp, slowly promote transformer primary polygonal voltage, and suppress the method for utilizing solid-state thyristor soft starter starting large transformer of magnetizing inrush current in high-power transformer starting process.Belong to electric power project engineering field.
Background technology
At present, the starting of high-power transformer generally adopts the start mode that drops into again electrical network after idle-loaded switching-on.Under normal circumstances, because high-power transformer operates in the linearity range region of magnetization curve, the relative permeability of iron core is larger, the excitation impedance of Transformer Winding is also larger, thereby, exciting current is less, therefore, when directly to high-power transformer idle-loaded switching-on, high-power transformer is in the process of boosting, because magnetic flux can not suddenly change, in magnetic flux, there is acyclic transient state component, make transformer core saturated together with iron core remanent magnetism, now, relative permeability is close to 1, the impedance of Coefficients of Large Power Transformer Winding reduces, the corresponding electric current that occurs that numerical value is larger, its numerical value may reach 6～8 times of transformer rated current, therefore, tend to cause the misoperation of transformer differential protection and the trip problem causing thus.
In Practical Project, in order to reduce the impact of magnetizing inrush current on electric power system, also have and take to limit amplitude and the transient process of shoving in closing circuit series resistance, reactance, but, the method has not only increased the complexity of operation, and its inhibition is subject to the impact of series resistance, reactance value size larger.
Along with the development of switching technique, also occurred phase selection divide-shut brake technology, but the circuit breaker configuring due to most large-scale power transformers is three-phase ganged formula, and three-phase ganged formula circuit breaker obviously cannot be realized inhibition when three-phase is shoved; Simultaneously, remanent magnetism in high-power transformer is also difficult to measure, in order accurately to control the size of remanent magnetism and magnetic bias, its basic prerequisite is: the divide-shut brake opportunity that can accurately control circuit breaker, and, the impact that the time delay of the dispersiveness of the branch wire time of circuit breaker, main contact and auxiliary contact brings all will take into full account, so the problem that the method exists is in actual applications still many.Therefore, reduce the starting current of high-power transformer, guarantee that the safe and reliable starting of high-power transformer is very necessary.
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming that prior art exists, and provide a kind of method of utilizing solid-state thyristor soft starter starting large transformer, it utilizes solid-state thyristor soft starter to control output voltage, by the voltage ramp of soft starter, slowly promote the original edge voltage of transformer, linearity by original edge voltage raises as transformer magnetizes, and sets up work magnetic field; Solved transformer starting while closing a floodgate, switch is because the differential problem that waits protection to move to cause tripping operation; And, reduced the harmful effect that electric current, voltge surge bring transformer service life and maintenance, extend the normal working hours of transformer; For the magnetizing inrush current of administering in large transformer starting process has proposed an effective way.
The object of the invention is to be realized by following technical scheme:
A kind of method of utilizing solid-state thyristor soft starter starting large transformer, be provided with: transformer, it is characterized in that: the input of this transformer is connected with power distribution by two route roads, ，Yi road wherein: be in series with successively a circuit breaker I and solid-state thyristor soft initiator as starting loop between power distribution and transformer; Another road: be connected a circuit breaker II as transformer normal power supply loop between power distribution and transformer; The folding condition signal of solid-state thyristor soft initiator by judgement lead-in circuit breaker I be as the condition starting, when circuit breaker I is closed a floodgate, and solid-state thyristor soft initiator startup, and adopt voltage ramp control mode to carry out linearity to boost; After startup completes, solid-state thyristor soft initiator provides current supply circuit switching signal, circuit breaker II obtains after normal inlet wire reclosing command, circuit breaker II is closed a floodgate, power distribution is connected with transformer, meanwhile, solid-state thyristor soft initiator is cancelled enabling signal and is disconnected and being connected of transformer, and transformer has only been connected whole start-up course with power distribution by circuit breaker II.
The described method of utilizing solid-state thyristor soft starter starting large transformer, is characterized in that: adopt following setting up procedure:
The first step: by the control selection mode on solid-state thyristor soft initiator, put into dish cabinet state of a control, then, the combined floodgate of the circuit breaker I of control transformer current supply circuit;
Second step: the lead-in circuit breaker II of solid-state thyristor soft initiator is closed a floodgate;
The 3rd step: press the start button on solid-state thyristor soft initiator, softly open work, after having started, provided the reclosing command of circuit breaker I by solid-state thyristor soft initiator 3, circuit breaker I is closed a floodgate; Solid-state thyristor soft initiator stops automatically, returns to standby condition;
The 4th step: by after the lead-in circuit breaker II separating brake of solid-state thyristor soft initiator, start and finish.
Beneficial effect of the present invention: the present invention is owing to adopting technique scheme, it utilizes solid-state thyristor soft starter to control output voltage, by the voltage ramp of soft starter, slowly promote the original edge voltage of transformer, linearity by original edge voltage raises as transformer magnetizes, and sets up work magnetic field; Solved transformer starting while closing a floodgate, switch is because differentially wait protection to move the problem of cause tripping operation; And, reduced the harmful effect that electric current, voltge surge bring transformer service life and maintenance, extend the normal working hours of transformer; For the magnetizing inrush current of administering in large transformer starting process has proposed an effective way., in starting process, can start based on zero-pressure, so almost do not have impulse current to occur meanwhile; Have principle simple, calculate quick feature.
Accompanying drawing explanation:
Fig. 1 is electrical schematic diagram of the present invention.
Major label description in figure:
1. circuit breaker, 2. circuit breaker, 3. solid-state thyristor soft initiator, 4. transformer, 5. power distribution.
Embodiment
As shown in Figure 1, the present invention is provided with: transformer 4, and the input of transformer 4 is connected with power distribution 5 by two route roads, wherein, one tunnel for starting loop, that is: is in series with successively a circuit breaker 1 and solid-state thyristor soft initiator 3 between power distribution 5 and transformer 4; Another road is transformer 4 normal power supply loops: between power distribution 5 and transformer 4, be connected a circuit breaker 2.The folding condition signal of solid-state thyristor soft initiator 3 by judgement lead-in circuit breaker 1 is as the condition starting, and when circuit breaker 1 closes a floodgate, solid-state thyristor soft initiator 3 starts, and adopts voltage ramp control mode to carry out linearity to boost; After startup completes, solid-state thyristor soft initiator 3 provides current supply circuit switching signal, circuit breaker 2 obtains after normal inlet wire reclosing command, circuit breaker 2 closes a floodgate, power distribution 5 is connected with transformer 4, and meanwhile, solid-state thyristor soft initiator 3 is cancelled enabling signal and is disconnected and being connected of transformer 4, transformer 4 is only connected with power distribution 5 by circuit breaker 2, and whole start-up course completes.
The present invention is the control principle to output voltage according to solid-state thyristor, utilize the CPU in solid-state thyristor soft initiator to carry out phase angle triggering control to solid-state thyristor, to reduce, be added in the voltage on transformer, then, the voltage and current that raising is slowly added on transformer magnetizes transformer, until transformer reaches rated voltage.This start mode can reduce the starting current of transformer, avoids starting overcurrent tripping, also can reduce the impact to equipment such as transformer, generating sets.
The present invention adopts following set up procedure:
The first step: by the control selection mode on solid-state thyristor soft initiator 3, put into dish cabinet state of a control, then, the combined floodgate of the circuit breaker 1 of control transformer current supply circuit;
The present embodiment: the model of solid-state thyristor soft initiator 3 is: the serial solid-state thyristor soft initiator of motor holder Buddhist nun (MOTORTRONICS-MVC3).
Second step: the lead-in circuit breaker of solid-state thyristor soft initiator 32 is closed a floodgate;
The 3rd step: press the start button on solid-state thyristor soft initiator 3, softly open work, after having started, provided the reclosing command of circuit breaker 1 by solid-state thyristor soft initiator 3, circuit breaker 1 closes a floodgate; Solid-state thyristor soft initiator 3 stops automatically, returns to standby condition;
The 4th step: by after the lead-in circuit breaker of solid-state thyristor soft initiator 32 separating brakes, start and finish.
Above-mentioned circuit breaker, solid-state thyristor soft initiator, be prior art.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (2)
1. a method of utilizing solid-state thyristor soft starter starting large transformer, be provided with: transformer, it is characterized in that: the input of this transformer is connected with power distribution by two route roads, ，Yi road wherein: be in series with successively a circuit breaker I and solid-state thyristor soft initiator as starting loop between power distribution and transformer; Another road: be connected a circuit breaker II as transformer normal power supply loop between power distribution and transformer; The folding condition signal of solid-state thyristor soft initiator by judgement lead-in circuit breaker I be as the condition starting, when circuit breaker I is closed a floodgate, and solid-state thyristor soft initiator startup, and adopt voltage ramp control mode to carry out linearity to boost; After startup completes, solid-state thyristor soft initiator provides current supply circuit switching signal, circuit breaker II obtains after normal inlet wire reclosing command, circuit breaker II is closed a floodgate, power distribution is connected with transformer, meanwhile, solid-state thyristor soft initiator is cancelled enabling signal and is disconnected and being connected of transformer, and transformer has only been connected whole start-up course with power distribution by circuit breaker II.
2. the method for utilizing solid-state thyristor soft starter starting large transformer according to claim 1, is characterized in that: adopt following setting up procedure:
The first step: by the control selection mode on solid-state thyristor soft initiator, put into dish cabinet state of a control, then, the combined floodgate of the circuit breaker I of control transformer current supply circuit;
Second step: the lead-in circuit breaker II of solid-state thyristor soft initiator is closed a floodgate;
The 3rd step: press the start button on solid-state thyristor soft initiator, softly open work, after having started, provided the reclosing command of circuit breaker I by solid-state thyristor soft initiator 3, circuit breaker I is closed a floodgate; Solid-state thyristor soft initiator stops automatically, returns to standby condition;
The 4th step: by after the lead-in circuit breaker II separating brake of solid-state thyristor soft initiator, start and finish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310491731.6A CN103532456A (en) | 2013-10-18 | 2013-10-18 | Method for starting large transformer by utilizing solid state thyristor soft starter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310491731.6A CN103532456A (en) | 2013-10-18 | 2013-10-18 | Method for starting large transformer by utilizing solid state thyristor soft starter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040124814A1 (en) * | 2002-12-25 | 2004-07-01 | Mitsubishi Denki Kabushiki Kaisha | Transformer inrush current elimination system |
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| CN101609983A (en) * | 2008-06-20 | 2009-12-23 | 株式会社东芝 | The excitation inrush current restraining device and the control method thereof of transformer |
| CN102790405A (en) * | 2012-07-30 | 2012-11-21 | 能科节能技术股份有限公司 | Device and method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN103078517A (en) * | 2012-12-27 | 2013-05-01 | 保定天威集团有限公司 | Generation device and method for magnetizing inrush current of three-phase transformer |
-
2013
- 2013-10-18 CN CN201310491731.6A patent/CN103532456A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040124814A1 (en) * | 2002-12-25 | 2004-07-01 | Mitsubishi Denki Kabushiki Kaisha | Transformer inrush current elimination system |
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| CN101609983A (en) * | 2008-06-20 | 2009-12-23 | 株式会社东芝 | The excitation inrush current restraining device and the control method thereof of transformer |
| CN102790405A (en) * | 2012-07-30 | 2012-11-21 | 能科节能技术股份有限公司 | Device and method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN103078517A (en) * | 2012-12-27 | 2013-05-01 | 保定天威集团有限公司 | Generation device and method for magnetizing inrush current of three-phase transformer |
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Application publication date: 20140122 |