CN103208911A - Soft starting device of unidirectional transformer - Google Patents
Soft starting device of unidirectional transformer Download PDFInfo
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- CN103208911A CN103208911A CN2013101414705A CN201310141470A CN103208911A CN 103208911 A CN103208911 A CN 103208911A CN 2013101414705 A CN2013101414705 A CN 2013101414705A CN 201310141470 A CN201310141470 A CN 201310141470A CN 103208911 A CN103208911 A CN 103208911A
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- transformer
- starting device
- soft starting
- unidirectional
- current
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Abstract
The invention discloses a soft starting device of a unidirectional transformer. The soft starting device is formed by a delay relay connected between a power source and the input end of the transformer in series and an impedance element parallelly connected with the delay relay. The soft starting device can reduce the impact current generated during power-on of the transformer.
Description
Technical field
The present invention relates to field transformer, relate in particular to a kind of unidirectional transformer soft starting device.
Background technology
The transient current that transformer excitation flow produces in its winding when being the energising of transformer full voltage. when the flow direction that operating voltage produced when the residual flux before transformer drops in the iron core dropped into transformer is identical, its total magnetic flux is considerably beyond the saturation flux amount of iron core, therefore produce bigger shoving, wherein peak-peak can reach the transformer rated current 6-8 doubly. the phase angle of system voltage when magnetizing inrush current drops into transformer, factors such as the residual flux of transformer core and power-supply system impedance are relevant. voltage was through moment of zero crossing (this time magnetic flux be peak value) when peak inrush current appeared at the transformer input
Transformer exiting pour current can occur when idle-loaded switching-on.Its big I reaches 80～100 times of stable state exciting curent, or 6～8 times of rated current.Shove and can not cause big harm to transformer itself, but can cause electro-mechanical wave in some cases, as not taking corresponding measure, transformer overcurrent or protective relaying maloperation are done.Cause outage, other use the user in the influence.
The way that solves the impact of isolating transformer starting current at present has following three:
1, when must the configuration isolation transformer, will change the conventional design of isolating transformer.For example, get the maximum magnetic induction of operate as normal during the general linear design of transformer.Value is that (the Bs value of general iron core is 18 000～20 000Gs to 65%～75% saturation induction density Bs value, gets the Bm value during design and is 14000-15000Gs.If but design the time gets as value≤0.5Bs value, then in no instance the starting current impact phenomenon can take place, but this will pay the cost of raising transformer cost 20%～30%, and volume is big, the weight height.
2, increase transformer input system panel switches capacity simply.For example, the normal running current of system is 20A, considers that the startup impulse current of transformer may reach 8 times, i.e. 160A, then the panel switches dropout protection capacity of transformer front should 〉=150A.Consequently, the input distribution has just lost the overload of its back or the transient protective function of short circuit current, and can only protect with heat protection form, and from a security point of view, such design is irrational.
3, isolating transformer arranges the position also at the row of consideration.If the back of transformer configuration at equipment such as ups power supply, AC voltage regulator, when system starts, can be protected by the current-limiting function of equipment such as ups power supply, AC voltage regulator.But existence is always disturbed in impact.Be example with the 5KW isolating transformer, general input pickup resistance value 0.3-0.5 ohm is that its moment impact electric current (starting current) can reach 180A, can make the air conservation switch trip like this inserting the 230V power supply.
Summary of the invention
The present invention seeks to: at the problems referred to above, provide a kind of unidirectional transformer soft starting device, the impulse current when being intended to reduce the transformer energising.
Technical scheme of the present invention is: described unidirectional transformer soft starting device, it constitutes by being serially connected in time-delay relay between power supply and the transformer input and the impedance component in parallel with described time-delay relay.
As preferably, described impedance original paper is power resistor.
As preferably, described impedance component is inductance.
Advantage of the present invention is: this unidirectional transformer soft starting device provided by the present invention is simple in structure, with low cost, can effectively prevent the generation of heavy current impact phenomenon, and unidirectional transformer can normally be started and work.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is traditional unidirectional transformer winding testing current figure when starting;
Fig. 3 is the unidirectional transformer winding testing current figure when starting that has adopted soft starting device of the present invention;
Wherein: 1-impedance component, 2-time-delay relay, 3-transformer.
Embodiment
Embodiment:
As shown in Figure 1, this unidirectional transformer soft starting device that present embodiment provides constitutes by being serially connected in time-delay relay 2 between power supply and transformer 3 inputs and the impedance component 1 in parallel with described time-delay relay.
Described impedance original paper 1 can be power resistor, also can be other components and parts such as inductance.
Refer again to shown in Figure 1ly, existing operation principle with present embodiment is described below: when transformer fed voltage, time-delay relay 2 normally opened contacts were in open mode, and this moment, the inflow direction of electric current was: A-B-C-D-F-G-H.Because the existence of impedance component 1, the starting current of transformer will reduce (size of electric current is determined by the impedance magnitude of impedance component 1) greatly, thereby effectively prevented the generation of heavy current impact phenomenon.Switch on after 0～5 second, time-delay relay 2 normally opened contact closures, owing to the impedance of B-E-F branch road than B-C-D-F branch road is much smaller (impedance of B-E-F branch road is close to zero), the direction of electric current inflow transformer becomes: A-B-E-F-G-H.
As can be seen, traditional unidirectional transformer is when starting from Fig. 2 and Fig. 3, and maximum current is up to 108A, and after having adopted this unidirectional transformer soft starting device, maximum current is reduced to 52A, has reduced the starting current of (108-52)/108=52%.
Certainly, above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow people can understand content of the present invention and implements according to this, can not limit protection scope of the present invention with this.The all spiritual essence of main technical schemes is done according to the present invention equivalent transformation or modification all should be encompassed within protection scope of the present invention.
Claims (3)
1. unidirectional transformer soft starting device is characterized in that: it constitutes by being serially connected in time-delay relay (2) between power supply and transformer (3) input and the impedance component (1) in parallel with described time-delay relay (2).
2. unidirectional transformer soft starting device according to claim 1, it is characterized in that: described impedance original paper (1) is power resistor.
3. unidirectional transformer soft starting device according to claim 1, it is characterized in that: described impedance component (1) is inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101414705A CN103208911A (en) | 2013-04-23 | 2013-04-23 | Soft starting device of unidirectional transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101414705A CN103208911A (en) | 2013-04-23 | 2013-04-23 | Soft starting device of unidirectional transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103208911A true CN103208911A (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101414705A Pending CN103208911A (en) | 2013-04-23 | 2013-04-23 | Soft starting device of unidirectional transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103208911A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2817016Y (en) * | 2004-12-22 | 2006-09-13 | 刘江 | Soft-excitation transformer without excitation flow and without switch-on over-voltage |
| CN2907083Y (en) * | 2006-04-05 | 2007-05-30 | 北京中科信电子装备有限公司 | Soft starter for high power industrial frequency transformer |
| CN201766508U (en) * | 2010-09-21 | 2011-03-16 | 北京优科利尔能源设备有限公司 | Single-phase single-pole full-bridge isolated power factor correction converter |
| CN203206105U (en) * | 2013-04-23 | 2013-09-18 | 苏州奥宝杰电机科技有限公司 | Soft start device for unidirectional transformer |
-
2013
- 2013-04-23 CN CN2013101414705A patent/CN103208911A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2817016Y (en) * | 2004-12-22 | 2006-09-13 | 刘江 | Soft-excitation transformer without excitation flow and without switch-on over-voltage |
| CN2907083Y (en) * | 2006-04-05 | 2007-05-30 | 北京中科信电子装备有限公司 | Soft starter for high power industrial frequency transformer |
| CN201766508U (en) * | 2010-09-21 | 2011-03-16 | 北京优科利尔能源设备有限公司 | Single-phase single-pole full-bridge isolated power factor correction converter |
| CN203206105U (en) * | 2013-04-23 | 2013-09-18 | 苏州奥宝杰电机科技有限公司 | Soft start device for unidirectional transformer |
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Application publication date: 20130717 |