CN203206105U - Soft start device for unidirectional transformer - Google Patents
Soft start device for unidirectional transformer Download PDFInfo
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- CN203206105U CN203206105U CN 201320207232 CN201320207232U CN203206105U CN 203206105 U CN203206105 U CN 203206105U CN 201320207232 CN201320207232 CN 201320207232 CN 201320207232 U CN201320207232 U CN 201320207232U CN 203206105 U CN203206105 U CN 203206105U
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- delay relay
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Abstract
The utility model discloses a soft start device for a unidirectional transformer, which is composed of a time-delay relay and an impedance component, wherein the time-delay relay is connected in series between a power supply and the transformer, and the impedance component is connected with the time-delay relay in parallel. The soft start device can reduce impact current when the transformer is electrified.
Description
Technical field
The utility model relates to field transformer, relates 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 larger 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, the 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 large I reaches 80～100 times of stable state exciting curent, or 6～8 times of rated current.Shove and can not cause large 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 users in the impact.
The way that solves at present the impact of isolating transformer starting current has following three:
1, when necessary configuration isolation transformer, will change the conventional design of isolating transformer.Get the maximum magnetic induction of normal operation when for example, general linear transformer designs.Value is that (the Bs value of general iron core is 18000～20000Gs to 65%～75% saturation induction density Bs value, gets the Bm value during design and is 14000-15000Gs.If but design the time gets such as value≤0.5Bs value, then in no instance the starting current impact phenomenon can occur, but this will pay the cost of raising transformer cost 20%～30%, and volume is large, weight is high.
2, increase simply transformer input system power contact capacity.For example, the normal running current of system is 20A, considers that the inrush 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, the setting position of isolating transformer also is taken into account.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 the equipment such as ups power supply, AC voltage regulator.But impulsive disturbance always exists.Take the 5KW isolating transformer as example, 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 at access 230V power supply.
The utility model content
The utility model purpose is: for 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.
The technical solution of the utility model is: described unidirectional transformer soft starting device, it consists of 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.
The utility model has the advantages that: this unidirectional transformer soft starting device provided by the utility model 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 utility model is further described:
Fig. 1 is the structural representation of the utility model embodiment;
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 the utility model soft starting device;
Wherein: 1-impedance component, 2-time-delay relay, 3-transformer.
Embodiment
Embodiment:
As shown in Figure 1, this unidirectional transformer soft starting device that the present embodiment provides consists of 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 the present embodiment is described below: when transformer passed into 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 contacts are closed, and 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.
Can find out from Fig. 2 and Fig. 3, traditional unidirectional transformer is when starting, 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 utility model and characteristics, and its purpose is to allow people can understand content of the present utility model and implements according to this, can not limit protection range of the present utility model with this.All equivalent transformation or modifications of doing according to the Spirit Essence of the utility model main technical schemes all should be encompassed within the protection range of the present utility model.
Claims (3)
1. unidirectional transformer soft starting device is characterized in that: it consists of 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 |
|---|---|---|---|
| CN 201320207232 CN203206105U (en) | 2013-04-23 | 2013-04-23 | Soft start device for unidirectional transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320207232 CN203206105U (en) | 2013-04-23 | 2013-04-23 | Soft start device for unidirectional transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203206105U true CN203206105U (en) | 2013-09-18 |
Family
ID=49150165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320207232 Expired - Lifetime CN203206105U (en) | 2013-04-23 | 2013-04-23 | Soft start device for unidirectional transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203206105U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208911A (en) * | 2013-04-23 | 2013-07-17 | 苏州奥宝杰电机科技有限公司 | Soft starting device of unidirectional transformer |
-
2013
- 2013-04-23 CN CN 201320207232 patent/CN203206105U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208911A (en) * | 2013-04-23 | 2013-07-17 | 苏州奥宝杰电机科技有限公司 | Soft starting device of unidirectional transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130918 |
|
| CX01 | Expiry of patent term |