CN203278635U - Precharging device having pre-magnetizing function - Google Patents
Precharging device having pre-magnetizing function Download PDFInfo
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- CN203278635U CN203278635U CN 201320260554 CN201320260554U CN203278635U CN 203278635 U CN203278635 U CN 203278635U CN 201320260554 CN201320260554 CN 201320260554 CN 201320260554 U CN201320260554 U CN 201320260554U CN 203278635 U CN203278635 U CN 203278635U
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Abstract
Disclosed in the utility model is a precharging device having a pre-magnetizing function. The precharging device comprises a primary loop and a secondary loop; the primary loop consists of a rectifier transformer, a twelve-pulse rectifier, and a plurality of capacitors; and the secondary loop includes a contactor, a voltage regulation reactor, and a boosting transformer. The primary loop is connected with a power grid by a circuit breaker; and the secondary loop is connected between the main loop and the power grid. According to the precharging device provided by the utility model, on the basis of utilization of a simple electric loop structure, a pre-magnetizing function of the rectifier transformer in a rectification front end of a frequency converter and a pre-charging function of the capacitor are integrated into one, thereby effectively suppressing an excitation surge current generated by no-load closing of the rectifier transformer and limiting impulse currents that are generated instantaneously at two ends of the capacitor when the power grid is connected. Therefore, security of the capacitor and all components of the rectification front end of the frequency converter can be protected and the stable running of the power grid can be ensured; and the development cost for the rectification front end of the frequency converter is lowered. And thus, the provided precharging device is suitable for application to the frequency converter.
Description
Technical field
The utility model belongs to the Frequency Conversion Drive Technology field, is specifically related to a kind of pre-charging device with pre-magnetizing function.
Background technology
Frequency converter is a kind of widely used electric actuator.Conventional frequency converter rectification front end generally adopts the compositions such as rectifier transformer, rectification unit and capacitor, if the frequency converter of this form does not increase any subsidiary loop, has larger impulse current.Reason has two: one, when rectifier transformer drops into electrical network, puts into excitation initially that it is larger to shove, and generally can reach the several times rated current, and this electric current can cause the circuit breaker trip before rectifier transformer, causes pressure drop of grid; The 2nd, if the capacitor initial charge current in the rectification front end does not limit, the impulse current of generation is also larger.
for this problem, typical frequency converter rectification front end all is furnished with subsidiary loop, as shown in Figure 1, it comprises a major loop that is connected with electrical network 8 by circuit breaker 7, described major loop is by rectifier transformer 1, 12 pulsating wave rectifier 2 and capacitor C1 form, be serially connected with independently precharge loop 9 on capacitor C1 and carry out precharge, also be connected with the pre-magnetizing loop 10 that is consisted of by 1:1 rectifier transformer and switching device between described major loop and electrical network 8, carry out the pre-magnetizing of rectifier transformer with this, thereby the defective of this pre-charging device is to produce impulse current electrical network is brought adverse effect.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming that existing frequency converter rectification front end rectifier transformer pre-magnetizing, capacitor precharge work alone, and proposes a kind of integrated subsidiary loop device of pre-magnetizing, precharge that prevents impulse current.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of pre-charging device with pre-magnetizing function, comprise a major loop and a subsidiary loop, described major loop is comprised of rectifier transformer, 12 pulsating wave rectifier and some capacitors, described subsidiary loop is comprised of contactor, pressure regulation reactor and step-up transformer, major loop connects electrical network by circuit breaker, and subsidiary loop is connected between major loop and electrical network.
Wherein, the secondary of described rectifier transformer is connected with the interchange input side of 12 pulsating wave rectifier, and the direct current outlet side of described 12 pulsating wave rectifier is connected to the both sides of capacitor.
Wherein, described contactor is three-phase ac contactor, described pressure regulation reactor is the three phase ac voltage regulation reactor, the two ends of contactor connect respectively electrical network and pressure regulation reactor, the other end of pressure regulation reactor is connected with the low-pressure end of step-up transformer, and the high-pressure side of step-up transformer is connected with the former limit of rectifier transformer.
In addition, described step-up transformer connection group is Dd0.The capacity of described step-up transformer is 1 ‰ of rectifier transformer.No-load voltage ratio≤the 1:1.3 of described step-up transformer.
The beneficial effects of the utility model are: adopt simple electric loop structure that pre-magnetizing and the capacitor pre-charging functions of rectifier transformer in frequency converter rectification front end are united two into one; the magnetizing inrush current that produces in the time of effectively suppressing the rectifier transformer idle-loaded switching-on; also limited the impulse current at electrical network connection moment capacitor two ends; thereby the safety of capacitor for voltage protection and each components and parts of frequency converter rectification front end; guarantee the stable operation of electrical network; also reduce simultaneously the development cost of frequency converter rectification front end, be suitable for application of frequency converter.
Description of drawings
Fig. 1 is the structure principle chart of traditional pre-charging device;
Fig. 2 is structure principle chart of the present utility model.
Wherein each token name is called: C1-capacitor, 1-rectifier transformer, 2-12 pulsating wave rectifier, 3-contactor, 4-pressure regulation reactor, 5-step-up transformer, 6-capacitor, 7-circuit breaker, 8-electrical network, 9-precharge loop, 10-pre-magnetizing loop.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
with reference to shown in Figure 2, the utility model discloses a kind of pre-charging device with pre-magnetizing function, comprise a major loop and a subsidiary loop that is used for rectifier transformer pre-magnetizing and capacitor precharge, described major loop is by rectifier transformer 1, 12 pulsating wave rectifier 2 and some capacitors 6 form, described subsidiary loop is by contactor 3, pressure regulation reactor 4 and step-up transformer 5 form, major loop connects electrical network 8 by circuit breaker 7, subsidiary loop is connected between major loop and electrical network 8, this pre-charging device adopts a simple loop to realize simultaneously the pre-magnetizing of rectifier transformer 1 and the precharge of capacitor, and well limited its peak current, when having reduced frequency converter rectification front end and having dropped into to the impact of electrical network 8, described rectifier transformer 1 is common three-winding transformer, 12 pulsating wave rectifier 2 is not controlled rectifier bridge for common diode forms, capacitor 6 is common electrolytic capacitor.
wherein, the secondary of described rectifier transformer 1 is connected with the interchange input side of 12 pulsating wave rectifier 2, the direct current outlet side of described 12 pulsating wave rectifier 2 is connected to the both sides of capacitor 6, described contactor 3 is common three-phase ac contactor, described pressure regulation reactor 4 is common three phase ac voltage regulation reactor, described step-up transformer 5 is common step-up transformer, the two ends of contactor 3 connect respectively electrical network 8 and pressure regulation reactor 4, the other end of pressure regulation reactor 4 is connected with the low-pressure end of step-up transformer 5, the high-pressure side of step-up transformer 5 is connected with the former limit of rectifier transformer 1.
In addition, it is Dd0 that described step-up transformer 5 connects group, the capacity of described step-up transformer 5 is 1 ‰ of rectifier transformer 1, no-load voltage ratio≤the 1:1.3 of described step-up transformer 5, when designing, the resistance value of pressure regulation reactor 4 guarantees to satisfy the output voltage of subsidiary loop by adjusting, be step-up transformer 5 secondary voltages a little more than line voltage, for example the line voltage of 1.05 times gets final product.
During debugging, then the contactor 3 in combined floodgate figure regulates secondary voltage that pressure regulation reactor 4 makes step-up transformer 5 a little more than line voltage, for example the line voltage of 1.05 times.
During application, first closing contactor 3, combined floodgate circuit breaker 7 after time-delay a period of time, disjunction contactor 3 after circuit breaker 7 closes a floodgate, complete the input process of frequency converter rectification front end, delay time is determined by the time constant in loop, can measure by test method, adopt the pressure regulation reactor to finely tune, satisfy various requirement.
Metering function due to pressure regulation reactor and step-up transformer 5 short-circuit impedances, after closing a floodgate, can well limit by contactor 3 charging current of magnetizing inrush current and the capacitor 6 of rectifier transformer 1, and owing to adopting step-up transformer 5, step-up transformer 5 secondary voltages are a little more than the voltage of electrical network 8, so after capacitor 6 chargings finish, direct voltage is a little more than the direct voltage after directly charging by rectifier transformer 1, the input of rectification front end will be completed when circuit breaker 7 closes a floodgate like this, and the secondary pulse electric current can not be produced.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only; and the embodiment of part utilization; for the person of ordinary skill of the art; under the prerequisite that does not break away from the utility model creation design; can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (6)
1. pre-charging device with pre-magnetizing function, comprise a major loop and a subsidiary loop, it is characterized in that: described major loop is comprised of rectifier transformer (1), 12 pulsating wave rectifier (2) and some capacitors (6), described subsidiary loop is comprised of contactor (3), pressure regulation reactor (4) and step-up transformer (5), major loop connects electrical network (8) by circuit breaker (7), and subsidiary loop is connected between major loop and electrical network (8).
2. a kind of pre-charging device with pre-magnetizing function according to claim 1, it is characterized in that, the secondary of described rectifier transformer (1) is connected with the interchange input side of 12 pulsating wave rectifier (2), and the direct current outlet side of described 12 pulsating wave rectifier (2) is connected to the both sides of capacitor (6).
3. a kind of pre-charging device with pre-magnetizing function according to claim 1 and 2, it is characterized in that, described contactor (3) is three-phase ac contactor, described pressure regulation reactor (4) is the three phase ac voltage regulation reactor, the two ends of contactor (3) connect respectively electrical network (8) and pressure regulation reactor (4), the other end of pressure regulation reactor (4) is connected with the low-pressure end of step-up transformer (5), and the high-pressure side of step-up transformer (5) is connected with the former limit of rectifier transformer (1).
4. a kind of pre-charging device with pre-magnetizing function according to claim 3, is characterized in that, it is Dd0 that described step-up transformer (5) connects group.
5. a kind of pre-charging device with pre-magnetizing function according to claim 4, is characterized in that, the capacity of described step-up transformer (5) is 1 ‰ of rectifier transformer (1).
6. a kind of pre-charging device with pre-magnetizing function according to claim 5, is characterized in that, the no-load voltage ratio≤1:1.3 of described step-up transformer (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320260554 CN203278635U (en) | 2013-05-14 | 2013-05-14 | Precharging device having pre-magnetizing function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320260554 CN203278635U (en) | 2013-05-14 | 2013-05-14 | Precharging device having pre-magnetizing function |
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| CN203278635U true CN203278635U (en) | 2013-11-06 |
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| CN 201320260554 Expired - Lifetime CN203278635U (en) | 2013-05-14 | 2013-05-14 | Precharging device having pre-magnetizing function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048410A (en) * | 2015-08-26 | 2015-11-11 | 上海船舶研究设计院 | Power transformer pre-excitation system of diving support boat |
| CN108199567A (en) * | 2017-12-29 | 2018-06-22 | 北京合康新能变频技术有限公司 | A kind of pre-charging device and method of middle pressure big-power transducer |
| CN110661241A (en) * | 2019-10-16 | 2020-01-07 | 广东电网有限责任公司 | Method, device and equipment for suppressing inrush current of transformer |
| CN111865177A (en) * | 2020-07-29 | 2020-10-30 | 青岛中加特电气股份有限公司 | Power supply system for supplying power to frequency converter, frequency conversion system and pre-magnetizing method |
| CN114465494A (en) * | 2021-12-14 | 2022-05-10 | 广东福德电子有限公司 | Direct-current power supply of high-power pulse load and control method |
| CN117117794A (en) * | 2023-10-12 | 2023-11-24 | 广东省洛仑兹技术股份有限公司 | Transformer pre-magnetizing circuit and control method thereof |
-
2013
- 2013-05-14 CN CN 201320260554 patent/CN203278635U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048410A (en) * | 2015-08-26 | 2015-11-11 | 上海船舶研究设计院 | Power transformer pre-excitation system of diving support boat |
| CN108199567A (en) * | 2017-12-29 | 2018-06-22 | 北京合康新能变频技术有限公司 | A kind of pre-charging device and method of middle pressure big-power transducer |
| CN110661241A (en) * | 2019-10-16 | 2020-01-07 | 广东电网有限责任公司 | Method, device and equipment for suppressing inrush current of transformer |
| CN110661241B (en) * | 2019-10-16 | 2022-01-11 | 广东电网有限责任公司 | Method, device and equipment for suppressing inrush current of transformer |
| CN111865177A (en) * | 2020-07-29 | 2020-10-30 | 青岛中加特电气股份有限公司 | Power supply system for supplying power to frequency converter, frequency conversion system and pre-magnetizing method |
| CN114465494A (en) * | 2021-12-14 | 2022-05-10 | 广东福德电子有限公司 | Direct-current power supply of high-power pulse load and control method |
| CN117117794A (en) * | 2023-10-12 | 2023-11-24 | 广东省洛仑兹技术股份有限公司 | Transformer pre-magnetizing circuit and control method thereof |
| CN117117794B (en) * | 2023-10-12 | 2024-02-27 | 广东省洛仑兹技术股份有限公司 | Transformer pre-magnetizing circuit and control method thereof |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20131106 |
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