CN102684598A - Grounding circuit of high-power system with frequency conversion device - Google Patents
Grounding circuit of high-power system with frequency conversion device Download PDFInfo
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- CN102684598A CN102684598A CN2012101798819A CN201210179881A CN102684598A CN 102684598 A CN102684598 A CN 102684598A CN 2012101798819 A CN2012101798819 A CN 2012101798819A CN 201210179881 A CN201210179881 A CN 201210179881A CN 102684598 A CN102684598 A CN 102684598A
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- frequency converter
- supply transformer
- motor
- grounding
- power system
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Abstract
The invention discloses a grounding circuit of a high-power system with a frequency conversion device, which is characterized by comprising a supply transformer, a frequency converter, a motor and a distribution cabinet, a control cabinet and corresponding devices; the input end of the supply transformer is connected with an external high-voltage power supply, the output end of the supply transformer is connected with the frequency converter, and the zero line of the supply transformer is directly grounded to an independent ground; the frequency converter is connected with the motor; and the grounding line of the motor and the ground wires of the distribution cabinet, and the control cabinet and the corresponding devices are grounded to another independent ground. According to the grounding line, a current circuit formed by the frequency converter, a grid, the zero line and the grounding wire is prevented via a simple structure, so that the situation that grid system voltage boost is caused after the grounding of the frequency converter is avoided, and besides, owing to simple structure, convenience in production and low cost, the grounding circuit is applicable to wide generalization.
Description
Technical field
The present invention relates to a kind of system earth circuit, relate in particular to a kind of earthed circuit that comprises the high-power system of converter plant.
Background technology
Along with frequency converter is used more and more widely; The electric power system voltage rising phenomenon that causes because of frequency converter drive motors insulation damages is becoming a kind of FAQs gradually; Especially particularly outstanding in high-power system, but this phenomenon is difficult to explain with the electrotechnics general knowledge.After the motor one phase winding insulation damages of converter plant control; When if frequency converter starts, the three-phase alternating voltage of its output will be added on the supply transformer low-pressure side power frequency three phase mains through Electric Machine Control power line, electric machine iron core, earth connection, the electric power system neutral line.Because frequency converter, supply transformer constitute big current path through power lines such as earth connection, zero lines, three-phase alternating voltage frequency, the initial phase of frequency converter output all are different from the electrical network power-frequency voltage.Then cause different frequency supply voltage superposition phenomenon, the degree of its stack and frequency inverter capacity, operating frequency, initial phase and supply transformer capacity all have substantial connection.Frequency inverter capacity is big more, and load current is big more during startup, and then the voltage after the stack is high more, and its extent of injury is also serious more.The current circuit that frequency converter, electrical network, zero line and earth connection constitute.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop a kind of avoiding because of causing the novel grounded circuit that network system voltage raises after the converter plant output ground connection.The technical scheme that the present invention adopts is following:
A kind of earthed circuit that comprises the high-power system of converter plant is characterized in that comprising supply transformer, frequency converter, motor and power distribution cabinet, control cubicle and relevant device;
The input of said supply transformer is connected with the external high pressure power supply, and output is connected with frequency converter, and the zero line of supply transformer is directly received independently and gone up; Said frequency converter is connected with motor, and the ground wire of the same power distribution cabinet of the earth connection of said motor, control cubicle and relevant device is connected on another jointly and goes up independently.
The three phase mains of the input of said supply transformer is respectively through being connected to the ground of supply transformer zero line ground connection behind the unidirectional electrical appliance.
Owing to adopted technique scheme, novel grounded circuit provided by the invention has been avoided the current circuit of frequency converter, electrical network, zero line and earth connection formation through a kind of simple structure, thereby avoids causing that network system voltage raises after the converter plant output ground connection.In addition,, be convenient to produce, and with low costly be suitable for extensive popularization because it is simple in structure.
Description of drawings
The present invention only comprises a width of cloth accompanying drawing:
Fig. 1 is the structural representation of circuit according to the invention.
Embodiment
Like said this earthed circuit of Fig. 1, comprise supply transformer, frequency converter, motor and power distribution cabinet, control cubicle and relevant device; The input of said supply transformer is connected with the external high pressure power supply, and output is connected with frequency converter, and the zero line of supply transformer is directly received independently and gone up; Said frequency converter is connected with motor, and the ground wire of the same power distribution cabinet of the earth connection of said motor, control cubicle and relevant device is connected on another jointly and goes up independently.The three phase mains of the input of said supply transformer is respectively through being connected to the ground of supply transformer zero line ground connection behind the unidirectional electrical appliance.For preventing that similar fault from causing the electric power system electric voltage exception to take place once more, the protection connecting to neutral line of motor earth connection, as shown in Figure 1.Make electric power system transformer neutral line zero line and motor earth connection separate, and the two ground connection independently is provided with earthing device respectively, can not constitute big current path like this between the earth connection of equipment and the electric power system zero line.Then can avoid because of causing after the converter plant output ground connection that the phenomenon that network system voltage raises takes place.In reality; After converter plant one phase ground connection; Its earth current constitutes the loop through earth connection, the earth, the electric power system neutral line; Voltage drop after its stack then can be born by the earth whole or in part, and the voltage of electric energy equipment such as electric power system, converter plant the phenomenon that significantly raises can not occur.For proving the reliability of this result; Carrying out the fault simulation test,, starting converter plant through frequency converter one phase artificial ground; Record electric power system three phase mains voltage to earth no change in the frequency converter start-up course, phenomenon does not appear devoting oneself to work automatically in the frequency converter brake resistance yet.
The above; Be merely the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or change according to technical scheme of the present invention and inventive concept thereof in the technical scope that the present invention discloses, all should be encompassed within protection scope of the present invention.
Claims (2)
1. an earthed circuit that comprises the high-power system of converter plant is characterized in that comprising supply transformer, frequency converter, motor and power distribution cabinet, control cubicle and relevant device;
The input of said supply transformer is connected with the external high pressure power supply, and output is connected with frequency converter, and the zero line of supply transformer is directly received independently and gone up; Said frequency converter is connected with motor, and the ground wire of the same power distribution cabinet of the earth connection of said motor, control cubicle and relevant device is connected on another jointly and goes up independently.
2. according to the said earthed circuit that comprises the high-power system of converter plant of claim 1, the three phase mains of input that it is characterized in that said supply transformer is respectively through being connected to the ground of supply transformer zero line ground connection behind the unidirectional electrical appliance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101798819A CN102684598A (en) | 2012-06-01 | 2012-06-01 | Grounding circuit of high-power system with frequency conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101798819A CN102684598A (en) | 2012-06-01 | 2012-06-01 | Grounding circuit of high-power system with frequency conversion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102684598A true CN102684598A (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101798819A Pending CN102684598A (en) | 2012-06-01 | 2012-06-01 | Grounding circuit of high-power system with frequency conversion device |
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| CN (1) | CN102684598A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188825A (en) * | 1998-12-22 | 2000-07-04 | Meidensha Corp | Grounding system and protective system for incoming and distributing facility |
| CN201656911U (en) * | 2009-12-15 | 2010-11-24 | 上海地澳自动化科技有限公司 | Mine high-power tri-level variable frequency speed control device |
| CN202133745U (en) * | 2011-06-07 | 2012-02-01 | 山东希波电气科技股份有限公司 | Online detecting device of shelf depreciation of a high-voltage cable used for a high-speed railway engine |
| CN202798564U (en) * | 2012-06-01 | 2013-03-13 | 郭宝利 | Grounding circuit of high-power system with frequency conversion device |
-
2012
- 2012-06-01 CN CN2012101798819A patent/CN102684598A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188825A (en) * | 1998-12-22 | 2000-07-04 | Meidensha Corp | Grounding system and protective system for incoming and distributing facility |
| CN201656911U (en) * | 2009-12-15 | 2010-11-24 | 上海地澳自动化科技有限公司 | Mine high-power tri-level variable frequency speed control device |
| CN202133745U (en) * | 2011-06-07 | 2012-02-01 | 山东希波电气科技股份有限公司 | Online detecting device of shelf depreciation of a high-voltage cable used for a high-speed railway engine |
| CN202798564U (en) * | 2012-06-01 | 2013-03-13 | 郭宝利 | Grounding circuit of high-power system with frequency conversion device |
Non-Patent Citations (1)
| Title |
|---|
| 朱涛: "在此阿勇变频器控制系统中接地问题的研究", 《机电国际市场》 * |
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Application publication date: 20120919 |