CN107831375A - A kind of method for detecting open phase of current transformer - Google Patents
A kind of method for detecting open phase of current transformer Download PDFInfo
- Publication number
- CN107831375A CN107831375A CN201710869009.XA CN201710869009A CN107831375A CN 107831375 A CN107831375 A CN 107831375A CN 201710869009 A CN201710869009 A CN 201710869009A CN 107831375 A CN107831375 A CN 107831375A
- Authority
- CN
- China
- Prior art keywords
- phase
- current
- current transformer
- frequency converter
- electric machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to electric and electronic technical field, a kind of more particularly to method for detecting open phase of current transformer, it can apply to an electric machine control system, electric machine control system includes a frequency converter and the three phase electric machine being connected with frequency converter, and a current transformer is connected in each phase of three phase electric machine；Wherein, including：Step S1, the output voltage of frequency converter is set at less than to a setting magnitude of voltage of rated value；Step S2, judges whether the output current of the current transformer in each phase of three phase electric machine is all higher than a standard current value；If so, power on operation then is carried out to frequency converter；If it is not, then current transformer of the output current less than standard current value is safeguarded；The detection of open-phase fault can be carried out to current transformer, the reliability service of current transformer is ensure that, ensure that and can be detected in time with the failure of current transformer relevant device.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of method for detecting open phase of current transformer.
Background technology
High voltage converter is the break-make by effectively controlling power semiconductor device, and power frequency supply is transformed into another frequency
Electric energy control device.Because the rotational frequency of dragged motor is adjustable, thus load can effectively using electricity wisely, realize highest
Operating efficiency.At present, high voltage converter perseverance V/f controls, vector controlled, Direct Torque Control, Speedless sensor vector control
The multiple control modes such as system.But every kind of control mode is required for actually detected value of the motor side per phase current, to be closed
Ring controls.Therefore, current transformer turns into device indispensable on high voltage frequency changer structure, by carrying out current closed-loop control
System, it is possible to increase the overall control performance of high voltage converter, be allowed to dynamic response faster, steady-state response is more steady, improves rotating speed
Precision, load capacity.
But high voltage converter is arranged on user scene, natural disaster or human factor for a long time, it some times happens that Current Mutual Inductance
The situation of device damage, current transformer phase shortage inspection is not carried out before upper electricity operation in the prior art, if current transformer
There is open-phase fault, whole control closed loop will be influenceed, generation overcurrent, high-power insulated gate bipolar transistor burn, and then
Cause the major accident shut down.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of method for detecting open phase of current transformer, applied to a motor control
System processed, the electric machine control system include a frequency converter and the three phase electric machine being connected with the frequency converter, the three-phase electricity
A current transformer is connected in each phase of machine；Wherein, including：
Step S1, the output voltage of the frequency converter is set at less than to a setting magnitude of voltage of rated value；
Step S2, judges whether the output current of the current transformer in each phase of the three phase electric machine is all higher than
One standard current value；
If so, power on operation then is carried out to the frequency converter；If it is not, then to output current less than the standard current value
The current transformer is safeguarded.
Above-mentioned method for detecting open phase, wherein, the rated value of the output voltage as the frequency converter that sets magnitude of voltage
3%~7%.
Above-mentioned method for detecting open phase, wherein, the rated value of the output voltage as the frequency converter that sets magnitude of voltage
5%.
Above-mentioned method for detecting open phase, wherein, the standard current value is the volume of the output current of the current transformer
The 8%~12% of definite value.
Above-mentioned method for detecting open phase, wherein, the standard current value is the volume of the output current of the current transformer
The 10% of definite value.
Above-mentioned method for detecting open phase, wherein, the rated value of the output voltage of the frequency converter is 6kV or 10kV.
Above-mentioned method for detecting open phase, wherein, the three phase electric machine is threephase asynchronous machine.
Beneficial effect：A kind of method for detecting open phase of current transformer proposed by the present invention, can enter to current transformer
The detection of row open-phase fault, the reliability service of current transformer is ensure that, ensure that the failure with current transformer relevant device
It can be detected in time.
Brief description of the drawings
Fig. 1 is the step flow chart of the method for detecting open phase of current transformer in one embodiment of the invention.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
In a preferred embodiment, as shown in Figure 1, it is proposed that a kind of method for detecting open phase of current transformer, can
With applied to an electric machine control system, electric machine control system includes a frequency converter and the three phase electric machine being connected with frequency converter, and three
A current transformer is connected in each phase of phase motor；Wherein it is possible to including：
Step S1, the output voltage of frequency converter is set at less than to a setting magnitude of voltage of rated value；
Step S2, judges whether the output current of the current transformer in each phase of three phase electric machine is all higher than a standard electric
Flow valuve；
If so, power on operation then is carried out to frequency converter；If it is not, then it is less than the Current Mutual Inductance of standard current value to output current
Device is safeguarded.
In above-mentioned technical proposal, due to being both provided with a current transformer, therefore electric current in each phase of three phase electric machine
Transformer whether there is open-phase fault, directly determine whether the current transformer is effective, that is, determine the current transformer energy
Situation corresponding to no correct reflection three phase electric machine in phase, if current transformer has open-phase fault, when three phase electric machine is corresponding
When mutually breaking down, then can not in time find, delay maintenance time；Using the method for detecting open phase of the present invention, Ke Yi
Current transformer is detected before electricity on current transformer, ensures that current transformer does not have open-phase fault.
The present invention principle be, exemplified by setting magnitude of voltage as the 5% of the rated value of the output voltage of frequency converter, now by
Not turning in motor, energized circuit is equivalent to disconnection, and 20% or so of impedance when motor equiva lent impedance is reduced to specified, this time-varying
25% when the output current of frequency device can reach specified in theory, 10% when standard current value accordingly being set as into specified
Left and right, when the electric current in the phase that corresponding current transformer detects can reach more than standard current value, that is, judge the phase
On current transformer phase shortage problem is not present.
In a preferred embodiment, magnitude of voltage is set as the 3%~7% of the rated value of the output voltage of frequency converter.
In above-described embodiment, it is preferable that set magnitude of voltage as the 5% of the rated value of the output voltage of frequency converter.
In a preferred embodiment, standard current value for current transformer output current rated value 8%~
12%.
In above-described embodiment, it is preferable that standard current value is the 10% of the rated value of the output current of current transformer.
In a preferred embodiment, the rated value of the output voltage of frequency converter is 6kV (kilovolt) or 10kV.
In a preferred embodiment, three phase electric machine can be threephase asynchronous machine, but this is only a kind of preferable
Situation, it is not construed as limitation of the present invention.
By explanation and accompanying drawing, the exemplary embodiments of the specific structure of embodiment are given, it is smart based on the present invention
God, it can also make other conversions.Although foregoing invention proposes existing preferred embodiment, however, these contents are not intended as
Limitation.
For a person skilled in the art, after reading described above, various changes and modifications undoubtedly will be evident.
Therefore, appended claims should regard whole variations and modifications of the true intention and scope that cover the present invention as.Weighing
Any and all scope and content of equal value, are all considered as still belonging to the intent and scope of the invention in the range of sharp claim.
Claims (7)
1. a kind of method for detecting open phase of current transformer, applied to an electric machine control system, the electric machine control system includes
One frequency converter and the three phase electric machine being connected with the frequency converter, an electric current is connected in each phase of the three phase electric machine
Transformer；It is characterised in that it includes：
Step S1, the output voltage of the frequency converter is set at less than to a setting magnitude of voltage of rated value；
Step S2, judges whether the output current of the current transformer in each phase of the three phase electric machine is all higher than a mark
Quasi- current value；
If so, power on operation then is carried out to the frequency converter；If it is not, then to output current less than described in the standard current value
Current transformer is safeguarded.
2. method for detecting open phase according to claim 1, it is characterised in that the magnitude of voltage that sets is the frequency converter
The 3%~7% of the rated value of output voltage.
3. method for detecting open phase according to claim 2, it is characterised in that the magnitude of voltage that sets is the frequency converter
The 5% of the rated value of output voltage.
4. method for detecting open phase according to claim 1, it is characterised in that the standard current value is the Current Mutual Inductance
The 8%~12% of the rated value of the output current of device.
5. method for detecting open phase according to claim 4, it is characterised in that the standard current value is the Current Mutual Inductance
The 10% of the rated value of the output current of device.
6. method for detecting open phase according to claim 1, it is characterised in that the rated value of the output voltage of the frequency converter
For 6kV or 10kV.
7. method for detecting open phase according to claim 1, it is characterised in that the three phase electric machine is threephase asynchronous machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710869009.XA CN107831375A (en) | 2017-09-22 | 2017-09-22 | A kind of method for detecting open phase of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710869009.XA CN107831375A (en) | 2017-09-22 | 2017-09-22 | A kind of method for detecting open phase of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107831375A true CN107831375A (en) | 2018-03-23 |
Family
ID=61644046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710869009.XA Pending CN107831375A (en) | 2017-09-22 | 2017-09-22 | A kind of method for detecting open phase of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107831375A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557186A (en) * | 2009-05-20 | 2009-10-14 | 和平电气有限公司 | Maintenance-free motor soft starter with self-checking function |
| CN101916982A (en) * | 2010-08-09 | 2010-12-15 | 宁波奥克斯空调有限公司 | Judgement and protection method for open phase of frequency-conversion air conditioner compressor |
| CN102798770A (en) * | 2012-08-09 | 2012-11-28 | 中国西电电气股份有限公司 | Method for detecting default phase of frequency converter |
| CN103197158A (en) * | 2013-03-26 | 2013-07-10 | 深圳市英威腾电气股份有限公司 | Three-phase power grid phase loss detection method and circuit |
| CN105467227A (en) * | 2015-12-01 | 2016-04-06 | 长沙奥托自动化技术有限公司 | Method for detecting output phase loss of frequency converter |
| CN106249062A (en) * | 2016-08-28 | 2016-12-21 | 上海新时达电气股份有限公司 | The method for detecting open phase of a kind of three phase electric machine and system |
| CN106645995A (en) * | 2016-09-23 | 2017-05-10 | 上海新时达电气股份有限公司 | Three-phase motor open-phase detection method and system |
-
2017
- 2017-09-22 CN CN201710869009.XA patent/CN107831375A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557186A (en) * | 2009-05-20 | 2009-10-14 | 和平电气有限公司 | Maintenance-free motor soft starter with self-checking function |
| CN101916982A (en) * | 2010-08-09 | 2010-12-15 | 宁波奥克斯空调有限公司 | Judgement and protection method for open phase of frequency-conversion air conditioner compressor |
| CN102798770A (en) * | 2012-08-09 | 2012-11-28 | 中国西电电气股份有限公司 | Method for detecting default phase of frequency converter |
| CN103197158A (en) * | 2013-03-26 | 2013-07-10 | 深圳市英威腾电气股份有限公司 | Three-phase power grid phase loss detection method and circuit |
| CN105467227A (en) * | 2015-12-01 | 2016-04-06 | 长沙奥托自动化技术有限公司 | Method for detecting output phase loss of frequency converter |
| CN106249062A (en) * | 2016-08-28 | 2016-12-21 | 上海新时达电气股份有限公司 | The method for detecting open phase of a kind of three phase electric machine and system |
| CN106645995A (en) * | 2016-09-23 | 2017-05-10 | 上海新时达电气股份有限公司 | Three-phase motor open-phase detection method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102484448B (en) | Variable coil configuration system, apparatus and method | |
| CN103812209B (en) | For the system for the operation for improving STS during voltage disturbance | |
| US20020067628A1 (en) | AC interconnection apparatus and control method therefor | |
| CN105103427B (en) | Insulated gate semiconductor device | |
| CN103138674B (en) | High-power brushless double-fed motor variable frequency speed control system and control method | |
| CN105471309A (en) | Inverter control apparatus, power conversion apparatus, and electric vehicle | |
| CN107591789A (en) | A kind of three phase variable frequency alternating current power-generating system over-voltage suppression device | |
| CN103296945A (en) | Feed chain of a synchronous electric machine, electric traction system including such a chain and method for controlling such a chain | |
| Li et al. | Fast fault protection based on direction of fault current for the high-surety power-supply system | |
| CN203340017U (en) | Frequency control system for large-power brushless double-feed motor | |
| CN102116850B (en) | Device and method for testing rectifier | |
| CN110521076A (en) | Power supply device | |
| JP2004236469A (en) | Instantaneous high power supply | |
| CN107831375A (en) | A kind of method for detecting open phase of current transformer | |
| CN113644686B (en) | Energy feedback system and control method | |
| CN101888188A (en) | The apparatus and method that are used for the power controlling converter | |
| EP2230757B1 (en) | Method for mitigating negative sequence effect resulting from non-symmetrical short circuit failure of synchronous electric machine based systems | |
| CN103916070A (en) | Three-phase asynchronous motor minimum input power energy saving device and application method thereof | |
| TW201503532A (en) | Power supply apparatus with controllable multiple input rectification | |
| CN105656297A (en) | Discharging method of direct driving type wind turbine generator system converter direct-current bus | |
| CN207098594U (en) | Compressor phase shortage fast tripping protection device | |
| CN102959819B (en) | For the system and method for the raising energy efficiency in cooling device compressor | |
| CN206743146U (en) | A kind of brushless dual-feed motor starts control device | |
| CN203825516U (en) | Double winding voltage-adjusting control system | |
| CN203590045U (en) | Power supply for ozone generator and ozone generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180323 |
|
| RJ01 | Rejection of invention patent application after publication |