CN107561439B - A kind of ground detecting method of converter oxygen gun Frequency Converter Control motor - Google Patents
A kind of ground detecting method of converter oxygen gun Frequency Converter Control motor Download PDFInfo
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- CN107561439B CN107561439B CN201710557183.0A CN201710557183A CN107561439B CN 107561439 B CN107561439 B CN 107561439B CN 201710557183 A CN201710557183 A CN 201710557183A CN 107561439 B CN107561439 B CN 107561439B
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- frequency converter
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- control motor
- oxygen gun
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Abstract
The present invention discloses a kind of ground detecting method of converter oxygen gun Frequency Converter Control motor, the ground detecting method includes: the actual motion speed that the speed encoder detects the converter oxygen gun Frequency Converter Control motor, and the actual motion speed is sent to the frequency converter；The frequency converter is by the actual motion speed compared with the given speed that the controller is set；Whether the resistance value that the resistance detector detects the winding of the converter oxygen gun Frequency Converter Control motor is less than or equal to 0.5K ohm.Pass through setting speed detector and resistance detector, detect the actual motion speed and resistance value of the converter oxygen gun Frequency Converter Control motor, by judging whether the speed difference of actual motion speed and given speed is more than or equal to 3HZ, and whether the duration more than or equal to 3HZ is more than or equal to 0.5s, or/and whether the resistance value of the resistance detector detection is less than or equal to 0.5K ohm, determine whether the converter oxygen gun Frequency Converter Control motor occurs unidirectionally to be grounded, anti-falling stop rifle accident occurs.
Description
Technical field
The present invention relates to metallurgy industry steelmaking converter technology field more particularly to a kind of converter oxygen gun Frequency Converter Controls
The ground detecting method of motor.
Background technique
Oxygen lance for steel-making converter control system is the control of AFE SIEMENS S7-200, belongs to three-phase ungrounded power systems.When oxygen rifle is transported
During row, when one phase winding of oxygen rifle motor is grounded, motor line voltage is constant, and electric current also not significantly raised variation causes
Frequency converter can not differentiate that single-phase earthing occurs for oxygen rifle machine winding, at this point, oxygen rifle can continue to run, no matter only operate at this time
Instruction mentions rifle or drop rifle, and oxygen rifle actual act is all drop rifle operation, therefore, is easy to cause Zhui Qiang accident potential, can also make
At motor two-phase even three-phase windings scaling loss.
Summary of the invention
The application provides a kind of ground detecting method of converter oxygen gun Frequency Converter Control motor, solve in the prior art without
Method judges whether oxygen rifle machine winding occurs unidirectionally to be grounded, and oxygen rifle is caused to continue to run, and so as to cause Zhui Qiang accident potential, causes
The technical issues of motor two-phase or even three-phase windings scaling loss.
The application provides a kind of ground detecting method of converter oxygen gun Frequency Converter Control motor, and the ground detecting method is answered
For in a ground detecting system,
The ground detecting system includes: controller, frequency converter, speed encoder, resistance detector, the velocity encoded cine
Device is connect with the converter oxygen gun Frequency Converter Control motor, and the frequency converter is connect with controller and the speed encoder, institute
Resistance detector is stated to connect with the converter oxygen gun Frequency Converter Control motor and the frequency converter；
The ground detecting method includes:
The speed encoder detects the actual motion speed of the converter oxygen gun Frequency Converter Control motor, and by the reality
The border speed of service is sent to the frequency converter；
The actual motion speed compared with the given speed that the controller is set, is judged the speed by the frequency converter
Whether degree difference is more than or equal to 3HZ；
Whether the resistance value that the resistance detector detects the winding of the converter oxygen gun Frequency Converter Control motor is less than
In 0.5K ohm；
It is more than or equal to 3HZ in the speed difference, and the duration is more than or equal to 0.5s or/and the resistance value is less than
When equal to 0.5K ohm, determine that unidirectional ground connection occurs for the converter oxygen gun Frequency Converter Control motor.
Preferably, after determining that unidirectional ground connection occurs for converter oxygen gun Frequency Converter Control motor, the method also includes:
Generate an alarm signal.
Preferably, after determining that unidirectional ground connection occurs for converter oxygen gun Frequency Converter Control motor, the method also includes:
Generate a prompt information.
Preferably, after determining that unidirectional ground connection occurs for converter oxygen gun Frequency Converter Control motor, the method also includes:
Generate control converter oxygen gun Frequency Converter Control motor signal out of service.
Preferably, the resistance detector detect the winding of the converter oxygen gun Frequency Converter Control motor resistance value whether
The actual motion speed of the converter oxygen gun Frequency Converter Control motor is detected in the speed encoder less than or equal to 0.5K ohm
It executes before, or detects the actual motion speed of the converter oxygen gun Frequency Converter Control motor simultaneously with the speed encoder
It executes.
Preferably, the resistance detector detect the winding of the converter oxygen gun Frequency Converter Control motor resistance value whether
Less than or equal to 0.5K ohm in the frequency converter by the actual motion speed compared with the given speed that the controller is set
Execute before, or with the frequency converter by the actual motion speed compared with the given speed that the controller is set simultaneously
It executes.
The application has the beneficial effect that:
The application detects the converter oxygen gun Frequency Converter Control motor by setting speed detector and resistance detector
Actual motion speed and resistance value, by judging whether the speed difference of actual motion speed and given speed is more than or equal to 3HZ,
And it is whether small more than or equal to the resistance value whether duration of 3HZ is more than or equal to 0.5s or/and resistance detector detection
In being equal to 0.5K ohm, determine whether the converter oxygen gun Frequency Converter Control motor occurs unidirectionally to be grounded, anti-falling stop rifle accident hair
Raw, solving can not judge whether oxygen rifle machine winding occurs unidirectionally to be grounded in the prior art, and oxygen rifle is caused to continue to run, thus
The technical issues of leading to Zhui Qiang accident potential, causing motor two-phase or even three-phase windings scaling loss.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment.
Fig. 1 is a kind of knot of the ground detecting system of converter oxygen gun Frequency Converter Control motor of one better embodiment of the application
Structure schematic diagram；
Fig. 2 is the ground detecting system application method flow chart of the converter oxygen gun Frequency Converter Control motor in Fig. 1.
Specific embodiment
The embodiment of the present application solves existing by providing a kind of ground detecting method of converter oxygen gun Frequency Converter Control motor
Having can not judge whether oxygen rifle machine winding occurs unidirectionally to be grounded in technology, oxygen rifle is caused to continue to run, so as to cause pendant rifle thing
Therefore hidden danger, cause motor two-phase even three-phase windings scaling loss the technical issues of.
Technical solution in the embodiment of the present application is above-mentioned technical problem, and general thought is as follows:
The application detects the converter oxygen gun Frequency Converter Control motor by setting speed detector and resistance detector
Actual motion speed and resistance value, by judging whether the speed difference of actual motion speed and given speed is more than or equal to 3HZ,
And it is whether small more than or equal to the resistance value whether duration of 3HZ is more than or equal to 0.5s or/and resistance detector detection
In being equal to 0.5K ohm, determine whether the converter oxygen gun Frequency Converter Control motor occurs unidirectionally to be grounded, anti-falling stop rifle accident hair
Raw, solving can not judge whether oxygen rifle machine winding occurs unidirectionally to be grounded in the prior art, and oxygen rifle is caused to continue to run, thus
The technical issues of leading to Zhui Qiang accident potential, causing motor two-phase or even three-phase windings scaling loss.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
In order to solve can not to judge whether oxygen rifle machine winding occurs unidirectionally to be grounded in the prior art, cause oxygen rifle after reforwarding
Row, so as to cause Zhui Qiang accident potential, cause motor two-phase even three-phase windings scaling loss the technical issues of, the application provides one kind
The ground detecting method of converter oxygen gun Frequency Converter Control motor.The ground detecting method is applied in a ground detecting system.
As shown in Figure 1, a kind of structural schematic diagram of the ground detecting system for converter oxygen gun Frequency Converter Control motor.It is described
Oxygen rifle control system is the control of AFE SIEMENS S7-200, and Rated motor voltage is 690V, wye connection, three-phase ungrounded power systems.
The ground detecting system includes: controller 10, frequency converter 20, speed encoder 30, resistance detector 40.
The controller 10 is for setting given speed.The speed encoder 30 and the converter oxygen gun Frequency Converter Control
Motor 50 connects, for detecting the actual motion speed of the converter oxygen gun Frequency Converter Control motor 50.
The frequency converter 20 is connect with controller 10 and the speed encoder 30, receive the controller 10 to constant speed
The actual motion speed of degree and the converter oxygen gun Frequency Converter Control motor 50 of the speed encoder 30 detection.The frequency conversion
The given speed and the actual motion speed are compared by device 20, are determined whether to generate alarm signal according to comparison result
Number.
The resistance detector 40 is connect with motor 50, for detecting the resistance of 50 winding of motor.When resistance detector 40
When detecting that the resistance of 50 winding of motor is less than preset value, resistance detector 40 generates alarm signal, and is sent to frequency converter 20.
Specifically, breaker is provided between the resistance detector 20 and the frequency converter 20.
As shown in Fig. 2, the ground detecting method the following steps are included:
Step 110, the speed encoder 30 detects the actual motion speed of the converter oxygen gun Frequency Converter Control motor 50
Degree, and the actual motion speed is sent to the frequency converter 20；
Step 120, the given speed ratio that the frequency converter 20 sets the actual motion speed and the controller 10
Compared with judging whether the speed difference is more than or equal to 3HZ；Duration refers to that frequency converter 20 is detecting given speed and reality
After speed difference between the speed of service is more than or equal to 3HZ, after needing to continue the regular hour, frequency converter 20 generates alarm.
Step 130, the resistance detector 40 detects the resistance of the winding of the converter oxygen gun Frequency Converter Control motor 50
Whether value is less than or equal to 0.5K ohm；
Wherein, step 130 can execute prior to step 110, can also be performed simultaneously with step 110, step 120.
Step 140, it is more than or equal to 3HZ in the speed difference, and the duration is more than or equal to 0.5s or/and the electricity
Resistance value is less than or equal to 0.5K ohm, determines that the converter oxygen gun Frequency Converter Control motor 50 occurs unidirectionally to be grounded, at this point it is possible to raw
At an audible ringing signal or prompt information, the control converter oxygen gun Frequency Converter Control motor also can be generated and stop fortune
Capable signal.
That is, being more than or equal to 3HZ in the speed difference, and the duration is more than or equal to 0.5s or the resistance value is
It is no to be less than or equal to 0.5K ohm, determine that the converter oxygen gun Frequency Converter Control motor 50 has occurred unidirectionally to be grounded；Alternatively, the speed
It spends difference and is more than or equal to 3HZ, and the duration is more than or equal to 0.5s, and whether the resistance value is less than or equal to 0.5K ohm, really
The fixed converter oxygen gun Frequency Converter Control motor 50 has occurred unidirectionally to be grounded.
Such as: when oxygen rifle provides promotion order, given speed is positive speed, under normal circumstances the velocity encoded cine of motor institute band
Device feedback with it is given the same, i.e., it is given and feedback speed difference is almost 0.But one phase winding of motor be grounded when, promoted oxygen rifle to
The given speed of upper operation is positive speed, and practical oxygen rifle is run down (the reason is that after one phase of machine winding is grounded, although electric
Machine line voltage is constant, but output torque greatly reduces, and can not carry oxygen rifle, is lower than oxygen rifle self gravity, so oxygen rifle is at it
Under self weight, run down), given speed (positive speed) subtracts actual coding device feedback speed (run down is negative speed at this time
Degree), difference is greater than speed fiducial value 3HZ soon.
When oxygen rifle provides decline order, given speed is negative velocity, under normal circumstances the speed encoder of motor institute band
Feedback with it is given the same, i.e., it is given and feedback speed fiducial value is almost 0.But one phase winding of motor be grounded when, promoted oxygen rifle to
The given speed of lower operation is negative velocity, and practical oxygen rifle be still the speed run down, but run down accelerate (the reason is that
According to the principle of power, when motor output torque is equal with oxygen rifle self weight, oxygen rifle travels at the uniform speed, and after one phase of machine winding ground connection,
Although motor line voltage is constant, output torque is greatly reduced, and is lower than oxygen rifle self gravity, so oxygen rifle is under its own weight,
Acceleration is run down), given speed (negative velocity) subtracts actual coding device feedback speed (running down is negative velocity) at this time, poor
Value is likely larger than 3HZ, it is also possible between 0-3HZ, then the resistance value for just needing to detect at this time using resistance detection mode
Lower than the alarming value of setting.
Either oxygen rifle provides promotion order or decline order, and resistance detection alarming value all may specific rate manner of comparison
Fastly, when but promoting order, when being in most cases that speed manner of comparison is fast, and declining order, resistance detection mode is fastlyer.
The application detects the converter oxygen gun Frequency Converter Control motor 50 by setting speed detector and resistance detector
Actual motion speed and resistance value, by judging whether the speed difference of actual motion speed and given speed is more than or equal to
3HZ, and the duration more than or equal to 3HZ whether is more than or equal to 0.5s or/and the resistance value of resistance detector detection is
It is no to be less than or equal to 0.5K ohm, determine whether the converter oxygen gun Frequency Converter Control motor 50 occurs unidirectionally to be grounded, anti-falling stop rifle
Accident occurs, and solving can not judge whether oxygen rifle machine winding occurs unidirectionally to be grounded in the prior art, cause oxygen rifle after reforwarding
Row, so as to cause Zhui Qiang accident potential, cause motor two-phase even three-phase windings scaling loss the technical issues of.
Steps are as follows for specific installation execution:
Step S1: AFE inverter inverter cabinet install resistance detector, it is separately installed control this equipment breaker, from
It exports lead-out wire on switching value point and gives frequency converter On-off signal to CUVC plate.
Step S2: connecting resistance detector power supply, and the alarming value of resistance detector is arranged, setting selection output switch parameter
Point.
Step S3: converter parameter change the switching value point of resistance detector, is set into parameter.
Step S4: installation motor speed encoder, motor encoder velocity feedback is to frequency converter.
Step S5: PLC given speed is compared with feedback speed, setting speed deviation and lag time.
S6: two kinds of signals of step carry out or operation, provide alarm F150.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of ground detecting method of converter oxygen gun Frequency Converter Control motor, which is characterized in that the ground detecting method is answered
For in a ground detecting system,
The ground detecting system includes: controller, frequency converter, speed encoder, resistance detector, the speed encoder with
The converter oxygen gun Frequency Converter Control motor connection, the frequency converter are connect with controller and the speed encoder, the electricity
Resistance detector is connect with the converter oxygen gun Frequency Converter Control motor and the frequency converter；
The ground detecting method includes:
The speed encoder detects the actual motion speed of the converter oxygen gun Frequency Converter Control motor, and the reality is transported
Scanning frequency degree is sent to the frequency converter；
The actual motion speed compared with the given speed that the controller is set, is judged that speed difference is by the frequency converter
It is no to be more than or equal to 3HZ；
Whether the resistance value that the resistance detector detects the winding of the converter oxygen gun Frequency Converter Control motor is less than or equal to
0.5K ohm；
It is more than or equal to 3HZ in the speed difference, and the duration is more than or equal to 0.5s or/and the resistance value is less than or equal to
At 0.5K ohm, determine that unidirectional ground connection occurs for the converter oxygen gun Frequency Converter Control motor.
2. ground detecting method as described in claim 1, which is characterized in that determining converter oxygen gun Frequency Converter Control motor hair
After raw unidirectional ground connection, the method also includes:
Generate an alarm signal.
3. ground detecting method as described in claim 1, which is characterized in that determining converter oxygen gun Frequency Converter Control motor hair
After raw unidirectional ground connection, the method also includes:
Generate a prompt information.
4. ground detecting method as described in claim 1, which is characterized in that determining converter oxygen gun Frequency Converter Control motor hair
After raw unidirectional ground connection, the method also includes:
Generate control converter oxygen gun Frequency Converter Control motor signal out of service.
5. ground detecting method as described in claim 1, which is characterized in that the resistance detector detects the converter oxygen gun
Whether the resistance value of the winding of Frequency Converter Control motor, which is less than or equal to 0.5K ohm, is detected the converter in the speed encoder
It is executed before the actual motion speed of oxygen rifle Frequency Converter Control motor, or detects the converter oxygen gun with the speed encoder
The actual motion speed of Frequency Converter Control motor is performed simultaneously.
6. ground detecting method as described in claim 1, which is characterized in that the resistance detector detects the converter oxygen gun
Whether the resistance value of the winding of Frequency Converter Control motor is less than or equal to 0.5K ohm in the frequency converter for actual motion speed
Degree with the given speed that the controller set compared with before execution, or with the frequency converter by the actual motion speed and
The given speed of the controller setting is relatively performed simultaneously.
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| CN201710557183.0A CN107561439B (en) | 2017-07-10 | 2017-07-10 | A kind of ground detecting method of converter oxygen gun Frequency Converter Control motor |
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| CN201710557183.0A CN107561439B (en) | 2017-07-10 | 2017-07-10 | A kind of ground detecting method of converter oxygen gun Frequency Converter Control motor |
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| CN108153289A (en) * | 2018-01-15 | 2018-06-12 | 宁波精成车业有限公司 | Driver performs the test method and circuit of mechanical action lag time difference |
| CN110684879A (en) * | 2019-10-29 | 2020-01-14 | 首钢京唐钢铁联合有限责任公司 | Method and device for preventing oxygen lance from falling |
| CN112322829B (en) * | 2020-10-12 | 2022-07-15 | 首钢京唐钢铁联合有限责任公司 | Method and system for detecting grounding of motor winding of oxygen lance of steel converter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194571A (en) * | 2013-04-11 | 2013-07-10 | 莱芜钢铁集团有限公司 | Automatic calibration device for converter oxygen lance encoder |
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| JP2012135171A (en) * | 2010-12-24 | 2012-07-12 | Toyota Motor Corp | Rotary electric machine drive system |
| CN103589821B (en) * | 2013-11-29 | 2015-08-12 | 北京金自天正智能控制股份有限公司 | A kind of method automatically controlled for oxygen lance for steel-making converter lifting |
| CN105907918B (en) * | 2016-07-05 | 2017-11-07 | 中冶赛迪电气技术有限公司 | A kind of control system and method for improving converter oxygen lance safe operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103194571A (en) * | 2013-04-11 | 2013-07-10 | 莱芜钢铁集团有限公司 | Automatic calibration device for converter oxygen lance encoder |
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