CN108736448A - A kind of MKB motors accident alarming processing method - Google Patents
A kind of MKB motors accident alarming processing method Download PDFInfo
- Publication number
- CN108736448A CN108736448A CN201810611681.3A CN201810611681A CN108736448A CN 108736448 A CN108736448 A CN 108736448A CN 201810611681 A CN201810611681 A CN 201810611681A CN 108736448 A CN108736448 A CN 108736448A
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- China
- Prior art keywords
- negative
- current
- sequence current
- motor
- mkb
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
A kind of MKB motors accident alarming processing method, including：When MKB contactors disconnect, judge whether to generate negative-sequence current；If non-negative sequence current generates, motor accident alarming is sent；If generating negative-sequence current, the modulus value to generating negative-sequence current judges；If the modulus value of the negative-sequence current is less than or equal to setting value, motor accident alarming is sent；If the modulus value of the negative-sequence current is greater than the set value, sends motor accident alarming and start spare motor.The present invention is by calculating disconnected instantaneous negative-sequence current mutually all the way, and then whether judging the generation of disconnected phase, the problem of to solve the disconnected phase of previous either motor circuit or MKB dead electricity, all send out motor trouble-signal warning operations staff at once, and start spare motor.
Description
Technical field
The present invention relates to electric control fields, and in particular to a kind of MKB motors accident alarming processing method is used for MKB equipment
Motor thus alarm when troubleshooting.
Background technology
With the extensive use of motor protection product, user is higher and higher to the performance requirement of product, more and more finely
Change.Either motor circuit was disconnected mutually or MKB dead electricity in the past, all sends out motor trouble-signal at once, starts spare motor simultaneously
Warn operations staff.But actually MKB dead electricity need not start spare motor, need to only alarm to operations staff, operating personnel
Can slightly it alleviate except the accident.
Will produce larger negative-sequence current when phase occurs to break for motor, thus negative-sequence current can be used as disconnected mutually generation according to
According to, and in the producing cause of negative-sequence current, it is only mutually one of which to break, and is possible to generate when three-phase system asymmetry negative
Sequence electric current, and the asymmetric reason of three-phase system is caused to have very much, wherein harmonic wave is most commonly seen one kind.When operation of power networks
When in journey including a large amount of harmonic wave, so that three-phase current is distorted, so that three-phase electricity after harmonic wave interacts with fundamental wave
Rheology obtains generation that is asymmetric, and then also having negative-sequence current.In MKB protection systems, sends out motor trouble-signal at it and arrive
Before accident circuit cuts off circuit by it, actuation time is about 30ms~60ms, therefore, only need to be accurate within its actuation time
Collect and can determine whether by the disconnected negative-sequence current mutually generated, the alarm be due to electrical fault generates or due to because of MKB certainly
What body dead electricity generated.
Invention content
In view of the above-mentioned problems, the invention discloses a kind of MKB motors accident alarming processing methods, including：When control and protect
When protecting device for switching disconnection, judge whether to generate negative-sequence current；If non-negative sequence current generates, motor accident alarming is not sent；
If generating negative-sequence current, the modulus value to generating negative-sequence current judges；If the modulus value of the negative-sequence current is less than or equal to set
Definite value then sends motor accident alarming；If the modulus value of the negative-sequence current is greater than the set value, sends motor accident alarming and open
Move spare motor.
Further, described to judge whether that generating negative-sequence current includes：It is acquired close to motor side by current transformer
Three-phase current；According to the collected three-phase current of the current transformer, calculated using symmetrical component method each in power grid at this time
The negative-sequence current of phase.
Further, the setting value is：
Wherein, IsFor setting value, i1For the transient current in broken phase current mutual inductor primary coil, I2、I3For when the disconnected phase of generation
When other two-phase phase currents, zdFor current transformer primary impedance, a is middle operator.
The present invention solves the disconnected phase of previous either motor circuit or MKB dead electricity, all sends out motor accident letter at once
Number warning operations staff, and the problem of start spare motor.Actually MKB dead electricity when need not start spare motor, only need
It alarms to operations staff, operating personnel can slightly be alleviated except the accident.
Description of the drawings
By reading the detailed description of following detailed description, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of specific implementation mode, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is MKB control system composition schematic diagrams.
Fig. 2 is that the control process of the present invention is intended to.
Specific implementation mode
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened completely is communicated to those skilled in the art.
The invention discloses a kind of MKB motors accident alarming processing methods, pass through negative phase-sequence in power grid before being disconnected to short-circuiting device
The analysis of electric current, to judge that contactor disconnects reason, when being judged as causing MKB electric cabinets to send out electricity due to MKB dead electricity itself
When machine fault alarm, control method control MKB electric cabinets do not carry out start-up operation to spare motor through the invention；When being judged as
When due to occurring disconnected phase situation in power grid, control MKB electric cabinets send out motor fault warning by the method for the invention at this time, and lead to
It crosses the control of MKB electric cabinets and starts spare motor.Specifically, the control method of the present invention includes：When MKB contactors disconnect, sentence
It is disconnected whether to generate negative-sequence current；If non-negative sequence current generates, motor accident alarming is sent；If generating negative-sequence current, to production
The modulus value of raw negative-sequence current is judged；If the modulus value of the negative-sequence current is less than or equal to setting value, motor accident report is sent
It is alert；If the modulus value of the negative-sequence current is greater than the set value, sends motor accident alarming and start spare motor.It will pass through below
Attached drawing is illustrated the present invention.
As shown in Figure 1, be MKB control system composition schematic diagrams, including motor, current transformer, MKB electric cabinets and
Corresponding control power grid.Wherein, the MKB electric cabinets include：Current transformer interface, X1, X2 and X3 control interface.Its
In, current transformer is used to acquire the three-phase current in the control power grid, and is input to by the current transformer interface
It is preserved and is handled in MKB electric cabinets；The X2 control interfaces are for inputting programming Control, by by MKB motors of the present invention
Accident alarming processing method is converted to corresponding control program, is input in MKB electric cabinets by programmable input terminal, to real
The transmission of existing corresponding signal and the control of relevant device；The X1 control interfaces are controlled for open circuit protection comprising contact
Device state, contactor coil state, trouble-signal and run signal.Wherein, contactor coil state is used for determining program control
State (such as whether executing contactor disconnection action) processed；Contactor state for checking contactor current state, can by with connect
Tentaculum coil state is used to judge the action failure of contactor together；Trouble-signal state is used to show the generation of trouble-signal；
Remote operation signal starts or stops for remote control equipment and (such as controls spare motor to start or stop).
As shown in Fig. 2, the control process for the present invention is intended to.When the contactor being connected to the motor disconnects (i.e. motor trips)
When, judge whether its instantaneous negative-sequence current is greater than the set value, if the instantaneous value of the negative-sequence current is greater than the set value, keeps
The negative sequence current signal generates state, and by carrying out "AND" logical operation with motor tripped condition, result phase is described
Phase situation of breaking is generated in MKB control systems；If the instantaneous value of the negative-sequence current is less than or equal to setting value, negative phase-sequence electricity is released
Road generates state, to judge that MKB control systems are happened without disconnected phase at this time.When there is disconnected phase signals state, MKB is automatically controlled
Case controls by the remote control interface in its X1 control interface starting or stoping for relevant device and (such as controls spare motor
Startup).The specific method is as follows by the present invention：
When MKB contactors disconnect, judge whether to generate negative-sequence current；If non-negative sequence current generates, motor is not sent
Accident alarming；If generating negative-sequence current, the modulus value to generating negative-sequence current judges；If the modulus value of the negative-sequence current is small
In setting value, then motor accident alarming is sent；If the modulus value of the negative-sequence current is more than or equal to setting value, motor accident is sent
It alarms and starts spare motor.The present invention acquires the three-phase current close to motor side by current transformer first；Then root
According to the collected three-phase current of the current transformer, the negative-sequence current of each phase in power grid at this time is calculated using symmetrical component method.
Wherein, negative-sequence current is caused since asymmetrical three-phase situation occurring in three phase network, in symmetrical components computational methods,
By following relationship：
Wherein,For A, B, C three-phase phase current in three phase network,This Wei at this time three
Zero-sequence current component, forward-order current component and the negative-sequence current component of phase power grid, formula 2 can be obtained by formula 1：
When disconnected phase occurs in three phase network, if disconnected phase occurs for A phases, thenEqual to 0, basis at this time：
It can obtain,
But the present invention acquires A phase currents by current transformer in practice, the Current Mutual Inductance when phase occurs to break for A phase currents
Primary coil is inductance in device, then will produce inverse electromotive force and be added in primary coil both ends, so that primary coil generates induced current,
The induced current is equivalent to the phase current instead of A phases at this timeSo that still can be examined in the secondary coil of current transformer
Electric current is measured, therefore, negative-sequence current at this time should be：
Wherein, IsFor setting value, i1For disconnected phase transient current, I2、I3For other two-phase phase currents, z when disconnected phase occursdFor
Current transformer primary impedance, a are middle operator.
The present invention is by IsAs the threshold value of negative-sequence current, it is more than I when being generated in the three phase networksNegative-sequence current, and with
After be in contact device disconnection, i.e., motor trip when, that is, think in three phase network at this time occur break phase.To generate electrical fault report
It is alert, and spare motor is started by the control of MKB electric cabinets, to be powered by backup network.Otherwise, then motor is only sent
Failure alarm signal.
Wherein, middle operator a can by three phase network disconnected phase when zero-sequence current component, forward-order current component, zero sequence
Current component is obtained with corresponding three-phase current by the relationship of formula 1 or formula 2.
More than, illustrative specific implementation mode only of the invention, but scope of protection of the present invention is not limited thereto, appoints
What those familiar with the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in, all
It is covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (3)
1. a kind of MKB motors accident alarming processing method, which is characterized in that including：
When MKB contactors disconnect, judge whether to generate negative-sequence current；
If non-negative sequence current generates, motor accident alarming is not sent；
If generating negative-sequence current, the modulus value to generating negative-sequence current judges；
If the modulus value of the negative-sequence current is less than or equal to setting value, motor accident alarming is sent；
If the modulus value of the negative-sequence current is greater than the set value, sends motor accident alarming and start spare motor.
2. MKB motors accident alarming processing method according to claim 1, which is characterized in that described to judge whether to generate
Negative-sequence current includes：
The three-phase current close to motor side is acquired by current transformer；
According to the collected three-phase current of the current transformer, the negative phase-sequence of each phase in power grid at this time is calculated using symmetrical component method
Electric current.
3. MKB motors accident alarming processing method according to claim 1, which is characterized in that the setting value is：
Wherein, IsFor setting value, i1For the transient current in broken phase current mutual inductor primary coil, I2、I3For when occur break phase when its
Its biphase current, zdFor current transformer primary impedance, a is middle operator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810611681.3A CN108736448A (en) | 2018-06-14 | 2018-06-14 | A kind of MKB motors accident alarming processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810611681.3A CN108736448A (en) | 2018-06-14 | 2018-06-14 | A kind of MKB motors accident alarming processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108736448A true CN108736448A (en) | 2018-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810611681.3A Pending CN108736448A (en) | 2018-06-14 | 2018-06-14 | A kind of MKB motors accident alarming processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922485A (en) * | 2021-08-31 | 2022-01-11 | 中国核电工程有限公司 | Relay protection configuration system capable of responding to nuclear power plant priority power supply phase failure |
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| CN103762568A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Negative-sequence current split-phase differential motion protecting method for electric transmission line |
| CN103823126A (en) * | 2014-03-04 | 2014-05-28 | 中国神华能源股份有限公司 | Method and system for monitoring three-phase current unbalance |
| CN105633912A (en) * | 2016-03-03 | 2016-06-01 | 南京南瑞继保电气有限公司 | Optical transformer-based internal asymmetric fault protection method for generator |
| CN105897092A (en) * | 2016-04-27 | 2016-08-24 | 青岛大学 | Design method for achieving single-phase operation of star-connection three-phase asynchronous generator |
| CN106291352A (en) * | 2015-05-26 | 2017-01-04 | 江森自控空调冷冻设备(无锡)有限公司 | Electrical fault detection method and device and electrical fault protect system |
-
2018
- 2018-06-14 CN CN201810611681.3A patent/CN108736448A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762568A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Negative-sequence current split-phase differential motion protecting method for electric transmission line |
| CN103823126A (en) * | 2014-03-04 | 2014-05-28 | 中国神华能源股份有限公司 | Method and system for monitoring three-phase current unbalance |
| CN106291352A (en) * | 2015-05-26 | 2017-01-04 | 江森自控空调冷冻设备(无锡)有限公司 | Electrical fault detection method and device and electrical fault protect system |
| CN105633912A (en) * | 2016-03-03 | 2016-06-01 | 南京南瑞继保电气有限公司 | Optical transformer-based internal asymmetric fault protection method for generator |
| CN105897092A (en) * | 2016-04-27 | 2016-08-24 | 青岛大学 | Design method for achieving single-phase operation of star-connection three-phase asynchronous generator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922485A (en) * | 2021-08-31 | 2022-01-11 | 中国核电工程有限公司 | Relay protection configuration system capable of responding to nuclear power plant priority power supply phase failure |
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Application publication date: 20181102 |
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