CN109245049A - A kind of AC excitation synchronous electric motor rotor winding overcurrent protection method and device - Google Patents
A kind of AC excitation synchronous electric motor rotor winding overcurrent protection method and device Download PDFInfo
- Publication number
- CN109245049A CN109245049A CN201811343374.8A CN201811343374A CN109245049A CN 109245049 A CN109245049 A CN 109245049A CN 201811343374 A CN201811343374 A CN 201811343374A CN 109245049 A CN109245049 A CN 109245049A
- Authority
- CN
- China
- Prior art keywords
- square
- current
- overcurrent protection
- wave signal
- rotor winding
- 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.)
- Granted
Links
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
- H02H7/085—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 against excessive load
-
- 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
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
Landscapes
- Protection Of Generators And Motors (AREA)
Abstract
The present invention discloses a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method and device, method and step are as follows: (1) accessing the rotor windings three-phase current signal of motor, sampling obtains instantaneous current value；(2) overcurrent differentiation is carried out to instantaneous current value, generates the square-wave signal of characterization instantaneous overcurrent state；(3) duty ratio that previous step generates square-wave signal is calculated；(4) counting processing is carried out to protection delay counter: if any square-wave signal is high level; or the duty ratio of any square-wave signal is greater than threshold; accumulated counts then are carried out to delay counter; otherwise carry out regressive counting; when being added to delay counter value greater than delay definite value, overcurrent protection movement.This method is based on current instantaneous value and carries out logic discrimination, and protection calculation amount is small, and GPF (General Protection False method is not present because acting inherent delay caused by phasor computing algorithm, and avoid the error of trouble duration judgement, being capable of fast and reliable reflection rotor-side short trouble.
Description
Technical field
The present invention relates to main electrical equipment Protection Technology more particularly to a kind of rotor of AC excitation synchronous motor around
Group overcurrent protection method and device.
Background technique
In AC excitation synchronous motor, the voltage and current in excitation winding is the AC compounent of frequency variation, no
Different with Current Voltage phase between phase, it is therefore possible to phase fault occurs.When phase fault occurs, excitation winding event
Barrier is met by comparing big electric current, and high current generates high temperature inside unit, can cause to damage to unit, it is therefore desirable to be directed to
Excitation winding phase-to phase fault increases overcurrent protection.
Traditional overcurrent protection, under power frequency operation operating condition, generally by fourier algorithm calculating current virtual value, then
Check whether the virtual value is more than protection definite value to determine whether to break down；Under converting operation operating condition, such as water-storage machine
In group shutdown process, it is general using frequency-tracking combination fourier algorithm or whole wave integral algorithm come calculating current virtual value,
Carry out overcurrent discrimination.Above method is all fault component to be calculated according to complete cycle wave number evidence, therefore only occur in failure
After one cycle, accurate fault component can be just calculated.In power frequency or close to power frequency application scenarios, the algorithm of a few tens of milliseconds
Period cuts off failure in time and does not have too much influence.But for the electric fault of low-frequency operation equipment, complete cycle wave
The time for calculating fault component needs is very long, and the delay time error of GPF (General Protection False method is very big, extends the mute time of failure, no
Conducive to the safe operation of equipment.
AC excitation synchronous motor is a kind of special synchronous motor, by the amplitude, the frequency that adjust excitation side Current Voltage
Rate, phase come realize unit active power and reactive power decoupling adjust.AC excitation synchronous electric motor rotor side electrical frequency
Variation range is wider, includes low frequency operating condition.For example, generally being required using the speed change pump-storage generator of AC excitation technology
Excitation frequency is in ﹣ 0.1fn~﹢ 0.1fn(fnFor unit rated frequency) variation, lowest operating frequency are even up in range
0.1Hz, if using traditional over-current protection method, only failure amount calculate inherent delay just reach 10s, this greatly reduce after
Reaction speed of the electric protection equipment to short trouble.Therefore, it is necessary to guarantee protective relaying device in low frequency feelings using new method
Also excitation winding phase fault can be monitored quickly under condition and is cut off in time.
Summary of the invention
The object of the present invention is to propose a kind of AC excitation synchronous electric motor rotor winding overcurrent differentiated based on instantaneous value
Method and apparatus avoid GPF (General Protection False method because acting inherent delay error caused by phasor computing algorithm, in combination with instantaneous overcurrent
Period is detected in the accounting of total duration, further avoids the error of trouble duration judgement, so as to fast and reliable anti-
Reflect the rotor-side short trouble of AC excitation synchronous motor.
The technical scheme adopted by the invention is as follows a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method, packet
Include following steps:
(1) motor in real time rotor windings three-phase current signal；
(2) overcurrent differentiation is carried out to the instantaneous value of the rotor winding three-phase electric current acquired in real time respectively, generates every phase
Reflect the square-wave signal of instantaneous overcurrent state；
(3) the rotor winding current signal period is measured, a length of data window when taking the half in the period calculates square wave letter in real time
Duty ratio number in the data window, the i.e. ratio of high level state duration and data window；
(4) counting processing is carried out to protection delay counter: a certain moment, if any square-wave signal is high level, or step
Suddenly the duty ratio of (3) any square-wave signal is greater than threshold, then carries out accumulated counts to delay counter, otherwise carry out regressive meter
Number；
When delay counter value is greater than 0, overcurrent protection starting；
When being added to delay counter value greater than preset delay definite value, overcurrent protection movement；
When regressive to delay counter value is equal to or less than 0, overcurrent protection starting is returned.
Preferably, rotor winding three-phase electric current described in step (1), passes through electronic current mutual inductor or Hall
Current transformer collects.
Preferably, the generation method of square-wave signal described in step (2) is specifically, by rotor winding three-phase electric current
The absolute value of instantaneous value is compared with overcurrent protection definite value respectively, generates three square-wave signal Ra、Rb、Rc, calculation formula are as follows:
In formula, RxFor the square-wave signal of generation, separate x=a, b, c；ixFor a certain phase current values, separate x=a, b, c；iset
For overcurrent protection definite value.
Preferably, overcurrent protection definite value described in step (2) is rotor winding current maximum value when motor works normally
1.1~2 times.
Preferably, the measurement method in rotor current signal period described in step (3) uses zero crossing algorithm.
Preferably, the delay definite value of delay counter described in step (4) is 0.1s~10s.
The present invention proposes a kind of AC excitation synchronous electric motor rotor winding overcurrent protection simultaneously, including
Current acquisition module is used for motor in real time rotor windings three-phase current signal；
Current square wave generation module carries out respectively for the instantaneous value to the rotor winding three-phase electric current acquired in real time
Overcurrent differentiates, generates the square-wave signal of every phase reflection instantaneous overcurrent state；
Duty ratio computing module, for measuring the rotor winding current signal period, a length of data when taking the half in the period
Window calculates duty ratio of the square-wave signal in the data window, the i.e. ratio of high level state duration and data window in real time；
Logic judgment and decision-making module, for being calculated using protection delay counter according to current square-wave signal and duty ratio
The result of module carries out counting processing, and whether judgement and decision overcurrent protection need to start, movement or starting return；
Protection delay counter is carried out counting processing method particularly includes: a certain moment, if any square-wave signal is height
The duty ratio of any square-wave signal is greater than threshold in level or duty ratio computing module, then carries out cumulative meter to delay counter
Number, on the contrary carry out regressive counting；
When delay counter value is greater than 0, overcurrent protection starting；
When being added to delay counter value greater than preset delay definite value, overcurrent protection movement；
When regressive to delay counter value is equal to or less than 0, overcurrent protection starting is returned.
Preferably, the electric current of rotor winding three-phase described in current acquisition module, passes through electronic current mutual inductor
Or Hall current mutual inductor collects.
Preferably, the generation method of square-wave signal described in current square wave generation module is specifically, by rotor around
The absolute value of group three-phase current instantaneous value is compared with overcurrent protection definite value respectively, generates three square-wave signal Ra、Rb、Rc, meter
Calculate formula are as follows:
In formula, RxFor the square-wave signal of generation, separate x=a, b, c；ixFor a certain phase current values, separate x=a, b, c；iset
For overcurrent protection definite value.
Preferably, the measurement method in rotor current signal period described in duty ratio computing module is counted using zero passage
Method.
The utility model has the advantages that
This method be based on current instantaneous value carry out logic discrimination, protection calculation amount it is small, and there is no GPF (General Protection False method because
Inherent delay is acted caused by phasor computing algorithm；Accounting in conjunction with the instantaneous overcurrent period in total duration detects, low in current instantaneous value
In the time section of threshold, delay counter is protected still to be able to continuous accumulated counts, avoids trouble duration judgement
Error, so as to the rotor-side short trouble of fast and reliable reflection AC excitation synchronous motor.
Detailed description of the invention
Fig. 1 show speed change pump-storage generator and its rotor windings over-current protection system schematic diagram.
Fig. 2 is the flow diagram of the method for the present invention.
The relay protective scheme that Fig. 3 show the method for the present invention differentiates time diagram.
Specific embodiment
It is further illustrated below in conjunction with the drawings and specific embodiments.
Embodiment 1:
A kind of AC excitation synchronous electric motor rotor winding overcurrent protection method, includes the following steps:
S1: motor in real time rotor windings three-phase current signal；Rotor winding three-phase electric current passes through electronic type electricity
Current transformer or Hall current mutual inductor collect.
S2: overcurrent differentiation is carried out to the instantaneous value of the rotor winding three-phase electric current acquired in real time respectively, generates every phase
Reflect the square-wave signal of instantaneous overcurrent state；Method particularly includes: by the absolute value of rotor winding three-phase current instantaneous value point
It is not compared with overcurrent protection definite value, generates three square-wave signal Ra、Rb、Rc, calculation formula are as follows:
In formula, RxFor the square-wave signal of generation, separate x=a, b, c；ixFor a certain phase current values, separate x=a, b, c；iset
For overcurrent protection definite value, overcurrent protection definite value is 1.1 of rotor winding current maximum value when motor works normally in the present embodiment
~2 times.
S3: measurement rotor winding current signal period, a length of data window when taking the half in the period calculate square wave letter in real time
Duty ratio number in the data window, the i.e. ratio of high level state duration and data window；Rotor current in the present embodiment
The measurement method of signal period uses zero crossing algorithm.
S4: counting processing is carried out to protection delay counter: a certain moment, if any square-wave signal is high level, or step
Suddenly the duty ratio of (3) any square-wave signal is greater than threshold, then carries out accumulated counts to delay counter, otherwise carry out regressive meter
Number；
When delay counter value is greater than 0, overcurrent protection starting；
When being added to delay counter value greater than preset delay definite value, overcurrent protection movement；
When regressive to delay counter value is equal to or less than 0, overcurrent protection starting is returned.
The delay definite value of delay counter is 0.1s~10s in the present embodiment.
Embodiment 2:
The present embodiment protects system diagram as shown in Figure 1, unit is determined using AC excitation pump-storage generator as research object
Sub- side is connected through generator terminal breaker and phase-change switch with main transformer, and rotor-side AC excitation system power supply is derived from exciting transformer, defeated
Outlet is three-phase alternating current output, is connected with three-phase rotor windings.
Assuming that (0~t in Fig. 3 when working normally1(t1For the section 2s)) current effective valueAmplitude is
500A, power frequency 0.5Hz.(t in Fig. 3 wherein at a phase current zero crossing1Moment) alternate metallic short circuit event occurs
Barrier, the maximum value of fault current virtual valueAmplitude is 2000A.Protection definite value threshold is set as Iset=
1000A, duty ratio threshold definite value 56%, action delay definite value tzd=1.5s.Below with reference to the logic flow of published method of the present invention
Cheng Tu, as shown in Fig. 2, technical solution of the present invention is specifically introduced by step.All calculation processing steps are only with rotor
For failure of the current phase, the processing method and step of remaining two-phase are similar.
(1) rotor winding current signal is acquired, the current signal of certain failure phase is as shown in 1. channel waveform in Fig. 3.
(2) absolute value of rotor winding current sampled value is compared with overcurrent protection definite value, generates square-wave signal Rx
Calculation formula are as follows:
In formula, RxFor the square-wave signal of generation；ixFor instantaneous current value；isetFor overcurrent protection definite value, i.e. 1000A.
Above-mentioned calculation formula is indicated in Fig. 3, i.e., does two dotted lines for being parallel to horizontal axis in coordinate axial plane, and it is vertical
The intersection point of axis is respectively 1000A and -1000A, this positive and negative half-wave of two dotted lines and current waveform in each period has two respectively
A intersection point.When instantaneous current value is within this two dotted lines, square-wave signal is low level, when instantaneous current value is in this two void
When except line, square-wave signal is high level, and finally obtained square-wave signal is as shown in Fig. 3 2. channel waveform.
(3) period of rotor current signal is measured, it is 0.5Hz, period 2s that frequency measurement, which obtains current frequency, first.Take this week
The half duration of phase, i.e. 1s are data window, calculate duty ratio of the square-wave signal in the data window in real time, i.e. high level state is held
The ratio of continuous duration and data window.
It is accumulative go out current point before in 1s time section square-wave signal high level duration, can be obtained and account for divided by 1s
Empty ratio, is indicated with percentage.From t2(t2For 2.17s, similarly hereinafter) moment, duty ratio is gradually increasing by zero, until t3(t3For
2.83s, similarly hereinafter) moment reaches maximum value 66.7%, and then duty ratio remains unchanged substantially, until t4(t4For 8.17s, similarly hereinafter)
Moment starts to successively decrease again, arrives t5(t5For 8.83s, similarly hereinafter) moment is decreased to 0, as shown in Fig. 3 3. channel waveform.
(4) counting processing is carried out to protection delay counter: a certain moment, if square-wave signal is that high level or square wave are believed
Number duty ratio be greater than threshold, then to delay counter carry out accumulated counts, otherwise carry out regressive counting, when be added to delay meter
When number device value is greater than delay definite value, overcurrent protection movement.
In t2Before moment, square-wave signal is low level, and duty ratio is 0, is unsatisfactory for operating criterion, counter is not
It is counted；In t2~t3Period, square-wave signal are high level, meet operating criterion, counter accumulated counts；In t3Moment, though
Right square-wave signal switchs to low level by high level, but has been more than duty ratio threshold definite value since duty ratio has reached 66.7%
56%, therefore delay counter is protected still to count；In t7Moment (t7For 3.67s), cumulative counter is more than delay definite value tzd
(1.5s), protection act.The situation of change of subsequent protection delay counter is as shown in the 5. channel Fig. 3, corresponding protection act
Situation is as shown in the 6. channel of Fig. 3.
Embodiment 3:
A kind of AC excitation synchronous electric motor rotor winding overcurrent protection, including
Current acquisition module is used for motor in real time rotor windings three-phase current signal；
Current square wave generation module carries out respectively for the instantaneous value to the rotor winding three-phase electric current acquired in real time
Overcurrent differentiates, generates the square-wave signal of every phase reflection instantaneous overcurrent state；
Duty ratio computing module, for measuring the rotor winding current signal period, a length of data when taking the half in the period
Window calculates duty ratio of the square-wave signal in the data window, the i.e. ratio of high level state duration and data window in real time；
Logic judgment and decision-making module, for being calculated using protection delay counter according to current square-wave signal and duty ratio
The result of module carries out counting processing, and whether judgement and decision overcurrent protection need to start, movement or starting return；
Protection delay counter is carried out counting processing method particularly includes: a certain moment, if any square-wave signal is height
The duty ratio of any square-wave signal is greater than threshold in level or duty ratio computing module, then carries out cumulative meter to delay counter
Number, on the contrary carry out regressive counting；
When delay counter value is greater than 0, overcurrent protection starting；
When being added to delay counter value greater than preset delay definite value, overcurrent protection movement；
When regressive to delay counter value is equal to or less than 0, overcurrent protection starting is returned.
Wherein, the electric current of rotor winding three-phase described in current acquisition module, by electronic current mutual inductor or
Hall current mutual inductor collects.
Wherein, the generation method of square-wave signal described in current square wave generation module is specifically, by rotor winding
The absolute value of three-phase current instantaneous value is compared with overcurrent protection definite value respectively, generates three square-wave signal Ra、Rb、Rc, calculate
Formula are as follows:
In formula, RxFor the square-wave signal of generation, separate x=a, b, c；ixFor a certain phase current values, separate x=a, b, c；iset
For overcurrent protection definite value.
In the present embodiment, the measurement method in rotor current signal period described in duty ratio computing module uses zero crossing
Algorithm.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (10)
1. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method, characterized in that include the following steps:
(1) motor in real time rotor windings three-phase current signal；
(2) overcurrent differentiation is carried out to the instantaneous value of the rotor winding three-phase electric current acquired in real time respectively, generates every phase reflection
The square-wave signal of instantaneous overcurrent state；
(3) the rotor winding current signal period is measured, a length of data window when taking the half in the period calculates square-wave signal in real time and exists
Duty ratio in the data window, the i.e. ratio of high level state duration and data window；
(4) counting processing is carried out to protection delay counter: a certain moment, if any square-wave signal is high level or step (3)
The duty ratio of any square-wave signal is greater than threshold, then carries out accumulated counts to delay counter, otherwise carry out regressive counting；
When delay counter value is greater than 0, overcurrent protection starting；
When being added to delay counter value greater than preset delay definite value, overcurrent protection movement；
When regressive to delay counter value is equal to or less than 0, overcurrent protection starting is returned.
2. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method according to claim 1, characterized in that
Rotor winding three-phase electric current described in step (1) is acquired by electronic current mutual inductor or Hall current mutual inductor
It obtains.
3. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method according to claim 1, characterized in that
The generation method of square-wave signal described in step (2) is specifically, by the absolute value of rotor winding three-phase current instantaneous value
It is compared respectively with overcurrent protection definite value, generates three square-wave signal Ra、Rb、Rc, calculation formula are as follows:
In formula, RxFor the square-wave signal of generation, separate x=a, b, c；ixFor a certain phase current values, separate x=a, b, c；isetFor mistake
Stream protection definite value.
4. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method according to claim 3, characterized in that
Overcurrent protection definite value described in step (2) is 1.1~2 times of rotor winding current maximum value when motor works normally.
5. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method according to claim 1, characterized in that
The measurement method in rotor current signal period described in step (3) uses zero crossing algorithm.
6. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection method according to claim 1, characterized in that
The delay definite value of delay counter described in step (4) is 0.1s~10s.
7. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection, characterized in that including
Current acquisition module is used for motor in real time rotor windings three-phase current signal；
Current square wave generation module carries out overcurrent for the instantaneous value to the rotor winding three-phase electric current acquired in real time respectively
Differentiate, generates the square-wave signal of every phase reflection instantaneous overcurrent state；
Duty ratio computing module, for measuring the rotor winding current signal period, a length of data window, real when taking the half in the period
When calculate duty ratio of the square-wave signal in the data window, the i.e. ratio of high level state duration and data window；
Logic judgment and decision-making module, for utilizing protection delay counter according to current square-wave signal and duty ratio computing module
Result carry out counting processing, judgement and whether decision overcurrent protection needs to start, movement or starting return；
Protection delay counter is carried out counting processing method particularly includes: a certain moment, if any square-wave signal is high level,
Or the duty ratio of any square-wave signal is greater than threshold in duty ratio computing module, then carries out accumulated counts to delay counter, instead
Carry out regressive counting；
When delay counter value is greater than 0, overcurrent protection starting；
When being added to delay counter value greater than preset delay definite value, overcurrent protection movement；
When regressive to delay counter value is equal to or less than 0, overcurrent protection starting is returned.
8. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection according to claim 7, characterized in that
Rotor winding three-phase electric current described in current acquisition module passes through electronic current mutual inductor or Hall current mutual inductor
It collects.
9. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection according to claim 7, characterized in that
The generation method of square-wave signal described in current square wave generation module is specifically, by rotor winding three-phase current instantaneous value
Absolute value be compared respectively with overcurrent protection definite value, generate three square-wave signal Ra、Rb、Rc, calculation formula are as follows:
In formula, RxFor the square-wave signal of generation, separate x=a, b, c；ixFor a certain phase current values, separate x=a, b, c；isetFor mistake
Stream protection definite value.
10. a kind of AC excitation synchronous electric motor rotor winding overcurrent protection according to claim 7, feature
It is that the measurement method in rotor current signal period described in duty ratio computing module uses zero crossing algorithm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811343374.8A CN109245049B (en) | 2018-11-13 | 2018-11-13 | Over-current protection method and device for rotor winding of alternating-current excitation synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811343374.8A CN109245049B (en) | 2018-11-13 | 2018-11-13 | Over-current protection method and device for rotor winding of alternating-current excitation synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109245049A true CN109245049A (en) | 2019-01-18 |
| CN109245049B CN109245049B (en) | 2020-09-08 |
Family
ID=65078353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811343374.8A Active CN109245049B (en) | 2018-11-13 | 2018-11-13 | Over-current protection method and device for rotor winding of alternating-current excitation synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109245049B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600277A (en) * | 2020-05-21 | 2020-08-28 | 中国南方电网有限责任公司 | Delay calculation method applied to overcurrent protection |
| CN114079259A (en) * | 2020-08-12 | 2022-02-22 | 天津首瑞智能电气有限公司 | Protective device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337837A (en) * | 2009-05-18 | 2013-10-02 | 许昌永新电气股份有限公司 | Power supply circuit protective control method |
| CN103490396A (en) * | 2013-09-25 | 2014-01-01 | 无锡中星微电子有限公司 | Current limiting circuit |
| CN104821751A (en) * | 2015-03-31 | 2015-08-05 | 浙江新富凌电气股份有限公司 | Frequency converter rapid start-stop machine control system |
| CN105870874A (en) * | 2016-04-28 | 2016-08-17 | 上海斐讯数据通信技术有限公司 | Over-current protection circuit |
| CN106026010A (en) * | 2016-07-20 | 2016-10-12 | 合肥联信电源有限公司 | Over-current protection system for emergency power supply |
| CN107658852A (en) * | 2017-11-15 | 2018-02-02 | 南京南瑞继保电气有限公司 | A kind of guard method of AC excitation synchronous machinery excitation winding phase fault and system |
| CN108336718A (en) * | 2018-01-03 | 2018-07-27 | 广东美芝制冷设备有限公司 | Compressor current foldback circuit, compressor and air conditioner |
-
2018
- 2018-11-13 CN CN201811343374.8A patent/CN109245049B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337837A (en) * | 2009-05-18 | 2013-10-02 | 许昌永新电气股份有限公司 | Power supply circuit protective control method |
| CN103490396A (en) * | 2013-09-25 | 2014-01-01 | 无锡中星微电子有限公司 | Current limiting circuit |
| CN104821751A (en) * | 2015-03-31 | 2015-08-05 | 浙江新富凌电气股份有限公司 | Frequency converter rapid start-stop machine control system |
| CN105870874A (en) * | 2016-04-28 | 2016-08-17 | 上海斐讯数据通信技术有限公司 | Over-current protection circuit |
| CN106026010A (en) * | 2016-07-20 | 2016-10-12 | 合肥联信电源有限公司 | Over-current protection system for emergency power supply |
| CN107658852A (en) * | 2017-11-15 | 2018-02-02 | 南京南瑞继保电气有限公司 | A kind of guard method of AC excitation synchronous machinery excitation winding phase fault and system |
| CN108336718A (en) * | 2018-01-03 | 2018-07-27 | 广东美芝制冷设备有限公司 | Compressor current foldback circuit, compressor and air conditioner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600277A (en) * | 2020-05-21 | 2020-08-28 | 中国南方电网有限责任公司 | Delay calculation method applied to overcurrent protection |
| CN114079259A (en) * | 2020-08-12 | 2022-02-22 | 天津首瑞智能电气有限公司 | Protective device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109245049B (en) | 2020-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104795801B (en) | A kind of breaker non-three phase method of discrimination and device based on voltage | |
| CN110441641A (en) | A kind of small current earthing wire-selecting method and system based on Zero sequence DC component | |
| US9494635B2 (en) | Islanding detection in electricity distribution network | |
| EP2645517B1 (en) | Improvement for islanding detection reliability in electricity distribution network | |
| CA2911753A1 (en) | Methods and apparatus for detection of transient instability and out-of-step conditions by state deviation | |
| CN103795022B (en) | Fault current detecting circuit | |
| CN104578013B (en) | A kind of direction protection method of the power distribution network containing DFIG based on power frequency difference | |
| CN105140893A (en) | Differential protection current transformer (CT) saturation recognition method | |
| CN109245049A (en) | A kind of AC excitation synchronous electric motor rotor winding overcurrent protection method and device | |
| US10578653B2 (en) | Overexcitation protection for electric power system equipment | |
| CN107658852B (en) | A kind of guard method and system of AC excitation synchronous machinery excitation winding phase fault | |
| CN108983096A (en) | A kind of high-tension motor power determining method and measuring device | |
| Gardell et al. | Motor bus transfer applications issues and considerations | |
| CN111044901A (en) | Fault early warning method and system for double-mode shield machine | |
| CN110297183A (en) | A kind of synchronous capacitor rotor inter-turn short circuit method for diagnosing faults, device and storage medium | |
| CN110401225A (en) | The high voltage crossing control method of double-fed blower after consideration current transformer power constraint | |
| Zweigle et al. | Adding shaft angle measurement to generator protection and monitoring | |
| CN109672153A (en) | AC/DC interconnected system based on abc- α β variation exchanges differential protecting method | |
| D'Aversa et al. | Challenges and solutions of protecting variable speed drive motors | |
| CN104332968A (en) | Current differential protection method based on high voltage DC transmission line | |
| CN109510179A (en) | Split-phase damps the direct current cut-off device and method of MMC and AC circuit breaker cooperation | |
| CN109994989A (en) | A kind of guard method and system of the flexible direct current power grid based on dc circuit breaker | |
| CN103918175B (en) | For running the method and apparatus of synchronous motor | |
| Sanaye-Pasand et al. | Study, comparison and simulation of power system swing detection and prediction method | |
| CN114498586B (en) | Power grid current protection setting method and device for high-proportion fluctuating power supply |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |