CN112444745B - Method and device for judging loss of magnetization fault of phase-change camera caused by pulse loss - Google Patents
Method and device for judging loss of magnetization fault of phase-change camera caused by pulse loss Download PDFInfo
- Publication number
- CN112444745B CN112444745B CN201910825018.8A CN201910825018A CN112444745B CN 112444745 B CN112444745 B CN 112444745B CN 201910825018 A CN201910825018 A CN 201910825018A CN 112444745 B CN112444745 B CN 112444745B
- Authority
- CN
- China
- Prior art keywords
- loss
- phase
- exciting transformer
- current
- fault
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000005415 magnetization Effects 0.000 title claims abstract description 24
- 101150055297 SET1 gene Proteins 0.000 claims abstract description 22
- 101100042371 Caenorhabditis elegans set-3 gene Proteins 0.000 claims abstract description 14
- 101150117538 Set2 gene Proteins 0.000 claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 13
- 101150104646 SET4 gene Proteins 0.000 claims abstract description 10
- 230000005389 magnetism Effects 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Protection Of Transformers (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a judging method of loss of excitation fault of a phase-change modulator caused by pulse loss.A protection device measures exciting transformer current and exciting current; and calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer. The fundamental wave amplitude of a certain phase of current of the exciting transformer exceeds a threshold value I set1, and the loss of the magnetic protection function is instantly input; further carrying out protection logic discrimination: if the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2 and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer fails to perform the excitation failure, and tripping after time delay t set; when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the loss of the magnetic protection function exits after the time delay t set1. The invention also provides a corresponding distinguishing device. The method can improve the sensitivity of detecting the loss of magnetization faults caused by pulse loss.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a method and a device for judging loss of magnetism of a phase-change modulator caused by pulse loss by using exciting transformer current.
Background
The novel synchronous camera has the characteristics of stable operation, strong fault ride-through capability, quick dynamic response and the like, and is applied to a large scale in a direct current converter station. The loss of magnetism of the phase-change machine under the grid-connected operation working condition is generated, and for a large-scale non-salient pole phase-change machine, the loss of magnetism of the phase-change machine is not dangerous to the phase-change machine, and the damage is mainly caused by the fact that the system voltage is reduced due to the fact that a quite large reactive power difference occurs, if the reactive power reserve of the system is insufficient, the stable operation of the system is possibly damaged, and therefore the loss of magnetism protection needs to be configured.
The excitation system is abnormal, so that pulse is lost, and the excitation system is a common loss-of-magnetic fault type. The existing loss-of-excitation fault judging method generally adopts combination judgment of low voltage at the machine end or low voltage of the system, reverse reactive power, low excitation voltage and the like. The method can judge the loss of excitation fault only after the excitation current is reduced to a certain degree. Because the excitation current is slow in falling time, the sensitivity of the conventional judging method is low, so that a quick judging method for the loss of the excitation fault of the phase-change modulator is necessary to be researched.
Disclosure of Invention
The main purpose of the invention is as follows: the method and the device for judging the loss of magnetization fault of the phase-change regulator caused by pulse loss are provided, so that the problem of low sensitivity of the conventional judging method is solved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a discrimination method for loss of magnetization fault of a phase-change modulator caused by pulse loss comprises the following steps:
Step 1: the protection device collects the current of the exciting transformer;
step 2: respectively calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer;
step 3: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
Further, the exciting transformer current in the step 1 is the high-voltage side or low-voltage side current of the exciting transformer.
Further, after the step 2 and before the step 3, the method further comprises:
Step 30: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value I set1, the loss of the magnetic protection function is put into operation.
Further, after the step 3, the method further comprises:
step 4: when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the loss of the magnetic protection function exits after the time delay t set1.
Further, the step 3 further includes that after the loss of magnetic field of the camera is determined, the protection device acts on tripping after a set delay t set.
Further, in the step 1, the exciting transformer current collected by the protection device is taken from an exciting transformer current transformer.
Further, the fundamental wave amplitude of the exciting transformer current is calculated by adopting a Fourier algorithm, and the direct current component is calculated by adopting an average value algorithm.
The invention correspondingly provides a judging device for loss of magnetization faults of a phase-change modulator caused by pulse loss, which comprises:
the acquisition unit is used for acquiring the current of the exciting transformer;
A calculation unit: the method is used for calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer;
discrimination unit: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
Further, the exciting transformer current in the acquisition unit is the high-voltage side or low-voltage side current of the exciting transformer.
Further, the apparatus further comprises:
and a throw-in unit: the method is used for switching on the loss of the magnetic protection function when the fundamental wave amplitude of a certain phase of current of the exciting transformer exceeds a threshold value I set1.
Further, the apparatus further comprises:
Protection exit unit: when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the loss magnetic protection function is withdrawn after the time delay t set1.
Further, the judging unit further comprises a step of tripping the protection device after the judgment of the loss of magnetic field of the camera is performed through a set time delay t set.
Further, the exciting transformer current of the acquisition unit is taken from an exciting transformer current transformer.
The beneficial effects of the invention are as follows: the existing loss of magnetic fault judging method has low sensitivity, and the loss of magnetic fault of the phase-change regulator can be rapidly and effectively judged by using the current of the exciting transformer, and the quick disconnection and shutdown can be realized.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for discriminating loss of field faults of a phase-change modulator caused by pulse loss in the present invention;
FIG. 2 is a flowchart of an embodiment of a method for determining loss of field of a phase-change modulator caused by a loss of pulse according to the present invention;
FIG. 3 is a flowchart of an embodiment of a method for determining loss of field of a phase-change modulator caused by pulse loss according to the present invention;
FIG. 4 is a computer-implemented flowchart of a method for determining loss of field of a camera due to loss of pulses in accordance with the present invention;
Fig. 5 is a diagram of a primary wiring diagram of a phase shifter protection, wherein the exciting transformer current measured by the protection device is taken from the exciting transformer current transformer.
In the figure, I max is the maximum phase fundamental component in three-phase current of an exciting transformer A, B, C, I set1 is the loss of excitation protection criterion input threshold value, I dcmax is the maximum phase amplitude of the direct current component of the exciting transformer, I set2 is the direct current component threshold value, I set3 is the fundamental wave content threshold value, I set4 is the fundamental wave component protection exit threshold value, t set1 is the protection exit time delay, and t set is the protection action time delay.
Detailed Description
Embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1:
The method for judging the loss of magnetization fault of the phase-change modulator caused by the loss of pulses shown in fig. 1 comprises the following steps:
S101: the protection device collects the current of the exciting transformer; the exciting transformer current is the high-voltage side current or the low-voltage side current of the exciting transformer. The exciting transformer current is taken from the exciting transformer current transformer. As shown in fig. 4, the high-voltage side or low-voltage side current of the exciting transformer of the camera passes through the current transformer and is connected to the protection device, and the protection device measures the high-voltage side or low-voltage side current of the exciting transformer.
S102: and respectively calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer.
S103: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
Example 2:
the method for judging the loss of magnetization fault of the phase-change modulator caused by the loss of pulses as shown in fig. 2 comprises the following steps:
s201: the protection device collects the current of the exciting transformer; the exciting transformer current is the high-voltage side current or the low-voltage side current of the exciting transformer.
S202: and respectively calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer.
S203: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value I set1, the loss of the magnetic protection function is put into operation.
S204: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
Example 3:
the method for judging the loss of magnetization fault of the phase-change modulator caused by the loss of pulses shown in fig. 3 comprises the following steps:
S301: the protection device collects the current of the exciting transformer; the exciting transformer current is the high-voltage side current or the low-voltage side current of the exciting transformer.
S302: and respectively calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer.
S303: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value I set1, the loss of the magnetic protection function is put into operation.
S3043: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
S305: when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the loss of the magnetic protection function exits after the time delay t set1.
Fig. 4 is a flowchart showing a computer-implemented method for determining loss of field of a phase-change modulator caused by pulse loss according to the present invention.
In a preferred embodiment, the protection device is operated to trip after the loss of the magnetization fault of the dimmer is determined by the above embodiments 1 to 3, and a set time delay t set is passed.
In a preferred embodiment, on the basis of the above embodiments 1 to 3, the fundamental amplitude of the exciting transformer current is calculated by using a fourier algorithm, and the direct current component is calculated by using an average algorithm.
Specifically, the fundamental component of the exciting transformer current is calculated by adopting a Fourier algorithm, and the direct current component is calculated by adopting an average algorithm.
(1) Fundamental component of exciting transformer current
The fundamental component is calculated by adopting a full-cycle Fourier algorithm, and the calculation formula is as follows:
N is the number of sampling points of each power frequency period of the protection device, I φ (k) is the current sampling value of the high-voltage side or the low-voltage side of the exciting transformer, I φ.Re,Iφ.Im is the real part and the imaginary part of the fundamental wave phasor of the current of the high-voltage side or the low-voltage side of the exciting transformer, and I φ.AM is the fundamental wave amplitude of the current of the high-voltage side or the low-voltage side of the exciting transformer. Phi is a, B and C, which respectively represent A phase, B phase and C phase. I max is the maximum phase fundamental component of the three-phase current of the excitation transformer A, B, C, and the max () function represents the maximum value.
(2) DC component of exciting transformer current
The dc component is calculated using an average algorithm.
Wherein, N is the sampling point number of each power frequency period of the protection device, I a(k)、ib(k)、ic (k) is the sampling value of the high-voltage side or low-voltage side A phase, B phase and C phase currents of the exciting transformer, I adc,Ibdc,Icdc is the average value of the high-voltage side or low-voltage side A phase currents, the average value of the B phase currents and the average value of the C phase currents of the exciting transformer, I dcmax is the largest phase direct current component in the three-phase currents of the exciting transformer A, B, C, and the max () function represents taking the maximum value.
(3) Partial loss of magnetic field for phase-adjusting device the fault discrimination is realized as follows:
1) Fundamental wave amplitude of current of one phase of exciting transformer exceeds threshold I set1 to protect input
I max>Iset1 (3)
Wherein I set1 is the threshold value of loss of magnetic protection criterion input, generally 5% -30% of I Tn is adopted, and I Tn is the secondary rated current of the exciting transformer.
2) The DC component of a certain phase current of the exciting transformer exceeds a threshold value I set2
I dcmax>Iset2 (4)
Wherein, I set2 is a direct current component threshold value, and generally 10-70% of I Tn is adopted.
3) Fundamental wave amplitude values of three-phase currents of exciting transformer are smaller than threshold value I set3
I max<Iset3 (5)
Wherein, I set3 is the fundamental wave content threshold value, and generally takes 3% -5%I Tn.
4) The fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set4 and the protection delay t set1 exits
I max<Iset4 (6)
Wherein I set4 is a fundamental wave content threshold value, 1% -2% of I Tn.tset1 is taken as protection exit delay, and t set1＝tset +Δt is taken as 1s.
Example 4:
A discrimination device for loss of magnetization fault of a phase-change modulator caused by pulse loss comprises: the device comprises an acquisition unit, a calculation unit and a discrimination unit. Wherein:
The acquisition unit: the method is used for collecting the exciting transformer current. The exciting transformer current is the high-voltage side current or the low-voltage side current of the exciting transformer.
A calculation unit: the method is used for calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer.
Discrimination unit: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
Example 5:
A discrimination device for loss of magnetization fault of a phase-change modulator caused by pulse loss comprises: the device comprises an acquisition unit, a calculation unit, a investment unit and a discrimination unit. Wherein:
The acquisition unit: the method is used for collecting the exciting transformer current. The exciting transformer current is the high-voltage side current or the low-voltage side current of the exciting transformer.
A calculation unit: the method is used for calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer.
And a throw-in unit: the method is used for switching on the loss of the magnetic protection function when the fundamental wave amplitude of a certain phase of current of the exciting transformer exceeds a threshold value I set1.
Discrimination unit: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, the exciting transformer is judged to be a loss-of-excitation fault of the phase-adjusting device, and the protection device acts on tripping after set time delay t set.
Example 6:
A discrimination device for loss of magnetization fault of a phase-change modulator caused by pulse loss comprises: the device comprises an acquisition unit, a calculation unit, a throwing unit, a discrimination unit and a protection exit unit. Wherein:
The acquisition unit: the method is used for collecting the exciting transformer current. The exciting transformer current is the high-voltage side current or the low-voltage side current of the exciting transformer.
A calculation unit: the method is used for calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer.
And a throw-in unit: the method is used for switching on the loss of the magnetic protection function when the fundamental wave amplitude of a certain phase of current of the exciting transformer exceeds a threshold value I set1.
Discrimination unit: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, the exciting transformer is judged to be a loss-of-excitation fault of the phase-adjusting device, and the protection device acts on tripping after set time delay t set.
Protection exit unit: when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the embodiment described above is merely illustrative of the technical idea of the present invention after the loss of the magnetic protection function is delayed by t set1, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (13)
1. A judging method of loss of magnetization fault of a phase-change modulator caused by pulse loss is characterized by comprising the following steps:
Step 1: the protection device collects the current of the exciting transformer;
step 2: respectively calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer;
step 3: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
2. The method for determining loss of excitation fault of phase-change camera caused by pulse loss as claimed in claim 1, wherein said exciting transformer current in step 1 is exciting transformer high-voltage side or low-voltage side current.
3. The method for determining loss of magnetization fault of phase-change modulator caused by pulse loss as set forth in claim 1, further comprising, after said step 2 and before said step 3:
Step 30: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value I set1, the loss of the magnetic protection function is put into operation.
4. The method for determining loss of magnetization fault of phase-change modulator caused by pulse loss as set forth in claim 3, further comprising, after said step 3:
step 4: when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the loss of the magnetic protection function exits after the time delay t set1.
5. The method for distinguishing the loss of magnetization fault of the phase-change modulator caused by pulse loss as set forth in claim 1, wherein the method comprises the following steps: and 3, after judging that the loss of magnetic field of the camera is a fault, the protection device acts on tripping after a set delay t set.
6. The method for discriminating loss of magnetization fault of phase-change modulator caused by pulse loss according to claim 1, wherein: in the step 1, the exciting transformer current collected by the protection device is taken from an exciting transformer current transformer.
7. The method for discriminating loss of magnetization fault of phase-change modulator caused by pulse loss according to claim 1, wherein: the fundamental wave amplitude of the exciting transformer current is calculated by adopting a Fourier algorithm, and the direct current component is calculated by adopting an average value algorithm.
8. A discriminating device for loss of magnetization fault of a phase-change modulator caused by pulse loss is characterized by comprising:
the acquisition unit is used for acquiring the current of the exciting transformer;
A calculation unit: the method is used for calculating the amplitude value and the direct current component of the three-phase current fundamental wave of the exciting transformer;
discrimination unit: when the direct current component of a certain phase current of the exciting transformer exceeds a threshold value I set2, and the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value I set3, judging that the exciting transformer has a loss of magnetism fault.
9. The apparatus for determining loss of excitation fault of phase-change camera due to pulse loss as defined in claim 8, wherein the exciting transformer current in said collecting unit is exciting transformer high-voltage side or low-voltage side current.
10. The apparatus for discriminating a loss of magnetization fault of a phase-change modulator caused by a loss of pulse according to claim 8, further comprising:
and a throw-in unit: the method is used for switching on the loss of the magnetic protection function when the fundamental wave amplitude of a certain phase of current of the exciting transformer exceeds a threshold value I set1.
11. The apparatus for discriminating a loss of magnetization fault of a phase-change modulator caused by a loss of pulse according to claim 9, further comprising:
Protection exit unit: when the fundamental wave amplitudes of the three-phase currents of the exciting transformer are smaller than the threshold value I set4, the loss magnetic protection function is withdrawn after the time delay t set1.
12. The apparatus for discriminating loss of magnetization fault of a phase-change modulator caused by pulse loss according to claim 8, wherein: the judging unit further comprises a step of tripping the protection device after the judgment of the loss of magnetic field of the camera is carried out through a set time delay t set.
13. The apparatus for discriminating a loss of magnetization failure of a phase-change modulator caused by a loss of pulse according to claim 8 wherein: the exciting transformer current of the acquisition unit is taken from an exciting transformer current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910825018.8A CN112444745B (en) | 2019-09-03 | 2019-09-03 | Method and device for judging loss of magnetization fault of phase-change camera caused by pulse loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910825018.8A CN112444745B (en) | 2019-09-03 | 2019-09-03 | Method and device for judging loss of magnetization fault of phase-change camera caused by pulse loss |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112444745A CN112444745A (en) | 2021-03-05 |
| CN112444745B true CN112444745B (en) | 2024-09-20 |
Family
ID=74734815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910825018.8A Active CN112444745B (en) | 2019-09-03 | 2019-09-03 | Method and device for judging loss of magnetization fault of phase-change camera caused by pulse loss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112444745B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200348B (en) * | 2021-12-06 | 2023-07-04 | 云南电网有限责任公司保山供电局 | Circuit tripping judgment method and system for stability control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1053207A1 (en) * | 1982-01-20 | 1983-11-07 | Ленинградское Отделение Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука | Method of field-loss protection of synchronous machine |
| JP2009077464A (en) * | 2007-09-18 | 2009-04-09 | Denso Corp | Field-winding type synchronous machine |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100985B (en) * | 1985-04-01 | 1986-08-13 | 核工业部电机运行技术开发公司 | Dynamo step out protector |
| CN101588153B (en) * | 2009-07-08 | 2011-05-04 | 浙江省电力公司 | Method of limiting low excitation |
| CN103490398B (en) * | 2013-10-17 | 2015-02-18 | 南车株洲电力机车研究所有限公司 | Direct axis current protection method and device for PMSM (permanent magnet synchronous motor) transmission system |
| CN103558547B (en) * | 2013-11-01 | 2015-12-02 | 东南大学 | A kind of intelligent failure diagnosis method of permagnetic synchronous motor |
| CN103926533B (en) * | 2014-03-24 | 2016-09-07 | 河海大学 | Permagnetic synchronous motor loss of excitation on-line fault diagnosis method and system |
| CN107765076B (en) * | 2016-08-19 | 2021-01-15 | 中国电力科学研究院 | Magnetizing inrush current identification method and device |
| CN106099859A (en) * | 2016-08-31 | 2016-11-09 | 汤鸣招 | Self-exciter quick field loss protection device |
| CN107707093B (en) * | 2017-10-18 | 2019-04-12 | 华中科技大学 | A kind of pouring-in vernier reluctance motor of current harmonics and system |
| CN108134373B (en) * | 2017-12-28 | 2019-12-24 | 长园深瑞继保自动化有限公司 | Voltage-regulating compensation transformer excitation inrush current locking method |
| CN108594143A (en) * | 2018-01-16 | 2018-09-28 | 宁德师范学院 | A kind of permanent magnet synchronous motor demagnetization method for diagnosing faults |
| CN108736444B (en) * | 2018-04-16 | 2021-08-24 | 中国电力科学研究院有限公司 | Phase modulator field loss protection method and system |
| CN109038494B (en) * | 2018-08-16 | 2019-10-22 | 国电南瑞科技股份有限公司 | Phase modifier field loss protection excitation low-voltage judgment method |
| CN110061475B (en) * | 2019-03-22 | 2022-10-11 | 中国电力科学研究院有限公司 | Phase modulator loss-of-field protection method and system based on influence degree on system |
| CN110061474B (en) * | 2019-04-16 | 2021-05-14 | 华南理工大学 | Method for identifying and preventing transformer differential protection action caused by sympathetic inrush current |
-
2019
- 2019-09-03 CN CN201910825018.8A patent/CN112444745B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1053207A1 (en) * | 1982-01-20 | 1983-11-07 | Ленинградское Отделение Всесоюзного Ордена Ленина Проектно-Изыскательского И Научно-Исследовательского Института "Гидропроект" Им.С.Я.Жука | Method of field-loss protection of synchronous machine |
| JP2009077464A (en) * | 2007-09-18 | 2009-04-09 | Denso Corp | Field-winding type synchronous machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112444745A (en) | 2021-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101118375B1 (en) | Apparatus for swift determination of fault in electric power system | |
| RU2550152C1 (en) | System and method of protection of electric power system | |
| WO2016173312A1 (en) | Method and apparatus for identifying open phase of circuit breaker on basis of voltage | |
| CN108493907A (en) | A kind of Amplitude Comparison guard method of adaptation active power distribution network | |
| CN109617026B (en) | Ultrahigh-speed protection method for earth fault of direct-current power grid converter station | |
| CN101651328B (en) | Method and device for shunt reactor turn-to-turn protection | |
| EP2645516A1 (en) | Islanding detection in electricity distribution network | |
| CN112952890B (en) | Short-circuit protection method and device for bridge arm reactor of flexible direct-current power transmission system | |
| CN112710931B (en) | Method and system for detecting earth leakage current of secondary side long-distance cable pair of alternating current system | |
| CN101741095A (en) | Automatic switching device for economic operation of power transformer | |
| Liu et al. | Protection of microgrids with high amounts of renewables: Challenges and solutions | |
| US20210035764A1 (en) | Earth leakage circuit breaker | |
| CN110794340B (en) | Disconnection protection method and circuit for high-voltage overhead line | |
| CN112444745B (en) | Method and device for judging loss of magnetization fault of phase-change camera caused by pulse loss | |
| CN109387724B (en) | Fault diagnosis method for synchronous phase modulator based on longitudinal analysis and transverse correction | |
| CN111146773A (en) | Single-phase earth fault self-healing method for small current grounding system | |
| Saleh et al. | Detecting Arcing Current Faults in Medium-to-Low Voltage Transformers | |
| Sahoo et al. | Understanding the sympathetic inrush phenomenon in the power network using transformer explorer | |
| CN112731211A (en) | Grounding transformer low-voltage winding turn-to-turn short circuit fault and phase identification method | |
| CN112968423A (en) | Overcurrent protection method for protecting turn-to-turn short circuit fault of low-voltage winding of grounding transformer | |
| CN108627795B (en) | Method and device for monitoring open circuit of voltage transformer in measuring circuit of power equipment | |
| CN100362718C (en) | Fault-tolerant complex judging self adaption high voltage parallel reactor turn-to-turn protection | |
| Zheng et al. | Protection algorithm for a wind turbine generator based on positive-and negative-sequence fault components | |
| CN101650391B (en) | Method and device for detecting oscillation of electrical systems | |
| Hamouda et al. | Numerical differential protection algorithm for power transformers |
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 |