CN211123115U - Motor slot insulation electric field impact evaluation device - Google Patents
Motor slot insulation electric field impact evaluation device Download PDFInfo
- Publication number
- CN211123115U CN211123115U CN201921096554.0U CN201921096554U CN211123115U CN 211123115 U CN211123115 U CN 211123115U CN 201921096554 U CN201921096554 U CN 201921096554U CN 211123115 U CN211123115 U CN 211123115U
- Authority
- CN
- China
- Prior art keywords
- electric field
- impact
- motor
- insulation
- slot insulation
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a motor groove insulation electric field strikes evaluation method and evaluation device belongs to motor groove insulation safety and assesses technical field, can not assess the harm that the strong electric field caused to the motor groove insulation in advance among the solution prior art, diagnoses insulation fault's hidden danger point to avoid the motor to cause its inside groove insulation damage and induce insulation accident scheduling problem under the electric field impact that the overvoltage formed. The utility model discloses establish motor groove insulation electric field impact assessment model based on field analysis; performing field path analysis based on the obtained test sample to obtain a motor slot insulation fault identification sample; and evaluating the impact of the motor slot insulation electric field based on the established motor slot insulation electric field impact evaluation model, and performing motor slot insulation safety early warning according to an evaluation result. The utility model discloses collection module: the system is used for acquiring test samples and real-time monitoring data; an A/D converter: the analog-to-digital conversion device is used for performing analog-to-digital conversion on the test sample and the real-time monitoring data; a single chip microcomputer: the data processing and uploading device is used for processing and uploading the data converted by the A/D converter; a microcomputer: the system is used for constructing and storing an impact evaluation model of the motor slot insulation electric field, receiving real-time data uploaded by the single chip microcomputer to perform field and path analysis calculation, and evaluating the impact of the motor slot insulation electric field; an alarm module: and carrying out motor slot insulation safety early warning according to the evaluation result.
Description
Technical Field
The invention relates to the technical field of motor slot insulation safety evaluation, in particular to a motor slot insulation electric field impact evaluation method and an evaluation device.
Background
Under the vigorous promotion of the thirteen-five plan in China, more and more large motors are put into the operation of a power grid at present. With the increase of the voltage level of the power grid, the harmfulness of the overvoltage is more obvious. The motor easily causes insulation damage of an inner groove thereof under the impact of an electric field formed by overvoltage, induces insulation accidents, and directly influences industrial production and transportation safety.
The problem of motor insulation safety under the action of overvoltage is studied at home and abroad, and the overvoltage process is approximately simulated by adopting the wave impedance and the wave speed of a motor winding, so that the overvoltage distribution on the motor winding is calculated and analyzed. The damage degree of the strong electric field to the insulation impact of the motor slot is evaluated, the hidden danger point of the insulation fault of the motor slot is diagnosed, and the improvement of the safe operation level and the predictive maintenance capability of the large motor is necessary. Therefore, a method and a device for evaluating the impact of the insulation electric field of the motor slot are sought to solve the problems.
Disclosure of Invention
The invention aims to provide a motor slot insulation electric field impact evaluation method and an evaluation device.
The purpose of the invention is realized by the following technical scheme.
A motor slot insulation electric field impact assessment method and an assessment device comprise the following contents:
(1) establishing a motor slot insulation electric field impact evaluation model: the method comprises an impact electric field characteristic quantity, a slot insulation electric field impact synthesis characteristic quantity, a slot insulation state comprehensive characteristic vector and a slot insulation electric field impact evaluation fuzzy recognition mode.
The impact electric field characteristic quantity consists of an impact electric field amplitude characteristic quantity and an impact electric field time characteristic quantity, and is constructed according to the following steps:
(a) characteristic quantity of amplitude of impact electric field: the characteristic of the amplitude of the impact electric field characterizes the relativity relationship between the electric field intensity inside the insulating medium and the dielectric strength of the insulating medium,
Eimax(t) is the maximum impact electric field intensity value in the insulation medium in the ith limited unit in the stator slot of the motor at the moment t; eiα being the dielectric strength of the insulating medium in the ith finite elementtiReflecting the maximum impact electric field intensity of the slot section at the time t and the breakdown field intensity E of the insulating mediumiThe magnitude relationship of (c).
(b) Time characteristic quantity of impact electric field: the time characteristic quantity of the impact electric field represents the exciting effect of the impact process of the impact electric field on the breakdown of the insulating medium,
Eimax(tk) And Eimax(tk-1) Respectively during the impact process tkAnd tk-1Instantaneous, maximum impact electric field strength value in the insulating medium in the ith finite element βtiAnd reflecting the impact change of the maximum field intensity in the insulating medium, and representing the impact time characteristic of the electric field.
The slot insulation electric field impact synthesis characteristic quantity is a comprehensive effect of representing an impact electric field to slot insulation. The characteristic quantity of the slot insulation electric field impact synthesis is composed of the characteristic quantity of the impact electric field and the partial discharge quantity q of the slot insulationtThe method comprises the following steps:
γti＝qt/(kaiαti+kbiβti) (3)
γtisynthesizing characteristic quantity for slot insulation electric field impact of the ith unit in the stator slot; k is a radical ofai，kbiSet of electric field impact factors, k, for the ith cellai，kbiImpact factor is determined by experimentAnd after the simulation calculation is obtained, the simulation calculation is prestored in a computer memory.
A fuzzy recognition mode for slot insulation electric field impact evaluation: comparing slot insulation electric field impact resultant characteristic quantities on M insulation medium units of the stator slot section p (x, y), and obtaining the maximum electric field impact resultant characteristic quantity on the stator slot section
mtp＝max{γt1，γt2，γt3，...，γti，...，γtM} (4)
Carrying out N times of plane subdivision on the No. z groove body, and solving the maximum electric field impact synthesis characteristic quantity in the stator groove
mtz＝max{mt1，mt2，mt3，...mtj，...mtN} (5)
Simultaneously calculating the sum of the maximum electric field impact synthesis characteristic quantities in the groove
Because the impact electric field causes the partial discharge of the stator slot, the slot insulation state is monitored to obtain the slot partial discharge quantity Q (t) in the electric field impact process formed by the overvoltage, and a slot insulation state comprehensive characteristic vector w comprehensively reflecting the slot insulation state is formedtz，
wtz＝[Mtz，mtz，Q(t)](7)
The motor stator has n stator slots, and the slot insulation state comprehensive characteristic vectors form n fuzzy sets
Identifying samples with the slot insulation fault according to the near selection principle of the fuzzy pattern identification method
And (3) carrying out proximity calculation to realize impact evaluation of the insulation electric field of the motor slot:
evaluating the damage degree of the motor to insulation in the electric field impact process formed by overvoltage by using the calculated value of fuzzy pattern recognition, and obtaining the maximum insulation safety evaluation value WMgzLocating the stator slot number with the largest impact of the electric field and diagnosing the insulation fault area.
The motor slot insulation electric field impact evaluation model is pre-stored in a hard disk of a computer by a program module after being programmed by the computer, so as to form a motor slot insulation state identification and fault diagnosis program.
(2) Constructing a motor slot insulation fault identification sample: the slot insulation fault identification sample set comprises impact factors k introduced into slot insulation electric field impact synthesis characteristic quantityai，kbi。
The impact action degree of overvoltage on the insulation of the stator slot of the motor is influenced by factors such as the strength, the gradient and the distribution of an impact electric field in the stator slot, an insulation medium in the slot and the like, and an impact factor k is introduced into the slot insulation electric field impact synthesis characteristic quantityai，kbi. Insulation fault identification sample set (comprising k)ai，kbi) The method is characterized in that the method is obtained by combining field test and numerical simulation according to the following steps:
(a) under the action of the impulse voltage G (t), the waveform of a motor port G (t) and the partial discharge quantity Q (t) of the stator slot are monitored, and an insulation state characteristic quantity test sample is collected.
(b) According to the test data, under the action of G (t), calculating the impact electric field and the impact factor k in the motor groove by adopting a finite element methodai，kbi. Considering the combined effect of the impact electric field, for a series of impact voltages G1(t)，G2(t)，...，Gn(t)]Experiment, calculated using big data
Logarithm sign
Method for solving impact factor k by mathematical statisticsaiAll are the same asTheorem asking kbi。
(c) And (3) carrying out overvoltage impact test on the motor to obtain the measured data of the insulation state:
after the field calculation processing of big data, a slot insulation state comprehensive characteristic vector sample set is obtained,
acquiring a motor slot insulation fault identification sample from the slot insulation state comprehensive characteristic vector sample set,
(3) and monitoring the overvoltage G (t) waveform and the partial discharge quantity Q (t) of the stator slot of the motor port in real time. A capacitive voltage divider and a detection coil element are selected as sensing elements for acquiring impact overvoltage and partial discharge signals. In order to ensure the real-time performance of the sampling rate, an analog-to-digital conversion A/D chip (ADS931) with the conversion rate of 30MHz is selected, multiple paths of signals are sent to the analog-to-digital conversion A/D chip (ADS931), and the tasks of signal sampling, signal storage and signal uploading to a microcomputer are completed by real-time sampling software of a single chip microcomputer.
(4) And (4) realizing a slot insulation electric field impact evaluation algorithm. The whole software system consists of a real-time sampling module, a field path analyzing and calculating module, a motor slot insulation electric field impact evaluation module and an early warning module, and is stored in a hard disk of a microcomputer. The whole software system is realized by adopting VC + + programming, finite element calculation programs and database technologies under the support of a Windows operating system.
(5) The evaluation device comprises a hardware part (a capacitive voltage divider, a detection coil, an analog-digital conversion circuit, a single chip microcomputer circuit, a signal transmission circuit and a microcomputer) and a software part (a real-time sampling program, a field path analysis and calculation program, a motor slot insulation electric field impact evaluation program and an early warning program).
Drawings
FIG. 1 is a schematic flow diagram of one embodiment of the present invention.
Fig. 2 is a circuit diagram of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
FIG. 1 shows a method and an apparatus for evaluating the impact of an insulation electric field of a motor slot, which are disclosed by the invention, and the method comprises the following steps:
establishing a motor slot insulation electric field impact evaluation model: the method comprises an impact electric field characteristic quantity, a slot insulation electric field impact synthesis characteristic quantity, a slot insulation state comprehensive characteristic vector and a slot insulation electric field impact evaluation fuzzy recognition mode.
Constructing a motor slot insulation fault identification sample: the slot insulation fault identification sample set comprises impact factors k introduced into slot insulation electric field impact synthesis characteristic quantityai，kbi。
And monitoring the overvoltage G (t) waveform and the partial discharge quantity Q (t) of the stator slot of the motor port in real time. A capacitive voltage divider and a detection coil element are selected as sensing elements for acquiring impact overvoltage and partial discharge signals. In order to ensure the real-time performance of the sampling rate, an analog-to-digital conversion A/D chip (ADS931) with the conversion rate of 30MHz is selected, multiple paths of signals are sent to the A/D chip (ADS931), and the tasks of signal sampling, signal storage and signal uploading to a microcomputer are completed by real-time sampling software of a single chip microcomputer.
And (4) realizing a slot insulation electric field impact evaluation algorithm. The software system consists of a real-time sampling module, a field path analyzing and calculating module, a motor slot insulation electric field impact evaluation module and an early warning module, and is stored in a hard disk of a microcomputer. The whole software system is realized by adopting VC + + programming, finite element calculation programs and database technologies under the support of a Windows operating system.
Fig. 2 is a circuit diagram of an embodiment of the present invention. In fig. 2, 1 is a power grid bus, 2 is a power transformer, 3 is a motor inlet bus, 4 is a large motor, 5 is a stator notch detection coil, 6 is a capacitive voltage divider, 7 is an analog-to-digital (A/D) converter, and 8 is a single acquisition signalThe chip machine 10 is a microcomputer, 9 is a computer data transmission line, 11 is a display of image data, 12 is a printer for outputting image data, and 13 is an alarm. The impact evaluation process of the motor slot insulation electric field: (1) establishing a motor slot insulation electric field impact evaluation model: according to the related technical data of the motor, an impact electric field characteristic quantity, a slot insulation electric field impact synthesis characteristic quantity, a slot insulation state comprehensive characteristic vector and a slot insulation electric field impact evaluation fuzzy recognition mode are constructed, converted into an insulation state fault diagnosis module and stored in a microcomputer. Constructing a motor slot insulation fault identification sample: according to field test and numerical simulation results, a comprehensive characteristic vector sample set of the insulation state of the slot is obtained through big data processing, and an insulation fault identification sample and k of the motor slot are determinedai，kbiAnd stored in the microcomputer with the identified sample parameters. (3) Monitoring overvoltage G (t) waveform and partial discharge quantity Q (t) of a stator slot of a motor port in real time: the voltage wave transmitted from the power grid bus 1 is transmitted to a port 3 of a large motor 4 through a power transformer 2, is divided by capacitors C1 and C2 of a capacitive voltage divider 6, a voltage signal acquired by the capacitor C2 enters an A/D analog-to-digital converter 7 (model ADS931), high-speed analog-to-digital conversion is performed by the ADS931, meanwhile, a slot insulation local discharge amount signal detected by a stator slot detection coil enters the A/D analog-to-digital converter 7 (model ADS931), high-speed analog-to-digital conversion is performed by the ADS931, data of the electric signals after conversion by the A/D analog-to-digital converter enter a single chip microcomputer 8 (model AT89C51), and then the single chip microcomputer 8 uploads the data to a microcomputer 10 through a data transmission line 9 for real-time data storage and data processing. (4) And (3) realizing a slot insulation electric field impact evaluation algorithm, and evaluating the damage degree of an impact electric field formed by overvoltage to slot insulation: the microcomputer 10 runs a field path analysis calculation program and a motor slot insulation state identification and fault diagnosis program pre-stored in a hard disk, evaluates the impact degree of a motor stator slot insulation electric field, diagnoses a motor stator slot insulation accident area and a fault hidden danger point according to the calculation result of the evaluation and analysis, inputs the diagnosis result into a display 11 and a printer 12, and transmits an out-of-limit alarm instruction to an alarm 13 to complete the out-of-limit alarm task of the electric field impact.
Claims (2)
1. An electric motor slot insulation electric field impact evaluation device, comprising:
an acquisition module: the system is used for acquiring test samples and real-time monitoring data;
an A/D converter: the analog-to-digital conversion device is used for performing analog-to-digital conversion on the test sample and the real-time monitoring data;
a single chip microcomputer: the data processing and uploading device is used for processing and uploading the data converted by the A/D converter;
a microcomputer: the system is used for constructing and storing an impact evaluation model of the motor slot insulation electric field, receiving real-time data uploaded by the single chip microcomputer to perform field and path analysis calculation, and evaluating the impact of the motor slot insulation electric field;
an alarm module: and carrying out motor slot insulation safety early warning according to the evaluation result.
2. The motor slot insulation electric field impact evaluation device of claim 1, further characterized in that the a/D converter is of type ADS 931;
the type of the single chip microcomputer is AT89C 51;
the alarm module comprises a display, a printer and an alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096554.0U CN211123115U (en) | 2019-07-12 | 2019-07-12 | Motor slot insulation electric field impact evaluation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096554.0U CN211123115U (en) | 2019-07-12 | 2019-07-12 | Motor slot insulation electric field impact evaluation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211123115U true CN211123115U (en) | 2020-07-28 |
Family
ID=71700445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921096554.0U Expired - Fee Related CN211123115U (en) | 2019-07-12 | 2019-07-12 | Motor slot insulation electric field impact evaluation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211123115U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231553A (en) * | 2019-07-12 | 2019-09-13 | 电子科技大学 | A kind of motor slot insulation electric field impact appraisal procedure and assessment device |
-
2019
- 2019-07-12 CN CN201921096554.0U patent/CN211123115U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231553A (en) * | 2019-07-12 | 2019-09-13 | 电子科技大学 | A kind of motor slot insulation electric field impact appraisal procedure and assessment device |
| CN110231553B (en) * | 2019-07-12 | 2024-04-09 | 电子科技大学 | Motor slot insulation electric field impact evaluation method and evaluation device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nurmanova et al. | A new transformer FRA measurement technique to reach smart interpretation for inter-disk faults | |
| CN106841949B (en) | Method and device for monitoring stator insulation of three-phase asynchronous alternating current motor on line | |
| CN112766342A (en) | Abnormity detection method for electrical equipment | |
| CN114252749B (en) | Transformer partial discharge detection method and device based on multiple sensors | |
| CN112557966A (en) | Transformer winding looseness identification method based on local mean decomposition and support vector machine | |
| CN103884943A (en) | Method for comprehensively analyzing and diagnosing deformation of winding of transformer | |
| CN114325403B (en) | Lithium ion battery life detection method and system based on electrochemical impedance spectrum test | |
| Pandarakone et al. | Frequency spectrum investigation and analytical diagnosis method for turn-to-turn short-circuit insulation failure in stator winding of low voltage induction motor | |
| CN115877205A (en) | Intelligent fault diagnosis system and method for servo motor | |
| CN211123115U (en) | Motor slot insulation electric field impact evaluation device | |
| Bejaoui et al. | A data-driven prognostics technique and rul prediction of rotating machines using an exponential degradation model | |
| CN103821750B (en) | A kind of ventilator stall based on electric current and surge monitoring and diagnostic method | |
| CN116520068B (en) | Diagnostic method, device, equipment and storage medium for electric power data | |
| CN110703043B (en) | Electricity testing method and device for nondestructive testing of multi-type power transmission line | |
| CN110231553B (en) | Motor slot insulation electric field impact evaluation method and evaluation device | |
| CN115343579B (en) | Power grid fault analysis method and device and electronic equipment | |
| CN110929673A (en) | Transformer winding vibration signal identification method based on ITD (inverse discrete cosine transformation) permutation entropy and CGWO-SVM (Carrier-support vector machine) | |
| CN115128345A (en) | Power grid safety early warning method and system based on harmonic monitoring | |
| CN112729531B (en) | Fault studying and judging method and system for distribution transformer equipment | |
| CN115218777A (en) | Method and system for detecting deformation of transformer winding based on leakage magnetic field distribution | |
| CN109357751B (en) | Power transformer winding looseness defect detection system | |
| CN111352365B (en) | Dustproof ventilation type electric power and electrical equipment cabinet and control method | |
| CN110501154B (en) | GIS equipment fault detection and positioning method based on MOSVR and boxplot analysis | |
| CN112098066A (en) | High-voltage shunt reactor fault diagnosis method and system based on gate control circulation unit | |
| CN112526220A (en) | Test apparatus, test method, computer device, and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200728 Termination date: 20210712 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |