CN107144787A - The generator insulating detection means and detection method of a kind of permanent-magnetic wind driven generator - Google Patents
The generator insulating detection means and detection method of a kind of permanent-magnetic wind driven generator Download PDFInfo
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- CN107144787A CN107144787A CN201710270394.6A CN201710270394A CN107144787A CN 107144787 A CN107144787 A CN 107144787A CN 201710270394 A CN201710270394 A CN 201710270394A CN 107144787 A CN107144787 A CN 107144787A
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- generator
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- wind driven
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- 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
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
Abstract
The invention discloses a kind of generator insulating detection means of permanent-magnetic wind driven generator, the generator insulating detection means includes：PLC, power supply, communication module, touch-screen, I/O modules, constant pressure source, voltmeter, ammeter, discharge resistance, fuse, over-pressure safety device, contactor, transmitter, auxiliary reclay, terminal box and temperature sensor; the generator insulating detection means is utilized under permanent-magnetic wind driven generator group low wind conditions; in the orderly closedown time; the automatic test for carrying out insulaion resistance, and by detecting the diagnosis that generator stator insulator resistance, polarization index, absorptance and trend curve are insulated.
Description
Technical field
The present invention relates to technical field of wind power, more particularly to the generator insulating detection means of permanent-magnetic wind driven generator and
Detection method.
Background technology
Permanent-magnetic wind driven generator as large-scale wind driven generator mainstream model, it is very high in occupation rate of market.Due to wind
The climatic environment that group of motors is worked has that day and night temperature is big, dust storm big, some areas high humidity, there is the spies such as dew condensation phenomenon
Point, these environmental factors all produce influence, and the maintenance that wind-driven generator is damaged to the insulation system of wind-driven generator
And lifting cost is with sufficiently expensive.
Due to the particularity of wind power generating set running environment, live on-line testing is very difficult.For regular maintenance prison
Survey, the basic method detected using manual stoppage.The insulaion resistance of generating set is measured using megameter, not only efficiency
Lowly, and also need to shut down detection, considerably increase the cost of O＆M.
At present, both at home and abroad for generating set state of insulation typically by：Shelf depreciation, dielectric dissipation factor, let out
What the characteristic value of dew electric current, insulaion resistance and device capacitances value was characterized.
Wherein Hunan Institute Of Engineering discloses Authorization Notice No.：CN204716470U patent《One kind is online with insulation
The MW class wind turbine of monitoring function》, the patent is mainly installs ozone sensor additional by the different parts in generator,
Detection ozone content determines intensity and the position of shelf depreciation, indirectly the state of insulation of reflection generator.
Nanjing Wind Power Technology Co., Ltd. discloses Authorization Notice No.：CN202441544U patent《One kind is with insulation
Detect the wind-driven generator of function》, the patent is also by installing ozone sensor additional.
Two above patent only has a certain effect to winding minor insulation defects detection, however shelf depreciation test can only between
It is reversed to reflect state of insulation.
It is desirable to thering is a kind of generator insulating detection means of permanent-magnetic wind driven generator and detection method to overcome or
At least mitigate the drawbacks described above of prior art.
The content of the invention
It is an object of the invention to provide the generator insulating detection means and detection method of a kind of permanent-magnetic wind driven generator,
Using under Wind turbines low wind conditions, in the orderly closedown time, the test of insulaion resistance is carried out automatically, and passes through detection generating electricity
The diagnosis that machine stator insulaion resistance, polarization index, absorptance and trend curve are insulated.
To achieve the above object, the present invention provides a kind of generator insulating detection means of permanent-magnetic wind driven generator, described
Generator insulating detection means includes：PLC, power supply, communication module, touch-screen, I/O modules, constant pressure source, voltmeter, electricity
Flow table, discharge resistance, fuse, over-pressure safety device, contactor, transmitter, auxiliary reclay, terminal box and TEMP
Device；Wherein, ammeter includes the first ammeter and the second ammeter, and transmitter includes voltage transmitter, current transducer and temperature
Spend transmitter, contactor include first contactor, second contactor and the 3rd contactor, PLC by connection respectively with communication
Module and touch-screen are attached, and communication module is attached by connection and the control system of permanent-magnetic wind driven generator group,
PLC is connected by backboard connection with I/O modules, and multiple output ends of I/O modules are entered with auxiliary reclay and contactor respectively
Row connection, PLC analog input end is by voltage transmitter and the secondary side joint of voltmeter, and PLC analog input end passes through electric current
Transmitter and the first ammeter and the secondary side joint of the second ammeter, PLC analog input end connect temperature by temperature transmitter
Sensor；Primary side after constant pressure source, fuse, the first ammeter and second contactor series connection with voltmeter is in parallel, voltage
Table two ends are in parallel with over-pressure safety device, and constant pressure source is connected in parallel to after the 3rd contactor, the second ammeter and discharge resistance series connection
Branch road, branch road one end of constant pressure source is connected by first contactor with generator unit stator binding post, and the other end connects with ground connection
Line terminals are connected.
Preferably, step-up transformer low voltage electric network side draw 220V electricity of the power supply from permanent-magnetic wind driven generator group
Source, 220V AC powers are provided for the constant pressure source, and the constant pressure source is the control system of the PLC, touch-screen, communication mould
Block, I/O modules, voltmeter, ammeter, contactor and auxiliary reclay provide 24V dc sources.
Preferably, the generator insulating detection means also includes hardware security catenary system and software security catenary system；Firmly
Contactor KM0 auxiliary normally-closed contact and contactor KM1 drive control circuit in series are formed locking by part safety chain system, soft
Part safety chain system is used to be periodically detected the run time of the control system, when the control system program run-time error or
More than the detection time limit, the control system carries out restarting processing.
Preferably, the constant pressure source is the DC constant voltage power supply of continuously adjustabe, the output rated voltage model of the constant pressure source
Enclose for 1kV~12kV, rated current scope is 50mA~1A.
Preferably, the discharge resistance is used to consume remaining electric charge in permanent-magnetic wind driven generator winding, the electric discharge electricity
The Standard resistance range of resistance is：10k Ω -100k Ω, power is more than or equal to 50 watts.
The present invention provides a kind of detection method of the generator insulating detection means of permanent-magnetic wind driven generator, including following step
Suddenly：
(1) permanent-magnetic wind driven generator is obtained by the PLC, communication device and permanent-magnetic wind driven generator set control system
Working condition, when permanent-magnetic wind driven generator group be in orderly closedown state or be again started up state for time more than the generator it is exhausted
When the detection time of edge detection means and PLC timer internals arrival detection cycle, start the generator insulating inspection
Survey device；
(2) when the startup time satisfaction of the generator insulating detection means is required, close contactor KM1 and simultaneously keep contact
Device KM2 and contactor KM3 is in open mode, generator unit stator voltage is measured by the voltmeter, when stator voltage is less than
During 600V, contactor KM3 is closed, generator unit stator residual charge is discharged using the discharge resistance, discharge time is big
In equal to 20 seconds, when first ammeter, which is measured, is less than 0.1A by the current value of the discharge resistance, postpone to break for 5 seconds
Open contactor KM3；
(3) after discharge process terminates, absorptance measurement pattern is selected according to working condition, contactor KM2 is connected and is generating electricity
Apply on machine stator and record the voltmeter and ammeter in the constant pressure source, pressure process respectively at 15 seconds and 60 seconds
Data, insulating resistance value when calculating respectively 15 seconds and 60 seconds, and calculate the absorptance of stator winding, according to scene
Actual temperature and humidity are normalized, using normalizing insulating resistance value and absorptance judges that Stator insulate
State；
(4) after discharge process terminates, polarization index measurement pattern is selected according to working condition, contactor KM2 is connected in hair
Apply on motor stator and record the voltmeter and ammeter in the constant pressure source, pressure process respectively 1 minute and 10 minutes
When data, insulating resistance value when calculating respectively 1 minute and 10 minutes, and calculate the polarization index of stator winding, according to
Live actual temperature and humidity are normalized, using normalizing insulating resistance value and polarization index judges that generating set is determined
Insulating sublayer state；
(5) by continuously detecting calculating, the absorptance of generator unit stator winding is recorded, generator stator insulator is drawn and inhales
Receipts compare curve；By continuously detecting calculating, the polarization index of generator unit stator winding is recorded, generator stator insulator pole is drawn
Change exponential curve, and record in the memory cell of the PLC, the instruction PLC single measurements are finished；
(6) after single measurement is finished, contactor KM2 is disconnected first, contactor KM3 is connected afterwards, carries out generator windings
Remaining capacity discharges, and when voltmeter measurement voltage is less than 50V, disconnects contactor KM3 and contactor KM1, system enters
Self-clocking program is detected next time, and the PLC sends a signal to the control system of permanent-magnetic wind driven generator group, generator insulating
Detection is finished.
The present invention proposes the generator insulating detection means and detection method of a kind of permanent-magnetic wind driven generator, of the invention
The generator insulating detection means of permanent-magnetic wind driven generator is arranged on the stator outlet terminal and earth terminal of permanent magnetism wind turbine power generation machine
At son, the generator insulating detection means carries out insulaion resistance automatically in the low wind speed of Wind turbines and in the orderly closedown time
Test, using the present invention generator insulating detection means measurement insulaion resistance can not only carry out work on the spot environment
Normalized, and the polarization index and absorptance of insulation can be counted, and pass through insulaion resistance, absorptance and polarization index
Trend curve reflect generator insulation Long-term change trend, the state of insulation to determine generator, formulate maintenance and safeguard meter
Draw, significantly improve the O＆M efficiency of Wind turbines, reduce O＆M cost.
Brief description of the drawings
Fig. 1 is the structural representation of the generator insulating detection means of permanent-magnetic wind driven generator.
Fig. 2 is schematic diagram inside the switch board of the generator insulating detection means of permanent-magnetic wind driven generator.
Embodiment
To make the purpose, technical scheme and advantage of the invention implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from beginning to end or class
As label represent same or similar element or the element with same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.The embodiments described below with reference to the accompanying drawings are exemplary, it is intended to uses
It is of the invention in explaining, and be not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.Under
Embodiments of the invention are described in detail with reference to accompanying drawing for face.
As illustrated in fig. 1 and 2, the generator insulating detection means of permanent-magnetic wind driven generator include detection switch board, terminal box,
Temperature sensor, wherein detection switch board includes：PLC, power supply, communication module, touch-screen, I/O modules, constant pressure source, electricity
Press table, ammeter, discharge resistance, fuse, over-pressure safety device, contactor, transmitter and auxiliary reclay.
In control system, PLC is connected by connection with communication module and touch-screen, and communication module passes through connection and wind
The control system of power generator group is connected, and PLC is connected by backboard connection with I/O modules, multiple output ends of I/O modules
Auxiliary reclay is connected with contactor respectively, and PLC analog input ends are connected by voltage transmitter with voltmeter secondary side,
PLC analog input ends are connected by current transducer with ammeter 1 and the secondary side of ammeter 2, and PLC analog input ends pass through temperature
Degree transmitter is connected with temperature sensor.
Power supply is provided from the step-up transformer low voltage electric network side draw 220V power supplys of wind power generating set for constant pressure source
220V AC powers, constant pressure source is PLC control system, touch-screen, communication module, I/O modules, voltmeter, ammeter, contactor
24V dc sources are provided with auxiliary reclay.
Detection means realizes safety chain system, hardware using relay and contactor and PLC timer internal systems
Safety chain system is that contactor KM0 auxiliary normally-closed contact is connected in series in contactor KM1 drive control loop to form locking,
Software security catenary system is the run time for being periodically detected control system, if system program run-time error, or more than inspection
Restarting processing will be carried out to system by surveying the time limit.
The constant pressure source of detection means is the DC constant voltage power supply of continuously adjustabe, the range of nominal tension of output for 1kV~
12kV, rated current scope are 50mA~1A.Predominantly Insulation Inspection System provides stable voltage source.Being commonly applied voltage is
1kV, the requirement that can be detected according to generator insulating carries out the regulation of voltage.
Residual charge in discharge resistance consumption generator windings, discharge resistance is used to prevent the influence detection of system residual electric charge
The measurement accuracy of system.Equivalent capacity stored charge amount of the selection of generating resistance mainly in view of generator windings,
Consumed within the time of detecting system requirement.
Terminal box is by the outlet of generator unit stator winding and the access of system ground wire, then by cable tube by corresponding terminal
It is attached with the terminal in detection switch board, facilitates system wiring.
Temperature sensor is that thermocouple is put into inside generating set, to detect generator windings and generator
Temperature.When carrying out Insulation monitoring due to generator, the state of environment temperature and generator itself is different.The insulaion resistance of test
Also to be converted.Insulation resistance of generator is normalized using temperature conversion relational expression.
As shown in Fig. 2 a kind of generator insulating detection means of permanent-magnetic wind driven generator, internal principle be by constant pressure source,
Primary side after fuse, ammeter 1 and contactor KM2 series connection with voltmeter is in parallel, and voltmeter two ends are filled with overvoltage protection
Parallel connection is put, constant pressure source branch road is parallel to after contactor KM3, ammeter 2 and discharge resistance three series connection, constant pressure source branch road one end leads to
Cross contactor KM1 with generator unit stator binding post to be connected, the other end is connected with ground connection binding post.
A kind of detection method of the generator insulating detection means of permanent-magnetic wind driven generator comprises the following steps：
(1) working condition of blower fan is obtained by the PLC, communication device and control system of wind turbines, works as wind turbine
Group is in orderly closedown state, is again started up detection time of the state for time more than the generator insulating detection means and institute
When stating PLC timer internals arrival detection cycle, start the generator insulating detection means；
(2) when the startup time satisfaction of the generator insulating detection means is required, close contactor KM1 and simultaneously keep contact
Device KM2 and contactor KM3 is in open mode, generator unit stator voltage is measured by the voltmeter, when stator voltage is less than
During 600V, contactor KM3 is closed, generator unit stator residual charge is discharged using the discharge resistance, discharge time is big
In equal to 20 seconds, when first ammeter, which is measured, is less than 0.1A by the current value of the discharge resistance, postpone to break for 5 seconds
Open contactor KM3；
(3) after discharge process terminates, absorptance measurement pattern is selected according to working condition, contactor KM2 is connected and is generating electricity
Apply on machine stator and record the voltmeter and ammeter in the constant pressure source, pressure process respectively at 15 seconds and 60 seconds
Data, insulating resistance value when calculating respectively 15 seconds and 60 seconds, and calculate the absorptance of stator winding, according to scene
Actual temperature and humidity are normalized, and Stator insulation shape is judged using normalized resistance value and absorptance
State, sets threshold value, and insulating resistance value is small 0.5 megaohm.Detected value is alarmed.When being less than 1.2 for absorptance, alarmed
Processing；
(4) after discharge process terminates, polarization index measurement pattern is selected according to working condition, contactor KM2 is connected in hair
Apply on motor stator and record the voltmeter and ammeter in the constant pressure source, pressure process respectively 1 minute and 10 minutes
When data, insulating resistance value when calculating respectively 1 minute and 10 minutes, and calculate the polarization index of stator winding, according to
Live actual temperature and humidity are normalized, using normalizing insulating resistance value and polarization index judges that generating set is determined
Insulating sublayer state, sets threshold value, when being less than 1.3 for polarization index, carries out alert process；
(5) by continuously detecting calculating, the absorptance of generator unit stator winding is recorded, generator stator insulator is drawn and inhales
Receipts compare curve；By continuously detecting calculating, the polarization index of generator unit stator winding is recorded, generator stator insulator pole is drawn
Change exponential curve, and record in the memory cell of the PLC, the instruction PLC single measurements are finished；
(6) after single measurement is finished, contactor KM2 is disconnected first, contactor KM3 is connected afterwards, carries out generator windings
Remaining capacity discharges, and when voltmeter measurement voltage is less than 50V, disconnects contactor KM3 and contactor KM1, system enters
Self-clocking program is detected next time, and the PLC sends a signal to wind turbine control system detection and finished.
It is last it is to be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations.To the greatest extent
The present invention is described in detail with reference to the foregoing embodiments for pipe, it will be understood by those within the art that：It is still
Technical scheme described in foregoing embodiments can be modified, or which part technical characteristic is equally replaced
Change；And these modifications or replacement, the essence of appropriate technical solution is departed from the essence of various embodiments of the present invention technical scheme
God and scope.
Claims (6)
1. a kind of generator insulating detection means of permanent-magnetic wind driven generator, it is characterised in that the generator insulating detection dress
Put including：It is PLC, power supply, communication module, touch-screen, I/O modules, constant pressure source, voltmeter, ammeter, discharge resistance, molten
Disconnected device, over-pressure safety device, contactor, transmitter, auxiliary reclay, terminal box and temperature sensor；Wherein, ammeter includes
First ammeter and the second ammeter, transmitter include voltage transmitter, current transducer and temperature transmitter, and contactor includes
First contactor, second contactor and the 3rd contactor, PLC are connected with communication module and touch-screen respectively by connection
Connect, communication module is attached by connection and the control system of permanent-magnetic wind driven generator group, PLC by backboard connection with
I/O modules are connected, and multiple output ends of I/O modules are attached with auxiliary reclay and contactor respectively, PLC simulation input
End by voltage transmitter and the secondary side joint of voltmeter, PLC analog input end by current transducer and the first ammeter and
The secondary side joint of second ammeter, PLC analog input end connects temperature sensor by temperature transmitter；Constant pressure source, fuse,
Primary side after first ammeter and second contactor series connection with voltmeter is in parallel, and voltmeter two ends and over-pressure safety device are simultaneously
Connection, is connected in parallel to the branch road of constant pressure source after the 3rd contactor, the second ammeter and discharge resistance series connection, branch road one end of constant pressure source leads to
Cross first contactor with generator unit stator binding post to be connected, the other end is connected with ground connection binding post.
2. the generator insulating detection means of permanent-magnetic wind driven generator as claimed in claim 1, it is characterised in that：The power supply
Power supply provides 220V for the constant pressure source and handed over from the step-up transformer low voltage electric network side draw 220V power supplys of permanent-magnetic wind driven generator group
Power supply is flowed, the constant pressure source is the control system of the PLC, touch-screen, communication module, I/O modules, voltmeter, ammeter, connect
Tentaculum and auxiliary reclay provide 24V dc sources.
3. the generator insulating detection means of permanent-magnetic wind driven generator as claimed in claim 1, it is characterised in that：It is described to generate electricity
Machine insulation detection device also includes hardware security catenary system and software security catenary system；Hardware security catenary system is by contactor KM0
Auxiliary normally-closed contact and contactor KM1 the formation locking of drive control circuit in series, software security catenary system is used for periodically
The run time of the control system is detected, when the control system program run-time error or more than detection time limit, the control
System carries out restarting processing.
4. the generator insulating detection means of permanent-magnetic wind driven generator as claimed in claim 1, it is characterised in that：The constant pressure
Source is the DC constant voltage power supply of continuously adjustabe, and the output rated voltage scope of the constant pressure source is 1kV~12kV, rated current model
Enclose for 50mA~1A.
5. the generator insulating detection means of permanent-magnetic wind driven generator as claimed in claim 1, it is characterised in that：The electric discharge
Resistance is used to consume remaining electric charge in permanent-magnetic wind driven generator winding, and the Standard resistance range of the discharge resistance is：10kΩ-
100k Ω, power is more than or equal to 50 watts.
6. a kind of detection method of the generator insulating detection means of the permanent-magnetic wind driven generator described in usage right requirement 1, its
It is characterised by, comprises the following steps：
(1) work of permanent-magnetic wind driven generator is obtained by the PLC, communication device and permanent-magnetic wind driven generator set control system
State, is examined when permanent-magnetic wind driven generator group is in orderly closedown state or is again started up state for time more than the generator insulating
When the detection time and the PLC timer internals for surveying device reach detection cycle, start the generator insulating detection dress
Put；
(2) when the startup time satisfaction of the generator insulating detection means is required, close contactor KM1 and simultaneously keep contactor
KM2 and contactor KM3 is in open mode, generator unit stator voltage is measured by the voltmeter, when stator voltage is less than
During 600V, contactor KM3 is closed, generator unit stator residual charge is discharged using the discharge resistance, discharge time is big
In equal to 20 seconds, when first ammeter, which is measured, is less than 0.1A by the current value of the discharge resistance, postpone to break for 5 seconds
Open contactor KM3；
(3) after discharge process terminates, absorptance measurement pattern is selected according to working condition, contactor KM2 is connected fixed in generator
Apply the number for recording the voltmeter and ammeter in the constant pressure source, pressure process respectively at 15 seconds and 60 seconds on son
According to, insulating resistance value when calculating respectively 15 seconds and 60 seconds, and the absorptance of stator winding is calculated, according to live actual
Temperature and humidity is normalized, using normalizing insulating resistance value and absorptance judges that Stator insulate shape
State；
(4) after discharge process terminates, polarization index measurement pattern is selected according to working condition, contactor KM2 is connected in generator
Apply on stator and record the voltmeter and ammeter in the constant pressure source, pressure process respectively at 1 minute and 10 minutes
Data, insulating resistance value when calculating respectively 1 minute and 10 minutes, and the polarization index of stator winding is calculated, according to scene
Actual temperature and humidity are normalized, using normalizing insulating resistance value and polarization index judges that Stator is exhausted
Edge state；
(5) by continuously detecting calculating, the absorptance of generator unit stator winding is recorded, generator stator insulator absorptance is drawn
Curve；By continuously detecting calculating, the polarization index of generator unit stator winding is recorded, generator stator insulator polarization is drawn and refers to
Number curve, and record in the memory cell of the PLC, the instruction PLC single measurements are finished；
(6) after single measurement is finished, contactor KM2 is disconnected first, contactor KM3 is connected afterwards, carries out generator windings remaining
Electricity discharges, and when voltmeter measurement voltage is less than 50V, disconnects contactor KM3 and contactor KM1, system enters next
Secondary detection self-clocking program, the PLC sends a signal to the control system of permanent-magnetic wind driven generator group, generator insulating detection
Finish.
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| CN201710270394.6A CN107144787A (en) | 2017-04-24 | 2017-04-24 | The generator insulating detection means and detection method of a kind of permanent-magnetic wind driven generator |
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| CN201710270394.6A CN107144787A (en) | 2017-04-24 | 2017-04-24 | The generator insulating detection means and detection method of a kind of permanent-magnetic wind driven generator |
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