CN109950037A - A kind of Flow varying power supply device and drying method being dried for distribution transformer body - Google Patents
A kind of Flow varying power supply device and drying method being dried for distribution transformer body Download PDFInfo
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- CN109950037A CN109950037A CN201910280441.4A CN201910280441A CN109950037A CN 109950037 A CN109950037 A CN 109950037A CN 201910280441 A CN201910280441 A CN 201910280441A CN 109950037 A CN109950037 A CN 109950037A
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Abstract
A kind of Flow varying power supply device and drying method being dried for distribution transformer body, this device utilizes low-pressure side short-circuiting method, carry out unsteady flow heating and transformation, novel three-phase transformer high-low pressure winding conducting wire resistance measuring module is provided, the purpose measured respectively high-low pressure winding temperature is realized.After device data analysis unit can analyze winding temperature, it issues to Variable flow control unit control instruction, can both realize heating while to winding, can also realize the independent heating to winding, this device and method are preferably combined distribution transformer machine body structure feature, and drying effect is more preferable.The present invention is by above structure and method, the technical issues of solving long processing time existing in the prior art, poor processing effect and influence using transformer service life.
Description
Technical field
The invention belongs to potential device field, and in particular to a kind of change being dried for distribution transformer body
Galvanic electricity source device and drying method.
Background technique
Distribution transformer as important power transmission and transforming equipment, good body insulation be ensure its safe operation it is important because
Element.Distribution transformer body is mainly assembled by transformer winding coil, iron core, insulating materials and folder.Its insulating materials
It is distributed on iron core and coil, for promoting the dielectric level of transformer, improves insulation pressure resistance and anti-electrical breakdown capability.
Distribution transformer body universal architecture and use insulating materials are distributed as follows: iron core is in innermost layer, low pressure winding warp
Evenly around around iron core, high-voltage winding is centered around around low pressure winding through insulating board isolation for the isolation of insulating board, high
Pressure and low pressure winding conducting wire do insulation processing through insulating paper package and leads support, clamping tightly use insulating layer pressed wood
Material, since its such insulating materials there is preferable adsorption capacity to need before carrying out oiling general assembly hydrone
Dehydration and drying processing is carried out to the insulating materials of body.
The process of existing body heat treatment at present, is broadly divided into a. hot air circulation drying process a；B. transformation method
Drying process；C. low frequency short circuit heating means；
A. hot air circulation drying process: being to provide heating heat by heat pipe inside drying chamber or hothouse or heating wire
Amount, and the method by blower by hot wind in drying chamber or dry indoor circulation carries out dry processing to transformer body.
B. transformation method drying process method: being evaporated and condense to conduction oil using heat pipe, completes exhausted for transformer
The drying process of edge.
When using hot wind and transformation method seasoning, due to body, its radial depth is thicker, especially to being distributed in body
Internal low pressure winding and iron core, inner layer drying effect is unobvious, is easy to appear over dry layer, i.e., wet in doing outside, belongs to tradition side
The disadvantages of formula dries blind area, and the generally existing thermal efficiency of such technique is low, the processing time is long.
C. low frequency circuit drying method: be using to low pressure winding short circuit, high-voltage winding electrified regulation from inside to outside plus
Heat drying mode, can efficiently solve above two method there are the problem of, be the upgrade version of first two method.
When using traditional low-frequency circuit drying technique, although to heat from inside to outside, due to high pressure and low pressure winding
The line footpath that conducting wire uses is different, and there are the temperature difference for high-voltage winding and low pressure winding, but the structure of regular distribution transformer at present, usually
Reserved thermometric channel or pre-buried temperature-measuring optical fiber will not be provided for body, therefore the temperature measurement of body drying process is mainly by outer
The thermocouple connect is completed, this temperature can only characterize high-pressure side winding temperature, can not carry out accurate thermometric to low-pressure side winding temperature,
Therefore it cannot achieve to the processing of deficient temperature winding independent heat drying, heat simultaneously, and there are low temperature winding degree of drying deficiency, it is high
Warm winding is dry excessively, insulating materials life problems is damaged, so the space that drying effect still has a distinct increment.
Summary of the invention
In view of the above problems, the invention proposes a kind of Flow varying power supply being dried for distribution transformer body
Device and drying method carry out unsteady flow heating and transformation using low-pressure side short-circuiting method, and provided by the invention novel three
Phase transformer high-low pressure winding conducting wire resistance measuring module, realizes the purpose measured respectively high-low pressure winding temperature, dress
It after setting data analysis unit and can analyzing winding temperature, issues to Variable flow control unit control instruction, can both realize pair
It is heated while winding, can also realize the independent heating to winding, this device and method are preferably combined distribution transformer
Machine body structure feature, drying effect are more preferable.
To achieve the goals above, the technical solution that the invention uses are as follows: one kind is dry for distribution transformer body
The Flow varying power supply device of dry processing, it is characterised in that: include control system module, unsteady flow power switching modules, air pressure transformation
Processing module；
Include the signal input part of parameter acquisition unit in the control system module, connects unsteady flow power switching modules
In Current Voltage sensor gentle buckling pressure processing module in baroceptor, the signal output end connection of counting collection unit
Output signal is divided into two-way by the signal output end of data analysis and processing unit, data analysis and processing unit, passes through air pressure all the way
It is connect after control unit with the pressure control execution unit in air pressure transformation processing module, after another way passes through Variable flow control unit
It is connect with the three-phase in unsteady flow power switching modules/single-phase rectifier power cell and three phase power output unit；
The unsteady flow power switching modules are connect with distribution transformer winding, Current Voltage sensor detection winding telecommunications
Number；Three-phase/single-phase rectifier power cell and three phase power output unit are connect with distribution transformer high-voltage winding side inlet wire；
The air pressure transformation processing module and distribution transformer body is located in same cabinet, pressure control execution unit
It is made of air circulation unit and air dryer unit, the air inlet of air circulation unit and the gas outlet of vacuum tank unit connect
It connects, the air inlet of air dryer unit is connect with the air inlet of vacuum tank unit.
The control system module is by data analysis and processing unit, parameter acquisition unit, transformer winding temperature detection
Unit, pressure control unit and Variable flow control unit composition；Variable flow control unit by the three-phase in unsteady flow power switching modules/
Single-phase rectifier power cell and three phase power output unit control the electric signal being connected on the high and low winding of distribution transformer.
Three-phase/single-phase rectifier power cell in the unsteady flow power switching modules by diode, thyristor, and
The single-phase or three-phase bridge rectifier circuit composition that mosfet or IGBT is built；Three phase power output in unsteady flow power switching modules
Unit is made of the three-phase inverter bridge circuit that mosfet or IGBT are built；The distribution transformer that Current Voltage sensor will test
The voltage and current electrical quantity signal input control system module of device first winding, and receive having for control system module output
The current signal of signal is controlled as the power supply of distribution transformer body high-voltage winding.
The current signal with control signal is three kinds of different types of current signals, is respectively: three-phase high frequency
Sinewave output current signal or three phase low frequency sinewave output current signal or single-phase DC output current signal.
Air pressure transformation processing module is by vacuum tank unit, Pressure monitoring unit, pressure control execution unit composition, air pressure prison
Survey unit baroceptor provide air pressure pressure non-electrical class signal input control system module, pressure control execution unit by
Air circulation unit and air dryer unit composition outside vacuum tank unit is installed, pressure control execution unit receives control system
The control signal that system module issues, controls the air pressure pressure in vacuum tank unit；Control system module controls air circulation unit
Extraction air is simultaneously dried into air dryer unit, and the air output end after air dryer unit is dry connects vacuum tank list
Member back and forth runs the aqueous vapor for generating transformer winding during heating and is discharged by air dryer unit.
A kind of method that the device carries out the drying process of distribution transformer body, which is characterized in that the steps include:
1) it presets: using the nominal parameter of transformer as initial value input data analysis processing unit；
2) preparation stage:
2.1) leakage test, gas vacuum tank leakage test: are carried out to transformer vacuum tank by air pressure transformation processing module
Buckling presses the atmospheric pressure value of the Pressure monitoring unit real time monitoring transformer vacuum tank in processing module, while passing through control system mould
Parameter acquisition unit in block measures the initial value of transformer first winding and secondary winding；In actual mechanical process
In, first winding is the variation with environment temperature with secondary winding and changes；
2.2) it vacuumizes:
Control system module carries out vacuum pumping to voltage control module, and body is reached close to vacuum state,
The air containing moisture in vacuum tank is removed, and lasting is kept to the vacuum state and is evacuated；
3) heating period I:
Air dryer unit in this stage, control pressure control execution unit, to being mounted on vacuum tank unit bottom
Breather valve carry out aeration, it is lasting to inject dry hot gas, the moisture come out for circulating filtration transformer heat drying；It is logical
Unsteady flow power switching modules are crossed to heat transformer winding；During heating, it is adopted by the parameter of control system module
Collect unit monitor transformer winding temperature, using the rated temperature of setting as the boundary of average winding temperatures, and heat except coil it
Outer insulating element removes moisture；
4) stabilization sub stage:
After transformer winding mean temperature reaches rated temperature, stops heating, prevent transformation into steady state phase
Device continuous heating and damage；During stabilization sub stage, dry hot gas persistent loop prevents vapor from condensing in vacuum tank；
5) heating period II:
After stabilization sub stage, reheating is carried out to transformer tank；Frequency conversion electric current and cyclic drying hot gas are by transformer
Winding is heated above+10 DEG C of rated temperature；It is primary to determine that winding resistance is measured by transformer winding temperature measurement unit
Winding temperature and secondary winding temperature；If first winding temperature is less than+10 DEG C of rated temperature, from unsteady flow power switching modules
First winding is heated with DC current, until first winding is heated to+10 DEG C of rated temperature；
6) stage is done eventually:
Into after the dry stage eventually, circulation hot gas be will not be used, and control voltage control module discharges air pressure, discharge dry nitrogen
Gas enters vacuum tank, completes to be dried.
In the heating period I and heating period II, heating rate is controlled within 1 DEG C/min, to limit cellulose
The depolymerization of insulating layer guarantees that non-coil insulating layer part obtains heating appropriate.
Parameter acquisition unit in the step 2.1) carries out the initial value of transformer first winding and secondary winding
The method of measurement is as follows: utilize transformer T-type equivalent circuit, transformer is initially controlled Variable flow control unit output high frequency,
Low frequency and DC current signal are applied in transformer body high-voltage winding, by measuring high pressure, low pressure side resistance respectively, according to
Each winding mean temperature is directly calculated in resistance temperature equivalent formulation.
The parameter acquisition unit has the method that the initial value of transformer first winding and secondary winding measures
Body are as follows:
The output signal of Variable flow control unit, control unsteady flow power switching modules output frequency are 300Hz three-phase sine-wave
Electric current is applied in transformer body high-voltage winding, keeps low-pressure side winding short circuit state, calculates the transformation of one group of current frequency
The total leakage reactance of device；The output signal of Variable flow control unit, control unsteady flow power switching modules output frequency are 10Hz three phase sine
Wave electric current is applied in transformer body high-voltage winding, is kept low-pressure side winding short circuit state, is calculated another group of current frequency
This equations simultaneousness is obtained the total leakage inductance of transformer body and total resistance value by the total leakage reactance of transformer；
The output signal of Variable flow control unit controls unsteady flow power switching modules output single-phase direct current, is applied to transformer
In body high-voltage winding, due to the law of electromagnetic induction, direct current will not be transmitted to low-pressure side, and the low-pressure side mode of connection is defeated to high-pressure side
Entering direct current does not influence；After DC stabilization, input voltage and input current are measured, the resistance value being calculated is single-phase high voltage
Side resistance；Afterwards in the output of unsteady flow power switching modules be three-phase, when using single-phase DC signal, need to be divided into three groups it is defeated
Enter, the every phase winding resistance value of measuring transformer high-pressure side A/B/C three-phase；
By alternating current-direct current mode, high-voltage winding resistance and low pressure winding resistance are calculated separately out, recycles temperature and resistance
Reduction formula calculates each winding actual temperature.
The invention has the beneficial effect that
The present invention is based on disadvantages mentioned above, propose a kind of suitable for each winding electricity of Three-Phase Distribution Transformers body on-line measurement
The drying device and method of resistance, by the direct measurement to each winding resistance of transformer body, by obtaining the reality of each winding
Temperature is not necessarily to manual intervention in the drying process, and controls by control system module to the gentle buckling pressure of Variable flow control module
It manages module and carries out coordinated control, be mainly used in distribution transformer three-phase body without being thermally dried processing work under oil condition
Skill.The present invention both ensure that the internally dry effect of body, in turn avoid the highly energy-consuming of traditional scheme, and processing time length etc. lacks
Point.
The accurate thermometric to each winding of transformer that the present invention realizes, while both having realized to transformer high-low-voltage winding
Heating, and realize and targetedly deficient temperature winding is individually heated, not only play the role of improving body drying effect, but also same
When protect to the insulation life for having reached drying temperature winding.
Detailed description of the invention
Fig. 1 is control method flow chart.
Fig. 2 is circuit block diagram.
Fig. 3 is circuit diagram a.
Fig. 4 is circuit diagram b.
Fig. 5 is circuit diagram c.
Fig. 6 is circuit diagram d.
Fig. 7 is circuit diagram e.
Fig. 8 is the circuit diagram f connecting with circuit diagram e.
Fig. 9 is the circuit diagram g connecting with circuit diagram f.
Specific embodiment
A kind of Flow varying power supply device being dried for distribution transformer body, includes control system module 1, unsteady flow
Power switching modules 2, air pressure transformation processing module 3；
Include the signal input part of parameter acquisition unit in the control system module 1, connects unsteady flow power switch mould
The baroceptor in the gentle buckling pressure processing module 3 of Current Voltage sensor in block 2, the signal output end of counting collection unit
Data analysis and processing unit is connected, output signal is divided into two-way, passed through all the way by the signal output end of data analysis and processing unit
It is connect after pressure control unit with the pressure control execution unit in air pressure transformation processing module 3, another way passes through Variable flow control
It is connect after unit with the three-phase in unsteady flow power switching modules 2/single-phase rectifier power cell and three phase power output unit；
The unsteady flow power switching modules 2 are connect with distribution transformer winding, Current Voltage sensor detection winding electricity
Signal；Three-phase/single-phase rectifier power cell and three phase power output unit are connect with distribution transformer high-voltage winding side inlet wire；
The air pressure transformation processing module 3 and distribution transformer body is located in same cabinet, and pressure control executes list
Member is made of air circulation unit and air dryer unit, and the air inlet of air circulation unit and the gas outlet of vacuum tank unit connect
It connects, the air inlet of air dryer unit is connect with the air inlet of vacuum tank unit.
The control system module 1 is by data analysis and processing unit, parameter acquisition unit, transformer winding temperature detection
Unit, pressure control unit and Variable flow control unit composition；Variable flow control unit passes through three in unsteady flow power switching modules 2
Phase/single-phase rectifier power cell and three phase power output unit control the telecommunications being connected on the high and low winding of distribution transformer
Number.
Three-phase/single-phase rectifier power cell in the unsteady flow power switching modules 2 by diode, thyristor, and
The single-phase or three-phase bridge rectifier circuit composition that mosfet or IGBT is built；Three phase power in unsteady flow power switching modules 2 is defeated
Unit is made of the three-phase inverter bridge circuit that mosfet or IGBT are built out；The distribution that Current Voltage sensor will test becomes
The voltage and current electrical quantity signal input control system module 1 of depressor first winding, and receive the output of control system module 1
Current signal with control signal is the power supply of distribution transformer body high-voltage winding.
The current signal with control signal is three kinds of different types of current signals, is respectively: three-phase high frequency
Sinewave output current signal or three phase low frequency sinewave output current signal or single-phase DC output current signal.
Air pressure transformation processing module 3 is by vacuum tank unit, Pressure monitoring unit, pressure control execution unit composition, air pressure
The baroceptor of monitoring unit provides air pressure pressure non-electrical class signal input control system module 1, and pressure control executes list
Member by outside vacuum tank unit air circulation unit and air dryer unit form, pressure control execution unit receive control system
The control signal that system module 1 issues, controls the air pressure pressure in vacuum tank unit；Control system module 1 controls air circulation list
Member extraction air is simultaneously dried into air dryer unit, and the air output end after air dryer unit is dry connects vacuum tank
Unit back and forth runs the aqueous vapor for generating transformer winding during heating and is discharged by air dryer unit.
A kind of method that the device carries out the drying process of distribution transformer body, which is characterized in that the steps include:
1) it presets: using the nominal parameter of transformer as initial value input data analysis processing unit；
2) preparation stage:
2.1) leakage test, gas vacuum tank leakage test: are carried out to transformer vacuum tank by air pressure transformation processing module 3
Buckling presses the atmospheric pressure value of the Pressure monitoring unit real time monitoring transformer vacuum tank in processing module, while passing through control system mould
Parameter acquisition unit in block (1) measures the initial value of transformer first winding and secondary winding；In practical operation
Cheng Zhong, first winding are the variations with environment temperature with secondary winding and change；
2.2) it vacuumizes:
Control system module (1) carries out vacuum pumping to voltage control module 3, and body is reached close to vacuum shape
State, the interior air containing moisture of removal vacuum tank, and lasting is kept to the vacuum state and is evacuated；
3) heating period I:
Air dryer unit in this stage, control pressure control execution unit, to being mounted on vacuum tank unit bottom
Breather valve carry out aeration, it is lasting to inject dry hot gas, the moisture come out for circulating filtration transformer heat drying；It is logical
Unsteady flow power switching modules are crossed to heat transformer winding；During heating, it is adopted by the parameter of control system module 1
Collect unit monitor transformer winding temperature, using the rated temperature of setting as the boundary of average winding temperatures, and heat except coil it
Outer insulating element removes moisture；
4) stabilization sub stage:
After transformer winding mean temperature reaches rated temperature, stops heating, prevent transformation into steady state phase
Device continuous heating and damage；During stabilization sub stage, dry hot gas persistent loop prevents vapor from condensing in vacuum tank；
5) heating period II:
After stabilization sub stage, reheating is carried out to transformer tank；Frequency conversion electric current and cyclic drying hot gas are by transformer
Winding is heated above+10 DEG C of rated temperature；It is primary to determine that winding resistance is measured by transformer winding temperature measurement unit
Winding temperature and secondary winding temperature；If first winding temperature is less than+10 DEG C of rated temperature, from unsteady flow power switching modules
First winding is heated with DC current, until first winding is heated to+10 DEG C of rated temperature；
6) stage is done eventually:
Into after the dry stage eventually, circulation hot gas be will not be used, and control voltage control module discharges air pressure, discharge dry nitrogen
Gas enters vacuum tank, completes to be dried.
In the heating period I and heating period II, heating rate is controlled within 1 DEG C/min, to limit cellulose
The depolymerization of insulating layer guarantees that non-coil insulating layer part obtains heating appropriate.
Parameter acquisition unit in the step 2.1) carries out the initial value of transformer first winding and secondary winding
The method of measurement is as follows: utilize transformer T-type equivalent circuit, transformer is initially controlled Variable flow control unit output high frequency,
Low frequency and DC current signal are applied in transformer body high-voltage winding, by measuring high pressure, low pressure side resistance respectively, according to
Each winding mean temperature is directly calculated in resistance temperature equivalent formulation.
The parameter acquisition unit has the method that the initial value of transformer first winding and secondary winding measures
Body are as follows:
The output signal of Variable flow control unit, control unsteady flow power switching modules output frequency are 300Hz three-phase sine-wave
Electric current is applied in transformer body high-voltage winding, keeps low-pressure side winding short circuit state, calculates the transformation of one group of current frequency
The total leakage reactance of device；The output signal of Variable flow control unit, control unsteady flow power switching modules output frequency are 10Hz three phase sine
Wave electric current is applied in transformer body high-voltage winding, is kept low-pressure side winding short circuit state, is calculated another group of current frequency
This equations simultaneousness is obtained the total leakage inductance of transformer body and total resistance value by the total leakage reactance of transformer；
The output signal of Variable flow control unit controls unsteady flow power switching modules output single-phase direct current, is applied to transformer
In body high-voltage winding, due to the law of electromagnetic induction, direct current will not be transmitted to low-pressure side, and the low-pressure side mode of connection is defeated to high-pressure side
Entering direct current does not influence；After DC stabilization, input voltage and input current are measured, the resistance value being calculated is single-phase high voltage
Side resistance；Afterwards in the output of unsteady flow power switching modules be three-phase, when using single-phase DC signal, need to be divided into three groups it is defeated
Enter, the every phase winding resistance value of measuring transformer high-pressure side A/B/C three-phase；
By alternating current-direct current mode, high-voltage winding resistance and low pressure winding resistance are calculated separately out, recycles temperature and resistance
Reduction formula calculates each winding actual temperature.
Embodiment 1:
A kind of transformer dry device, including control system module, unsteady flow power switching modules and air pressure transformation handle mould
Block.Control system module carries out parameter acquisition to the sensor built in unsteady flow power switching modules and air pressure transformation processing module,
Control instruction is issued after Data Analysis Services, controls the gentle buckling pressure processing of output electric current of unsteady flow power switching modules respectively
The air pressure pressure level of module.220V/380V power supply accesses unsteady flow power switching modules, and the sensor built in the module mentions
Voltage supplied and current electrical amount signal input system control module, and receive the control signal that system control module issues, it exports
Different types of current signal is the power supply of distribution transformer body high-voltage winding.Air pressure sensing built in air pressure transformation processing module
Device provides air pressure pressure non-electrical class signal input control system module, and receives the control signal that system control module issues,
Control the air pressure pressure in vacuum tank unit.
Control system module and all other module are by being electrically connected and issuing control signal, and control system module is by counting
According to analysis and processing unit, parameter acquisition unit, transformer winding temperature measurement unit, pressure control unit and Variable flow control
Unit composition.Unsteady flow power switching modules output variable current signal, by distribution transformer body high-voltage winding side into
Line connection so that generating electric current or unilateral generation electric current on distribution transformer body high-low pressure winding simultaneously, and then makes transformer
Winding generates heat, and unsteady flow power switching modules are made of three-phase or single-phase rectifier power cell and three phase power output unit,
The power cell composition device can be the device of the controllable shutdown such as MOSFET or IGBT.Air pressure transformation processing module,
By a vacuum tank unit, Pressure monitoring unit, pressure control execution unit composition, air pressure execution unit is by air circulation list
Member, air dryer unit composition.
Control system module introduction: by data analysis unit, parameter acquisition unit, transformer winding temperature measurement unit,
Pressure control unit and Variable flow control unit composition.It is characterized by: after control system module powers on, transformer is specified
Parameter is as initial value input data analysis processing unit, and parameter acquisition unit is by air pressure pressure intensity parameter and unsteady flow power switch mould
Voltage, current electrical amount parameter acquisition in block upload to data analysis and processing unit, distinguish thermometric using each winding of transformer
Original state transformer height winding temperature is recorded, each winding is reached temperature as controlled object in advance, is being added by implementation method
At hot initial stage, when winding temperature is close to room temperature, control unsteady flow power switching modules heat transformer high-low-voltage winding simultaneously, this
Shi Bianliu switching frequency module output current frequency and virtual value automatically adjust according to power factor maximum value, control simultaneously
System module, which carries out evacuation to voltage control module, enables body to reach close to vacuum, and keeps continuing to the vacuum state
It evacuates, for be discharged the moisture evaporated from body, the heating of cooperation unsteady flow switch module, in heating process, transformer winding
Temperature measurement unit mutually switches with heating process always, after thering is side winding to reach desired temperature, unsteady flow power switch mould
Block switches to heated on one side operating mode, after each winding of transformer body reaches desired temperature, stops heating, into dry rank eventually
Section, control voltage control module discharge air pressure, and release dry air enters vacuum tank, complete to be dried.
Unsteady flow power switching modules: unsteady flow power switching modules are defeated by three-phase or single-phase rectifier power cell and three phase power
Unit forms out.It is characterized in that three-phase or single-phase rectifier power cell were built by diode, thyristor, mosfet or IGBT
Single-phase or three-phase bridge rectifier circuit composition, the three-phase bridge type inverse electricity that three phase power output unit is built by mosfet or IGBT
Road composition, the sensor built in the module provides voltage and current electrical quantity signal input system control module, and receives system
The control signal that control module issues, having three kinds of different types of current signals of output is distribution transformer body high-voltage winding
Power supply, realizes different demands for control.It is respectively: three-phase high_frequency sine wave output current signal, three phase low frequency sinewave output electricity
Flow signal, single-phase DC output current signal.
Air pressure transformation processing module: by a vacuum tank unit, Pressure monitoring unit, pressure control execution unit is formed,
Air pressure execution unit is by air circulation unit, air dryer unit composition.Baroceptor built in air pressure transformation processing module
Air pressure pressure non-electrical class signal input control system module is provided, and receives the control signal that system control module issues, is controlled
Air pressure pressure in vacuum tank unit processed.Vacuum tank unit include air inlet and gas outlet, the air inlet of air circulation unit with
The outlet of vacuum tank unit is connected, and the air inlet of air dryer unit is connected with the air inlet of vacuum tank unit.Control system mould
Block control air circulation unit extraction air enters air dryer unit and is dried, and the air after drying reenters vacuum tank
In unit, the aqueous vapor for and so on constantly generating transformer winding during heating is discharged by air dryer unit.
Each winding of transformer distinguishes thermometric implementation method:
This method by measuring high pressure, low pressure side resistance respectively, according to resistance temperature equivalent formulation, is directly calculated each
Winding mean temperature, specific implementation method: utilizing transformer T-type equivalent circuit, have no need to change low pressure winding short-circuit condition, will
High frequency, low frequency and the DC current signal that transformer initially controls the output of Variable flow control unit are applied to transformer body high voltage winding
In group.
(1) control Variable flow control unit control signal to unsteady flow power switching modules output frequency be 300Hz three phase sine
Wave electric current is applied in transformer body high-voltage winding, keeps low-pressure side winding short circuit state, calculates the change of one group of current frequency
The total leakage reactance of depressor, control Variable flow control unit control signal to unsteady flow power switching modules output frequency are 10Hz three phase sine
Wave electric current is applied in transformer body high-voltage winding, is kept low-pressure side winding short circuit state, is calculated another group of current frequency
This equations simultaneousness is obtained the total leakage inductance of transformer body and total resistance value by the total leakage reactance of transformer.
(2) control Variable flow control unit control signal is applied to transformer to unsteady flow power switching modules output single-phase direct current
In body high-voltage winding, because of the law of electromagnetic induction, direct current will not be transmitted to low-pressure side, therefore the low-pressure side mode of connection is to high pressure
Side input direct-current does not influence, and after DC stabilization, measures input voltage and input current, the resistance value being calculated at this time are
Single-phase high voltage side resistance, because the output of unsteady flow power switching modules is that three-phase needs to be divided into when using single-phase DC signal
Three groups of inputs, the every phase winding resistance value of measuring transformer high-pressure side A/B/C three-phase.
(3) by alternating current-direct current mode, high-voltage winding resistance and low pressure winding resistance can be calculated separately out, recycles temperature
Each winding actual temperature is calculated with resistance reduction formula.
Implementation steps
(1) vacuum tank reveals test phase:
Leakage test is carried out to transformer vacuum tank by air pressure transformation processing module, the gas in air pressure transformation processing module
The atmospheric pressure value of monitoring unit real time monitoring transformer vacuum tank is pressed, while passing through the parameter acquisition unit pair in control system module
The initial value of transformer first winding and secondary winding measures.In the actual operation process, first winding and secondary winding
It is the variation with environment temperature and changes.
(2) vacuumizing phase:
Control system module carries out vacuum pumping to voltage control module, and body is reached close to vacuum state,
The air containing moisture in vacuum tank is removed, and lasting is kept to the vacuum state and is evacuated.
(3) heating period I:
Under lasting evacuated, breather valve is opened, it is lasting to inject dry hot gas, it is dry for the heating of circulating filtration transformer
The dry moisture come out.Transformer winding is heated by unsteady flow power switching modules.During heating, it is by control
The parameter acquisition unit monitoring transformer winding temperature of system module prevents temperature with 100 degrees Celsius of average winding temperatures for boundary
It is excessively high, transformer is damaged, and heat insulating element than the coil, removes moisture.
Since insulating layer moisture content is high, heating rate must be controlled within 1 degree min, to limit cellulose insulating layer
Depolymerization guarantees that non-coil insulating layer part obtains heating appropriate.
(4) stabilization sub stage:
After transformer winding mean temperature reaches 100 degrees Celsius, stop heating, into steady state phase, it is therefore an objective to
Prevent transformer lasts from heating and damaging.During stabilization sub stage, dry hot gas persistent loop, to prevent water steam in vacuum tank
Interior condensation.
(5) heating period II:
After stabilization sub stage, reheating is carried out to transformer tank.Frequency conversion electric current and cyclic drying hot gas are by transformer
Winding is heated to T11 temperature (average winding temperatures that resistance measures are 110 degrees Celsius).It is measured by transformer winding temperature single
Member measures winding resistance to determine first winding temperature and secondary winding temperature.If first winding temperature less than 110 degrees Celsius,
First winding then is heated from unsteady flow power switching modules DC current, until first winding is heated to 110 degrees Celsius.Primary
It is critically important that winding, which is heated to 110 degrees Celsius, because it has highest voltage class and most thick insulating materials.
(6) stage is done eventually:
Into after the dry stage eventually, circulation hot gas be will not be used, and control voltage control module discharges air pressure, discharge dry nitrogen
Gas enters vacuum tank, completes to be dried.
Claims (9)
1. a kind of Flow varying power supply device being dried for distribution transformer body, it is characterised in that: include control system
Module (1), unsteady flow power switching modules (2), air pressure transformation processing module (3)；
Include the signal input part of parameter acquisition unit in the control system module (1), connects unsteady flow power switching modules
(2) baroceptor in gentle buckling pressure processing module (3) of Current Voltage sensor in, the signal output of counting collection unit
Output signal is divided into two-way, a-road-through by end connection data analysis and processing unit, the signal output end of data analysis and processing unit
It is connect after crossing pressure control unit with the pressure control execution unit in air pressure transformation processing module (3), another way passes through unsteady flow
After control unit in unsteady flow power switching modules (2) three-phase/single-phase rectifier power cell and three phase power output unit connect
It connects；
The unsteady flow power switching modules (2) are connect with distribution transformer winding, Current Voltage sensor detection winding telecommunications
Number；Three-phase/single-phase rectifier power cell and three phase power output unit are connect with distribution transformer high-voltage winding side inlet wire；
The air pressure transformation processing module (3) and distribution transformer body is located in same cabinet, pressure control execution unit
It is made of air circulation unit and air dryer unit, the air inlet of air circulation unit and the gas outlet of vacuum tank unit connect
It connects, the air inlet of air dryer unit is connect with the air inlet of vacuum tank unit.
2. a kind of Flow varying power supply device being dried for distribution transformer body according to claim 1 and, it is special
Sign is: the control system module (1) is examined by data analysis and processing unit, parameter acquisition unit, transformer winding temperature
Survey unit, pressure control unit and Variable flow control unit composition；Variable flow control unit passes through in unsteady flow power switching modules (2)
Three-phase/single-phase rectifier power cell and three phase power output unit control the telecommunications being connected on the high and low winding of distribution transformer
Number.
3. a kind of Flow varying power supply device being dried for distribution transformer body according to claim 1 and, it is special
Sign is: three-phase/single-phase rectifier power cell in the unsteady flow power switching modules (2) by diode, thyristor, and
The single-phase or three-phase bridge rectifier circuit composition that mosfet or IGBT is built；Three phase power in unsteady flow power switching modules (2)
Output unit is made of the three-phase inverter bridge circuit that mosfet or IGBT are built；The distribution that Current Voltage sensor will test
The voltage and current electrical quantity signal input control system module (1) of transformer first winding, and receive control system module (1)
The current signal with control signal of output is the power supply of distribution transformer body high-voltage winding.
4. according to claim 3 state it is a kind of for distribution transformer body be dried Flow varying power supply device and, feature
Be: the current signal with control signal is three kinds of different types of current signals, is respectively: three-phase high frequency sinusoidal
Wave output current signal or three phase low frequency sinewave output current signal or single-phase DC output current signal.
5. a kind of Flow varying power supply device being dried for distribution transformer body according to claim 1 and, it is special
Sign is: air pressure transformation processing module (3) is by vacuum tank unit, Pressure monitoring unit, pressure control execution unit composition, air pressure
The baroceptor of monitoring unit provides air pressure pressure non-electrical class signal input control system module (1), and pressure control executes
Unit by outside installation vacuum tank unit air circulation unit and air dryer unit form, pressure control execution unit receive
The control signal that control system module (1) issues controls the air pressure pressure in vacuum tank unit；Control system module (1) control
Air circulation unit extraction air is simultaneously dried into air dryer unit, the air output end after air dryer unit is dry
Vacuum tank unit is connected, the aqueous vapor for generating transformer winding during heating is back and forth run and is arranged by air dryer unit
Out.
6. a kind of method for carrying out the drying process of distribution transformer body using device described in claim 1-5, feature
It is, the steps include:
1) it presets: using the nominal parameter of transformer as initial value input data analysis processing unit；
2) preparation stage:
2.1) leakage test, air pressure vacuum tank leakage test: are carried out to transformer vacuum tank by air pressure transformation processing module (3)
The atmospheric pressure value of Pressure monitoring unit real time monitoring transformer vacuum tank in transformation processing module, while passing through control system module
(1) parameter acquisition unit in measures the initial value of transformer first winding and secondary winding；In actual mechanical process
In, first winding is the variation with environment temperature with secondary winding and changes；
2.2) it vacuumizes:
Control system module (1) carries out vacuum pumping to voltage control module (3), and body is reached close to vacuum shape
State, the interior air containing moisture of removal vacuum tank, and lasting is kept to the vacuum state and is evacuated；
3) heating period I:
Air dryer unit in this stage, control pressure control execution unit leads to vacuum tank unit bottom is mounted on
Air valve carries out aeration, lasting to inject dry hot gas, the moisture come out for circulating filtration transformer heat drying；Pass through change
Stream power switching modules heat transformer winding；During heating, pass through the parameter acquisition of control system module (1)
Unit monitors transformer winding temperature, using the rated temperature of setting as the boundary of average winding temperatures, and heats than the coil
Insulating element, remove moisture；
4) stabilization sub stage:
After transformer winding mean temperature reaches rated temperature, stops heating, prevent transformer from holding into steady state phase
Continue heating and damages；During stabilization sub stage, dry hot gas persistent loop prevents vapor from condensing in vacuum tank；
5) heating period II:
After stabilization sub stage, reheating is carried out to transformer tank；Frequency conversion electric current and cyclic drying hot gas are by transformer winding
It is heated above+10 DEG C of rated temperature；Winding resistance is measured by transformer winding temperature measurement unit to determine first winding
Temperature and secondary winding temperature；If first winding temperature is less than+10 DEG C of rated temperature, from unsteady flow power switching modules with directly
Galvanic electricity stream heats first winding, until first winding is heated to+10 DEG C of rated temperature；
6) stage is done eventually:
Into after the dry stage eventually, circulation hot gas be will not be used, and control voltage control module discharges air pressure, discharge dry nitrogen into
Enter vacuum tank, completes to be dried.
7. the method that device according to claim 6 carries out the drying process of distribution transformer body, it is characterised in that: described
Heating period I and heating period II in, heating rate control within 1 DEG C/min, to limit the depolymerization of cellulose insulating layer,
Guarantee that non-coil insulating layer part obtains heating appropriate.
8. the method that device according to claim 6 carries out the drying process of distribution transformer body, it is characterised in that: described
Step 2.1) in parameter acquisition unit method that the initial value of transformer first winding and secondary winding is measured such as
Under: transformer T-type equivalent circuit is utilized, transformer is initially controlled to high frequency, low frequency and the direct current of the output of Variable flow control unit
Stream signal is applied in transformer body high-voltage winding, equivalent according to resistance temperature by measuring high pressure, low pressure side resistance respectively
Each winding mean temperature is directly calculated in formula.
9. the method that device according to claim 8 carries out the drying process of distribution transformer body, it is characterised in that: described
Parameter acquisition unit method that the initial value of transformer first winding and secondary winding is measured specifically:
The output signal of Variable flow control unit, control unsteady flow power switching modules output frequency are 300Hz three-phase sine-wave electric current,
It is applied in transformer body high-voltage winding, keeps low-pressure side winding short circuit state, the transformer for calculating one group of current frequency is total
Leakage reactance；The output signal of Variable flow control unit, control unsteady flow power switching modules output frequency are 10Hz three-phase sine-wave electricity
Stream, is applied in transformer body high-voltage winding, keeps low-pressure side winding short circuit state, calculates the transformation of another group of current frequency
This equations simultaneousness is obtained the total leakage inductance of transformer body and total resistance value by the total leakage reactance of device；
The output signal of Variable flow control unit controls unsteady flow power switching modules output single-phase direct current, is applied to transformer body
In high-voltage winding, due to the law of electromagnetic induction, direct current will not be transmitted to low-pressure side, and the low-pressure side mode of connection inputs high-pressure side straight
Stream does not influence；After DC stabilization, input voltage and input current are measured, the resistance value being calculated is single-phase high voltage side electricity
Resistance；It is afterwards that three-phase needs to be divided into three groups of inputs when using single-phase DC signal in the output of unsteady flow power switching modules, surveys
Measure the every phase winding resistance value of high voltage side of transformer A/B/C three-phase；
By alternating current-direct current mode, high-voltage winding resistance and low pressure winding resistance are calculated separately out, recycles temperature and resistance conversion
Formula calculates each winding actual temperature.
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| CN113357901A (en) * | 2021-04-30 | 2021-09-07 | 浙江大唐乌沙山发电有限责任公司 | Automatic drying device and automatic drying method for insulated damp |
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