CN107085161B - A kind of large size phase modifier-transformer group scene steady-state short-circuit characteristic test method - Google Patents
A kind of large size phase modifier-transformer group scene steady-state short-circuit characteristic test method Download PDFInfo
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- CN107085161B CN107085161B CN201710294031.6A CN201710294031A CN107085161B CN 107085161 B CN107085161 B CN 107085161B CN 201710294031 A CN201710294031 A CN 201710294031A CN 107085161 B CN107085161 B CN 107085161B
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- 238000010998 test method Methods 0.000 title claims abstract description 15
- 239000003607 modifier Substances 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000013632 homeostatic process Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000005347 demagnetization Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
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- 238000000691 measurement method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
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Classifications
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
The present invention provides a kind of large-scale phase modifier-transformer group scene steady-state short-circuit characteristic test method, belongs to motor test technical field.The present invention is directed to large-scale phase modifier and is started using static frequency converter, it cannot keep stable rated speed short-circuit condition, the problem of leading to not conventionally testing large phase modifier-transformer group steady-state short-circuit characteristic, one kind is proposed under running down state, the method for carrying out steady-state short-circuit characteristic test.This method can effectively solve large-scale phase modifier-transformer group scene steady-state short-circuit characteristic test problem, be of great significance to the safe and efficient of large-scale phase modifier, reliability service and maintenance.
Description
Technical field
The present invention relates to motor field test technical field, specifically a kind of large size phase modifier-transformer group scene stable state
Short-circuit characteristic measurement method.
Background technique
In high voltage direct current, especially extra-high voltage direct-current transmission, either rectification or inverter operation, inverter will be consumed
A large amount of reactive power.For the safe and reliable operation for guaranteeing inverter, need to guarantee the supply of reactive power, reactive power is insufficient or
Surplus will directly contribute the unstable of alternating voltage, may jeopardize the safe and stable operation of entire AC and DC system when serious.Cause
This is flexibly controllable, the dynamic reactive regulating measure of response quickly is significant to extra-high voltage direct-current transmission.
Large-scale phase modifier, to receiving end AC network short-circuit ratio is improved, improves direct current delivery limits function as reactive generating device
Rate, enhancing grid strength and flexibility has unique advantage.It breaks down in AC network proximal end or converter valve occurs commutation and loses
When losing voltage decline, large capacity phase modifier can be encouraged by force support voltage and system is stablized, and win the quality time for failure removal；
In the case where direct current system occurs being latched or getting rid of burden with power suddenly because of failure, leading phase operation state can be entered, absorbed a large amount of
It is superfluous idle, so that system voltage be inhibited to increase；When direct current system stable state normal operation needs to adjust voltage, can it is slow mutually or
Leading phase operation state provides continuously adjustable dynamic reactive for AC network and supports.
After the completion of large-size machine-transformer group steady-state short-circuit test is as live units' installation, examine motor in transport, peace
The important link for the quality problems that may occur during dress, while the O&M after putting into operation for motor overhauls and provides basic data,
It is of great significance to the safety for ensuring unit.But since large-scale phase modifier is to be dragged to specified turn using variable frequency starting system
Speed, both unlike traditional fired power generating unit has steam turbine that can maintain the steady-state short-circuit state under rated speed, it is also not possible to as making
Make in factory using prime mover dragging method carry out steady-state short-circuit characteristic test, increase units' installation, the process that puts into operation not really
It is qualitative, it is unfavorable for checking unit performance when O&M overhauls, it is ensured that clean boot.
Summary of the invention
Carry out problem present in steady-state short-circuit characteristic test, this hair at the scene for above-mentioned large-scale phase modifier-transformer group
The bright one kind that provides is by setting automatic exciting regulator control mode, and main transformer circuit breaker presets short dot, in large-scale phase modulation
Carry out phase modifier-transformer group steady-state short-circuit characteristic test method under machine running down state, efficiently solves live steady-state short-circuit
The problem of characteristic test, it is ensured that be also unit to the validity of quality examination in motor transport, installation process before newly machine puts into operation
O&M maintenance and preventive trial after putting into operation provide practical ways, have ensured the efficient of unit operation and maintenance
With it is reliable.
The present invention adopts the following technical scheme:
A kind of large size phase modifier-transformer group scene steady-state short-circuit characteristic test method, it is characterised in that including walking as follows
It is rapid:
(1) phase modifier step-up transformer high-pressure side circuit breaker short circuit is released into open circuit in the controls with short-circuiting means
The interlock protection of the adjacent disconnecting switch of device, disconnects enclosed busbar in exciting transformer high-pressure side, connects interim electricity from service power
Cable is to exciting transformer high-pressure side；
(2) according to phase modifier manufactory homeostasis short circuit curve test report, exciting current value when looking into steady-state short-circuit, from 0
To 100% rated secondary current, 1 corresponding exciting current value is taken every 10% rated secondary current, stator current 0,
0.1IN, 0.2IN……IN, corresponding steady-state short-circuit exciting current is If1, If2......If11, totally 11 record points, are incited somebody to action
Corresponding steady-state short-circuit exciting current If1, If2......If11Numerical value inputs automatic exciting regulator, is arranged in short-circuit test operating condition
When lower phase modifier reaches rated speed, automatic exciting regulator control exciting current at the uniform velocity rises to maximum since minimum value
Value, concurrently sets and stops 3s under each record point, reaches maximum exciting current If11Afterwards, 3s is stopped, then drops exciting current
To 0, phase modifier stator current, exciting current, excitation voltage, frequency, revolving speed access wave recording device, and it is continuous for setting wave recording device
Waveform recording mode；
(3) phase modifier is dragged to 105% rated speed by static frequency converter, after disconnecting degaussing switch, closes main transformer pressure
Device high-pressure side short switch, starting each parameter waveform of wave recording device start recording close when phase modifier revolving speed is down to rated speed
Exciting current since minimum value, the exciting current of setting is risen to according to pre-programmed curve by degaussing switch, automatic exciting regulator
Maximum value then downgrades exciting current to 0；
(4) degaussing switch is disconnected, main transformer high side switch is disconnected, stops wave recording device recording process, by phase modifier
Stator current and exciting current In-IfRelationship makes phase modifier-transformer group scene steady-state short-circuit characteristic curve.
Further, the curve that the steady-state short-circuit characteristic curve and new machine measured after maintenance every time measures when putting into operation does ratio
Compared with thinking qualified if deviation is in measurement allowed band, other test method check machines should be used if there is relatively large deviation
Group state.
Further, short-circuiting means is road copper bar, shorting stub or earthing knife-switch in step (1).
Further, short dot is located at breaker close to net side in step (1), and the through-current capacity of short-circuiting means meets 1.2 times
The requirement of rated current should have obvious cut-off point between short dot and power grid.
Present invention firstly provides the processes of large-scale phase modifier scene steady-state short-circuit characteristic test, secondly in test process
The setting of relevant parameter proposes method, finally propose test result with when constant frequency steady-state short-circuit test result it is comparable
Property, enable the test method effectively to measure large-scale phase modifier-transformer group steady-state short-circuit characteristic, it is advantageous to guarantee that equipment is being transported
The quality of defeated, installation and maintenance front and back, ensures the safe operation of unit.
Detailed description of the invention
Fig. 1 is the flow diagram of large-scale phase modifier-transformer group steady-state short-circuit characteristic test method proposed by the present invention；
Fig. 2 is a kind of steady-state short-circuit characteristic curve of typical case 350MW motor-transformer group.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, the test process in the present invention is clearly and completely described.
The present invention provides a kind of large-scale phase modifier-transformer group scene steady-state short-circuit characteristic test method, including walks as follows
It is rapid:
(1) phase modifier step-up transformer high-pressure side circuit breaker short circuit is released into open circuit in the controls with short-circuiting means
The interlock protection of the adjacent disconnecting switch of device, disconnects enclosed busbar in exciting transformer high-pressure side, connects interim electricity from service power
Cable is to exciting transformer high-pressure side.Short dot is located at breaker close to net side, short-circuiting means (such as short-circuiting copper bar, shorting stub or
Earthing knife-switch) through-current capacity should meet the requirements of 1.2 times of rated current, should have obvious cut-off point between short dot and power grid.Release open circuit
The interlock protection of the adjacent disconnecting switch of device can ensure that breaker can carry out in the case where breaker is disconnected by net side disconnecting switch
Closing operation.Exciting transformer high-pressure side and phase modifier outlet are disconnected, connect temporary cable to exciting transformer from service power
High-pressure side may insure that power supply capacity meets test demand in this way.
(2) according to phase modifier manufactory homeostasis short circuit curve test report, exciting current value when looking into steady-state short-circuit, from 0
To 100% rated secondary current, 1 corresponding exciting current value is taken every 10% rated secondary current, stator current 0,
0.1IN, 0.2IN……IN, corresponding steady-state short-circuit exciting current is If1, If2......If11, totally 11 record points, are incited somebody to action
Corresponding steady-state short-circuit exciting current If1, If2......If11Numerical value inputs automatic exciting regulator, is arranged in short-circuit test operating condition
When lower phase modifier reaches rated speed, automatic exciting regulator control exciting current at the uniform velocity rises to since minimum value (i.e. 0)
Maximum value, the time of minimum exciting current to maximum exciting current are 1min, i.e., rising value per second is k=If11/ 60, it sets simultaneously
It is scheduled on stop 3s under each record point, reaches maximum exciting current If11Afterwards, 3s is stopped, exciting current is then dropped to 0 for phase modulation
Machine stator electric current, exciting current, excitation voltage, frequency, revolving speed access wave recording device, set wave recording device and record as continuous wave
Mode retains 3-5s and pre-records waveform.Wherein stator current, exciting current are used directly to do curve, and other parameters are used as joining
It examines.
(3) phase modifier is dragged to 105% rated speed by static frequency converter, after disconnecting degaussing switch, closes main transformer pressure
Device high-pressure side short switch, starting each parameter of wave recording device start recording (phase modifier stator current, exciting current, excitation voltage,
Frequency, revolving speed) waveform.When phase modifier revolving speed is down to rated speed, degaussing switch is closed, automatic exciting regulator is by exciting current
Since minimum value, the exciting current maximum value of setting is risen to according to pre-programmed curve, then downgrades exciting current to 0.
(4) degaussing switch is disconnected, main transformer high side switch is disconnected, stops wave recording device recording process, by phase modifier
Stator current and exciting current In-IfRelationship can make phase modifier-transformer group scene steady-state short-circuit characteristic curve, i.e., in running down
The I measured under operating condition by pre-programmed curven-IfRelation curve, wherein InFor phase modifier stator current, IfIndicate what oscillograph was recorded
Exciting current value.
According to electric machine theory it is found that at any time phase modifier set end voltage, set end voltage frequency, exciting current have it is as follows
Relationship:
E0=4.44fnNkw1Φn(n=1,2 ... 11) (1)
In formula: E0For phase modifier built-in potential；
fnFor phase modifier internal potential frequency；
N is the every phase winding the number of turns of phase modulation machine stator；
kw1For phase modifier fundamental wave winding coefficient；
ΦnFor certain moment by phase modifier it is every extremely under magnetic flux virtual value；
N is n-th of record point；
ΦnIt can be stated by following formula:
In formula: μ is magnetic conductivity；
A is the effective area that magnetic flux density passes through；
L is magnetic circuit average length；
IfFor the excitation current for generating magnetic flux, as phase modifier rotor excitation current；
By formula (1) (2) Shi Ke get:
And in steady-state short-circuit:
In formula: InFor phase modifier stator current；
XσFor phase modifier leakage reactance；
And Xσ=2 π fnN2μ A (n=1,2 ... 11) (5)
It can be obtained by formula (3) (4) (5)
By formula (5) it is found that exciting current I when steady-state short-circuitfWith stator current InFor linear relationship, and turn with phase modifier
Speed is unrelated with frequency, therefore, the I measured under idle conditions by pre-programmed curven-IfRelation curve (measures) in frequency conversion
It should be consistent with steady-state short-circuit characteristic curve under constant frequency (being measured in constant frequency).Actual field is exactly after maintenance every time
The curve that the curve measured measures when putting into operation with new machine compares, and thinks qualified if deviation is in measurement allowed band, such as goes out
Existing relatively large deviation then should check set state using other test methods.
As shown in Figure 1, when it is implemented, first start automatic exciting regulator steady-state short-circuit characteristic test program, close
Main transformer high-pressure side breaker, while starting wave recording device, automatic exciting regulator detection phase modifier revolving speed whether be
3000rpm (i.e. rated speed) is continued waiting for if do not reached, and if reached, adjusts exciting current value to If1, and maintain 3s.
Then, exciting current value is at the uniform velocity adjusted to If2, stop 3s.So continue, until exciting current reaches maximum value If11, stop 3s
Exciting current is dropped to 0,11 measurement condition point records afterwards to complete, fitting can be obtained phase modifier stator current, exciting current, encourage
Magnetoelectricity pressure, frequency, revolving speed versus time curve.
According to stator current and exciting current In-IfnRelation curve can draw phase modifier steady-state short-circuit characteristic curve, such as Fig. 2
It is shown.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (4)
1. a kind of large size phase modifier-transformer group scene steady-state short-circuit characteristic test method, it is characterised in that include the following steps:
(1) phase modifier step-up transformer high-pressure side circuit breaker short circuit is released into breaker phase in the controls with short-circuiting means
The interlock protection of adjacent disconnecting switch disconnects enclosed busbar in exciting transformer high-pressure side, from service power connect temporary cable to
Exciting transformer high-pressure side；
(2) according to phase modifier manufactory homeostasis short circuit curve test report, exciting current value when looking into steady-state short-circuit, from 0 to
100% rated secondary current IN, exciting current value when 10% rated secondary current takes 1 corresponding steady-state short-circuit, stator electricity
Flow InIt is 0,0.1IN, 0.2IN……IN, corresponding steady-state short-circuit exciting current IfFor If1, If2......If11, totally 11
Point is recorded, by corresponding steady-state short-circuit exciting current If1, If2......If11Numerical value inputs automatic exciting regulator, is arranged in short circuit
When phase modifier reaches rated speed under operating condition of test, automatic exciting regulator control exciting current at the uniform velocity rises since minimum value
It to maximum value, concurrently sets and stops 3s under each record point, reach maximum steady state short circuit exciting current If11Afterwards, 3s is stopped, with
Exciting current is dropped to 0 afterwards, phase modifier stator current, exciting current, excitation voltage, frequency, revolving speed access wave recording device, setting
Wave recording device is continuous wave recording mode；
(3) phase modifier is dragged to 105% rated speed by static frequency converter, after disconnecting degaussing switch, closes main transformer height
Side short switch is pressed, starting each parameter waveform of wave recording device start recording closes demagnetization when phase modifier revolving speed is down to rated speed
Switch, for automatic exciting regulator by exciting current since minimum value, the exciting current for rising to setting according to pre-programmed curve is maximum
Value, then downgrades exciting current to 0；
(4) degaussing switch is disconnected, main transformer high side switch is disconnected, stops wave recording device recording process, by phase modulation machine stator
Electric current and corresponding steady-state short-circuit exciting current In-IfIt is bent that relationship makes phase modifier-transformer group scene steady-state short-circuit characteristic
Line.
2. large size phase modifier-transformer group scene steady-state short-circuit characteristic test method as described in claim 1, feature exist
In: steady-state short-circuit exciting current IfWith stator current InFor linear relationship, and it is unrelated with phase modifier revolving speed and frequency.
3. large size phase modifier-transformer group scene steady-state short-circuit characteristic test method as described in claim 1, feature exist
In: the curve that the steady-state short-circuit characteristic curve measured after maintenance every time measures when putting into operation with new machine compares, as deviation is measuring
Then think qualified in allowed band, should check set state using other test methods if there is relatively large deviation.
4. large size phase modifier-transformer group scene steady-state short-circuit characteristic test method as described in claim 1, feature exist
In: short-circuiting means is road copper bar, shorting stub or earthing knife-switch in step (1).
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| CN107947215B (en) * | 2017-11-09 | 2021-06-15 | 国网江苏省电力有限公司检修分公司 | Rapid voltage stabilization control method of high-voltage direct current transmission line after compensation of synchronous phase modulator |
| CN109782162A (en) * | 2017-11-15 | 2019-05-21 | 中国电力科学研究院有限公司 | A kind of phase modifier fracture breaker arcing fault dynamic simulator system and method |
| CN107947186B (en) * | 2017-11-23 | 2021-06-18 | 国网江苏省电力有限公司检修分公司 | Starting control method for accessing high-voltage direct-current transmission inversion side to synchronous phase modulator |
| CN111007429A (en) * | 2019-11-26 | 2020-04-14 | 国网江苏省电力有限公司检修分公司 | ANFIS-based synchronous phase modulator short-circuit fault identification method and system |
| CN110836696A (en) * | 2019-12-04 | 2020-02-25 | 江苏方天电力技术有限公司 | Remote fault prediction method and system suitable for phase modulator system |
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