CN107085161A - A kind of live steady-state short-circuit characteristic test method of large-scale phase modifier transformer group - Google Patents
A kind of live steady-state short-circuit characteristic test method of large-scale phase modifier transformer group Download PDFInfo
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- CN107085161A CN107085161A CN201710294031.6A CN201710294031A CN107085161A CN 107085161 A CN107085161 A CN 107085161A CN 201710294031 A CN201710294031 A CN 201710294031A CN 107085161 A CN107085161 A CN 107085161A
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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 live steady-state short-circuit characteristic test method, belongs to motor test technical field.The present invention is started for large-scale phase modifier using static frequency converter, it can not keep stablizing 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 the problems, such as the live steady-state short-circuit characteristic test of large-scale phase modifier transformer group, significant to the safe efficient of large-scale phase modifier, reliability service and maintenance.
Description
Technical field
The present invention relates to motor field test technical field, the live stable state of specifically a kind of large-scale phase modifier-transformer group
Short-circuit characteristic measurement method.
Background technology
In HVDC, especially extra-high voltage direct-current transmission, either rectification or inverter operation, transverter will be consumed
Substantial amounts of reactive power.To ensure the safe and reliable operation of transverter, the supply of reactive power need to be ensured, reactive power is not enough or
Surplus will directly contribute the unstable of alternating voltage, may jeopardize the safe and stable operation of whole AC and DC system when serious.Cause
This flexible controllable, response quickly dynamic reactive regulating measure is significant to extra-high voltage direct-current transmission.
Large-scale phase modifier, to improving receiving end AC network short-circuit ratio, improves direct current delivery limits work(as reactive generating device
Rate, enhancing grid strength and flexibility have the advantage of uniqueness.Broken down in AC network near-end or converter valve occurs commutation and lost
When losing voltage decline, Large Copacity phase modifier can carry out encouraging support voltage by force and system is stable, is that failure removal wins the quality time；
In the case where straight-flow system hinders and locking occurs or get rid of burden with power suddenly for some reason, leading phase operation state can be entered, absorbed a large amount of
It is superfluous idle, so that suppression system voltage is raised；When normally operation needs regulation voltage to straight-flow system stable state, can it is slow mutually or
Leading phase operation state is supported for the dynamic reactive that AC network provides continuously adjustabe.
After the completion of large-size machine-transformer group steady-state short-circuit experiment is as live units' installation, motor is examined in transport, peace
The important step for the quality problems that may occur during dress, while the O＆M maintenance after being put into operation for motor provides basic data,
To ensuring that the safety of unit is significant.But because 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 to maintain the steady-state short-circuit state under rated speed, it is also not possible to as in system
Make in factory using prime mover drag method carry out steady-state short-circuit characteristic test, add units' installation, the process that puts into operation it is not true
It is qualitative, it is unfavorable for checking unit performance when O＆M is overhauled, it is ensured that clean boot.
The content of the invention
Carry out problem, this hair present in steady-state short-circuit characteristic test 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 the method for phase modifier-transformer group steady-state short-circuit characteristic test under machine running down state, efficiently solve 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 maintenance work
With it is reliable.
The present invention is adopted the following technical scheme that：
The live steady-state short-circuit characteristic test method of a kind of large-scale phase modifier-transformer group, it is characterised in that including following step
Suddenly：
(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, and interim electricity is connect from service power
Cable is to excitation-transformation variable 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 correspondence exciting current value is taken every 10% rated secondary current, stator current is 0,
0.1IN, 0.2IN……IN, corresponding steady-state short-circuit exciting current is If1, If2......If11, totally 11 measuring points, are incited somebody to action
Correspondence steady-state short-circuit exciting current If1, If2......If11Numerical value inputs automatic exciting regulator, is arranged on short-circuit test operating mode
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 3s is stopped under each measuring point, reaches maximum exciting current If11Afterwards, 3s is stopped, then exciting current is dropped
To 0, camera stator current, exciting current, excitation voltage, frequency, the high-precision wave recording device of rotating speed access, set wave recording device as
Continuous wave recording mode；
(3) phase modifier is dragged to 105% rated speed by static frequency converter, disconnects after degaussing switch, close main transformer pressure
Device high-pressure side short switch, starts each parameter waveform of wave recording device start recording, when camera rotating speed is down to rated speed, closes and go out
Exciting current since minimum value, the exciting current of setting is risen to most according to pre-programmed curve by magnetic switch, automatic exciting regulator
Big 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-IfRelation makes the live steady-state short-circuit characteristic curve of phase modifier-transformer group.
Further, the curve that the steady-state short-circuit characteristic curve measured every time after maintenance is measured when being put into operation with new machine does ratio
Compared with, as deviation measurement allowed band in if think qualified, 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 there is obvious cut-off point between short dot and power network.
Present invention firstly provides the flow of the live steady-state short-circuit characteristic test of large-scale phase modifier, secondly in test process
The setting of relevant parameter proposes method, and steady-state short-circuit result of the test is comparable when finally proposing test result with constant frequency
Property so that the method for testing can effectively measure large-scale phase modifier-transformer group steady-state short-circuit characteristic, favourable to ensure equipment in fortune
Quality before and after defeated, installation and maintenance, ensures the safe operation of unit.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of large-scale phase modifier proposed by the present invention-transformer group steady-state short-circuit characteristic test method；
Fig. 2 is a kind of steady-state short-circuit characteristic curve of typical 350MW motors-transformer group.
Embodiment
Below in conjunction with the accompanying 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 live steady-state short-circuit characteristic test method, including following step
Suddenly：
(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, and interim electricity is connect from service power
Cable is to excitation-transformation variable 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 requirement of 1.2 times of rated current, should have obvious cut-off point between short dot and power network.Release breaker adjacent
The interlock protection of disconnecting switch can ensure that breaker can carry out combined floodgate behaviour in the case where breaker disconnects by net side disconnecting switch
Make.Exciting transformer high-pressure side and phase modifier are exported and disconnected, temporary cable is connect to excitation-transformation variable high-pressure side from service power, so
It may insure that power supply capacity meets experiment demand.
(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 correspondence exciting current value is taken every 10% rated secondary current, stator current is 0,
0.1IN, 0.2IN……IN, corresponding steady-state short-circuit exciting current is If1, If2......If11, totally 11 measuring points, are incited somebody to action
Correspondence steady-state short-circuit exciting current If1, If2......If11Numerical value inputs automatic exciting regulator, is arranged on short-circuit test operating mode
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, the time of minimum exciting current to maximum exciting current is 1min, i.e., rising value per second is k=If11/ 60, set simultaneously
It is scheduled under each measuring point and stops 3s, reaches maximum exciting current If11Afterwards, 3s is stopped, exciting current is then dropped to 0 by phase modulation
Machine stator electric current, exciting current, excitation voltage, frequency, the high-precision wave recording device of rotating speed access, set wave recording device as continuous wave
Shape recording mode, retains 3-5s and pre-records waveform.Wherein stator current, exciting current are used directly to do curve, and other specification is used for
It is used as reference.
(3) phase modifier is dragged to 105% rated speed by static frequency converter, disconnects after degaussing switch, close main transformer pressure
Device high-pressure side short switch, start wave recording device start recording each parameter (phase modifier stator current, exciting current, excitation voltage,
Frequency, rotating speed) waveform.When phase modifier rotating speed is down to rated speed, degaussing switch is closed, automatic exciting regulator is by exciting current
Since minimum value, the exciting current maximum of setting is risen to according to pre-programmed curve, exciting current is then downgraded 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-IfRelation can make the live steady-state short-circuit characteristic curve of phase modifier-transformer group, i.e., in running down
The I measured under operating mode by pre-programmed curven-IfRelation curve, wherein InFor phase modifier stator current, IfRepresent what oscillograph was recorded
Exciting current value.
It can be seen from electric machine theory, phase modifier set end voltage, set end voltage frequency, exciting current have as follows at any time
Relation：
E0=4.44fnNkw1Φn(n=1,2 ... 11) (1)
In formula：E0For phase modifier built-in potential；
fnFor phase modifier internal potential frequency；
N is phase modulation machine stator per the phase winding number of turn；
kw1For phase modifier fundamental wave winding coefficient；
ΦnFor certain moment by phase modifier per the magnetic flux virtual value under extremely；
N is n-th of measuring 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；
IfTo produce the exciting curent of 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；
XsFor phase modifier leakage reactance；
And Xs=2 π fnN2μ A (n=1,2 ... 11) (5)
It can be obtained by formula (3) (4) (5)
From formula (5), exciting current I during steady-state short-circuitfWith stator current InFor linear relationship, and turn with phase modifier
Speed and frequency are unrelated, therefore, the I measured under idle conditions by pre-programmed curven-IfRelation curve (is measured) in the case of frequency conversion
Should be consistent with steady-state short-circuit characteristic curve under constant frequency (being measured in the case of constant frequency).Actual field is exactly after maintenance every time
The curve that the curve measured is measured when being put into operation with new machine is compared, and is thought qualified if deviation is in measurement allowed band, is such as gone 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 start wave recording device, automatic exciting regulator detection phase modifier rotating speed whether be
3000rpm (i.e. rated speed), as being not reaching to, is continued waiting for, and exciting current value is adjusted if reaching 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 If11, stop 3s
Exciting current is dropped into 0,11 measurement condition point records afterwards to complete, fitting can obtain phase modifier stator current, exciting current, encourage
Magnetoelectricity pressure, frequency, rotating 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 foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Belong to those skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (5)
1. the live steady-state short-circuit characteristic test method of a kind of large-scale phase modifier-transformer group, it is characterised in that comprise 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
Excitation-transformation variable 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, takes 1 correspondence exciting current value, stator current is 0,0.1I every 10% rated secondary currentN,
0.2IN……IN, corresponding steady-state short-circuit exciting current is If1, If2......If11, totally 11 measuring points, steady by correspondence
State short circuit exciting current If1, If2......If11Numerical value inputs automatic exciting regulator, is arranged on phase modulation under short-circuit test operating mode
When machine reaches rated speed, automatic exciting regulator control exciting current at the uniform velocity rises to maximum since minimum value, simultaneously
It is set under each measuring point and stops 3s, reaches maximum exciting current If11Afterwards, 3s is stopped, exciting current is then dropped into 0, phase
Machine stator electric current, exciting current, excitation voltage, frequency, the high-precision wave recording device of rotating speed access, set wave recording device as continuous wave
Shape recording mode；
(3) phase modifier is dragged to 105% rated speed by static frequency converter, disconnected after degaussing switch, close main transformer high
Side short switch is pressed, starts each parameter waveform of wave recording device start recording, when camera rotating speed is down to rated speed, closes demagnetization and open
Close, exciting current since minimum value, the exciting current maximum of setting is risen to according to pre-programmed curve by automatic exciting regulator,
Then exciting current is downgraded 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 exciting current In-IfRelation makes the live steady-state short-circuit characteristic curve of phase modifier-transformer group.
2. the live steady-state short-circuit characteristic test method of large-scale phase modifier-transformer group as claimed in claim 1, its feature exists
In：Exciting current I during steady-state short-circuitfWith stator current InFor linear relationship, and it is unrelated with phase modifier rotating speed and frequency.
3. the live steady-state short-circuit characteristic test method of large-scale phase modifier-transformer group as claimed in claim 1, its feature exists
In：The curve that the steady-state short-circuit characteristic curve measured every time after maintenance is measured when being put into operation with new machine is compared, and such as deviation is in measurement
It is qualified then to think in allowed band, and set state should be checked using other test methods if there is relatively large deviation.
4. the live steady-state short-circuit characteristic test method of large-scale phase modifier-transformer group as claimed in claim 1, its feature exists
In：Short-circuiting means is road copper bar, shorting stub or earthing knife-switch in step (1).
5. the live steady-state short-circuit characteristic test method of large-scale phase modifier-transformer group as claimed in claim 1, its feature exists
In：Short dot is located at breaker close to net side in step (1), and the through-current capacity of short-circuiting means meets the requirement of 1.2 times of rated current,
There should be obvious cut-off point between short dot and power network.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947215A (en) * | 2017-11-09 | 2018-04-20 | 国网江苏省电力有限公司检修分公司 | Quick voltage stabilizing control method after the synchronized phase modifier compensation of HVDC transmission line |
| CN107947186A (en) * | 2017-11-23 | 2018-04-20 | 国网江苏省电力有限公司检修分公司 | D.C. high voltage transmission inverter side accesses the startup control method of synchronous capacitor |
| 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 |
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN107947186A (en) * | 2017-11-23 | 2018-04-20 | 国网江苏省电力有限公司检修分公司 | D.C. high voltage transmission inverter side accesses the startup control method of synchronous capacitor |
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| 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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Inventor after: Cui Yibo Inventor after: Liu Manjia Inventor after: Ling Zaixun Inventor after: Tao Jian Inventor after: Cai Wanli Inventor after: Wang Shaowu Inventor after: Yang Pengcheng Inventor after: Chen Nianbin Inventor after: Zheng Jingwen Inventor after: Ruan Ling Inventor before: Cui Yibo Inventor before: Ling Zaixun Inventor before: Tao Jian Inventor before: Cai Wanli Inventor before: Chen Nianbin Inventor before: Zheng Jingwen Inventor before: Ruan Ling Inventor before: Liu Manjia |