CN108828439A - A kind of emulation of load ratio bridging switch transition resistance failure and diagnostic method and system - Google Patents
A kind of emulation of load ratio bridging switch transition resistance failure and diagnostic method and system Download PDFInfo
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- CN108828439A CN108828439A CN201810553109.6A CN201810553109A CN108828439A CN 108828439 A CN108828439 A CN 108828439A CN 201810553109 A CN201810553109 A CN 201810553109A CN 108828439 A CN108828439 A CN 108828439A
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Abstract
This application discloses a kind of emulation of load ratio bridging switch transition resistance failure and diagnostic method and systems, including：1) single-phase on-load regulator transformer model is built under the Simulink environment in matlab, in case the simulation analysis of subsequent tap switch handoff procedure；2) parameter setting is carried out to the modules of on-load regulator transformer model；3) the transition resistance damaged condition of tap switch is simulated respectively, observes the situation of change of transformer primary side current；4) tap switch transition resistance state is identified by the situation of change that transformer primary side current is compared in analysis.Through simulation analysis it is found that the application, which diagnoses transition resistance, can obtain preferably effect.
Description
Technical field
The invention belongs to transformer detection technique fields, are related to on-load tap changers of transformers transition resistance fault diagnosis skill
The emulation of art more particularly to a kind of load ratio bridging switch transition resistance failure and diagnostic method and system.
Background technique
Core component one of of the on-load tap changers of transformers OLTC as transformer plays stablize in the power system
Load center voltage adjusts reactive power flow, increases the important function such as dispatching of power netwoks flexibility.
Load ratio bridging switch is in the working condition of continually on-load pressure regulation as a kind of online dynamic apparatus, though
So usually there is the mechanical life of movement hundreds of thousands time, but influenced by material, technique and load weight, failure rate is becoming
Ratio in the total accident of depressor is relatively high.Pendant-core examination is discovery load ratio bridging switch internal flaw most straightforward approach, but
It is that thus can generate economic loss, therefore, conventional preventive trial is being reinforced examining load ratio bridging switch latent defect exception
Disconnected monitoring, improves important in inhibiting in terms of Operation of Electric Systems reliability.
Traditional preventive trial can only measuring transformer whether good contacted before and after tap switching, whether insulation performance
Deterioration, is but unable to monitor the mechanical property of load ratio bridging switch transient process.By imitating load ratio bridging switch acting characteristic
Very, the parameters such as transit time, transition waveform, the transition resistance of load ratio bridging switch are analyzed, timely and effectively whether can judge it
There are latent defects and failure.
And traditional transition resistance fault detection, typically by test load ratio bridging switch switching waveform, by its with
Reference waveform comparison, to carry out transition resistance fault diagnosis, but since tap switch scene is complicated, obtained test waveform is abnormal
Become very serious, there is a certain error with reference waveform comparison.Therefore, the application from transformer primary side current transfer the files front and back
Variation and the variation of transformer primary side transition waveform carry out the fault diagnosis of transition resistance.
Summary of the invention
To solve deficiency in the prior art, the application provide a kind of load ratio bridging switch transition resistance failure emulation and
Diagnostic method and system, diagnosis effect is good, and algorithm is simple, can have strong operability.
In order to achieve the above objectives, first invention of the application adopts the following technical scheme that：
A kind of emulation of load ratio bridging switch transition resistance failure and diagnostic method, which is characterized in that described includes following
Step：
Step 1：Build single-phase on-load regulator transformer model；
Step 2：Parameter setting is carried out to the modules for the single-phase on-load regulator transformer model that step 1 is built,
Described in modules include：AC power supply module, step-up transformer module, load ratio bridging switch module, the single-phase change of Multiple coil
Depressor module, secondary side voltage acquisition module, primary side current acquisition module；
Step 3：The load ratio bridging switch transition resistance damaged condition of single-phase on-load regulator transformer is simulated, observation is single-phase to be had
The situation of change of voltage adjustment of on-load transformer primary side current；Step 4：Pass through the transition waveform width in transformer primary side current waveform
Value, the variation of time carry out condition diagnosing to load ratio bridging switch transition resistance.
The present invention further comprises following preferred embodiment：
In step 1, single-phase on-load regulator transformer model is built under Simulink environment in matlab：
Alternating current generator generates sinusoidal ac, and input single-phase on-load regulator transformer is primary after step-up transformer
Side, the movement by simulating load ratio bridging switch carry out pressure regulation.
In step 1, load ratio bridging switch module is installed in the primary side of single-phase on-load regulator transformer, it is single-phase to have load
Adjustable transformer model is obtained by the multiwinding transformer model for setting tap that matlab software carries by parameter setting.
In matlab, 2 taps are set by multiwinding transformer model.
On-load regulator transformer load ratio bridging switch module includes timing sequencer unit, thyristor cell, First Transition
Resistance R1, the second transition resistance R2 composition；2 tap is the on-load regulator transformer adjacent taps of simulation；Wherein first take out
Head is connected to the first thyristor by first lead, is connected to the second thyristor by First Transition resistance R1；Second tap point
Third thyristor is not connected to by the second transition resistance, the 4th thyristor is connected to by the second lead；Described first to
Four thyristors control on-off by timing sequencer.
In step 2, the modules progress parameter setting to single-phase on-load regulator transformer model includes：
Setting to AC power supply module, including voltage value, frequency and phase；
Setting to step-up transformer module, including number of taps, reactance, resistance, voltage and frequency；
Setting to single-phase on-load regulator transformer module, including number of taps, reactance, resistance, voltage and frequency；
Setting to load ratio bridging switch module, including transition resistance resistance value, switching time.
Load ratio bridging switch module includes timing sequencer unit, thyristor cell, First Transition resistance R1, the second transition
Resistance R2；
Setting to thyristor switch includes to First Transition resistance R1, the second transition resistance R2 and timing sequencer unit
Timing setting.
In step 3, the transition resistance damaged condition to tap switch, which carries out simulating respectively, includes：
Two transition resistances of load ratio bridging switch module normal condition simulation, one of transition resistance scaling loss simulation with
And the simulation of two transition resistances while scaling loss.
Wherein transition resistance scaling loss that is to say infinite using open circuit simulation；
In all normal situation of two transition resistances, two transition resistance parallel connections, the resistance value for being connected into circuit is R/2；
When one of transition resistance scaling loss, then the resistance value for being connected into circuit is R；
When two transition resistances scaling loss simultaneously, then the resistance value of circuit is connected into as infinity；
Wherein R=R1=R2.
In step 3, first under normal condition according to modeling tap switch transition resistance, before transformer is transferred the files
Afterwards, the variation of transformer primary side current；
Then it the case where the damage of simulation tap switch one of transition resistance, then observes transformer and transfers the files front and back primary side
The situation of change of electric current；
Finally, simulation two transition resistances of tap switch the case where being in damage simultaneously, observation transformer is transferred the files front and back one
The situation of change of secondary side electric current.
In step 4, according in transformer primary side current transition waveforms amplitude and the time judge transition resistance therefore
Barrier state, specially：When occurring the case where amplitude is 0 in transition waveform, then failure has occurred in the transition resistance of tap switch,
It is i.e. in damaged condition；
Detect transition waveform occur amplitude be 0 on the basis of, then observe transition waveforms amplitude it is lasting for 0 when
Between, that is, it can determine whether the fault degree of transition resistance, i.e. a transition resistance breaks down or two transition resistances while occurring
Failure：
When transition waveforms amplitude is 0 duration≤T1, then explanation has a transition resistance to break down；Work as T>It crosses
Cross the duration that waveforms amplitude is 0>T1 then illustrates that failure all has occurred in two transition resistances.
Wherein, T1 is the access circuit time of single transition resistance, and T is the switching time of tap switch transition resistance.
The switching time T of tap switch transition resistance is different according to the difference of tap switch model, and the value of T exists
Between 40ms-60ms；
Individually the value of the time T1 of transition resistance access circuit is：3ms≤T1≤7ms, preferably 15ms.
Disclosed herein as well is another inventions, i.e., the emulation of load ratio bridging switch transition resistance and event based on preceding method
Hinder diagnostic system, it is characterised in that：
The load ratio bridging switch transition resistance emulation and fault diagnosis system include AC power supply module, step-up transformer
Module, load ratio bridging switch module, Multiple coil single-phase transformer module, secondary side voltage acquisition module, primary side current acquisition
Module；
The AC power supply module uses the form of alternating current generator, generates sinusoidal ac by alternating current generator, even
It is connected to the primary side of step-up transformer module；
The secondary side of the step-up transformer module is connected to the single-phase change of Multiple coil after passing through primary side current acquisition module
Depressor module primary side, the primary side current acquisition module are used to measure the primary current of Multiple coil single-phase transformer；
The secondary side voltage acquisition module is connected to the secondary side of Multiple coil single-phase transformer module, for acquire mostly around
The secondary voltage of group single-phase transformer module；
The load ratio bridging switch module is installed in the primary side of Multiple coil single-phase transformer module, will by parameter setting
Multiwinding transformer model is for simulating single-phase on-load regulator transformer.
Further, the on-load regulator transformer load ratio bridging switch module includes timing sequencer unit, thyristor list
Member, First Transition resistance R1, the second transition resistance R2；
2 taps are set by multiwinding transformer model, wherein the first tap is connected to the first brilliant lock by first lead
Pipe, is connected to the second thyristor by First Transition resistance R1；Second tap passes through the second transition resistance respectively and is connected to third
Thyristor is connected to the 4th thyristor by the second lead；First to fourth thyristor is controlled logical by timing sequencer
It is disconnected.
The emulation and fault diagnosis system further include current oscilloscope, and the current oscilloscope and primary side current acquire
The output end of module is connected, for showing the single-phase on-load regulator transformer primary current waveform simulated.
The emulation and fault diagnosis system further include voltage oscilloscope, the voltage oscilloscope and secondary side voltage acquisition
The output end of module is connected, for showing the secondary voltage waveform for the single-phase on-load regulator transformer simulated.
The application beneficial effect achieved：
1. the application provides new thinking for tap switch transition resistance fault diagnosis；
2. tap switch transition resistance fault diagnosis can be effectively performed in the application；
3. the application is simple, reliably, engineer application is strong.
Detailed description of the invention
Fig. 1 is the working principle diagram of tap switch transient process；
Fig. 2 is the single-phase on-load regulator transformer model schematic that the present invention is built；
Fig. 3 is diagnosis and its emulation mode flow diagram of load ratio bridging switch transition resistance failure of the present invention；
Fig. 4 is the change curve of single-phase adjustable transformer primary side current under normal condition；
Fig. 5 is the change curve of single-phase adjustable transformer primary side current under a transition resistance scaling loss；
Fig. 6 is the change curve of single-phase adjustable transformer primary side current under two transition resistance scaling loss.
Wherein, the meaning that attached drawing 2 marks is as follows：1 is AC power source, and 2 be step-up transformer module, and 3 is primary for transformer
Side current acquisition unit, 4 be single-phase multiwinding transformer module, and 5 be secondary side voltage acquisition unit, and S1 is current oscilloscope,
S2 is voltage oscilloscope, and 6-9 is timing sequencer, and R1 and R2 are transition resistance, and K1 and K2 are to represent the thyristor of main contact to open
It closes, M1 and M2 are the thyristor switch for representing auxiliary contact.
Specific embodiment
The application is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and cannot be used as a limitation limitation the application protection scope.
Fig. 1 is tap switch transient process, wherein K1 and K2 is that main contact, M1 and M2 are auxiliary contact, and R1 and R2 were
Cross resistance.For convenience of understanding, it is first illustrated with reference to Fig. 1 the transient process working principle of tap switch below：
(1) switching switch first connects K1, M1, then disconnects K1, transition resistance R1Load circuit is accessed, sees Fig. 1 a~c.
(2) switching switch first connects M1, M2, short circuiting transfer resistance R1、R2Load circuit is accessed, is existed in two transition resistances
Circulation is shown in Fig. 1 d.
(3) switching switch disconnects M1, first connects transition resistance R1Load circuit is accessed, then is shorted M2, K1, is finally disconnected
M2, Fig. 1 e~g.
The emulation and diagnostic method invention of the load ratio bridging switch transition resistance failure of the application pass through to shown in FIG. 1 point
It connects switching transients to be simulated, to provide diagnosis and its emulation side of a kind of load ratio bridging switch transition resistance failure
Method, as shown in Fig. 3, the diagnosis of load ratio bridging switch transition resistance failure disclosed by the invention and its emulation mode include following
Step：
Step 1：Single-phase on-load regulator transformer model is built under Simulink environment in matlab, in case subsequent
The simulation analysis of tap switch handoff procedure；
As shown in Fig. 2, single-phase on-load regulator transformer model includes：AC power source 1, step-up transformer module 2, transformation
Device primary side current acquisition unit 3, single-phase multiwinding transformer module 4, secondary side voltage acquisition unit 5, current oscilloscope S1,
Voltage oscilloscope S2, timing sequencer 6-9, transition resistance R1 and R2 represent the thyristor switch K1 and K2 of main contact, represent auxiliary
Help the thyristor switch M1 and M2 of contact.
Alternating current generator generates sinusoidal ac 1, the input single-phase on-load regulator transformer 4 after step-up transformer 2
Primary side, the movement by simulating load ratio bridging switch carry out pressure regulation.
In embodiments of the present invention, 2 taps are set by multiwinding transformer model 2.
On-load regulator transformer load ratio bridging switch module include timing sequencer unit 6-9, thyristor cell K1-K2 with
And M1-M2, First Transition resistance R1, the second transition resistance R2 composition；2 tap is that the on-load regulator transformer of simulation is adjacent
Tap；Wherein the first tap is connected to the first thyristor K1 by first lead, is connected to second by First Transition resistance R1
Thyristor M1；Second tap passes through the second transition resistance respectively and is connected to third thyristor M2, is connected to by the second lead
Four thyristor K2；First to fourth thyristor controls on-off by timing sequencer 6-9.
Secondary side voltage acquisition module includes the secondary side voltage for acquiring Multiple coil single-phase transformer module secondary side voltage
Acquisition unit 5 and voltage oscilloscope S2.
Primary side current acquisition module includes the current acquisition unit 3 for acquiring Multiple coil single-phase transformer module primary current
With current oscilloscope S1.
Step 2：Parameter setting is carried out to the modules of on-load regulator transformer model；
Setting to AC power supply module 1, including voltage value, frequency and phase；
Setting to step-up transformer module 2, including number of taps, reactance, resistance, voltage and frequency；
Setting to single-phase on-load regulator transformer module 4, including number of taps, reactance, resistance, voltage and frequency；
Setting to load ratio bridging switch module, including transition resistance resistance value, switching time.
Load ratio bridging switch module includes timing sequencer unit 6-9, thyristor cell K1-K2 and M1-M2, the first mistake
Cross resistance R1, the second transition resistance R2；
Setting to thyristor switch K1-K2 and M1-M2 include to First Transition resistance R1, the second transition resistance R2 and
The timing of timing sequencer unit 6-9 is arranged.Step 3：The transition resistance damaged condition of tap switch is simulated respectively；
Two transition resistances of load ratio bridging switch module normal condition simulation, one of transition resistance scaling loss simulation with
And the simulation of two transition resistances while scaling loss.
Wherein transition resistance scaling loss that is to say infinite using open circuit simulation；
In all normal situation of two transition resistances, two transition resistance parallel connections, the resistance value for being connected into circuit is R/2.When
When one of transition resistance scaling loss, then the resistance value for being connected into circuit is R；
When two transition resistances scaling loss simultaneously, then the resistance value of circuit is connected into as infinity；
Wherein R=R1=R2.
Step 4：The ratio for front and back amplitude of being transferred the files by transformer primary side current and the change of transition waveforms amplitude, time
Change, condition diagnosing is carried out to tap switch transition resistance.
In step 4, according in transformer primary side current transition waveforms amplitude and the time judge transition resistance therefore
Barrier state, specially：When occurring the case where amplitude is 0 in transition waveform, then failure has occurred in the transition resistance of tap switch,
It is i.e. in damaged condition；On the basis of detecting transition waveform amplitude occur be 0, then observes transition waveforms amplitude and held by 0
The continuous time can determine whether the fault degree of transition resistance, i.e. a transition resistance breaks down or two transition resistances are same
When break down.
When transition waveforms amplitude is 0 duration=T1, then explanation has a transition resistance to break down；Work as T>It crosses
Cross the duration that waveforms amplitude is 0>T1 then illustrates that failure all has occurred in two transition resistances.
Here T is total switching time, different according to the difference of tap switch model, is generally existed
Between 40ms-60ms, the present invention takes 45ms；T1 is the time that single transition resistance accesses circuit, general 3ms≤T1
≤ 7ms, the present invention take 15ms.
As shown in figure 4, in all normal situation of two transition resistances, the situation of change of transformer primary side current, by
Fig. 4 is it is found that the amplitude of transition waveform is very big compared with the current amplitude of switching front and back.
As shown in figure 5, in the case where for a transition resistance damage, the situation of change of transformer primary side current, by Fig. 5
It is found that there is the case where amplitude is 0 in the amplitude of transition waveform, as soon as this is because there is a transition resistance damage, also open circuit is drawn
It rises, the duration that amplitude is 0 is 10.840ms.
As shown in fig. 6, in the case where all being damaged for two transition resistances, the situation of change of transformer primary side current, by
Fig. 6 is it is found that the case where amplitude is 0 occurs in the amplitude of transition waveform, and the duration is longer, this is because two transition resistances
Damage, also just caused by open circuit, the duration that amplitude is 0 is 31.484ms.
Thus, it is possible to find out, when tap switch is in different states, the amplitude of transition waveform and time can not yet
Together.It therefore, can be using the amplitude of transition waveform and time as the foundation for judging transition resistance state.
As shown in Fig. 2, the load ratio bridging switch transition resistance emulation based on preceding method that disclosed herein as well is a kind of
And fault diagnosis system, the load ratio bridging switch transition resistance emulation and fault diagnosis system include AC power supply module, rise
Pressure transformer module, load ratio bridging switch module, Multiple coil single-phase transformer module, secondary side voltage acquisition module, primary side
Current acquisition module.
The AC power supply module uses the form of alternating current generator, generates sinusoidal ac by alternating current generator, even
It is connected to the primary side of step-up transformer module；Current oscilloscope is connected with the output end of primary side current acquisition module, is used for
Show the single-phase on-load regulator transformer primary current waveform simulated.
The secondary side of the step-up transformer module is connected to the single-phase change of Multiple coil after passing through primary side current acquisition module
Depressor module primary side, the primary side current acquisition module are used to measure the primary current of Multiple coil single-phase transformer；It will be electric
Pressure oscillograph is connected with the output end of secondary side voltage acquisition module, for showing the single-phase on-load regulator transformer simulated
Secondary voltage waveform.
The secondary side voltage acquisition module is connected to the secondary side of Multiple coil single-phase transformer module, for acquire mostly around
The secondary voltage of group single-phase transformer module；The load ratio bridging switch module is installed in the one of Multiple coil single-phase transformer module
Multiwinding transformer model is used to simulate single-phase on-load regulator transformer by parameter setting by secondary side.
Wherein, the on-load regulator transformer load ratio bridging switch module include timing sequencer unit, thyristor cell,
First Transition resistance R1, the second transition resistance R2；2 taps are set by multiwinding transformer model, wherein the first tap passes through
First lead is connected to the first thyristor, is connected to the second thyristor by First Transition resistance R1；Second tap passes through respectively
Second transition resistance is connected to third thyristor, is connected to the 4th thyristor by the second lead；Described first to fourth brilliant lock
Pipe controls on-off by timing sequencer.
Embodiment：
The present invention is opened by simulating to tap switch transient process shown in FIG. 1 to provide a kind of loaded tap-off
Close the diagnosis and its emulation mode of transition resistance failure, as shown in Fig. 3, load ratio bridging switch transition resistance disclosed by the invention
The diagnosis of failure and its emulation mode include the following steps：
Step 1：Single-phase on-load regulator transformer model is built under Simulink environment in matlab, in case subsequent
The simulation analysis of tap switch handoff procedure；
As shown in Fig. 2, single-phase on-load regulator transformer model includes：AC power source 1, step-up transformer module 2, transformation
Device primary side current acquisition unit 3, single-phase multiwinding transformer module 4, secondary side voltage acquisition unit 5, current oscilloscope S1,
Voltage oscilloscope S2, timing sequencer 6-9, transition resistance R1 and R2 represent the thyristor switch K1 and K2 of main contact, represent auxiliary
Help the thyristor switch M1 and M2 of contact.
Alternating current generator generates sinusoidal ac 1, the input single-phase on-load regulator transformer 4 after step-up transformer 2
Primary side, the movement by simulating load ratio bridging switch carry out pressure regulation.
In embodiments of the present invention, 2 taps are set by multiwinding transformer model 2.
On-load regulator transformer load ratio bridging switch module include timing sequencer unit 6-9, thyristor cell K1-K2 with
And M1-M2, First Transition resistance R1, the second transition resistance R2 composition；2 tap is that the on-load regulator transformer of simulation is adjacent
Tap；Wherein the first tap is connected to the first thyristor K1 by first lead, is connected to second by First Transition resistance R1
Thyristor M1；Second tap passes through the second transition resistance respectively and is connected to third thyristor M2, is connected to by the second lead
Four thyristor K2；First to fourth thyristor controls on-off by timing sequencer 6-9.
Secondary side voltage acquisition module includes the secondary side voltage for acquiring Multiple coil single-phase transformer module secondary side voltage
Acquisition unit 5 and voltage oscilloscope S2.
Primary side current acquisition module includes the current acquisition unit 3 for acquiring Multiple coil single-phase transformer module primary current
With current oscilloscope S1.
Step 2：Parameter setting is carried out to the modules of on-load regulator transformer model；
A kind of diagnosis and its emulation mode of load ratio bridging switch transition resistance failure, it is characterized in that：Emulation setting is single-phase
When on-load regulator transformer parameter, need to be configured after being calculated according to transformer model and corresponding technical parameter.
Wherein the parameter of the single-phase every phase winding in on-load regulator transformer high-pressure side is as follows：
Wherein, UNThe voltage rating (kV) of-transformer；
SNThe rated capacity (kVA) of-transformer；
ΔPk- short circuit loss (kW)；
RT- transformer and UNEvery phase resistance (Ω) of respective side.
Wherein, Uk(%)-short-circuit voltage percentage value；
XT- transformer and UNEvery phase reactance (Ω) of respective side；
In model, for example single-phase on-load regulator transformer parameter setting of the parameter setting of step-up transformer, difference is to boost
The tap number of transformer is 1.
The single-phase on-load regulator transformer model built under the Simulink environment of matlab, as shown in Figure 2.The pressure regulation
The on-load regulator transformer of its model of transformer S11-400/10-0.4 carries out simulation analysis, relevant parameter SN=
400kV, UN=10kV, U2N=0.4kV, Δ P0=4.3063kW, Uk(%)=3.84, I0(%)=0.17 therefore can basis
Formula (1) and (2) calculate relevant parameter.That is RT=2.6914 Ω, XT=9.6 Ω, on-load regulator transformer are carried by software
The multiwinding transformer model that tap can be set is obtained by parameter setting.
In Fig. 2, AC power source 1 generates 220V, the sinusoidal ac of 50Hz, the boosting for being 220/10000V by no-load voltage ratio
The primary side of Multiple coil single-phase transformer 4 is inputted after transformer.Pressure regulation instruction is then controlled by thyristor switch on-off, and thyristor
Switch controlled by timing sequencer.
It is configured timing sequencer according to tap switch transient process, the duration of timing 1 is 0-0.07s, amplitude
It is 1；The duration of timing 2 is 0.065-0.09s, amplitude 1；The duration of timing 3 is 0.085-0.11s, and amplitude is
1；The duration of timing 4 is 0.105-0.16s, amplitude 1.
Setting to load ratio bridging switch module, transition resistance resistance value are 50 Ω.
Step 3：The transition resistance damaged condition of tap switch is simulated respectively；
Two transition resistances of load ratio bridging switch module normal condition simulation, one of transition resistance scaling loss simulation with
And the simulation of two transition resistances while scaling loss.
Wherein transition resistance scaling loss that is to say infinite using open circuit simulation；
In all normal situation of two transition resistances, two transition resistance parallel connections, the resistance value for being connected into circuit is R/2.When
When one of transition resistance scaling loss, then the resistance value for being connected into circuit is R；
When two transition resistances scaling loss simultaneously, then the resistance value of circuit is connected into as infinity；
Wherein R=R1=R2.
Step 4：By the transition waveforms amplitude in transformer primary side current, the variation of time, to tap switch transition
Resistance carries out condition diagnosing.
In step 4, according in transformer primary side current transition waveforms amplitude and the time judge transition resistance therefore
Barrier state, specially：When occurring the case where amplitude is 0 in transition waveform, then failure has occurred in the transition resistance of tap switch,
It is i.e. in damaged condition；On the basis of detecting transition waveform amplitude occur be 0, then observes transition waveforms amplitude and held by 0
The continuous time can determine whether the fault degree of transition resistance, i.e. a transition resistance breaks down or two transition resistances are same
When break down.
When 0<When duration≤T1 that transition waveforms amplitude is 0, then explanation has a transition resistance to break down；Work as T>
The duration that transition waveforms amplitude is 0>T1 then illustrates that failure all has occurred in two transition resistances.
Here T is total switching time, different according to the difference of tap switch model, is generally existed
Between 40ms-60ms, the present invention takes 45ms；T1 be single transition resistance access circuit time, general 10ms≤
T1, the present invention take 15ms.
As shown in figure 4, in all normal situation of two transition resistances, the situation of change of transformer primary side current, by
Fig. 4 is it is found that the amplitude of transition waveform is very big compared with the current amplitude of switching front and back.
As shown in figure 5, in the case where for a transition resistance damage, the situation of change of transformer primary side current, by Fig. 5
It is found that there is the case where amplitude is 0 in the amplitude of transition waveform, as soon as this is because there is a transition resistance damage, also open circuit is drawn
It rises, the duration that amplitude is 0 is 10.840ms.
As shown in fig. 6, in the case where all being damaged for two transition resistances, the situation of change of transformer primary side current, by
Fig. 6 is it is found that the case where amplitude is 0 occurs in the amplitude of transition waveform, and the duration is longer, this is because two transition resistances
Damage, also just caused by open circuit, the duration that amplitude is 0 is 31.484ms.
Thus, it is possible to find out, when tap switch is in different states, the amplitude of transition waveform and time can not yet
It together, therefore, can be using the amplitude of transition waveform and time as the foundation for judging transition resistance state.
Present invention applicant combines Figure of description to be described in detail and describe implementation example of the invention, still
It should be appreciated by those skilled in the art that implementing example above is only the preferred embodiments of the invention, explanation is only in detail
Help reader more fully understands spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any be based on this hair
Any improvement or modification made by bright spirit should all be fallen within the scope and spirit of the invention.
Claims (16)
1. emulation and the diagnostic method of a kind of load ratio bridging switch transition resistance failure, which is characterized in that described includes following step
Suddenly：
Step 1：Build single-phase on-load regulator transformer model；
Step 2：Parameter setting is carried out to the modules for the single-phase on-load regulator transformer model that step 1 is built, wherein institute
Stating modules includes：AC power supply module, step-up transformer module, load ratio bridging switch module, Multiple coil single-phase transformer
Module, secondary side voltage acquisition module, primary side current acquisition module；
Step 3：The load ratio bridging switch transition resistance damaged condition of single-phase on-load regulator transformer is simulated, observation is single-phase to have load to adjust
The situation of change of pressure transformer primary side current；Step 4：By transition waveforms amplitude in transformer primary side current waveform,
The variation of time carries out condition diagnosing to load ratio bridging switch transition resistance.
2. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 1, it is characterized in that：
In step 1, single-phase on-load regulator transformer model is built under Simulink environment in matlab：
Alternating current generator generation sinusoidal ac, the primary side of input single-phase on-load regulator transformer after step-up transformer,
Movement by simulating load ratio bridging switch carries out pressure regulation.
3. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 1 or 2, feature
It is：
In step 1, load ratio bridging switch module is installed in the primary side of single-phase on-load regulator transformer, single-phase on-load voltage regulation
Transformer model is obtained by the multiwinding transformer model for setting tap that matlab software carries by parameter setting.
4. the diagnosis and its emulation mode of load ratio bridging switch transition resistance failure according to claim 3, it is characterized in that：
In matlab, 2 taps are set by multiwinding transformer model.
5. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 4, it is characterized in that：
On-load regulator transformer load ratio bridging switch module includes timing sequencer unit, thyristor cell, First Transition resistance
R1, the second transition resistance R2 composition；2 tap is the on-load regulator transformer adjacent taps of simulation；Wherein the first tap is logical
It crosses first lead and is connected to the first thyristor, the second thyristor is connected to by First Transition resistance R1；Second tap is led to respectively
It crosses the second transition resistance and is connected to third thyristor, the 4th thyristor is connected to by the second lead；Described first to fourth is brilliant
Brake tube controls on-off by timing sequencer.
6. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 3, it is characterized in that：
In step 2, the modules progress parameter setting to single-phase on-load regulator transformer model includes：
Setting to AC power supply module, including voltage value, frequency and phase；
Setting to step-up transformer module, including number of taps, reactance, resistance, voltage and frequency；
Setting to single-phase on-load regulator transformer module, including number of taps, reactance, resistance, voltage and frequency；
Setting to load ratio bridging switch module, including transition resistance resistance value, switching time.
7. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 6, it is characterized in that：
Load ratio bridging switch module includes timing sequencer unit, thyristor cell, First Transition resistance R1, the second transition resistance
R2；
Setting to thyristor switch include to First Transition resistance R1, the second transition resistance R2 and timing sequencer unit when
Sequence setting.
8. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 1, it is characterized in that：
In step 3, the transition resistance damaged condition to tap switch, which carries out simulating respectively, includes：
The normal condition simulation, one of transition resistance scaling loss simulation and two of two transition resistances of load ratio bridging switch module
The simulation of a transition resistance while scaling loss.
9. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 8, it is characterized in that：
Wherein transition resistance scaling loss that is to say infinite using open circuit simulation；
In all normal situation of two transition resistances, two transition resistance parallel connections, the resistance value for being connected into circuit is R/2；
When one of transition resistance scaling loss, then the resistance value for being connected into circuit is R；
When two transition resistances scaling loss simultaneously, then the resistance value of circuit is connected into as infinity；
Wherein R=R1=R2.
10. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 8 or claim 9, feature
It is：
In step 3, first under normal condition according to modeling tap switch transition resistance, before and after transformer is transferred the files, become
The variation of depressor primary side current；
Then it the case where the damage of simulation tap switch one of transition resistance, then observes transformer and transfers the files front and back primary side current
Situation of change；
Finally, simulation two transition resistances of tap switch the case where being in damage simultaneously, observation transformer is transferred the files front and back primary side
The situation of change of electric current.
11. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 1, it is characterized in that：
In step 4, according in transformer primary side current transition waveforms amplitude and the time judge transition resistance failure shape
State, specially：When occurring the case where amplitude is 0 in transition waveform, then failure has occurred in the transition resistance of tap switch, that is, locates
In distress condition；
Detect transition waveform occur amplitude be 0 on the basis of, then observe transition waveforms amplitude be 0 duration, i.e.,
It can determine whether the fault degree of transition resistance, i.e. a transition resistance breaks down or two transition resistances while breaking down：
When transition waveforms amplitude is 0 duration≤T1, then explanation has a transition resistance to break down；Work as T>Little bellow
The duration that shape amplitude is 0>T1 then illustrates that failure all has occurred in two transition resistances.
Wherein, T1 is the access circuit time of single transition resistance, and T is the switching time of tap switch transition resistance.
12. emulation and the diagnostic method of load ratio bridging switch transition resistance failure according to claim 11, it is characterized in that：
The switching time T of tap switch transition resistance is different according to the difference of tap switch model, and the value of T is in 40ms-
Between 60ms；
Individually the value of the time T1 of transition resistance access circuit is：3ms≤T1≤7ms, preferably 15ms.
13. a kind of load ratio bridging switch transition resistance using claim 1-12 the method emulates and fault diagnosis system,
It is characterized in that：
The load ratio bridging switch transition resistance emulation and fault diagnosis system include AC power supply module, step-up transformer mould
Block, load ratio bridging switch module, Multiple coil single-phase transformer module, secondary side voltage acquisition module, primary side current acquire mould
Block；
The AC power supply module uses the form of alternating current generator, generates sinusoidal ac by alternating current generator, is connected to
The primary side of step-up transformer module；
The secondary side of the step-up transformer module is connected to Multiple coil single-phase transformer after passing through primary side current acquisition module
Module primary side, the primary side current acquisition module are used to measure the primary current of Multiple coil single-phase transformer；
The secondary side voltage acquisition module is connected to the secondary side of Multiple coil single-phase transformer module, for acquiring Multiple coil list
The secondary voltage of phase transformer module；
The load ratio bridging switch module is installed in the primary side of Multiple coil single-phase transformer module, by parameter setting will mostly around
Group transformer model is for simulating single-phase on-load regulator transformer.
14. load ratio bridging switch transition resistance emulation according to claim 13 and fault diagnosis system, it is characterised in that：
The on-load regulator transformer load ratio bridging switch module includes timing sequencer unit, thyristor cell, First Transition
Resistance R1, the second transition resistance R2；
2 taps are set by multiwinding transformer model, wherein the first tap is connected to the first thyristor by first lead, are led to
It crosses First Transition resistance R1 and is connected to the second thyristor；Second tap passes through the second transition resistance respectively and is connected to third crystalline substance lock
Pipe, is connected to the 4th thyristor by the second lead；First to fourth thyristor controls on-off by timing sequencer.
15. the emulation of load ratio bridging switch transition resistance described in 3 or 14 and fault diagnosis system according to claim 1, feature
It is：
The emulation and fault diagnosis system further include current oscilloscope, the current oscilloscope and primary side current acquisition module
Output end be connected, for showing the single-phase on-load regulator transformer primary current waveform simulated.
16. load ratio bridging switch transition resistance emulation according to claim 15 and fault diagnosis system, it is characterised in that：
The emulation and fault diagnosis system further include voltage oscilloscope, the voltage oscilloscope and secondary side voltage acquisition module
Output end be connected, for showing the secondary voltage waveform for the single-phase on-load regulator transformer simulated.
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| WO2023070781A1 (en) * | 2021-10-27 | 2023-05-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer on-load tap-changer switching topological structure design method |
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