CN104037731B - Large-power rectification transformer set differential protection method - Google Patents
Large-power rectification transformer set differential protection method Download PDFInfo
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Abstract
The invention relates to rectification transformer set differential protection and relay protection configuration, and especially relates to a large-power rectification transformer set differential protection method. The method is characterized by comprising the following steps: step one, accessing primary side voltage currents, tertiary side voltage currents and secondary side voltage currents, i.e., rectification transformation side current signals into a collector for converting into current voltage signals in an FT3 form, and accessing a digitalization merger; step two, performing multipath merging on the voltage current signals in the FT3 form at each side, and converting into 9-2 messages, and simultaneously sending current and voltage information input by the collector through fibers after synchronization processing to a voltage regulating transformer protective device; and step three, the voltage regulating transformer protective device receiving the current signals at each side from the digitalization merger, calculating differential currents and realizing correlation calculation and determination. According to the invention, rectification transformer set relay protection configuration is improved, and the capability of a protection apparatus in identifying internal and external faults of a rectification transformer area and rectifier set faults is further improved.
Description
Technical field
The present invention relates to rectifier transformer group differential protection and relay protection scheme, especially a kind of power rectifier transformation
Device group differential protecting method.
Background technology
In metallurgical, electrochemistry enterprise, typically powered using high-power rectifying device in production.Will 35-500kV voltage etc.
The high-voltage alternating inlet wire of level, through adjustable transformer-rectifier transformer group blood pressure lowering pressure regulation, produces system by silicon rectifier device supply
The direct current that system voltage is adjustable, electric current reaches hundreds of kilo-amperes.Often set Rectification Power Factor is by 1 set of adjustable transformer, 2 sets of rectifier transformers, whole
Flow device and corresponding auxiliary equipment are constituted.
The nucleus equipment that rectifier transformer is powered as Electrolytic Aluminum Series, effect aborning is self-evident, once sending out
Raw catastrophe failure, not only directly affects the normal production of electrolytic series, and the direct and consequential damage producing even more cannot be estimated
Meter.Protection device accordingly, as transformator is particularly important, and the imperfection of the configuration of the relay protection of commutation system is straight
Connect the stable operation of impact network system.
Large Copacity rectifier power source, in metallurgy industry, especially has very important status in aluminium electroloysis industry, and it is normally transported
Row is directly connected to the whole safety and stability producing series, the electrolytic series producing 150000 tons per year, its loss of 5 hours that have a power failure
Up to several ten million yuan, therefore, every measure to be taken to ensure the normal operation of rectifier power source, perfect, reliable protection
Setting can find unit abnormal conditions early, excises fault in time, and Accident prevention expands, to ensureing that system safety operation has
Significance.
Because rectifier transformer is different from general power transformer, the configuration of its relay protection will meet Rectification Power Factor to continuing
The particular/special requirement of electric protection, and due to rectifier transformer valve side be Multiple coil, high current it is impossible to install conventional current transformer,
Measurement is extremely difficult, and the configuration to rectifier transformer differential protection causes difficulty, and it is poor that therefore current rectifier transformer is not provided with
Dynamic protection, only by protection as the main protection of power transformer interior fault, arranges two sets of overcurrent protections, first set electricity simultaneously
The current transformer of stream protection is installed in adjustable transformer mains side, and protection snap action is in unit circuit breaker trip.Second set
It is rectifier transformer primary side that the current transformer of current protection is installed in adjustable transformer secondary side, and is arranged on transformer oil
In case, protection time delay or snap action are in unit circuit breaker trip.For carrying out reactive-load compensation in the tertiary winding and filtering is joined
Put form, also need to arrange reactive-load compensation and filter（Hereinafter referred to as filter）Relay protection, current transformer is loaded on
Tertiary winding outgoing line side, and be installed in oil tank of transformer.And, the definite value of above overcurrent protection is difficult to adjust, occurred more
The situation of level tripping operation, the stable operation of impact network system.
Content of the invention
It is an object of the invention to provide a kind of high-power rectifier transformer group differential protecting method, rectifier transformer can be improved
The relay protection scheme of device group, and improve the rapidity of rectifier transformer protection.
A kind of high-power rectifier transformer group differential protecting method, it is particular in that, comprises the steps：
First rectifier transformer group is divided into a pressure regulation changing distance, two rectifier transformer intervals to carry out configuration protection dress
Put, wherein pressure regulation changing distance protection device accesses the pressure regulation signal of adjustable transformer pressure regulation gear controller, primary side voltage electricity
Stream signal, three side voltage and current signals, pressure regulation become secondary side current signal, and rectification changing distance protection device accesses rectification and becomes
Depressor current on line side, current on valve side；
The first step：Primary side, three side voltage x current, secondary sides are that rectification becomes in current on line side signal access harvester
It is converted into FT3 form current and voltage signals, then through intelligent acess digitized combiner；
Second step：Each side FT3 form voltage and current signal is carried out multichannel merging by digitized combiner, and is converted to 9-
2 messages, the electric current simultaneously inputting harvester, information of voltage are synchronized process after be sent to adjustable transformer protection dress through optical fiber
Put；Current adjustable transformer operational tapses information accesses adjustable transformer protection device by gear controller after code value conversion；
3rd step：Adjustable transformer protection device receives each side current signal from digitized combiner, calculates differential
Electric current, realizes adjustable transformer differential protection and back-up protection correlation computations and judgement.
Specifically include following steps：
The first step：In rectifier transformer valve side outlet copper bar, electronic current mutual inductor collection rectifier transformer valve side is installed
Electric current；
Second step：The current on valve side collecting and rectifier transformer current on line side are accessed harvester through shielded cable, will
The signal of telecommunication is converted into FT3 form current and voltage signals, then through intelligent acess digitized combiner；
3rd step：Each side FT3 form voltage and current signal is carried out multichannel merging by digitized combiner, and is converted to 9-
2 messages, the electric current simultaneously inputting harvester, information of voltage are synchronized process after be sent to rectifier transformer protection dress through optical fiber
Put；
4th step：Each for rectifier transformer side current signal is accessed rectifier transformer protection device, calculates difference current, real
Existing rectifier transformer differential protection and back-up protection correlation computations and judgement.
Wherein adjustable transformer protection device accesses primary side, net side, three side voltage and current signals, thus realizing pressure regulation
Transformator three side is differential and primary side, three side back-up protections, and rectifier transformer protection device to access net side be that pressure regulation becomes two
Secondary side, rectifier transformer current on valve side signal, realize rectifier transformer both sides differential protection.
Wherein pressure regulation becomes protection device access pressure regulation and becomes gear information, calculates voltage and adjusts with gear in real time and change
Differential protection coefficient of balance, thus ensure the correctness of pressure regulation transformer differential Current calculation, specifically：
The first step：Calculate each phase winding voltage of net side and B, C phase relative to A phase equilibrium coefficient：
Rectifier transformer net side current A phase voltage is：Ua=（Umax-Umin）*(N-Xa)/（N-1）+ Umin, rectifier transformer
Device net side current B phase voltage is：Ub=（Umax-Umin）*(N-Xb)/（N-1）+ Umin, rectifier transformer net side current C phase is electric
Press and be：Uc=（Umax-Umin）*(N-Xc)/（N-1）+Umin；Rectifier transformer net side B, C phase is relative to A phase equilibrium coefficient respectively
For：Ub/Ua、Uc/Ua；Rectifier transformer net side minimum voltage is Umin, and ceiling voltage is Umax；The total gear of pressure regulation is N；Xa is
A phase gear, Xb is B phase gear, and Xc is C phase gear, and Ua is rectifier transformer net side A phase winding present operating voltage, and Ub is whole
Convertor transformer net side A phase winding present operating voltage, Uc is rectifier transformer net side A phase winding present operating voltage；
Second step：Calculate each side rated current and net side A phase equilibrium coefficient：
By formulaSecondary rated current I of primary side calculatinge, wherein Sn、Un、nTAIt is to be
" transformator nameplate rated capacity " and " rated line voltage of primary side " and " primary side TA no-load voltage ratio " in system parameter；
By formula IA=Sn/(3*Ux*nTA) calculate the rectification change secondary specified phase current I of net side A phaseA, wherein, Sn、nTA、Ux
It is " the rectifier transformer nameplate rated capacity " and " net side TA no-load voltage ratio " in systematic parameter and calculating gained net side A phase winding electricity
Pressure；
Net side A phase differential protection coefficient of balance can be obtained is：kphA=Ie/IA；
3rd step calculates each phase equilibrium coefficient of net side：
Net side A phase differential protection coefficient of balance is：kphA=Ie/IA；
Net side B phase differential protection coefficient of balance is：kphB=kphA*(Ub/Ua)；
Net side C phase differential protection coefficient of balance is：kphC=kphA*(Uc/Ua).
Wherein rectifier transformer carries out phase compensation using Phase-shifting algorithm to electric current, thus adapting to the rectification of different phase shifting angles
Transformator：
The mode of connection of rectifier transformer is divided into three kinds, Y (shifting)/Δ -11, Δ (shifting)/Δ -10, Y (shifting)/Y-12；
Wherein " Y (shifting)/Δ -11 rectifier transformer longitudinal difference protection TA secondary current corner scheme：Net side TA not corner, valve
Side TA corner；
Leading is in same famous prime ministerPhase angle be 30 ° of-α=22.5 °, α=+ 7.5 °；Not corner, will
Turn round 30 ° of-α=22.5 °, obtains formula
" Y (shifting)/Δ " rectifier transformer valve side TA secondary side three-phase current is electric current before corner；
The three-phase current participating in differential current computing is electric current after corner；
Wherein " Δ (shifting)/Δ -10 " rectifier transformer longitudinal difference protection, TA secondary current corner scheme, net side TA not corner,
Valve side TA corner；
Leading inPhase angle difference be 60 ° of-α, obtain：
It is electric current before corner that Δ (shifting)/Δ rectification becomes valve side TA secondary side three-phase current；
The three-phase current participating in differential current computing is electric current after corner；
α Shifting Phase of Rectifier Transformer angle；
Wherein " Y (shifting)/Y-12 rectifier transformer longitudinal difference protection TA secondary current corner scheme：Net side TA not corner, valve side
TA corner；
Moving α after in formula is just, reach α is negative.
The beneficial effect of guard method of the present invention is：Perfect rectifier transformer group relay protection scheme, thus further
Improve protection device to the identification ability of rectifier transformer internal fault external fault and Rectification Power Factor fault it is ensured that rectifier transformer safety
Stable operation, reduces the loss of electrical equipment of aluminium electrolysis enterprise, brings direct economic benefit, and improves safety in production and carry
The stable operation of high electrical network.The invention discloses high-power rectifier transformer group differential protecting method, including rectifier transformer valve
Side current acquisition electronic current sensing head and digital collection equipment, current on line side digital collection equipment, combiner, number
Word pressure regulation transformer differential protection device and digitized rectifier transformer differential protection.Solve the big electricity in rectifier transformer valve side
Flow measurement and the difficult problem not enabling rectifier transformer differential protection, improve rectifier transformer relay protection scheme, improve rectification
The level of protection of transformer equipment, terminates rectification change and is configured without differential protection, continue to use conventional power transformer relay protecting
Epoch.
Brief description
Fig. 1 is rectifier transformer valve side lead copper bar arrangement mode and special-shaped electronic current mutual inductor sensing head is installed and shown
It is intended to；
Fig. 2 is that Rectification Power Factor interval of the present invention divides schematic diagram；
Fig. 3 is adjustable transformer of the present invention, rectifier transformer protection device access schematic diagram；
Fig. 4 is " Y (shifting)/Δ " Shifting Phase of Rectifier Transformer schematic diagram；
Fig. 5 is " Δ (shifting)/Δ " Shifting Phase of Rectifier Transformer schematic diagram.
Specific embodiment
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that enforcement：
As shown in Figure 1, 2, 3, a kind of high-power rectifier transformer group differential protective system and its guard method, including rectification
The collection of transformator valve side the high current electronic current mutual inductor based on Luo-coil principle and digital galvanic current collecting device,
Primary side current and current on line side digitized current acquisition equipment, combiner, the pressure regulation transformation of real-time adjustment each lateral balance coefficient
Device differential protection and the digitized rectifier transformer differential protection and the software system that adapt to different phase shift angles.
1st, described rectifier transformer current on valve side collection adopts punching, the biography based on Luo-coil principle for the rectangular configuration
Sense head is arranged on the lead copper bar of transformator valve side.According to rectifier transformer every phase terminal copper bar number, determine and use sensing head
Quantity.The sensing head based on Luo-coil measuring principle of rectangular configuration is installed in the Same Name of Ends of every phase valve side lead copper bar.As
Shown in Fig. 2.
2nd, described primary side, the local mounted harvester of net side are primary side and net side conventional voltage, current transformer
Collection voltages, electric current access through shielded cable, are converted into FT3 form electric current, voltage signal through intelligent acess combiner.Rectification becomes
Depressor current on valve side gathers through electronic current mutual inductor and is linked into local mounted signal condition and harvester through shielding, turns
Change into after FT3 form through intelligent acess combiner.
3rd, described high-power rectifier transformer differential protective system adopt digitized combiner receive primary side, net side,
Valve side digital collection device transmits FT3 form electric current, voltage signal, synchronized process, and multiple signals are converted to 9-2 report after merging
Literary composition, is sent to pressure regulation change, rectifier transformer protection device finally by optical fiber；
4th, described adjustable transformer protection device accesses primary side, net side, three side voltages, current signals, realizes adjusting
Pressure transformer three side is differential and primary side, three side back-up protections configure.Rectifier transformer device accesses net side, current on valve side letter
Number, realize rectifier transformer both sides differential protection.As shown in Figure 3.
The adjustable transformer protection device biased differential protection based on virtual braking principle for the configuration, difference stream fast tripping protection, increasing
Amount is differential to wait main protection, the back-up protection such as primary side overcurrent protection, gap protection, overload, three side configuration overcurrent protections, limits
When the back-up protection such as fast tripping protection, zero sequence overvoltage.
The rectifier transformer protection device biased differential protection based on virtual braking principle for the configuration, difference stream fast tripping protection, increasing
Amount is differential to wait main protection, and rectification becomes the back-up protections such as net side configuration time-limit quick break protection, overload protection.
5th, described adjustable transformer protection device accesses pressure regulation and becomes gear information, is calculated in real time according to current operational tapses
Go out rectifier transformer net side (pressure regulation change secondary side) voltage and corresponding each lateral balance coefficient it is ensured that adjustable transformer comparative indicator
The correctness calculated.
The first step calculates each phase winding voltage of net side and B, C phase relative to A phase equilibrium coefficient：
Rectifier transformer net side current A phase voltage is：Ua=（Umax-Umin）*(N-Xa)/（N-1）+Umin,
Rectifier transformer net side current B phase voltage is：Ub=（Umax-Umin）*(N-Xb)/（N-1）+Umin,
Rectifier transformer net side current C phase voltage is：Uc=（Umax-Umin）*(N-Xc)/（N-1）+Umin；
Rectifier transformer net side B, C phase is respectively relative to A phase equilibrium coefficient：Ub/Ua、Uc/Ua；Rectifier transformer net side is
Low-voltage is Umin, and ceiling voltage is Umax；The total gear of pressure regulation is N；Xa is A phase gear, and Xb is B phase gear, and Xc is C phase shelves
Position, Ua is rectifier transformer net side A phase winding present operating voltage, and Ub is rectifier transformer net side A phase winding work at present electricity
Pressure, Uc is rectifier transformer net side A phase winding present operating voltage；
Second step calculates each side rated current and net side A phase equilibrium coefficient：
By formulaThe secondary rated current of primary side calculating.
Wherein Sn、Un、nTAIt is " transformator nameplate rated capacity " in adjustable transformer device parameter and " primary side is once
Rated line voltage " and " primary side TA no-load voltage ratio "
By formula IA=Sn/(3*Ux*nTA) calculate the rectification change secondary specified phase current of net side A phase.
Wherein, Sn、nTA、UxIt is " the rectifier transformer nameplate rated capacity " and " net side TA no-load voltage ratio " in systematic parameter and meter
Calculate gained net side A phase winding voltage.
Net side A phase differential protection coefficient of balance can be obtained is：kphA=Ie/IA.
3rd step calculates each phase equilibrium coefficient of net side：
Net side A phase differential protection coefficient of balance is：kphA=Ie/IA
Net side B phase differential protection coefficient of balance is：kphB=kphA*(Ub/Ua)
Net side C phase differential protection coefficient of balance is：kphC=kphA*(Uc/Ua)
6th, described rectifier transformer differential protection carries out phase compensation using distinctive Phase-shifting algorithm to electric current, fits
Answer the rectifier transformer of different phase shifting angles.
As shown in Figure 4,5, the mode of connection of the rectifier transformer that large-scale smelting enterprise commonly uses has three kinds：Y (shifting)/Δ -11,
Δ (shifting)/Δ -10, Y (shifting)/Y-12.
" Y (shifting)/Δ -11 rectifier transformer longitudinal difference protection TA secondary current corner scheme：Net side TA not corner, valve side TA
Corner.
See Fig. 4,Leading is in same famous prime ministerPhase angle be 30 ° of-α=22.5 °, α=+ 7.5 °；Not corner,
WillTurn round 30 ° of-α=22.5 °, obtains formula（3）.
" Y (shifting)/Δ " rectifier transformer valve side TA secondary side three-phase current（Electric current before corner）；
Participate in the three-phase current of differential current computing（Electric current after corner）；
" Δ (shifting)/Δ -10 " rectifier transformer longitudinal difference protection, TA secondary current corner scheme, net side TA not corner, valve side
TA corner.
See Fig. 5,Leading inPhase angle difference be 60 ° of-α, obtain：
Δ (shifting)/Δ rectification becomes valve side TA secondary side three-phase current（Electric current before corner）；
Participate in the three-phase current of differential current computing（Electric current after corner）；
" Y (shifting)/Y-12 rectifier transformer longitudinal difference protection TA secondary current corner scheme：Net side TA not corner, valve side TA turns
Angle.
Moving α after in formula is just, reach α is negative.
Claims (4)
1. a kind of high-power rectifier transformer group differential protecting method is it is characterised in that comprise the steps：
First rectifier transformer group is divided into a pressure regulation changing distance, two rectifier transformer intervals to carry out configuration protection device, its
Middle adjustable transformer protection device accesses the pressure regulation signal of adjustable transformer pressure regulation gear controller, primary side voltage x current letter
Number, three side voltage and current signals, pressure regulation become secondary side current signals, and rectifier transformer protection device accesses rectifier transformer
Current on line side, current on valve side；
The first step：Primary side, three side voltage x current, secondary sides are that rectification becomes conversion in current on line side signal access harvester
Become FT3 form current and voltage signals, then through intelligent acess digitized combiner；
Second step：Each side FT3 form current and voltage signals are carried out multichannel merging by digitized combiner, and are converted to 9-2 report
Literary composition, the electric current simultaneously inputting harvester, information of voltage are synchronized process after be sent to adjustable transformer protection device through optical fiber；
Current adjustable transformer operational tapses information accesses adjustable transformer protection device by gear controller after code value conversion；
3rd step：Adjustable transformer protection device receives each side current signal from digitized combiner, calculates difference current,
Realize adjustable transformer differential protection and back-up protection correlation computations and judgement；
Further, following steps are specifically included：
1st step：In rectifier transformer valve side outlet copper bar, electronic current mutual inductor collection rectifier transformer current on valve side is installed；
2nd step：The current on valve side collecting and rectifier transformer current on line side are accessed harvester through shielded cable, by the signal of telecommunication
It is converted into FT3 form current and voltage signals, then through intelligent acess digitized combiner；
3rd step：Each side FT3 form current and voltage signals are carried out multichannel merging by digitized combiner, and are converted to 9-2 report
Literary composition, the electric current simultaneously inputting harvester, information of voltage are synchronized process after be sent to rectifier transformer protection device through optical fiber；
4th step：Each for rectifier transformer side current signal is accessed rectifier transformer protection device, calculates difference current, realize whole
Convertor transformer differential protection and back-up protection correlation computations and judgement.
2. high-power rectifier transformer group differential protecting method as claimed in claim 1 it is characterised in that：Wherein pressure regulation transformation
Device protection device accesses primary side, net side, three side voltage and current signals, thus it is differential and once to realize adjustable transformer three side
Side, three side back-up protections, and rectifier transformer protection device access net side is pressure regulation change secondary side, rectifier transformer valve side electricity
Stream signal, realizes rectifier transformer both sides differential protection.
3. high-power rectifier transformer group differential protecting method as claimed in claim 1 it is characterised in that：Wherein pressure regulation transformation
Device protection device accesses pressure regulation and becomes gear information, calculates voltage and adjusts with gear in real time and change differential protection balance system
Number, thus ensure the correctness of pressure regulation transformer differential Current calculation, specifically：
The first step：Calculate each phase winding voltage of net side and B, C phase relative to A phase equilibrium coefficient：
Rectifier transformer net side current A phase voltage is：Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin, rectifier transformer
Net side current B phase voltage is：Ub=(Umax-Umin) * (N-Xb)/(N-1)+Umin, rectifier transformer net side current C phase voltage
For：Uc=(Umax-Umin) * (N-Xc)/(N-1)+Umin；Rectifier transformer net side B, C phase is relative to A phase equilibrium coefficient respectively
For：Ub/Ua、Uc/Ua；Rectifier transformer net side minimum voltage is Umin, and ceiling voltage is Umax；The total gear of pressure regulation is N；Xa is
A phase gear, Xb is B phase gear, and Xc is C phase gear, and Ua is rectifier transformer net side A phase winding present operating voltage, and Ub is whole
Convertor transformer net side B phase winding present operating voltage, Uc is rectifier transformer net side C phase winding present operating voltage；
Second step：Calculate each side rated current and net side A phase equilibrium coefficient：
By formulaSecondary rated current I of primary side calculatinge, wherein Sn、Un、nTAIt is system ginseng
" transformator nameplate rated capacity " in number and " rated line voltage of primary side " and " primary side TA no-load voltage ratio "；
By formula IA=Sn/(3*Ux*nTA) calculate the rectification change secondary specified phase current I of net side A phaseA, wherein, Sn、nTA、UxIt is to be
" rectifier transformer nameplate rated capacity " and " net side TA no-load voltage ratio " in system parameter and calculating gained net side A phase winding voltage；
Net side A phase differential protection coefficient of balance can be obtained is：kphA=Ie/IA；
3rd step calculates each phase equilibrium coefficient of net side：
Net side A phase differential protection coefficient of balance is：kphA=Ie/IA；
Net side B phase differential protection coefficient of balance is：kphB=kphA*(Ub/Ua)；
Net side C phase differential protection coefficient of balance is：kphC=kphA*(Uc/Ua).
4. high-power rectifier transformer group differential protecting method as claimed in claim 1 it is characterised in that：Wherein rectifier transformer
Device carries out phase compensation using Phase-shifting algorithm to electric current, thus adapting to the rectifier transformer of different phase shifting angles：
The mode of connection of rectifier transformer is divided into three kinds, Y (shifting)/Δ -11, Δ (shifting)/Δ -10, Y (shifting)/Y-12；
Wherein " Y (shifting)/Δ -11 rectifier transformer longitudinal difference protection TA secondary current corner scheme：Net side TA not corner, valve side TA
Corner；
Leading is in same famous prime ministerPhase angle be 30 ° of-α=22.5 °, α=+ 7.5 °；Not corner, willTo
After turn 30 ° of-α=22.5 °, obtain formula
" Y (shifting)/Δ " rectifier transformer valve side TA secondary side three-phase current is electric current before corner；
The three-phase current participating in differential current computing is electric current after corner；
Wherein " Δ (shifting)/Δ -10 " rectifier transformer longitudinal difference protection, TA secondary current corner scheme, net side TA not corner, valve side
TA corner；
Leading inPhase angle difference be 60 ° of-α, obtain：
It is electric current before corner that Δ (shifting)/Δ rectification becomes valve side TA secondary side three-phase current；The three-phase current participating in differential current computing is electric current after corner；
α Shifting Phase of Rectifier Transformer angle；
Wherein " Y (shifting)/Y-12 rectifier transformer longitudinal difference protection TA secondary current corner scheme：Net side TA not corner, valve side TA turns
Angle；
Moving α after in formula is just, reach α is negative.
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| CN201310581645.4A CN104037731B (en) | 2013-11-19 | 2013-11-19 | Large-power rectification transformer set differential protection method |
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| CN104065038A (en) * | 2013-12-06 | 2014-09-24 | 国家电网公司 | Differential protection method of large-power rectifier transformer set |
| CN104215875B (en) * | 2014-09-25 | 2017-09-01 | 国家电网公司 | The monitoring method of high-power rectifier transformer unit rectification valve breakdown |
| CN105406738B (en) * | 2015-12-23 | 2017-11-14 | 无锡江南计算技术研究所 | High-voltage rectifying system for computer room power supply |
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| CN109149519A (en) * | 2018-09-11 | 2019-01-04 | 国网江苏省电力有限公司泰州供电分公司 | A kind of distribution transforming differential protecting method based on petal type power grid |
| CN112086935B (en) * | 2020-08-20 | 2022-09-20 | 许继电气股份有限公司 | Converter transformer differential protection control method and device capable of achieving adaptive voltage reduction operation |
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