CN104037731A - Large-power rectification transformer set differential protection method - Google Patents
Large-power rectification transformer set differential protection method Download PDFInfo
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- CN104037731A CN104037731A CN201310581645.4A CN201310581645A CN104037731A CN 104037731 A CN104037731 A CN 104037731A CN 201310581645 A CN201310581645 A CN 201310581645A CN 104037731 A CN104037731 A CN 104037731A
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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 relaying protection configuration, especially a kind of high-power rectifier transformer group differential protecting method.
Background technology
In metallurgical, electrochemistry enterprise, in production, the general high-power rectifying device that adopts is powered.By the high-voltage alternating inlet wire of 35-500kV electric pressure, through voltage regulating transformer-rectifier transformer group step-down pressure regulation, supply with by silicon rectifier device the direct current that production system voltage is adjustable, electric current reaches hundreds of kilo-amperes.Every cover Rectification Power Factor is made up of 1 cover voltage regulating transformer, 2 cover rectifier transformers, rectifying installation and corresponding auxiliary equipment.
Rectifier transformer is as the nucleus equipment of Electrolytic Aluminum Series power supply, and effect is aborning self-evident, once there is catastrophe failure, not only directly affects the normal production of electrolytic series, and the direct and consequential damage producing is inestimable especially.Therefore, seem particularly important as the protective device of transformer, the imperfection of the configuration of the relaying protection of commutation system directly affects the stable operation of network system.
Large capacity rectifier power source is at metallurgy industry; there is very important status in aluminium electroloysis industry especially; its normal operation is directly connected to the serial safety and stability of whole production; produce the electrolytic series of 150,000 tons per year for one; its loss in 5 hours that has a power failure can reach several ten million yuan; therefore; take every measure to ensure the normal operation of rectifier power source; perfect, reliable protection setting can be found unit abnormal conditions early; excision fault in time; Accident prevention expands, significant to ensureing system safety operation.
Because rectifier transformer is different from general power transformer, the configuration of its relaying protection will meet the particular/special requirement of Rectification Power Factor to relaying protection, and because rectifier transformer valve side is many windings, large electric current, conventional current instrument transformer cannot be installed, measure very difficult, configuration to rectifier transformer differential protection has caused difficulty, therefore rectifier transformer does not arrange differential protection at present, the only main protection as power transformer interior fault by protection, two cover overcurrent protections are set simultaneously, the current transformer of first set current protection is installed in voltage regulating transformer mains side, protection instantaneous operation is in unit circuit breaker trip.It is rectifier transformer primary side that the current transformer of the second cover current protection is installed in voltage regulating transformer secondary side, and is arranged in oil tank of transformer, and protection time delay or instantaneous operation are in unit circuit breaker trip.For the collocation form that carries out reactive power compensation and filtering at the tertiary winding, also need to arrange the relaying protection of reactive power compensation and filter (hereinafter to be referred as filter), current transformer is loaded on tertiary winding outgoing line side, and is installed in oil tank of transformer.And the definite value of above overcurrent protection is difficult to adjust, there is the situation of overstep tripping, affect the stable operation of network system.
Summary of the invention
The object of this invention is to provide a kind of high-power rectifier transformer group differential protecting method, can improve the relaying protection configuration of rectifier transformer group, and improve the rapidity of rectifier transformer protection.
A kind of high-power rectifier transformer group differential protecting method, its special feature is, comprises the steps:
First be that configuration protection device is carried out at a pressure regulation changing distance, two rectifier transformer intervals by rectifier transformer component, wherein the pressure regulation signal of pressure regulation changing distance protective device access voltage regulating transformer pressure regulation gear controller, primary side voltage and current signal, three side voltage and current signals, pressure regulation become secondary side current signal, and rectification changing distance protective device accesses rectifier transformer current on line side, current on valve side;
The first step: be to convert FT3 form current and voltage signals in rectification change current on line side signal access collector by primary side, three side electric current and voltages, secondary sides, then through optical fiber access digitlization combiner;
Second step: each side FT3 form voltage and current signal is carried out multichannel merging by digitlization combiner, and be converted to 9-2 message sends to voltage regulating transformer protective device through optical fiber by the electric current of collector input, information of voltage simultaneously after synchronous processing; Current voltage regulating transformer operational taps information accesses voltage regulating transformer protective device by gear controller after code value conversion;
The 3rd step: voltage regulating transformer protective device receives the each side current signal from digitlization combiner, calculates differential current, realizes voltage regulating transformer differential protection and backup protection correlation computations and judgement.
Specifically comprise the steps:
The first step: at rectifier transformer valve side outlet copper bar, electronic current mutual inductor is installed and is gathered rectifier transformer current on valve side;
Second step: the current on valve side collecting and rectifier transformer current on line side are accessed to collector through shielded type cable, convert the electrical signal to FT3 form current and voltage signals, then through optical fiber access digitlization combiner;
The 3rd step: each side FT3 form voltage and current signal is carried out multichannel merging by digitlization combiner, and be converted to 9-2 message sends to rectifier transformer protective device through optical fiber by the electric current of collector input, information of voltage simultaneously after synchronous processing;
The 4th step: by each rectifier transformer side current signal access rectifier transformer protective device, calculate differential current, realize rectifier transformer differential protection and backup protection correlation computations and judgement.
Wherein voltage regulating transformer protective device access primary side, net side, three side voltage and current signals; thereby realize the differential and primary side of voltage regulating transformer three sides, three side backup protections; and rectifier transformer protective device Access Network side is pressure regulation change secondary side, rectifier transformer current on valve side signal, realize rectifier transformer both sides differential protection.
Wherein pressure regulation becomes protective device access pressure regulation and becomes gear information, and calculate voltage in real time along with gear regulates and change differential protection coefficient of balance, thereby ensure the correctness of pressure regulation transformer differential Current calculation, specifically:
The first step: calculate the each phase winding voltage of net side and B, C A phase equilibrium coefficient relatively:
The current A phase voltage of rectifier transformer net side is: Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin, the current B phase voltage of rectifier transformer net side is: Ub=(Umax-Umin) * (N-Xb)/(N-1)+Umin, and rectifier transformer net side current C phase voltage is: Uc=(Umax-Umin) * (N-Xc)/(N-1)+Umin; Rectifier transformer net side B, C relatively A phase equilibrium coefficient are respectively: 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, and Xb is B phase gear, and Xc is C phase gear, and Ua is rectifier transformer net side A phase winding work at present voltage, and Ub is rectifier transformer net side A phase winding work at present voltage, and Uc is rectifier transformer net side A phase winding work at present voltage;
Second step: calculate each side rated current and net side A phase equilibrium coefficient:
Press formula
the primary side secondary rated current I calculating
e, wherein S
n, U
n, n
tA" transformer nameplate rated capacity " and " rated line voltage of primary side " and " the primary side TA no-load voltage ratio " in system parameters;
Press formula I
a=S
n/ (3*U
x* n
tA) calculate rectification and become net side A phase secondary specified phase current I
a, wherein, S
n, n
tA, U
x" rectifier transformer nameplate rated capacity " and " net side TA no-load voltage ratio " and the calculating gained net side A phase winding voltage in system parameters;
Can net side A phase differential protection coefficient of balance be: k
phA=I
e/ I
a;
The 3rd step is calculated the each phase equilibrium coefficient of net side:
Net side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a;
Net side B phase differential protection coefficient of balance is: k
phB=k
phA* (U
b/ U
a);
Net side C phase differential protection coefficient of balance is: k
phC=k
phA* (U
c/ U
a).
Wherein rectifier transformer adopts phase shift algorithm to carry out phase compensation to electric current, thereby adapts to the rectifier transformer of different phase shifting angles:
The mode of connection of rectifier transformer is divided into three kinds, Y (moving)/Δ-11, Δ (moving)/Δ-10, Y (moving)/Y-12;
Wherein " Y (moving)/Δ-11 rectifier transformer longitudinal difference protection TA secondary current corner scheme: not corner of net side TA, valve side TA corner;
leading is in same famous prime minister
phase angle be 30 °-α=22.5 °, α=+ 7.5 °;
not corner, will
30 °-α=22.5 ° that turn round, obtain formula
---" Y (moving)/Δ " rectifier transformer valve side TA secondary side three-phase current is electric current before corner;
---the three-phase current that participates in differential current computing is corner after-current;
Wherein " Δ (moving)/Δ-10 " rectifier transformer longitudinal difference protection, TA secondary current corner scheme, not corner of net side TA, valve side TA corner;
leading in
phase angle difference be 60 °-α:
---it is electric current before corner that Δ (moving)/Δ rectification becomes valve side TA secondary side three-phase current;
---the three-phase current that participates in differential current computing is corner after-current;
α---Shifting Phase of Rectifier Transformer angle;
Wherein " Y (moving)/Y-12 rectifier transformer longitudinal difference protection TA secondary current corner scheme: not corner of net side TA, valve side TA corner;
After in formula, move α for just, reach α is for negative.
The beneficial effect of guard method of the present invention is: perfect rectifier transformer group relaying protection configuration; thereby further improve the recognition capability of protective device to rectifier transformer internal fault external fault and Rectification Power Factor fault; ensure rectifier transformer safe and stable operation; reduce the loss of an electric equipment of aluminium electrolysis enterprise; bring direct economic benefit, and the stable operation that improves safety in production and improve electrical network.The invention discloses high-power rectifier transformer group differential protecting method, comprise rectifier transformer current on valve side collection electronic type current sensing head and digital collection equipment, current on line side digital collection equipment, combiner, Digitalized pressure-regulating transformer differential protective device and digitlization rectifier transformer differential protection.Solve the side Super-Current Measurement of rectifier transformer valve and can not realize the difficult problem of rectifier transformer differential protection; improve rectifier transformer relaying protection configuration; improve the level of protection of rectifier transformer equipment; finish the rectification configuration differential protection that disappeared, continue to use the epoch of common power transformer relaying protection.
Brief description of the drawings
Fig. 1 is rectifier transformer valve side lead-in wire copper bar arrangement mode and special-shaped electronic current mutual inductor sensing head scheme of installation;
Fig. 2 is that schematic diagram is divided at Rectification Power Factor of the present invention interval;
Fig. 3 is voltage regulating transformer of the present invention, rectifier transformer protective device access schematic diagram;
Fig. 4 is " Y (moving)/Δ " Shifting Phase of Rectifier Transformer schematic diagram;
Fig. 5 is " Δ (moving)/Δ " Shifting Phase of Rectifier Transformer schematic diagram.
Embodiment
For achieving the above object, the present invention adopts following technical scheme to implement:
As shown in Figure 1, 2, 3; a kind of high-power rectifier transformer group differential protective system and guard method thereof, comprise that the large current acquisition of rectifier transformer valve side uses electronic current mutual inductor based on Luo-coil principle and digitlization current acquisition equipment, primary side current and current on line side digitlization current acquisition equipment, combiner, adjusts in real time the voltage regulating transformer differential protection of each lateral balance coefficient and can adapt to digitlization rectifier transformer differential protection and the software systems of different phase shift angles.
1, described rectifier transformer current on valve side collection adopts punching, the sensing head of rectangular configuration based on Luo-coil principle to be arranged on transformer valve side lead-in wire copper bar.According to the every phase terminal copper bar of rectifier transformer number, determine and use sensing head quantity.Same Name of Ends at every phase valve side lead-in wire copper bar is installed the sensing head based on Luo-coil measuring principle of rectangular configuration.As shown in Figure 2.
2, described primary side, the local mounted collector of net side primary side and the conventional voltage of net side, current transformer gather voltage, electric current accesses through shielded type cable, converts FT3 form electric current to, voltage signal accesses combiner through optical fiber.Rectifier transformer current on valve side is linked into local mounted signal condition and harvester through electronic current mutual inductor collection through shielding, converts to after FT3 form through optical fiber access combiner.
3, described high-power rectifier transformer differential protective system adopts digitlization combiner reception primary side, net side, valve side digital collection device to transmit FT3 form electric current, voltage signal, process through synchronous, multiple signals are converted to 9-2 message after merging, and finally send to pressure regulation change, rectifier transformer protective device by optical fiber;
4, described voltage regulating transformer protective device access primary side, net side, three side voltage, current signal, realizes the differential and primary side of voltage regulating transformer three sides, three side backup protections configuration.Rectifier transformer device Access Network side, current on valve side signal, realize rectifier transformer both sides differential protection.As shown in Figure 3.
Voltage regulating transformer protective device configures the main protections such as biased differential protection based on virtual braking principle, poor stream fast tripping protection, increment be differential; the backup protections such as primary side overcurrent protection, gap protection, overload, three side configuration overcurrent protections, the backup protections such as fast tripping protection, zero sequence overvoltage of prescribing a time limit.
Rectifier transformer protective device configures the main protections such as biased differential protection based on virtual braking principle, poor stream fast tripping protection, increment be differential, and rectification becomes the net side configuration backup protection such as fast tripping protection, overload protection in limited time.
5, described voltage regulating transformer protective device access pressure regulation becomes gear information; calculate in real time rectifier transformer net side (pressure regulation change secondary side) voltage and corresponding each lateral balance coefficient according to current operational taps, ensure the correctness that voltage regulating transformer differential current is calculated.
The first step is calculated the each phase winding voltage of net side and B, C A phase equilibrium coefficient relatively:
The current A phase voltage of rectifier transformer net side is: Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin,
The current B phase voltage of rectifier transformer net side 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 relatively A phase equilibrium coefficient are respectively: 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, and Xb is B phase gear, and Xc is C phase gear, and Ua is rectifier transformer net side A phase winding work at present voltage, and Ub is rectifier transformer net side A phase winding work at present voltage, and Uc is rectifier transformer net side A phase winding work at present voltage;
Second step calculates each side rated current and net side A phase equilibrium coefficient:
Press formula
the primary side secondary rated current calculating.
Wherein S
n, U
n, n
tA" transformer nameplate rated capacity " and " rated line voltage of primary side " and " the primary side TA no-load voltage ratio " in voltage regulating transformer device parameter
Press formula I
a=S
n/ (3*U
x* n
tA) calculate rectification and become net side A phase secondary specified phase current.
Wherein, S
n, n
tA, U
x" rectifier transformer nameplate rated capacity " and " net side TA no-load voltage ratio " and the calculating gained net side A phase winding voltage in system parameters.
Can net side A phase differential protection coefficient of balance be: k
phA=I
e/ I
a.
The 3rd step is calculated the each phase equilibrium coefficient of net side:
Net side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a
Net side B phase differential protection coefficient of balance is: k
phB=k
phA* (U
b/ U
a)
Net side C phase differential protection coefficient of balance is: k
phC=k
phA* (U
c/ U
a)
6, described rectifier transformer differential protection adopts distinctive phase shift algorithm to carry out phase compensation to electric current, adapts to the rectifier transformer of different phase shifting angles.
As shown in Figure 4,5, the mode of connection of the conventional rectifier transformer of large-scale smelting enterprise has three kinds: Y (moving)/Δ-11, Δ (moving)/Δ-10, Y (moving)/Y-12.
" Y (moving)/Δ-11 rectifier transformer longitudinal difference protection TA secondary current corner scheme: not corner of net side TA, valve side TA corner.
See Fig. 4,
leading is in same famous prime minister
phase angle be 30 °-α=22.5 °, α=+ 7.5 °;
not corner, will
30 °-α=22.5 ° that turn round, obtain formula (3).
---" Y (moving)/Δ " rectifier transformer valve side TA secondary side three-phase current (electric current before corner);
---participate in the three-phase current (corner after-current) of differential current computing;
" Δ (moving)/Δ-10 " rectifier transformer longitudinal difference protection, TA secondary current corner scheme, not corner of net side TA, valve side TA corner.
See Fig. 5,
leading in
phase angle difference be 60 °-α:
---Δ (moving)/Δ rectification becomes valve side TA secondary side three-phase current (electric current before corner);
---participate in the three-phase current (corner after-current) of differential current computing;
" Y (moving)/Y-12 rectifier transformer longitudinal difference protection TA secondary current corner scheme: not corner of net side TA, valve side TA corner.
After in formula, move α for just, reach α is for negative.
Claims (5)
1. a high-power rectifier transformer group differential protecting method, is characterized in that, comprises the steps:
First be that configuration protection device is carried out at a pressure regulation changing distance, two rectifier transformer intervals by rectifier transformer component, wherein the pressure regulation signal of pressure regulation changing distance protective device access voltage regulating transformer pressure regulation gear controller, primary side voltage and current signal, three side voltage and current signals, pressure regulation become secondary side current signal, and rectification changing distance protective device accesses rectifier transformer current on line side, current on valve side;
The first step: be to convert FT3 form current and voltage signals in rectification change current on line side signal access collector by primary side, three side electric current and voltages, secondary sides, then through optical fiber access digitlization combiner;
Second step: each side FT3 form voltage and current signal is carried out multichannel merging by digitlization combiner, and be converted to 9-2 message sends to voltage regulating transformer protective device through optical fiber by the electric current of collector input, information of voltage simultaneously after synchronous processing; Current voltage regulating transformer operational taps information accesses voltage regulating transformer protective device by gear controller after code value conversion;
The 3rd step: voltage regulating transformer protective device receives the each side current signal from digitlization combiner, calculates differential current, realizes voltage regulating transformer differential protection and backup protection correlation computations and judgement.
2. high-power rectifier transformer group differential protecting method as claimed in claim 1, is characterized in that, specifically comprises the steps:
The first step: at rectifier transformer valve side outlet copper bar, electronic current mutual inductor is installed and is gathered rectifier transformer current on valve side;
Second step: the current on valve side collecting and rectifier transformer current on line side are accessed to collector through shielded type cable, convert the electrical signal to FT3 form current and voltage signals, then through optical fiber access digitlization combiner;
The 3rd step: each side FT3 form voltage and current signal is carried out multichannel merging by digitlization combiner, and be converted to 9-2 message sends to rectifier transformer protective device through optical fiber by the electric current of collector input, information of voltage simultaneously after synchronous processing;
The 4th step: by each rectifier transformer side current signal access rectifier transformer protective device, calculate differential current, realize rectifier transformer differential protection and backup protection correlation computations and judgement.
3. high-power rectifier transformer group differential protecting method as claimed in claim 1; it is characterized in that: wherein voltage regulating transformer protective device access primary side, net side, three side voltage and current signals; thereby realize the differential and primary side of voltage regulating transformer three sides, three side backup protections; and rectifier transformer protective device Access Network side is pressure regulation change secondary side, rectifier transformer current on valve side signal, realize rectifier transformer both sides differential protection.
4. high-power rectifier transformer group differential protecting method as claimed in claim 1; it is characterized in that: wherein pressure regulation becomes protective device access pressure regulation and becomes gear information; calculate voltage and change in real time differential protection coefficient of balance along with gear regulates; thereby ensure the correctness of pressure regulation transformer differential Current calculation, specifically:
The first step: calculate the each phase winding voltage of net side and B, C A phase equilibrium coefficient relatively:
The current A phase voltage of rectifier transformer net side is: Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin, the current B phase voltage of rectifier transformer net side is: Ub=(Umax-Umin) * (N-Xb)/(N-1)+Umin, and rectifier transformer net side current C phase voltage is: Uc=(Umax-Umin) * (N-Xc)/(N-1)+Umin; Rectifier transformer net side B, C relatively A phase equilibrium coefficient are respectively: 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, and Xb is B phase gear, and Xc is C phase gear, and Ua is rectifier transformer net side A phase winding work at present voltage, and Ub is rectifier transformer net side A phase winding work at present voltage, and Uc is rectifier transformer net side A phase winding work at present voltage;
Second step: calculate each side rated current and net side A phase equilibrium coefficient:
Press formula
the primary side secondary rated current I calculating
e, wherein S
n, U
n, n
tA" transformer nameplate rated capacity " and " rated line voltage of primary side " and " the primary side TA no-load voltage ratio " in system parameters;
Press formula I
a=S
n/ (3*U
x* n
tA) calculate rectification and become net side A phase secondary specified phase current I
a, wherein, S
n, n
tA, U
x" rectifier transformer nameplate rated capacity " and " net side TA no-load voltage ratio " and the calculating gained net side A phase winding voltage in system parameters;
Can net side A phase differential protection coefficient of balance be: k
phA=I
e/ I
a;
The 3rd step is calculated the each phase equilibrium coefficient of net side:
Net side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a;
Net side B phase differential protection coefficient of balance is: k
phB=k
phA* (U
b/ U
a);
Net side C phase differential protection coefficient of balance is: k
phC=k
phA* (U
c/ U
a).
5. high-power rectifier transformer group differential protecting method as claimed in claim 2, is characterized in that: wherein rectifier transformer adopts phase shift algorithm to carry out phase compensation to electric current, thereby adapts to the rectifier transformer of different phase shifting angles:
The mode of connection of rectifier transformer is divided into three kinds, Y (moving)/Δ-11, Δ (moving)/Δ-10, Y (moving)/Y-12;
Wherein " Y (moving)/Δ-11 rectifier transformer longitudinal difference protection TA secondary current corner scheme: not corner of net side TA, valve side TA corner;
leading is in same famous prime minister
phase angle be 30 °-α=22.5 °, α=+ 7.5 °;
not corner, will
30 °-α=22.5 ° that turn round, obtain formula
---" Y (moving)/Δ " rectifier transformer valve side TA secondary side three-phase current is electric current before corner;
---the three-phase current that participates in differential current computing is corner after-current;
Wherein " Δ (moving)/Δ-10 " rectifier transformer longitudinal difference protection, TA secondary current corner scheme, not corner of net side TA, valve side TA corner;
leading in
phase angle difference be 60 °-α:
---it is electric current before corner that Δ (moving)/Δ rectification becomes valve side TA secondary side three-phase current;
---the three-phase current that participates in differential current computing is corner after-current;
α---Shifting Phase of Rectifier Transformer angle;
Wherein " Y (moving)/Y-12 rectifier transformer longitudinal difference protection TA secondary current corner scheme: not corner of net side TA, valve side TA corner;
After in formula, move α for just, reach α is for negative.
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| CN104215875A (en) * | 2014-09-25 | 2014-12-17 | 国家电网公司 | Monitor method of high power rectifier transformer unit rectifying valve breakdowns |
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| CN106384997A (en) * | 2016-11-22 | 2017-02-08 | 国网江苏省电力公司镇江供电公司 | Low-voltage side positive sequence clockwise and negative sequence anticlockwise compensation method for differential protection of transformers |
| CN106526433A (en) * | 2016-09-20 | 2017-03-22 | 海南电力技术研究院 | Transformer current waveform feature testing method and device |
| CN108551156A (en) * | 2018-05-08 | 2018-09-18 | 南京南瑞继保电气有限公司 | Adjustable transformer differential protecting method, device, system and computer storage media |
| 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 |
| CN112086935A (en) * | 2020-08-20 | 2020-12-15 | 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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| CN105406738A (en) * | 2015-12-23 | 2016-03-16 | 无锡江南计算技术研究所 | High-voltage rectification system for power supply to machine room |
| 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 |
| CN106526433A (en) * | 2016-09-20 | 2017-03-22 | 海南电力技术研究院 | Transformer current waveform feature testing method and device |
| CN106526433B (en) * | 2016-09-20 | 2019-05-21 | 海南电网有限责任公司电力科学研究院 | Transformer current wave character test method and device |
| CN106384997A (en) * | 2016-11-22 | 2017-02-08 | 国网江苏省电力公司镇江供电公司 | Low-voltage side positive sequence clockwise and negative sequence anticlockwise compensation method for differential protection of transformers |
| CN106384997B (en) * | 2016-11-22 | 2019-01-08 | 国网江苏省电力公司镇江供电公司 | Compensation method that transformer differential protection low-pressure side positive sequence negative phase-sequence clockwise is counterclockwise |
| CN108551156A (en) * | 2018-05-08 | 2018-09-18 | 南京南瑞继保电气有限公司 | Adjustable transformer differential protecting method, device, system and computer storage media |
| 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 |
| CN112086935A (en) * | 2020-08-20 | 2020-12-15 | 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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