CN102354953B - Electric-cooker transformer relay protecting method - Google Patents
Electric-cooker transformer relay protecting method Download PDFInfo
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- CN102354953B CN102354953B CN201110299874.8A CN201110299874A CN102354953B CN 102354953 B CN102354953 B CN 102354953B CN 201110299874 A CN201110299874 A CN 201110299874A CN 102354953 B CN102354953 B CN 102354953B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims description 14
- 229910002056 binary alloy Inorganic materials 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
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Abstract
The invention relates to an electric-cooker transformer relay protecting system and a method. A electronic current transformer at the low-voltage side of three single-phase electric-cooker transformers is connected to a differential protecting device through an analog collecting device, each transformer is correspondently provided with an on-load voltage regulation controller, the binary coding of real-time operation levels of the transformers is completed by all on-load voltage regulation controllers, each on-load voltage regulation controller is connected with a level collecting module inside the differential protecting device through a relay contact way, and the quantity of the relay contacts reflects a coding form and a level quantity adopted by the binary coding; and the level collecting module is used for decoding the level information and transmitting the level information to the differential protecting device. Due to the adoption of the electric-cooker transformer relay protecting system and the method, the level information can be transmitted to the relay protecting device for use without collecting a great amount of switching values, and the real-time performance can be guaranteed.
Description
Technical field
The present invention relates to furnace transformer differential protection field.
Background technology
Metallurgical and chemical industry is applied the furnace transformer of a kind of property and structure, mostly be △-11, Y/ △-11/ or Y/Y-12/ △-11 mode of connection, high side voltage is 35～220kV, low-pressure side output voltage is tens volts to 200 volts, directly power supply, to electric arc type electric furnace, produces high temperature and smelts ore.High side voltage is taken from electric power system, basicly stable, and low-pressure side voltage can be at broad range internal pressure-regulating.
Furnace transformer pressure regulation is different from common power transformer.Common power transformer on-load voltage regulation scope little (approximately 5%); transformer differential protection is not introduced on-load voltage regulation gear information; be in software, not consider pressure regulation gear; according to transformer nominal parameter, directly calculate current balance type coefficient, and escape by suitable raising differential protection threshold the unsymmetrical current that on-load voltage regulation scope causes.
And furnace transformer on-load voltage regulation wide ranges (be take certain furnace transformer as example, low-pressure side rated voltage 204V, in pressure regulation, be limited to 240V, under be limited to 138V), every phase furnace transformer has 35 grades of pressure regulation, in furnace transformer running, the gear of every phase is also not identical, and 3 single-phase electric furnace transformers amount to the nearly on-load voltage regulation gear of 105 grades.Furnace transformer generally adopts motor-operating mechanism to control pressure regulation.If differential protection adopts the transformer first and second winding coefficient of balance that fixedly transformation-ratio meter is calculated to participate in the calculating of differential current; when low-pressure side working voltage is not rated voltage; will calculate differential current; be 30% of rated current to the maximum; will certainly cause the malfunction of differential protection; as raise differential protection electric current threshold, can cause again differential protection when transformer troubles inside the sample space, to lose sensitivity.Therefore, the differential protection device for furnace transformer must calculate the coefficient of balance of differential protection in real time according to transformer on-load voltage regulating gear.
Summary of the invention
The object of this invention is to provide a kind of relaying protection system and method, in order to solve the differential protection problem of multistage gear on-load tap-changing transformer.Based on this method, the present invention also provides a kind of relaying protection system.
For achieving the above object, method scheme of the present invention is: a kind of furnace transformer relay protecting method, and step is as follows:
A, carries out binary coding by the gear information of on-load voltage regulation controller output, is converted to corresponding binary system code system gear information;
B, is transported to relay protection device by described binary system code system gear information, and relay protection device is decoded, and obtains corresponding actual-gear information;
C, relay protection device calculates each phase low-pressure side voltage under current gear according to actual-gear information, and calculates each phase equilibrium coefficient;
D, calculates differential protection electric current in real time according to every phase equilibrium coefficient.
Described binary code is made as binary-coded decimal system.Step C is divided into three steps, and the first step is: first according to actual-gear information, calculate each phase low-pressure side voltage, and calculate low-pressure side B, C phase relatively low pressure side A phase equilibrium coefficient; Second step is: take high voltage side current as reference current, in conjunction with furnace transformer calculation of parameter low-pressure side A phase equilibrium coefficient; The 3rd step is: low-pressure side A phase differential protection coefficient of balance respectively A phase equilibrium coefficient mutually relative to low-pressure side B, C multiplies each other and obtains low-pressure side B, C phase differential protection coefficient of balance.
The described first step is:
The current A phase voltage of low-pressure side is: Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin,
The current B phase voltage of low-pressure side is: Ub=(Umax-Umin) * (N-Xb)/(N-1)+Umin,
Low-pressure side current C phase voltage is: Uc=(Umax-Umin) * (N-Xc)/(N-1)+Umin;
Low-pressure side B, C relatively A phase equilibrium coefficient are respectively: Ub/Ua, Uc/Ua;
Low-pressure 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 low-pressure side A phase winding work at present voltage, and Ub is low-pressure side B phase winding work at present voltage, and Uc is low-pressure side C phase winding work at present voltage;
Second step is:
Press formula
calculate high-pressure side secondary rated current.
S wherein
n, U
n" the transformer nameplate rated capacity " and " one time, high-pressure side rated line voltage " in system parameters.
Press formula I
a=S
n/ (3*U
x* low-pressure side TA no-load voltage ratio) calculate the specified phase current of low-pressure side A phase secondary.
Wherein, S
n, U
x" transformer nameplate rated capacity " and the low-pressure side A phase winding rated voltage in system parameters.
Can obtain low-pressure side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a.
The 3rd step is:
Low-pressure side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a
Low-pressure side B phase differential protection coefficient of balance is: k
phB=k
phA* (U
b/ U
a)
Low-pressure side C phase differential protection coefficient of balance is: k
phC=k
phA* (U
c/ U
a)
System schema of the present invention is: a kind of electric-cooker transformer relay protecting system, the electronic current transducer of three-phase furnace step down side passes through analog acquisition equipment connection to differential protection device, and the equal correspondence of each transformer is provided with voltage adjustment of on-load controller, described on-load voltage regulation controller carries out binary coding by transformer real time execution gear, in relay tip mode, export the gear acquisition module connecting in differential protection device, relay tip quantity reflects coding form and the numbers of gear steps that described binary coding adopts; Described gear acquisition module, for the gear information of decoding, is transferred to differential protection device.
Described binary code is made as binary-coded decimal system.
Furnace transformer is generally arranged in smelting or chemical factory; the controller of controlling furnace transformer motor-operating mechanism is arranged on controlling of production process chamber; this controling appliance is for code system translation function; multistage on-load voltage regulation gear can be converted to the coded message of certain code system, coded message be transferred to relay protection device and decode and be reduced to actual-gear information.
For 35 grades of on-load voltage regulation gears of every phase of furnace transformer motor-operating mechanism controller output are linked into relay protection device, if do not encode processing, just require relay protection device must possess 105 switch value input interface.This hardware resource to relay protection device has caused great burden.And mode of the present invention does not need a large amount of switch acquisitions, just gear information can be transferred to relay protection device utilization, and can guarantee real-time.Protection equipment is arranged in substation relay protection control room, and the gear information after code system conversion can be connected to the protection equipment in relay protection and control chamber by cable.
Accompanying drawing explanation
Fig. 1 is relaying protection system schematic diagram of the present invention;
Fig. 2 is the connection layout of differential protection device and on-load voltage regulation controller;
Fig. 3 is gear acquisition module winding diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Embodiment of the method
Main points of the present invention are; gear information after the code system conversion of furnace transformer on-load voltage regulation controller output is transferred to relay protection device easily; by relay protection device, decoded; the current gear information that reduction is actual; then by calculating in real time mutually differential protection coefficient of balance, for the protection of.Step is as follows:
A, carries out binary coding by the gear information of on-load voltage regulation controller output, is converted to corresponding binary system code system gear information;
B, is transported to relay protection device by described binary system code system gear information, and relay protection device is decoded, and obtains corresponding actual-gear information;
C, relay protection device calculates each phase low-pressure side voltage under current gear according to actual-gear information, and calculates each phase equilibrium coefficient;
D, calculates differential protection electric current in real time according to every phase equilibrium coefficient.
Embodiment is as follows, and the furnace transformer of selection has 35 grades of on-load voltage regulation gears of every phase, and the binary-coded decimal system of selection is carried out coding and decoding.
(1) every phase furnace transformer reaches the on-load voltage regulation gear information code system of 35 grades and is converted to binary-coded decimal.Every phase gear information 6(A
6a
5a
4a
3a
2a
1) individual binary number representation, wherein the highest two (A
6a
5be 3 to the maximum) tens of 8421 representation gears, low four (A
4a
3a
2a
1be 9 to the maximum) units of 8421 representation gears.As figure
(2) protection equipment is introduced the binary-coded decimal information after code system conversion, according to following principle, decodes.
Every phase gear information 6(A
6a
5a
4a
3a
2a
1) individual binary number representation, wherein the highest two (A
6a
5be 3 to the maximum) tens of 8421 representation gears, low four (A
4a
3a
2a
1be 9 to the maximum) units of 8421 representation gears.
(3) according to gear information, calculate each phase low-pressure side voltage under current gear, and calculate low-pressure side B, C phase relatively low pressure side A phase equilibrium coefficient.The definite value of setting is: low-pressure side minimum voltage is Umin, and ceiling voltage is Umax; The total gear N of pressure regulation.
The current A phase voltage of low-pressure side is: Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin,
The current B phase voltage of low-pressure side is: Ub=(Umax-Umin) * (N-Xb)/(N-1)+Umin,
Low-pressure side current C phase voltage is: Uc=(Umax-Umin) * (N-Xc)/(N-1)+Umin;
Low-pressure side B, C relatively A phase equilibrium coefficient are respectively: Ub/Ua, Uc/Ua;
Xa is A phase gear, and Xb is B phase gear, and Xc is C phase gear, and Ua is low-pressure side A phase winding work at present voltage, and Ub is low-pressure side B phase winding work at present voltage, and Uc is low-pressure side C phase winding work at present voltage.
Low-pressure side B, C relatively A phase equilibrium coefficient are respectively: Ub/Ua, Uc/Ua.
(4) take high voltage side current as reference current, in conjunction with furnace transformer calculation of parameter low-pressure side A phase equilibrium coefficient.
Press formula
calculate high-pressure side secondary rated current.
S wherein
n, U
n" the transformer nameplate rated capacity " and " one time, high-pressure side rated line voltage " in system parameters.
Press formula I
a=S
n/ (3*U
x* low-pressure side TA no-load voltage ratio) calculate the specified phase current of low-pressure side A phase secondary.
Wherein, S
n, U
x" transformer nameplate rated capacity " and the low-pressure side A phase winding rated voltage in system parameters.
Can obtain low-pressure side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a.
(5) low-pressure side A phase differential protection coefficient of balance respectively A phase equilibrium coefficient mutually relative to low-pressure side B, C multiply each other and obtain low-pressure side B, C phase differential protection coefficient of balance.
Low-pressure side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a
Low-pressure side B phase differential protection coefficient of balance is: k
phB=k
phA* (U
b/ U
a)
Low-pressure side C phase differential protection coefficient of balance is: k
phC=k
phA* (U
c/ U
a)
System embodiment
If Fig. 1 is relaying protection system schematic diagram of the present invention.Three single-phase electric furnace transformer low-pressure sides are installed electronic current mutual inductor; electronic current mutual inductor is transferred to analog acquisition equipment by the low-pressure side current information of collection, by analog acquisition device translates, is digital signal and is arrived differential protection device by Optical Fiber Transmission.Improvement of the present invention is; differential protection device is also connected with the on-load voltage regulation controller containing code system translation function; this on-load voltage regulation controller is by arranging mutually, outputs to the gear acquisition module in differential protection device after transformer real time execution gear is converted to binary-coded decimal in relay tip mode.As shown in Figure 2 and Figure 3, every phase 35 gears of take are example, often need altogether mutually 6 relay tips.Table 1 has shown that the original gear of gear controller, coding principle and binary-coded decimal and collection open into module terminals corresponding relation (A of take is example mutually).Differential protection device is decoded the gear information of gear acquisition module collection according to cryptoprinciple, reduce current gear.
Table 1
Claims (2)
1. a furnace transformer relay protecting method, is characterized in that, step is as follows:
A, carries out binary coding by the gear information of on-load voltage regulation controller output, is converted to corresponding binary system code system gear information;
B, is transported to relay protection device by described binary system code system gear information, and relay protection device is decoded, and obtains corresponding actual-gear information;
C, relay protection device calculates each phase low-pressure side voltage under current gear according to actual-gear information, and calculates each phase equilibrium coefficient;
D, calculates differential protection electric current in real time according to every phase equilibrium coefficient;
Step C is divided into three steps,
The first step is: first according to actual-gear information, calculate each phase low-pressure side voltage, and calculate low-pressure side B, C phase relatively low pressure side A phase equilibrium coefficient;
Second step is: take high voltage side current as reference current, in conjunction with furnace transformer calculation of parameter low-pressure side A phase differential protection coefficient of balance;
The 3rd step is: low-pressure side A phase differential protection coefficient of balance respectively A phase equilibrium coefficient mutually relative to low-pressure side B, C multiplies each other and obtains low-pressure side B, C phase differential protection coefficient of balance;
The described first step is:
The current A phase voltage of low-pressure side is: Ua=(Umax-Umin) * (N-Xa)/(N-1)+Umin,
The current B phase voltage of low-pressure side is: Ub=(Umax-Umin) * (N-Xb)/(N-1)+Umin,
Low-pressure side current C phase voltage is: Uc=(Umax-Umin) * (N-Xc)/(N-1)+Umin;
Low-pressure side B, C relatively A phase equilibrium coefficient are respectively: Ub/Ua, Uc/Ua;
Low-pressure 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 low-pressure side A phase winding work at present voltage, and Ub is low-pressure side B phase winding work at present voltage, and Uc is low-pressure side C phase winding work at present voltage;
Second step is:
Press formula
calculate high-pressure side secondary rated current;
S wherein
n, U
n" the transformer nameplate rated capacity " and " one time, high-pressure side rated line voltage " in system parameters;
Press formula I
a=S
n/ (3*U
x* low-pressure side TA no-load voltage ratio) calculate the specified phase current of low-pressure side A phase secondary;
Wherein, S
n, U
x" transformer nameplate rated capacity " and the low-pressure side A phase winding rated voltage in system parameters; Can obtain low-pressure side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a;
The 3rd step is:
Low-pressure side A phase differential protection coefficient of balance is: k
phA=I
e/ I
a
Low-pressure side B phase differential protection coefficient of balance is: k
phB=k
phA* (U
b/ U
a)
Low-pressure side C phase differential protection coefficient of balance is: k
phC=k
phA* (U
c/ U
a).
2. a kind of furnace transformer relay protecting method according to claim 1, is characterized in that, described binary code is made as binary-coded decimal system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110299874.8A CN102354953B (en) | 2011-09-28 | 2011-09-28 | Electric-cooker transformer relay protecting method |
| PCT/CN2011/083164 WO2013044556A1 (en) | 2011-09-28 | 2011-11-29 | Relay protection method for electric furnace transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110299874.8A CN102354953B (en) | 2011-09-28 | 2011-09-28 | Electric-cooker transformer relay protecting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102354953A CN102354953A (en) | 2012-02-15 |
| CN102354953B true CN102354953B (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110299874.8A Expired - Fee Related CN102354953B (en) | 2011-09-28 | 2011-09-28 | Electric-cooker transformer relay protecting method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102354953B (en) |
| WO (1) | WO2013044556A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457242A (en) * | 2013-08-08 | 2013-12-18 | 许继集团有限公司 | Electric furnace transformer longitudinal differential protection secondary current compensation method |
| CN104572652A (en) * | 2013-10-11 | 2015-04-29 | 南京南瑞继保电气有限公司 | Method for demonstrating verification result of protection coordination relationship based on geographic wiring diagram |
| CN103560487B (en) * | 2013-11-19 | 2016-02-03 | 国家电网公司 | Many taps special transformer differential protecting method |
| CN105024349B (en) * | 2015-07-15 | 2017-12-12 | 南京国电南自电网自动化有限公司 | A kind of extra-high voltage on-load voltage regulation based on tracking gear change becomes guard method |
| CN107607767B (en) * | 2017-08-17 | 2019-12-24 | 国家电网公司 | All-fiber electric furnace transformer low-voltage side heavy current measuring method |
| CN108494085B (en) * | 2018-04-13 | 2024-04-05 | 山东中实易通集团有限公司 | Voltage regulating system and method based on high-power-plant variable on-load transformer |
| CN110196370B (en) * | 2019-06-26 | 2021-05-04 | 山东电工电气集团智能电气有限公司 | Transformer monitoring method and device |
| 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 |
| CN114441827A (en) * | 2021-12-22 | 2022-05-06 | 新疆升晟股份有限公司 | Method for measuring current at low-voltage end of electric furnace transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2336385Y (en) * | 1997-09-24 | 1999-09-01 | 周宏铎 | Microcomputerized automatic testing and handling device for taps of transformer |
| CN101286722A (en) * | 2007-04-09 | 2008-10-15 | 咸日常 | Step control device and control method for antiskid crosspiece of loaded pressure regulating switch of transformer |
| CN101719656A (en) * | 2009-12-23 | 2010-06-02 | 北京交通大学 | Adjusting method of differential protection during voltage adjustment of on-load transformer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006217743A (en) * | 2005-02-04 | 2006-08-17 | Toyota Motor Corp | Electric load control device |
| CN101800416B (en) * | 2010-04-27 | 2012-07-04 | 宁夏回族自治区电力公司 | Transverse differential protection method of neutral point of electric furnace transformer |
| CN101800415B (en) * | 2010-04-27 | 2012-07-04 | 宁夏回族自治区电力公司 | Longitudinal differential protection method of electric furnace transformer |
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2011
- 2011-09-28 CN CN201110299874.8A patent/CN102354953B/en not_active Expired - Fee Related
- 2011-11-29 WO PCT/CN2011/083164 patent/WO2013044556A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2336385Y (en) * | 1997-09-24 | 1999-09-01 | 周宏铎 | Microcomputerized automatic testing and handling device for taps of transformer |
| CN101286722A (en) * | 2007-04-09 | 2008-10-15 | 咸日常 | Step control device and control method for antiskid crosspiece of loaded pressure regulating switch of transformer |
| CN101719656A (en) * | 2009-12-23 | 2010-06-02 | 北京交通大学 | Adjusting method of differential protection during voltage adjustment of on-load transformer |
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| Title |
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| 基于电子式互感器的电炉变压器差动保护研究;邓茂军等;《电力系统保护与控制》;20110501;第39卷(第9期);第114-118、124页 * |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102354953A (en) | 2012-02-15 |
| WO2013044556A1 (en) | 2013-04-04 |
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