CN102354953A - Electric-cooker transformer relay protecting system and method - Google Patents
Electric-cooker transformer relay protecting system and method Download PDFInfo
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- CN102354953A CN102354953A CN2011102998748A CN201110299874A CN102354953A CN 102354953 A CN102354953 A CN 102354953A CN 2011102998748 A CN2011102998748 A CN 2011102998748A CN 201110299874 A CN201110299874 A CN 201110299874A CN 102354953 A CN102354953 A CN 102354953A
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- 241001417490 Sillaginidae Species 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
The furnace transformer of a kind of property of chemical metallurgy sector application and structure; Mostly be Y/ Δ-11/ Δ-11 or Y/Y-12/ Δ-11 mode of connection; High side voltage is 35～220kV; The low-pressure side output voltage is tens volts to 200 volts; Directly the electric arc type electric furnace is given in power supply, produces high temperature and smelts ore.High side voltage is taken from electric power system, and is basicly stable, and low-pressure side voltage can be at the broad range internal pressure-regulating.
The furnace transformer pressure regulation is different with common power transformer.Common electric power transformer on-load voltage regulating scope little (about 5%); Transformer differential protection is not introduced the on-load voltage regulation gear information; Be not consider the pressure regulation gear in the software; Directly calculate the current balance type coefficient according to the transformer nominal parameter, and escape the unsymmetrical current that the on-load voltage regulation scope causes through suitable raising differential protection threshold.
And furnace transformer on-load voltage regulation wide ranges (with certain furnace transformer is example; Low-pressure side rated voltage 204V; Be limited to 240V in the pressure regulation; Under be limited to 138V); Every phase furnace transformer has 35 grades of pressure regulation; The gear of every phase is also inequality in the furnace transformer running, and 3 single-phase electricfurnace transformers amount to nearly 105 grades on-load voltage regulation gear.Furnace transformer generally adopts motor-operating mechanism to control pressure regulation.If differential protection adopts the fixedly calculating of the coefficient of balance participation differential current calculated of transformation-ratio meter of transformer first and second winding; When then the 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 differential protection when the transformer troubles inside the sample space, to lose sensitivity again.Therefore, be used for the differential protection device of furnace transformer must be in real time according to the coefficient of balance of transformer on-load voltage regulating gear computer differential protection.
Summary of the invention
The purpose 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 realizing above-mentioned purpose, method scheme of the present invention is: a kind of furnace transformer relay protecting method, and step is following:
A carries out binary coding with the gear information of on-load voltage regulation controller output, converts corresponding binary system code system gear information into;
B is transported to relay protection device with said binary system code system gear information, and relay protection device is decoded, and obtains corresponding actual-gear information;
C, relay protection device be according to each phase low-pressure side voltage under the current gear of actual-gear information calculations, and calculate each phase equilibrium coefficient;
D is according to the real-time computer differential protective current of every phase equilibrium coefficient.
Said binary code is made as binary-coded decimal system.Step C was divided into for three steps, and the first step is: at first according to each phase low-pressure side voltage of actual-gear information calculations, and calculate low-pressure side B, C phase relatively low pressure side A phase equilibrium coefficient; Second step was: be reference current with the high voltage side current, in conjunction with furnace transformer calculation of parameter low-pressure side A phase equilibrium coefficient; The 3rd step was: low-pressure side A phase differential protection coefficient of balance multiplies each other with low-pressure side B, the mutually relative A phase equilibrium coefficient of C respectively and obtains low-pressure side B, C phase differential protection coefficient of balance.The said 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 A phase equilibrium coefficient relatively are respectively: Ub/Ua, Uc/Ua; The low-pressure side minimum voltage is Umin, and ceiling voltage is Umax; The total gear of pressure regulation is N; Xa is an A phase gear, and Xb is a B phase gear, and Xc is a C phase gear, and Ua is a low-pressure side A phase winding work at present voltage, and Ub is a low-pressure side A phase winding work at present voltage, and Uc is a low-pressure side A phase winding work at present voltage;
Second step was:
According to the formula
The calculated pressure side secondary rated current.
S wherein
n, U
n, n
TABe that " transformer nameplate rated capacity " and " rated line voltage in high-pressure side " in the system parameters reaches " high-pressure side TA no-load voltage ratio "
I by formula
A=S
n/ (3*U
x* n
TA) calculate the specified phase current of low-pressure side A phase secondary.
Wherein, S
n, n
TA, U
x, be " transformer nameplate rated capacity " and " low-pressure side TA no-load voltage ratio " and the low-pressure side A phase winding rated voltage in the system parameters.
Can get low-pressure side A phase differential protection coefficient of balance is: k
PhA=I
e/ I
A
The 3rd step was:
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 furnace transformer relaying protection system; The electronic current transducer of three-phase furnace step down side is connected to differential protection device through analog acquisition equipment; And the equal correspondence of each transformer is provided with the voltage adjustment of on-load controller; Said on-load voltage regulation controller carries out binary coding with transformer real time execution gear; Export the gear acquisition module that connects in the differential protection device with the relay tip mode, relay tip quantity reflects coding form and the gear quantity that said binary coding adopts; Said gear acquisition module is used to the gear information of decoding, and is transferred to differential protection device.
Said binary code is made as binary-coded decimal system.
Furnace transformer generally is installed in smelting or the chemical industry factory building; The controller of control furnace transformer motor-operating mechanism is installed in the controlling of production process chamber; This controller possesses the code system translation function; Can convert multistage on-load voltage regulation gear into the coded message of certain code system, coded message is transferred to relay protection device 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,, just require relay protection device must possess 105 switch value input interface if do not carry out encoding process.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 installed in the substation relay protection control room, and the gear information after the code system conversion can be connected to the protection equipment in the relaying protection control room through cable.
Description of drawings
Fig. 1 is a relaying protection system sketch map of the present invention;
Fig. 2 is the connection layout of differential protection device and on-load voltage regulation controller;
Fig. 3 is a gear acquisition module winding diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
Method embodiment
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; Decode by relay protection device; The current gear information that reduction is actual; Press the coefficient of balance of computer differential protection in real time mutually then, be used for protection.Step is following:
A carries out binary coding with the gear information of on-load voltage regulation controller output, converts corresponding binary system code system gear information into;
B is transported to relay protection device with said binary system code system gear information, and relay protection device is decoded, and obtains corresponding actual-gear information;
C, relay protection device be according to each phase low-pressure side voltage under the current gear of actual-gear information calculations, and calculate each phase equilibrium coefficient;
D is according to the real-time computer differential protective current of every phase equilibrium coefficient.
Embodiment is following, 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 35 grades on-load voltage regulation gear information code system and converts binary-coded decimal into.Every phase gear information is with 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.Like figure
(2) protection equipment is introduced the binary-coded decimal information after code system is changed, and decodes according to following principle.
Every phase gear information is with 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) calculate each phase low-pressure side voltage under the current gear according to gear information, and calculate low-pressure side B, C phase relatively low pressure side A phase equilibrium coefficient.The definite value of setting is: the 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 A phase equilibrium coefficient relatively are respectively: Ub/Ua, Uc/Ua;
Xa is an A phase gear, and Xb is a B phase gear, and Xc is a C phase gear, and Ua is a low-pressure side A phase winding work at present voltage, and Ub is a low-pressure side A phase winding work at present voltage, and Uc is a low-pressure side A phase winding work at present voltage.
Low-pressure side B, C A phase equilibrium coefficient relatively are respectively: Ub/Ua, Uc/Ua.
(4) with the high voltage side current be reference current, in conjunction with furnace transformer calculation of parameter low-pressure side A phase equilibrium coefficient.
S wherein
n, U
n, n
TABe that " transformer nameplate rated capacity " and " rated line voltage in high-pressure side " in the system parameters reaches " high-pressure side TA no-load voltage ratio "
I by formula
A=S
n/ (3*U
x* n
TA) calculate the specified phase current of low-pressure side A phase secondary.
Wherein, S
n, n
TA, U
x, be " transformer nameplate rated capacity " and " low-pressure side TA no-load voltage ratio " and the low-pressure side A phase winding rated voltage in the system parameters.
Can get 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 multiplies each other with low-pressure side B, the mutually relative A phase equilibrium coefficient of C respectively and obtains 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
Ph=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
Like Fig. 1 is relaying protection system sketch map of the present invention.Three single-phase electricfurnace step down sides are installed electronic current mutual inductor; Electronic current mutual inductor is transferred to analog acquisition equipment with the low-pressure side current information of gathering, and is digital signal and passes through Optical Fiber Transmission to differential protection device through the analog acquisition device translates.Improvement of the present invention is; Differential protection device also is connected with the on-load voltage regulation controller that contains the code system translation function; This on-load voltage regulation controller is by be provided with mutually, outputs to the gear acquisition module in the differential protection device with the relay tip mode after converting transformer real time execution gear into binary-coded decimal.Like Fig. 2, shown in Figure 3, be example with every phase 35 retainings, then whenever need 6 relay tips mutually altogether.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 (is example with A mutually).Differential protection device is decoded the gear information of gear acquisition module collection according to cryptoprinciple, reduce current gear.
Table 1
Claims (6)
1. furnace transformer relay protecting method is characterized in that step is following:
A carries out binary coding with the gear information of on-load voltage regulation controller output, converts corresponding binary system code system gear information into;
B is transported to relay protection device with said binary system code system gear information, and relay protection device is decoded, and obtains corresponding actual-gear information;
C, relay protection device be according to each phase low-pressure side voltage under the current gear of actual-gear information calculations, and calculate each phase equilibrium coefficient;
D is according to the real-time computer differential protective current of every phase equilibrium coefficient.
2. a kind of furnace transformer relay protecting method according to claim 1 is characterized in that said binary code is made as binary-coded decimal system.
3. a kind of furnace transformer relay protecting method according to claim 1 is characterized in that step C was divided into for three steps,
The first step is: at first according to each phase low-pressure side voltage of actual-gear information calculations, and calculate low-pressure side B, C phase relatively low pressure side A phase equilibrium coefficient;
Second step was: be reference current with the high voltage side current, in conjunction with furnace transformer calculation of parameter low-pressure side A phase equilibrium coefficient;
The 3rd step was: low-pressure side A phase differential protection coefficient of balance multiplies each other with low-pressure side B, the mutually relative A phase equilibrium coefficient of C respectively and obtains low-pressure side B, C phase differential protection coefficient of balance.
4. a kind of furnace transformer relay protecting method according to claim 3 is characterized in that the said 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 A phase equilibrium coefficient relatively are respectively: Ub/Ua, Uc/Ua; The low-pressure side minimum voltage is Umin, and ceiling voltage is Umax; The total gear of pressure regulation is N; Xa is an A phase gear, and Xb is a B phase gear, and Xc is a C phase gear, and Ua is a low-pressure side A phase winding work at present voltage, and Ub is a low-pressure side A phase winding work at present voltage, and Uc is a low-pressure side A phase winding work at present voltage;
Second step was:
According to the formula
calculate the high side of the secondary rated current.
S wherein
n, U
n, n
TABe that " transformer nameplate rated capacity " and " rated line voltage in high-pressure side " in the system parameters reaches " high-pressure side TA no-load voltage ratio "
I by formula
A=S
n/ (3*U
x* n
TA) calculate the specified phase current of low-pressure side A phase secondary.
Wherein, S
n, n
TA, U
x, be " transformer nameplate rated capacity " and " low-pressure side TA no-load voltage ratio " and the low-pressure side A phase winding rated voltage in the system parameters.
Can get low-pressure side A phase differential protection coefficient of balance is: k
PhA=I
e/ I
A
The 3rd step was:
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)
5. furnace transformer relaying protection system of method according to claim 1; The electronic current transducer of three-phase furnace step down side is connected to differential protection device through analog acquisition equipment; And the equal correspondence of each phase transformer is provided with the voltage adjustment of on-load controller; It is characterized in that; Said on-load voltage regulation controller carries out binary coding with transformer real time execution gear; Export the gear acquisition module that connects in the differential protection device with the relay tip mode, relay tip quantity reflects coding form and the gear quantity that said binary coding adopts; Said gear acquisition module is used to the gear information of decoding, and is transferred to differential protection device.
6. furnace transformer relaying protection system according to claim 5 is characterized in that said 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 true CN102354953A (en) | 2012-02-15 |
| CN102354953B CN102354953B (en) | 2014-03-05 |
Family
ID=45578477
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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) |
Cited By (8)
| 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 |
| CN103560487A (en) * | 2013-11-19 | 2014-02-05 | 国家电网公司 | Differential protection method of multi-tap special transformer |
| CN105024349A (en) * | 2015-07-15 | 2015-11-04 | 南京国电南自电网自动化有限公司 | Gear variation tracking-based extra-high voltage on-load tap changer protecting method |
| CN107607767A (en) * | 2017-08-17 | 2018-01-19 | 国家电网公司 | A kind of all -fiber furnace transformer low-pressure side Super-Current Measurement method |
| CN108494085A (en) * | 2018-04-13 | 2018-09-04 | 山东中实易通集团有限公司 | It is a kind of to become the voltage-regulating system and method for having and carrying transformer based on high factory |
| CN110196370A (en) * | 2019-06-26 | 2019-09-03 | 山东电工电气集团智能电气有限公司 | The monitoring method and device of transformer |
| 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 |
| 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 |
Families Citing this family (1)
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| 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 |
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Cited By (13)
| 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 |
| CN103560487A (en) * | 2013-11-19 | 2014-02-05 | 国家电网公司 | Differential protection method of multi-tap special transformer |
| CN103560487B (en) * | 2013-11-19 | 2016-02-03 | 国家电网公司 | Many taps special transformer differential protecting method |
| CN105024349A (en) * | 2015-07-15 | 2015-11-04 | 南京国电南自电网自动化有限公司 | Gear variation tracking-based extra-high voltage on-load tap changer 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 |
| CN107607767A (en) * | 2017-08-17 | 2018-01-19 | 国家电网公司 | A kind of all -fiber furnace transformer low-pressure side Super-Current Measurement method |
| CN108494085A (en) * | 2018-04-13 | 2018-09-04 | 山东中实易通集团有限公司 | It is a kind of to become the voltage-regulating system and method for having and carrying transformer based on high factory |
| 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 |
| CN110196370A (en) * | 2019-06-26 | 2019-09-03 | 山东电工电气集团智能电气有限公司 | The monitoring method and device of 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 |
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102354953B (en) | 2014-03-05 |
| WO2013044556A1 (en) | 2013-04-04 |
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