CN201276587Y - Soaking zone electric heater electrical leakage and heat load balance prewarning apparatus of cold rolling continuous annealing furnace - Google Patents
Soaking zone electric heater electrical leakage and heat load balance prewarning apparatus of cold rolling continuous annealing furnace Download PDFInfo
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- CN201276587Y CN201276587Y CNU2008201524324U CN200820152432U CN201276587Y CN 201276587 Y CN201276587 Y CN 201276587Y CN U2008201524324 U CNU2008201524324 U CN U2008201524324U CN 200820152432 U CN200820152432 U CN 200820152432U CN 201276587 Y CN201276587 Y CN 201276587Y
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Abstract
The utility model discloses an electric heater creepage and heat load leveling pre-warning device at a soaking section of a cold rolling continuity annealing furnace, comprising a plurality of electric heaters, and each electric heater is composed of a delta connection which is formed by three groups of the electric heaters and an electric heat tape powered by three phase power supply, and the input end and the output end of the electric heat tape are respectively connected with current transformators in series; the device further comprises a signal input module, a signal processing module and an execution module; the signal input module collects the current transformator signals and carries out amplification shaping and analog-to-digital conversion; the signal processing module carries out signal data processing of the signal input module, and carries out comparison of input and output current of the electric heat tape and electric power operation; the execution module receives the signal data of the signal processing module and carries out creepage or heat load leveling pre-warning, and the electric heater is correspondingly adjusted by a controller. The device can monitor creepage value of the electric heat tape in each electric heater in an electric heating system of the soaking section of the cold rolling continuity annealing furnace in a real-time manner, and gives electric heat tape creepage and heat load leveling pre-warning, thus ensuring normal operation of the device.
Description
Technical field
The utility model relates to the cold rolling company of a kind of metallurgy industry and moves back electric leakage of stove soaking zone electric heater and thermal load balance prior-warning device.
Background technology
Usually, the type of heating that the stove soaking zone moves back in cold rolling company is the electric heater heating of adopting some parallel connections, and electric heater is made up of three groups of ribbon heaters, and three groups of ribbon heaters constitute delta connection and adopt three phase supply.Each ribbon heater of this electric heater is when cold conditions, and its insulation against ground should be more than 2M Ω, often occurs the minor insulation generation leaky that descends significantly in the actual use of stove soaking zone but move back in cold rolling company, causes in the stove temperature distributing disproportionation thermal load unbalance; Serious electric heater and the inner lining of furnace plate localized burn of causing influences the normal operation of equipment;
In electric heater three-phase trilateral power supply mode, each ribbon heater current in loop value should equate in theory, if electric leakage appears in the isolator in wherein one or more loops, ribbon heater, then three-phase current in loop value will occur uneven, the ribbon heater electric power of isolator electric leakage reduces thus, has influenced the balance of thermal load in the stove.
At present, cold rolling monitoring of moving back stove soaking zone electric heater all is the concentrated monitoring of whole electric heating system usually, and the unusual early warning of thermal equilibrium in the stove is moved back by the shunt monitoring and the cold rolling company that do not have each each ribbon heater of electric heater.Electric heating system concentrate monitoring can't each electric heater of fast monitored in leaky in each loop, ribbon heater; When moving back the local generation of stove soaking zone electric heater leakage current when cold rolling company, the heater temperature that produces electric leakage transfers not get on, and under the constant situation of total power, the phenomenon that temperature raises may appear in the electric heater that electric leakage does not take place, temperature equalisation can be destroyed in the stove, it is inhomogeneous to cause steel band to be heated, and abnormal qualities such as warpage, shape wave occur.Concentrated monitoring is only just sent warning in the electric leakage of whole electric heating system after to a certain degree, and thermal load balance in the stove is in runaway condition.
Summary of the invention
Technical problem to be solved in the utility model provides the cold rolling company of a kind of metallurgy industry and moves back electric leakage of stove soaking zone electric heater and thermal load balance prior-warning device, utilize this device can monitor cold rolling company in real time and move back in the stove soaking zone electric heating system electrical leakage of ribbon heater in each electrically heated loop, judge thermal load balance in the stove according to electrical leakage, and provide ribbon heater electric leakage and the early warning of thermal load balance, guaranteed the normal operation and the steel band quality of equipment.
For solving the problems of the technologies described above, the electric leakage of stove soaking zone electric heater is moved back by the cold rolling company of the utility model and thermal load balance prior-warning device comprises some electric heaters, described each electric heater is made up of three groups of ribbon heaters, described three groups of ribbon heaters constitute delta connection and are powered by three-phase supply, the input and output side of described ribbon heater is connected in series a current transformer respectively, also comprise signal input module, signal processing module and execution module
Described signal input module comprises signals collecting and amplifies shaping unit, AD conversion unit, the output terminal of described current transformer connects described signals collecting and amplifies the input terminus of shaping unit, described signals collecting is connected the input terminus of described AD conversion unit with the output terminal that amplifies shaping unit
Described signal processing module comprises CPU processing unit, electric current comparing unit and Power arithmetic unit, the output terminal of described AD conversion unit connects the input terminus of described CPU processing unit, the output terminal of described CPU processing unit connects described electric current comparing unit and the unitary input terminus of Power arithmetic respectively
Described execution module comprises prewarning unit, communication unit and controller, described electric current comparing unit is connected the input terminus of described prewarning unit with the unitary output terminal of Power arithmetic, the output terminal of described prewarning unit connects the input terminus of described communication unit, and the output terminal of described communication unit connects described controller.
In this device, the signal of described signals collecting and amplification shaping unit amplifies shaping and adopts differential amplifier, three rank active filter and schmidt shaping circuits.
Because the electric leakage of stove soaking zone electric heater is moved back by the cold rolling company of the utility model and thermal load balance prior-warning device has adopted technique scheme, promptly the input and output side in each each ribbon heater of electric heater is connected in series a current transformer respectively, gather each current transformer current signal by signal input module, and to analog to digital conversion after the current signal do amplification shaping; Signal processing module is handled the current signal after analog to digital conversion, compares the electric current difference of each ribbon heater of electric heater and calculates the electric power of each ribbon heater, and above-mentioned difference is electrical leakage, and the electric power of ribbon heater can be judged the balance of thermal load; Send into execution module through the signal data that signal processing module is handled, execution module basis signal data are made leakage current and the early warning of thermal load equilibrated by prewarning unit, and import signal data into controller by communication unit, make corresponding adjustment by each electric heater that controller moves back the stove soaking zone to cold rolling company.Utilize this device can monitor cold rolling company in real time and move back in the stove soaking zone electric heating system electrical leakage of ribbon heater in each electric heater loop, judge thermal load balance in the stove according to electrical leakage, and provide ribbon heater electric leakage and the early warning of thermal load balance, guaranteed the normal operation and the steel band quality of equipment.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 is the structured flowchart of the utility model prior-warning device.
Embodiment
As shown in Figure 1, the electric leakage of stove soaking zone electric heater is moved back by the cold rolling company of the utility model and thermal load balance prior-warning device comprises some electric heaters 1, described each electric heater is made up of three groups of ribbon heaters 11, described three groups of ribbon heaters 11 constitute delta connection and are powered by three-phase supply, the input and output side of described ribbon heater 11 is connected in series a current transformer 12 respectively, also comprise signal input module 2, signal processing module 3 and execution module 4
Described signal input module 2 comprises signals collecting and amplifies shaping unit 21, AD conversion unit 22, the output terminal of described current transformer 12 connects described signals collecting and amplifies the input terminus of shaping unit 21, described signals collecting is connected the input terminus of described AD conversion unit 22 with the output terminal that amplifies shaping unit 21
Described signal processing module 3 comprises CPU processing unit 31, electric current comparing unit 32 and Power arithmetic unit 33, the output terminal of described AD conversion unit 22 connects the input terminus of described CPU processing unit 31, the output terminal of described CPU processing unit 31 connects the input terminus of described electric current comparing unit 32 and Power arithmetic unit 33 respectively
Described execution module 4 comprises prewarning unit 41, communication unit 42 and controller 43, described electric current comparing unit 32 is connected the input terminus of described prewarning unit 41 with the output terminal of Power arithmetic unit 33, the output terminal of described prewarning unit 41 connects the input terminus of described communication unit 42, and the output terminal of described communication unit 42 connects described controller 43.
In this device, the signal of above-mentioned signals collecting and amplification shaping unit 21 amplifies shaping and adopts differential amplifier, three rank active filter and schmidt shaping circuits.
Because the electric leakage of stove soaking zone electric heater is moved back by the cold rolling company of the utility model and the input and output side of thermal load balance prior-warning device in each each ribbon heater of electric heater is connected in series a current transformer respectively, gather each current transformer current signal by signal input module, and to analog to digital conversion after the current signal do amplification shaping; Signal processing module is handled the current signal after analog to digital conversion, compare the electric current difference of each ribbon heater of electric heater and calculate the electric power of each ribbon heater, when not having the electric leakage situation in the ribbon heater, the current transformer signal that is serially connected with the ribbon heater input and output side should be consistent, be electrical leakage if any difference, exist under the situation of electrical leakage, the electric power of each ribbon heater is consistent scarcely, cause thermal load unbalance, owing to the electric power and the linear proportional relation of temperature of ribbon heater, can judge the balance of thermal load in view of the above according to the electric power of ribbon heater;
In the present embodiment, at the input and output side of every each ribbon heater current transformer is installed, the current transformer output signal of input terminus is set at I
1, the current transformer output signal of output terminal is set at I
2, when then not having leaky in the ribbon heater, I
1-I
2Should be zero, then characterize during for non-zero in its value and had leakage current, 0.5% of the tropical rated current of power taking is worth by way of caution in this device, and 1.5% as the fault alarm value; When having leaky, the electric power of the ribbon heater that leaky takes place must reduce, and its electric power value is proportional to thermal power, and the electric power of establishing three groups of ribbon heaters of electric heater is respectively P
A, P
BAnd P
C, P in theory
A, P
BAnd P
CSum should be the rated output of electric heater, leaky takes place after, three groups of ribbon heater electric power sums promptly have difference with the rated output of electric heater, 0.5% of the power taking heater power ratings is worth by way of caution in this device, 1.5% as the fault alarm value.
Send into execution module through the signal data that above-mentioned signal processing module is handled, execution module basis signal data are made electric leakage and the early warning of thermal load equilibrated by prewarning unit, and import signal data into controller by communication unit, make corresponding adjustment by each electric heater that controller moves back the stove soaking zone to cold rolling company, reach balance so that stove soaking zone thermal load is moved back by cold rolling company.
Utilize this device can monitor cold rolling company in real time and move back in the stove soaking zone electric heating system electrical leakage of ribbon heater in each electrically heated loop, judge thermal load balance in the stove according to electrical leakage, and provide ribbon heater electric leakage and the early warning of thermal load balance, guaranteed the normal operation and the steel band quality of equipment.
Claims (2)
1, electric leakage of stove soaking zone electric heater and thermal load balance prior-warning device move back in a kind of cold rolling company, comprise some electric heaters, described each electric heater is made up of three groups of ribbon heaters, described three groups of ribbon heaters constitute delta connection and are powered by three-phase supply, it is characterized in that: the input and output side of described ribbon heater is connected in series a current transformer respectively, also comprise signal input module, signal processing module and execution module
Described signal input module comprises signals collecting and amplifies shaping unit, AD conversion unit, the output terminal of described current transformer connects described signals collecting and amplifies the input terminus of shaping unit, described signals collecting is connected the input terminus of described AD conversion unit with the output terminal that amplifies shaping unit
Described signal processing module comprises CPU processing unit, electric current comparing unit and Power arithmetic unit, the output terminal of described AD conversion unit connects the input terminus of described CPU processing unit, the output terminal of described CPU processing unit connects described electric current comparing unit and the unitary input terminus of Power arithmetic respectively
Described execution module comprises prewarning unit, communication unit and controller, described electric current comparing unit is connected the input terminus of described prewarning unit with the unitary output terminal of Power arithmetic, the output terminal of described prewarning unit connects the input terminus of described communication unit, and the output terminal of described communication unit connects described controller.
2, electric leakage of stove soaking zone electric heater and thermal load balance prior-warning device move back in cold rolling company according to claim 1, it is characterized in that: the signal of described signals collecting and amplification shaping unit amplifies shaping and adopts differential amplifier, three rank active filter and schmidt shaping circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201524324U CN201276587Y (en) | 2008-08-28 | 2008-08-28 | Soaking zone electric heater electrical leakage and heat load balance prewarning apparatus of cold rolling continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201524324U CN201276587Y (en) | 2008-08-28 | 2008-08-28 | Soaking zone electric heater electrical leakage and heat load balance prewarning apparatus of cold rolling continuous annealing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201276587Y true CN201276587Y (en) | 2009-07-22 |
Family
ID=40894170
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201524324U Expired - Fee Related CN201276587Y (en) | 2008-08-28 | 2008-08-28 | Soaking zone electric heater electrical leakage and heat load balance prewarning apparatus of cold rolling continuous annealing furnace |
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|---|---|
| CN (1) | CN201276587Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311884A (en) * | 2013-04-23 | 2013-09-18 | 上海良信电器股份有限公司 | Non-stick overvoltage and under-voltage protector with leakage protection function |
-
2008
- 2008-08-28 CN CNU2008201524324U patent/CN201276587Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311884A (en) * | 2013-04-23 | 2013-09-18 | 上海良信电器股份有限公司 | Non-stick overvoltage and under-voltage protector with leakage protection function |
| CN103311884B (en) * | 2013-04-23 | 2017-12-19 | 上海良信电器股份有限公司 | A kind of Self-recover overvoltage-undervoltage protector with creepage protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xu Jiazhuo Inventor after: Wang Guomin Inventor after: Gu Jianzhong Inventor after: Ding Xufeng Inventor after: Shi Yi Inventor after: Zhou Qianyong Inventor after: Wang Yongqiang Inventor before: Xu Jiazhuo Inventor before: history of Yi Inventor before: Ding Xufeng Inventor before: Wang Yongqiang |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: XU JIAZHUO; SHI YI; DING XUFENG; WANG YONGQIANG TO: XU JIAZHUO; WANG GUOMIN; SHI YI; GU JIANZHONG; DING XUFENG; ZHOU QIANYONG; WANG YONGQIANG |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100122 Address after: 335, Pu Pu Road, Shanghai, Baoshan District: 201900 Co-patentee after: Baoshan Iron & Steel Co., Ltd. Patentee after: Shanghai Baoshan Iron and steel industry testing company Address before: 335, Pu Pu Road, Shanghai, Baoshan District: 201900 Patentee before: Shanghai Baosteel Industry Inspection Corp. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090722 Termination date: 20130828 |