CN202854224U - Transformer-cutting-off no-load overvoltage on-line monitoring system used for finery transformer in steel plant - Google Patents
Transformer-cutting-off no-load overvoltage on-line monitoring system used for finery transformer in steel plant Download PDFInfo
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- CN202854224U CN202854224U CN 201220546923 CN201220546923U CN202854224U CN 202854224 U CN202854224 U CN 202854224U CN 201220546923 CN201220546923 CN 201220546923 CN 201220546923 U CN201220546923 U CN 201220546923U CN 202854224 U CN202854224 U CN 202854224U
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- superpotential
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- monitoring system
- line monitoring
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Abstract
The utility model relates to a transformer-cutting-off no-load overvoltage on-line monitoring system used for a finery transformer in a steel plant, comprising a primary side capacitor voltage divider connected with the primary side of a transformer, a secondary side voltage divider connected with the secondary side of the transformer, an industrial control computer and an alarm device, wherein the capacitor voltage divider transits the overvoltage of the primary side of the transformer to be detected to the industrial control computer, the secondary side voltage divider transits the overvoltage of the secondary side of the transformer to be detected, and if the monitored overvoltage signal exceeds a threshold, the control alarm device gives an alarm signal. Transformer-cutting-off no-load overvoltage on-line monitoring system used for a finery transformer in a steel plant can detect the overvoltage of the transformer to be detected, also can display the detected overvoltage in real time, and gives an alarm signal according to a preset value.
Description
Technical field
The utility model relates to superpotential detection, refers to particularly a kind ofly cut space-variant superpotential on-line monitoring system for steel mill's refining furnace transformer.
Background technology
Steel mill's refining furnace transformer is the very important electrical equipment of steel mill, and its side line voltage is 35kV, and secondary side line voltage is 380V, and capacity is 28MW, and the no-load current peak value is 4-5A.Its winding connection method is Y-d11.When the vacuum isolating switch at the no-load current peak value time, the excision transformer may produce the very high superpotential of amplitude, this will cause the accidents such as the blast of transformer overvoltage protection device, Transformer Winding insulation damages.
Because transformer will carry out the switching operation every day continually, and superpotential size has randomness and uncertainty, causes easily potential safety hazard.Therefore be necessary to study a kind of system of can the Real-Time Monitoring transformer cutting space-variant superpotential size.
Summary of the invention
The utility model purpose is to overcome above-mentioned the deficiencies in the prior art and provides a kind of cuts space-variant superpotential on-line monitoring system for steel mill's refining furnace transformer, this monitoring system can detect superpotential in real time, the superpotential that detects can also be shown in real time, and give the alarm according to the overvoltage value of setting.
Realize that the technical scheme that the utility model purpose adopts is: a kind of space-variant superpotential on-line monitoring system of cutting for steel mill's refining furnace transformer comprises:
Capacitive divider is connected to the primary side of transformer, cuts the space-variant superpotential for detection of the transformer primary side;
The secondary side voltage divider is connected to the secondary side of described transformer, cuts the space-variant superpotential for detection of Circuit Fault on Secondary Transformer;
Industrial computer comprises the first data collecting card and the second data collecting card, and described the first data collecting card is connected with described capacitive divider, and described the second data collecting card is connected with the second divided voltage device; And
Warning device is connected with described industrial computer.
Further, this monitoring system also comprises:
The second divided voltage device is connected with described capacitive divider; And
The first impedance isolation resistance, its input end is connected with the voltage output end of described second divided voltage device, and output terminal is connected with described the first data collecting card.
In technique scheme, described capacitive divider is formed by a plurality of capacitances in series.
Further, described capacitive divider is formed by a plurality of capacitances in series.
Further, the step-down end of described capacitive divider is connected with voltage transformer (VT), and the low pressure outgoing side of described voltage transformer (VT) is connected with described second divided voltage device.
Further, the low pressure outgoing side of described voltage transformer (VT) is parallel with electric capacity.
Further, this monitoring system also comprises:
The second impedance isolation resistance, its input end is connected with the voltage output end of described secondary side voltage divider, and output terminal is connected with described the second data collecting card.
In technique scheme, described the first impedance isolation resistance and the second impedance isolation resistance are voltage follower.
Further, the utility model also comprises warning device, and this warning device also comprises:
Single-chip microcomputer is connected with described industrial computer, is used for output drive signal;
Triode, its base stage is connected with described single-chip microcomputer;
Relay, its control circuit is connected with the emitter of described triode;
Power supply; And
Warning lamp, its normally opened contact with described power supply and relay is connected.
Further, described warning device also comprises:
Diode, its control circuit with described relay is in parallel; And
Protective resistance, it is connected between the base stage of described single-chip microcomputer and triode.
The utility model detects the superpotential that transformer is once surveyed by capacitive divider, and the voltage signal that detects is transferred to the first data collecting card in the industrial computer after by second divided voltage device, the first impedance isolation resistance; And detect the superpotential that transformer secondary is surveyed by voltage divider, and the overvoltage signal that detects is transferred to the second data collecting card in the industrial computer after by the second impedance isolation resistance.Data collecting card is processed the overvoltage signal that gathers, if the overvoltage signal that receives surpasses the thresholding system of data collecting card, then controls warning device and gives the alarm.
In addition, the industry control function shows the superpotential information of monitoring in real time, can also analyze the overvoltage signal that gathers, and produces superpotential reason thereby draw.
Description of drawings
Fig. 1 is the structured flowchart of cutting space-variant superpotential on-line monitoring system that the utility model is used for steel mill's refining furnace transformer;
Fig. 2 is the circuit structure diagram of capacitive divider among Fig. 1;
Fig. 3 is the circuit structure diagram of second divided voltage device among Fig. 1;
Fig. 4 is the circuit diagram of the first impedance buffer circuit and the second impedance isolation among Fig. 1;
Fig. 5 is the structural representation of warning device among Fig. 1.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the space-variant superpotential on-line monitoring system of cutting that is used for steel mill's refining furnace transformer comprises: the secondary side that the primary side that is connected to transformer 100 primary sides cuts space-variant superpotential pick-up unit 200, be connected to transformer 100 secondary sides is cut space-variant superpotential pick-up unit 300, industrial computer 400, the data collecting card that is built in industrial computer 400 and warning device 500, use two data capture cards, i.e. the first data collecting card 401 and the second data collecting card 402 in the present embodiment.
Wherein, primary side is cut space-variant superpotential pick-up unit 200 and is comprised capacitive divider 201, second divided voltage device 202 and the first impedance buffer circuit 203.Superpotential when wherein capacitive divider 201 is installed in the excision no-load transformer that is used for the measuring transformer primary side between isolating switch and the transformer 100, capacitive divider 201 send the first data collecting card 401 to after the overvoltage signal that gathers is passed through second divided voltage device 202 and the first impedance buffer circuit 203.
Above-mentioned capacitive divider 201 is formed by a plurality of capacitances in series, present embodiment take intrinsic standoff ratio as
Two series capacitances be that example describes, as shown in Figure 2, after two capacitances in series, the one termination is measured bus, other end ground connection.In order to improve measuring accuracy, at the secondary series inductance L of capacitive divider 201 and after the voltage transformer (VT) step-down, export.Be used for the exciting current of bucking voltage mutual inductor and the inductive component in the load to reduce error in voltage transformer (VT) low pressure output side joint capacitor C.The additional Secondary Winding connecting resistance R of mutual inductor is in order to prevent ferro-resonance over-voltage.
As shown in Figure 3, second divided voltage device 202 comprises capacitor C 1, C2 resistance R 1, R2 and R3, wherein capacitor C 1, C2 connect rear and resistance R 3 rear ground connection in parallel, one end of resistance R 1 is connected with signal input part, the other end is connected with signal output part, resistance R 2 one ends are connected between capacitor C 1 and the C2, and the other end is connected with signal output part.The used second divided voltage device 202 of present embodiment is the used circuit of prior art, repeats no more herein, and the intrinsic standoff ratio of this second divided voltage device 202 is 100:10.
Used secondary side voltage divider 301 is identical with the circuit structure of second divided voltage device 202 in the present embodiment, the signal input of secondary side voltage divider 301 is connected to secondary side 102, signal output sends the second data collecting card 402 to behind the second impedance buffer circuit 302, the intrinsic standoff ratio of secondary side voltage divider 301 is 220:10 in the present embodiment.
The first impedance buffer circuit 203 and the second impedance buffer circuit 302 are this area voltage follower commonly used, and as shown in Figure 4, its concrete structure repeats no more herein.Voltage follower has very high input impedance and very low output impedance, and carrying load ability is strong.Operational amplifier adopts the AD817 high-speed low-power-consumption operational amplifier of Analog Device company in the present embodiment, this amplifier has the 50MHz unity gain bandwidth, 350V/ μ S switching rate, support maximum current 7.5mA, the driving load capacity is strong, and the voltage follower that is comprised of it can satisfy the requirement of cutting the space-variant over-voltage monitoring.
Superpotential data analysis in 400 pairs of the first data collecting cards 401 of industrial computer and the second data collecting card 402, if the superpotential of measuring is higher than preset value, then industrial computer 400 sends warning message to warning device 500.
As shown in Figure 5, warning device 500 comprises single-chip microcomputer 501, protective resistance 502, triode 503, diode 504, relay 505, power supply 507 and warning lamp 508.Single-chip microcomputer 501 input ends are connected with industrial computer 400 by USB interface, are used for receiving the warning message that industrial computer 400 sends.The control signal of single-chip microcomputer 501 outputs is through after the protective resistance 502; enter the base stage of triode 503; the grounded collector of triode 503; the anodic bonding of emitter and diode 504; diode 504 is connected with the control circuit of relay 505, and diode 504 plays the effect of protective relay 505.The normally opened contact of relay 505 is connected with power supply 507 and warning lamp 508.After triode 503 receives the switching drive signal of single-chip microcomputer 501, realize the control to pilot relay 505 control circuits, thus the switch of control warning lamp 508.Conducting by single-chip microcomputer 501 control triodes 503 and closing, and the switch of triode 503 control warning lamps 508 are prior art, herein no longer one by one detailed description.
To the cutting in the work of space-variant superpotential on-line monitoring of transformer, all be connected with the utility model at transformer A, B, C three-phase and cut space-variant superpotential on-line monitoring system, to realize the online detection to transformer A, B, C three-phase.
The utility model can also be installed in Test Field with capacitive divider 201, second divided voltage device 202 is installed in the Control Room, capacitive divider 201 and second divided voltage device 202 are connected by cable, so be conducive to the monitor staff and understand in real time the on-the-spot situations of monitoring by industrial computer 400 in Control Room.
The utility model can also be analyzed the overvoltage signal of monitoring by the EMPY-ATP software that is installed on industrial computer.
Claims (9)
- One kind be used for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that, comprising:Capacitive divider is connected to the primary side of transformer, cuts the space-variant superpotential for detection of the transformer primary side;The secondary side voltage divider is connected to the secondary side of described transformer, cuts the space-variant superpotential for detection of Circuit Fault on Secondary Transformer;Industrial computer comprises the first data collecting card and the second data collecting card, and described the first data collecting card is connected with described capacitive divider, and described the second data collecting card is connected with the second divided voltage device; AndWarning device is connected with described industrial computer.
- According to claim 1 described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that, also comprise:The second divided voltage device is connected with described capacitive divider; AndThe first impedance isolation resistance, its input end is connected with the voltage output end of described second divided voltage device, and output terminal is connected with described the first data collecting card.
- According to claim 2 described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that: described capacitive divider is formed by a plurality of capacitances in series.
- 4. describedly according to claim 3 cut space-variant superpotential on-line monitoring system for steel mill's refining furnace transformer, it is characterized in that: the step-down end of described capacitive divider is connected with voltage transformer (VT), and the low pressure outgoing side of described voltage transformer (VT) is connected with described second divided voltage device.
- According to claim 4 described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that: the low pressure outgoing side of described voltage transformer (VT) is parallel with electric capacity.
- According to claim 5 described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that, also comprise:The second impedance isolation resistance, its input end is connected with the voltage output end of described secondary side voltage divider, and output terminal is connected with described the second data collecting card.
- 7. according to claim 1 ~ 6 each described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that described the first impedance isolation resistance and the second impedance isolation resistance are voltage follower.
- According to claim 7 described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that described warning device comprises:Single-chip microcomputer is connected with described industrial computer, is used for output drive signal;Triode, its base stage is connected with described single-chip microcomputer;Relay, its control circuit is connected with the emitter of described triode;Power supply; AndWarning lamp, its normally opened contact with described power supply and relay is connected.
- According to claim 8 described for steel mill's refining furnace transformer cut space-variant superpotential on-line monitoring system, it is characterized in that described warning device also comprises:Diode, its control circuit with described relay is in parallel; AndProtective resistance, it is connected between the base stage of described single-chip microcomputer and triode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220546923 CN202854224U (en) | 2012-10-24 | 2012-10-24 | Transformer-cutting-off no-load overvoltage on-line monitoring system used for finery transformer in steel plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220546923 CN202854224U (en) | 2012-10-24 | 2012-10-24 | Transformer-cutting-off no-load overvoltage on-line monitoring system used for finery transformer in steel plant |
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| CN202854224U true CN202854224U (en) | 2013-04-03 |
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| CN 201220546923 Expired - Fee Related CN202854224U (en) | 2012-10-24 | 2012-10-24 | Transformer-cutting-off no-load overvoltage on-line monitoring system used for finery transformer in steel plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092946A (en) * | 2015-09-16 | 2015-11-25 | 成都比善科技开发有限公司 | Three-phase circuit overvoltage monitoring system |
| CN112867928A (en) * | 2018-07-17 | 2021-05-28 | 哈勃股份有限公司 | Voltage collector for power distribution system device |
-
2012
- 2012-10-24 CN CN 201220546923 patent/CN202854224U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092946A (en) * | 2015-09-16 | 2015-11-25 | 成都比善科技开发有限公司 | Three-phase circuit overvoltage monitoring system |
| CN112867928A (en) * | 2018-07-17 | 2021-05-28 | 哈勃股份有限公司 | Voltage collector for power distribution system device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20171024 |
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| CF01 | Termination of patent right due to non-payment of annual fee |