CN104215825A - Comprehensive online monitoring system for power transformer - Google Patents
Comprehensive online monitoring system for power transformer Download PDFInfo
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- CN104215825A CN104215825A CN201410412642.2A CN201410412642A CN104215825A CN 104215825 A CN104215825 A CN 104215825A CN 201410412642 A CN201410412642 A CN 201410412642A CN 104215825 A CN104215825 A CN 104215825A
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Abstract
The invention discloses a comprehensive online monitoring system for a power transformer. In a transformer main loop, a high-voltage current inductor L1, a high-voltage current inductor L2 and a high-voltage current inductor L3 which are used for monitoring the input current of a high voltage end are mounted at the high voltage end, and a low-voltage current inductor L4, a low-voltage current inductor L5 and a low-voltage current inductor L6 which are used for monitoring the load current of a low voltage end are mounted at the low voltage end. A drop switch monitoring circuit, a high-voltage-side and low-voltage-side overcurrent monitoring circuit, a circuit for monitoring whether high voltage has phase loss or not and a circuit for monitoring whether low voltage has phase loss or not are further disposed in the transformer main loop. The system is further provided with a circuit for monitoring transformer overtemperature, seal cover prying and vibration. The system has the advantages that GSM, GPS or CDMA is used as medium wireless transmission signals, a terminal adopts computer display, and controlled data is recorded; the system is wide in monitoring range, complete in practical functions, and capable monitoring power off, overload, phase loss, temperature, oil pressure, antitheft, remote wireless transmission and the like of transfers in various power supply systems.
Description
Technical field
The present invention relates to electric power facility field, specifically the comprehensive on-line monitoring system of power transformer.
Background technology
Present electric power supply all be unable to do without transformer, transformer in the course of the work, there will be the faults such as all kinds of self or artificial destruction unavoidably, once there is this type of fault and fail Timeliness coverage and maintenance will to safety in production bring threaten and loss, as before above-mentioned situation occurs or simultaneously energy and alarm, so its loss will greatly alleviate or avoid completely.
Summary of the invention
Object of the present invention is exactly the defect existed for prior art, provide a kind of can the comprehensive on-line monitoring system of power transformer of before transformer fault occurs or simultaneously energy and alarm.
For achieving the above object, technical scheme of the present invention is the comprehensive on-line monitoring system of a kind of power transformer:
In transformer major loop, high-pressure side is separately installed with high-tension current inductor, and low pressure end is separately installed with low-voltage current mutual inductor;
Be provided with three road drop switch observation circuits in transformer major loop, respectively by optocoupler and diodes in parallel is in series with a resistor again forms, wherein the output terminal of optocoupler is connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit;
High and low pressure side overcurrent monitoring circuit is: in parallel after three road resistance difference series diodes, then connect electric capacity, resistance and diode, optocoupler, the output terminal of optocoupler is connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit;
High-pressure side phase shortage observation circuit is the adjacent phase observation circuits in three tunnels, and by optocoupler and diodes in parallel composition in series with a resistor again, the output terminal of optocoupler is connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit;
Low pressure end phase shortage observation circuit, connect the optocoupler of low pressure end respectively by three tunnels and diodes in parallel in series with a resistor again, be connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit respectively by the output terminal of light lotus root;
Power circuit connects into full-wave rectifying circuit by transformer and diode, rechargeable battery resistance in series composition charging circuit, and integrated regulator connects electric capacity composition mu balanced circuit;
Transformer temperature is too high, transformer oil level and pick-proof vibration monitoring circuit comprise: by adjustable resistance, thermistor and resistant series, the base stage of triode connects between thermistor and resistance, the collector of triode connects optocoupler and diode, the I/O port that the output terminal of optocoupler is connected to the single-chip microcomputer in signal transacting and transtation mission circuit forms the too high observation circuit of temperature, by resistance, adjustable resistance and shock sensor series connection, the base stage of triode connects shock sensor and resistance, the collector of triode connects optocoupler and diode, the I/O port that the output terminal of optocoupler is connected to the single-chip microcomputer in signal transacting and transtation mission circuit forms pick-proof vibration monitoring circuit, by resistance, fuel level sensor and resistant series, the base stage of triode connects fuel level sensor and resistance, the collector of triode connects optocoupler and diode, the I/O port that the output terminal of optocoupler is connected to the single-chip microcomputer in signal transacting and transtation mission circuit forms oil level observation circuit,
Signal transacting and transtation mission circuit, take single-chip microcomputer as core, comprise I/O input port, the reset circuit of capacitances in series resistance composition, crystal oscillator connects single-chip microcomputer composition clock circuit, wireless digital transmitter module is connected single-chip microcomputer with emitting antenna, integrated regulator connect electric capacity composition single-chip microcomputer mu balanced circuit;
Data receiver, storage, display and warning circuit, wireless digital receiver module is directly connected computer serial port with receiving antenna, and transformer and diode connect into full-wave rectifying circuit, and integrated regulator connects electric capacity composition mu balanced circuit.
Described wireless digital transmitting and receiving module is GPS, GSM or CDMA data transfer mode.
Beneficial effect: the present invention adopts GSM or GPS or CDMA to be medium wireless signal transmission, terminal adopts computer show and record controlled data.Have monitoring range wide in range, utility function is complete, can meet the monitoring needs such as the power-off of transformer in various electric power system, overload, phase shortage, temperature, oil pressure, antitheft and long range radio transmissions.
Accompanying drawing explanation
Fig. 1 is transformer major loop, and BL is power transformer, and B 1, B2, B3 are drop switch, and L1, L2, L3 are high-tension current inductors; L4, L5, L6 low-voltage current mutual inductor;
Fig. 2 a, 2b, 2c are the observation circuit of three drop switch B1, B2, B3 respectively;
Fig. 3 a is high-pressure side overcurrent monitoring circuit, and Fig. 3 b is low pressure end overcurrent monitoring circuit;
Fig. 4 a is A, B phase observation circuit, and Fig. 4 b is B, C phase observation circuit, and Fig. 4 c is C, A phase observation circuit;
Fig. 5 is low pressure end phase shortage observation circuit;
Fig. 6 is power circuit;
Fig. 7 is that transformer temperature is too high, transformer oil level and pick-proof vibration monitoring circuit;
Fig. 8 is signal transacting and transtation mission circuit;
Fig. 9 is data receiver, storage, display and warning circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, the present embodiment is implemented under premised on technical solution of the present invention, should understand these embodiments and only be not used in for illustration of the present invention and limit the scope of the invention.
Fig. 1 is major loop, in figure: three-phase high-voltage input electric wire A, B, C connect power transformer BL through the first drop switch B1, the second drop switch B2, the 3rd drop switch B3, A', B', C at drop switch ' side is coated with three high-tension current inductors, is respectively the first current transformer L1, the second current transformer L2, the 3rd current transformer L3; The low pressure end of power transformer BL is coated with three low-voltage current mutual inductors, is respectively the 4th current transformer L4, the 5th current transformer L5, the 6th current transformer L6, and low pressure exports as three-phase and four-line a, b, c, n, and n is zero line.
Fig. 2 is drop switch observation circuit, in figure: Fig. 2 a, 2b, 2c are the observation circuit of the first drop switch B1, the second drop switch B2 and the 3rd drop switch B3 respectively, Fig. 2 a is composed in series with the first resistance R1, the second resistance R2 by the first optocoupler G1 is in parallel with the first diode D1 again, and the output terminal 1 of the first optocoupler G1 is connected to I/O mouth 1 end of Fig. 8 single-chip microcomputer IC3; Fig. 2 b is composed in series with the 3rd resistance R3, the 4th resistance R4 by the second optocoupler G2 is in parallel with the second diode D2 again, and the output terminal 2 of the second smooth lotus root G2 is connected to I/O mouth 2 end of Fig. 8 single-chip microcomputer IC3; Fig. 2 c is composed in series with the 5th resistance R5, the 6th resistance R6 by the 3rd optocoupler G3 is in parallel with the 3rd diode D3 again, and the output terminal 3 of the 3rd optocoupler G3 is connected to I/O mouth 3 end of Fig. 8 single-chip microcomputer IC3; Terminal A, A', B, B', C, C in figure ', be connected to Fig. 1 corresponding endpoint place.
Fig. 3 is high and low pressure side overcurrent monitoring circuit, in figure: Fig. 3 a is high-pressure side overcurrent monitoring circuit, by the 7th resistance R7 series connection the 4th diode D4, the 8th resistance R8 series connection the 5th diode D5, the 9th resistance R9 series connection the 6th diode D6, the first electric capacity C1, the tenth resistance R10 is connected after the negative pole of the 4th diode D4, the 5th diode D5, the 6th diode D6 links together, adjustable resistance R11 connects the tenth resistance R10, the output terminal 4 of the 7th diode D7 parallel connection the 4th optocoupler G4, the 4th optocoupler G4 is connected to I/O mouth 4 end of Fig. 8 single-chip microcomputer IC3; Fig. 3 b is low pressure end overcurrent monitoring circuit, by the 12 resistance R12 series connection the 8th diode D8, the 13 resistance R13 series connection the 9th diode D9, the 14 resistance R14 series connection the tenth diode D10, the second electric capacity C2, the 15 resistance R15 is connected after the negative pole of the 8th diode D8, the 9th diode D9, the tenth diode D10 links together, adjustable resistance R16 connects the 15 resistance R15, the output terminal 5 of the 11 diode D11 parallel connection the 5th optocoupler G5, the 5th optocoupler G5 is connected to I/O mouth 5 end of Fig. 8 single-chip microcomputer IC3; End points T1 in figure---T8 is connected to Fig. 1 corresponding endpoint place.
Fig. 4 is high-pressure side phase shortage observation circuit, in figure: Fig. 4 a is three-phase high-voltage input electric wire A, B phase observation circuit, by the 6th optocoupler G6 in parallel with the 12 diode D12 again with the 17 resistance R17,18 resistance R18 is composed in series, and the output terminal 6 of the 6th optocoupler G6 is connected to I/O mouth 6 end of Fig. 8 single-chip microcomputer IC3; Fig. 4 b is three-phase high-voltage input electric wire B, C phase observation circuit, be composed in series with the 19 resistance R19, the 20 resistance R20 by the 7th optocoupler G7 is in parallel with the 13 diode D13, the output terminal 7 of the 7th optocoupler G7 is connected to I/O mouth 7 end of Fig. 8 single-chip microcomputer IC3 again; Fig. 4 c is three-phase high-voltage input electric wire C, A phase observation circuit, be composed in series with the 21 resistance R21, the 22 R22 by the 8th optocoupler G8 is in parallel with the 14 diode D14, the output terminal 8 of the 8th optocoupler G8 is connected to I/O mouth 8 end of Fig. 8 single-chip microcomputer IC3 again; Terminal A, B, C in figure, be connected to the corresponding breakpoint place of Fig. 1.
Fig. 5 is low pressure end phase shortage, overvoltage observation circuit, is connected with the 15 diode D15 parallel connection by the 9th optocoupler G9 with the 23 resistance R23 again, and the output terminal 9 of the 9th optocoupler G9 is connected to I/O mouth 9 end of Fig. 8 single-chip microcomputer IC3; Connected with the 24 resistance R24 with the 16 diode D16 parallel connection by the tenth optocoupler G10, the output terminal 10 of the tenth optocoupler G10 is connected to I/O mouth 10 end of Fig. 8 single-chip microcomputer IC3 again; Connected with the 25 resistance R25 with the 17 diode D17 parallel connection by the 11 smooth lotus root G11, the output terminal 11 of the 11 smooth lotus root G11 is connected to I/O mouth 11 end of Fig. 8 single-chip microcomputer IC3 again; In figure, end points a, b, c, n are connected to Fig. 1 corresponding endpoint place.
Fig. 6 is power circuit, in figure: the first transformer BY1 and the 24 diode D24, the 25 diode D25 connect into full-wave rectifying circuit, rechargeable battery DC series connection the 40 resistance R40 forms charging circuit, and the first integrated regulator IC1 (7812) connects the 3rd electric capacity C3, the 4th C4 forms mu balanced circuit.A, b two ends of the first transformer BY1 are connected to Fig. 1.
Fig. 7 is that transformer temperature is too high, transformer oil level and pick-proof vibration monitoring circuit.Connected by the 32 resistance R32, adjustable resistance R33, thermistor R34 and the 35 resistance R35, the base stage of the first triode BG1 connects thermistor R34 and the 35 resistance R35, the output terminal 15 of collector connection the 15 smooth lotus root G15 and the 21 diode D21, the 15 optocoupler G15 of the first triode BG1 is connected to the too high observation circuit of I/O mouth 15 end composition temperature of Fig. 8 single-chip microcomputer IC3; Connected by the 36 resistance R36, adjustable resistance R37 and shock sensor ZD, the base stage of the second triode BG2 connects shock sensor ZD and adjustable resistance R37, the output terminal 16 of collector connection the 16 optocoupler G16 and the 22 diode D22, the 16 optocoupler G16 of the second triode BG2 is connected to the I/O mouth 16 end composition pick-proof vibration monitoring circuit of Fig. 8 single-chip microcomputer IC3; Connected by the 38 resistance R38, fuel level sensor YW and the 39 resistance R39, the base stage of the 3rd triode BG3 connects fuel level sensor YW and the 39 resistance R39, the output terminal 17 of collector connection the 17 optocoupler G17 and the 23 diode D23, the 17 optocoupler G17 of the 3rd triode BG3 is connected to the I/O mouth 17 end composition oil level observation circuit of Fig. 8 single-chip microcomputer IC3; In circuit, Vcc is connected to Fig. 6 corresponding position.
Fig. 8 is signal transacting and transtation mission circuit, IC3 is single-chip microcomputer (89S51), 1---17 is I/O input ports, 5th electric capacity C5 series connection the 50 resistance R50 forms the reset circuit of single-chip microcomputer IC3, crystal oscillator TX connects single-chip microcomputer IC3 provides reference clock, IC4 is digital transmission module, and single-chip microcomputer IC3 connects digital transmitter module IC4; The mu balanced circuit that second integrated regulator IC2 (7805) connects the 6th electric capacity C6, the 7th electric capacity C7 forms single-chip microcomputer IC3, Vcc is connected to Fig. 6 corresponding position; TX 1 is emitting antenna.
Fig. 9 is data receiver, storage, display and warning circuit; Digital received module I C6 directly connects computer PC serial ports; Second transformer BY2 and the 27 diode D27, the 28 diode D28 connect into full-wave rectifying circuit, and the 3rd integrated regulator IC5 (7812) connects the 8th electric capacity C8, the 9th electric capacity C9 forms mu balanced circuit; TX2 is receiving antenna.M, N two ends of the first transformer BY1 connect 220V power supply.
Principle of work:
1, drop switch observation circuit principle: in composition graphs 1 and Fig. 2 a, Fig. 2 a, A, A' are connected in parallel on the first drop switch B1 two ends, and when drop switch is normal, A, A' two ends are without potential difference (PD), and the first optocoupler G1 not conducting, namely exports without negative signal; When drop switch falls damage, A, A' two ends appearance potential is poor, the first optocoupler G1 conducting, and namely negative signal exports, and in Fig. 8, single-chip microcomputer IC3 sends fault-signal; Fig. 2 b, Fig. 2 c are in like manner.
2, high, low pressure end overcurrent monitoring circuit theory: composition graphs 1 and Fig. 3 a, in figure: Fig. 3 a is high-pressure side overcurrent monitoring circuit, T1 in figure, T2, T3, first current transformer L1 of T7 connection layout 1, second current transformer L2, 3rd current transformer L3, its output current is through the 7th resistance R7, 8th resistance R8, 9th resistance R9 current limliting is through the 4th diode D4 of series connection, 5th diode D5, 6th diode D6, by the first electric capacity C1 filtering, tenth resistance R10, adjustable resistance R11 regulates setting value to send the 4th optocoupler G4 to, as the first current transformer L1, second current transformer L2, when the electric current of the 3rd current transformer L3 is normal, 4th optocoupler G4 not conducting, as electric current exceed setting value time, 4th optocoupler G4 conducting, in Fig. 8, single-chip microcomputer IC3 sends fault-signal, Fig. 3 b in like manner.
3, high-pressure side phase shortage observation circuit: composition graphs 1 and Fig. 4 a, in figure: A, B connection layout 1, monitoring A, B two-phase, its voltage is through the 17 resistance R17,18 resistance R18 current limliting, 12 diode D12 rectification sends the 6th optocoupler G6 to, and when A, B two phase voltages are normal, the 6th optocoupler G6 conducting also sends normal signal to single-chip microcomputer IC3 in Fig. 8; When A, B two-phase voltage reduces, the 6th optocoupler G6 ends and sends fault-signal to single-chip microcomputer IC3 in Fig. 8; Fig. 4 b, Fig. 4 c are in like manner.
4, low pressure end phase shortage observation circuit: composition graphs 1 and Fig. 5; In figure: a, b, c, n connection layout 1, its voltage is through the 23 resistance R23, the 24 resistance R24, the 25 resistance R25 current limliting, 15 diode D15, the 16 diode D16, the 17 diode D17 rectification also send the 9th optocoupler G9, the tenth optocoupler G10, the 11 optocoupler G1l to, respectively to monitor a, b, c three-phase voltage respectively; When a, b, c three-phase voltage is all normal, the 9th optocoupler G9, the tenth optocoupler G10, the equal conducting of the 11 optocoupler G1l send normal signal to single-chip microcomputer 1C3 in Fig. 8; When a, b, c three-phase voltage is by when wherein certain lacks mutually, its corresponding 9th optocoupler G9 or the tenth optocoupler G10 or the 11 optocoupler G11 will end and send corresponding fault-signal to single-chip microcomputer IC3 in Fig. 8;
5, power circuit, composition graphs 1 and Fig. 6, in Fig. 6: a, b connection layout 1, its voltage 380V is through the first transformer BY1 step-down, 24 diode D24, the 25 diode D25 rectification, direct current after rectification, road a 40 resistance R40 charges to rechargeable battery DC, and another road connects the 3rd electric capacity C3 via the first integrated regulator IC1 (7812), the 4th electric capacity C4 forms mu balanced circuit voltage stabilizing provides power Vcc to each circuit.When having a power failure as occurred, the energy of rechargeable battery DC provides the energy through the 26 diode D26 to circuit.
6, transformer temperature is too high, transformer oil level and pick-proof vibration monitoring circuit, composition graphs 7, in figure: temperature is too high by the 32 resistance R32, adjustable resistance R33, thermistor R34 and the 35 resistance R35 connects, base potential is provided to the first triode BG1, when temperature is lower than normal value, thermistor R34 is high impedance, first triode BG1 not conducting, the output terminal cut-off of the 15 smooth lotus root G15, when temperature excursions, thermistor R34 is Low ESR, the output terminal of the first triode BG1 conducting the 15 optocoupler G15 exports electronegative potential and I/O mouth 15 end to single-chip microcomputer IC3 in Fig. 8 transmits the too high signal of temperature, pick-proof vibration monitoring circuit, connected by the 36 resistance R36, adjustable resistance R37 and shock sensor ZD, base potential is provided to the second triode BG2, time shockproof, shock sensor ZD is Low ESR, the second triode BG2 not conducting, the output terminal cut-off of the 16 optocoupler G16, when there are vibrations, shock sensor ZD be high impedance, the output terminal of the second triode BG2 conducting the 16 optocoupler G16 output electronegative potential vibration signal appears in I/O mouth 16 end transmission to single-chip microcomputer IC3 in Fig. 8, oil level sensing circuit, connected by the 38 resistance R38, fuel level sensor YW and the 39 resistance R39, base current is provided to the 3rd triode BG3, when transformer oil surface is normal, fuel level sensor YW ends, 3rd triode BG3 not conducting, the output terminal cut-off of the 17 optocoupler G17, when there is transformer oil starvation, fuel level sensor YW conducting, triode BG3 conducting, the output terminal of the 17 optocoupler G17 exports electronegative potential and fault-signal appears in I/O mouth 17 end transmission to single-chip microcomputer IC3 in Fig. 8.
7, signal transacting and transtation mission circuit, in composition graphs 8, figure, IC3 is single-chip microcomputer (89S51), 1---and 17 is I/O input ports, 5th electric capacity C5 series connection the 50 resistance R50 forms the reset circuit of single-chip microcomputer IC3, and crystal oscillator TX connects single-chip microcomputer IC3 provides reference clock.The I/O input port 1 of single-chip microcomputer IC3---17 accept each circuit signal and send digital transmission module I C4 to, are launched by digital transmission module I C4.The mu balanced circuit that second integrated regulator IC2 (7805) connects the 6th electric capacity C6, the 7th electric capacity C7 forms single-chip microcomputer IC3, Vcc is connected to Fig. 6.
8, data receiver, storage, display and warning circuit; In composition graphs 9, figure: digital received module I C6 directly connects computer PC serial ports; Second transformer BY2 and the 27 diode D27, the 28 diode D28 connect into full-wave rectifying circuit, and the 3rd integrated regulator IC5 (7812) connects the 8th electric capacity C8, the 9th electric capacity C9 forms mu balanced circuit provides power supply to digital received module I C6.M, N two ends of the first transformer BY1 connect 220V power supply.
Claims (2)
1. the comprehensive on-line monitoring system of power transformer, is characterized in that:
In transformer major loop, high-pressure side is separately installed with high-tension current inductor, and low pressure end is separately installed with low-voltage current mutual inductor;
Be provided with three road drop switch observation circuits in transformer major loop, respectively by optocoupler and diodes in parallel is in series with a resistor again forms, wherein the output terminal of optocoupler is connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit;
High and low pressure side overcurrent monitoring circuit is: in parallel after three road resistance difference series diodes, then connect electric capacity, resistance and diode, optocoupler, the output terminal of optocoupler is connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit;
High-pressure side phase shortage observation circuit is the adjacent phase observation circuits in three tunnels, and by optocoupler and diodes in parallel composition in series with a resistor again, the output terminal of optocoupler is connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit;
Low pressure end phase shortage observation circuit, connect the optocoupler of low pressure end respectively by three tunnels and diodes in parallel in series with a resistor again, be connected to the I/O port of the single-chip microcomputer in signal transacting and transtation mission circuit respectively by the output terminal of light lotus root;
Power circuit connects into full-wave rectifying circuit by transformer and diode, rechargeable battery resistance in series composition charging circuit, and integrated regulator connects electric capacity composition mu balanced circuit;
Transformer temperature is too high, transformer oil level and pick-proof vibration monitoring circuit comprise: by adjustable resistance, thermistor and resistant series, the base stage of triode connects between thermistor and resistance, the collector of triode connects optocoupler and diode, the I/O port that the output terminal of optocoupler is connected to the single-chip microcomputer in signal transacting and transtation mission circuit forms the too high observation circuit of temperature, by resistance, adjustable resistance and shock sensor series connection, the base stage of triode connects shock sensor and resistance, the collector of triode connects optocoupler and diode, the I/O port that the output terminal of optocoupler is connected to the single-chip microcomputer in signal transacting and transtation mission circuit forms pick-proof vibration monitoring circuit, by resistance, fuel level sensor and resistant series, the base stage of triode connects fuel level sensor and resistance, the collector of triode connects optocoupler and diode, the I/O port that the output terminal of optocoupler is connected to the single-chip microcomputer in signal transacting and transtation mission circuit forms oil level observation circuit,
Signal transacting and transtation mission circuit, take single-chip microcomputer as core, comprise I/O input port, the reset circuit of capacitances in series resistance composition, crystal oscillator connects single-chip microcomputer composition clock circuit, wireless digital transmitter module is connected single-chip microcomputer with emitting antenna, integrated regulator connect electric capacity composition single-chip microcomputer mu balanced circuit;
Data receiver, storage, display and warning circuit, wireless digital receiver module is directly connected computer serial port with receiving antenna, and transformer and diode connect into full-wave rectifying circuit, and integrated regulator connects electric capacity composition mu balanced circuit.
2. the comprehensive on-line monitoring system of a kind of power transformer according to claim 1, is characterized in that: described wireless digital transmitting and receiving module is GPS, GSM or CDMA data transfer mode.
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| CN105185552A (en) * | 2015-09-22 | 2015-12-23 | 波瑞电气有限公司 | Code division multiple access (CDMA) communication-based transformer |
| CN106023539A (en) * | 2016-06-24 | 2016-10-12 | 国网山东省电力公司寿光市供电公司 | Power transformer running state alarm device |
| CN106872167A (en) * | 2015-12-14 | 2017-06-20 | 天津益华微电子有限公司 | A kind of unmanned plane observation circuit |
| CN108700627A (en) * | 2016-02-18 | 2018-10-23 | Abb瑞士股份有限公司 | Method and system for measuring the power attenuation in power transformer |
| CN111080179A (en) * | 2020-02-04 | 2020-04-28 | 深圳市霍克威尔科技有限公司 | Transformer state risk assessment system, method and computer readable storage medium |
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Application publication date: 20141217 |