CN204347170U - Distribution network line fault monitoring device and real-time monitoring system - Google Patents
Distribution network line fault monitoring device and real-time monitoring system Download PDFInfo
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- CN204347170U CN204347170U CN201420713307.1U CN201420713307U CN204347170U CN 204347170 U CN204347170 U CN 204347170U CN 201420713307 U CN201420713307 U CN 201420713307U CN 204347170 U CN204347170 U CN 204347170U
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Abstract
The utility model discloses a kind of distribution network line fault monitoring device and real-time monitoring system, terminal comprises several zero sequence current mutual inductors, selective grounding protection device, communicating circuit, power supply transtation mission circuit, power supply receiving circuit on sheathed each branch line; Power supply transtation mission circuit and the wireless connections of power supply receiving circuit; power supply receiving circuit is electrically connected with selective grounding protection device and communicating circuit respectively; several zero sequence current mutual inductors are connected to selective grounding protection device respectively, and selective grounding protection device is connected to communicating circuit.Owing to wirelessly sending power supply energy; selective grounding protection device, communicating circuit, power supply receiving circuit can be sealed completely; the sealing property of this part circuit is fine; add the safety and reliability of monitoring terminal; and any one in the circuit of powered battery part and monitoring part goes wrong; directly can change, save material.
Description
Technical field
The utility model relates to power domain, more particularly, relates to a kind of distribution network line fault monitoring device and comprises the distribution network line earth fault real-time monitoring system of this distribution network line fault monitoring device.
Background technology
In electric system, isolated neutral or through the system of arc suppression coil, resistance eutral grounding small current neutral grounding system, most domestic 66kV and following electrical network all adopt this earthing mode.In small current neutral grounding system, modal fault is single-phase earthing, when system generation singlephase earth fault, because fault signature is not obvious, zero-sequence current is less and have very large dispersiveness, ground path is selected to have certain difficulty, if have arc suppression coil in system, difficulty is then larger.
10kV power distribution network is directly in the face of electricity consumption user, so line construction is complicated, lines branch is many, if carry out manual detection, waste time and energy, therefore monitoring device is utilized can to detect in real time the Grounding of circuit, in prior art, the method of the earth fault of 10kV power distribution network being carried out to real time on-line monitoring is: on each bus, arrange a monitoring terminal, this monitoring terminal can obtain the zero-sequence current data of the branch line in this bus, and judged whether that earth fault appears in branch road after it is analyzed, then result of determination is sent to the master controller on backstage.
But because distribution network line is huge, and if monitoring terminal is exposed to outer meeting is subject to the impacts such as thunder and lightning wind and rain, so whole monitoring terminal must be packaged together to avoid being damaged by natural force, in order to resist rugged environment, higher to the requirement of encapsulation.Existing monitoring terminal passes through built-in power, hardwired for power is carried out by interface and wire, because monitoring terminal needs continuous work, so power consumption is also very fast, if so whole monitoring terminal is packaged together, when changing battery, need to touch monitoring terminal, cumbersome, and monitoring terminal installs and had better not seal off frequently.And if the mode of employing electric power incoming line is powered, then also easily there is same problem in electric power incoming line mouth, causes the safety and reliability of monitoring terminal to reduce.
Therefore, prior art existing defects, needs to improve.
Utility model content
The technical problems to be solved in the utility model is, the defect of the safety and reliability of the reduction monitoring terminal brought for above-mentioned wired power supply of prior art, provide a kind of 10kV power distribution network, utilize the distribution network line fault monitoring device that wireless mode carries out powering and the real-time monitoring system comprising this distribution network line fault monitoring device.
The utility model solves the technical scheme that its technical matters adopts: construct a kind of distribution network line fault monitoring device, for carrying out ground fault detection to the 10Kv distribution network system comprising at least one group of bus, often organize bus and comprise some branch lines, described monitoring device comprises several on each branch line of being set in one group of bus for detecting the zero sequence current mutual inductor of the zero-sequence current real component on branch line, for determining the selective grounding protection device of earth fault line according to the described zero-sequence current of branch line, for faulty line information being mail to the communicating circuit of backstage master controller, for wirelessly sending the power supply transtation mission circuit of power supply energy, and for receive and to the power supply receiving circuit that described selective grounding protection device and communicating circuit are powered after changing described power supply energy,
Described power supply transtation mission circuit and the wireless connections of power supply receiving circuit; described power supply receiving circuit is electrically connected with described selective grounding protection device and communicating circuit respectively; several zero sequence current mutual inductors are connected to described selective grounding protection device respectively, and described selective grounding protection device is connected to communicating circuit.
Distribution network line fault monitoring device described in the utility model, wherein, described power supply transtation mission circuit comprises: power supply, governor circuit, under the control of described governor circuit by the energy conversion of described power supply be the wave of oscillation power conversion circuits, be used for the amplifying circuit that amplified by the described wave of oscillation and be used for the radiating circuit that sent in the mode of radio magnetic wave by the described wave of oscillation amplified;
Described governor circuit, power conversion circuits, amplifying circuit, radiating circuit are connected successively, and described power supply is connected to described governor circuit, power conversion circuits, amplifying circuit respectively.
Distribution network line fault monitoring device described in the utility model, wherein, described radiating circuit comprises the first inductance parallel with one another and the first electric capacity, and described power supply receiving circuit comprises the second inductance parallel with one another and the second electric capacity.
Distribution network line fault monitoring device described in the utility model, wherein, described power conversion circuits comprises integrated Sheffer stroke gate, the first resistance, the second resistance and the 3rd electric capacity, and described integrated Sheffer stroke gate inside is integrated with the first Sheffer stroke gate, the second Sheffer stroke gate, the 3rd Sheffer stroke gate
An input end of described first Sheffer stroke gate is connected to one end of described first resistance and one end of the 3rd electric capacity respectively, the other end of described first resistance is connected to the output terminal of described first Sheffer stroke gate and an input end of the second Sheffer stroke gate respectively, another input end of described second Sheffer stroke gate and another input end of described first Sheffer stroke gate are all connected to the positive pole of described power supply, the other end of described 3rd electric capacity is connected to the output terminal of described second Sheffer stroke gate, the output terminal of described second Sheffer stroke gate is connected to an input end of the 3rd Sheffer stroke gate, another input end of described 3rd Sheffer stroke gate is connected to described governor circuit by described second resistance, the output terminal of described 3rd Sheffer stroke gate is connected to described amplifying circuit.
Distribution network line fault monitoring device described in the utility model, wherein, described power conversion circuits comprises electromagnetic conversion device.
Distribution network line fault monitoring device described in the utility model, wherein, described amplifying circuit comprises the first triode, the second triode of NPN type, the 3rd triode of positive-negative-positive, the 4th triode of NPN type, the 3rd resistance, the 4th resistance of NPN type;
The collector of described first triode is connected to the positive pole of described power supply by described 4th resistance, the base stage of described first triode is connected to the output terminal of described power conversion circuits, the base stage of described first triode is also connected to the positive pole of described power supply by described 3rd resistance, the grounded emitter of described first triode, the base stage of described second triode and the base stage of described 3rd triode are all connected to the collector of described first triode, the collector of described second triode is connected to the positive pole of power supply, the grounded collector of the 3rd triode, the emitter of described second triode and the emitter of the 3rd triode are all connected to the base stage of the 4th triode, the grounded emitter of described 4th triode, the collector of described 4th triode is connected to described radiating circuit.
Distribution network line fault monitoring device described in the utility model, wherein, the model of described selective grounding protection device is TN-GLZ-1.
Distribution network line fault monitoring device described in the utility model; wherein, described communicating circuit comprises the microcontroller that the model be connected with described selective grounding protection device is PIC16F877 and the model be connected with described microcontroller is the wireless transceiver chip of nRF24L0.
The invention also discloses a kind of distribution network line earth fault real-time monitoring system, comprise the distribution network line fault monitoring device as above be arranged on every root bus.
Implement distribution network line fault monitoring device of the present utility model and real-time monitoring system; there is following beneficial effect: distribution network line fault monitoring device of the present utility model comprises power supply transtation mission circuit; it wirelessly sends power supply energy, and power supply receiving circuit can receive and power to selective grounding protection device and communicating circuit after changing described power supply energy.Therefore; selective grounding protection device, communicating circuit, power supply receiving circuit can be packaged together; the sealing property of this part circuit is fine; add the safety and reliability of monitoring terminal; and any one in the circuit of powered battery part and monitoring part goes wrong; directly can change, save material.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structured flowchart of the preferred embodiment of the utility model distribution network line fault monitoring device;
Fig. 2 is power supply transtation mission circuit in Fig. 1 and the circuit diagram of power supply receiving circuit;
Fig. 3 is the scheme of installation of the zero sequence current mutual inductor in the utility model distribution network line fault monitoring device.
Embodiment
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
With reference to figure 1, it is the structured flowchart of the preferred embodiment of the utility model distribution network line fault monitoring device;
Distribution network line fault monitoring device of the present utility model, for carrying out ground fault detection to the 10Kv distribution network system comprising at least one group of bus, often organize bus and comprise some branch lines, monitoring device comprises several zero sequence current mutual inductors 30, selective grounding protection device 40, communicating circuit 50, power supply transtation mission circuit 10, power supply receiving circuit 20 on each branch line of being set in bus;
Described power supply transtation mission circuit 10 and the wireless connections of power supply receiving circuit 20; described power supply receiving circuit 20 is electrically connected with described selective grounding protection device 40 and communicating circuit 50 respectively; several zero sequence current mutual inductors 30 are connected to described selective grounding protection device 40 respectively, and described selective grounding protection device 40 is connected to communicating circuit 50.
Zero sequence current mutual inductor 30, for detecting the zero-sequence current real component on branch line; Selective grounding protection device 40; earth fault line is determined for the described zero-sequence current according to all branch lines; be specially: after certain physical quantity compensates; carry out each line current voltage waveform and form a point quantitative analysis; judge ground path; after the waveform of each circuit zero sequence current/voltage after compensating decomposes according to certain rules, the difference highly significant of ungrounded circuit and ground path, can pick out ground path easily.
Communicating circuit 50, for mailing to backstage master controller by faulty line information; Power supply transtation mission circuit 10 is for wirelessly sending power supply energy; Power supply receiving circuit 20 is for receiving and powering to selective grounding protection device 40 and communicating circuit 50 after changing described power supply energy.
Wherein, communicating circuit 50 can be that wireless transceiver chip realizes; such as, in preferred embodiment, described communicating circuit 50 comprises the microcontroller that the model be connected with described selective grounding protection device 40 is PIC16F877 and the model be connected with described microcontroller is the wireless transceiver chip of nRF24L0.If monitoring system adopts several monitoring devices to superpose networking mode and transmits data, then communicating circuit 50 can also be selected to realize with Bluetooth chip.Zero sequence current mutual inductor 30, selective grounding protection device 40, communicating circuit 50 are prior art, repeat no more herein.
The installation of zero sequence current mutual inductor 30 and selective grounding protection device 40, can reference diagram 3.The model of described selective grounding protection device 40 is TN-GLZ-1.Such as, if certain bus is connected with 3 branch lines: branch line 1, branch line 2 and branch line 3.During installation, after ground wire has to pass through zero sequence current mutual inductor 30, branch line side ground connection.During test, test lead just should be worn through during zero sequence current mutual inductor 30, as in figure, worn to line side by bus bar side.Circuit in same section of bus both can disposable test, also can successive test, was disposable test shown in figure.
Because power supply transtation mission circuit 10 and power supply receiving circuit 20 between be wirelessly power, so can by power supply transtation mission circuit 10 encapsulate separately, and selective grounding protection device 40, communicating circuit 50, power supply receiving circuit 20 be packaged together.Like this when the follow-up battery of replacing frequently, do not need to seal off this partial circuit, the circuit relevant to data acquisition can seal completely, add the safety and reliability of monitoring terminal, and any one in the circuit of powered battery part and monitoring part goes wrong, directly can change, save material.
In preferred embodiment, described power supply transtation mission circuit 10 comprises: power supply 11, governor circuit 12, power conversion circuits 13, amplifying circuit 14 and radiating circuit 15;
Described governor circuit 12, power conversion circuits 13, amplifying circuit 14, radiating circuit 15 are connected successively, and described power supply 11 is connected to described governor circuit 12, power conversion circuits 13, amplifying circuit 14 respectively.
Power conversion circuits 13 for being the wave of oscillation by the energy conversion of described power supply 11 under the control of described governor circuit 12; Amplifying circuit 14 is for carrying out amplification process further by the described wave of oscillation; Radiating circuit 15 is for sending the described wave of oscillation amplified through amplifying circuit 14 in the mode of radio magnetic wave.
Wherein, power conversion circuits 13 directly can adopt the electromagnetic conversion device can bought on the market, also can directly utilize magnetoelectricity reforming unit to realize with power supply receiving circuit 20.
With reference to figure 2, it is power supply transtation mission circuit in Fig. 1 and the circuit diagram of power supply receiving circuit;
Governor circuit 12 can adopt single-chip microcomputer or microprocessor, and described radiating circuit 15 comprises the first inductance L 1 and the first electric capacity C1 parallel with one another, and described power supply receiving circuit 20 comprises the second inductance L 2 and the second electric capacity C2 parallel with one another.
Described power conversion circuits 13 comprises integrated Sheffer stroke gate U1, the first resistance R1, the second resistance R2 and the 3rd electric capacity C3.Described amplifying circuit 14 comprises the first triode Q1 of NPN type, the second triode Q2 of NPN type, the 3rd triode Q3 of positive-negative-positive, the 4th triode Q4 of NPN type, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8.
Described integrated Sheffer stroke gate U1 inside is integrated with the first Sheffer stroke gate, the second Sheffer stroke gate, the 3rd Sheffer stroke gate, and in the present embodiment, the model of integrated Sheffer stroke gate U1 is 74HC00, is integrated with 4 Sheffer stroke gates in it.74HC00 is a high-speed cmos device, and the reaction of this chip is fast, and output waveform is stablized.74HC00 and R1, C1 form oscillator, and the wave of oscillation signal of output is square wave, and the pulsed frequency of square wave is: f=1/ (1.4RC).Wherein R is effective resistance of resistance R1, changes the resistance R1 of different resistance, and pulsed frequency can be made adjustable to MHz level in KHz level.Single-chip microcomputer or microprocessor export the input of PWM ripple as a Sheffer stroke gate, to control the transmission frequency of square wave.
An input end (pin 12) of described first Sheffer stroke gate is connected to one end of described first resistance R1 and one end of the 3rd electric capacity C3 respectively, the other end of described first resistance R1 is connected to the output terminal (pin 11) of described first Sheffer stroke gate and an input end (pin 2) of the second Sheffer stroke gate respectively, another input end (pin 1) of described second Sheffer stroke gate and another input end (pin 13) of described first Sheffer stroke gate, the power end (pin 14) of integrated Sheffer stroke gate U1 is all connected to the positive pole of described power supply 11, the earth terminal (pin 7) of integrated Sheffer stroke gate U1 is connected to the negative pole of described power supply 11, the other end of described 3rd electric capacity C3 is connected to the output terminal (pin 3) of described second Sheffer stroke gate, the output terminal of described second Sheffer stroke gate is connected to an input end (pin 4) of the 3rd Sheffer stroke gate, another input end (pin 5) of described 3rd Sheffer stroke gate is connected to described governor circuit 12 to receive pwm signal by described second resistance R2, the output terminal (pin 6) of described 3rd Sheffer stroke gate is connected to the base stage of the first triode Q1, the base stage of the first triode Q1 is also connected to the positive pole of described power supply 11 by described 3rd resistance R3, the collector of described first triode Q1 is connected to the positive pole of described power supply 11 by described 4th resistance R4, the grounded emitter of described first triode Q1, the base stage of described second triode Q2 is connected to the collector of described first triode Q1 by the 5th resistance R5, the base stage of described 3rd triode Q3 is connected to the collector of described first triode Q1 by the 6th resistance R6, the collector of described second triode Q2 is connected to the positive pole of power supply 11, the grounded collector of the 3rd triode Q3, the emitter of described second triode Q2 is connected with the emitter of the 3rd triode Q3, and the base stage of the 4th triode Q4 is connected to by the 7th resistance R7, the base stage of the 4th triode Q4 is also by the 8th resistance R8 ground connection, the grounded emitter of described 4th triode Q4, the collector of described 4th triode Q4 is connected to the positive pole of power supply 11 by described first inductance L 1.
The square wave driving force exported due to No. 6 pins of U1 is little, and the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4 can amplify, and improves the driving force of signal.Square wave is high-frequency signal, and the 4th triode Q4 is actuated to make the first inductance L 1 and the first electric capacity C1 realize LC resonance as switch, and generate electromagnetic waves, the second inductance L 2 and the second electric capacity C2 can receive this electromagnetic wave and be converted to electric energy.
The invention also discloses a kind of distribution network line earth fault real-time monitoring system, it comprises the distribution network line fault monitoring device as above be arranged on every root bus.
In sum; distribution network line fault monitoring device of the present utility model and real-time monitoring system have following beneficial effect: distribution network line fault monitoring device of the present utility model comprises power supply transtation mission circuit; it wirelessly sends power supply energy, and power supply receiving circuit can receive and to the power supply receiving circuit that selective grounding protection device and communicating circuit are powered after changing described power supply energy.Therefore; selective grounding protection device, communicating circuit, power supply receiving circuit can be packaged together; the sealing property of this part circuit is fine; add the safety and reliability of monitoring terminal; and any one in the circuit of powered battery part and monitoring part goes wrong; directly can change, save material.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (9)
1. a distribution network line fault monitoring device, for carrying out ground fault detection to the 10Kv distribution network system comprising at least one group of bus, often organize bus and comprise some branch lines, it is characterized in that, described monitoring device comprises several on each branch line of being set in one group of bus for detecting the zero sequence current mutual inductor (30) of the zero-sequence current real component on branch line, for determining the selective grounding protection device (40) of earth fault line according to the described zero-sequence current of branch line, for faulty line information being mail to the communicating circuit (50) of backstage master controller, for wirelessly sending the power supply transtation mission circuit (10) of power supply energy, and for receive and to the power supply receiving circuit (20) that described selective grounding protection device (40) and communicating circuit (50) are powered after changing described power supply energy,
Described power supply transtation mission circuit (10) and power supply receiving circuit (20) wireless connections; described power supply receiving circuit (20) is electrically connected with described selective grounding protection device (40) and communicating circuit (50) respectively; several zero sequence current mutual inductors (30) are connected to described selective grounding protection device (40) respectively, and described selective grounding protection device (40) is connected to communicating circuit (50).
2. distribution network line fault monitoring device according to claim 1, it is characterized in that, described power supply transtation mission circuit (10) comprising: power supply (11), governor circuit (12), under the control of described governor circuit (12) by the energy conversion of described power supply (11) be the wave of oscillation power conversion circuits (13), for amplifying circuit (14) that the described wave of oscillation is amplified and the radiating circuit (15) for the described wave of oscillation amplified is sent in the mode of radio magnetic wave;
Described governor circuit (12), power conversion circuits (13), amplifying circuit (14), radiating circuit (15) are connected successively, and described power supply (11) is connected to described governor circuit (12), power conversion circuits (13), amplifying circuit (14) respectively.
3. distribution network line fault monitoring device according to claim 2, it is characterized in that, described radiating circuit (15) comprises the first inductance (L1) parallel with one another and the first electric capacity (C1), and described power supply receiving circuit (20) comprises the second inductance (L2) parallel with one another and the second electric capacity (C2).
4. distribution network line fault monitoring device according to claim 2, it is characterized in that, described power conversion circuits (13) comprises integrated Sheffer stroke gate (U1), the first resistance (R1), the second resistance (R2) and the 3rd electric capacity (C3), described integrated Sheffer stroke gate (U1) inside is integrated with the first Sheffer stroke gate, the second Sheffer stroke gate, the 3rd Sheffer stroke gate
An input end of described first Sheffer stroke gate is connected to one end of described first resistance (R1) and one end of the 3rd electric capacity (C3) respectively, the other end of described first resistance (R1) is connected to the output terminal of described first Sheffer stroke gate and an input end of the second Sheffer stroke gate respectively, another input end of described second Sheffer stroke gate and another input end of described first Sheffer stroke gate are all connected to the positive pole of described power supply (11), the other end of described 3rd electric capacity (C3) is connected to the output terminal of described second Sheffer stroke gate, the output terminal of described second Sheffer stroke gate is connected to an input end of the 3rd Sheffer stroke gate, another input end of described 3rd Sheffer stroke gate is connected to described governor circuit (12) by described second resistance (R2), the output terminal of described 3rd Sheffer stroke gate is connected to described amplifying circuit (14).
5. distribution network line fault monitoring device according to claim 2, is characterized in that, described power conversion circuits (13) comprises electromagnetic conversion device.
6. distribution network line fault monitoring device according to claim 2, it is characterized in that, described amplifying circuit (14) comprises the first triode (Q1), second triode (Q2) of NPN type, the 3rd triode (Q3) of positive-negative-positive, the 4th triode (Q4) of NPN type, the 3rd resistance (R3), the 4th resistance (R4) of NPN type;
The collector of described first triode (Q1) is connected to the positive pole of described power supply (11) by described 4th resistance (R4), the base stage of described first triode (Q1) is connected to the output terminal of described power conversion circuits (13), the base stage of described first triode (Q1) is also connected to the positive pole of described power supply (11) by described 3rd resistance (R3), the grounded emitter of described first triode (Q1), the base stage of described second triode (Q2) and the base stage of described 3rd triode (Q3) are all connected to the collector of described first triode (Q1), the collector of described second triode (Q2) is connected to the positive pole of power supply (11), the grounded collector of the 3rd triode (Q3), the emitter of described second triode (Q2) and the emitter of the 3rd triode (Q3) are all connected to the base stage of the 4th triode (Q4), the grounded emitter of described 4th triode (Q4), the collector of described 4th triode (Q4) is connected to described radiating circuit (15).
7. distribution network line fault monitoring device according to claim 1, is characterized in that, the model of described selective grounding protection device (40) is TN-GLZ-1.
8. distribution network line fault monitoring device according to claim 1; it is characterized in that, described communicating circuit (50) comprises the microcontroller that the model be connected with described selective grounding protection device (40) is PIC16F877 and the model be connected with described microcontroller is the wireless transceiver chip of nRF24L0.
9. a distribution network line earth fault real-time monitoring system, is characterized in that, comprises the distribution network line fault monitoring device as described in any one of claim 1-8 be arranged on every root bus.
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| CN201420713307.1U CN204347170U (en) | 2014-11-24 | 2014-11-24 | Distribution network line fault monitoring device and real-time monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105159378A (en) * | 2015-08-06 | 2015-12-16 | 保定上为电气科技有限公司 | Fault line selection auxiliary signal control system and control method for same |
| CN108279360A (en) * | 2018-03-29 | 2018-07-13 | 山东钢铁股份有限公司 | Singlephase earth fault circuit monitoring system |
| CN110829576A (en) * | 2019-11-06 | 2020-02-21 | 漳州科华技术有限责任公司 | Uninterruptible power supply input abnormity detection method and system and terminal equipment |
-
2014
- 2014-11-24 CN CN201420713307.1U patent/CN204347170U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105159378A (en) * | 2015-08-06 | 2015-12-16 | 保定上为电气科技有限公司 | Fault line selection auxiliary signal control system and control method for same |
| CN108279360A (en) * | 2018-03-29 | 2018-07-13 | 山东钢铁股份有限公司 | Singlephase earth fault circuit monitoring system |
| CN110829576A (en) * | 2019-11-06 | 2020-02-21 | 漳州科华技术有限责任公司 | Uninterruptible power supply input abnormity detection method and system and terminal equipment |
| CN110829576B (en) * | 2019-11-06 | 2021-04-09 | 漳州科华技术有限责任公司 | Uninterruptible power supply input abnormity detection method and system and terminal equipment |
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