CN105044571A - Distribution cable comprehensive condition online monitoring system and method with self-powered function - Google Patents
Distribution cable comprehensive condition online monitoring system and method with self-powered function Download PDFInfo
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- CN105044571A CN105044571A CN201510405505.0A CN201510405505A CN105044571A CN 105044571 A CN105044571 A CN 105044571A CN 201510405505 A CN201510405505 A CN 201510405505A CN 105044571 A CN105044571 A CN 105044571A
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Abstract
The invention provides a distribution cable comprehensive condition online monitoring system and method with a self-powered function. The system comprises a split iron core unit, so that the problem of recovering energy from a three-core distribution cable is solved innovatively. The system comprises a temperature and high frequency current sensing unit which monitors the comprehensive conditions of a heat condition and an electricity condition of a cable at the same time, and an embedded host system which achieves minimization of system energy consumption with low energy consumption and which has an intelligent assessment unit for performing real-time calculation of cable core temperature. The system made of the abovementioned hardware and software function units is characterized by being economic to manufacture, convenient to install, safe to use and easy to maintain, and achieves the distribution cable comprehensive condition online monitoring with the self-powered function. The monitoring system serves as a tool advanced in technology, and is suitable for being applied to power companies for distribution operation and maintenance.
Description
[technical field]
The present invention relates to power equipment state monitoring, asset management and Safety Supervision field, be specifically related to a kind of distribution cable comprehensive state on-line monitoring system and the method with self-powered ability.
[background technology]
Distribution cable is the important component part of distribution network, and electric power enterprise carries out the status monitoring work of cable to guarantee its safe operation.
Current, electric power enterprise adopts the method for itinerant monitor system usually, carrys out the shelf depreciation in monitoring cable by the pulse current measured on cable shield ground wire, thus indirectly grasps the electricity condition of cable, i.e. state of insulation.In transformer station, usually all provide external AC power supply, there is not the problem that monitoring system is powered.But, under many circumstances, the connector of cable or terminal are all on the road of city or suburb, obtaining external AC power supply is monitoring system difficulty when powering, the long-term on-line monitoring how carrying out cable easily or the short-term of fluidly carrying out several days or a few time-of-weeks are monitored continuously, become the difficult problem that always could not thoroughly solve.
In recent years, along with electricity marketization is carried out by country, power supply enterprise was forced fully to excavate the potential transport capacity of power cable.Therefore, the monitoring of cable Warm status is carried out gradually in electric power enterprise.Carrying out except running into power shortage outlying similar in the work of state of insulation field monitoring in process, also having a difficult problem to be the current information of how to avoid drawing longer signal wire from current transformer and obtaining three core distribution cables easily.
To sum up can learn, current exploitation has self-powered ability, and can simultaneously the electricity condition of monitoring cable and the monitoring system of Warm status are problems in the urgent need to address during current power enterprise produces easily.
[summary of the invention]
For the multiple deficiency that above-mentioned existing monitoring technology exists, the invention provides a kind of distribution cable comprehensive state on-line monitoring system and the method with self-powered ability.
The present invention is concrete by the following technical solutions:
This system adopts Split type core construction dexterously, solves the difficult problem recovered energy from three core distribution cables innovatively; Adopt temperature and high-frequency current sensing technology, complete the monitoring of cable heat and electric comprehensive state simultaneously; Adopt low energy consumption embedded technology, reach the minimized object of system energy consumption; Adopt intelligent algorithm, carry out the enforcement prediction of cable core temperature.The system be made up of above hardware and SFU software functional unit, have manufacture economical, convenient, use safety be installed, be easy to the feature safeguarded, achieve the distribution cable comprehensive state on-line monitoring with self-powered ability.
A kind of distribution cable comprehensive state on-line monitoring system with self-powered ability of the present invention, comprising: embedded system main frame, Split type iron core transducer, temperature measurement circuit and pulses of current sensor; Split type iron core transducer is enclosed within tested three core distribution cables optional position along the line, and the three-phase induction electric current that Split type iron core transducer exports is that system host is powered; Described temperature measurement circuit is close to tested cable surface, monitors cable temperature; Described pulses of current sensor is enclosed within cable shielding layer earthing line, monitors tested cable and whether there is paradoxical discharge.
Described Split type iron core transducer is primarily of insulation crust, A phase iron core and A phase winding, B phase iron core and B phase winding, C phase iron core and C phase winding, and Aviation Connector composition; Described A phase iron core, B phase iron core and C phase iron core be evenly arranged in the center of insulation crust for initial point circumferentially; Described A phase winding, B phase winding and C phase winding end link together, and are connected into a pin of aviation plug, and head end is connected to other three pins of aviation plug.
The three-phase induction electric current that described Split type iron core transducer exports is that system host is powered by controlled rectifier.
Described controlled rectifier exports aviation plug and insulation crust formation primarily of input aviation plug, three Y capacitance, controlled three core rectifier bridges, control center, direct supplys; Three described Y capacitance are connected between input aviation plug and controlled three core rectifier bridges; Described control center gathers the DC voltage after rectification, according to the load current that electric power triple cable flows through, automatically regulates conduction angle, to ensure that DC voltage is constant.
Described temperature measurement circuit is thermal resistance sensor and conditioning amplifying circuit thereof, and thermal resistance sensor is close to tested cable surface, and conditioning amplifying circuit is integrated in described system host.
Described pulses of current sensor forms primarily of sensor outer housing, ferrite, coil winding, integrating resistor and BNC connector; Described coil winding is evenly wound on wherein on half ferrite, and winding ends gets back to winding head end through winding, is formed and returns circle.
Described split core formula transducer insulation crust, controlled rectifier shell and pulses of current sensor insulation crust are made by epoxide resin material, and its insulation withstand strength is not less than 35kV.
A kind of distribution cable comprehensive state on-line monitoring method with self-powered ability, comprise the following steps: (1) iron core transducer during a division on tested three core distribution cables optional position cover along the line, stick temperature measuring equipment with monitoring cable temperature at tested cable surface, the bonding line of tested triple cable overlaps pulses of current sensor and whether there is paradoxical discharge to monitor tested cable; (2) the three-phase induction electric current exported by Split type iron core transducer is that system host is powered.
The three-phase induction electric current that described Split type iron core transducer exports is that system host is powered by controlled rectifier, after described controlled rectifier carries out rectification to the signal collected, according to the load current that electric power triple cable flows through, regulate conduction angle, to ensure that DC voltage is constant.
Described system host is by setting up thermal circuit model, and the analytic relationship of Skin temperature set up cable conductor and record, to calculate in real time tested cable fibre core temperature.
After adopting this design, the present invention at least tool has the following advantages:
1, Split type iron core transducer enclosure of the present invention and pulses of current sensor shell all have higher dielectric level, ensure that security when user of service operates this instrument;
When 2, using the present invention to carry out on-the-spot test, in tested distribution triple cable optional position along the line power taking, can ensure the monitoring carrying out a few week or several days carrying out on-line monitoring or mobility that pick-up unit is stable.
3, the present invention can monitor Warm status and the electricity condition of tested cable simultaneously, better can assess the state of cable.
4, the present invention can obtain the current signal of cable three core easily, thus avoids being obtained from current transformer by long signal wire.
5, apparatus of the present invention are lightweight, and volume is little, and it is convenient to measure.
[accompanying drawing explanation]
The above is only that the present invention program summarizes, and in order to more clearly demonstrate technological means of the present invention, elaborates to the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the System's composition figure of a kind of distribution cable integrated operation of the present invention state monitoring apparatus.
Fig. 2 is the structural representation of the iron core of Split type described in Fig. 1 transducer.
Fig. 3 is the structural representation of controlled rectifier described in Fig. 1.
Fig. 4 is the structural representation of pulses of current sensor described in Fig. 1.
[embodiment]
According to Figure of description, technical scheme of the present invention is described in further detail below.
Be illustrated in figure 1 the structural representation of a kind of distribution cable integrated operation of the present invention condition checkout gear, form primarily of embedded system main frame 13, Split type iron core transducer 14, controlled rectifier 15, temperature measurement circuit 16 and pulses of current sensor 17.Split type iron core transducer 14 is enclosed within the optional position of tested three core distribution cables along the line 11, Split type iron core transducer 14 export three-phase induction electric current through controlled rectifier 15 rectification, for system host 13 is powered.The control software design of controlled rectifier 15 adjusts the conduction angle of rectifier automatically according to the size of current that three core distribution cables flow through, to ensure that commutating voltage is constant.During measurement, Split type iron core transducer 14 is enclosed within triple cable 11, the sensor of temperature measurement circuit 16 is close to tested cable surface, pulses of current sensor 17 is enclosed within the bonding line 12 of triple cable 11.
As shown in Figure 2, described Split type iron core transducer 14 forms primarily of insulation crust 21, A phase iron core 22 and A phase winding 25, B phase iron core 23 and B phase winding 26, C phase iron core 24 and C phase winding 27, Aviation Connector 28.
Described A phase iron core 22, B phase iron core 23, C phase iron core 24 are evenly placed in insulation crust 21 groove, each at a distance of 120 °.Described A phase winding 25, B phase winding 26 and C phase winding 27 end link together, and are connected into a pin of aviation plug 28, and head end is connected to other three pins of aviation plug 28.
As shown in Figure 3, described controlled rectifier 15 is formed primarily of input aviation plug 31, three Y capacitance 32, controlled three core rectifier bridges 33, control center 35, direct supply output aviation plug 34 and insulation crust 36.Described control center 35 gather rectification after DC voltage, according to the load current that electric power triple cable flows through, automatically regulate conduction angle, to ensure that DC voltage is constant.
Described temperature measurement circuit is thermal resistance sensor and conditioning amplifying circuit thereof, and thermal resistance sensor is close to tested cable surface, and conditioning amplifying circuit is integrated in described main frame 13.
As shown in Figure 4, described pulses of current sensor 17 is made up of sensor outer housing 41, ferrite 42, coil winding 43, integrating resistor 44 and BNC connector (45).Described sensor outer housing (41) and ferrite (42) are open type structure.Described coil winding 43 is evenly wound on wherein on half ferrite, and winding ends gets back to winding head end through winding, is formed and returns circle.Described integrating resistor 44 is noninductive resistance.
Comprise intelligent evaluation unit in described embedded host, by setting up thermal circuit model, setting up cable conductor and the analytic relationship of the Skin temperature recorded, obtaining the accurate closed solutions of conductor temperature, can calculate in real time tested distribution cable core temperature.
Described Split type iron core transducer 14 directly can measure the signal of three-phase core electric current in cable, and transfers to the current signal monitoring carrying out cable three-phase core in described embedded host 13.
Described Split type iron core transducer insulation crust 21, controlled rectifier shell 36 and pulses of current sensor insulation crust 41 are made by epoxide resin material, and its insulation withstand strength is not less than 35kV.
Visible, the present invention's practical Split type iron core transducer, from three core distribution cable optional position induction power takings, can improve the convenience of detection.Can monitor the Warm status of tested cable and electricity condition simultaneously, guarantee power supply reliability and stability.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (10)
1. there is a distribution cable comprehensive state on-line monitoring system for self-powered ability, it is characterized in that: comprising: embedded system main frame (13), Split type iron core transducer (14), temperature measurement circuit (16) and pulses of current sensor (17); Split type iron core transducer (14) is enclosed within the optional position of tested three core distribution cables (11) along the line, and the three-phase induction electric current that Split type iron core transducer (14) exports is system host (13) power supply; Described temperature measurement circuit (16) is close to tested cable surface, monitors cable temperature; Described pulses of current sensor (17) is enclosed within cable shielding layer earthing line (12), monitors tested cable and whether there is paradoxical discharge.
2. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 1, it is characterized in that: described Split type iron core transducer (14) is primarily of insulation crust (21), A phase iron core (22) and A phase winding (25), B phase iron core (23) and B phase winding (26), C phase iron core (24) and C phase winding (27), and Aviation Connector (28) composition; Described A phase iron core (22), B phase iron core (23) and C phase iron core (24) be evenly arranged in the center of insulation crust (21) be initial point circumferentially; Described A phase winding (25), B phase winding (26) and C phase winding (27) end link together, and being connected into a pin of aviation plug (28), head end is connected to other three pins of aviation plug (28).
3. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 1, is characterized in that: the three-phase induction electric current that described Split type iron core transducer (14) exports is system host (13) power supply by controlled rectifier (15).
4. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 3, is characterized in that: described controlled rectifier (15) exports aviation plug (34) and insulation crust (36) formation primarily of input aviation plug (31), three Y capacitance (32), controlled three core rectifier bridges (33), control center (35), direct supplys; Three described Y capacitance are connected between input aviation plug (31) and controlled three core rectifier bridges (33); Described control center (35) gathers the DC voltage after rectification, according to the load current that electric power triple cable flows through, automatically regulates conduction angle, to ensure that DC voltage is constant.
5. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 1, it is characterized in that: described temperature measurement circuit is thermal resistance sensor and conditioning amplifying circuit thereof, thermal resistance sensor is close to tested cable surface, and conditioning amplifying circuit is integrated in described system host (13).
6. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 1, is characterized in that: described pulses of current sensor (17) forms primarily of sensor outer housing (41), ferrite (42), coil winding (43), integrating resistor (44) and BNC connector (45); Described coil winding (43) is evenly wound on wherein on half ferrite, and winding ends gets back to winding head end through winding, is formed and returns circle.
7. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 1, it is characterized in that: described split core formula transducer insulation crust (21), controlled rectifier shell (36) and pulses of current sensor insulation crust (41) are made by epoxide resin material, its insulation withstand strength is not less than 35kV.
8. there is a distribution cable comprehensive state on-line monitoring method for self-powered ability, it is characterized in that: comprise the following steps:
(1) iron core transducer (14) when putting a division in the optional position of tested three core distribution cables along the line (11), stick temperature measuring equipment with monitoring cable temperature at tested cable surface, the bonding line of tested triple cable overlaps pulses of current sensor and whether there is paradoxical discharge to monitor tested cable;
(2) the three-phase induction electric current exported by Split type iron core transducer (14) is system host (13) power supply.
9. a kind of distribution cable comprehensive state on-line monitoring method with self-powered ability according to claim 8, it is characterized in that: the three-phase induction electric current that described Split type iron core transducer (14) exports is system host (13) power supply by controlled rectifier (15), after described controlled rectifier (15) carries out rectification to the signal collected, according to the load current that electric power triple cable flows through, regulate conduction angle, to ensure that DC voltage is constant.
10. a kind of distribution cable comprehensive state on-line monitoring system with self-powered ability according to claim 1, it is characterized in that: described system host is by setting up thermal circuit model, the analytic relationship of Skin temperature set up cable conductor and record, to calculate in real time tested cable fibre core temperature.
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Cited By (6)
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| CN105425129A (en) * | 2015-12-25 | 2016-03-23 | 国网陕西省电力公司西安供电公司 | Portable device used for partial discharge online monitoring of high-voltage switch cabinet |
| CN105445586A (en) * | 2015-12-03 | 2016-03-30 | 金杯电工衡阳电缆有限公司 | Load temperature rise test method for power cable for thermonuclear fusion |
| CN108494107A (en) * | 2018-04-02 | 2018-09-04 | 国网冀北电力有限公司唐山供电公司 | A kind of induction type electricity-fetching method for three-core cable |
| CN111948488A (en) * | 2020-07-23 | 2020-11-17 | 广东电网有限责任公司 | Distribution cable fault monitoring system and use method |
| CN113589021A (en) * | 2021-07-19 | 2021-11-02 | 武汉三相电力科技有限公司 | Electricity taking system and method for three-core cable |
| CN113746214A (en) * | 2021-08-31 | 2021-12-03 | 西安交通大学 | Power supply circuit for three-core cable thermal state online monitoring system |
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Application publication date: 20151111 |