CN102411119A - Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station - Google Patents

Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station Download PDF

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Publication number
CN102411119A
CN102411119A CN2011103702337A CN201110370233A CN102411119A CN 102411119 A CN102411119 A CN 102411119A CN 2011103702337 A CN2011103702337 A CN 2011103702337A CN 201110370233 A CN201110370233 A CN 201110370233A CN 102411119 A CN102411119 A CN 102411119A
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central processing
processing module
cpu central
data acquisition
light
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CN102411119B (en
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解新胜
张建军
韩江洪
史久根
刘征宇
徐娟
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Hefei University of Technology
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Hefei University of Technology
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Abstract

The invention discloses an intelligent monitoring device for temperature and insulation state of a 330KV high-voltage cable in a hydropower station. The device is characterized by being provided with a central processing module unit (CPU), a data acquisition and conversion unit, a light transmitting/receiving module, an alarm output module, a plurality of optical fiber temperature sensors and a plurality of current sensors, wherein the data acquisition and conversion unit is used for transmitting digital signals to the CPU under the control of the CPU; the light transmitting/receiving module is used for transmitting electrical signals to the data acquisition and conversion unit; the alarm output module can be used for communication with a remote monitoring system; the optical fiber temperature sensors are respectively arranged at the joints of the high-voltage cable to be detected and used for connecting temperature detection signals to the light transmitting/receiving module; and the current sensors are respectively arranged on joint metal sheaths of the high-voltage cable to be detected and used for connecting current detection signals to the data acquisition and conversion unit. The device is particularly suitable for safety monitoring of the 330KV high-voltage cable in the hydropower station, can realize real-time monitoring of the temperature and the insulation state of the cable in the hydropower station, and can also ensure self safety.

Description

Power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device
Technical field
The present invention relates to high-tension cable measurement mechanism field, be specially a kind of power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device.
Background technology
Along with high speed development of national economy, quantity and installed capacity that China's total installed capacity of hydropower total volume has also obtained very big development, especially large hydropower station obtained unprecedented development especially in recent years.For fear of " nest ", the electric energy capacity that generator is sent is seen off, and the outlet line capacity and the electric pressure in power station improve constantly, and high-tension cables such as 330KV, 500KV, 750KV have obtained application in succession in the power station.High-tension cable is as the visual plant of power station electric weight output, and its security has also received everybody attention, and the parameter to the high-tension cable safety monitoring mainly contains running temperature and regular Insulation test at present.High-tension cable is when rated load operation; The cable core temperature is stable; If all can cause cable temperature to raise because factors such as cable splice fault, protective metal shell insulation harm, insulation ag(e)ing produce circular current, in case cable overload in addition, the core temperature also will sharply rise; Quicken insulation ag(e)ing, even thermal breakdown takes place.In order to ensure the safe operation of high-tension cable, most important to core conductor temperature, connector temperature, protective metal shell temperature and the protective metal shell insulating monitoring of high-tension cable.
In the practical application, main through two kinds of methods to the running temperature parameter supervision of cable, a kind of is that hand-held infrared thermometer is regularly gone the rounds measurement or buried the temperature element monitoring underground, and another kind of mode is through in cable, burying the temperature element monitoring underground.Infrared measurement of temperature can only the detection streamer surface temperature, and receives such environmental effects easily, and the inner difference of measured temperature numerical value and cable is very big; Common temperature element is owing to have electric conductivity, and high-tension electricity magnetic induction damages temperature element and secondary device easily, even threatens personal safety.
Test insulation resistance of main, protective metal shell insulation resistance and the withstand voltage ac test of major insulation after the cable insulation monitoring needs regularly to have a power failure, whether inspection has phenomenons such as multipoint earthing.The Insulation test project cycle is long at interval, and the test that must have a power failure, and influences normal power generation output.
Because the singularity in geographic position, power station, high-tension cable basically all is in narrow and small cavern and the high electromagnetic environment, also lacks effectively to power station 330KV high-tension cable temperature and insulation state on-line monitoring device at present.The applying date is that the patent documentation that January 16, application number in 2009 are CN200910045471.3 discloses " a kind of on-line monitoring system for high voltage cable "; This system adopts the wireless collection transmission mode, and measure dot number is many, and scope is big; Power utilization network for city 35KV is relatively to be fit to; Particular surroundings in the power station is to adopt common temperature element to make secondary device receive high pressure easily to damage on the one hand, and the geographical environment in power station and high electromagnetic environment are not suitable for wireless transmitting system on the other hand.
In sum, aspect the safety monitoring of power station high-tension cable, also do not have a kind of intelligent construction of hydropower stations needs that meet at present, be fit to monitoring power station 330KV cable temperature and state of insulation in real time, can ensure the intelligent device of monitoring equipment safety again.
Summary of the invention
The purpose of this invention is to provide a kind of power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device, to solve the problem that existing high-tension cable device for detecting temperature and technology can't adapt to the power station particular surroundings.
In order to achieve the above object, the technical scheme that the present invention adopted is:
The characteristics of power station of the present invention 330KV high-tension cable temperature and state of insulation intelligent monitoring device are to be provided with:
One CPU central processing module unit;
One data acquisition converting unit is by said CPU central processing module unit controls and to CPU central processing module unit transmission of digital signals;
One smooth transmit/receive module is by said CPU central processing module unit controls and to data acquisition converting unit transmission of electric signals;
One alarm output module, by CPU central processing module unit controls alerting signal output and with the remote monitoring system communication;
A plurality of fibre optic temperature sensors are installed on high-voltage cable joint to be measured place respectively, and temperature detection signal is inserted said smooth transmit/receive module;
A plurality of current sensors are installed on respectively on the high-voltage cable joint protective metal shell to be measured, and current detection signal is inserted said data acquisition converting unit.
The characteristics of power station of the present invention 330KV high-tension cable temperature and state of insulation intelligent monitoring device also are:
The minimum work system that said CPU central processing module unit is made up of through corresponding I/O mouth microprocessor, data storage RAM, latch, trigger, address decoder, crystal oscillator and electric capacity is solidified with initialization subroutine, data acquisition process subroutine, key assignments processing subroutine, display subroutine, warning output subroutine and communication subroutine in the said microprocessor;
Said smooth transmit/receive module comprises the multichannel light-emitting tube of multi-channel electronic switch, the multichannel photosensitive tube that is connected with the data acquisition converting unit, access multi-channel electronic switch, the constant current source of electric current is provided to light-emitting tube through multi-channel electronic switch; Said fibre optic temperature sensor has a light incident side and a light exit side separately; The light incident side of each fibre optic temperature sensor connects one to one with the multichannel light-emitting tube respectively; The light exit side of each fibre optic temperature sensor connects one to one with the multichannel photosensitive tube respectively; The light-emitting tube that is connected with same fibre optic temperature sensor, photosensitive tube cooperate formation No. one fibre optic temperature sensor loop; The microprocessor of said CPU central processing module unit transmits control signal through the multi-channel electronic switch of trigger to the light transmit/receive module; Multi-channel electronic switch is controlled each fibre optic temperature sensor loop, road of gating successively by control signal; Through being received by photosensitive tube behind the corresponding fibre optic temperature sensor, transferred to data acquisition converting unit after converting light signal to electric signal by photosensitive tube by the emergent light of light-emitting tube in the fibre optic temperature sensor loop of gating;
Said data acquisition converting unit comprises multi-channel electronic switch, inserts the filtering circuit of multi-channel electronic switch, the two-stage amplifying circuit that is connected with filtering circuit, the A/D change-over circuit that is connected with the two-stage amplifying circuit; The multi-channel electric signal of said smooth transmit/receive module output, the electric signal that a plurality of current sensor is exported respectively transfer to the multi-channel electronic switch of data acquisition converting unit; The microprocessor of said CPU central processing module unit transmits control signal through the multi-channel electronic switch of trigger to the data acquisition converting unit; Multi-channel electronic switch is controlled successively by control signal will be transferred to filtering circuit filtering by the electric signal of gating behind each road electric signal of gating, more successively through the two-stage amplifying circuit amplify, the A/D change-over circuit converts the microprocessor that transfers to CPU central processing module unit after the digital signal corresponding to;
Said alarm output module comprises the bus driver that is connected with remote monitoring system; And the relay of control warning circuit break-make, the triode of pilot relay work; The microprocessor of said CPU central processing module unit is exported control signal through trigger to triode; Triode control signal control down pilot relay work with connection external alert circuit; The microprocessor and the bus driver of said CPU central processing module unit connect and compose communication interface, realize the communication of CPU central processing module unit and remote monitoring system.
The characteristics of power station of the present invention 330KV high-tension cable temperature and state of insulation intelligent monitoring device also are:
Liquid crystal display/the key-press module that inserts CPU central processing module unit is set; Said liquid crystal display/key-press module comprises Liquid Crystal Module, keyboard; Said Liquid Crystal Module is connected with the microprocessor of control line with CPU central processing module unit through data line, and said keyboard interrupts the I/O mouth through keyboard interface circuit with the microprocessor of CPU central processing module unit and is connected.
Compared with present technology, beneficial effect of the present invention is embodied in:
The present invention efficiently solves the on-line real time monitoring problem of power station 330KV high-tension cable.The present invention simultaneously can in time be aggregated into operating management department to the current main operational factor of cable in real time, has reduced operations staff's labour intensity, has greatly improved production efficiency.Apparatus of the present invention volume is less, possesses intelligent decision mechanism simultaneously, has the teledata exchange capacity, can directly be installed on terrain, meets the intelligent requirements of intelligent hydroelectric power plant to equipment.The present invention passes through to adopt fibre optic temperature sensor, accurately measuring under the prerequisite of temperature data, has isolated the infringement of high voltage induction to secondary device and personnel fully, and particularly cable has a power failure, send the infringement of electric moment to equipment.Through current sensor monitoring record high-voltage cable metal sheath circular current rate of change and variation tendency are set, understand the state of insulation of cable, solved the problem that original method can only rely on the back that has a power failure to judge according to the Insulation test data analysis.Power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device can be judged the reason that cable temperature raises according to operating load after operational factors such as analysis-by-synthesis temperature, protective metal shell circular current.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is CPU central processing module element circuit figure of the present invention;
Fig. 3 a is light-emitting tube and multiplexer electronic switching for space figure in the light transmit/receive module circuit of the present invention;
Fig. 3 b is photosensitive tube circuit diagram in the light transmit/receive module circuit of the present invention;
Fig. 4 is data acquisition conversion unit circuit figure of the present invention;
Fig. 5 a is warning part control circuit figure in the alarm output module circuit of the present invention;
Fig. 5 b is circuit bus driver figure in the alarm output module circuit of the present invention;
Fig. 6 is liquid crystal display of the present invention/key-press module circuit diagram.
Embodiment
Referring to Fig. 1, power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device are to be made up of fibre optic temperature sensor, current sensor, light transmit/receive module, data acquisition converting unit, CPU central processing module unit, liquid crystal display/key-press module, alarm output module and power module in the present embodiment.Fibre optic temperature sensor is directly measured the temperature of high-voltage cable joint, and is connected with the light transmit/receive module through optical fiber.Light transmit/receive module opto-electronic conversion electric signal, and be connected with the data acquisition converting unit, light transmit/receive module control signal is sent by CPU central processing module unit.Current sensor is installed on the high-voltage cable joint protective metal shell, directly measures the protective metal shell leakage current, and current sensor output is connected with the data acquisition converting unit.Light transmit/receive module, data acquisition converting unit, CPU central processing module unit, liquid crystal display/key-press module, alarm output module and power module are integrated in a circuit board, and are connected with data line through the control corresponding line.Fibre optic temperature sensor at first receives the light signal of light transmit/receive module emission; The light signal of output gets into the light transmit/receive module and converts voltage signal into after the sensor modulation; The leakage current signal of this voltage signal and current sensor induction is sent into the data acquisition converting unit, and the data acquisition converting unit converts digital signal input CPU central processing module unit into after changing the electric signal of gathering through filtering, amplification, A/D successively.
Referring to Fig. 2, in the present embodiment, CPU central processing module unit is mainly used in the sequential control of accomplishing measurement point; The scale transformation of temperature, voltage digital signal; Analyzing and processing, off-limit alarm judge that parameter setting, measured value show the communication data exchange that reaches with supervisory system.CPU central processing module unit comprises that model is the microprocessor U1 of 89S8253, and model is 6116 data storage RAM chip U4, and model is the latch U2 of 74LS373; Model is the trigger U5 of 74LS377; Model is the address decoder U3 of 74LS138, crystal oscillator, electric capacity.Microprocessor U1 is connected with address decoder U3, data storage RAM chip U4, latch U2, trigger U5 respectively through address wire, data line and control line, the minimum work system of component devices.Wherein the multi-channel electronic switch in light emission driving/receiver module and the data acquisition converting unit is directly controlled in trigger U5 output, realizes that the automatic selection of multiple signals is switched.
Referring to Fig. 3 a and Fig. 3 b, the light transmit/receive module is used to accomplish the drive controlling of multipath light signal and receives the fibre optic temperature sensor light signal in the present embodiment.Adopting constant current source I driven for emitting lights pipe D1-D3, is the shared constant current source I of multi-channel electronic switch U13 switching realization multichannel luminotron D1-D3 of MAX306CPI through model, has guaranteed the stable and consistent of each road light source.The control signal of multi-channel electronic switch is provided by the Q0-Q3 pin of trigger U5 in the CPU central processing module unit, can realize the gating successively of multi-channel electronic switch through the control signal of control multi-channel electronic switch.A light-emitting tube and a photosensitive tube that each fibre optic temperature sensor is corresponding constitute the fibre optic temperature sensor loop; Fibre optic temperature sensor output light signal converts voltage signal into through each self-corresponding photosensitive tube, this voltage signal respectively with the data acquisition converting unit in multi-channel electronic switch U9 be connected.
Referring to Fig. 4, the data acquisition converting unit is accomplished the collection of light transmit/receive module output signal and current sensor signal in the present embodiment, signal condition and A/D conversion.Comprise in the circuit that model is multi-channel electronic switch U9, filtering circuit, the two poles of the earth amplifier circuit and the A/D change-over circuit of MAX306CPI.Multi-channel electronic switch U9 control signal is provided by the Q0-Q3 pin of trigger U5 in the CPU central processing module unit.The A/D change-over circuit can adopt 3 half A/D change-over circuit MC14433, and its digital signal output pin Q0-Q3 and position signal output pin DS1-DS4 connect the P1.0-P1.7 pin of CPU respectively.
Referring to Fig. 5 a and Fig. 5 b, alarm output module is used to accomplish the output of alerting signal in the present embodiment, and is the exchange of RS-485 bus driver U12 and the remote monitoring system realization communication data of 75176B through model.Microprocessor U1 is through trigger U5 output control signal BJ control triode T1 in the CPU central processing module unit; Thereby realize control to alarm relay J make and break contact; The serial communication interface of microprocessor U1 and RS-485 bus driver U12 are connected to form communication interface, can realize the data communication with remote monitoring system.
Referring to Fig. 6, liquid crystal display/key-press module is set in the present embodiment is used to accomplish data presentation and parameter setting.Display module adopts the liquid crystal crystal block of 192 X 64, can show high-tension cable three-phase temperature and current data simultaneously, and Liquid Crystal Module is connected with the CPU central processing module through data line, control line.Button is designed to 4 keys of 1 X, is that the keyboard interface circuit U10 of 82C79 is connected with the interruption I/O of CPU central processing module unit microprocessor U1 through model.Button operation is a complex function, when parameter is provided with for key is set, numerical shift, digital modifications, the digital storage key, button operation is divided into the display speed adjusting key during operation, shows close key.

Claims (3)

1. power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device is characterized in that being provided with:
One CPU central processing module unit;
One data acquisition converting unit is by said CPU central processing module unit controls and to CPU central processing module unit transmission of digital signals;
One smooth transmit/receive module is by said CPU central processing module unit controls and to data acquisition converting unit transmission of electric signals;
One alarm output module, by CPU central processing module unit controls alerting signal output and with the remote monitoring system communication;
A plurality of fibre optic temperature sensors are installed on high-voltage cable joint to be measured place respectively, and temperature detection signal is inserted said smooth transmit/receive module;
A plurality of current sensors are installed on respectively on the high-voltage cable joint protective metal shell to be measured, and current detection signal is inserted said data acquisition converting unit.
2. power station according to claim 1 330KV high-tension cable temperature and state of insulation intelligent monitoring device is characterized in that:
The minimum work system that said CPU central processing module unit is made up of through corresponding I/O mouth microprocessor, data storage RAM, latch, trigger, address decoder, crystal oscillator and electric capacity is solidified with initialization subroutine, data acquisition process subroutine, key assignments processing subroutine, display subroutine, warning output subroutine and communication subroutine in the said microprocessor;
Said smooth transmit/receive module comprises the multichannel light-emitting tube of multi-channel electronic switch, the multichannel photosensitive tube that is connected with the data acquisition converting unit, access multi-channel electronic switch, the constant current source of electric current is provided to light-emitting tube through multi-channel electronic switch; Said fibre optic temperature sensor has a light incident side and a light exit side separately; The light incident side of each fibre optic temperature sensor connects one to one with the multichannel light-emitting tube respectively; The light exit side of each fibre optic temperature sensor connects one to one with the multichannel photosensitive tube respectively; The light-emitting tube that is connected with same fibre optic temperature sensor, photosensitive tube cooperate formation No. one fibre optic temperature sensor loop; The microprocessor of said CPU central processing module unit transmits control signal through the multi-channel electronic switch of trigger to the light transmit/receive module; Multi-channel electronic switch is controlled each fibre optic temperature sensor loop, road of gating successively by control signal; Through being received by photosensitive tube behind the corresponding fibre optic temperature sensor, transferred to data acquisition converting unit after converting light signal to electric signal by photosensitive tube by the emergent light of light-emitting tube in the fibre optic temperature sensor loop of gating;
Said data acquisition converting unit comprises multi-channel electronic switch, inserts the filtering circuit of multi-channel electronic switch, the two-stage amplifying circuit that is connected with filtering circuit, the A/D change-over circuit that is connected with the two-stage amplifying circuit; The multi-channel electric signal of said smooth transmit/receive module output, the electric signal that a plurality of current sensor is exported respectively transfer to the multi-channel electronic switch of data acquisition converting unit; The microprocessor of said CPU central processing module unit transmits control signal through the multi-channel electronic switch of trigger to the data acquisition converting unit; Multi-channel electronic switch is controlled successively by control signal will be transferred to filtering circuit filtering by the electric signal of gating behind each road electric signal of gating, more successively through the two-stage amplifying circuit amplify, the A/D change-over circuit converts the microprocessor that transfers to CPU central processing module unit after the digital signal corresponding to;
Said alarm output module comprises the bus driver that is connected with remote monitoring system; And the relay of control warning circuit break-make, the triode of pilot relay work; The microprocessor of said CPU central processing module unit is exported control signal through trigger to triode; Triode control signal control down pilot relay work with connection external alert circuit; The microprocessor and the bus driver of said CPU central processing module unit connect and compose communication interface, realize the communication of CPU central processing module unit and remote monitoring system.
3. power station according to claim 2 330KV high-tension cable temperature and state of insulation intelligent monitoring device; It is characterized in that: the liquid crystal display/key-press module that inserts CPU central processing module unit is set; Said liquid crystal display/key-press module comprises Liquid Crystal Module, keyboard; Said Liquid Crystal Module is connected with the microprocessor of control line with CPU central processing module unit through data line, and said keyboard interrupts the I/O mouth through keyboard interface circuit with the microprocessor of CPU central processing module unit and is connected.
CN201110370233.7A 2011-11-21 2011-11-21 Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station Expired - Fee Related CN102411119B (en)

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CN103411701A (en) * 2013-08-22 2013-11-27 四川大学 Automatic temperature monitoring system for power station tail water or riverway water
CN103712713A (en) * 2013-12-16 2014-04-09 上海华魏光纤传感技术有限公司 Optical fiber temperature measurement host
CN103728044A (en) * 2014-01-17 2014-04-16 厦门大学 Contact type high-voltage electrical equipment temperature detection system
CN104180854A (en) * 2014-09-05 2014-12-03 广东梅雁吉祥水电股份有限公司 Safety monitoring device used for monitoring high-voltage conveying cable on hydropower station
CN105300450A (en) * 2015-11-04 2016-02-03 成都聚智工业设计有限公司 Novel cable detection device
CN105807179A (en) * 2014-12-31 2016-07-27 保定华电电气有限公司 Insulation monitoring device for high-voltage cable sheath
CN105866648A (en) * 2016-06-24 2016-08-17 国网河南长葛市供电公司 Insulation detecting system for power transmission cables
CN106908648A (en) * 2017-01-13 2017-06-30 国网山东省电力公司巨野县供电公司 A kind of cable head temperature monitors O&M device
CN106950467A (en) * 2017-03-06 2017-07-14 温州电力建设有限公司 A kind of cable insulation situation on-line monitoring device
CN107300427A (en) * 2017-08-03 2017-10-27 南京科瑞电力科技有限公司 A kind of temperature warning system and method for power distribution network primary equipment
CN108627738A (en) * 2017-03-16 2018-10-09 宝钢特钢有限公司 A kind of on-Line Monitor Device and monitoring method for monitoring electroslag furnace water-cooled cable
CN109738770A (en) * 2019-03-05 2019-05-10 四川艾德瑞电气有限公司 A kind of integration insulating tube type busbar connector monitoring system
CN110146297A (en) * 2019-04-30 2019-08-20 中国航发南方工业有限公司 Sensor power supply and data acquisition circuit, gas turbo-generator set
CN112858859A (en) * 2021-04-19 2021-05-28 江苏森海电气有限公司 Crosslinked polyethylene power cable insulation monitoring device

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CN103411701A (en) * 2013-08-22 2013-11-27 四川大学 Automatic temperature monitoring system for power station tail water or riverway water
CN103712713A (en) * 2013-12-16 2014-04-09 上海华魏光纤传感技术有限公司 Optical fiber temperature measurement host
CN103712713B (en) * 2013-12-16 2017-01-04 江西华神智能物联技术有限公司 Optical fiber temperature measurement host
CN103728044A (en) * 2014-01-17 2014-04-16 厦门大学 Contact type high-voltage electrical equipment temperature detection system
CN104180854A (en) * 2014-09-05 2014-12-03 广东梅雁吉祥水电股份有限公司 Safety monitoring device used for monitoring high-voltage conveying cable on hydropower station
CN105807179A (en) * 2014-12-31 2016-07-27 保定华电电气有限公司 Insulation monitoring device for high-voltage cable sheath
CN105300450A (en) * 2015-11-04 2016-02-03 成都聚智工业设计有限公司 Novel cable detection device
CN105866648A (en) * 2016-06-24 2016-08-17 国网河南长葛市供电公司 Insulation detecting system for power transmission cables
CN106908648A (en) * 2017-01-13 2017-06-30 国网山东省电力公司巨野县供电公司 A kind of cable head temperature monitors O&M device
CN106950467A (en) * 2017-03-06 2017-07-14 温州电力建设有限公司 A kind of cable insulation situation on-line monitoring device
CN108627738A (en) * 2017-03-16 2018-10-09 宝钢特钢有限公司 A kind of on-Line Monitor Device and monitoring method for monitoring electroslag furnace water-cooled cable
CN107300427A (en) * 2017-08-03 2017-10-27 南京科瑞电力科技有限公司 A kind of temperature warning system and method for power distribution network primary equipment
CN109738770A (en) * 2019-03-05 2019-05-10 四川艾德瑞电气有限公司 A kind of integration insulating tube type busbar connector monitoring system
CN110146297A (en) * 2019-04-30 2019-08-20 中国航发南方工业有限公司 Sensor power supply and data acquisition circuit, gas turbo-generator set
CN110146297B (en) * 2019-04-30 2021-06-25 中国航发南方工业有限公司 Sensor power supply and data acquisition circuit and gas turbine generator set
CN112858859A (en) * 2021-04-19 2021-05-28 江苏森海电气有限公司 Crosslinked polyethylene power cable insulation monitoring device

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