CN102411119B - 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
CN102411119B
CN102411119B CN 201110370233 CN201110370233A CN102411119B CN 102411119 B CN102411119 B CN 102411119B CN 201110370233 CN201110370233 CN 201110370233 CN 201110370233 A CN201110370233 A CN 201110370233A CN 102411119 B CN102411119 B CN 102411119B
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central processing
processing module
cpu central
multi
conversion unit
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CN 201110370233
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Chinese (zh)
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CN102411119A (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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合肥工业大学
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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 thecurrent 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 the high speed development of national economy, quantity and installed capacity that China's total installed capacity of hydropower total volume has also obtained very large development, especially large hydropower station obtained unprecedented development especially in recent years.For fear of " nest electricity ", the electric energy capacity that generator is sent is sent, and outlet line capacity and the electric pressure in power station improve constantly, and the 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 also has been subject to everybody attention, at present the parameter of high-tension cable safety monitoring is mainly contained running temperature and regular Insulation test.High-tension cable is when rated load operation, the cable core temperature is stable, if all can cause cable temperature to raise because the factors such as cable splice fault, protective metal shell insulation harm, insulation ag(e)ing produce circular current, in case in addition cable overload, the core temperature also will sharply rise, accelerate insulation ag(e)ing, even thermal breakdown occurs.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 by two kinds of methods to the running temperature parameter supervision of cable, a kind of is to hand the regular tour inspection of infrared thermometer or bury the temperature element monitoring underground, and another kind of mode is to monitor by bury temperature element underground in cable.Infrared measurement of temperature can only the detection streamer surface temperature, and easily is subjected to such environmental effects, and the inner difference of measured temperature numerical value and cable is very large; Common temperature element is owing to having electric conductivity, and the high-voltage electromagnetic induction easily damages temperature element and secondary device, 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 check the phenomenons such as whether multipoint earthing is arranged.Insulation test project cycle interval is long, and the test that must have a power failure, and affects normal power generation output.

Because the singularity in geographic position, power station, high-tension cable substantially all is in narrow and small cavern and the high electromagnetic environment, also lacks effectively for 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, measurement is counted many, scope is large, power utilization network for city 35KV is than better suited, particular surroundings in the power station is to adopt common temperature element to make secondary device easily be subject to high pressure 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 at present a kind of intelligent construction of hydropower stations needs that meet, be fit to Real-Time Monitoring power station 330KV cable temperature and state of insulation, can ensure again the intelligent device of monitoring equipment safety.

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, can't adapt to the problem of power station particular surroundings to solve existing high-tension cable device for detecting temperature and technology.

In order to achieve the above object, the technical solution adopted in the present invention 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 collecting conversion unit is by described CPU central processing module unit controls and to CPU central processing module unit transmission of digital signals;

One smooth transmit/receive module is by described CPU central processing module unit controls and to Data collecting conversion 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 respectively high-voltage cable joint to be measured place, and temperature detection signal is accessed described 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 accessed described Data collecting conversion unit.

The characteristics of power station of the present invention 330KV high-tension cable temperature and state of insulation intelligent monitoring device also are:

Described CPU central processing module unit by the minimum work system that corresponding I/O mouth forms, is solidified with initialization subroutine, data acquisition process subroutine, key assignments processing subroutine, display subroutine, warning output subroutine and communication subroutine by microprocessor, data storage RAM, latch, trigger, address decoder, crystal oscillator and electric capacity in the described microprocessor;

Described smooth transmit/receive module comprises multi-channel electronic switch, the multichannel photosensitive tube that is connected with the Data collecting conversion unit, the multi-path light power valve of access multi-channel electronic switch, the constant current source of electric current is provided to light-emitting tube by multi-channel electronic switch, described 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 multi-path light power valve 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 cooperates formation No. one fibre optic temperature sensor loop, the microprocessor of described CPU central processing module unit transmits control signal by the multi-channel electronic switch of trigger to the light transmit/receive module, multi-channel electronic switch is controlled successively each fibre optic temperature sensor loop, road of gating by control signal, the emergent light of light-emitting tube is through being received by photosensitive tube behind the corresponding fibre optic temperature sensor in the fibre optic temperature sensor loop that is strobed, and transfers to the Data collecting conversion unit after converting light signal to electric signal by photosensitive tube;

Described Data collecting conversion unit comprises multi-channel electronic switch, the filtering circuit of access 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 described smooth transmit/receive module output, the electric signal transmission that a plurality of current sensors are exported respectively is to the multi-channel electronic switch of Data collecting conversion unit, the microprocessor of described CPU central processing module unit transmits control signal by the multi-channel electronic switch of trigger to the Data collecting conversion unit, multi-channel electronic switch is controlled behind each road electric signal of gating successively the electric signal transmission that will be strobed to filtering circuit filtering by control signal, amplifies through the two-stage amplifying circuit successively again, the A/D change-over circuit converts the microprocessor that transfers to CPU central processing module unit after the corresponding digital signal to;

Described 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 described CPU central processing module unit is exported control signal by trigger to triode, triode under control signal control pilot relay work to be communicated with the external alert circuit, microprocessor and the bus driver of described 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 of access CPU central processing module unit is set, described liquid crystal display/key-press module comprises Liquid Crystal Module, keyboard, described Liquid Crystal Module is connected with the microprocessor of control line with CPU central processing module unit by data line, and described keyboard interrupts the I/O mouth by keyboard interface circuit with the microprocessor of CPU central processing module unit and is connected.

Compared with the prior art, 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.Simultaneously the present invention can in time arrive operating management department to the current main operational factor System of cable, has reduced operations staff's labour intensity, has greatly improved production efficiency.Apparatus of the present invention small volume possesses intelligent decision mechanism simultaneously, has the teledata exchange capacity, can directly be installed on terrain, meets intelligent hydroelectric power plant to the intelligent requirements of equipment.The present invention under the prerequisite of Measurement accuracy temperature data, has isolated the infringement of high voltage induction to secondary device and personnel by adopting fibre optic temperature sensor fully, and particularly cable has a power failure, send the infringement of electric moment to equipment.By 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, solve original method and can only rely on the rear problem of judging according to the Insulation test data analysis that has a power failure.Power station 330KV high-tension cable temperature and state of insulation intelligent monitoring device can after the operational factors such as analysis-by-synthesis temperature, protective metal shell circular current, be judged the reason that cable temperature raises according to operating load.

Description of drawings

Fig. 1 is 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 collecting conversion element 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 of fibre optic temperature sensor, current sensor, light transmit/receive module, Data collecting conversion 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 by optical fiber.Light transmit/receive module opto-electronic conversion electric signal, and be connected with the Data collecting conversion 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 collecting conversion unit.Light transmit/receive module, Data collecting conversion 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 corresponding control line.Fibre optic temperature sensor at first receives the light signal of light transmit/receive module emission, the light signal of output enters the light transmit/receive module and is converted to voltage signal after the sensor modulation, the leakage current signal of this voltage signal and current sensor induction is sent into the Data collecting conversion unit, and the Data collecting conversion unit is converted to digital signal input CPU central processing module unit after the electric signal that gathers is changed through filtering, amplification, A/D successively.

Referring to Fig. 2, in the present embodiment, CPU central processing module unit is mainly used in finishing the sequential control of measurement point, the scale transformation of temperature, voltage digital signal, analyzing and processing, the off-limit alarm judgement, 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 the minimum work system of component devices with address decoder U3, data storage RAM chip U4, latch U2, trigger U5 respectively by address wire, data line and control line.Wherein the multi-channel electronic switch in light emission driving/receiver module and the Data collecting conversion 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 for finishing the driving control of multipath light signal and receiving the fibre optic temperature sensor light signal in the present embodiment.Adopting constant current source I to drive luminotron D1-D3, is shared constant current source I of multi-channel electronic switch U13 switching realization multichannel luminotron D1-D3 of MAX306CPI by 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 successively gating of multi-channel electronic switch by 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 consist of the fibre optic temperature sensor loop, the fibre optic temperature sensor output optical signal is converted to voltage signal through each self-corresponding photosensitive tube, and this voltage signal is connected with multi-channel electronic switch U9 in the Data collecting conversion unit respectively.

Referring to Fig. 4, the collection of light transmit/receive module output signal and current sensor signal is finished in the Data collecting conversion unit 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 respectively the P1.0-P1.7 pin of CPU.

Referring to Fig. 5 a and Fig. 5 b, alarm output module is used for finishing 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 by model.Microprocessor U1 is by trigger U5 output control signal BJ control triode T1 in the CPU central processing module unit, thereby realize the 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 for finishing data demonstration and parameter setting.Display module adopts the liquid crystal crystal block of 192 X 64, can show simultaneously high-voltage cable three-phase temperature and current data, and Liquid Crystal Module is connected with the CPU central processing module by 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 by model.Button operation is complex function, when parameter arranges 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 collecting conversion unit is by described CPU central processing module unit controls and to CPU central processing module unit transmission of digital signals;
One smooth transmit/receive module is by described CPU central processing module unit controls and to Data collecting conversion 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 respectively high-voltage cable joint to be measured place, directly measure the temperature of high-voltage cable joint with described fibre optic temperature sensor, and temperature detection signal is accessed described 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, directly measure the protective metal shell leakage current, and current detection signal is accessed described Data collecting conversion unit.
2. power station 330KV high-tension cable temperature according to claim 1 and state of insulation intelligent monitoring device is characterized in that:
Described CPU central processing module unit by the minimum work system that corresponding I/O mouth forms, is solidified with initialization subroutine, data acquisition process subroutine, key assignments processing subroutine, display subroutine, warning output subroutine and communication subroutine by microprocessor, data storage RAM, latch, trigger, address decoder, crystal oscillator and electric capacity in the described microprocessor;
Described smooth transmit/receive module comprises multi-channel electronic switch, the multichannel photosensitive tube that is connected with the Data collecting conversion unit, the multi-path light power valve of access multi-channel electronic switch, the constant current source of electric current is provided to light-emitting tube by multi-channel electronic switch, described 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 multi-path light power valve 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 cooperates formation No. one fibre optic temperature sensor loop, the microprocessor of described CPU central processing module unit transmits control signal by the multi-channel electronic switch of trigger to the light transmit/receive module, multi-channel electronic switch is controlled successively each fibre optic temperature sensor loop, road of gating by control signal, the emergent light of light-emitting tube is through being received by photosensitive tube behind the corresponding fibre optic temperature sensor in the fibre optic temperature sensor loop that is strobed, and transfers to the Data collecting conversion unit after converting light signal to electric signal by photosensitive tube;
Described Data collecting conversion unit comprises multi-channel electronic switch, the filtering circuit of access 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 described smooth transmit/receive module output, the electric signal transmission that a plurality of current sensors are exported respectively is to the multi-channel electronic switch of Data collecting conversion unit, the microprocessor of described CPU central processing module unit transmits control signal by the multi-channel electronic switch of trigger to the Data collecting conversion unit, multi-channel electronic switch is controlled behind each road electric signal of gating successively the electric signal transmission that will be strobed to filtering circuit filtering by control signal, amplifies through the two-stage amplifying circuit successively again, the A/D change-over circuit converts the microprocessor that transfers to CPU central processing module unit after the corresponding digital signal to;
Described 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 described CPU central processing module unit is exported control signal by trigger to triode, triode under control signal control pilot relay work to be communicated with the external alert circuit, microprocessor and the bus driver of described 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 330KV high-tension cable temperature according to claim 2 and state of insulation intelligent monitoring device, it is characterized in that: liquid crystal display/key-press module that access CPU central processing module unit is set, described liquid crystal display/key-press module comprises Liquid Crystal Module, keyboard, described Liquid Crystal Module is connected with the microprocessor of control line with CPU central processing module unit by data line, and described keyboard interrupts the I/O mouth by keyboard interface circuit with the microprocessor of CPU central processing module unit and is connected.
CN 201110370233 2011-11-21 2011-11-21 Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station CN102411119B (en)

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