0.4kV the remote temperature sensing of low tension switch and supervisory system and method
The present invention relates to the online remote temperature sensing technology at the charged position of 0.4KV low tension switch monitored the System and method for of low tension switch running status in a kind of temperature control automatic technology, the particularly comprehensive automation of transformer station's microcomputer.
The transformer station of domestic present application microcomputer comprehensive automation, automated system from function, structure, operational reliability, ease of use, safeguard that terseness, aspects such as upgrading rapidity etc. have showed great superiority.But the popular and ripe integrated automation of transformation stations is used for the above high-pressure system (electric company is in the majority) of 10KV mostly.High pressure inlet wire more than common 35KV or the 10KV is through the factory power supply system of secondary step-down; Automatically-monitored and the protection that its distribution equipment is implemented generally only relates to 35KV or 10KV transformer station or transformer; Seldom there is producer to consider the 0.4KV low-voltage power supply system is implemented " remote measurement "; Even considered " remote measurement " that also only be confined to electric current, voltage parameter; Do not take this vital parameter of temperature into account, make existing automated system lack effective monitoring means always, most stages that still rest on person on duty's manual patrol and inspection for the operation of the maximum 0.4KV low tension switch of potential faults in the transformer station.Checking efficiency is low, ignores easily and omits potential faults, usually is repairing again after breaking down or causing damage, and is difficult to accomplish preventative maintenance targetedly and processing.Can't react the duty in the actual switch operational process again through general electric current, the isoparametric monitoring of voltage comprehensively, especially can't react low tension switch have no abnormal, whether exist the shortcoming and potential faults.
Summary of the invention
For solving an above-mentioned difficult problem that 0.4KV low tension switch running status is lacked effective monitoring means; The present invention provides a kind of temperature through charged position, online remote measurement 0.4KV low tension switch contact; Realize system and method to the monitoring of 0.4KV low tension switch; In time find switch faults such as low because of voltage, that electric current big, bear that load is excessive, wiring loosening or main contacts that inner contact loose contact and other reasons cause is overheated; In time follow the tracks of the variation of temperature rise, the remote temperature sensing of switch is combined realization long-haul telemetry and monitoring with automation of transformation substations technology.
The remote temperature sensing of 0.4KV low tension switch of the present invention and monitoring; Mainly comprise temperature sensor, band communication function temperature polling instrument, on-the-spot RTU and the RTU of master station, the computing machine of monitoring software is installed; Its signal flow relation is: temperature sensor is sent the temperature signal of each main contacts of 0.4KV low tension switch into temperature polling instrument; The temperature polling instrument and the on-the-spot RTU of band communication function carry out communication, and temperature signal is sent into on-the-spot RTU, and on-the-spot RTU delivers to the RTU of master station with signal again; The RTU of master station carries out communication with computing machine again, the switch contact temperature value and the warning picture of display screen monitoring on computers.
The said temperature logging can use the thermal module of PLC (programmable controller) to replace, and on-the-spot RTU and the RTU of master station are replaceable simultaneously is on-the-spot PLC and the PLC of master station.
The remote temperature sensing and the method for supervising of 0.4KV low tension switch of the present invention comprise the steps:
(1) detect the temperature that each phase contact of 0.4KV low tension switch passes in and out tape electricity position with temperature sensor, sensor is delivered to temperature polling instrument with the temperature signal of contact, shows contact temperature at temperature polling instrument;
(2) temperature polling instrument and the on-the-spot RTU of band communication function carry out communication, and the temperature signal of each phase contact of 0.4KV low tension switch is sent into on-the-spot RTU;
(3) on-the-spot RTU carries out data communication through communication cable and the RTU of master station, and temperature signal is delivered to the RTU of master station;
(4) RTU of master station carries out communication with the computing machine of master station again; Obtain the temperature value of all on-the-spot each phase contacts of on-the-spot 0.4KV low tension switch; Through the monitoring software on the operation computing machine, the switch contact temperature value and the warning picture of display screen monitoring are on computers realized monitoring temperature;
(5) report to the police when the temperature departure normal value and when surpassing the scope of regulation, in time find the ERST of switch, be convenient to operator on duty or the maintenance personal hidden danger of in time checking targetedly and fix a breakdown.
In the step (1), described sensor can be stickup on the turnover tape electricity position of each phase main contacts of low tension switch, fixing SMD temperature sensor, also can use non-contacting sensor to carry out selection of temperature signal.
Temperature polling instrument in step (1), (2) can replace with the thermal module of PLC, and on-the-spot RTU and the RTU of master station in step (2), (3) (4) changes on-the-spot PLC and the PLC of master station into simultaneously, can realize said temperature remote measurement and monitoring equally.
The present invention is through carrying out overall monitor to 0.4KV low tension switch three-phase contact temperature; The distribution situation of being convenient to pass in and out mutually the temperature value of line contact confirms whether switch has problems and hidden danger through each; Through failure cause or the fault coverage that the isoparametric analysis-by-synthesis of electric current, the voltage of remote temperature sensing situation and switch is helped judge that switch possibly exist; Example: if having only A phase leading-out terminal contact temperature higher; Possibly be the loosening or loose contact of A phase leading-out terminal cable, also possibly be A phase long-term load two causes the overheated heat transfer in contact to reasons such as leading-out terminals greater than other mutually; If low tension switch three-phase contact temperature is higher comprehensively, but the temperature difference of turnover line is very little, then possibly be reasons such as the bigger than normal or switch heat radiation of load is bad; If low tension switch three-phase contact temperature is higher comprehensively, the temperature difference of turnover line is bigger, then possibly be reasons such as big or other self problems of switch contact contact resistance.Help our timely failure judgement hidden danger through analysis, confirm maintenance program above-mentioned actual motion state.
The present invention can also carry out " remote measurement " to charged 0.4KV low tension switch contact temperature to online; Through online " remote measurement " of temperature and combining of automation of transformation substations technology; Realization further improves the automatization level of transformer station to the monitoring in the running status of 0.4KV low tension switch, has widened the monitoring range of the automation of transformation substations greatly; In real time transformer station's low tension switch or supply line are monitored; In time find fault and hidden danger, be convenient to on-call maintenance equipment, improve the reliability of equipment operation.The widening of monitoring range also makes the most of important parameters that need in the equipment routing inspection to pay close attention to included in the scope of automation of transformation substations monitoring; Alleviated daily workload of patrolling and examining; Checking efficiency and specific aim have been improved; And can substitute transformer station's conventional artificial equipment routing inspection to a great extent, saved human resources greatly.
Description of drawings
Fig. 1 is sensor of the present invention and temperature polling instrument synoptic diagram.
Fig. 2 is temperature polling instrument and on-the-spot RTU communication flow figure.
Fig. 3 is on-the-spot RTU RTU of master station and host computer workflow diagram.
Each component symbol explanation:
1,2-low tension switch, 3-temperature polling instrument, 4-on-the-spot RTU (Remote Terminal Unit remote terminal controlling of sampling unit), the RTU of 5--master station, 6-computing machine (2,1 is equipped with 1 usefulness)
Below in conjunction with accompanying drawing and instance the present invention is further specified.
With reference to Fig. 1,2,3, the remote temperature sensing of 0.4KV low tension switch of the present invention and supervisory system, mainly comprise temperature sensor, band communication function temperature polling instrument, on-the-spot RTU, the RTU of master station, the computing machine of monitoring software is installed.
The remote temperature sensing and the method for supervising of 0.4KV low tension switch of the present invention comprise the steps:
(1) detect the temperature that each phase contact of 0.4KV low tension switch passes in and out tape electricity position with temperature sensor, this instance adopts SMD temperature sensor, to stickup, fixed temperature sensor on all 0.4kv low tension switches of transformer station.As shown in Figure 1, corresponding 6 points for measuring temperature of each 0.4kv switch, then per two low tension switches then have 12 points for measuring temperature, i.e. 12 SMD temperature sensors.The three-phase that low tension switch turnover line low tension switch is pasted, is fixed to SMD temperature sensor with organosilicon heat-conducting glue bonding agent passes in and out stickup on line main contacts copper bar or the Wiring nose, fixing; This SMD temperature sensor integral insulation; On the copper bar of contact, the Wiring nose; This SMD temperature sensor integral insulation, 0-150 ℃ of sensing ranges.
(2) use the temperature polling instrument 3 of being with communication function in the instance, each temperature polling instrument 3 can be gathered the temperature signal of 12 points for measuring temperature of monitoring, and promptly per 1 temperature polling instrument can detect the contact temperature value of two low tension switches.The KSL series of temperatures logging that the Kunlun, temperature polling instrument Beijing seashore company produces; The thermometric passage of each point for measuring temperature all can operation to specifications independently carry out the setting of range, alarming value; And can independently set each passage zero point and full scale correction; Can effectively reduce sensor error, improve The measuring precision.KSL series of temperatures logging has the RS485 serial communication function, and the temperature signal that temperature polling instrument is sent into each sensor transmits temperature data through the RS485 communication port to on-the-spot RTU after being automatically converted to digital quantity.
(3) on-the-spot RTU4 carries out data communication through self communication port and temperature polling instrument.On-the-spot RTU carries out data communication through the communication port and the temperature polling instrument of five string cards, uses the RS485 serial ports, reads the temperature digital signal of each passage with the communications command of temperature polling instrument.Five serial port boards send to CPU board to the temperature value data that read through the bus of on-the-spot RTU4 mainframe box; After CPU board is received the temperature value data; Program becomes China Power stipulations standard CD T91 digital signal to all packing data, sends to FSK plate (modulatedemodulate tuned plate) via the RS232 serial ports on the CPU board.The FSK plate is modulated into simulating signal to the digital signal of receiving, is divided into data feedback channel and down going channel, and row is sent to the RTU5 of master station by telecommunication cable through channel switching.
(4) RTU5 of master station receives each minute FSK plate of delivering in MODEM (modulator-demodular unit) cabinet of the simulating signal uploaded of transformer station and carries out demodulation; The FSK plate send the digital signal that demodulation is come out in the MOXA card (multi-serial-port card) by the RS232 serial ports; Multi-serial-port card is changed the digital signal of receiving; Become the Network Transmission signal of ICP/IP protocol, send to the network switch through the LAN lan interfaces on the multi-serial-port card.The computing machine 6 of master station is connected with the network switch of the RTU5 of master station; Collect the TCP/IP packet that sends from multi-serial-port card; Multi-serial-port card driving in the server is separated the TCP/IP bag of receiving and is bundled into the message that meets CDT91 electric power stipulations standard; The EpSynall monitoring software of installing on the computing machine by the electric power enterprise exploitation makes an explanation to CDT91 electric power stipulations standard, extracts the information that comprises in the stipulations message, on the picture of monitoring software, shows corresponding switch temperature measured value.
(6) the real-time temperature signal of the three-phase contact of the low tension switch of computing machine 6 all substations of monitoring of master station sends information when temperature drift.Reach more than 60 ℃ this switch picture color by green yellowing when temperature signal is higher in the instance, the prompting person on duty pays close attention to the duty of this switch; Reach when temperature signal is higher that this switch picture color becomes redness by green more than 70 ℃, and send the auditory tone cues of " switch temperature transfinites ", remind the person on duty to handle as early as possible, avoid causing the accident.
It is pointed out that the branch that when having only a transformer station, does not then have on-the-spot RTU4 and the RTU5 of main website, be equivalent to have only the RTU of master station, omitted the communication between on-the-spot RTU4 and the RTU5 of main website, all the other steps are the same, and are more simple.
In sum, the temperature signal of the 0.4KV low tension switch that SMD sensor is incited somebody to action is delivered to temperature polling instrument 3, signal is delivered to the on-the-spot RTU4 of transformer station through the RS485 connection.Signal becomes audio analog signals through five serial port boards, bus, CPU, the FSK plate of on-the-spot RTU, through special-purpose communication cable signal is uploaded to the RTU5 of master station and carries out data processing.The RTU5 of master station is reduced into digital signal through the FSK plate with audio analog signals again, digital signal is sent into the MOXA card of the RTU5 of master station.The MOXA card and the network switch of the RTU5 of master station carry out network communication, and the network switch of the RTU5 of master station and computing machine 6 carry out data communication.On the computing machine of master station; Through moving and be provided with corresponding configuration software; And combine with " remote measurement ", " remote control ", " remote signalling " technology of transformer station; Signals such as the electric current through low pressure being established switch, voltage carry out " remote measurement ", to the switch branch, close " remote signalling " signal that shape carries out " remote control " and obtains switch.Obtain the real time temperature signal of three-phase contact of the low tension switch of all substations like this in master station; The temperature of thousands of points of hundreds of is shown on server interface simultaneously; Realization is to all low tension switches of each substation, the real-time monitoring of transformer equitemperature; In time grasp the low tension switch state; Variation through temperature rise and electric current, the magnitude of voltage of inductive switch are judged whether its user mode is normal finds that in time switch reaches the switch contact oxidation contact resistance overheated hidden danger of switch that causes such as big because of overload, wiring are loosening.Pass through software setting; System monitoring can be realized automatic sound, light and color warning to the overtemperature signal; The location name and the warning reason of the low tension switch that reporting to the police appears in the person on duty of prompting transformer station; The person on duty can implement the operation that " remote control " divides, closes to switch immediately according to alarm condition, or carries out site inspection targetedly and handle.