CN204188984U - The anti-liquefaction system of GIS device internal gas - Google Patents

Abstract

The anti-liquefaction system of GIS device internal gas, comprises the temperature measurement module be made up of thermistor RT1, and described temperature measurement module connects main control module, and described main control module connects voltage stabilizing supply module, heating module respectively; Described heating module comprises electric fan M, resistive heater, and described electric fan M, resistive heater connect main control module.The anti-liquefaction system of a kind of GIS device internal gas of the utility model, this system architecture is simply compact, economical and practical, working stability.Efficiently solve GIS device when the outdoor use of extremely frigid zones, the liquescent problem of sulfur hexafluoride gas.

Description

The anti-liquefaction system of GIS device internal gas

Technical field

The anti-liquefaction system of a kind of GIS device internal gas of the utility model, relates to GIS device temperature control field.

Background technology

Recent years, GIS(Gas Insulated Switchgear, Chinese is by name: sulfur hexafluoride sealed combination electrical equipment) obtain a wide range of applications in China's electrical network; Particularly increase newly in transformer station in city, due to difficulty of taking over the land for use, GIS becomes primary switchgear.High altitude localities weather complexity is various, time by the invasion and attack of humidity, condensation, salt fog and dust storm, add day by day flourishing industry and traffic, make the switchgear of electrical network very easily produce filth and corrosion, the conventional air insulated switching installation used in power distribution network is substituted by GIS switch mostly.At Northwest High Altitude cold district, because ambient temperature is too low, sulfur hexafluoride gas in GIS device is liquefied and causes the decreasing insulating of Whole Equipment, device interior generation shelf depreciation in causing thus running also finally may develop into serious short trouble.In the face of this problem, existing solution has: (1) uses mixed gas: use mixed gas if SF6 and N2 or SF6 and CF4 is to reduce its condensing temperature.But having its shortcoming to be different gas and vapor permeation, in order to reach original insulation effect, needing to improve design pressure, and then change existing product design.And once leak, because can not the volume ratio of accurate analysis gas leakage, cannot can direct make-up gas when leaking as pure SF6 gas, again change after gas indoor gas thoroughly must being reclaimed, complex process, execute-in-place is difficult.(2) rated operating pressure is reduced: reduce rated operating pressure, the liquefaction point of SF6 gas is reduced.But the method is only applicable to some areas, runs into extreme case and still there will be problem, and product design also can increase, the advantage of GIS is reduced.(3) external heating device is adopted: artificial input heat also increases attemperator, with use mixed gas or reduce compared with nominal pressure method, this way does not need to change product design, relative manner 1 and method 2 want more economical and more practical, but shortcoming is that machinery is passive wayward, needs the manpower and materials that cost is larger.

Summary of the invention

For solving the problems of the technologies described above, the utility model provides a kind of GIS device internal gas anti-liquefaction system, and this system architecture is simply compact, economical and practical, working stability.Efficiently solve GIS device when the outdoor use of extremely frigid zones, the liquescent problem of sulfur hexafluoride gas.

The technical scheme that the utility model is taked is:

The anti-liquefaction system of GIS device internal gas, comprises the temperature measurement module be made up of thermistor RT1, and described temperature measurement module connects main control module, and described main control module connects voltage stabilizing supply module, heating module respectively; Described heating module comprises electric fan M, resistive heater, and described electric fan M, resistive heater connect main control module.

Described temperature measurement module comprises operational amplifier U1, and operational amplifier U1 is as voltage follower, and operational amplifier U1 connects electric capacity C1 one end, field effect transistor Q3 drain electrode respectively, field effect transistor Q3 source electrode contact resistance R3 one end, resistance R3 other end ground connection; Electric capacity C1 other end contact resistance R1 one end, resistance R1 other end connecting triode Q1 emitter, triode Q1 collector connects field effect transistor Q2 drain electrode, and field effect transistor Q2 source electrode connects thermistor RT1 one end, thermistor RT1 other end ground connection; Field effect transistor Q2 grid, field effect transistor Q3 grid connect main control module.

Described voltage stabilizing supply module comprises transformer P1, and transformer P1 secondary side connects voltage stabilizing chip 7806 respectively, voltage stabilizing chip 7906, voltage stabilizing chip LM7805 carry out voltage transitions, obtains+6V ,-6V ,+5V power supply respectively.

Described electric fan M, resistive heater R5, resistive heater R8, resistive heater R11 connect main control module respectively by electromagnetic relay RL1, electromagnetic relay RL2, electromagnetic relay RL3, electromagnetic relay RL4, and electromagnetic relay RL1, electromagnetic relay RL2, electromagnetic relay RL3, electromagnetic relay RL4 connect protection diode D1, protection diode D2, protection diode D3, protection diode D4 respectively.

Described main control module is single chip computer AT mega16.

Described thermistor RT1 is multiple.

The anti-liquefaction system of a kind of GIS device internal gas of the utility model, technique effect is as follows:

1), sheet machine control self-adaption constant temperature control means come, card GIS device run under preference temperature, GIS device can be used at extremely frigid zones better.

2) whether, the working power of the utility model system is the same with supervising device power supply used with the protective device be integrated in GIS device, supplied separately, have electricity irrelevant with GIS device place mains network by transformer station's station local coordinate frame.Because be independently-powered, thus when GIS device is in running order, hot stand-by duty and cold standby state time, temperature control system all can normally work, and ensures that GIS device can put into operation at any time.

3), the core operating principle of the utility model system is: cross the temperature that multiple thermistor temperature sensor detects the inner liquescent place of sulfur hexafluoride gas of GIS device in real time, surveyed associated electrical signals is passed to main control singlechip.By the process of single-chip microcomputer, when detecting somewhere temperature lower than setting value, single-chip microcomputer sends control signal, start resistive heater and electric fan, make pipeline on GIS device inwall (when normally working, this pipeline communicates with GIS device inside) in sulfur hexafluoride gas heated and flowed in pipeline, thus the sulfur hexafluoride gas in GIS device is heated properly, makes it reach job requirement temperature.After single-chip microcomputer process, the lowest temperature angle value of every platform GIS device inside is transferred to central control room by signal transmssion line, is convenient to staff and observes and judge.When needs are to resistive heater and electric fan maintenance, turn off the valve at resistive heater and box two ends, electric fan place, open box and just can overhaul it.

Accompanying drawing explanation

Fig. 1 is the utility model system module connection diagram;

Fig. 2 is the temperature measurement module circuit diagram of the utility model system;

Fig. 3 is the voltage stabilizing supply module circuit diagram of the utility model system;

Fig. 4 is the heating module circuit diagram of the utility model system;

Fig. 5 is the main control module circuit diagram of the utility model system;

Fig. 6 is the control flow chart of the utility model system.

Embodiment

As shown in Figure 1, the anti-liquefaction system of GIS device internal gas, comprises the temperature measurement module be made up of thermistor RT1,

It is the main control module of core that described temperature measurement module connects single chip computer AT mega16, and described main control module connects voltage stabilizing supply module, heating module respectively.

Fig. 2 is temperature measurement module circuit diagram, and as shown in Figure 2, electric capacity C4 is used for discharge and recharge energy storage to temperature-measurement principle figure, and R4 is canonical reference resistance, and operational amplifier U1 makes voltage follower, and field effect transistor Q2, the Q3 of pnp triode Q1 and P raceway groove make gate controlled switch.RT1 is the good in oxidation resistance of thermistor platinum resistance, platinum resistance, and measuring accuracy is high, and temperature-measuring range is-200 DEG C ~ 850 DEG C.When temperature measurement module is in normal operating conditions, I/O mouth PA0, PA1, PA2 of single chip computer AT mega16 are for the shutoff of control Q1, Q2, Q3.When program initialization runs, first PA0, PA1, PA2 are set to low level, now Q1 conducting, Q2 and Q3 ends, and make C1 be discharged to completely, PD2 is high level.Then PA0, PA1 are set to high level, PA2 is set to low level, now Q1, Q3 cut-off, Q2 conducting, is charged to C1 by resistance R1, and single-chip microcomputer internal calculator resets and starts timing, detect PD2 mouth state, when PD2 mouth is detected as low level, the voltage namely on C1 is charged to completely, under single-chip microcomputer timer record from be charged to PD2 mouth and change low level time T1 into.Then PA0, PA1, PA2 are set to low level, Q1 conducting, Q2, Q3 end, and C1 is discharged to completely, and PD2 becomes high level.Finally PA0, PA2 are set to high level, PA1 is set to low level, now Q1, Q3 cut-off, Q2 conducting, is charged to C1 by thermistor RT1, and single-chip microcomputer internal timer resets and starts timing, detect the state of PD2 mouth, when PD2 mouth is detected as low level, the voltage namely on C1 is charged to completely, under single-chip microcomputer timer record from discharge into PD2 mouth and change low level time T2 into.Can T1/R1=T2/RT1 be obtained thus, the resistance value of thermistor RT1 can be tried to achieve, in conjunction with the resistance value of this thermistor and the linear corresponding relation of temperature, namely by the process of single-chip microcomputer internal processes, converse the temperature value of thermistor actual measurement.

Fig. 3 is voltage stabilizing supply module circuit diagram.220V alternating current, from the access of transformer P1 primary side, is 15V by transformer P1 step-down, then carries out voltage transformation respectively by voltage stabilizing chip 7806,7906 and LM7805 and obtain+6V ,-6V and+5V power supply, power to the related chip in temperature control system.Wherein F1, F2 are protective tube, diode D1, D2, D3 and D4 form bridge rectifier circuit, interchange is become direct current, polarity free capacitor C2, C4, C6, C8, C9, C10 are for eliminating supply harmonic, polar capacitor C1, C3, C5 and C7 are used for balanced voltage and export, and light emitting diode DS1, DS2 and resistance R1, R2 form power indicating circuit jointly.

Fig. 4 is heating module circuit diagram.The start and stop of electric fan M and resistive heater R5, R8, R11 are controlled by the I/O mouth PCO ~ PC3 of single-chip microcomputer.RL1 ~ RL4 is electromagnetic relay, and when control end is low level, the switch of relay is opened.Terminal AB accesses 220V alternating current, powers to electric fan and resistive heater.Diode D1 ~ D4 is for the protection of relay, and release relay coil back electromotive force, other resistance is used for current limliting.

Fig. 5 is main control module circuit diagram.Main control unit with single chip computer AT mega16 for core, be circumscribed with reset circuit and download program mouth, the I/O mouth PC0 ~ PC3 of single-chip microcomputer is for controlling heating module, PA0 ~ PA2 and PD2 is for controlling temperature measurement module, specifically be connected to mark in subgraph, the terminal with identical label represents that both are connected.

Fig. 6 is system operation programs process flow diagram.Enter initialization after system electrification, timer resets, and resistive heater and electric fan are all in halted state.Temperature measurement module detects in real time to the liquescent local temperature in GIS device inside, data measured is passed to single-chip microcomputer process, adopts data redundancy techniques to fix a breakdown data and misdata, obtains optimum lowest temperature angle value M comparing useful data.If the critical condensing temperature of sulfur hexafluoride gas is A, in order to prevent heating module frequent starting, set another a threshold values B larger than A, the difference of A and B is stabilization tolerance.Because in Various Seasonal, ambient temperature difference is comparatively large, also just means that outdoor GIS device is different at the heat dissipation rate of Various Seasonal, considers this point, be provided with three groups of resistive heaters in constant temperature system.When the optimum lowest temperature angle value M recorded is lower than critical temperature A, single-chip microcomputer internal timer starts timing, and starts electric fan and one group of resistive heater, and when being heated to 10 minutes, system temperature also lower than critical temperature, then opens two groups of resistive heaters.When being heated to 20 minutes, system temperature, still lower than critical temperature, just opens three groups of resistive heaters (according to the design of maximum heat dissipative shock wave, after opening three groups of resistive heaters, system temperature is certain to go up).Electric fan and resistive heater, once open, can work until single-chip microcomputer sends stop instruction, due to the effect of resistive heater always; sulfur hexafluoride gas gos up; until optimum minimum temperature is higher than setting valve B, single-chip microcomputer sends stop instruction, and resistive heater and electric fan are quit work.When system energization, the temperature of single-chip microcomputer and temperature measurement module cycle detection GIS device inside, realizes closed-loop control.

Claims (6)

1.GIS device interior preventing gas liquefaction system, comprises the temperature measurement module be made up of thermistor RT1, it is characterized in that, described temperature measurement module connects main control module, and described main control module connects voltage stabilizing supply module, heating module respectively; Described heating module comprises electric fan M, resistive heater, and described electric fan M, resistive heater connect main control module.

2. the anti-liquefaction system of GIS device internal gas according to claim 1, it is characterized in that, described temperature measurement module comprises operational amplifier U1, operational amplifier U1 is as voltage follower, operational amplifier U1 connects electric capacity C1 one end, field effect transistor Q3 drain electrode respectively, field effect transistor Q3 source electrode contact resistance R3 one end, resistance R3 other end ground connection; Electric capacity C1 other end contact resistance R1 one end, resistance R1 other end connecting triode Q1 emitter, triode Q1 collector connects field effect transistor Q2 drain electrode, and field effect transistor Q2 source electrode connects thermistor RT1 one end, thermistor RT1 other end ground connection; Field effect transistor Q2 grid, field effect transistor Q3 grid connect main control module.

3. the anti-liquefaction system of GIS device internal gas according to claim 1, it is characterized in that, described voltage stabilizing supply module comprises transformer P1, transformer P1 secondary side connects voltage stabilizing chip 7806 respectively, voltage stabilizing chip 7906, voltage stabilizing chip LM7805 carry out voltage transitions, obtains+6V ,-6V ,+5V power supply respectively.

4. the anti-liquefaction system of GIS device internal gas according to claim 1; it is characterized in that; described electric fan M, resistive heater R5, resistive heater R8, resistive heater R11 connect main control module respectively by electromagnetic relay RL1, electromagnetic relay RL2, electromagnetic relay RL3, electromagnetic relay RL4, and electromagnetic relay RL1, electromagnetic relay RL2, electromagnetic relay RL3, electromagnetic relay RL4 connect protection diode D1, protection diode D2, protection diode D3, protection diode D4 respectively.

5. the anti-liquefaction system of GIS device internal gas according to claim 1 or 2, is characterized in that, described main control module is single chip computer AT mega16.

6. the anti-liquefaction system of GIS device internal gas according to claim 1, it is characterized in that, described thermistor RT1 is multiple.