CN111600267A - Water cooling system of direct-current ice melting device of high-voltage transmission line and control method of water cooling system - Google Patents
Water cooling system of direct-current ice melting device of high-voltage transmission line and control method of water cooling system Download PDFInfo
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Abstract
The invention discloses a water cooling system of a direct-current ice melting device of a high-voltage transmission line and a control method thereof. The invention overcomes the problems of communication fault, abnormal instrument, frequent water leakage, damaged valve pump body, unqualified water quality and the like which are easy to occur in the existing water cooling device, simultaneously adds partial equipment and logic functions, ensures that the system has the advantages of high reliability, strong adaptability, high automation degree and the like during working, adopts variable frequency driving, not only has controllable pressure, flow and speed during the starting and stopping processes of the cooling water system, but also can freely adjust the cooling water temperature along with the heating condition of the IGBT, and has obvious energy-saving effect.
Description
Technical Field
The invention belongs to the technical field of water cooling systems of direct-current ice melting devices of high-voltage transmission lines, and particularly relates to a water cooling system of a direct-current ice melting device of a high-voltage transmission line adopting an IGBT module, and a control method of the water cooling system of the direct-current ice melting device of the high-voltage transmission line adopting the IGBT module.
Background
In 2008, a hundred-year disaster of extremely large snow occurs in southern China, destructive attack is caused to a Guizhou power grid, 88 counties (cities and districts) of 9 prefectures in the Guizhou province are affected by power failure, and 11 counties are powered off. 29 disaster-stricken shutdown is carried out on 45 500kV lines, and 94 disaster-stricken shutdown is carried out on 147 220kKV lines; the 500kV and 220kV line collapse is 169 base and 147 base respectively; there are 5 total station blackouts in 12 500kV substations and 27 total station blackouts in 51 220kV substations.
The ice melting devices are installed in the transformer substations of 110kV, 220kV and 500kV in the post-disaster Guizhou province, the ice melting devices which are operated at present are produced by a plurality of manufacturers, the ice melting devices are operated for more than ten years, water cooling systems of the ice melting devices are generally purchased by manufacturers of the ice melting devices, the types of the ice cooling systems are more, the universality of equipment accessories is poor, and the manufacturers stop producing part of ice melting devices even due to long years.
Table 1: guizhou province ice melting device water cooling system fault condition statistical table
The fault equipment in table 1 mainly includes system communication, control card, pump, valve, water quality index testing instrument, etc. Besides the faults listed in the table, the existing ice melting device has the difficulty in water replenishing; resins that purify water are susceptible to deterioration; the water service pipe of the wind-water heat dissipation cooler is easy to freeze and block the pipe in extreme low temperature weather. Therefore, the original equipment has the defects of poor stability and large system maintenance amount.
Due to the requirements of environment, energy and social high efficiency, power electronic devices and systems are developing towards high frequency, intelligence, full digital, systematization and greening of application technologies. Rectifiers and inverters using igbts (insulated Gate bipolar converters) as main power devices can improve efficiency, reduce noise, reduce weight and volume of equipment, and are widely applied to the fields of industry, household appliances, new energy sources and the like. The IGBT element as the CPU element of the power electronic device is the core device for energy conversion and transmission, and has the advantages of small driving power and low saturation voltage drop. At present, a new-generation ice melting device mainly comprises an IGBT (insulated gate bipolar transistor) commutation unit, a driving circuit, a direct-current supporting capacitor, a radiating fin, an in-situ controller, a structural component and the like. Compared with the traditional direct current ice melting device based on the thyristor, the IGBT ice melting device has small output current harmonic content, does not need to be provided with a filter, and can realize real zero-start boosting and zero-start current rising when running in a direct current ice melting mode. The ice melting device is usually composed of a plurality of power unit modules, the maximum heat productivity of a single high-power IGBT module and a single thyristor can reach more than 2KW in work, once the core temperature in the IGBT reaches 150 degrees (novel 180 degrees), the core temperature is burnt and even exploded, and therefore a cooling device with stable performance and reliable quality needs to be researched and developed to carry out heat dissipation protection on a core power element.
The heat dissipation mode in industry mainly includes several modes such as air cooling, heat pipe cooling, water cooling, etc., wherein the water cooling with extremely high heat exchange coefficient is undoubtedly the best effect, so the water cooling mode is widely used. Pure water is widely used in the electrical industry due to its high thermal capacity, stability, and good non-conductivity and readily available characteristics. By considering the pure water cooling of the stator coil of the large-scale turbonator, the IGBT heat dissipation pipeline is ensured not to be corroded, scaled, blocked, overheated, burnt and the like.
The schematic diagrams of the existing typical cooling system are shown in fig. 1 and fig. 2, and the specific flow is as follows:
typical cooling system 1: a water replenishing flow unit: the water replenishing tank → the water replenishing pump (B3) screen (W2) → solenoid valve (K) → the replenishing system. A cooling water flow process unit for ice melting: the buffer water tank → the cooling water main pump (B1/B2) → the screen (W1) → the IGBT valve bank → the flow meter (F1, F2) → the water-wind heat exchange Cooler (CW) → the buffer water tank. A water quality monitoring flow unit: buffer water tank → cooling water main pump (B1/B2) → strainer (W1) → conductivity monitor (CC1) → buffer water tank. A water quality purification process unit: buffer water tank → cooling water main pump (B1/B2) → strainer (W1) → resin ion exchanger (C1/C2) → strainer (W3) → flow meter (F3) → buffer water tank.
Typical cooling system 2: a water replenishing flow unit: water replenishing tank → water replenishing pump (B3) → filter screen (W2) → system replenishment. A cooling water flow process unit for ice melting: the high-level water tank → a cooling water main pump (B1/B2) → a screen (W1) → a flow meter (F1) → an IGBT valve group → a water-wind heat exchange Cooler (CW) → the high-level water tank. Thirdly, a meter monitoring flow unit: high-level water tank → cooling water pump (B1/B2) → strainer (W1) → conductivity monitor (CC1) → high-level water tank. A water quality purification process unit: high-level water tank → cooling water pump (B1/B2) → strainer (W1) → resin ion exchanger (C1/C2) → strainer (W3) → flow meter (F2) → high-level water tank.
In summary, the following problems exist:
(1) the pump set of the water cooling system of the existing ice melting device is driven by power frequency, and when the pump set is started and stopped, the phenomena of gas blockage, fluid inertia and the like exist in a pipeline, the pipeline is easy to generate short-time overpressure, water hammer and the like locally, and strong impact is generated on the system, so that the leakage of the pipeline system is caused;
(2) the existing ice melting device mainly controls a PLC on site, has long operating age limit, serious element aging, poor communication reliability, inconvenient function upgrading and data updating, limited expansion development and external interface functions and is easily limited by manufacturers.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the water cooling system and the method of the high-voltage transmission line direct-current ice melting device adopting the IGBT module overcome the problems of communication faults, abnormal instruments, frequent water leakage of the device, damage of a valve pump body, unqualified water quality and the like which are easy to occur to the existing water cooling device, and simultaneously optimize partial equipment and logic functions, so that the system has the advantages of high working reliability, strong expandability, high automation degree and the like.
The technical scheme adopted by the invention is as follows: the utility model provides an adopt water cooling system of high tension transmission line direct current ice-melt device of IGBT module, including high flush tank, the cooling water main pump, water wind heat transfer cooler and IGBT valves, high flush tank passes through pipe connection to the cooling water main pump, the cooling water main pump passes through pipe connection to IGBT valves, water wind heat transfer cooler installs on the pipeline between cooling water main pump and IGBT valves, the IGBT valves passes through pipe connection to high flush tank, the motor of cooling water main pump adopts frequency conversion drive mode.
Preferably, an electric heating device is installed in the high-level water tank.
Preferably, an orifice plate flowmeter is mounted on the pipeline between the cooling water main pump and the IGBT valve bank.
Preferably, the output pipeline of the water-air heat exchange cooler is connected with a pure water conductivity and pH value monitor in a branch manner, and the pure water conductivity and pH value monitor is connected to the high-level water tank through a pipeline.
Preferably, a water purifying device is installed on the high-level water tank and the pipeline.
Preferably, the high-level water tank is of a wine bottle type structure, and a breather valve is installed at a top air outlet.
Preferably, a flow differential pressure switch for alarming and protecting is arranged on a pipeline between the water inlet and the water outlet of the IGBT valve bank.
Preferably, the water-air heat exchange coolers are multiple, the water inlet end and the water outlet end of each two water-air heat exchange coolers which are connected in series are respectively connected to a pipeline between the cooling water main pump and the IGBT valve bank, the two ends of each water-air heat exchange cooler are respectively provided with a water inlet valve and a water outlet valve, and the pipeline between the cooling water main pump and the IGBT valve bank is provided with a normally closed valve which is connected with the water-air heat exchange coolers which are connected in series in pairs in parallel.
Preferably, the output pipeline of the water-air heat exchange cooler is branched and connected with a resin ion exchanger, and the resin ion exchanger is connected to the output pipeline of the high-level water tank through a pipeline.
A water cooling system of a high-voltage transmission line direct-current ice melting device adopting an IGBT module further comprises a DCS (distributed Control System) Control system, the DCS Control system is connected with an adjusting Control module and an alarm module, and is further connected with an interlocking protection Control module, a tripping protection Control module and a signal acquisition module, the adjusting Control module comprises a DPU (distributed Processing Unit) module, a PLC frequency adjusting module, a frequency converter module, a main pump rotating speed module, a flow and pressure module and a deviation calculating module which are sequentially connected, the deviation calculating module is connected with the DPU module, the deviation calculating module is further connected with a set flow and pressure module, the alarm module comprises an OR module, a DPU module and an alarm display module which are sequentially connected, or the modules input temperature signals, flow switch signals, pressure switch signals, water level signals, pH value signals, conductivity and flow analog quantity signals, the interlocking protection control module comprises a DPU module, a relay module and a linkage standby device which are sequentially connected, a linkage signal is input into the DPU module, the tripping protection control module comprises an OR module, a DPU module, a relay module and a disconnecting ice melting device module disconnecting link which are sequentially connected, or a temperature signal and two AND modules are input into the DPU module, one of the two AND modules inputs a conductivity signal and a pH value signal, the other one of the two AND modules inputs a pressure signal and is connected with a two-out-of-three module, and the two-out-of-three module inputs three flow meter signals.
A control method for a water cooling system of a high-voltage transmission line direct-current ice melting device adopting an IGBT module comprises the following steps:
(1) normal operation and monitoring of the water cooling system: clicking a starting button of the water cooling system, accelerating the water cooling pump to an initial operation frequency at a set speed, monitoring each parameter in the operation of the water cooling system in real time by the DCS control system in the starting operation of the water cooling system, and sending an alarm signal and actuating a corresponding interlocking control module when the parameter to be monitored in the water cooling system is lower than a set value;
(2) temperature, flow and pressure regulation under different load working conditions: the water cooling system can set water inlet parameters (temperature, flow and pressure) of the IGBT valve set according to the actual heat productivity of the ice melting device, and the temperature, the flow and the pressure of the water cooling system can be tracked. When the actual temperature, flow and pressure of the system deviate from the set parameter (temperature, flow and pressure), the deviation value is sent to a DPU (data processing unit) module for PID (proportion integration differentiation) operation, and the DPU module outputs a motor frequency increase and decrease instruction according to the positive deviation condition and the negative deviation condition, so that various set parameters (temperature, flow and pressure) of the water cooling system are changed by changing the power of the water cooling motor;
(3) trip protection working condition of the water cooling system: and after the water cooling system fails, the ice melting device needs to be immediately shut down, and the safety of equipment is protected. If the water inlet temperature and the water outlet temperature of the IGBT valve bank are higher than a set value or the electric conductivity of the cooling water is lower than a set value, the DPU module immediately outputs a trip signal to stop the operation of the ice melting device.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
(1) the invention overcomes the problems of communication fault, abnormal instrument, frequent water leakage, damaged valve pump body, unqualified water quality and the like which are easy to occur in the existing water cooling device, and simultaneously adds partial equipment and logic functions, so that the system has the advantages of high reliability (for example, the possibility of equipment misoperation is reduced by taking two out of three trip signals), strong adaptability, high automation degree and the like during the work;
(2) the invention adds an electric heating device and corresponding start-stop logic. The method has the advantages that the electric heating device is adopted, and then the cooling medium can be free from adding the antifreezing agent (the adding of the antifreezing agent into the pure water can affect the water quality and the water purification resin and is not beneficial to the long-term stable operation of the ice melting device). Secondly, when the IGBT valve bank or other high-voltage equipment is affected with damp and unqualified edges, the electric heating device can be started to improve the water temperature, and the effects of baking and improving insulation are achieved. And high automation degree. When the temperature T1 is lower than the combined starting set value, the heaters H1 and H2 are combined and started; when the temperature T2 is higher than the linkage set value, the heaters H1 and H2 are linked and stopped. When the water level switch L1 is actuated, the electric heaters H1 and H2 are connected.
(3) The cooling water pH value on-line instrument monitors the corrosion condition of cooling water on equipment, and the corrosion of the cooling water on the IGBT converter valve group can be effectively reduced by monitoring the cooling water pH value or inversely calculating the cooling water pH value according to the conductivity;
(4) adopts a wine bottle type high-level water tank, and a breather valve is arranged at an exhaust port. The high-level water tank can raise the initial pressure of water pump inlet and prevent pump cavitation, and the breather valve can isolate the interior of the tank from atmosphere in a certain pressure range, and can be communicated with atmosphere when the pressure is over or under said pressure range, at the same time can prevent storage tank from being damaged due to overpressure or vacuum. The bottleneck design of the high-level water tank can further reduce the contact of pure water and air, and greatly slow down the deterioration speed of the index of the pure water;
(5) the DCS distributed control system is adopted, the structure is open, the expandability is high, the advantages of the relay and the PLC are comprehensively utilized while the DPU is fully utilized, and the functions of monitoring, adjusting, alarming, protecting and the like of the cooling device are realized in a mode of combining analog quantity and switching value.
In summary, the following steps: the ice melting device water cooling system and the control method thereof have the advantages of compact structure, reasonable flow, convenient use, less maintenance amount and good stability, and can save electric energy in non-ice melting seasons and low-load ice melting working conditions. The ice melting device and the water cooling system are protected and controlled from the ice melting device, the water cooling system, the IGBT valve bank, the pump and other parts, the system is complete, monitoring and alarming are integrated with multiple information, the control system can be prevented from being mistakenly operated and refused to operate, equipment and parts are prevented from being damaged, the ice melting device is prevented from being influenced, and the influence of ice disasters on life and production of people is further enlarged. Meanwhile, the system conforms to the technical development trend, and is convenient for realizing intelligent development modes such as data remote transmission and system remote control in the later period. Besides being applied to an IGBT ice melting device, the invention can be applied to cooling water of systems such as ultrahigh-voltage and ultrahigh-voltage converter station converter valve groups, SVG reactive power compensators and the like based on IGBT modules, so the technology has wide popularization prospect.
Drawings
FIG. 1 is a schematic view of a water cooling system of a first conventional ice melting device;
FIG. 2 is a schematic view of a water cooling system of a second conventional ice melting device;
FIG. 3 is a schematic view of a water cooling system of the ice melting apparatus of the present invention;
FIG. 4 is a DCS control schematic according to the present invention;
FIG. 5 is a schematic diagram of an alarm module;
FIG. 6 is a schematic diagram of a regulation control module;
FIG. 7 is a schematic diagram of an interlock protection module;
fig. 8 is a schematic diagram of a trip protection module.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in figures 3-8, a water cooling system of a high-voltage transmission line direct-current ice melting device adopting an IGBT module comprises a high-level water tank, a cooling water main pump B1, a water-air heat exchange cooler and an IGBT valve bank, wherein a temperature transmitter T5 is installed at the output end of the high-level water tank, four liquid level sensors (liquid level switches) with different heights are installed on the side surface of the high-level water tank, namely a liquid level sensor L1, a liquid level sensor L2, a liquid level sensor L3 and a liquid level sensor L4, the high-level water tank is connected to the cooling water main pump through a pipeline, the cooling water main pump is connected to the IGBT valve bank through a pipeline, the water-air heat exchange cooler is installed on a pipeline between the cooling water main pump and the IGBT valve bank, a water return pipe for cooling the IGBT valve bank is connected to the high-level water tank, a motor, The speed is controllable, the cooling water temperature can be automatically adjusted along with the heating condition of the IGBT, the energy-saving effect is obvious, a cooling water main pump B1 is connected with a standby main pump B2 in parallel, a filter screen W1 is arranged at the water inlet end of the cooling water main pump B1, the cooling water main pump B1 and the filter screen W1 are respectively connected with a differential pressure switch PS3 and a differential pressure switch PS1 in parallel, a pressure transmitter P1 is arranged at the water outlet end of the cooling water main pump B1, a filter screen W2 is arranged at the water inlet end of the standby main pump B2, a differential pressure switch PS4 and a differential pressure switch PS2 are respectively connected with the standby main pump B2 and the filter screen W2 in parallel, a pressure transmitter P2 is arranged at the water outlet end of the standby main pump B2, valves are respectively arranged at the water outlet ends of the pressure transmitter P1 and the pressure P2, valves are respectively arranged at the water inlet ends of the filter screen W1 and the filter screen W2.
Preferably, an electric heating device and corresponding start and stop logics are added in the high-level water tank. Has the advantages that: the electric heating device is adopted, and then an antifreezing agent is not added into a cooling medium (the antifreezing agent added into pure water can affect the water quality and the water purification resin and is not beneficial to the long-term stable operation of the ice melting device). Secondly, when the IGBT valve bank or other high-voltage equipment is affected with damp and unqualified edges, the electric heating device can be started to improve the water temperature, and the effects of baking and improving insulation are achieved. And high automation degree. When the temperature T1 is lower than the combined starting set value, the heaters H1 and H2 are combined and started; when the temperature T2 is higher than the linkage set value, the heaters H1 and H2 are linked and stopped. When the water level switch L1 is actuated, the electric heaters H1 and H2 are connected.
Preferably, a pore plate flowmeter V1 is installed on the pipeline between the cooling water main pump and the IGBT valve group, a differential pressure transmitter F1 is connected in parallel to the pore plate flowmeter V1, a filter screen W3 is installed between the pore plate flowmeter and the IGBT valve group, a differential pressure switch PS9 is connected in parallel to the filter screen W3, a temperature transmitter T3 and a pressure transmitter P4 are installed at the inlet and outlet ends of the filter screen W3 respectively, a temperature transmitter T4 is installed at the output end of the IGBT valve group, the output end of the IGBT valve group is further connected to one end of a differential pressure switch PS5, a differential pressure switch PS6, a differential pressure switch PS7 and a differential pressure switch PS8 which are connected in parallel, the other end of the differential pressure switch PS5, the differential pressure switch PS6, the differential pressure switch PS7 and the differential pressure switch PS 8.
Preferably, the output pipeline of the water-air heat exchange cooler is connected with pure water conductivity (CC1 and CC2) and a pH value monitor (PH1) in a branch manner, the pure water conductivity is two, namely the pure water conductivity CC1 and the pure water conductivity CC2, the pure water conductivity CC1, the pure water conductivity CC2 and the pH value monitor are connected to the high-level water tank in parallel through pipelines, valves are installed at two ends of the pH value monitor (PH1), a cooling water pH value online instrument is used for monitoring corrosion of cooling water to equipment, monitoring of the pH value of the cooling water is increased, or the pH value of the cooling water is inversely calculated according to the conductivity, so that corrosion of the cooling water to the IGBT converter valve group can be effectively reduced.
Preferably, the high-level water tank is provided with a water purifying device Z on a pipeline, the output end of the water purifying device Z is provided with an electromagnetic valve D1, and the input end of the water purifying device Z is connected to external tap water.
Preferably, the high-level water tank is of a wine bottle type structure, a breather valve is installed at a top air outlet, the high-level water tank is of a wine bottle type, and the breather valve is installed at an air outlet. The high-level water tank can raise the initial pressure of water pump inlet and prevent pump cavitation, and the breather valve can isolate the interior of the tank from atmosphere in a certain pressure range, and can be communicated with atmosphere when the pressure is over or under said pressure range, at the same time can prevent storage tank from being damaged due to overpressure or vacuum. The bottleneck design of the high-level water tank can further reduce the contact of pure water and air, and greatly slow down the deterioration speed of the index of the pure water.
Preferably, the water-air heat exchange coolers are multiple, the water inlet end and the water outlet end of each two water-air heat exchange coolers which are connected in series are respectively connected to a pipeline between the cooling water main pump and the IGBT valve bank, the two ends of each water-air heat exchange cooler are respectively provided with a water inlet valve and a water outlet valve, and the pipeline between the cooling water main pump and the IGBT valve bank is provided with a normally closed valve which is connected with the water-air heat exchange coolers which are connected in series in pairs in parallel.
Preferably, the output pipeline of the water-air heat exchange cooler is branched and connected with a resin ion exchanger C1, the resin ion exchanger C1 is connected to the output pipeline of the high-level water tank through a pipeline, the input end of the resin ion exchanger C1 is provided with an electromagnetic valve D2, the output end of the electromagnetic valve D2 is sequentially connected with a filter screen W4 and a flow pore plate V2, the filter screen W4 and the flow pore plate V2 are respectively connected with a differential pressure switch PS10 and a differential pressure transmitter F2 in parallel, and the output end of the flow pore plate V2.
The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module further comprises a DCS control system, the DCS control system is connected with an adjusting control module and an alarm module, and is further connected with an interlocking protection control module, a tripping protection control module and a signal acquisition module, the adjusting control module comprises a DPU module, a PLC frequency adjusting module, a frequency converter module, a main pump rotating speed module, a flow and pressure module and a deviation calculation module which are sequentially connected, the deviation calculation module is connected to the DPU module, the deviation calculation module is further connected with a set flow and pressure module, the alarm module comprises an OR module, a DPU module and an alarm display module which are sequentially connected, or the modules input temperature signals, flow switch signals, pressure switch signals, water level signals, pH value signals, conductivity and flow analog quantity signals, the interlocking protection control module comprises the DPU module, the alarm module, the system comprises a relay module and a linkage standby device, a linkage signal is input into a DPU module, a trip protection control module comprises an OR module, the DPU module, the relay module and a disconnecting ice melting device module disconnecting link which are sequentially connected, a temperature signal and two AND modules are input into the OR module, one of the modules inputs a conductivity signal and a pH value signal into the module, the other module inputs a pressure signal and is connected with a two-out-of-three module, the two-out-of-three module inputs three flow meter signals, a DCS distributed control system is adopted, the structure is open, the expandability is strong, the relay and the PLC control advantages are comprehensively utilized while the DPU is fully utilized, and the functions of monitoring, adjusting, alarming, protecting and the like of the cooling device are realized in a mode of combining analog quantity and switching quantity.
Example 2: a control method for a water cooling system of a high-voltage transmission line direct-current ice melting device adopting an IGBT module comprises the following steps:
(1) normal operation and monitoring of the water cooling system: clicking a starting button of the water cooling system, accelerating the water cooling pump to an initial operation frequency at a set speed, monitoring each parameter in the operation of the water cooling system in real time by the DCS control system in the starting operation of the water cooling system, and sending an alarm signal and actuating a corresponding interlocking control module when the parameter to be monitored in the water cooling system is lower than a set value;
(2) temperature, flow and pressure regulation under different load working conditions: the water cooling system can set water inlet parameters (temperature, flow and pressure) of the IGBT valve set according to the actual heat productivity of the ice melting device, and the temperature, the flow and the pressure of the water cooling system can be tracked. When the actual temperature, flow and pressure of the system deviate from the set parameter (temperature, flow and pressure), the deviation value is sent to a DPU (data processing unit) module for PID (proportion integration differentiation) operation, and the DPU module outputs a motor frequency increase and decrease instruction according to the positive deviation condition and the negative deviation condition, so that various set parameters (temperature, flow and pressure) of the water cooling system are changed by changing the power of the water cooling motor;
(3) trip protection working condition of the water cooling system: and after the water cooling system fails, the ice melting device needs to be immediately shut down, and the safety of equipment is protected. If the water inlet temperature and the water outlet temperature of the IGBT valve bank are higher than a set value or the electric conductivity of the cooling water is lower than a set value, the DPU module immediately outputs a trip signal to stop the operation of the ice melting device.
Linkage signal in fig. 7: (1) when the water level (L1) is operated, the electric heaters H1 and H2 are connected, and the main pump is simultaneously shut down and operated;
(2) the water level (L4) acts to jointly stop the water purifying device Z and simultaneously connect the electromagnetic valve D1;
(3) operating the pump pressure switch (PS3/PS4) to be lower than a set value, and starting the standby main pump in a combined way corresponding to the lower and fixed outlet pressures (P1/P2);
(4) the pressure switch (PS5) is lower than the set value, and the flow (F1) is low, and the standby main pump is started in parallel;
(5) the temperature (T1) is low, and the heaters H1 and H2 are started in a combined mode; when the temperature (T2) is high, the heaters H1 and H2 are stopped in a combined mode, the temperature (T2) > is a fixed value of 4, and all heat exchangers are put into use;
(6) the temperature (T2) > constant value 1, a group of CW4 is put in, the temperature (T2) > constant value 2, a group of CW3 is put in, the temperature (T2) > constant value 3 is put in, a group of CW2 is put in, the temperature (T2) > constant value 4 is put in, and all the heat exchangers are put in; the exit logic is the opposite; t1< T2< T3< T4.
(7) The main pump is operated to trip (B1/B2), and the standby main pump is started in series (B1/B2).
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (10)
1. The utility model provides an adopt water cooling system of high tension transmission line direct current ice-melt device of IGBT module which characterized in that: including high flush tank, cooling water main pump, water wind heat transfer cooler and IGBT valves, high flush tank passes through pipe connection to the cooling water main pump, and the cooling water main pump passes through pipe connection to IGBT valves, and water wind heat transfer cooler installs on the pipeline between cooling water main pump and IGBT valves, and the IGBT valves passes through pipe connection to high flush tank, and the motor of cooling water main pump adopts frequency conversion drive mode.
2. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: the high-level water tank is of a wine bottle type structure, and a breather valve is installed at a gas outlet at the top end of the high-level water tank.
3. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: an electric heating device is arranged in the high-level water tank.
4. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: the high-level water tank is provided with a water purifying device for supplementing water.
5. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: an orifice plate flowmeter is arranged on a pipeline between the cooling water main pump and the IGBT valve bank; and a flow differential pressure switch for alarming and protecting is arranged on a pipeline between the water inlet and the water outlet of the IGBT valve bank.
6. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: the water-air heat exchange cooler output pipeline is connected with a pure water conductivity and pH value monitor in a branch manner, and the pure water conductivity and pH value monitor is connected to the high-level water tank through a pipeline.
7. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: the water-air heat exchange coolers are multiple, a water inlet end and a water outlet end of each water inlet and outlet end of each water outlet are connected to a pipeline between the cooling water main pump and the IGBT valve group respectively, and normally closed valves which are connected with the water-air heat exchange coolers which are connected in series in pairs are installed on the pipelines between the cooling water main pumps and the IGBT valve groups in parallel.
8. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: the branch of the output pipeline of the water-air heat exchange cooler is connected with a resin ion exchanger, and the resin ion exchanger is connected to the output pipeline of the high-level water tank through a pipeline.
9. The water cooling system of the high-voltage transmission line direct-current ice melting device adopting the IGBT module as claimed in claim 1, characterized in that: the intelligent control system also comprises a DCS control system, the DCS control system is connected with a signal acquisition module, an adjusting control module, an alarm module, an interlocking protection module and a tripping protection module, the adjusting control module comprises a DPU module, a PLC frequency adjusting module, a frequency converter module, a main pump rotating speed module, a flow and pressure module and a deviation calculation module which are connected in sequence, the deviation calculation module is connected to the DPU module, the deviation calculation module is also connected with a set flow and pressure module, the alarm module comprises an OR module, a DPU module and an alarm display module which are connected in sequence, the OR module inputs a temperature signal, a flow switch signal, a pressure switch signal, a water level signal, a pH value signal, a conductivity and a flow analog quantity signal, the interlocking protection control module comprises a DPU module, a relay module and a linkage standby device which are connected in sequence, and the DPU module, the trip protection control module comprises an OR module, a DPU module, a relay module and a disconnecting ice melting device module disconnecting link which are sequentially connected, wherein a temperature signal and two AND modules are input into the OR module, one of the two AND modules inputs a conductivity signal and a pH value signal, the other one of the two AND modules inputs a pressure signal and is connected with a two-out-of-three module, and the two-out-of-three module inputs three flow meter signals.
10. The control method of the water cooling system of the direct-current ice melting device for the high-voltage transmission line adopting the IGBT module according to any one of claims 1 to 9, characterized by comprising the following steps: the method comprises the following steps:
normal operation and monitoring of the water cooling system: clicking a starting button of the water cooling system, accelerating the water cooling pump to an initial operation frequency at a set speed, monitoring each parameter in the operation of the water cooling system in real time by the DCS control system in the starting operation of the water cooling system, and sending an alarm signal and actuating a corresponding interlocking control module when the parameter to be monitored in the water cooling system is lower than a set value;
temperature, flow and pressure regulation under different load working conditions: the water cooling system can set water inlet parameters of the IGBT valve set according to the actual heat productivity of the ice melting device, the water inlet parameters comprise temperature, flow and pressure, when the actual temperature, flow and pressure of the system respectively deviate from the set parameter values, the deviation values are sent to the DPU module to carry out PID operation, and the DPU module outputs a motor frequency increasing and decreasing instruction according to positive and negative deviation conditions, so that various set parameters of the water cooling system are changed by changing the power of the water cooling motor;
trip protection working condition of the water cooling system: and immediately stopping the operation of the ice melting device after the water cooling system fails, namely, the water inlet temperature and the water outlet temperature of the IGBT valve bank are higher than a set value or the electric conductivity of the cooling water is lower than a set value, and the DPU module immediately outputs a trip signal to stop the operation of the ice melting device.
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| CN112268620A (en) * | 2020-09-08 | 2021-01-26 | 北京首钢自动化信息技术有限公司 | Cooling device and cooling method of infrared scanning temperature measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112268620A (en) * | 2020-09-08 | 2021-01-26 | 北京首钢自动化信息技术有限公司 | Cooling device and cooling method of infrared scanning temperature measurement system |
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