CN103115729A - Method and device for water leakage detection of high-voltage direct-current power transmission valve cooling system - Google Patents
Method and device for water leakage detection of high-voltage direct-current power transmission valve cooling system Download PDFInfo
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- CN103115729A CN103115729A CN2013100193122A CN201310019312A CN103115729A CN 103115729 A CN103115729 A CN 103115729A CN 2013100193122 A CN2013100193122 A CN 2013100193122A CN 201310019312 A CN201310019312 A CN 201310019312A CN 103115729 A CN103115729 A CN 103115729A
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Abstract
The invention discloses a method for water leakage detection of a high-voltage direct-current power transmission valve cooling system. The method includes the following steps: S1. detecting the water level of an expansion tank periodically and saving the water level; S2. calculating the fall speed of the water level of the expansion tank according to the saved water level and the period of the expansion tank; S3. comparing the fall speed of the water level of the expansion tank and a preset threshold value of the fall speed of the water level, and giving a leakage alarm signal when the fall speed of the water level is larger than the threshold value of the fall speed of the water level. The invention further discloses a device for water leakage detection of a high-voltage direct-current power transmission valve cooling system. The device comprises a water level detection module, a calculation module, a comparison module and an alarm module. By means of the technical scheme, water leakage can be detected and alarm can be given when a very small amount of leakage of the high-voltage direct-current power transmission valve cooling system happens.
Description
Technical field
The present invention relates to a kind of valve cooling system of HVDC (High Voltage Direct Current) transmission system, particularly leak detection method and device of a kind of valve cooling system.
Background technology
The voltage direct-current transmission valve cooling system is most important backup system in high voltage direct current transmission project, and transverter adopts the water-cooled pattern at present.Because voltage direct-current transmission valve cooling system cooling circuit is complicated, element is many, and vibrations are large, so the situation of easily leaking.Simultaneously, patrol and examine passage from equipment away from, the visual angle is not good, the part loop is the visual angle blind spot, adds that the water that spills is transparent, water droplet is little, so be difficult to observe the situation of leaking.Therefore, water leakage detecting function just seems very important.
The voltage direct-current transmission valve cooling system leaks and detects the water leakage detecting function that comprises valve tower leakage inspector and control system.Valve tower leakage inspector collects by valve tower screen layer the water of coming, and sends alarm or tripping operation according to water leakage and the speed of leaking.The water leakage detecting function of control system sends alarm according to water level, small pump startup situation and the moisturizing time of expansion tank.
The detection of leaking of present control system is provided with three alarm criterions, is respectively small pump number of starts criterion, moisturizing time criterion and water level alarm criterion.
When normal operation, voltage direct-current transmission valve cooling system expansion tank water level is all more than 45%, and due to moisture evaporation or water sampling, the expansion water level has slightly and descends.When the expansion water level dropped to 30%, small pump can start automatically, the expansion water level is mended 35% rear small pump automatically stop.If at short notice, small pump has started twice, so just illustrating that the expansion water level descends in the short time surpasses 10%, that is to say and occured to leak (speed of leaking 0.057L/min＜x＜19.943L/min), because moisture evaporation or water sampling can not cause under the expansion water level so much.The speed of leaking is larger, and the time interval that small pump starts is just shorter, namely starts more frequent.Small pump starts twice in 9990s, and control system is just thought and sent the alarm of leaking by the small pump frequent starting.
When the expansion water level dropped to 30%, small pump can start automatically, and the speed of leaking very large (speed of leaking is greater than 17.625L/min) just needs the long period expansion water level could be mended 35%.Equation expression is
Wherein t is the moisturizing time, and v is rate of water make-up, and s1 is moisturizing speed, and s2 is the speed of leaking.Rate of water make-up v is 5% invariable, and moisturizing speed s1 is also invariable under normal condition (power supply is normal, moisturizing loop normal), and moisturizing time t is inversely proportional to the speed s2 that leaks so, and the speed of leaking in other words is larger, and the moisturizing time is just longer.If the moisturizing time, just explanation was leaked greater than the normal moisturizing time.Small pump continuously operation surpasses 240s, and control system is just thought the moisturizing overlong time, sends the alarm of leaking.
When the expansion water level dropped to 30%, small pump can start automatically, and the water level that expands under normal circumstances can be lower than 30%.The situation of leaking occurs, do not start (small pump fault or control loop fault) or leak in a large number but small pump is normal, just might occur lower than 30%., illustrate certainly to exist and leak lower than 25% when the expansion tank water level, control system is sent the alarm of leaking.
existing control system is leaked and is detected by above-mentioned three criterions of leaking are set, the situation of can checkout equipment leaking and send the alarm of leaking, but equipment leak not too large in, very possible three criterions do not satisfy, as due to small pump moisturizing speed always greater than the speed of leaking, the water level of expansion tank maintains more than 30% always, the time of its moisturizing simultaneously is also no longer than the moisturizing time criterion that arranges, and small pump has only started once in the given time, although namely occured to leak, but but do not satisfy above-mentioned all criterions, control system is not sent the alarm of leaking.But do not send the situation of alarm although just occur repeatedly leaking in existing valve cooling system, the situation of leaking that has waits until that even maintenance process just finds.This is all very unfavorable to equipment, service work.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, a kind of voltage direct-current transmission valve cooling system detection method of leaking is provided, comprise the steps:
S1: periodically detect the water level of expansion tank, and preserve this water level;
S2: according to water level and the cycle of the expansion tank of described preservation, calculate the water level decline rate of expansion tank;
S3: relatively the water level decline rate of expansion tank and default water level decline rate threshold value, during greater than water level decline rate threshold value, send the alarm signal of leaking when the water level decline rate.
The present invention also provides a kind of voltage direct-current transmission valve cooling system leakage inspector, comprises water level detecting module, computing module, comparison module and alarm module:
Water level detecting module: be used for periodically detecting the water level of expansion tank, and this water level is sent to the computing module preservation;
Computing module: for the water level that detects according to described water level detecting module, calculate the water level decline rate of expansion tank, and result of calculation is sent to comparison module;
Comparison module: be used for relatively water level decline rate and the default water level decline rate threshold value of expansion tank,, send and leak alarm signal to alarm module during greater than water level decline rate threshold value when the water level decline rate;
Alarm module: after receiving described alarm signal, send warning information.
Voltage direct-current transmission valve cooling system provided by the invention leak detection method and device, by expansion tank water level decline rate criterion is set, and periodically detect the water level of expansion tank, calculate the water level decline rate of expansion tank, when the water level decline rate of expansion tank surpasses expansion tank water level decline rate criterion, send the warning information that leaks.Voltage direct-current transmission valve cooling system of the present invention leaks, and it doesn't matter for the duty of detection method and device and small pump, can by suitable water level decline rate criterion and sense cycle are set, reach the purpose of timely detection.Can when very little leaking occur the voltage direct-current transmission valve cooling system, just detect the situation of leaking, and produce alarm.Technical scheme of the present invention can successfully be made the situation of leaking of valve cooling system and detect and send alarm through many experiments.
Description of drawings
Fig. 1 is the leak process flow diagram of detection method of a kind of voltage direct-current transmission valve cooling system of the present invention;
Fig. 2 is the structural representation of a kind of voltage direct-current transmission valve cooling system of the present invention leakage inspector;
Fig. 3 is the structural representation of a kind of voltage direct-current transmission valve cooling system of the present invention leakage inspector preferred version;
Fig. 4 is the structural representation of another preferred version of a kind of voltage direct-current transmission valve cooling system of the present invention leakage inspector.
Embodiment
In prior art, the detection criteria although set-up of control system leaks, but equipment leak not too large in, still the situation of leaking can not be detected and send the alarm of leaking, voltage direct-current transmission valve cooling system provided by the invention leak detection method and the device by expansion tank water level decline rate criterion is set, and periodically detect the water level of expansion tank, calculate the water level decline rate of expansion tank, when the water level decline rate of expansion tank surpasses expansion tank water level decline rate criterion, send the warning information that leaks.Voltage direct-current transmission valve cooling system of the present invention leaks, and it doesn't matter for the duty of detection method and device and small pump, can by suitable water level decline rate criterion and sense cycle are set, reach the purpose of timely detection.Can when very little leaking occur the voltage direct-current transmission valve cooling system, just detect the situation of leaking, and produce alarm.Device of the present invention can be arranged on separately on voltage direct-current transmission valve cooling system control system, with detection that valve cooling system is leaked, also can on prior art arranges criterion basis, set up voltage direct-current transmission valve cooling system leakage inspector of the present invention.Technical scheme of the present invention can successfully be made the situation of leaking of voltage direct-current transmission valve cooling system and detect and send alarm through many experiments.
The present invention is described in detail below in conjunction with accompanying drawing.
Embodiment 1:
Be illustrated in figure 1 as the leak process flow diagram of detection method of a kind of voltage direct-current transmission valve cooling system of the present invention, comprise the steps:
S1: periodically detect the water level of expansion tank, and preserve this water level;
Periodically detect the water level of expansion tank, can carry out in accordance with the following steps:
S11: the water level that expansion tank detected at moment t1 is v1, preserves this water level;
S12: be v2 through the water level at moment t2 detection expansion tank after cycle t, preserve this water level;
S13: every cycle t repeated execution of steps S11, S12 of crossing.
S2: according to water level and the cycle of the expansion tank of described preservation, calculate the water level decline rate of expansion tank;
The water level of t1 expansion tank is v1 detect constantly through step S11 and S12, after the water level of t2 expansion tank is v2 constantly, first compare the size of v1 and v2, when v1 is not less than v2, the water level that expansion tank is described has descended, and calculates the water level decline rate of expansion tank according to following formula: v=(v1-v2)/t; Wherein, v is expansion tank water level decline rate;
During less than v2, explanation small pump this moment is just in moisturizing as v1, and water level can not calculate expansion tank water level decline rate rising.
S3: relatively the water level decline rate of expansion tank and default water level decline rate threshold value, during greater than water level decline rate threshold value, send the alarm signal of leaking when the water level decline rate.
In above-mentioned valve cooling system leaked detection method, it was 0.3%L/1800s that expansion tank water level decline rate threshold value is set, and the cycle is 1800s, and wherein, L is the volume of expansion tank.The situation of like this can be at the right time leaking with the equipment that detects of sensitivity also sends alarm signal.
As a kind of preferred embodiment, in the arbitrary steps of above-mentioned valve cooling system detection method, all carry out simultaneously following steps: detect main pump and whether be in starting state or switching state always, when main pump being detected and be in starting state or switching state, do not detect the water level of expansion tank in one-period.
Due to start at main pump, when switching, inner cold water is compressed, the water level of expansion tank generally has 2% variation, changing size has relation with the inner cold water air content.The inner cold water air content is higher, and main pump starts, when switching, the expansion tank SEA LEVEL VARIATION is larger.When the main pump startup, when switching, satisfy expansion tank water level decline rate greater than the water level decline rate threshold value that arranges, control system can be sent the alarm of leaking, but do not leak this moment.General main pump is enabled in 4s to be completed, main pump switches in 2s and completes, so whether be in startup or switching state by detecting main pump, when it is in startup or switching state, by suspend the method for examinations in one-period, can avoid the wrong situation of sending out the alarm of leaking of control system to occur.
As leak another preferred embodiment of the method that detects of a kind of voltage direct-current transmission valve cooling system of the present invention, in the process of carrying out above-mentioned steps, also comprise and carry out constantly following steps: detect the inner cold water leaving water temperature, during greater than default temperature variation threshold value, do not detect the water level of expansion tank when the changing value that described leaving water temperature detected in one-period.
Because HVDC (High Voltage Direct Current) transmission system power is adjusted, voltage direct-current transmission valve cooling system leaving water temperature also and then changes, and the inner cold water volume also can change.Volumetric expansion is calculated formula after simplifying, and pure water expanding volume computing formula is v
2=v
1[1+ α (t
2-t
1)], in formula, v1 is the volume in the time of t1 ℃, and v2 is the volume in the time of t2 ℃, and α gets 2.08 * 10^-4.(except below 4 ℃) as calculated, the every rising of inner cold water temperature or descend 1 ℃, the inner cold water volume increases or reduces approximately 2 liters, and namely the expansion tank water level rises or approximately 1% (the expansion tank volume is 190 liters) that descend.1 ℃ of the every decline of inner cold water temperature is satisfied expansion tank water level decline rate greater than water level decline rate threshold value, and control system can be sent out the alarm signal of leaking by mistake.By detecting the inner cold water leaving water temperature, during greater than default temperature variation threshold value, suspend the water level that detects expansion tank in one-period when the changing value that described leaving water temperature detected.In 900s, the inner cold water leaving water temperature descends and can obtain a detection signal when surpassing 0.5 ℃, is the 1800s pulse signal with this signal extension, then removes the detecting step that leaks.So just can prevent that the control system mistake is sent out the alarm signal of leaking when the inner cold water leaving water temperature changes.
Embodiment 2:
The structural representation of a kind of voltage direct-current transmission valve cooling system of the present invention as shown in Figure 2 leakage inspector, this device can be implemented the method for embodiment 1, comprises water level detecting module 1, computing module 2, comparison module 3 and alarm module 4:
Water level detecting module 1: be used for periodically detecting the water level of expansion tank, and this water level is sent to computing module 2 preservations;
The process of the water level of water level detecting module 1 detection expansion tank is as follows:
The water level that expansion tank detected at moment t1 is v1, and is sent to computing module 2 preservations;
Be v2 through the water level at moment t2 detection expansion tank after cycle t, be sent to computing module 2 and preserve;
Every cycle t that crosses repeats said process.
Computing module 2: for the water level that detects according to described water level detecting module 1, calculate the water level decline rate of expansion tank, and result of calculation is sent to comparison module 3;
Computing module 2 first compares the size of v1 and v2 before calculating expansion tank water level decline rate, when v1 is not less than v2, illustrate that the water level of expansion tank has descended, and calculates the water level decline rate of expansion tank according to following formula: v=(v1-v2)/t;
During less than v2, explanation small pump this moment is just in moisturizing as v1, and water level can not calculate expansion tank water level decline rate rising;
Wherein, v is expansion tank water level decline rate, the water level of expansion tank when v1 is moment t1, and the water level of expansion tank when v2 is moment t2, t is the cycle.
Comparison module 3: be used for relatively water level decline rate and the default water level decline rate threshold value of expansion tank,, send and leak alarm signal to alarm module 4 during greater than water level decline rate threshold value when the water level decline rate;
Default expansion tank water level decline rate threshold value is 0.3%L/1800s, and the cycle is 1800s, and wherein, L is the volume of expansion tank.The situation of like this can be at the right time leaking with the equipment that detects of sensitivity also sends alarm signal.
Alarm module 4: after receiving described alarm signal, send warning information.
Embodiment 3:
Be illustrated in figure 3 as the preferred version embodiment of a kind of voltage direct-current transmission valve cooling system of the present invention leakage inspector, as shown in Figure 3, it is to set up main pump state detection module 5 on the basis of the technical scheme of embodiment 2, main pump state detection module 5 detects constantly main pump and whether is in starting state or switching state, when main pump being detected and be in starting state or switching state, control water level detecting module 1 and do not detect the water level of expansion tank in one-period.
Due to start at main pump, when switching, inner cold water is compressed, the water level of expansion tank generally has 2% variation, changing size has relation with the inner cold water air content.The inner cold water air content is higher, and main pump starts, when switching, the expansion tank SEA LEVEL VARIATION is larger.When the main pump startup, when switching, satisfy expansion tank water level decline rate greater than the water level decline rate threshold value that arranges, control system can be sent the alarm of leaking, but do not leak this moment.General main pump is enabled in 4s to be completed, main pump switches in 2s and completes, so whether be in startup or switching state by detecting main pump, when it is in startup or switching state, by suspend the method for examinations in one-period, can avoid the wrong situation of sending out the alarm of leaking of control system to occur.
Embodiment 4:
Be illustrated in figure 4 as another preferred version embodiment of a kind of voltage direct-current transmission valve cooling system of the present invention leakage inspector, this preferred embodiment has increased leaving water temperature detection module 6, for detection of leaving water temperature,, control water level detecting module 1 and do not detect the water level of expansion tank in one-period during greater than default temperature variation threshold value when the changing value that described leaving water temperature detected.
This leaving water temperature detection module 6 can increase on the technical scheme basis of embodiment 2, also can increase on the technical scheme of embodiment 3, can reach to prevent that leaving water temperature from changing the situation that causing the mistake alarm of leaking.For adding, formed a more excellent technical scheme as described in Figure 4 on the basis of the technical scheme of embodiment 3.
Because HVDC (High Voltage Direct Current) transmission system power is adjusted, voltage direct-current transmission valve cooling system leaving water temperature also and then changes, and the inner cold water volume also can change.Volumetric expansion is calculated formula after simplifying, and pure water expanding volume computing formula is v
2=v
1[1+ α (t
2-t
1)], in formula, v1 is the volume in the time of t1 ℃, and v2 is the volume in the time of t2 ℃, and α gets 2.08 * 10^-4.(except below 4 ℃) as calculated, the every rising of inner cold water temperature or descend 1 ℃, the inner cold water volume increases or reduces approximately 2 liters, and namely the expansion tank water level rises or approximately 1% (the expansion tank volume is 190 liters) that descend.1 ℃ of the every decline of inner cold water temperature is satisfied expansion tank water level decline rate greater than water level decline rate threshold value, and control system can be sent out the alarm signal of leaking by mistake.By detecting coolant-temperature gage, during greater than default temperature variation threshold value, suspend the water level that detects expansion tank in one-period when the changing value that described leaving water temperature detected.In 900s, the inner cold water leaving water temperature descends and can obtain a detection signal when surpassing 0.5 ℃, is the 1800s pulse signal with this signal extension, then the detection of going to leak.So just can prevent that the control system mistake is sent out the alarm signal of leaking when the inner cold water leaving water temperature changes.
Should be noted that at last; above content is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; the simple modification that those of ordinary skill in the art carries out technical scheme of the present invention or be equal to replacement does not all break away from essence and the scope of technical solution of the present invention.
Claims (13)
1. voltage direct-current transmission valve cooling system detection method of leaking, is characterized in that, comprises the following steps:
S1: periodically detect the water level of expansion tank, and preserve this water level;
S2: according to water level and the cycle of the expansion tank of described preservation, calculate the water level decline rate of expansion tank;
S3: relatively the water level decline rate of expansion tank and default water level decline rate threshold value, during greater than water level decline rate threshold value, send the alarm signal of leaking when the water level decline rate.
2. the voltage direct-current transmission valve cooling system according to claim 1 detection method of leaking, is characterized in that, described step S1 is specially:
S11: the water level that expansion tank detected at moment t1 is v1, preserves this water level;
S12: be v2 through the water level at moment t2 detection expansion tank after cycle t, preserve this water level;
S13: every cycle t repeated execution of steps S11, S12 of crossing.
3. the voltage direct-current transmission valve cooling system according to claim 2 detection method of leaking, is characterized in that, described step S2 is specially:
When v1 is not less than v2, calculate the water level decline rate of expansion tank according to following formula: v=(v1-v2)/t; Wherein, v is expansion tank water level decline rate;
During less than v2, do not calculate expansion tank water level decline rate as v1.
According to claim 1 to 3 arbitrary described voltage direct-current transmission valve cooling system detection method of leaking, it is characterized in that, described expansion tank water level decline rate threshold value is 0.3%L/1800s, wherein, L is the volume of expansion tank.
According to claim 1 to 3 arbitrary described voltage direct-current transmission valve cooling system detection method of leaking, it is characterized in that, further comprising the steps of: as to detect main pump and whether be in starting state or switching state, when main pump being detected and be in starting state or switching state, do not detect the water level of expansion tank in one-period.
6. the voltage direct-current transmission valve cooling system according to claim 5 detection method of leaking, it is characterized in that, also comprise the steps: to detect the inner cold water leaving water temperature, during greater than default temperature variation threshold value, do not detect the water level of expansion tank when the changing value that described leaving water temperature detected in one-period.
7. the voltage direct-current transmission valve cooling system according to claim 6 detection method of leaking, is characterized in that, described temperature variation threshold value is 0.5 ℃/900s, and the described cycle is 1800s.
8. a voltage direct-current transmission valve cooling system leakage inspector, is characterized in that, comprises water level detecting module, computing module, comparison module and alarm module:
Water level detecting module: be used for periodically detecting the water level of expansion tank, and this water level is sent to the computing module preservation;
Computing module: for the water level that detects according to described water level detecting module, calculate the water level decline rate of expansion tank, and result of calculation is sent to comparison module;
Comparison module: be used for relatively water level decline rate and the default water level decline rate threshold value of expansion tank,, send and leak alarm signal to alarm module during greater than water level decline rate threshold value when the water level decline rate;
Alarm module: after receiving described alarm signal, send warning information.
9. voltage direct-current transmission valve cooling system leakage inspector according to claim 8, it is characterized in that, also comprise the main pump state detection module, whether be in starting state or switching state for detection of main pump, when main pump being detected and be in starting state or switching state, control the water level detecting module and do not detect the water level of expansion tank in one-period.
10. according to claim 8 or 9 described voltage direct-current transmission valve cooling system leakage inspectors, it is characterized in that, also comprise the leaving water temperature detection module, for detection of the inner cold water leaving water temperature,, control the water level detecting module and do not detect the water level of expansion tank in one-period during greater than default temperature variation threshold value when the changing value that described leaving water temperature detected.
11. voltage direct-current transmission valve cooling system leakage inspector according to claim 10 is characterized in that, when v1 was not less than v2, computing module calculated the water level decline rate of expansion tank according to following formula: v=(v1-v2)/t;
During less than v2, computing module does not calculate expansion tank water level decline rate as v1;
Wherein, v is expansion tank water level decline rate, the water level of expansion tank when v1 is moment t1, and the water level of expansion tank when v2 is moment t2, t is the cycle.
12. voltage direct-current transmission valve cooling system leakage inspector according to claim 10 is characterized in that, described expansion tank water level decline rate threshold value is 0.3%L/1800s, and wherein, L is the volume of expansion tank.
13. valve cooling system leakage inspector according to claim 10 is characterized in that, described temperature variation threshold value is 0.5 ℃/900s, and the described cycle is 1800s.
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| CN103732138A (en) * | 2012-06-01 | 2014-04-16 | 株式会社东芝 | Cooling device for MRI device unit, and MRI device |
| CN103884473A (en) * | 2014-02-18 | 2014-06-25 | 北京国电富通科技发展有限责任公司 | Water leakage determination method for water cooling system |
| CN104614133A (en) * | 2014-12-31 | 2015-05-13 | 南车青岛四方机车车辆股份有限公司 | Leakage-proof detection method, system and device for railway vehicle water supply system |
| CN105834219A (en) * | 2016-05-05 | 2016-08-10 | 首钢京唐钢铁联合有限责任公司 | Rolling mill emulsion system water adding method and rolling mill emulsion system |
| CN108287006A (en) * | 2018-01-15 | 2018-07-17 | 中国南方电网有限责任公司超高压输电公司广州局 | The slight monitoring of leakage method of valve cooling system based on temperature-compensating and least square method |
| CN110207311A (en) * | 2019-06-18 | 2019-09-06 | 广东美的制冷设备有限公司 | Method for detecting leakage, air conditioner and computer readable storage medium |
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| CN103732138A (en) * | 2012-06-01 | 2014-04-16 | 株式会社东芝 | Cooling device for MRI device unit, and MRI device |
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| CN110207311A (en) * | 2019-06-18 | 2019-09-06 | 广东美的制冷设备有限公司 | Method for detecting leakage, air conditioner and computer readable storage medium |
| CN110542520A (en) * | 2019-09-29 | 2019-12-06 | 潍柴动力股份有限公司 | engine liquid leakage monitoring method and system |
| CN110542520B (en) * | 2019-09-29 | 2022-04-05 | 潍柴动力股份有限公司 | Engine liquid leakage monitoring method and system |
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