CN113432638A - Cable condensation state monitoring method - Google Patents
Cable condensation state monitoring method Download PDFInfo
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- CN113432638A CN113432638A CN202110552313.8A CN202110552313A CN113432638A CN 113432638 A CN113432638 A CN 113432638A CN 202110552313 A CN202110552313 A CN 202110552313A CN 113432638 A CN113432638 A CN 113432638A
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- temperature
- pressure value
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- 238000009833 condensation Methods 0.000 title claims abstract description 52
- 230000005494 condensation Effects 0.000 title claims abstract description 48
- 238000012544 monitoring process Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 24
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000013507 mapping Methods 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a method for monitoring a condensation state of a cable, which relates to the technical field of bridge inhaul cable pipe maintenance and comprises the following steps: receiving a temperature value and a relative humidity value collected by a sensor; acquiring a gas pressure value and a moisture content value according to the temperature value and the relative humidity value; acquiring a second saturated vapor pressure value according to the gas pressure value and the moisture content value; acquiring a condensation temperature value according to the second saturated vapor pressure value; and if the dew condensation temperature value is higher than or equal to the alarm temperature threshold value, judging that the dew condensation of the cable possibly occurs. The method provided by the invention can be used for monitoring the condensation state of the closed space structure in the cable in time so as to realize anti-condensation early warning.
Description
Technical Field
The invention relates to the technical field of bridge inhaul cable management, in particular to a method for monitoring a condensation state of a cable.
Background
The cable is one of the main bearing components of a part of bridges, the service life of the cable also determines the service life of the whole bridge, and the working environment of the cable is across rivers and seas, and the environment is relatively humid, so that the water and the temperature of the cable are most likely to cause cable corrosion, wherein the corrosion of two anchoring areas of the cable beam is most severe. Therefore, a protective cover is arranged on the outer side of the anchor backing plate at the anchoring end to reduce the influence of the external environment on the cable, but because the protective cover and the anchor backing plate form a closed space, when the protective cover reaches certain humidity, condensation is easy to occur in the protective cover at certain temperature to form dew condensation, so that the cable and the anchoring area are corroded, the cable has a plurality of closed space structures which are the same as the protective cover, such as a waterproof cover, a pre-buried pipe and the like, and the closed space structures also have similar situations.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for monitoring the condensation state of a cable, which can be used for monitoring the condensation state of a closed space structure in the cable in time so as to realize anti-condensation early warning.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of monitoring the condensation status of a cable, comprising the steps of:
receiving a temperature value and a relative humidity value collected by a sensor;
acquiring a gas pressure value and a moisture content value according to the temperature value and the relative humidity value;
acquiring a second saturated vapor pressure value according to the gas pressure value and the moisture content value;
acquiring a condensation temperature value according to the second saturated vapor pressure value;
and if the dew condensation temperature value is higher than or equal to the alarm temperature threshold value, judging that the dew condensation of the cable possibly occurs.
Further, according to the formula
Calculating the gas pressure value and moisture content value, wherein:
d: a moisture content value;
RH: a relative humidity value;
Pm: a first saturated vapor pressure value obtained from the temperature value;
p: the pressure of the gas.
Further, according to the formula
Calculating the second saturated vapor pressure value, wherein:
P0: a second saturated vapor pressure value;
p: the gas pressure;
d: moisture content values.
Compared with the prior art, the invention has the following beneficial effects:
1. the method for monitoring the condensation state of the cable can monitor the condensation state of the cable in time according to the temperature and relative humidity conditions of a closed space structure in the cable so as to realize anti-condensation early warning.
Drawings
Fig. 1 is a schematic structural diagram of a cable condensation state monitoring system according to an embodiment of the invention.
FIG. 2 is a schematic flow chart of a method for monitoring condensation state of a cable according to an embodiment of the present invention.
FIG. 3 is a table showing the relationship between the saturated vapor pressure and the temperature of water according to the embodiment of the present invention.
In the figure, 1-protective cover, 2-temperature and humidity sensor, 3-monitoring system.
Detailed Description
In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
Example one
Taking a cable protection cover as an example, fig. 1 is a schematic structural diagram of a cable condensation state monitoring system provided by the present invention. The system comprises a protective cover 1, a temperature and humidity sensor 2 and a monitoring system 3, wherein the protective cover 1 is installed on the outer side of an anchor backing plate and forms a closed space together with the anchor backing plate. Temperature and humidity sensor 2 installs in safety cover 1 for detect temperature and relative humidity information in the safety cover 1, and pass to monitoring system 3 with these information through the signal line, monitoring system 3 carries out the analysis to these information again, outputs early warning information.
Fig. 2 is a schematic flow chart of a method for monitoring a condensation state of a cable according to the present invention. As shown, the method comprises the following steps:
s101, receiving a temperature value and a relative humidity value collected by a sensor.
As shown in fig. 1, the sensor may be, for example, a temperature and humidity pressure sensor 2 shown in fig. 1, which is installed inside the protection cover 1 to detect the temperature and the relative humidity inside the protection cover 1, and in a specific implementation, the monitoring system 3 may receive the temperature value and the relative humidity value through a signal line.
S102, acquiring a gas pressure value and a moisture content value;
after the monitoring system 3 receives the temperature value and the relative humidity value inside the protection cover, the gas pressure value inside the protection cover 1 can be obtained through the formula (1):
in the formula: d: moisture content values.
RH: the relative humidity value,%, has already been obtained in step S101;
Pm: a first saturated vapor pressure value, Pa;
p: a gas pressure value, Pa;
in the closed condition, there is a certain mapping relationship between the saturated vapor pressure value of water and the temperature, as shown in fig. 3. The monitoring system 3 can obtain a corresponding first saturated vapor pressure value P according to the temperature value and the mapping relationship between the saturated vapor pressure value and the temperature of the watermThe above mapping relationship may be stored in the monitoring system 3 in advance.
The moisture content d in the sealed container is constant without the condensate water being diluted out. The monitoring system measures the temperature values T of the protection cover 1 at different times1And T2Obtaining the corresponding Pm1，Pm2，Recombination and temperature value T1And T2Corresponding relative humidity value RH1，RH2Substituting into formula (1) to obtain
Obtaining a gas pressure value P inside the protective cover 1, and substituting the gas pressure value P into a formula (1) to obtain a moisture content value d inside the protective cover 1;
when the relative humidity value RH is 100%, the water vapor is saturated and is at the standard atmospheric pressure, the gas pressure P is not required to be calculated, and the value P is 1.01 × 105Pa directly taken and substituted into the formula (1) to obtain the humidity content value d inside the protective cover.
S103, acquiring a second saturated vapor pressure value;
obtaining a second saturated vapor pressure value by equation (2)
In the formula: p0: a second saturated vapor pressure value, Pa;
p: the gas pressure value, obtained in step S102, Pa;
d: the moisture content value, has been acquired in step S102.
S104, acquiring a condensation temperature value;
the monitoring system 3 may obtain the corresponding condensation temperature value according to the second saturated vapor pressure value and a mapping relationship between the saturated vapor pressure value of the water and the temperature, where the temperature value corresponding to the second saturated vapor pressure value is the condensation temperature value, and the mapping relationship may be stored in the monitoring system 3 in advance.
S105, judging whether the dew condensation temperature value is higher than or equal to an alarm temperature threshold value, and if so, executing S106;
the alarm temperature threshold value represents a critical value of dew condensation, and the monitoring system 3 compares the dew condensation temperature value with the alarm temperature threshold value after acquiring the dew condensation temperature value. If the dew condensation temperature value is higher than or equal to the alarm temperature threshold value, the dew condensation temperature value exceeds a critical value of dew condensation in the protection cover, when the protection cover 1 is easy to condense in the protection cover 1 to form dew condensation when the air temperature is low, the monitoring system 3 can determine that the dew condensation is likely to occur in the protection cover, and S106 is executed. Otherwise, S108 is executed.
The alarm temperature threshold value can be set according to the minimum temperature of the area where the protective cover is located in the month, can also be adjusted according to the requirement, and is stored in the monitoring system 3.
And S106, determining that condensation is likely to occur.
And S107, outputting reminding information that condensation is possible.
After determining that the condensation of the protection cover 1 is likely to occur, the monitoring system 3 may generate reminding information that the condensation of the protection cover 1 is likely to occur, and output the reminding information. For example, the monitoring system 3 may output the prompting information to a related display device, such as a mobile phone of a person in charge or a voice broadcast installation value, so as to prompt the user to take related measures in time, pay attention to the dew condensation amount state and water accumulation information of the protective cover, and remove moisture in time, thereby preventing corrosion of the cable and the anchoring area.
And S108, determining that condensation is not likely to occur.
After the monitoring system 3 determines that the dew condensation of the protective cover 1 is unlikely to occur, no processing may be performed.
The method can also be used in other closed space structures of the cable, such as a waterproof cover, an embedded pipe and the like. In conclusion, the method provided by the invention can be used for monitoring the condensation state of the closed space structure in the cable in time according to the temperature and relative humidity conditions of the closed space structure in the cable, so as to realize the anti-condensation early warning.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (3)
1. A method for monitoring the condensation state of a cable, comprising the steps of:
receiving a temperature value and a relative humidity value collected by a sensor;
acquiring a gas pressure value and a moisture content value according to the temperature value and the relative humidity value;
acquiring a second saturated vapor pressure value according to the gas pressure value and the moisture content value;
acquiring a condensation temperature value according to the second saturated vapor pressure value;
and if the dew condensation temperature value is higher than or equal to the alarm temperature threshold value, judging that the dew condensation of the cable possibly occurs.
2. Method for monitoring the condensation status of a cable according to claim 1, characterized in that it is carried out according to the formula
Calculating the gas pressure value and moisture content value, wherein:
d: a moisture content value;
RH: a relative humidity value;
Pm: a first saturated vapor pressure value obtained from the temperature value;
p: a gas pressure value.
3. Method for monitoring the condensation status of a cable according to claim 1, characterized in that it is carried out according to the formula
Calculating the second saturated vapor pressure value, wherein:
P0: a second saturated vapor pressure value;
p: a gas pressure value;
d: moisture content values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110552313.8A CN113432638A (en) | 2021-05-20 | 2021-05-20 | Cable condensation state monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110552313.8A CN113432638A (en) | 2021-05-20 | 2021-05-20 | Cable condensation state monitoring method |
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| CN113432638A true CN113432638A (en) | 2021-09-24 |
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| CN202110552313.8A Pending CN113432638A (en) | 2021-05-20 | 2021-05-20 | Cable condensation state monitoring method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024585A (en) * | 2005-07-13 | 2007-02-01 | Ntt Afty Corp | Humidity monitoring method |
| CN103235621A (en) * | 2013-04-28 | 2013-08-07 | 成都思晗科技有限公司 | Mist-preventing intelligent control system for cabinet |
| JP2015017853A (en) * | 2013-07-10 | 2015-01-29 | 富士電機株式会社 | Dew condensation detecting apparatus and equipment |
| CN104652262A (en) * | 2015-01-27 | 2015-05-27 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Stayed cable beam anchorage region dehumidification system and stayed cable beam anchorage region dehumidification method |
| CN205102861U (en) * | 2015-11-18 | 2016-03-23 | 苏州热工研究院有限公司 | Anticorrosive construction environment detects and identification system |
| CN210691022U (en) * | 2019-06-11 | 2020-06-05 | 贵州电网有限责任公司 | External anti-icing and anti-fogging device of dome camera |
| CN111933974A (en) * | 2020-07-31 | 2020-11-13 | 广东国鸿氢能科技有限公司 | Method for testing dew point temperature of humidifying reaction gas of fuel cell |
| CN112380654A (en) * | 2020-11-18 | 2021-02-19 | 潍柴动力股份有限公司 | Engine condensation state detection method and device, ECU and storage medium |
-
2021
- 2021-05-20 CN CN202110552313.8A patent/CN113432638A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024585A (en) * | 2005-07-13 | 2007-02-01 | Ntt Afty Corp | Humidity monitoring method |
| CN103235621A (en) * | 2013-04-28 | 2013-08-07 | 成都思晗科技有限公司 | Mist-preventing intelligent control system for cabinet |
| JP2015017853A (en) * | 2013-07-10 | 2015-01-29 | 富士電機株式会社 | Dew condensation detecting apparatus and equipment |
| CN104652262A (en) * | 2015-01-27 | 2015-05-27 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Stayed cable beam anchorage region dehumidification system and stayed cable beam anchorage region dehumidification method |
| CN205102861U (en) * | 2015-11-18 | 2016-03-23 | 苏州热工研究院有限公司 | Anticorrosive construction environment detects and identification system |
| CN210691022U (en) * | 2019-06-11 | 2020-06-05 | 贵州电网有限责任公司 | External anti-icing and anti-fogging device of dome camera |
| CN111933974A (en) * | 2020-07-31 | 2020-11-13 | 广东国鸿氢能科技有限公司 | Method for testing dew point temperature of humidifying reaction gas of fuel cell |
| CN112380654A (en) * | 2020-11-18 | 2021-02-19 | 潍柴动力股份有限公司 | Engine condensation state detection method and device, ECU and storage medium |
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