CN104375543A - Internal temperature and humidity measurement method of power distribution cabinet - Google Patents
Internal temperature and humidity measurement method of power distribution cabinet Download PDFInfo
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- CN104375543A CN104375543A CN201410747876.2A CN201410747876A CN104375543A CN 104375543 A CN104375543 A CN 104375543A CN 201410747876 A CN201410747876 A CN 201410747876A CN 104375543 A CN104375543 A CN 104375543A
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Abstract
The invention discloses an internal temperature and humidity measurement method of a power distribution cabinet in the field of power transmission and distribution. The method includes the steps that a host sends an instruction of starting data transmission; the host judges whether a temperature and humidity sensor responds to the instruction of starting data or not; the temperature and humidity sensor respectively measures a temperature measuring value and a humidity measuring value in the power distribution cabinet; the host reads the temperature measuring value and the humidity measuring value in the power distribution cabinet from the temperature and humidity sensor; the host reads temperature and humidity verification data from the temperature and humidity sensor; the host computes and compensates the temperature measuring value and the humidity measuring value which are read, computes the dew point so as to guarantee that the measuring result is displayed only when the temperature in the power distribution cabinet is above the dew point, and transmits the dew point to a relay for controlling a heater in the power distribution cabinet so as to enable the heater in the power distribution cabinet to be kept under a normally open state when the temperature in the power distribution cabinet is below the dew point.
Description
Technical field
Temperature and humidity measurement method in a kind of power distribution cabinet that the present invention relates to power transmission and distribution field.
Background technology
When the electric power such as electric equipment protection cabinet, instrument box, metering cabinet, switch cubicle, terminal box are established under as too low in temperature in long-time running, the environment such as temperature is too high or humidity is excessive, its safe operation all will be on the hazard.
All well heater is housed in current power distribution cabinet, to ensure that the temperature and humidity in power distribution cabinet keeps normal level.Power distribution cabinet internal heater mostly is normally on, and wherein heating installation power supply loop is powered by alternating current bus bar, uses well heater P cock to carry out the switching of loop turn-on and turn-off.Section heaters adopts the automatic anti-condensation single-chip microcomputer of the KS-3-4S of Changzhou Chang Gong Electron equipment Co., Ltd series humiture, carries out " Bang Bang " and controls, complete the switching of heater circuit by temperature and humidity in sensor sample storehouse.
When adopting nation of nation single-chip microcomputer to control the well heater in power distribution cabinet, when sensor detects that the temperature in power distribution cabinet or humidity exceed setting value, control circuit is connected well heater and is heated up, and lift tank temperature destroys condensation formation condition, reduces the humidity of environment.When temperature rises to predetermined value or when humidity is down to predetermined value, single-chip microcomputer stops heating automatically, reaches intensification, drives the object of tide.
Owing to adopting " Bang Bang " to control, the humidity and temperature in power distribution cabinet will be made to produce larger moment and to become fluctuation, the can not be carried out and control smoothly, and temperature regulating time be also longer, is also unfavorable for the stable operation of equipment in power distribution cabinet.Adopt nation nation to control to record well heater simultaneously and open temperature and humidity when turn-off time and well heater are opened or turned off, be unfavorable for the statistics that work of transformer substation environment and line loss are promoted.
Switch for well heater can be realized by the turn-on and turn-off of relay, but this proposes very high requirement to the temperature measuring equipment be connected with relay and method.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of temperature and humidity measurement method in power distribution cabinet is provided, the temperature and humidity in power distribution cabinet is measured by the method, and in this, as controlling the foundation of relay and well heater turn-on and turn-off in power distribution cabinet, the proper operation to relay in power distribution cabinet and well heater can be ensured, thus ensure the in good time turn-on and turn-off of power distribution cabinet internal heater.
The another kind of technical scheme realizing above-mentioned purpose is: a kind of temperature and humidity measurement method in power distribution cabinet, comprises the following steps:
Step1: main frame sends the instruction starting data transmission to Temperature Humidity Sensor;
Step2: main frame judges whether Temperature Humidity Sensor responds the instruction starting data;
Step3: described Temperature Humidity Sensor measures measured temperature in power distribution cabinet and humidity measurements respectively;
Step4: described main frame is from the measured temperature in described temperature sensor reading power distribution cabinet and humidity measurements;
Step5: described main frame reads the checking data of temperature and humidity from described Temperature Humidity Sensor;
Step6: described main frame calculates the measured temperature read and humidity measurements and compensates, calculate dew point, to ensure the temperature ability display measurement result more than dew point in power distribution cabinet, and pass to the relay controlling power distribution cabinet internal heater, to make when distribution in-cabinet temperature is lower than dew point, the well heater in power distribution cabinet keeps the state often opened.
Further, described Temperature Humidity Sensor after the instruction receiving the startup data transmission that main frame sends, at the 8th clock falling edge, by drop-down for data bus be low level, as described Temperature Humidity Sensor to the response starting the instruction that data are transmitted.
Further, data bus draws as low level after measuring measured temperature in power distribution cabinet and humidity measurements respectively by described Temperature Humidity Sensor.
Further, described main frame first reads the high byte data the measured value of temperature and humidity from described Temperature Humidity Sensor, then reads the low byte data the measured value of temperature and humidity from described Temperature Humidity Sensor.
Further, described main frame is after the measured value receiving the temperature and humidity that Temperature Humidity Sensor is measured, and revise the measured value of temperature and humidity, wherein, revised humidity is:
RH_TURE＝(T_C-25)*(0.01+0.00008*rh)+Rh_true；
Wherein, Rh_true=C3*rh*rh+C2*rh+C1,
Wherein, Rh_true is the humidity value after linear compensation, and rh is humidity measurements, and C1, C2, C3 are linear compensation factors, and T_C is temperature actual value.
Further, in described Framework computing power distribution cabinet, the computing formula of dew point is
LogEW＝0.66077+7.5×T_C/(237.3+T_C)+log10(rh)-2
Dp＝((0.66077-logEW)×237.3)/(logEW-8.16077)
In formula: T_C is temperature actual value, Dp is dew point.
Have employed temperature and humidity measurement method in a kind of power distribution cabinet of the present invention, main frame sends the instruction starting data transmission; Main frame judges whether Temperature Humidity Sensor responds the instruction starting data; Described Temperature Humidity Sensor measures measured temperature in power distribution cabinet and humidity measurements respectively; Described main frame is from the measured temperature in described temperature sensor reading power distribution cabinet and humidity measurements; Described main frame reads the checking data of temperature and humidity from described Temperature Humidity Sensor; The measured value of described main frame to the measured temperature read and humidity calculates and compensates, calculate dew point, to ensure the temperature ability display measurement result more than dew point in power distribution cabinet, and pass to the relay controlling power distribution cabinet internal heater, to make when distribution in-cabinet temperature is lower than dew point, the well heater in power distribution cabinet keeps the state often opened.Its technique effect is: measure the temperature and humidity in power distribution cabinet by the method, and in this, as controlling the foundation of relay and well heater turn-on and turn-off in power distribution cabinet, the proper operation to relay in power distribution cabinet and well heater can be ensured, thus ensure the in good time turn-on and turn-off of power distribution cabinet internal heater.
Accompanying drawing explanation
The schematic diagram of the measurement mechanism that Fig. 1 adopts for temperature and humidity measurement method in a kind of power distribution cabinet of the present invention.
The sequential chart of clock bus and data bus work in the measurement mechanism that Fig. 2 adopts for temperature and humidity measurement method in a kind of power distribution cabinet of the present invention.
Fig. 3 is the process flow diagram of temperature and humidity measurement method in a kind of power distribution cabinet of the present invention.
Embodiment
Refer to Fig. 1, the present inventor, in order to understand technical scheme of the present invention better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
The measurement mechanism that in a kind of power distribution cabinet of the present invention, temperature and humidity measurement method adopts, comprises Temperature Humidity Sensor 1 and main frame 2.What Temperature Humidity Sensor 1 adopted is SHT11 Temperature Humidity Sensor, SHT11 Temperature Humidity Sensor adopts the form of SMD (surface encapsulation device) and CC (without battle array stitch), interface is very simple, pin 1 ground connection on SHT11 Temperature Humidity Sensor, become ground connection (GND) end, the pin 4 on SHT11 chip 11 connects power supply, becomes power supply (VDD) end, its voltage range connected is 2.4 ~ 5.5V, and normal value is 3.3V.The pin 2 connection data bus of SHT11 Temperature Humidity Sensor, becomes data (DATA) end, for transmitting the measured value of the temperature and humidity in power distribution cabinet to main frame 2.Pin 3 connects clock bus, for reading clock data from main frame 2, becomes clock (CLK) end.Clock end on SHT11 Temperature Humidity Sensor and data terminal, form a two-wire serial digital interface.Wherein be connected with the resistance that a resistance is 47k Ω between data bus and power end, between power end and earth terminal, be also provided with the electric capacity that a resistance is 0.1 μ F.
Temperature Humidity Sensor 1 can measure the temperature and humidity in power distribution cabinet, the temperature data collected and humidity data is stored in its memory simultaneously.This SHT11 Temperature Humidity Sensor also has reset function simultaneously, and the storer of SHT11 Temperature Humidity Sensor can be reset, the time interval between any twice reset is at least 11ms.
Main frame 2 adopts STM32 single-chip microcomputer, and STM32 single-chip microcomputer connects Temperature Humidity Sensor 1 by serial two-wire bus.Wherein, what connect the data terminal of SHT11 Temperature Humidity Sensor is data bus in serial two-wire bus, and what connect the clock end of SHT11 Temperature Humidity Sensor is clock bus in serial two-wire bus.
First STM32 single-chip microcomputer adopts the startup of one group of " starting transmission " temporal representation data transmission, as shown in Figure 2.When clock bus is high level, data bus upset is low level; And then clock bus becomes low level, becomes high level again subsequently; When clock bus is high level, data bus overturns again as high level.SHT11 Temperature Humidity Sensor starts the temperature and humidity measured in power distribution cabinet.
The process of SHT11 Temperature Humidity Sensor measuring tempeature and humidity is:
Main frame 2 sends startup command to Temperature Humidity Sensor 1, and the data bus between Temperature Humidity Sensor 1 and main frame 2 is set to input state, waits for the response of Temperature Humidity Sensor 1.
Temperature Humidity Sensor 1 after receiving the enabled instruction that main frame sends, at the 8th clock falling edge, by drop-down for data bus be low level, as the confirmation signal of Temperature Humidity Sensor 1.
Data bus, after the 9th clock falling edge, is recovered high level by Temperature Humidity Sensor 1.
Temperature Humidity Sensor 1 starts to measure current humidity, and after measurement terminates, again draws data bus into low level.
Main frame 2 measures after data bus dragged down, and learns that the measurement of Temperature Humidity Sensor 1 pair of humidity and temperature terminates, provides the clock signal reading data from Temperature Humidity Sensor 1.
Eight clock falling edge of Temperature Humidity Sensor 1 after measurement terminates starts to export data, the high byte data in the measured value of first output temperature and humidity.
Temperature Humidity Sensor 1 is measuring the 9th clock falling edge after terminating, and data bus draws as low level by main frame 2, as the confirmation signal received, then discharges data bus, draws data bus into high level.
At eight clock falling edge subsequently, Temperature Humidity Sensor 1 sends the low byte data in the measured value of temperature and humidity.
An ensuing clock falling edge, data bus draws as low level by main frame 2, as the confirmation signal received.
Last eight clock falling edge, Temperature Humidity Sensor 1 sends CRC check data, and main frame 2 will not be replied, and measures and terminates.
The computing method of the humidity compensate of main frame 2 are:
Temperature Humidity Sensor 1 is by the measured value of data bus directly to main frame 2 output temperature and the measured value of humidity.This humidity value is called " relative humidity ", just can obtain humidity value comparatively accurately after needing to carry out linear compensation and temperature compensation.
Because relative humidity numeral output characteristics is certain non-linear, therefore non-linear in order to compensation for temperature humidity sensor 1, can by following formula correction humidity value: in formula: Rh_true is the humidity value after linear compensation, rh is relative humidity measurements, the i.e. data of 12, C1, C2, C3 are linear compensation factors, and temperature actual value is T_C.
Rh_true＝C3*rh*rh+C2*rh+C1
Consider the impact of temperature on humidity, do corresponding compensation:
RH_TURE＝(T_C-25)*(0.01+0.00008*rh)+Rh_true
Because SHT11 Temperature Humidity Sensor is the temperature-sensing element (device) adopting gap material to make, thus there is good linear convergent rate.Temperature actual value can be calculated by following formula:
T_C＝d1+d2×t,
Wherein t is the measured value of temperature, is the data of 14, wherein d1=-40, d2=0.01.
The formula of Temperature Humidity Sensor 1 calculation is:
Dew point is a special temperature value, is the minimum temperature that air keeps certain certain humidity and must reach.When the temperature of air is lower than dew point, Air containment not too much moisture, these moisture can become mist, dew or frost.Dew point can calculate according to current relative humidity value and temperature actual value, and concrete computing formula is as follows:
LogEW＝0.66077+7.5×T_C/(237.3+T_C)+log10(rh)-2
Dp＝((0.66077-logEW)×237.3)/(logEW-8.16077)
In formula: T_C is temperature actual value, Dp is dew point.
In a kind of power distribution cabinet of the present invention, the flow process of temperature and humidity measurement method is:
Main frame 2 starts data transmission;
Judge whether Temperature Humidity Sensor 1 responds;
Temperature Humidity Sensor 1 measures the humidity data of 12 and the temperature data of 14 in power distribution cabinet respectively;
Main frame 2 reads the measured value of temperature and humidity in power distribution cabinet from temperature sensor 1;
Main frame 2 reads the checking data of temperature and humidity from Temperature Humidity Sensor 1;
The measured value of main frame 2 to the temperature and humidity read calculates and compensates, calculate dew point, to ensure the temperature ability display measurement result more than dew point in power distribution cabinet, and pass to the relay controlling power distribution cabinet internal heater, to make when distribution in-cabinet temperature is lower than dew point, the well heater in power distribution cabinet keeps the state often opened.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (6)
1. a temperature and humidity measurement method in power distribution cabinet, comprises the following steps:
Step1: main frame sends the instruction starting data transmission to Temperature Humidity Sensor;
Step2: main frame judges whether Temperature Humidity Sensor responds the instruction starting data;
Step3: described Temperature Humidity Sensor measures measured temperature in power distribution cabinet and humidity measurements respectively;
Step4: described main frame is from the measured temperature in described temperature sensor reading power distribution cabinet and humidity measurements;
Step5: described main frame reads the checking data of temperature and humidity from described Temperature Humidity Sensor;
Step6: described main frame calculates the measured temperature read and humidity measurements and compensates, calculate dew point, to ensure the temperature ability display measurement result more than dew point in power distribution cabinet, and pass to the relay controlling power distribution cabinet internal heater, to make when distribution in-cabinet temperature is lower than dew point, the well heater in power distribution cabinet keeps the state often opened.
2. temperature and humidity measurement method in a kind of power distribution cabinet according to claim 1, it is characterized in that: described Temperature Humidity Sensor is after the instruction receiving the startup data transmission that main frame sends, at the 8th clock falling edge, by drop-down for data bus be low level, as described Temperature Humidity Sensor to the response of instruction starting data transmission.
3. temperature and humidity measurement method in a kind of power distribution cabinet according to claim 1, is characterized in that: data bus draws as low level after measuring measured temperature in power distribution cabinet and humidity measurements respectively by described Temperature Humidity Sensor.
4. temperature and humidity measurement method in a kind of power distribution cabinet according to claim 3, it is characterized in that: described main frame first reads the high byte data the measured value of temperature and humidity from described Temperature Humidity Sensor, then read the low byte data the measured value of temperature and humidity from described Temperature Humidity Sensor.
5. temperature and humidity measurement method in a kind of power distribution cabinet according to claim 3, it is characterized in that: described main frame is after the measured value receiving the temperature and humidity that Temperature Humidity Sensor is measured, revise the measured value of temperature and humidity, wherein, revised humidity is:
RH_TURE＝(T_C-25)*(0.01+0.00008*rh)+Rh_true；
Wherein, Rh_true=C3*rh*rh+C2*rh+C1,
Wherein, Rh_true is the humidity value after linear compensation, and rh is humidity measurements, and C1, C2, C3 are linear compensation factors, and T_C is temperature actual value.
6. temperature and humidity measurement method in a kind of power distribution cabinet according to claim 3, is characterized in that: in described Framework computing power distribution cabinet, the computing formula of dew point is
LogEW＝0.66077+7.5×T_C/(237.3+T_C)+log10(rh)-2
Dp＝((0.66077-logEW)×237.3)/(logEW-8.16077)
In formula: T_C is temperature actual value, Dp is dew point.
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| CN201410747876.2A CN104375543A (en) | 2014-12-09 | 2014-12-09 | Internal temperature and humidity measurement method of power distribution cabinet |
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| CN105509818A (en) * | 2016-02-01 | 2016-04-20 | 江苏省电力公司检修分公司 | High-voltage cabinet dew point detection system and method thereof |
| CN110471132A (en) * | 2019-08-23 | 2019-11-19 | 国网山东省电力公司济南供电公司 | The method for monitoring outdoor ring main unit or feeder pillar condensation on-line |
| CN111780813A (en) * | 2020-08-12 | 2020-10-16 | 杭州鸿程科技有限公司 | Prediction type condensation monitoring method and device |
| CN112034914A (en) * | 2020-09-18 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Zigbee wireless communication-based temperature and humidity control system for terminal box of transformer substation |
| CN112527032A (en) * | 2019-09-17 | 2021-03-19 | 北京金风科创风电设备有限公司 | Method, device and system for monitoring humidity of electric control cabinet |
| WO2022083153A1 (en) * | 2020-10-22 | 2022-04-28 | 青岛海信宽带多媒体技术有限公司 | Temperature control method and device for optical module, and optical module |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105509818A (en) * | 2016-02-01 | 2016-04-20 | 江苏省电力公司检修分公司 | High-voltage cabinet dew point detection system and method thereof |
| CN110471132A (en) * | 2019-08-23 | 2019-11-19 | 国网山东省电力公司济南供电公司 | The method for monitoring outdoor ring main unit or feeder pillar condensation on-line |
| CN110471132B (en) * | 2019-08-23 | 2021-06-08 | 国网山东省电力公司济南供电公司 | Method for monitoring condensation of outdoor ring main unit or branch box on line |
| CN112527032A (en) * | 2019-09-17 | 2021-03-19 | 北京金风科创风电设备有限公司 | Method, device and system for monitoring humidity of electric control cabinet |
| CN111780813A (en) * | 2020-08-12 | 2020-10-16 | 杭州鸿程科技有限公司 | Prediction type condensation monitoring method and device |
| CN112034914A (en) * | 2020-09-18 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Zigbee wireless communication-based temperature and humidity control system for terminal box of transformer substation |
| WO2022083153A1 (en) * | 2020-10-22 | 2022-04-28 | 青岛海信宽带多媒体技术有限公司 | Temperature control method and device for optical module, and optical module |
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