CN104503521A - Temperature and humidity measuring device in power distribution cabinet - Google Patents
Temperature and humidity measuring device in power distribution cabinet Download PDFInfo
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- CN104503521A CN104503521A CN201410747878.1A CN201410747878A CN104503521A CN 104503521 A CN104503521 A CN 104503521A CN 201410747878 A CN201410747878 A CN 201410747878A CN 104503521 A CN104503521 A CN 104503521A
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Abstract
The invention discloses a temperature and humidity measuring device in a power distribution cabinet in the field of power transmission and distribution. The temperature and humidity measuring device comprises a temperature and humidity sensor, a host machine and a power supply, wherein a power supply end, a grounding end, a data end and a clock end are arranged on the temperature and humidity sensor, the power supply end is connected with a power supply, the grounding end is grounded, the data end is connected with the host machine through a data bus, the clock end is connected with the host machine through a clock bus, a resistor with the resistance value being 47 kilo ohms is arranged between the power supply and the data bus, and the power supply is grounded through a capacitor with the capacitance value being 0.1muF. After a relay used for controlling the on-off state of a heater is connected with the temperature and humidity measuring device, the conduction and closing time of the relay can be precisely regulated according to temperature and humidity change, and the temperature and humidity in the power distribution cabinet are enabled to be in the reasonable range.
Description
Technical field
Humiture measurement mechanism 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.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, humiture measurement mechanism in a kind of power distribution cabinet is provided, after it is connected with the relay in order to control heater switch, can accurately according to the change of temperature and humidity, the time of adjustment relay and well heater conducting and closedown, ensure that in power distribution cabinet, temperature and humidity in the reasonable scope.
The another kind of technical scheme realizing above-mentioned purpose is: humiture measurement mechanism in a kind of power distribution cabinet, it is characterized in that: comprise Temperature Humidity Sensor, main frame and power supply, described Temperature Humidity Sensor is provided with power end, earth terminal, data terminal and clock end, described power end connects power supply, described earth terminal ground connection, described data terminal connects described main frame by data bus, and described clock end connects described main frame by clock bus; Be provided with the resistance that a resistance is 47k Ω between described power supply and described data bus, described power supply is the capacity earth of 0.1 μ F by a capacitance.
Further, described Temperature Humidity Sensor is SHT11 Temperature Humidity Sensor, and described main frame is STM32 single-chip microcomputer.
Further, described main frame sends startup command to described Temperature Humidity Sensor, and the data bus between described Temperature Humidity Sensor and described main frame is set to input state, waits for the response of described Temperature Humidity Sensor;
Described Temperature Humidity Sensor after receiving the enabled instruction that main frame sends, at the 8th clock falling edge, by drop-down for described data bus be low level, as the confirmation signal of described Temperature Humidity Sensor,
Described data bus, after the 9th clock falling edge, is recovered high level by described Temperature Humidity Sensor,
Described Temperature Humidity Sensor starts to measure current humidity, and after measurement terminates, again draws as low level by described data bus,
Described main frame measures after described data bus dragged down, and learns that the measurement of described Temperature Humidity Sensor to humidity and temperature terminates, provides the clock signal reading data from described Temperature Humidity Sensor,
Eight clock falling edge of described Temperature Humidity Sensor after measurement terminates starts to export data, the high byte data in the measured value of first output temperature and humidity,
Described Temperature Humidity Sensor is measuring the 9th clock falling edge after terminating, and described data bus draws as low level by described main frame, as the confirmation signal received, then discharges described data bus, is drawn by described data bus as high level,
At eight clock falling edge subsequently, described Temperature Humidity Sensor sends the low byte data in the measured value of temperature and humidity,
An ensuing clock falling edge, described data bus draws as low level by described main frame, as the confirmation signal received,
Last eight clock falling edge, described Temperature Humidity Sensor sends CRC check data, and described main frame will not be replied, and measures and terminates.
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 the technical scheme of humiture measurement mechanism in a kind of power distribution cabinet of the present invention, comprise Temperature Humidity Sensor, main frame and power supply, described Temperature Humidity Sensor is provided with power end, earth terminal, data terminal and clock end, described power end connects power supply, described earth terminal ground connection, described data terminal connects described main frame by data bus, and described clock end connects described main frame by clock bus; Be provided with the resistance that a resistance is 47k Ω between described power supply and described data bus, described power supply is the capacity earth of 0.1 μ F by a capacitance.After it is connected with the relay in order to control heater switch, can accurately according to the change of temperature and humidity, the time of adjustment relay and well heater conducting and closedown, ensure that in power distribution cabinet, temperature and humidity is in the reasonable scope.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of humiture measurement mechanism in a kind of power distribution cabinet of the present invention.
Fig. 2 is the sequential chart of clock bus and data bus work in humiture measurement mechanism in a kind of power distribution cabinet of the present invention.
Fig. 3 is the process flow diagram of humiture measurement mechanism work 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:
Humiture measurement mechanism in a kind of power distribution cabinet of the present invention, 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 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 workflow of humiture measurement mechanism 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 (5)
1. humiture measurement mechanism in a power distribution cabinet, it is characterized in that: comprise Temperature Humidity Sensor, main frame and power supply, described Temperature Humidity Sensor is provided with power end, earth terminal, data terminal and clock end, described power end connects power supply, described earth terminal ground connection, described data terminal connects described main frame by data bus, and described clock end connects described main frame by clock bus; Be provided with the resistance that a resistance is 47k Ω between described power supply and described data bus, described power supply is the capacity earth of 0.1 μ F by a capacitance.
2. humiture measurement mechanism in a kind of power distribution cabinet according to claim 1, it is characterized in that: described Temperature Humidity Sensor is SHT11 Temperature Humidity Sensor, described main frame is STM32 single-chip microcomputer.
3. humiture measurement mechanism in a kind of power distribution cabinet according to claim 1, it is characterized in that: described main frame sends startup command to described Temperature Humidity Sensor, and the data bus between described Temperature Humidity Sensor and described main frame is set to input state, wait for the response of described Temperature Humidity Sensor;
Described Temperature Humidity Sensor after receiving the enabled instruction that main frame sends, at the 8th clock falling edge, by drop-down for described data bus be low level, as the confirmation signal of described Temperature Humidity Sensor,
Described data bus, after the 9th clock falling edge, is recovered high level by described Temperature Humidity Sensor,
Described Temperature Humidity Sensor starts to measure current humidity, and after measurement terminates, again draws as low level by described data bus,
Described main frame measures after described data bus dragged down, and learns that the measurement of described Temperature Humidity Sensor to humidity and temperature terminates, provides the clock signal reading data from described Temperature Humidity Sensor,
Eight clock falling edge of described Temperature Humidity Sensor after measurement terminates starts to export data, the high byte data in the measured value of first output temperature and humidity,
Described Temperature Humidity Sensor is measuring the 9th clock falling edge after terminating, and described data bus draws as low level by described main frame, as the confirmation signal received, then discharges described data bus, is drawn by described data bus as high level,
At eight clock falling edge subsequently, described Temperature Humidity Sensor sends the low byte data in the measured value of temperature and humidity,
An ensuing clock falling edge, described data bus draws as low level by described main frame, as the confirmation signal received,
Last eight clock falling edge, described Temperature Humidity Sensor sends CRC check data, and described main frame will not be replied, and measures and terminates.
4. humiture measurement mechanism 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.
5. humiture measurement mechanism 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410747878.1A CN104503521A (en) | 2014-12-09 | 2014-12-09 | Temperature and humidity measuring device in power distribution cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410747878.1A CN104503521A (en) | 2014-12-09 | 2014-12-09 | Temperature and humidity measuring device in power distribution cabinet |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203982237U (en) * | 2014-07-17 | 2014-12-03 | 福州大学 | The anti-condensation supervising device of transformer station |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203982237U (en) * | 2014-07-17 | 2014-12-03 | 福州大学 | The anti-condensation supervising device of transformer station |
Non-Patent Citations (2)
| Title |
|---|
| 姜连祥等: "《温湿度传感器SHT11的感测***设计》", 《单片机与嵌入式***应用》 * |
| 张永安: "基于SHT11露点测定***的设计与实现", 《内蒙古农业大学学报》 * |
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Application publication date: 20150408 |