DE212011100059U1 - Calibration device for online sulfur hexafluoride moisture analyzers - Google Patents

Abstract

Calibration device for online sulfur hexafluoride moisture measuring devices, characterized in that a gas storage container (1) is connected to a calibration chamber (3) by a gas outlet pipe, a calibration inlet valve (5) being arranged on the gas outlet pipe, the calibration chamber being connected by a pipe a cycle pump chamber (4) is connected, on the gas discharge pipe of the cycle pump chamber a contact valve (7), a gas discharge valve (8) and a gas discharge flow rate measuring device (14) are arranged in a sequence, the outlet pipe of the cycle pump chamber with the gas reservoir (1) is connected, an outlet valve (6) being arranged on the outlet pipe, a diaphragm pump (13) being arranged inside the cycle pump chamber (4), a cycle pressure measuring device (11) being arranged on the cycle pump chamber (4), wherein on the calibration chamber ( 3) an interface (12) for connecting to the calibrated moisture sensors is ordered; wherein a pressure measuring device (15) is arranged on the gas storage chamber (1), a gas inlet pipe being arranged on the gas storage chamber (1), a gas inlet valve (16) being arranged on the gas inlet pipe; where a vacuum pump through a vacuum pipe ...

Description

Technical area

The present invention relates to a calibration device for checking moisture meters, in particular a calibration device for online sulfur hexafluoride moisture meters.

State of the art

Sulfur hexafluoride is used in high voltage equipment as the isolation gas and the arc protection gas. The size of the moisture of the sulfur hexafluoride gas has a direct influence on its insulating ability. Exact online measurement of sulfur hexafluoride gas humidity plays an extremely important role in ensuring the safety of gas-filled electrical equipment. However, at present, the comparison and calibration of the sulfur hexafluoride moisture sensors widely used in substations and on lines are taking place under normal voltage, and the accuracy of measurement at the working state can not be ensured. Because of the structure of the moisture meters, the comparison and calibration also can not guarantee that the sensor-checked gas is in compliance with the standard gas.

Content of the invention

The object of the present invention is to provide a calibration device for on-line sulfur hexafluoride moisture meters to accomplish the comparison and verification of on-line moisture meters operating under different gas pressure and humidity conditions.

The object of the present invention is achieved: a calibration device for online sulfur hexafluoride moisture meters, wherein a gas reservoir is connected by a gas outlet tube with a calibration chamber, wherein on the gas outlet tube a calibration inlet valve is arranged, wherein the calibration chamber through a tube with a cycle pump chamber connected to the gas discharge tube of the cycle pump chamber, a contact valve, a gas discharge valve and a gas discharge Flußmengenmessgerät in an order, wherein the outlet tube of the cycle pump chamber is connected to the gas reservoir, wherein on the outlet pipe an outlet valve is arranged, wherein a diaphragm pump within the Cycle pumping chamber is arranged, wherein a cycle pressure measuring device is arranged on the cycle pumping chamber, wherein an interface for connecting to the calibrated humidity sensors is arranged on the calibration chamber; wherein on the gas storage chamber, a pressure gauge is arranged, wherein on the gas storage chamber, a gas inlet pipe is arranged, wherein on the gas inlet pipe, a gas inlet valve is arranged; wherein a vacuum pump is connected by a vacuum pipe to the gas reservoir, wherein on the vacuum pipe, the vacuum pump gas inlet valve is arranged.

At the above-mentioned gas reservoir, a safety valve is arranged.

The above-mentioned pressure gauge and the above-mentioned cycle pressure gauge are both dual purpose positive pressure vacuum pressure gauges; the gas reservoir, the vacuum pump, the calibration chamber and the cycle pump chamber are mounted on a mobile cart tray.

The calibration device for online sulfur hexafluoride moisture meters of the present invention is used in accordance with the following steps:

a) system drying:

Close the contact valve, the gas discharge valve, the gas inlet valve, open the calibration inlet valve, the outlet valve and the vacuum pump gas inlet valve, start the diaphragm pump and the vacuum pump, exhaust the gas until the cycle pressure gauge and the pressure gauge show -0.08 MPa, stop the vacuum pump , Closing the vacuum pump gas inlet valve, injecting dry nitrogen through the gas inlet valve until the cycle pressure gauge and pressure gauge show 1.2 MPa; Opening the contact valve and the gas discharge valve until the pressure is reduced to 0.12 MPa, closing the gas inlet valve; Repeat the operations for three times, closing the vacuum pump gas inlet valve after completing system drying.

b) Gas configuration in the static state:

Blowing a certain amount of water vapor and dry nitrogen by calculation through the gas inlet valve until the gas in the tank reaches the required pressure.

c) Determining a sample:

5 minutes after circulating the gas inside the system, opening the contact valve and the gas discharge valve, discharging the gas for 2 minutes at a rate of 0.2 L / min, taking a sample of the Outlet opening of the gas discharge flow meter and checking the water content of the gas in the gas storage tank.

d) Calibrate:

Closing the calibration inlet valve, outlet valve, opening the contact valve, relieving the pressure of the calibration chamber and the cycle pump chamber through the gas discharge valve, removing the interface of the calibration chamber, connecting the calibrated humidity sensor;
Opening the calibration inlet valve, cleaning the calibration chamber and the cycle pump chamber for 5 minutes at a rate of 0.5 L / min, opening the outlet valve, closing the contact valve and the gas discharge valve, circulating for 2 minutes;
Opening the contact valve, closing the calibration inlet valve and the outlet valve, opening the gas outlet valve to lower the pressure of the calibration chamber and the cycle pump chamber to the working pressure of the humidity sensor, calibrating the humidity sensor, calibrating the sensor at the same humidity and at several pressure points from high to low.

Adjusting the gas humidity in the gas reservoir by dry nitrogen, repeating the procedure of sampling and calibrating, finishing the calibration at different humidity;
Repeating the above procedure after changing the sensor;
The above-mentioned negative pressure is the current pressure, the positive pressure is the pressure of the measuring device.

Configure the gas with a certain humidity, complete circulation in the devices compared, so that the entire device has a stable humidity. Performing the comparison of online moisture measuring devices after sampling according to the standard moisture measuring method. This device can realize the comparison of on-line moisture measuring devices when working under different gas pressure and humidity. The accuracy of the online moisture measuring device can be significantly increased.

The present invention simulates the sample of sulfur hexafluoride gas on-site (laboratory) to form the standard sample with stable water content.

The concrete method is to add a certain amount of gas containing water to the gas reservoir, add dry gas to adjust the water content in the gas reservoir, and the gas pressure in the gas reservoir is higher than the working pressure of the sulfur hexafluoride gas humidity sensor. Calibrating the on-line device using humidity accurately measured by standard methods for reference. Changing the working pressure of the humidity sensor, measuring the same humidity gas under different pressure by the on-line moisture measuring device, checking the adaptability of the on-line moisture measuring device to the pressure change in the practical operating environment. Using the standard gas with different humidity, checking the accuracy of the online moisture meter. The apparatus consists mainly of the gas reservoir, the vacuum pump, the gas cycle system, the pressure control system, the pressure adjustment system, the system for taking and sorting samples.

The entire device is mounted on the reliable mobile cart shelf so that it has the mobility.

The working principle:

Drying the gas reservoir and maintaining the required degree of vacuum by the vacuum extraction process and the dry gas cleaning process. Blowing a certain volume of saturated gas and dry gas according to the volume of the gas reservoir, the temperature of the environment, and the predetermined gas pressure in the gas reservoir, the maximum specified moisture content. Connect the piping of the entire system, starting the cycle system, so that the gas humidity in the gas space of the entire system is uniform. Measuring the gas humidity by weight method or precision dew point method, finishing the determination of the sample, obtaining the standard gas. Closing the respective piping valve at the inlet port and the outlet port of the gas reservoir, adjusting the working pressure of the humidity sensor, measuring the gas of equal humidity under different pressure by the on-line moisture measuring device, checking the adaptability of the on-line moisture measuring device to the pressure change. Changing the online moisture meter, thoroughly cleaning the outdoor system with standard gas, circulating the gas throughout the system. Repeat in this manner, achieving the moisture measurement stability of multiple online moisture meters in the simulated practical operating environment as the pressure changes.

Repeat the above procedure after changing the gas humidity, checking the Accuracy of measuring different humidity through the online moisture meter.

• 1. Die Arbeitsumgebung vor Ort von Schwefelhexafluorid-Sensoren wird simuliert: Die Online-Schwefelhexafluorid-Feuchtigkeitsvorrichtung wird unter Verwendung von feuchtigkeitshaltigem Gas mit hohem Druck in einer Umgebung kalibriert, die ähnlich zu der Arbeitsumgebung ist. Die Zuverlässigkeit der Datenkontrolle durch die Online-Vorrichtung wird erhöht.
• 2. Konfigurieren des Standardgases in statischem Zustand: Beim Konfigurieren des Standardgases in statischem Zustand wird die Probe mithilfe von Standardverfahren bestimmt, die Feuchtigkeitsschwankungen bei dynamischem Gaskonfigurieren werden überwunden. Die Faktoren, die die Feuchtigkeit beeinflussen, werden reduziert.
• 3. Die Feuchtigkeit des Standardgases ist stabil: Durch das Hochdruck-Abgedichte-System wird die mögliche Feuchtigkeitsänderung des Standardgases wegen der Feuchtigkeitsdifferenz zwischen der Umgebungsluft und dem Standardgas unter normalem Druck überwunden. Die Feuchtigkeit des Standardgases ist stabil. Die Voraussetzungen der gesamten Kalibrierung werden erfüllt.
• 4. Das Standardgas weist ein großes Volumen auf: Ein großes Volumen von Standardgas kann auf einmal konfiguriert werden, die Kalibrierung von mehreren Online-Vorrichtungen kann durchgeführt werden.
• 5. Die Handhabung ist einfach: Nach der Vakuumabsaugung des Gasvorratsbehälters ist es einfach, den Gasvorratsbehälter zu trocknen. Durch Vakuum kann Hochfeuchtigkeitshaltiges Gas einfach in den Gasvorratsbehälter eingeblast und die Feuchtigkeit des Standardgases einfach eingestellt werden.
• 6. Hauptsächliche technische Parameter und Eigenschaftsindikatoren: Zyklusflussmenge: 300 L/h (Unter dem Druck des Gasvorratsbehälters); Gasvorratsvolumen: 20 L (1.2 MPa); Arbeitsdruck (Messgerätdruck): 0 MPa–0,8 MPa; Arbeitsgeräusch: 45 dB (A); Außenformgröße: 800 × 750 × 450 mm.

The present invention has the following properties and advantages:

• 1. The on-site work environment of sulfur hexafluoride sensors is simulated: The online sulfur hexafluoride humidifier is calibrated using high pressure moisture-containing gas in an environment similar to the work environment. The reliability of the data control by the online device is increased.
• 2. Configure the default gas in static state: When configuring the default gas in static state, the sample is determined using standard techniques, and the humidity variations associated with dynamic gas configuration are overcome. The factors that affect the moisture are reduced.
• 3. The humidity of the standard gas is stable: The high-pressure sealing system overcomes the possible change in humidity of the standard gas due to the humidity difference between the ambient air and the standard gas under normal pressure. The humidity of the standard gas is stable. The requirements of the entire calibration are fulfilled.
• 4. The standard gas has a large volume: a large volume of standard gas can be configured at once, the calibration of several online devices can be performed.
• 5. Handling is easy: After vacuuming the gas storage tank, it is easy to dry the gas storage tank. By vacuum, high-humidity gas can be easily injected into the gas reservoir and the humidity of the standard gas can be easily adjusted.
• 6. Main technical parameters and property indicators: Cycle flow rate: 300 L / h (Under the pressure of the gas storage tank); Gas storage volume: 20 L (1.2 MPa); Working pressure (gauge pressure): 0 MPa-0.8 MPa; Working noise: 45 dB (A); Outside mold size: 800 × 750 × 450 mm.

Information about drawings:

1 illustrates the system components of the present device simplified;

2 shows the arrangement of the illustrated components;

3 respectively. 4 is the left view or the top view of 2 ,

Detailed embodiment

1 shows a calibration device for online sulfur hexafluoride moisture meters, wherein a gas storage tank 1 through a gas outlet tube with a calibration chamber 3 is connected, wherein at the gas outlet pipe a calibration inlet valve 5 is arranged, wherein the calibration chamber through a tube with a cycle pump chamber 4 is connected, wherein at the gas discharge pipe of the cycle pump chamber, a contact valve 7 , a gas discharge valve 8th and a gas discharge flow rate meter 14 are arranged in an order, wherein the outlet tube of the cycle pumping chamber with the gas reservoir 1 is connected, wherein at the outlet pipe an exhaust valve 6 is arranged, wherein a diaphragm pump 13 within the cycle pump chamber 4 is arranged, wherein at the cycle pump chamber 4 a cycle pressure gauge 11 is arranged, wherein at the calibration chamber 3 an interface 12 is arranged for connection to the calibrated humidity sensors; being at the gas storage chamber 1 a pressure gauge 15 is arranged, wherein at the gas storage chamber 1 a gas inlet pipe is arranged, wherein at the gas inlet pipe, a gas inlet valve 16 is arranged; a vacuum pump through a vacuum pipeline to the gas reservoir 1 connected to the vacuum pipe, the vacuum pump gas inlet valve 9 is arranged. At the gas storage tank 1 becomes a safety valve 10 arranged. The pressure gauge 15 and the cycle pressure gauge 11 Both are dual purpose vacuum pressure gauges for positive pressure; the gas reservoir 1 , the vacuum pump 2 , the calibration chamber 3 and the cycle pump chamber 4 can be mounted on a mobile cart.

Referring to 2 . 3 and 4 the entire device is mounted on the mobile cart tray. The cart tray has a length of 810 mm, a width of 710 mm ( 4 ) and a height of 900 mm ( 2 ).

The Online Sulfur Hexafluoride Moisture Meter Calibrator is used in accordance with the following steps:

a) system drying:

Close the contact valve 7 , the gas discharge valve 8th , the gas inlet valve 16 , Opening the calibration inlet valve 5 , the exhaust valve 6 and the vacuum pump gas inlet valve 9 , Start the diaphragm pump 13 and the vacuum pump 2 , Suctioning the gas until the cycle pressure gauge 11 and the pressure gauge 15 -0.08 MPa, stopping the vacuum pump, closing the vacuum pump gas inlet valve 9 , Blowing dry nitrogen through the gas inlet valve 16 until the cycle pressure gauge 11 and the pressure gauge 15 Show 1.2 MPa; Opening the contact valve 7 and the gas discharge valve 8th until the pressure is reduced to 0.12 MPa, close the gas inlet valve 16 ; Repeat the operations for three times, closing the vacuum pump gas inlet valve 9 after completion of system drying.

b) Gas configuration in the static state:

Injecting a certain amount of water vapor and dry nitrogen by calculation through the gas inlet valve 16 until the gas in the tank reaches the required pressure.

c) Determining a sample:

5 minutes after circulating the gas inside the system, opening the contact valve 7 and the gas discharge valve 8th Discharging the gas for 2 minutes at a rate of 0.2 L / min, taking a sample from the discharge port of the gas discharge flowmeter 14 and checking the water content of the gas in the gas reservoir.

d) Calibrate:

Close the calibration inlet valve 5 , Exhaust valve 6 , Opening the contact valve 7 , Releasing the pressure of the calibration chamber and the cycle pump chamber through the gas discharge valve 8th , Removing the interface of the calibration chamber, connecting the calibrated humidity sensor;
Opening the calibration inlet valve 5 , Cleaning the calibration chamber and the cycle pump chamber for 5 minutes at a rate of 0.5 L / min, opening the exhaust valve 6 , Close the contact valve 7 and the gas discharge valve 8th , Circulate for 2 minutes;
Opening the contact valve 7 , Close the calibration inlet valve 5 and the exhaust valve 6 , Opening the gas discharge valve 8th to lower the pressure of the calibration chamber and the cycle pump chamber to the working pressure of the humidity sensor, calibrate the humidity sensor, calibrate the sensor at the same humidity and at several pressure points with the pressure from high to low;
Adjusting the gas humidity in the gas reservoir by dry nitrogen, repeating the procedure of sampling and calibrating, finishing the calibration at different humidity;
Repeating the above procedure after changing the sensor;
The above-mentioned negative pressure is the current pressure, the positive pressure is the pressure of the measuring device.

Claims (3)

Calibration device for online sulfur hexafluoride moisture measuring devices, characterized in that a gas storage container ( 1 ) through a gas outlet tube with a calibration chamber ( 3 ), wherein at the gas outlet pipe a calibration inlet valve ( 5 ), wherein the calibration chamber is connected through a tube with a cycle pump chamber ( 4 ), wherein at the gas discharge pipe of the cycle pump chamber a contact valve ( 7 ), a gas discharge valve ( 8th ) and a gas discharge flow meter ( 14 ) are arranged in an order, wherein the outlet tube of the cycle pump chamber with the gas reservoir ( 1 ), wherein at the outlet pipe an outlet valve ( 6 ), wherein a diaphragm pump ( 13 ) within the cycle pump chamber ( 4 ), wherein at the cycle pump chamber ( 4 ) a cycle pressure gauge ( 11 ) is arranged, wherein at the calibration chamber ( 3 ) an interface ( 12 ) is arranged for connection to the calibrated humidity sensors; wherein at the gas storage chamber ( 1 ) a pressure gauge ( 15 ) is arranged, wherein at the gas storage chamber ( 1 ) a gas inlet pipe is arranged, wherein at the gas inlet pipe a gas inlet valve ( 16 ) is arranged; a vacuum pump through a vacuum pipeline to the gas reservoir ( 1 ), wherein at the vacuum pipeline, the vacuum pump gas inlet valve ( 9 ) is arranged. Calibration device for online sulfur hexafluoride moisture measuring apparatus according to claim 1, characterized in that on the gas storage tank ( 1 ) a safety valve ( 10 ) is arranged. Calibration device for online sulfur hexafluoride moisture meters according to claim 1 or 2, characterized in that the pressure gauge ( 15 ) and the cycle pressure gauge ( 11 both are positive pressure two-purpose vacuum pressure gauges; the gas reservoir ( 1 ), the vacuum pump ( 2 ), the calibration chamber ( 3 ) and the cycle pump chamber ( 4 ) are mounted on a movable cart tray.

Images