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DPT145六氟化硫用濕度密度多參數(shù)變送器

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Vaisala公司推出了一項(xiàng)的創(chuàng)新方案,實(shí)現(xiàn)對(duì)高壓設(shè)備中SF6絕緣性能的在線監(jiān)控

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Vaisala 公司推出了一項(xiàng)的創(chuàng)新方案,實(shí)現(xiàn)對(duì)高壓設(shè)備中 SF6 絕緣性能的在線監(jiān)控。Vaisala 公司的DPT145濕度密度多參數(shù)變送器 結(jié)合了在線露點(diǎn)監(jiān)控和壓力檢測(cè)功能,堪稱連續(xù)實(shí)時(shí)評(píng)估 SF6 絕緣性能的理想工具。
很多開關(guān)和斷路器等電力傳輸和配電設(shè)備使用六氟化硫(SF6)作為絕緣氣體,以防止關(guān)閉開關(guān)時(shí)產(chǎn)生電弧,保護(hù)設(shè)備免出故障。Vaisala DPT145 的直接標(biāo)準(zhǔn)化壓力測(cè)試功能能夠立即發(fā)現(xiàn)任何漏電現(xiàn)象,而其在線露點(diǎn)檢測(cè)功能則能夠針對(duì)潮氣問(wèn)題提供早期警告。潮氣能夠影響絕緣氣體的絕緣性能并使故障機(jī)率快速升高。
Vaisala DPT145 是目前市場(chǎng)上一種能夠在線同時(shí)監(jiān)控7種參數(shù)的電力傳送設(shè)備。該設(shè)備可以直接檢測(cè)露點(diǎn)、壓力和溫度,并計(jì)算濃度、標(biāo)準(zhǔn)化壓力、常壓下露點(diǎn)值和PPM值。
由于用一個(gè)設(shè)備即可監(jiān)控7種不同參數(shù),線路系統(tǒng)所需的機(jī)械連接更少,漏電的可能性也更小了。因?yàn)橥顿Y更低,安裝成本更少,現(xiàn)場(chǎng)維護(hù)需求更少等原因,該設(shè)備可全面節(jié)省費(fèi)用,降低消耗。
更重要的是,極其出色的長(zhǎng)期穩(wěn)定性保證了該設(shè)備能夠年復(fù)一年提供可靠的高質(zhì)量檢測(cè)服務(wù),無(wú)須維護(hù)校對(duì)。另外,由于無(wú)須現(xiàn)場(chǎng)取樣檢測(cè),所以 SF6 氣體不會(huì)泄露到空氣中,因此在線監(jiān)控方式也環(huán)保效應(yīng)。
測(cè)量參數(shù): 露點(diǎn):-50...+30°C、壓力:0...10bar和溫度-40...+80°C
計(jì)算參數(shù): SF6密度、標(biāo)準(zhǔn)壓力、常壓露點(diǎn)和ppm

技術(shù)規(guī)格

測(cè)量參數(shù)


Dew point
Pressure, absolute
Temperature
-50 ... +30 °C (-58 ... +86 °F)
1 ... 10 bar (14.5 ... 145 psi)
-40 ... +80 °C (-40 ... +176 °F)


參數(shù)計(jì)算



Pressure, normalized to 20 °C
(68 °F)
1 ... 12 bar (14.5…174 psi)

SF6 or SF6/N2 mixture density
ppm moisture, by volume
Dewpoint, converted to atmospheric pressure

0...100 kg/m3
40 ... 40 000 ppm
-65 … +30 °C (-85 ... +86 °F)

性能



Dew point accuracy
Dewpoint stability

Pressure accuracy at 23 °C (73.4 °F)
Pressure temperature dependence
±3 °C (±5.4 °F)
typical drift < 2 °C (3.6 °F) /5 years
±0.4 %FS
±0.1 %FS/10 °C (18 °F)

Pressure stability
Temperature accuracy
0 ... 40 °C (+32 ... +104 °F)
-40...80 °C (-40 ... +176 °F)
typical drift < 1 %FS /5 years

±0.5 °C (± 0.9 °F)
±1 °C (± 1.8 °F)

Density accuracy (pure SF6, 1 ... 10 bara)
0 ... 40 °C (+32 ... +104 °F)

±1 %FS

-40 ... +60 °C (-40 ... +140 °F)
PPM accuracy, typical (5...1000 ppm, 7 bar)
±2.2 %FS
±( 7 ppm + 15% of reading)

Sensor response time:
Pressure response time
Dew point response time*
63% [90%] at 20°C and 1 bar
-50 -> -10 °C Tdf
-10 -> -50 °C Tdf

< 1 s


5 s [ 10 s]
10 s [ 2.5 min]
​* system equilibrium related response time is typically longer

操作環(huán)境


Operating temperature of electronics
Operating Pressure
Relative humidity
Measured gases

-40 … +60 °C (-40 ... +140 °F)
0 … 50 bar (0…725 psi)
0...100 %
SF6, SF6/N2 mixture

輸出


Digital output

Connector

RS-485, non-isolated, Vaisala protocol
4-pin M8

其他

​Sensor

Operating voltage
​Vaisala MPS1 multiparameter sensor
15 ... 28 VDC
​ ​ 20 ... 28 VDC in cold temperatures (-40 ... -20 °C (-40 ... -4 °F))
​Supply current, during normal measurement
during self-diagnostics
Housing material
Housing classification
​20 mA
max. 300 mA pulsed
AISI316L
IP65 (NEMA4)
​ ​ Weather shield to be used for continuous outdoor installations
​Storage temperature range
transmitter only
shipment package
Mechanical connection

-40 … +80 °C (-40 ... +176 °F)
-20 … +80 °C (-4 ... +176 °F)
DILO DN20, ABB Malmkvist, or
Alstom G1/2” compatible connector
​ ​ Every connection is helium leak tested at the factory
​Dimensional drawings

Weight (with DILO adapter)
​See the document B211165EN-A
765 g (27.0 oz)
​ ​Complies with EMC standard EN61326-1, Electrical equipment for
measurement, control and laboratory use - EMC requirements;
​ Industrial environment, Tested levels
EN/IEC 61000-4-2, Electrostatic Discharge
EN/IEC 61000-4-3, RF field immunity
EN/IEC 61000-4-4, Electric Fast Transient
EN/IEC 61000-4-5, Surge



EN/IEC 61000-4-6, Conducted RF Immunity

Mechanical vibration
EN/IEC 60068-2-6, Fc Sinusoidial vibration


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