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)參數(shù) |
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 | |
