DPT145六氟化硫用湿度密度多参数变送器
Vaisala 公司推出了一项独特的创新方案，实现对高压设备中 SF6 绝缘性能的在线监控。Vaisala 公司的DPT145湿度密度多参数变送器 结合了在线露点监控和压力检测功能，堪称连续实时评估 SF6 绝缘性能的理想工具。
很多开关和断路器等电力传输和配电设备使用六氟化硫（SF6）作为绝缘气体，以防止关闭开关时产生电弧，保护设备免出故障。Vaisala DPT145 的直接标准化压力测试功能能够立即发现任何漏电现象，而其在线露点检测功能则能够针对潮气问题提供早期警告。潮气能够影响绝缘气体的绝缘性能并使故障机率快速升高。
Vaisala DPT145 是目前市场上唯一一种能够在线同时监控7种参数的电力传送设备。该设备可以直接检测露点、压力和温度，并计算浓度、标准化压力、常压下露点值和PPM值。
由于用一个设备即可监控7种不同参数，线路系统所需的机械连接更少，漏电的可能性也更小了。因为投资更低，安装成本更少，现场维护需求更少等原因，该设备可全面节省费用，降低消耗。
更重要的是，其出色的长期稳定性保证了该设备能够年复一年提供可靠的高质量检测服务，无须维护校对。另外，由于无须现场取样检测，所以 SF6 气体不会泄露到空气中，因此在线监控方式也具环保效应。
测量参数： 露点:-50...+30°C、压力:0...10bar和温度-40...+80°C
计算参数： SF6密度、标准压力、常压露点和ppm
技术参数 |
测量参数 |
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Dew point Pressure, absolute Temperature |
-50 ... +30 °C (-58 ... +86 °F) 1 ... 10 bar (14.5 ... 145 psi) -40 ... +80 °C (-40 ... +176 °F) |
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参数计算 |
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Pressure, normalized to 20 °C (68 °F) |
1 ... 12 bar (14.5…174 psi) | |
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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) |
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性能 |
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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) |
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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) |
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Density accuracy (pure SF6, 1 ... 10 bara) 0 ... 40 °C (+32 ... +104 °F) |
±1 %FS |
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-40 ... +60 °C (-40 ... +140 °F) PPM accuracy, typical (5...1000 ppm, 7 bar) |
±2.2 %FS ±( 7 ppm + 15% of reading) |
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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] |
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* system equilibrium related response time is typically longer |
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操作环境 |
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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 |
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输出 |
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Digital output Connector |
RS-485, non-isolated, Vaisala protocol 4-pin M8 |
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其他 |
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Sensor Operating voltage |
Vaisala MPS1 multiparameter sensor 15 ... 28 VDC |
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20 ... 28 VDC in cold temperatures (-40 ... -20 °C (-40 ... -4 °F)) | |
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Supply current, during normal measurement during self-diagnostics Housing material Housing classification |
20 mA max. 300 mA pulsed AISI316L IP65 (NEMA4) |
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Weather shield to be used for continuous outdoor installations | |
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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 |
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Every connection is helium leak tested at the factory | |
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Dimensional drawings Weight (with DILO adapter) |
See the document B211165EN-A 765 g (27.0 oz) |
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Complies with EMC standard EN61326-1, Electrical equipment for measurement, control and laboratory use - EMC requirements; |
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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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