VT比壓器／CT比流器分析儀

新型功能強大的DV Power  VT比壓器／CT比流器分析儀， 配備10.1 吋大觸控顯示幕，是測試技術的一次革新，可為比流器(CT)、比壓器／(VT) 和電容式比壓器 (CVT) 的全系列測試提供用戶友好界面快速測試執行。CVA500 可同時測量 CT 拐點電壓、匝數比、極性和所有抽頭的繞組電阻。

自動測試功能可在一次測試中執行所有這些測量，包括 CT 消磁、絕緣電阻和負載測試，無需操作人員干預。這大大縮短了測試時間，並有助於避免人為操作可能造成的問題。

CT 拐點電壓（飽和）測試方法是使用可調的 50/60 Hz 交流電壓（最高 2000 V）。CVA500 將市電頻率（50 或 60 Hz）的正弦電壓直接施加到低壓 CT 端子上。

儀器應用

儀器應用清單包括以下各種測試：

• CT 的飽和曲線與拐點。
• 對 CT、VT 和 CVT 進行匝比、極性和相位角測試。
• 消磁。
• CT、VT 和 CVT 的絕緣電阻。
• CT、VT 和 CVT 的繞組電阻。
• CT、VT 和 CVT 負載測試。

Mains Power Supply

• Connection: according to IEC/EN60320-1;
  UL498, CSA 22.2
• Input voltage: 90 – 264 V AC
• Input frequency: 50 or 60 Hz

Output AC Source

• Up to 2000 V AC (Ratio and saturation test)
• 1 A or 5 A AC (CT burden test)
•  Up to 110 V AC (VT/CVT burden test)

Output DC Source

• 500 V or 1000 V DC (Insulation resistance
• test)
• Up to 5 A DC (Winding resistance test)
• Turns Ratio
• Measurement range: 0.8 – 20000
• Resolution: 5 digits
• Typical accuracy:
  0.8 – 2 000: ±0.02%
  2 000 – 5 000: ±0.03%
  5 000 – 20 000: ±0.05%

Phase Angle

• Measurement range: 0 – 360º
• Resolution: 0.01º
• Typical accuracy: ±0.05º

Saturation (Knee Point)

• Voltage measurement range: 0 – 2100 V
• Resolution: 0.1 V
• Typical accuracy:
  ±0.05% @ ≥ 5 V
  ±0.5% @ < 5 V
• Current measurement range: 0 – 1 A / 10 A
• Resolution:
  0.1 mA @ < 1 A
  1 mA @ ≥ 1 A
• Typical accuracy: ±(0.05% rdg +0.05% FS)

Winding Resistance (CT, VT, CVT Secondary)

• Measurement range: 0 – 999.9 Ω
• Resolution: 4 digits
• Typical accuracy: ±(0.2% rdg + 2 mΩ)

​Winding Resistance (VT Primary)

• Measurement range: 0 – 99.99 kΩ
• Resolution: 4 digits
• Typical accuracy: ±(0.2% rdg + 2 Ω)

Insulation Resistance

• Measurement range: 0 – 20 GΩ
• Range / resolution:
  0 – 99.99 MΩ 0.01 MΩ
  100.0 – 999.9 MΩ 0.1 MΩ
  1000 – 20000 MΩ 1 MΩ
• Typical accuracy:
  ±(3% rdg + 0.2 per GΩ) @ 1000 V DC
  ±(3% rdg + 0.4 per GΩ) @ 500 V DC

Burden (CT)

• Voltage measurement range: 0 – 45 V
• Resolution: 0.001 V
• Typical accuracy:
  ±0.05% @ ≥ 5 V
  ±0.5% @ < 5 V
• Current measurement range: 0 – 1 A / 7 A
• Resolution: 0.001 A
•  Typical accuracy: ±(0.05% rdg +0.05% FS)

Burden (VT, CVT)

•  Voltage measurement range: 0 – 300 V
• Resolution: 0.001 V
• Typical accuracy:
  ±0.05% @ ≥ 5 V
  ±0.5% @ < 5 V
• Current measurement range: 0 – 1 A / 7 A
• Resolution: 0.01 mA
• Typical accuracy: ±(0.05% rdg +0.05% FS)

Display

• 10.1” graphical touch screen display

PC Interface

• USB
• Ethernet

Internal Memory

• SD card 32 GB

Environmental Conditions

•  Operating temperature:
  -20 ºC – +55 ºC / -4 ºF – +131 ºF
• Storage & transportation:
  -40 ºC – +70ºC / -40 ºF – +158 ºF
• Humidity: 0% – 95% relative humidity, noncondensing

Dimensions and Weight

• Dimensions (W x H x D): 505 x 257 x 409 mm / 19.9 x 10.1 x 16.1 in
• Weight: 21.4 kg / 47.2 lbs

Printer

• Built-in thermal printer
• Paper width 112 mm / 4.4 in
• Operating temperature: -10 ºC – +60 ºC / +14 ºF – +140 ºF
•  Storage temperature: -20 °C – +70 °C / -4 °F – +158 °F
• Humidity: 10% – 85% relative humidity,non-condensing

Applicable Standards

• Installation/Overvoltage category: II
• Pollution degree: 2
• Safety: LVD 2014/35/EU (CE Conform)
• Standard EN 61010-1:2010
• EMC: Directive 2014/30/EU (CE Conform)
• Standard EN 61326-1:2013

The new powerful DV Power Current and Voltage Transformer Analyzer CVA500 with a large 10.1-inch touch screen display represents an evolution testing technology that provides user-friendly and fast test execution of the full range of current transformer (CT), voltage transformer (VT), and capacitive voltage transformer (CVT) tests.

CVA500 simultaneously measures CT knee point, turns ratio, polarity, and winding resistance in all taps. The automated test feature performs all these measurements in one test, including CT demagnetization, insulation resistance, and burden test, without any operator intervention. This significantly reduces testing time and helps to avoid possible issues caused by operators.

The CT knee point (saturation) testing method uses the variable 50/60 Hz AC voltage (up to 2000 V). CVA500 applies a sinusoidal voltage at mains frequency (50 or 60 Hz) directly to the low-voltage CT terminals.

Application
The list of instrument application includes a full range of tests:

• Saturation curve and knee point for CTs
• Turns ratio, polarity, and phase angle tests for CTs, VTs, and CVTs
• Demagnetization
• Insulation resistance for CTs, VTs and CVTs
• Winding resistance for CTs, VTs and CVTs
• Burden test for CTs, VTs, and CVTs

Mains Power Supply

• Connection: according to IEC/EN60320-1;
  UL498, CSA 22.2
• Input voltage: 90 – 264 V AC
• Input frequency: 50 or 60 Hz

Output AC Source

• Up to 2000 V AC (Ratio and saturation test)
• 1 A or 5 A AC (CT burden test)
•  Up to 110 V AC (VT/CVT burden test)

Output DC Source

• 500 V or 1000 V DC (Insulation resistance
• test)
• Up to 5 A DC (Winding resistance test)
• Turns Ratio
• Measurement range: 0.8 – 20000
• Resolution: 5 digits
• Typical accuracy:
  0.8 – 2 000: ±0.02%
  2 000 – 5 000: ±0.03%
  5 000 – 20 000: ±0.05%

Phase Angle

• Measurement range: 0 – 360º
• Resolution: 0.01º
• Typical accuracy: ±0.05º

Saturation (Knee Point)

• Voltage measurement range: 0 – 2100 V
• Resolution: 0.1 V
• Typical accuracy:
  ±0.05% @ ≥ 5 V
  ±0.5% @ < 5 V
• Current measurement range: 0 – 1 A / 10 A
• Resolution:
  0.1 mA @ < 1 A
  1 mA @ ≥ 1 A
• Typical accuracy: ±(0.05% rdg +0.05% FS)

Winding Resistance (CT, VT, CVT Secondary)

• Measurement range: 0 – 999.9 Ω
• Resolution: 4 digits
• Typical accuracy: ±(0.2% rdg + 2 mΩ)

​Winding Resistance (VT Primary)

• Measurement range: 0 – 99.99 kΩ
• Resolution: 4 digits
• Typical accuracy: ±(0.2% rdg + 2 Ω)

Insulation Resistance

• Measurement range: 0 – 20 GΩ
• Range / resolution:
  0 – 99.99 MΩ 0.01 MΩ
  100.0 – 999.9 MΩ 0.1 MΩ
  1000 – 20000 MΩ 1 MΩ
• Typical accuracy:
  ±(3% rdg + 0.2 per GΩ) @ 1000 V DC
  ±(3% rdg + 0.4 per GΩ) @ 500 V DC

Burden (CT)

• Voltage measurement range: 0 – 45 V
• Resolution: 0.001 V
• Typical accuracy:
  ±0.05% @ ≥ 5 V
  ±0.5% @ < 5 V
• Current measurement range: 0 – 1 A / 7 A
• Resolution: 0.001 A
•  Typical accuracy: ±(0.05% rdg +0.05% FS)

Burden (VT, CVT)

•  Voltage measurement range: 0 – 300 V
• Resolution: 0.001 V
• Typical accuracy:
  ±0.05% @ ≥ 5 V
  ±0.5% @ < 5 V
• Current measurement range: 0 – 1 A / 7 A
• Resolution: 0.01 mA
• Typical accuracy: ±(0.05% rdg +0.05% FS)

Display

• 10.1” graphical touch screen display

PC Interface

• USB
• Ethernet

Internal Memory

• SD card 32 GB

Environmental Conditions

•  Operating temperature:
  -20 ºC – +55 ºC / -4 ºF – +131 ºF
• Storage & transportation:
  -40 ºC – +70ºC / -40 ºF – +158 ºF
• Humidity: 0% – 95% relative humidity, noncondensing

Dimensions and Weight

• Dimensions (W x H x D): 505 x 257 x 409 mm / 19.9 x 10.1 x 16.1 in
• Weight: 21.4 kg / 47.2 lbs

Printer

• Built-in thermal printer
• Paper width 112 mm / 4.4 in
• Operating temperature: -10 ºC – +60 ºC / +14 ºF – +140 ºF
•  Storage temperature: -20 °C – +70 °C / -4 °F – +158 °F
• Humidity: 10% – 85% relative humidity,non-condensing

Applicable Standards

• Installation/Overvoltage category: II
• Pollution degree: 2
• Safety: LVD 2014/35/EU (CE Conform)
• Standard EN 61010-1:2010
• EMC: Directive 2014/30/EU (CE Conform)
• Standard EN 61326-1:2013