The model 7020 series of Compensated Current Transformers use passive, two-stage-compensated technology. The main advantage of a two-stage-compensated CT is that the effective burden is low when feeding into another compensated CT such as the current input on the model 2010A Wattmeter or Cx & Cxp input to MI 7010 Capacitance Bridge. As a result, the errors of the CT are effectively reduced to zero in both magnitude and phase. Lead length becomes unimportant and there is no further concern for any additional active components.
The model 7020 is supplied as single 2000:1 or 1000:1 ratio device. For other ratios please contact Measurement International at firstname.lastname@example.org. The housing consists of a Formica enclosure for the strength and protection required in industrial environments.
The Model 7020 was originally developed as an extender for the MIL model 2010 Wattmeter where the accuracy over the full-range is important. It is also suitable to be used as a standard current transformer for CT test sets or for measuring range extension for Tan Delta measurements of high capacitance & low inductance values using the model 7010 series of Capacitance Bridge. The model 7020 has 50 % overrange capability.
|Two stage compensated CT||Effectively reduces the CT errors and cabling effects to zero|
|Passive compensation||Does not require any power supply or internal electronics|
|Wide current range||Allows same accuracy within large current span, without range switching|
|Model 7020 Compensated Current Transformer|
|Current Range (A)
(Allows 50% overrange)
|2000 down to 10|
|Nominal Ratio||2000:1 or 1000:1|
|Magnitude Error (parts per 106)||< ± 20|
|Phase Error (µrad)||< ± 20|
|Maximum Burden (Ω)||1|
|Input Connection||4-inch (102 mm) window|
|Output Connection||5-way Binding Post or Locking Connector|
|Mechanical||CT is mounted on wheels for maneuverability|