Page 109 - Current & voltage sensors catalog

Questionnaire
Current and voltage sensor selection guide

General Electrical characteristics
The following questionnaires are used to select sensors The electrical characteristics values mentioned in this catalogue
according to the client's requirements. are given for a particular sensor operating point. These values
The characteristics shown in the catalogue are given with may vary, according to the specific technical requirement, in
respect to a defined environment (worst case conditions). the following way:
The technical requirements will not always reach these extreme – The primary thermal current (voltage) (I PN or U PN) may be
limits, and it is possible, following confirmation by us, to propose increased if:
higher maximum electrical or thermal values to those published, - the maximum operating temperature is lower than the
thanks to a knowledge and detailed analysis of the sensor value shown in the technical data sheet
operating environment. - the sensor supply voltage (V A) is reduced
A technical relationship between the client and ABB will allow - the load resistance value (R M) is increased
the proposal of the best selection of sensors, equally from the – The maximum current (voltage) measurable by the sensor
viewpoint of performance and economy. may be increased if:
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- the maximum operating temperature is lower than the
Two principal areas are considered in the selection of a sensor: value shown in the technical data sheet
– the electrical aspect - the sensor supply voltage (V A) is increased
– the thermal aspect - the secondary winding resistance value (R S) is reduced
The sensor performance is based on a combination of electrical (e.g. by using a lower transformation ratio)
and thermal conditions; any values other than those indicated - the load resistance value (R M) is reduced
in this catalogue cannot be guaranteed unless validated by us.
The information below is only valid for sensors using closed
loop Hall effect technology. Thermal characteristics
The operating temperature values mentioned in this catalogue
Contact your local supplier for other technologies. are given for a particular sensor operating point. These values
may vary, according to the specific technical requirement, in
the following way:
Profile mission – The maximum operating temperature may be increased if:
Due to the design of converters with integrate more power with - the primary thermal current (voltage) (I PN or U PN) is reduced
less volume, sensors are very constraint; leading to reduce - the sensor supply voltage (V A) is reduced
their life time. As a matter of fact, even though the application - the load resistance value (R M) is increased
main conditions are well within the sensors characteristics, PS: The minimum operating temperature cannot be lower than
these conditions have an impact on the sensor life time. that shown in the technical data sheet as this is fixed by the
lower temperature limit of the components used in the sensor.
The main general characteristics that involves the sensors life
time are the following:
– the ambient temperature above 40 °C. It is usually said that
every additional 10 °C, the life time is reduced by a factor
of 2. Of course, this value is a theoretical value and has to
be defined in line with the concerned project.
– the ambient temperature variations also impact the sensor
life time. Even small variations (like 10 °C) can change the
life time of the sensor especially on the electronic part.
– the way the sensors are used also impact its duration (numbers
of ON/OFF per day, average current or voltage value, power
supply value, load resistor value, vibrations levels…)

The above general impacting conditions are well defined in
standards like IEC 62380, UTE C 80-810 and must be consider
during any new converter design.
1SBC140074S0201
ABB can provide theoretical reliability calculation based on
specific profile mission of your projects.

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