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Components and technical solutions for power electronics

Electronic technology voltage sensors

VS sensors

1 - Reminder of the key elements

Formulas: | Abbreviations | |

V _{M} = R_{M} x I_{S} and U_{PN}/I_{SN}=U_{P}/I_{S} VS50 ... VS1500: ● R _{M} = [(0,8 x V_{AMIN}) / I_{S}] - 55● U _{HT+} + U_{HT-} ≤ 4.2 kV peak and | U_{HT+} - U_{HT-} | ≤ U_{PMAX}VS2000 ... VS4200 : ● R _{M} = [(0,8 x V_{AMIN}) / I_{S}] - 60● U _{HT+} + U_{HT-} ≤ 10 kV peak and | U_{HT+} - U_{HT-} | ≤U_{PMAX} | U |

**Reminder of the sensor electrical connection2 - Measurement circuit calculation (secondary part of the sensor)**

U_{PN} = 1000V |

I_{SN} = 50mA |

V_{A} = ±24V (±5%) |

U_{PMAX} = 1500V |

I_{S} = I_{SN} x U_{PMAX} / U_{PN} | = 0,050 x 1500 / 1000 | i.e. I_{S} = 75mA |

R_{M} = V_{M} / I_{S} | = 10 / 0,075 | i.e. R_{M} = 133,33Ω |

V_{AMIN} = 24 x 0,95 = 22,8V | ||

R_{M} = [(0,8 x V_{AMIN}) / I_{S}] - 55 | = [(0,8 x 22,8) / 0,075] - 55 | i.e. R_{M} = 188,2Ω |

We therefore verify that the sensor can measure this 1500V voltage since the measuring resistance with a ±24V (±5%) supply is 188.2Ω for 133.33Ω required.

A VS1000B sensor can measure a peak of 1500V in the following conditions:

V

R

In the same way as for closed loop Hall effect current sensors (see page 109), if the required measuring voltage is reduced, carefully check that the ±15V (±5%) supply used in this example is sufficient to obtain a 5V signal with the conditions used in the preceding point.

R_{M} = V_{M} / I_{S} | = 5 / 0,075 | i.e. R_{M} = 66,67Ω |

R_{M} = [(0,8 x V_{AMIN}) / I_{S}] - 55 | = [(0,8 x 14,25) / 0,075] - 55 | i.e. R_{M} = 97Ω |

We therefore verify that the sensor measures this 1500V voltage since the measuring resistance with a ±15V (±5%) supply is 97Ω for 66.67Ω required.

An electronic voltage sensor is also sensitive to the thermal aspect.In general, a VS voltage sensor can continuously withstand up to 150% of the nominal primary voltage, but only under certain conditions.In all these cases, we recommend that you contact your distributor in order to obtain detailed information on this subject.

The electronic voltage sensor design means that the maximum operating temperature influences the sensor's performance, notably the measurement accuracy. However there is no correlation between a reduction in the ambient temperature and an increase in the voltage to be measured.

In general, the higher the supply voltage, the higher the measuring voltage. The thermal aspect of the sensor should be considered.NB: for calculations with unipolar supply (e.g. 0...+24V), contact your distributor.

First condition | U

Second condition U

The VS1000B sensor cannot therefore be used to measure this 900V d.c. primary differential voltage (even though this differential voltage is lower than the nominal primary voltage of the VS1000B sensor).

For this application the VS2000B sensor can be used since:

U

The condition U