Page 13 - Current & voltage sensors catalog

Voltage detection technology

1. Electronic technology
1

Principle
U P+
ABB voltage detector is based on entirely electronic technology. It allows the detection
HT1+ Detector HT2+
of the presence of direct voltages. For safety reasons this main function is duplicated
within the detector to increase the product lifetime. PCB
The voltage detector converts the primary voltage U P applied to its terminals to visual
U P
U P
information for the user. This function permits the user to carry out maintenance
operations with the assurance that dangerous voltage is not present. PCB G0216DG
The primary voltage U P to be measured is applied directly to the detector terminals:
HT1- HT2-
HT1+ and HT2+ (positive high voltage) and HT1– and HT2- (negative high voltage
or 0 V electric). The electronic circuit (PCB) converts the primary voltage U P to an U P-
electrical signal supplied to a light emitting diode (LED). The voltage detector indicates the
The information is supplied to the user visually through two flashing LEDs. presence of a voltage higher than a
The detector does not need an external power supply in order to work. limit (maximum 50 V in compliance
with standards) by the illumination
of a LED. Inversely, the LED is extin-
guished when the voltage is below
this limit.

Advantages Applications
The main advantages of this electronic – Excellent reliability (functional redun- Railway
technology are as follows: dancy in a single product). Main converters, auxiliary converters
– Detection of direct voltages. – Excellent immunity to magnetic fields. (lighting, air conditioning), electronic
– Very good visual indication. – Compact product. power devices integrating capacitors
1SBC140076S0201
– High overload capacities. banks, battery chargers, choppers, sub-
stations, etc.

ABB | 11