Voltage detectors
BL-M
The two-pole resistive BL-M type voltmeter is designed to precisely and directly measure phase-to-earth voltages in three-phase medium voltage distribution networks of 10 – 24 kV / 50 Hz. Measured voltages are digitally displayed up to 19.99 kV. Thanks to its accurate measurement feature, the BL-M device can also be used for voltage calibration.
The device is designed and built in accordance with IEC 61243-2. It is intended for the use on switchgears, transformers and other medium voltage applications. This device cannot be used as voltage detector according to EN 50110-1!
The structural design is based on the proven BL series voltage detectors which have been providing many years of reliable service. As with the predecessor model, the BL-M device offers the user easy and advantageous handling, dismounting and transportation capabilities.
A calibration and maintenance test is recommended on the basis of IEC 61243-2 in a cycle of 2 years.
- Two-pole resistive voltmeter
- Designed for direct measurement of alternating voltages in medium voltage distribution networks of 0.01 – 19.99 kV / 50 Hz
- Accuracy >99 %
- Application on medium voltage switchgears, transformers
Technical specifications
| Dry conditions | --- |
|---|---|
| Dry and wet conditions | - |
| Indication | Display |
| Nominal frequency | 50 – 60 Hz (optional 16.7 Hz) |
| Measuring range | 0,01 – 19,99 kV AC (RMS) |
| Resolution | 0.01 kV |
| Measurement uncertainty | ±1 %, ±1 Digit |
| Indication "Ready" | 10 min. |
| Total length | 2,340 mm |
| Insertion depth | approx. 570 mm |
| Earthing connection cable | Length: 3 m |
| Earthing terminal | Screw-type terminal |
| Power supply | Lithium cell |
| Temperature range | 0 to +50 °C |
