SONEL-DB-1 Demonstration Board

The DB-1 board makes it possible to demonstrate the method

of performing the following tests:

• fault loop impedance for assessment of the automatic power cutoff condition,
• RCD parameters,
• earthing resistance,
• soil resistivity,
• continuity test of equipotential bonding,
• insulation resistance,
• power network voltage.

It is possible to simulate typical failures and irregularities in the electrical network.

Technical specifications of DB-1 board and features of individual

functions:

• Fault loop impedance:

• measurement of L-N short-circuit with impulse currents up to 25 A and 60 ms,

• measurement of L-PE earth fault loop with impulse currents up to 20 mA.
•  RCD parameters (30 mA RCD):
•  measurement of RCD trip time,
•  measurement of RCD trip current,
•  earth resistance measurement,
•  touch voltage measurement.

 Soil resistivity:

resistivity measurement for three soil types (14 Ωm; 300 Ωm; 6.2 kΩm).

Earthing resistance.

Measurement by method:

• two-lead,

• three-lead,

• four-lead,

• three-lead with clamp,

• double clamp,

• with the use of fault loop meter.

•  Continuity of connections:

• measurement of equipotential bonding and connections of accessible parts.

• Insulation resistance:

• measurement of L-N insulation,

• measurement of L-PE insulation,

• measurement of N-PE insulation.

• Voltage measurement:

• voltage measurement in power socket.

•  Simulation of irregularities:

• no continuity of earth conductor (RE),

• safe voltage exceeded during RCD measurement (UB),

• leakage current (IErr),

• insufficient L-N insulation resistance (RISO(L-N)),

• insufficient L-PE insulation resistance (RISO(L-PE)),

• excessive fault loop impedance (ZL).