Sonel DB-1 Manuel utilisateur

USER MANUAL

DEMONSTRATION BOARD

DB-1

SONEL S. A.

Wokulskiego 11

58-100 Świdnica

Poland

Version 2.0027.05.2022

DB-1 –USER MANUAL

CONTENTS

1Safety ................................................................................................................4

2Application .......................................................................................................5

3The front panel.................................................................................................6

3.1 Arrangement of sockets and switches .....................................................................6

3.2 Position of switches ................................................................................................. 7

4Measurements..................................................................................................8

4.1 Measurement of the short circuit loop impedance ...................................................8

4.1.1 Measurement of the short circuit loop impedance in the L-PE circuit ................................8

4.1.2 Measurement of the short circuit loop impedance in the L-N circuit.................................10

4.2 Measurement of the parameters of the RCD switch ..............................................11

4.2.1 Realisation of measurements of the RCD switch parameters.........................................11

4.3 Measurements of the earth resistance...................................................................13

4.3.1 Measurement of the earth electrode resistance using meters of the MRU series............14

a. Earth resistance measurement RE.............................................................................. 14

b. Earth resistance measurement RE1............................................................................. 14

c. Earth resistance measurement RE2 by means of the technical method....................... 15

d. Earth resistance measurement RE2 by means of the technical method using current

clamp.......................................................................................................................... 15

e. Earth resistance measurement RE2 by means of the two-clamp method..................... 16

4.3.2 Measurement of the earth resistance using loop impedance meters...............................16

a. Earth resistance measurement RE.............................................................................. 16

b. Earth resistance measurement RE1 ............................................................................. 17

c. Earth resistance measurement RE2 ............................................................................. 17

4.4 Earth resistivity measurements..............................................................................18

4.5 Measurements of the continuity of equipotential bondings ....................................19

4.5.1 Measurement of the resistance of the equipotential bonding between P1 and P2...........19

4.5.2 Measurement of the resistance of equipotential bonding between P1 and P3.................19

4.6 Insulation resistance measurement .......................................................................20

4.6.1 Insulation resistance measurements in the L-N circuit ....................................................20

4.6.2 Insulation resistance measurements in the L-PE circuits ................................................21

5Replacement of fuses....................................................................................21

6Cleaning and maintenance ...........................................................................22

7Dismantling and disposal .............................................................................22

8Technical specifications ...............................................................................22

9Standard accessories....................................................................................22

10 Manufacturer ..................................................................................................23

DB-1 –USER MANUAL

1 Safety

The DB-1 demonstration board has been designed for the purpose of simulation of measurements,

whose results determine the safety conditions of a virtual installation. Therefore, in order to guarantee ap-

propriate operation and correctness of the obtained results, the following recommendations must be fol-

lowed:

Before you proceed to operate the device read thoroughly the present manual and observe the safe-

ty regulations and instructions specified by the manufacturer.

The device has been designed for operation at the nominal voltage of 230 V 50 Hz.

The device cannot be used in the grid and with other devices in special interiors, for example those

of a dangerous atmosphere regarding the risk of explosion or fire.

It is unacceptable to operate the following:

a damaged device which is completely or partially out of order

a device with damaged power cable insulation,

a device stored for an excessive period of time in disadvantageous conditions (e.g. excessive

humidity). If the meter has been transferred from a cool to a warm environment of a high level of

relative humidity, do not perform the measurements until the meter has been warmed up to the

ambient temperature (approximately 30 minutes).

a device with damaged housing.

Before measurement of connection resistance or insulation resistance, make sure the measured ob-

ject has been disconnected from the power supply. Disconnect the power cable of the device from

the power supply contact and turn the RCD off.

Repairs may be performed solely by an authorised service point. Before the device is connected to the

power supply network, make sure the power supply socket is equipped with a properly connected earth

pin. The board will not function if it is powered from a socket without an additional PE connection.

The board is equipped with a protection constituted by two F 4A 250 V fuses (T 3,14A 250 V fuse are

acceptable). The fuses are located in the device power supply socket. Should the fuse elements be

damaged, they must be replaced.

It is unacceptable to use other fuses.

WARNING

The DB-1 demonstration board may be used solely by qualified personnel who

have appropriate certificates that entitle them to work on electric installations, or

by persons working under their supervision. Using the board by unauthorised per-

sonnel or without supervision of such personnel may cause damage of the device

and be a source of a serious danger for the user.

Before the fuses are replaced, the device must be disconnected from the 230 V

power supply network.

NOTE!

Before you proceed to operate the device, read thoroughly the present manual and ob-

serve the safety regulations and instructions specified by the manufacturer.

The demonstration board has been designed for the purpose of simulation measure-

ments of alternating voltage, impedance, short circuit, earth resistance, parameters of

the RCD switch, ground resistivity, insulation resistance, resistance of equipotential

bondings. Any application that differs from those specified in the present manual may

cause damage of the device and be a source of a serious danger for the user.

Before and during measurements of ground resistivity, insulation resistance, resistance

of equipotential bondings, earth resistance (by means of the technical methods) discon-

nect the power cable of the device from the power supply socket and turn the RCD

switch off. The power supply of the board is signalled by the „POWER ON” diode.

DB-1 –USER MANUAL

2 Application

The DB-1 demonstration board is an indispensable element of training courses regarding reali-

sation of electric measurements. It may be applied in schools, distribution centres of meters used in

the power industry as well as in training centres.

The board may be used for the purpose of simulation of the following measurements:

measurement of the short circuit loop impedance in the L-N circuit for the TT and TN networks,

measurement of the short circuit loop impedance in the L-PE circuit for the TT and TN net-

works,

measurement of the parameters of the RCD switch type AC,

insulation resistance measurement in the L-N circuit,

insulation resistance measurement in the L-PE circuit,

measurement of the earth resistance by means of the technical method,

earth resistance measurement using clamps,

earth resistance measurement by means of the two-clamp method,

earth resistance measurements by means of the impulse method,

earth resistance measurements using meters for short-circuit loop measurements,

resistivity measurements of three kinds of ground,

measurement of the resistance of equipotential bondings,

measurement of alternating voltage.

The demonstration board makes it possible to cause irregularities in the installation under scrutiny.

This is possible thanks to the panel switches.

DB-1 –USER MANUAL

3 The front panel

3.1 Arrangement of sockets and switches

Fig. 1. Arrangements of the panel elements of the DB-1 demonstration board

1 Power supply network socket 230 V

2 Additional PE socket

3 230 V power supply signalling diode

4 RCD switch

5 Measurement socket

6 TN network jumper

7 TT network jumper

8 RE1 (ZW RE1) earth electrode jumper

9 Equipotential pipe connection jumper H2O (ZW H2O)

10 RE2 (ZW RE2) earth electrode jumper

11 Measurement points P1, P2, P3, P4, P5

12 Measurement point of the RE1 (E1) earth electrode

13 Measurement point of the RE2 (E2) earth electrode

14 Measurement electrode sockets

15 Irregularity selection switches

16 Ground type switch for ground resistivity measurements

DB-1 –USER MANUAL

3.2 Position of switches

Fig. 2. Position of switches simulating irregularities

in the electric installation of the measured object

1 RE–high earth resistance at P2. RE= 1 kΩ

2 UB–the acceptable voltage value UBhas been exceeded during measurements of the RCD pa-

rameters in the measurement socket. UB> 25 V

3 RISO(L-PE) –low insulation resistance –measurement L-PE. RISO(L-PE) = 200 kΩ

4 RISO(L-N) –low insulation resistance –measurement L-N. RISO(L-N) = 100 kΩ

5 RCD-TA–the acceptable disconnection time of the RCD has been exceeded.

6 ZL–high short circuit loop impedance. ZL≈6 Ω

7 RCD-IA–the activation current of the RCD is lower than the required value (damaged RCD or ex-

cessive leakage current of the installation). The leakage current of the installation IA≈ 15 mA

DB-1 –USER MANUAL

4 Measurements

4.1 Measurement of the short circuit loop impedance

A reliable and the most commonly used method of protection from electric shock consists in

protection from indirect touch in circuits equipped with circuit breakers. The method consists in a au-

tomatic disconnection in the case of fault.

Conductive elements of the device are connected to the protective conductor of the power sup-

ply network. At the moment a hazardous touch voltage appears, which is caused by a metallic short

circuit with the phase conductor of the power supply network, the current will flow in the phase –pro-

tective conductor circuit. The current is called short-circuit current. The passage of the short circuit

current will cause activation of the circuit breakers and the power supply system will be turned off.

The condition that must be met to have the protection level specified for the device as sufficient ap-

proved is that the elements must not be under a dangerous touch voltage for an excessive period of

time. Therefore the safety device must respond quickly, and within the period of time specified in the

relevant norms. The condition of appropriate protection may be expressed by the following equation:



ZS- short circuit loop impedance

IA–current activating the circuit breaker within the required period of time

UO–power supply network nominal voltage in relation to earth

4.1.1 Measurement of the short circuit loop impedance in the L-PE circuit

Measurement of the short circuit loop impedance in the L-PE circuit may be performed using

the MPI-5XX meter in the ZL-PE[RCD] function. Should another meter or function be used, the RCD

switch of the demonstration board may be trigged.

In order to perform the measurement proceed as follows:

connect the 230 V AC power supply network cable to the socket of the demonstration

board,

select the kind of TT or TN network using a jumper in the appropriate position (Figure 3),

all the switches simulating irregularities must be in the „green” position,

turn the RCD switch on,

connect the meter to the power network socket of the board using leads, in accordance

with Figure 4,

perform the measurement

The demonstration board permits to perform measurements of a short circuit loop, whose value

may be artificially overstated (simulation of irregularities). In order to do so, before you proceed to

perform the measurement place the ZLswitch in the „red” position. Having finished the measurement,

place the ZLswitch again in the „green” position.

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