CESI
LVD
LOW VOLTAGE DIVIDER
SUMMARY
1
GENERAL ..................................................................................................... 3
2
CALIBRATION .............................................................................................. 3
3
REFERENCES .............................................................................................. 4
4
TECHNICAL SHEET ..................................................................................... 4
CESI
Centro Elettrotecnico
Sperimentale Italiano
Giacinto Motta SpA
Via R. Rubattino 54
20134 Milano - Italia
Telefono +39 022125.1
Fax +39 0221255440
www.cesi.it
Capitale sociale 8 550 000 Euro
interamente versato
Codice fiscale e numero
iscrizione CCIAA 00793580150
Registro Imprese di Milano
Sezione Ordinaria
N. R.E.A. 429222
P.I. IT00793580150
Brochure
CESI
Page 3/4
1 GENERAL
The standard IEC 60947-1 “Low voltage switchgear and controlgear – Part 1: General rules” reports
prescriptions for voltage measurement on equipment and systems under test.
Since the voltage level is generally higher than allowed as input to the Data Acquisition System
(DAS), a direct measurement is not possible. Therefore, a low voltage divider is required.
Particularly, in order to increase the bandwidth, the divider must be RC damped.
2 CALIBRATION
CESI delivers each Low Voltage Divider with calibration report, according to CESI internal procedure
94/010774 (Low voltage mixed dividers periodical calibration control).
Figure 1 – LVD front view
CESI
Brochure
Page 4/4
3 REFERENCES
Maximum
voltage
(Vrms)
DC input
resistance
(MΩ
Ω)
1500
>1
CESI
1500
>1
PLN LMK-Jakarta
1500
>1
Bogazici Univ.-Istanbul
1500
>1
LPEE-Casablanca
1500
>1
1500
>1
Client
Country
Year
Q.ty
Italy
1981
4
Indonesia
1997
2
Turkey
1998
2
Morocco
1998
4
LG-Chungcheo
Korea
1999
1
LG-Chungcheo
Korea
2002
1
4 TECHNICAL SHEET
Reference standards
IEC 60950
RATING
DC input Resistance
> 1 MΩ
Maximum rating voltage (phase to ground)
1000 Vrms
Rated power-frequency withstand voltage test
(phase to ground with output branch disconnected)
3000 Vrms
Rated frequency
50÷60 Hz
Number of phases
3 phase + 1 neutral to ground
High voltage branch
51 kΩ ±1% x 20 steps
Low voltage branch
10 kΩ ±1%
Low voltage DC Divider ratio
100 ±0.5%
Max ratio guaranteed deviation
1% from DC to 1 kHz
2% from 1 to 5 kHz
Frequency response
DC to 600 kHz –3 dB
MECHANICAL FEATURES
Dimensions (approx.)
19” width, 2 U height, 400 mm depth - Rack chassis
Weight
7 kg
Degree of protection
IP 40
Ambient operating temperature
5°C ÷ 40°C
Installation
Indoor
Output connector
Insulated BNC
Input connector
Safety Screw-in Sockets
Coaxial Cable
RG 58 C/U - 40 m