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NG10 - Manual - 01 - 2015
INTRODUCTION
Product identification
Each device is equipped with:
• Identification label installed on the front side with following informations: code number, phase and
residual nominal currents, auxiliary voltage range and CE mark:
• Connection diagram
• Test label with following informations: data, serial number and test operator signature.
Environment
The NT10 device must be employed according to the environment conditions shown (see technical
data).
In case of different environment conditions, appropriate provisions must be provided (conditioning
system, humidity control, etc...).
If contaminants are present (dust, corrosive substances, etc...), filters must be provided.
Graphical conventions
The CEI/IEC and ANSI symbols is employed where possible:
e.g.: 51 = ANSI code concerning the overcurrent element.
Following text formats are used:
The ThyVisor
[1]
menu:
Phase overcurrent -50/51
The parameter description (measures, thresholds, operate time,...) and related value:
I> element
Denitetime
I>def
The display messages (MMI) are shown as:
NG10
Notes are highlighted with cursive letters inside colored bar
Note: Useful description note
Glossary/definitions
f
n
Rated frequency
I
nH
Relay phase nominal current side H
I
npH
Phase CT primary nominal current side H
I
nL
Relay phase nominal current side L
I
npL
Phase CT primary nominal current side L
I
En
Relay residual nominal current (input 1)
I
Enp
Residual CT primary nominal current
26 Thermometric probe ANSI code
50N/51N-87NHIZ Residual or High impedance restricted earth fault ANSI code
87G-M-L Biased differential ANSI code
64REF Low impedance restricted earth fault ANSI code
87NHIZ Codifica ANSI della protezione differenziale di terra ristretta ad alta
impedenza
BF Breaker Failure ANSI code
74CT CT monitoring ANSI code
74TCS Trip Circuit Supervision ANSI code
52 o CB (Circuit Breaker) Circuit Breaker
52a Auxiliary contact in the breaker that is in the same position as the
breaker. It can be assigned to a binary input to locate the CB position
(Breaker failure and/or CB diagnostic functions). (52a open = CB open)
52b Auxiliary contact in the breaker that is in the opposite position as the
breaker (52b open = CB closed)
DFR Digital Fault Recorder
SER Sequential Event Recorder
SFR Sequential Fault Recorder
ANSI American National Standard Institute
IEEE Institute of Electrical and Electronics Engineers
IEC International Electrotechnical Commission
CENELEC Comité Européen de Normalisation Electrotechnique
K1...K6...K10 Output relays
IMPULSIVO Relè finale programmato con uscita impulsiva
Pulse Output relay with pulse operation
tTR Output relay minimum pulse width
Latched Output relay with latched operation (manual reset) Output relay with
latched operation (automatic reset)
No-latched Output relay with no-latched operation (automatic reset)
CT Current Transformer
Note 1 The graphic interface and the operation of the ThyVisor software are described in the relative chapters
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