Thytronic NC20 User Manual

6
6
NC2 0 - Manual - 01 - 2015
PREFACE
Product identifi cation
Each device is equipped with:
Identifi cation label installed on the front side with following informations: code number, phase and
residual nominal currents, auxiliary voltage range and CE mark:
Test label with following informations: data, serial number and test operator signature.
Environment
The NC20 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 ThySetter
[1]
menu:
Phase overcurrent -50/51
The parameter description (measures, thresholds, operate time,...) and related value:
I> element
Defi nite time
I>def
The display messages (MMI) are shown as:
NC20
Notes are highlighted with cursive letters inside colored bar
Note: Useful description note
Glossary/defi nitions
I
En
Relay residual nominal current
I
Enp
Residual CT primary nominal current
I
n
Relay phase nominal current
I
np
Phase CT primary nominal current
I
Nn
Relay unbalance nominal current
I
Nnp
Unbalance CT nominal primary current
27 Undervoltage ANSI code
46 Phase unbalance overcurrent ANSI code
46N Neutral unbalance overcurrent with inherent unbalance compensa-
tion ANSI code
49 Thermal image (for series reactor) ANSI code
50/51 Fundamental phase overcurrent ANSI code
50/51 RMS RMS phase overcurrent ANSI code
50N/51N Computed residual overcurrent ANSI code
59 Overvoltage ANSI code
TD Discharge Timer
BF Circuit breaker failure ANSI code
74CT CT supervision ANSI code
74TCS Trip Circuit Supervision ANSI code
DFR Digital Fault Recorder (Oscillography)
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
Note 1 The graphic interface and the operation of the ThySetter software are described in the relative chapters
•
•
NC20#JA2MMB0
I
n
U
AUX
110-230 Vac/dc
100V
5A
I
En
I
Nn
U
n
1A 1A
5A 1A
5A
5A 1A
5A
1
2
3
4
5
NC20#JA2MMB0
I
n
U
AUX
110-230 Vac/dc
100V
5A
I
En
I
Nn
U
n
1A 1A
5A 1A
5A
5A 1A
5A
1
2
3
4
5

Thytronic NC20 Specifications

General

Brand	Thytronic
Model	NC20
Category	Power distribution unit
Language	English