Download DC Network Analyzer

DC NETWORK ANALYZER
MD E
INTRODUCTION :
The DC network analyzer is design to analyze the fault currents in power system. The symmetrical and
unsymmetrical fault analysis can be done with help of analyzer. The unit comprises with variable power supply
sources, variable resistance, Milliammeter and ohmmeter. The unit is design with number of sections in power
system. The sections are considered for general case. The unit will have two sections of alternators, two
sections of sending end transformers with busbars, four sections of transmission lines, four sections of receiving
end transformers with busbars and four load sections.
The fault impedance diagram can be prepared on per phase basis for symmetrical faults and currents are
calculated. The same can be analyzed with dc network analyzer panel. For the unsymmetrical faults, the
sequence reactance diagrams are prepared and the positive, negative & zero sequence reactance diagrams
are connected in series or parallel according to type of fault for fault current analysis. The DC network analyzer
will give the simulated fault current in agnitude but the exact phase can not be found. The assumption is made
that fault resistance is very small than the reactance. (i.e. Rf <<< XF) So the fault current is pure reactive &
logging behind the phase voltage by 90. For analyzing currents with its phase and magnitude the AC network
analyzer is required. The DC network analyzer is simple to operate, easy to understand and full proof with
protections. The power supply units in analyzer can be independently used for other applications also. The
power supply manual is enclosed separately.
The DC network analyzer unit is totally enclosed, free standing, dustproof. The unit powder coated and screen
printed for different section parameters.
MD E
DC NETWORK ANALYZER
ELECTRICAL SPECIFICATIONS :
Input Auxiliary Supply
:
230V +/- 10%, 1-Ph, 50Hz AC Supply.
Base quantities
(To be assumed for fault analysis)
:
a) Base KVA
= 20 MVA.
b) Base KV
= 200 KV.
c) Base independence = 2000 ohms.
No. of sections for analyzer
Short circuit protection.
:
:
Digital Ohmmeter.
a) Alternators.
= 2 nos.
b) Busbars & T/F's at SE
= 2 nos.
c) Transmission lines.
= 4 nos.
d) Busbars & T/F at RE
= 4 nos.
e) Load parameters.
= 4 nos.
With HRC fuses at input, control & output.
0-2K/20K, 3½ digit, 96X96 sq.mm.
M D Electricals make
D.C. voltage source.
:
0-30 V/ 0-1A Dual DC power supply with CV/CC mode
operation, MDE make.
Variable resistances.
:
Digital Millimeters
0-2000 ohms, 10 Turn pot. => 16 nos.
0-200 mA, 3½ digit, 68x30 sq.mm => 8 nos.
Digital Voltmeters
:
0-20 volt , 3½ digit, 68x30 sq.mm. => 01 no
Luminous Main Switch
:
Selector switch with NO elements with bulb & series resistance
assembly
Fuses
:
NSH20/2A, EE make
Terminals
:
BTI15 terminal pairs for each component
MECHANICAL DIAMENSIONS:
SIZE
: 800 x 400 x 1000 mm ( L x D x H )
WEIGHT : 120 Kg.
For more details please contact :
M D ELECTRICALS
Office/works: 50/16,VadgaonNarhe Road, Narhe, Pune 411 041. Tel. : 91-020-24393922
Tel fax. : 91- 020-2439 3407. Email. : [email protected] Wesbite : mdelectricals.com
Subjected to change without notice