|
|
|
|
|
|
|
vbvbvvbvvbvbvbvbv |
|
|
The Integrated Power Supply For Indian Railways |
|
|
|
The IPS system is a custom-built solution to feed various ckts of the entire
Railway signaling system. The Power supply requirements of the signalling system
are both AC and DC power of varying voltage and power. In addition to above the
said power supply has to with stand hostile environmental conditions like temp,
humidity, dust, vibration, high surges on incoming lines. Catering to all these,
the STATCON’s IPS are designed to give reliable power for various outgoing
circuits. It is designed to withstand the rigorous environmental conditions and
still provide flexibility to the user for varying application to the extent that
each IPS is configured and manufactured to meet - particuler station load
requirements. A typical block schematic of an IPS system is shown blow:- |
|
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
The block drawing shown above depicts basic elements of an IPS
system and their interconnection. The single phase AC supply is rectified using
Rectifier modules and it feeds to the 110V DC bus. These modules are used in N+1
configuration such that failure of any one module does not hamper working of the
entire system. This 110V DC bus is also used to charge the 110V Battery Bank
connected. |
|
|
|
|
|
|
|
In order to achieve isolated variable DC voltages for various
circuits like Relay Internal, Relay External, Axle counter, SSI, Block
instruments, Block Tele etc. nos. of DC-DC converters are used in N+1
configuration to achieve supply for individual circuits. In case of Ac mains
failure or any one of the DC-DC converter module failure the supply to all DC
ckts remains un-interrupted. In order to get reliable, un-interrupted AC supply
2 Nos. inverters connected in redunttant - mode are used working on 110V DC bus
as shown above. Each inverter gives 230V AC output. The output of the inverter
is extended to signal (and or AFTC circuits as the case may be) circuits through
galvanically Isolated 230V/110V transformer modules. Thus in case of failure of
any one of the inverter, load is automatically transferred to standby inverter.
Provision is made such that in case of failure of both inverters or
Battery failure, the 230V mains can be automatically transferred to
these transformer input automatically. This AC mains is fed through Ferro-
resonant voltage stabilizer (upto 5 KVA AC load) or servo-stabilizer. In order
to cater for track circuit loads (if required) the AC mains is directly fed
through stabilizer or isolation transformers. Failures of all types of modules
is extended as fault signal and is extended to ASM (Asst. Station Master) and
potential free contracts are made available for their remote monitoring. |
|
|
|
|
|
|
|
The battery status is also monitored and potential free contracts
for various state of charge of battery are available which can be displayed at
any remote place (through wire). All modules are easily replaceable and their
status are displayed on front of each module. The whole IPS system is free
standing panel. Depending upon station configuration, the IPS system can be
designed as nos of Rectifier modules, DC-DC converters, Inverter etc. may
change. Lightning and surge protection are provided at incoming AC line. Surge
protection are also provided at 110V DC and all outgoing circuits. The IPS
systems are already in use with Indian Railway and working in more than 450
stations.throughout the length & breath of the country. Various modules of
the IPS are explained below :- |
|
|
|
|
|
|
|
The High Frequency, High Efficiency Compact Rectifier |
|
|
|
 |
STATCON offers SMPS based Rectifier Module of 110V/50Amp capacity. The rectifier module is compact and light
weight module with facility to parallel nos. of them for load sharing.
The SMPS technology allows switching at >80 KHz. frequency. The
unique automatic Power factor correction circuit not only maintains power
factors. close to unity ( ~0.99 ) but reduces. |
|
|
input line current harmonics within 10%. It is designed to work over very wide input voltage range of
150V-275V. The rectifier module is also provided with meter to measure its
output voltage and current. Specially designed filter are used at its input to
suppress EMI/RFI radiation. In addition to above surge suppression circuit is
used both at input and output lines of this rectifier module. |
|
|
|
|
|
|
|
|
High Reliability, Wide range DC-DC Converters |
|
|
|
STATCON offers custom built DC-DC converter modules based on high frequency
technology. Capable of supplying wide output variation in various modules e.g.
12V-40V / 20V-32V / 60V-100V / 44V-65V / 3V-6V DC. The DC-DC Converters are
capable of working over 94V to 135V input DC voltage giving variable outputs.
The high frequency switching technology makes them compact and light weight.
Between input and output galvanic isolation is provided which can upto 1500V.
Individual modules are provided with voltage adjustment potentiometers and
active load sharing circuit in each module enables equal sharing with ± 10%
tolerance while working in parallel. Thus nos. of modules can be used in
parallel to enhance the output power requirement. Protection against under
voltage and over voltage are provided at input while output over voltage
protection is provided in individual module such that the depending upon the
output voltage selected, this over voltage trip level is set at (+) 10%
automatically |
 |
|
|
|
|
|
|
|
|
HSINEWAVE INVERTER MODULES |
|
|
|
 |
Specially designed IGBT based PWM Inverter ckt. is used to give 230V AC, 1Ø,
sine with output. It works our input range of 95V to 135V DC and will trip off
if input goes out of range specified.
The AC output so obtained is well regulated with low distortion and good transient
and overload capabilities. Protection are provided at output and it is full safe
for the (signal SSI) loads connected at its output. In Indian Railway upto 5KVA,
1Ø ratings are used however high ratings in both 1Ø and 3Ø output are also
available as per the requirement. |
|
|
|
|
|
|
|
|
VOLTAGE STABILIZER MODULES |
|
|
|
|
The voltage stabilizer is 1Ø, Ferro-resent volatge stabilizer which is very
nagged in design and provides well regulated and galvanically isolated sineware
output. It gives 230V AC sinusoidal output against 160V - 270V varying AC
supply. It provide overload and short ckt protection at ouput. |
 |
|
|
|
|
|
|
|
|
ISOLATION TRANSFORMER MODULES |
|
|
|
 |
This isolation transformer module available in 500VA, 1000VA, 1500VA, 2500VA,
3000VA and 3500VA is used to give galvanically isolated 110V AC from 230V AC
line.
It is high efficiency transformer with very low no load current and good
regulation. Tappings are also provided on primary and secondry so as to adjust
the output upto the signal post. |
|
|
|
|
|
|