High Current Rectifier
Vinit Electronics & Electricals manufacturers high quality
automatic & manual transformer rectifier units HCR (TRU) required
for catholic protection applications of buried structures, storage
tanks at storage terminals /refineries and cross country pipelines
which is critical to the hydrocarbon sector of any country. The HCR
(TRU) are rugged in construction, designed to withstand the harsh and
unattended conditions they operate in. We have a large, modern and
well-equipped design & manufacturing facility, highly, experienced
team ensures reliable and quality products capable of meeting exacting
delivery schedules. We have several types of HCR (TRU) designs
validated and operational in the fields for several years, all vital
components of the units like transformers, rectifier stacks, controls
cards are manufactured under stringent quality assurance system to
achieve highest quality standards. Vinit Electronics & Electricals
offers a great deal of flexibility in custom designing of units to suit
specific field requirements, while maintaining high quality standards
and meeting quick delivery schedules.
The HCR (TRU) have been approved by all the reputed consulting /
independent inspection agencies in India. More than hundred automatic
& manual units are in operation in India and other countries, all
these units have proved their performance & reliability in the
field service to the complete satisfaction of customer, constant
customer training sessions ensure that product knowledge is shared with
all customers to derive maximum benefits.
Vinit Electronics & Electricals specializes in manufacturing
special and high power rectifiers for variety of applicatons. It
designs, manufacturers and tests integrated high power transformer
rectifiers are enumerated below.
- Power Supply for Cathodic Protection of buried pipeline and structures.
- Industrial Processes such as Electro-Winning, Electro-Rectifining and Electro-Plating.
- Hydrogenation and Chlorination.
- Rectifiers for Electro Static Precipitators.
- EMU / DMU Rectifiers.
- Battery Chargers.
The division has capabilities to offer simple diode based rectifiers as
well as highly reliable SCR / IGBT based rectifiers with robust analog
and digital control designs these are designed in 6, 12, 18 and 24
pulse systems that offer reduced supply side harmonic content, reduced
output ripple and improved regulation, the products offered are also
designed for operations in hazardous areas and have facility for
interfacing with customer SCADA systems Cathodic Protection rectifiers
are in operation using remote monitoring and control facility with its
design capabilities the remote monitoring and control data can be
transmitted over GSM and dedicated fibre optic links.
The
state-of-the-art facility for design, engineering and testing ensure
very high product reliability, given their critical applications, the
division provides full systems with auxiliary equipment's like
switchgear, power factor correction and harmonictiter.
Features Controls:
Variac Controlled:
The working of the rectifier can be controlled using a stepless variac
and the output can be controlled from zero to the rated value.
Static Variac Controlled:
The working of rectifier can be controlled smoothly using back-to-back
thyristor at input side by controlling the firing angle of thyristor,
output of rectifier can be controlled.
Thyristor Controlled:
The rectifier output can be controlled using thyristor as secondary of
the transformer the thyristor rectifier can be provided with 6, 12, or
24 pulse configuration.
Type of Cooling:
The cooling system si designed to ensure highly reliability and optimum
performance of the rectifier in high atmospheric temperature and in
highly corrosive conditions, Natural Oil cooled (ONAM) is recommended.
In this system vital components like transformer choke diodes etc. are
immersed in an oil tank for cooling if the rectifiers are placed in a
room with proper ventilation, then "natural air cooled scheme can be
displayed for rectifiers of high rating "forced Air cooling" is
preferred. Under this system, the internal components are cooled using
a blower fan.
Transformer:
The transformer used in the units are rugged and of robust
construction. They are used to step up or step down the input supply,
they are available in both oil cooled as well as air cooled / forced
cooled type In hexa phase rectifier units, an inter phase transformer
is used. It is connected between two star points of the secondary of
main transformer.
Protection:
Following Protection Schemes are generally deployed :
- Electric DC over voltage / over current
- Semiconductor fuses for rectifiers
- MCB / MCCB at Input or Output
- Snubber circuits for devices
- Temperature control for devices and transformer
- Phase sequence and phase loss protection
Digital Controller :
The unit can also be controlled through a digital controller.
The digital controller consists of a keypad for operation.
And an LCD screen for display of various parameters.
The digital controller is used in control schemes where precise control is required the digital controller is.
Equipped with an RS 232/485 interface for external communication.
| I/p Voltage |
415V +/- 10%, 3 ph, 50 Hz |
| O/p Voltage |
Up to 500 V or as per customer requirements |
| O/p Current |
Up to 50 KA or as per customer requirements |
| Ripple |
Up to 5% at rated load or as per customer requirements |
| Efficiency |
For Thyristor controlled units above 90%. For Variac controlled units above 87% |
| Protection |
MCCB at input supply
Over temperature for transformer & power devices
Semiconductor fuses for power devices
Voltage transient protection for devices
Output short circuit |
| Enclosures |
Indoor / Outdoor units with Ingress Protection upto IP 65 |
| Cooling |
ONAN / Forced Air / Natural Aircool
Standard conforming to IS-4540 standard rectifier & IS 2026 standard for transformer |
| Indication |
Three phase pilot tamps (LED type)
Digital DC voltmeter and Ammeter with external PLC signals
(MIMIC) as per with external SCADA signals required interface |
| Salient Features |
Five limb core or IPT construction for compact size
Fully tropicalised design
Unit rated for continuous duty
Microprocessor based controller for better reliability |
| Ambient Temperature |
50°C |
| Relative Humidity |
95% |
All the above information including drawings, illustrations & graphic design is to the best of our knowledge & belief.
Users should independently evaluate the suitability of product for
desired application. Specifications are subject to change without
notice.
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