Converter transformers - Import export

Our mid range frequency converters are delivering up to 250 kW output at frequencies down to 4 kHz. For high frequencies up to 2 MHz we have our high frequency converter series HU.

i/p converter for the electrical control of pneumatic positioners. Suitable for field and switch cabinet assembly. Suitable for remote control of valves in hazardous areas. Also in Ex version II 2 G EEx ib IIC T6.

The DC-voltage converters developed for the electronic components in the motor car are characterised by their ease of installation in every vehicle. The high degree of stability, the compact design, sustained short-circuit resistance as well as the high level of operating safety are the quality hallmarks of this series. The areas of application span the mobile employment of 12-V-consumers in vehicles with a 24-V-onboard network. The devices are particularly suitable for operating car radios, stereo units, radios, cooler units, car telephones, computers, 12-V-trailer lighting etc. The voltage converter converts an input direct voltage into an output direct voltage. The input voltage must be greater than the output voltage. No base load is required at the output end. A 26 kHz PWM switching controller is used for this purpose. Input and output are not isolated. The common earth is connected with the voltage converter housing.

The CSN® HECT, HEVT and HECT/VT by Schniewindt combines proven sensor technology and opticaldigital data transfer according to the standard IEC 6185092, creating a future orientated solution for applications in high voltage AC substations. The required values to be measured are recorded in analog signal form by conventional sensor elements (R/C high voltage divider for voltage measurement and Rogowski coil for current measurement) on HVline potential and transferred to the RemoteDataModule (RDM) mounted in the head construction of the instrument transformer. The RDM converts the recorded data into a digital serial protocol and transmits them via optical fiber to the Merging Unit (MU), located in the control room. The distance between instrument transformer and MU can be up to 1 km. The MU transfers the data protocol of three instrument transformers into the protocol according to IEC 6185092. For signal output

The IEC 6185092 LE Merging Unit is the optimal solution for process bus interfacing. It allows the consolidation of measurements made in the switchyard, feeding protection relays, meters and fault recorders located in the control room. The use of fiberoptical communications makes it inherently safe. By eliminating the majority of copper wiring, the CSN® Merging Unit addresses key technical and logistic challenges affecting the cost of substation design, construction and maintenance. The simple and disturbancefree architecture of the open IEC 6185092 process bus allows operation of relay, meter and faultrecording equipment of different manufacturers on the same bus. The IEC 6185092 LE Merging Unit collects data from conventional instrument transformers and converts the analog signals into a digital protocol

The Regular Collection is available as bridge, half-wave, and bridge/half-wave rectifiers. The bridge/half-wave rectifiers reduce the output voltage after the brake is released. Depending on the selected rated coil voltage of the brake, either a faster switching by overexcitation, a reduction of the electrical power while the brake is released or a combination of both is possible.

These compact half-wave and bridge rectifiers are ideal for installation in space restricted junction boxes of brake motors. They can be delivered with flying leads or terminals for connection. Various accessories are available to meet different installation requirements.

The rectifier with built-in current sensor for fast turn-off is designed for the operation of electromagnetic devices. It ensures fast turn-on and turn-off. The rectifier with bridge circuit comprises a thyristor and timer. During overexcitation, the rectifier delivers bridge rectified output voltage before changing over to half-wave rectification. On the DC side, the output voltage is enabled by the built-in current sensor which measures the AC current of the connected motor. If the motor is stopped, the rectifier turns off on the DC side as soon as the current falls below the turn-off threshold. The turn-off voltage generated by the inductive load is limited. The rectifier is suitable for connection in parallel with AC motors. The current sensor must be wired into the motor current path in such a way that the current flow created when the motor operates in generator mode will not pass through the sensor. This is crucial to avoid delayed or impaired DC side switching.

These half-wave and bridge rectifiers are ideal for installation in the junction boxes of medium-power brake motors, brakes and solenoids. Accessories include flying leads and a range of mounting hardware so that installation on DIN rails is also possible. Encapsulated versions for an extended operating temperature range are available as options. In case of additional DC side fast turn-off, the induction voltage generated by inductive loads is limited within the rectifier.

These overexcitation rectifiers are designed to increase the attractive force and reduce the attraction time of actuating solenoids, to shorten the coupling and disconnection times of clutches and brakes and to decrease the power consumption of clutches, brakes and actuating solenoids. To increase the attractive force, the solenoid is overexcited during the overexcitation time, applying bridge rectified voltage. Then the rectifier changes over to the selected holding voltage which must not exceed the rated voltage of the solenoid.

The compact collection is available as bridge, and half-wave rectifiers in two voltage variants. Two different housing variants allow mounting by screwing or snapping in.

ESM for AC-brakes: The module consists of a time-controlled rectifier with integral electronic fast turn-off. During start-up, the ESM delivers bridge-rectified output voltage before changing over to half-wave rectification. The built-in voltage sensor ensures that the DC side output voltage is interrupted electronically when AC input voltage is removed. Thanks to its compact design, the ESM can be installed in very restricted space. ESM for DC-brakes: The module keeps the voltage supplied to the electromagnetic device at a constant level over a wide input voltage and temperature range. Full operating voltage is applied to ensure fast switching when the load is switched on. The module then reduces the power supply to constant holding voltage. A 30% reduction provides power savings of 50%. The ESM is very compact thanks to the use of state-of-the-art microelectronic and power electronic components. Overexcitation time and holding voltage can be factory-programmed to customer demands.

Thanks to extremely compact design the overexcitation rectifier "Slim Collection" can be installed in very restricted space. The module features a central bore for screw fixing inside the terminal box. It can also be installed by using an adhesive pad.

Twopole and singlepole auxiliary voltage transformers designed to supply control cubicle with low voltage power.

Common type wires and terminals to provide a reliable connection between auxiliary voltage transformer and recloser control cubicle.

Hotdip galvanized steel mounting kit for Rec15/25 frontal and lateral pole installation. Mounting kit is applicable for all types of wooden, concrete or metal single poles and Hpole structures. Kit could include accessories for control cubicle pole mounting and up to two voltage transformers installation.

Custom designed bird guards to provide a protection against wildlife and aggressive environment.

Air insulated switching module incorporates a Tavrida Electric vacuum circuit breaker with a per phase actuator, housed in a corrosion resistant tank. Six main circuit bushings, made from UVstable polymer, are covered with silicone rubber bushing boots. Each bushing has builtin current and voltage sensors for protection, measurement and indication purposes. The outdoor switching module is equipped with six, high voltage bushings with embedded current and voltage sensors. Current sensing is performed by Rogowski coil sensors. Capacitive sensors are used for voltage measurement in all six bushings. Tavrida Electric manufactures small vacuum interrupters with extremely long mechanical and electrical lifespans. A specially designed axial magnetic field distribution provides even current density over the contact surface and significantly improves the vacuum's interrupting performance.

Challenge To execute a pilot project at the Energisa distribution network operator in Brazil within a tight time frame. The customer needed to install 23 kV outdoor circuit breakers with protection at a newly erected substation. Solution Tavrida Electric supplied the Rec25 with substation mounting kit to meet the deadline and satisfy the customer’s requirements in terms of protection. The mounting kit was subjected to comprehensive mechanical tests including overweighting, wind load and seismic impact with successful results.

Tavrida Electric recloser can be used to quickly build costeffective unmanned structure mounted outdoor substation. Provides full protection and automation functionality required at the substation.

Thousands of nodding donkey oil pumps were energized through an extensive and highly meshed overhead electrical network. Automated protection was performed only by the feeder CB at the substation. None of the line sectioning breakers were automated, so every single failure on the network required human intervention and led to significant outages. Solution Tavrida Electric installed and commissioned six Rec15 with Rezip* functionality on a single line in just one day. The following project outcomes were achieved Direct savings (outage time reduction → revenue loss reduction) Indirect savings (operation, maintenance, and repair cost reduction) Improvement of power supply quality and reliability Drastically improved network visibility and operator awareness *Rezip is an advanced Fault Detection, Isolation and Restoration (FDIR) algorithm

Radial line recloser When a recloser is installed on a radial feeder it automatically clears transient faults and isolates permanent faults. More than one recloser can be installed on a feeder to isolate faults selectively and ensure fewer customers are affected. Loop recloser A loop recloser further improves the reliability of a power supply by automatically reconfiguring a network in the event of a failure.

Sophisticated control and protection Tavrida Electric reclosers provide protection from various faults, including short circuits, earth faults, high impedance earth faults, broken wires, islanding, incorrect tap changer operations, network overload and over or undergeneration. Embedded RTU and metering ensures the reclosers are SCADAready with no additional expenses. TELARM® Dispatcher and DualSCADA TELARM® Dispatcher is proprietary remote control and monitoring system that works as a standalone SCADA and/or in parallel with an existing SCADA system, acting as a backup method of controlling and monitoring reclosers. TELARM® Dispatcher offers a number of features not available with most conventional SCADA systems, such as remote access to system logs, fault and load profiles and the remote control of protection settings. With maintenancefree design rated to perform 30,000 open and close operations, Tavrida Electric reclosers keep expenses to a minimum over their entire lifespan.

Continuous selfsupervision. Vacuum circuit breakers equipped with the CM16 control module continuously monitors control, switching modules, functional wiring and auxiliary power supply quality. CM16 eliminates the necessity of additional trip and close coils, charging mechanisms and all related wiring supervision. The whole trip and close circuit supervision comes in single package with any Tavrida Electric VCB. CM16 allows the user to forget about scheduled trip and close wiring inspections as in the event of malfunction corresponding notification will be sent to the operator using one of the inbuilt output relays and indicated by inbuilt in CM LEDs. Low power consumption. Vacuum circuit breakers equipped with the CM16 control module need less than 42 W in charging mode – just 10% of what the best alternatives available on the market need!

Tavrida Electric manufactures small, compact vacuum interrupters with an extraordinarily long mechanical and electrical lifespan. A specially designed axial magnetic field distribution provides an even current density over the contact surface, substantially improving the vacuum interrupting performance. Vacuum interrupter contacts have unique design, based on the mixture of copper and chromium metals and various dopants, to ensure long electrical life of contacts, low contacts resistance and chopping current. The patented, supercompact actuator design allows the circuit breaker to be installed directly underneath each pole. The design is optimal in terms of reliability, dimensions, weight and ease of installation. A spring charged by the magnetic actuator during the closing of the circuit breaker ensures main contacts pressure is maintained. The spring is integrated in the actuator and does not require any maintenance during the circuit breaker's lifetime.