Hilkar
Hilkar, combines extensive research and development with high quality systems in both manufacturing and design processes. In addition to this, an extensive sales organization and experienced customer response have founded. Today, dedicated to serving our customers in Turkey and abroad, Hilkar is one of the main power resistors, reactors, special transformers and motor control and testing systems supplier in the world.
- +90 264 275 5540
- +90 264 275 1276
- hilkar@hilkar.com
- Organize Sanayi Bolgesi 10.Cad. No:9
Arifiye/Sakarya, 54580
Turkiye
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Combined Load Banks
C-Series
C-series combined load banks are devices which contain resistive and reactive loads, apply the load to an electrical power source and dissipate the power of the electrical power.
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Neutral Grounding Resistors
NGR
Neutral Grounding Resistors (NGRs) are used to limit the fault current for safety of equipment and personnel in industrial systems.
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Resistive Load Banks
R Series
Load banks are devices which contain resistive, inductive and/or capacitive loads, apply the load to an electrical power source and dissipate the power of the electrical source. Portable and stationary resistive load banks incorporate as low as 1 kW load step increments for testing small to large generating sets. The fine control resolution ensures accurate load control and power factor targeting adjustments.
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Motor Starting & Control Resistors
Motor Starting Resistors are used to reduce the voltage at the motor terminals and also decrease the starting current. Motor Starting Resistors are necessary because the self resistance of a motor armature is very low. When the voltage is first applied, excessive current will flow. For limiting this current, since there will be no resisting back electromotive force (emf),some series resistance can be added to the armature windings.
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Reduced Voltage Motor Starting Panels by Reactors
A method to limit motor starting current is a series reactor. Iron core or air core reactors can be used for starting purposes. If an air core is used for the series reactor then a very efficient and reliable soft starter can be designed which is more suitable for high MW ratings of synchronous/induction motors at MV levels. The reactors are designed with taps.
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Motor Termination Units
Since the rise time of IGBTs are in the range of a few tens of nanoseconds (between 50ns-200ns), even short cables between PWM motor drives and motors cause voltage doubling at the motor terminals due to Travelling Wave Phenomenon as in transmission lines. The insulation of motor windings are prone to failure due to high voltage spikes if necessary precautions are not sufficiently taken. RC Type Output Filter Modules reduce these high voltage spikes to protect motors by connecting to stator terminals.
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LV Iron Core Smoothing Reactors
Smoothing Reactors are serially connected reactors inserted in DC systems to reduce harmonic currents and transient over currents and/or current ripples in DC systems. They are necessary in order to smooth the direct current wave shape to reduce losses and improve system performance.
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Slip-Ring Motor Starting Panels
Rotor Starter
The Slip-Ring Motor Starters are based on the series of resistors that are applied to the rotor circuit to control the speed/torque characteristics of the motor. Rotor starters are mainly used for the motor starting applications requiring high-starting torque like loaded belt conveyors in mining industry. By external resistors, it is possible to shift the motor maximum (break-down) torque up to starting torque point for motors under heavy loads during start-up. The resistors are splitted into some steps and controlled via contactors by motor starting control system. As the motor speed increases, the external rotor resistors are eliminated by shorting contactors until all external resistors are shorted out.
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Dynamic Braking Resistors
Speed of three phase asynchronous squirrel-cage motors and three phase synchronous motors are generally controlled by motor drives where frequency of the drive output determines the motor speed, and it can be adjusted without dependence on the voltage magnitude.
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Air Core Smoothing Reactors
Smoothing Reactors are serially connected reactors inserted in DC systems to reduce harmonic currents and transient over currents and/or current ripples in DC systems.
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Primary Current Injection Testers
Primary Current Injection Tester is designed for testing protective relay and circuit breakers and also testing the turns ratio of current transformers at high variable currents. A test current is injected into the primary side of a system to determine how the system behaves at particular levels of current. This test makes it possible to determine whether the relay will trip and how long the current needs to flow before the trip is initiated.
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LV Iron Core Line & Load Reactors
Line and load reactors are generally serial-connected to the input and/or output terminals of three phase equipment such as motor speed controllers, inverters and UPS systems. These equipment make use of semiconductor switches such as IGBTs, thyristors, and diodes and therefore create harmonic distortion and high switching over-voltages (dv/dt). Use of such equipment has been becoming more widespread as the technology advances. However, the negative effects of these equipment should not be overlooked.
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Inductive Load Banks
L-Series
L-series inductive load banks are devices which contain inductive loads, apply the load to an electrical power source and dissipate the reactive power of the electrical source. L-series load banks are designed for portable and fixed applications. Hilkar brand L-series load banks have robust design and are specifically designed for corrosive environments. Load banks can be controlled via local, remote, wireless remote or automatic control systems.
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LV Iron Core Shunt Reactors
Iron core Shunt Reactors act as an absorber of reactive power to increase energy efficiency of the power system. Shunt Reactors are used in order to compensate capacitive reactive power generated by long and lightly loaded transmission lines as well as underground cables, thus allowing the flow of more active power through the system and avoiding over voltages. Shunt Reactors can be directly connected to the power line or to a tertiary winding of a three-winding power or distribution transformer.
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Grounding Transformers [ZN (Zigzag), ZNyn, YNd(open), Ii0]
Grounding Transformers are designed for providing an artificial neutral point for ungrounded three phase power systems. During the line-to-ground faults, grounding transformers provide an easy path to ground faults to limit the fault currents and transient overvoltages.
