Keneng FACTS Systems & Anode Reactors

Manufacturing Credentials of Zhejiang Jiashan Keneng

Zhejiang Jiashan Keneng Power Equipment Co., Ltd. is an elite industrial manufacturing center within Sun.King Technology Group, engineering critical power apparatus for Flexible AC Transmission Systems (FACTS) and Ultra-High Voltage Direct Current (UHVDC) transmission links.

Located in Jiashan (Zhejiang), the facility is equipped with dedicated automated machinery for toroidal winding, high-temperature magnetic annealing of amorphous and nanocrystalline ribbons, and vacuum pressure impregnation (VPI) autoclaves.

Keneng's quality testing center operates impulse voltage test generators up to 1200 kV, automated full-power synthetic thyristor switching test rigs, and high-vacuum thermal chambers.

All Keneng apparatus conform rigorously to State Grid Corporation of China technical benchmarks and IEEE/IEC international standards.

Physics and Protective Mechanism of ETT Saturable Anode Reactors

High-power HVDC thyristors utilize monocrystalline silicon wafers measuring 100 to 150 mm in diameter.

When gate firing signals arrive, conduction initiates within a localized microscopic zone surrounding the gate contact, spreading across the full wafer area at speeds around 0.1 mm/µs—taking up to 30 microseconds for complete active area plasma spread.

If the forward current surges too rapidly during this initial turn-on window (di/dt > 1000 A/µs), excessive current density concentrates at the inception hotspot, causing instant thermal punch-through. Keneng ETT saturable anode reactors exploit non-linear magnetic hysteresis.

In the first microseconds, the un-saturated core exhibits immense inductance that restrains di/dt. Once full conduction spreads, the core saturates deeply, its inductance plummets by orders of magnitude, and conduction losses vanish.

Engineering the High-Power Water-Cooled ETT-6250 Series

In flagship ±800 kV and ±1100 kV UHVDC inter-regional power superhighways, continuous valve operating currents reach 5000 to 6250 A. At this intensity, even micro-ohmic winding resistance generates massive thermal dissipation.

ETT-6250 series reactors employ toroidal cores fabricated from ultra-thin, low-loss silicon steel ribbons exhibiting high saturation flux density (Bs > 1.8 T), cooled continuously with demineralized water.

The primary conductor is formed from seamless, hollow oxygen-free copper tubing through which high-resistivity coolant circulates.

Outer structural encapsulation utilizes vacuum-molded glass-reinforced epoxy resin, providing hermetic integrity, zero partial discharge, and immense mechanical shock endurance during external short-circuit fault stresses.

Application of LTT-2 Light-Triggered Thyristor Reactors

Directly Light-Triggered Thyristors (LTT) fire via infrared optical laser pulses sent via quartz fiber directly into a photodiode window etched into the silicon wafer. This dispenses with bulky high-potential electronic gate boards.

However, optical trigger pulses possess lower energy density than electrical gate pulses, prolonging the initial conduction spreading interval.

Keneng LTT-2 series reactors are tailored to optical thyristor turn-on dynamics: core volt-second retention area is expanded, ensuring full current hold-off protection even if optical laser emitter output degrades marginally over long operating cycles.

Architecture and Network Value of SVC Systems

Static Var Compensators (SVC) dynamically stabilize transmission grid voltages and balance reactive power across 10–220 kV substations. The primary topology combines a three-phase delta-connected Thyristor-Controlled Reactor (TCR) with parallel harmonic filter banks (Fixed/Filter Capacitors, FC).

By continuously varying thyristor firing angles from 90° to 180°, high-speed digital controllers modulate inductive reactive current seamlessly.

This cancels excess capacitive charging currents on unloaded long transmission lines at night, while instantaneously injecting reactive VARs into the grid during daytime industrial load surges.

Next-Generation Fast IGBT STATCOM (SVG) Technology

Static Var Generators (SVG), known internationally as STATCOM, represent modern grid stabilization power electronics. Instead of massive passive reactors and capacitor banks, Keneng SVG deploys high-speed IGBT semiconductor stacks arranged in modular multilevel cascade (MMC) topologies.

The inverter synthesizes a balanced three-phase AC sinusoidal voltage of controlled amplitude and phase angle. If the output voltage exceeds grid voltage, the STATCOM generates capacitive VARs; if lower, it absorbs inductive VARs.

Transitioning between full leading and full lagging power takes less than 5 milliseconds, effectively damping subsynchronous power grid oscillations.

Passive Filter Compensating Arrays (MSC and FC)

Heavy industrial sites operating electric arc furnaces, rolling mills, and mining hoists cause severe harmonic distortion (5th, 7th, 11th orders) accompanied by low power factor. Keneng MSC and FC systems combine high-voltage capacitor banks with air-core filtering reactors.

The reactor and capacitor are tuned to series resonance at specified harmonic frequencies, creating a near-zero impedance path that diverts harmonic currents harmlessly to ground.

Simultaneously, at fundamental 50 Hz, the array acts as a clean reactive power source, boosting plant power factor to 0.98–0.99.

High-Power DC De-Icing Systems for Overhead Lines

Severe winter freezing rain builds heavy ice sleeves on transmission line phase conductors and overhead ground wires, triggering line galloping, phase flashovers, and catastrophic tower collapse. Keneng DC De-Icing systems are high-power mobile or stationary thyristor rectifier installations.

Operating by applying continuous high-amperage direct currents (3000–6000 A) across an isolated transmission segment, the line heats uniformly via Joule dissipation.

This melts and sheds the ice sleeve along multi-kilometer spans within 20 to 40 minutes without damaging conductor tensile annealing properties.

Installation, Commissioning, and Maintenance Protocols

Field assembly of ETT saturable reactors and FACTS installations complies with rigorous manufacturer protocols. During valve hall installation, verify busbar bolt torque with calibrated tools and test all deionized water cooling quick-disconnect couplers for zero leakage.

Pre-commissioning steps include measuring DC winding resistance using Kelvin micro-ohmmeters, verifying magnetic saturation curves, and executing high-voltage insulation tests.

For SVC and SVG systems, calibrate optical current and voltage transformers and run closed-loop simulation sequences prior to grid synchronization.

Technical Submission and Inquiry Coordination

To request an engineered Keneng SVC or SVG reactive power proposal, provide substation single-line diagrams, daily active/reactive power load profiles (P, Q), grid nominal voltage, and target power factor and harmonic distortion (THD) limits.

For saturable anode reactors (ETT/LTT series), specify exact existing part numbers, thyristor silicon types, continuous valve currents, and cooling mode (demineralized water or forced air). Direct technical submissions to zakaz@spare24.ru for an expedited engineering review.