Trench Group / HSP high voltage bushings and instrument transformers

Technical selection and global delivery of RIP, RIS, RIG transformer bushings, Clean Air instrument transformers and dry-type air core reactors from Trench Group and HSP.

Trench and HSP high voltage transformer bushings (RIP, RIS)

Trench and HSP transformer bushings utilizing dry RIP (resin impregnated paper) and RIS (resin impregnated synthetics) insulation systems operate reliably across voltage classes from 24 to 1200 kV. Explosion-proof designs withstand severe seismic loads while eliminating transformer fluid leakage.

Dry condenser grading core delivering partial discharge performance below two picocoulombs
Seamless silicone rubber composite insulator providing persistent surface hydrophobicity
Direct one-to-one dimensional interchangeability for field replacement of aged bushings
Integrated test taps facilitating uninterrupted online monitoring of capacitance and loss factor

Trench and HSP generator and heavy-current bushings (RIG, OIP)

High-current generator bushings with RIG (resin impregnated glass) insulation and field-proven OIP oil-impregnated paper bushings handle nominal currents up to fifty kiloamperes. The assemblies endure severe thermal transients and electrodynamic short-circuit forces across power stations.

Resin impregnated glass RIG technology tailored for generators up to one and half gigawatts
Heavy-duty copper conductor tubes engineered for forced air or direct deionized water cooling
Graded oil-impregnated paper OIP condenser cores for ultra-high voltage power transformers
Non-magnetic aluminum mounting flanges equipped with dual elastomer sealing barriers

Trench Clean Air eco-friendly instrument transformers

The Trench Clean Air instrument transformer family utilizes synthetic purified dry air instead of sulfur hexafluoride, reducing greenhouse gas emissions across substations to zero. The units guarantee 0.2S accuracy class for revenue metering and protective relaying up to 420 kV.

Complete elimination of fluorinated greenhouse gases with zero global warming potential
Stable metrological measurement accuracy maintained across temperatures down to minus fifty
Capacitive and inductive voltage divider architectures for indoor GIS and outdoor yards
Low-impedance secondary metering cores matching modern digital micro-relay protection inputs

Trench conventional fluid and gas instrument transformers (Gas & Fluid)

Oil-insulated and gas-insulated Trench instrument transformers including IOSK, SAS, SVS and TEM platforms operate on transmission grids up to 1100 kV. The top-core head geometry featuring stainless steel expansion bellows prevents oxygen ingress into the dielectric medium.

Stainless steel thermal fluid expansion bellows assembly featuring clear level indication
Withstand capability for short-circuit currents up to sixty-three kiloamperes for three seconds
Combined current and voltage transformer configurations saving footprint within switchyards
Rupture diaphragm mechanism providing directional pressure relief during internal fault arcs

Trench air core dry-type shunt and series reactors (Air Core Reactors)

Air core dry-type reactors produced by Trench Austria and Trench Canada operate without ferromagnetic cores or cooling fluid, eliminating magnetic core saturation and fire hazard. The coils limit short-circuit currents, balance reactive power and filter harmonics across FACTS networks.

Linear inductance sustained during severe fault currents due to absent magnetic core elements
Multi-layer glass-reinforced encapsulation cured with epoxy shielding against ultraviolet light
High-creepage composite post insulators rated for seismic conditions and high pollution levels
Integrated Line Traps for power line carrier communications and remote telemetry teleprotection

Trench arc suppression coils and earth fault neutralization systems

Trench plunger-core arc suppression coils (Petersen coils) provide stepless tuning of air gaps to neutralize single-phase ground fault capacitive currents across 6 to 110 kV networks. Integrated with automated controllers and ARCC systems, they quench ground arcs and prevent fire ignition.

Motor-driven plunger core assembly enabling continuous automatic resonance tuning to grid values
Eco Fluid formulation using biodegradable synthetic esters with elevated fire flash point values
Microprocessor neutral management controllers resolving faulted grid feeder phases in real time
ARCC wildfire mitigation architecture eliminating sparks and line fire ignition during faults

Installation and vacuum oil impregnation procedure for Trench and HSP bushings

Proper installation of Trench and HSP high voltage transformer bushings with dry RIP or RIS condenser insulation requires extreme cleanliness across mating surfaces and precise flange torque control.

Before lowering the bushing assembly into the power transformer mounting turret, service engineers perform thorough visual inspections of the silicone composite insulator housing to confirm absence of mechanical micro-fissures.

Fluoroelastomer sealing gaskets seated within machined flange grooves are lightly coated with dry transformer fluid. Mounting studs undergo diagonal cross-pattern tightening using calibrated torque wrenches according to factory guidelines.

The completed assembly rests immersed for twenty-four hours before high voltage energization.

Insulating gas density monitoring protocols for Trench Clean Air transformers

Safe operation of Trench Clean Air current and voltage instrument transformers relies on continuous density verification of purified dry synthetic air within the hermetic housing. Insulating gas density is monitored through integrated temperature-compensated digital transmitters.

If internal pressure drops below the primary warning threshold, an alert transmits to the substation automation network without initiating immediate feeder tripping. Secondary metering and protection windings undergo continuity verification to eliminate open-circuit hazards during load conditions.

External copper grounding bus connections are cleaned of surface oxide films down to a polished finish.

Encapsulation maintenance and insulator inspection for Trench Air Core Reactors

Periodic maintenance for Trench Air Core Reactors encompasses thorough inspection of composite post insulator columns and copper terminal busbars.

The absence of a ferromagnetic steel core eliminates magnetic core overheating risks, yet severe electrodynamic forces require periodic verification of high-torque bolted joints.

The external protective epoxy-glass encapsulation is cleared of conductive industrial dust, salt deposits and atmospheric grime using filtered compressed air jets. Winding insulation resistance to ground is verified using a calibrated high-voltage megohmmeter.

Minor resin surface blemishes are restored on-site using approved polymer repair compounds.

Motor drive calibration and tuning procedures for Trench arc suppression coils

Reliable service life of Trench plunger-type arc suppression coils and ground fault neutralization platforms demands routine testing of the integrated motor drive.

A precision stepper actuator displaces the movable magnetic plunger to continuously adjust coil inductance into resonance with changing grid zero-sequence capacitance.

Scheduled servicing confirms smooth worm gear motion, absence of mechanical backlash and accurate alignment of inductive limit switches. Neutral grounding connection joints are stripped of surface oxidation and re-torqued using zinc-plated hardware.

Dielectric dissipation factor diagnostic testing for Trench generator bushings

Dielectric insulation monitoring across Trench RIG and OIP high-current generator bushings relies on uninterrupted online parameter tracking during energized service. High-voltage test taps connect to digital diagnostic sensors recording core capacitance and dielectric dissipation factor.

An increase in loss factor exceeding fifty percent of original baseline records signals moisture ingress or localized resin degradation.

For conventional OIP oil-impregnated paper bushings, insulating fluid samples are drawn through hermetic sampling ports for dissolved gas chromatography to detect early partial discharge activity.

Stainless steel volume expansion bellows inspection for IOSK and SAS transformers

Preventative maintenance for Trench inverted head instrument transformers including IOSK and SAS series focuses on stainless steel volume expansion bellows integrity.

The top-mounted stainless steel bellows accommodates thermal fluid volume expansion while isolating internal dielectric fluid from ambient atmospheric moisture. Bellows position indicators are compared against ambient temperature scales during field inspections.

Optical inspection glass ports are examined for fluid discoloration or micro-bubble evolution. All terminal box entry glands and flange fasteners are re-torqued to prevent moisture ingress.

Trench Group / HSP and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Trench Group / HSP and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.