High Voltage Switchgear & Transformer Installation
Expert high voltage switchgear and transformer installation for commercial, industrial, and utility-grade electrical infrastructure across the region. As a trusted partner to local professionals and facility operators, we offer comprehensive electrical services designed to ensure reliable performance and support the future of your power distribution network.
5 Highlights on High Voltage Switchgear & Transformer Installation
- Qualified high voltage engineers commission and install vacuum circuit breakers, SF6 circuit breakers, and air circuit breakers rated from 11kV through 132kV, working to manufacturer specifications and site-specific single-line diagrams – delivering precision high-voltage installation on every project.
- Transformer installation covers dry-type, oil-filled, and gas-insulated units – including OLTC tap changer commissioning, dissolved gas analysis, condition assessment, and winding resistance testing before energization. Our maintenance services include transformer inspections to identify potential issues and restore reliable operation.
- Full protection relay setup includes overcurrent relay, differential relay, earth fault relay, and distance relay configuration, with secondary injection testing and relay coordination grading verified by a qualified protection engineer.
- Cable termination and jointing uses XLPE cable, armoured cable, heat shrink and cold shrink termination kits, crimped lugs, and torqued terminal connections to rated specifications. We also perform cable splicing and underground cable work, including underground duct installations, with careful planning to minimize outages.
- Permit to work, lockout/tagout, and earthing procedures are applied on every job – earthing clamps, discharge rods, and insulating gloves are standard issue for all live adjacent work, ensuring safe conditions throughout.
Why Choose Our High Voltage Switchgear & Transformer Installation
Kochs Electric fields authorised persons, competent persons, and commissioning engineers with hands-on experience across MV panels, LV panels, marshalling kiosks, and substation switchrooms. As local professionals and a trusted partner to Indiana facilities, we provide tailored comprehensive services designed to meet the specific needs of each site. Every technician carries current high voltage certification and works under a documented method statement and risk assessment before any switchgear or transformer is touched.
We install, commission, and provide comprehensive high-voltage testing to IEC and AS/NZS standards. Our commissioning engineers run primary injection testing, high-pot testing, megger insulation resistance testing, and tan delta testing on every transformer and switchgear assembly before sign-off – ensuring consistent performance and long-term reliability. We don’t hand over a system until the test report and commissioning record are complete and verified.
Our switchgear technicians and transformer technicians are trained on withdrawable, fixed, and plug-in circuit breaker designs. We handle rack-in and rack-out procedures, interlock checks, and auxiliary switch verification as part of every installation – designed to support consistent, reliable operation and reduce the risk of equipment failures.
Kochs Electric coordinates directly with protection engineers and site supervisors to align protection settings, relay coordination, and SCADA RTU integration. We work across indoor and outdoor substations, transformer bays, cable basements, and switchrooms. Our team brings calibrated test equipment – winding resistance testers, turns ratio testers, frequency response analysers, and partial discharge testers – to every site, providing access to precision troubleshooting tools and design expertise to meet project requirements and support energy efficiency upgrades.
Signs You Need High Voltage Switchgear & Transformer Installation
1. You’re commissioning a new substation or switchroom: New construction projects require a full installation sequence – transformer mounting and alignment, busbar chamber assembly, circuit breaker racking, cable box termination, and protection installation wiring. Careful planning is essential to ensure each stage meets specification and prevents future failures. A qualified commissioning engineer needs to witness and verify each stage before the system is energized.
2. Your existing switchgear is aged, faulted, or no longer rated: Vacuum circuit breakers and SF6 circuit breakers have defined service lives. A condition assessment can identify signs of arcing, corona discharge, partial discharge, or insulation breakdown on megger testing – at which point replacement or retrofit is the correct path. Continuing to operate faulted or tripped switchgear without inspections puts the entire distribution system at risk of serious damage.
3. Your transformer is showing abnormal dissolved gas analysis results: Elevated hydrogen, acetylene, or carbon monoxide in insulating oil points to internal faults – winding breakdown, core hotspots, or Buchholz relay activation. A transformer technician needs to sample, analyse, and assess the condition of the unit before it’s re-energized, taking the steps needed to restore reliable operation. Oil-filled transformers also need moisture content checks and dielectric strength testing after any maintenance services.
4. You’re upgrading from manual to motorized or automatic switchgear: Replacing manual operating mechanisms with motor drives, solenoids, or stored energy mechanisms requires careful control wiring, auxiliary switch reconfiguration, and anti-pumping relay checks. These upgrades are designed to improve operational efficiency and support broader energy efficiency goals across your distribution network. Auto-reclose and recloser settings need to be coordinated with the upstream protection scheme.
5. You’re extending or reconfiguring your MV or LV distribution network: Adding new MV panels, distribution boards, or metering panels to an existing busbar system requires phasing checks, phase rotation verification, and load balancing before the new section is switched in – with careful planning to avoid unplanned outages during the transition. A protection engineer needs to review and update relay settings and grading to cover the expanded network, ensuring consistent, reliable operation going forward.
Our High Voltage Switchgear & Transformer Installation Process
Step 1 — Site Assessment and Documentation Review Our engineers review the single-line diagram, wiring diagram, cable schedule, and protection settings before mobilizing – with careful planning to ensure the electrical design meets all project requirements and supports future performance. We confirm equipment ratings, vector group, voltage ratio, and cooling class against the project specification.
Step 2 — Permit to Work and Isolation The authorised person issues a permit to work, applies lockout/tagout devices, and confirms the system is de-energized and earthed – ensuring safe access for all personnel. Earthing clamps and discharge rods are applied to all conductors before work begins.
Step 3 — Mechanical Installation Switchgear panels, transformer units, and associated equipment are mounted, leveled, aligned, and braced to manufacturer tolerances. Cable trays, cable ladders, conduit, trunking, and underground duct are installed and secured – designed to provide reliable support for the full cable and wiring system.
Step 4 — Cable Termination and Wiring XLPE and armoured cables are terminated using heat shrink or cold shrink kits, crimped lugs, and torqued terminal connections. We include cable splicing where required. Control wiring, pilot cables, and screened pairs are connected to terminal blocks and marshalling kiosks.
Step 5 — Testing and Commissioning Comprehensive high-voltage testing – including insulation resistance testing, winding resistance testing, turns ratio testing, and high-pot testing – is completed. Visual inspections are carried out to identify any condition issues before energization. Protection relays are set and tested using secondary injection kits. The commissioning engineer witnesses all tests and signs off the commissioning record to meet project handover requirements.
Step 6 — Energization and Handover The system is energized under controlled conditions with the site supervisor and authorised person present. Load current, voltage ratio, and phase rotation are confirmed to ensure reliable operation from the start. All test reports, inspection checklists, and commissioning records are handed over – providing a comprehensive package to support ongoing maintenance services and future upgrades.
Brands We Use
Kochs Electric installs and commissions equipment from the industry’s most trusted manufacturers. Our switchgear technicians and transformer technicians are trained on:
- ABB
- Schneider Electric
- Siemens
- Eaton
- GE Grid Solutions
- Mitsubishi Electric
- Legrand
- Omicron
- Megger
- Fluke
All equipment is installed to manufacturer specifications and tested with calibrated instruments.
Other Services
| High voltage switchgear installation | MV switchgear installation | Vacuum circuit breaker commissioning |
| Transformer installation services | Power transformer installation | Oil-filled transformer commissioning |
| High voltage electrical installation | HV electrical installation | Substation installation and commissioning |
| Switchgear commissioning | MV panel commissioning | Protection relay testing and setting |
| Transformer commissioning | Distribution transformer installation | Winding resistance and turns ratio testing |
FAQs About High Voltage Switchgear & Transformer Installation
What is high voltage switchgear installation?
High voltage switchgear installation covers the mechanical and electrical installation of circuit breakers, disconnectors, isolators, busbars, cable boxes, and protection relays in MV and HV switchrooms and substations. It includes all associated cable termination, control wiring, and commissioning testing before the system is energized. Our services also provide access to precision troubleshooting and condition assessment throughout the installation process.
When does a transformer need to be replaced rather than repaired?
A transformer technician will assess dissolved gas analysis results, insulation resistance, winding resistance, and tan delta test data. If the insulation class is compromised, the winding temperature rise exceeds rated limits, or the Buchholz relay has operated due to an internal fault, replacement is typically the correct decision over repair.
Why does switchgear need commissioning testing before energization?
Commissioning testing confirms that circuit breakers operate correctly, protection relays trip at the right settings, interlock sequences function, and insulation resistance meets rated values. Skipping these tests risks energizing equipment with wiring faults, incorrect relay settings, or mechanical defects that can cause a fault current event or equipment failure – ensuring thorough testing is the only reliable way to confirm safe operation and prevent failures from the outset.
How does Kochs Electric handle high voltage safety on site?
Every job starts with a permit to work issued by an authorised person. The system is isolated, locked out, tagged out, and earthed before any work begins. Earthing clamps, discharge rods, insulating gloves, arc flash suits, and rubber mats are used throughout. A risk assessment and method statement are completed before mobilization.
Can Kochs Electric commission protection relays and SCADA systems?
Yes. Our protection engineers configure overcurrent relays, differential relays, earth fault relays, and distance relays to the project protection settings. We test using secondary injection kits and coordinate with SCADA RTU and IEC 61850 systems where required.
Does Kochs Electric work on both indoor and outdoor substations?
Yes. As local professionals serving Indiana and the surrounding region, we offer comprehensive installation and commissioning services for indoor switchrooms, outdoor transformer bays, pad-mounted transformers, pole-mounted equipment, and cable basement terminations across a full range of MV and HV voltage levels.