Advanced Protection & Monitoring Fittings by KROS Electric Co., Ltd.
At KROS Electric Co., Ltd., we understand that industrial energy networks and utility grids demand specialized, high-reliability protection mechanisms. Beyond our BIS-certified standard transformer builds, we supply custom-engineered optional fittings to elevate operational safety, prevent costly downtime, and enable digital control integration.
Backed by over 35 years of engineering authority, every optional fitting undergoes strict quality control and multi-stage testing in accordance with IEC, IEEE, and BIS standards to withstand extreme operational conditions worldwide.
Remote Tap Changer Control (RTCC) Cubicle
Enables safe remote voltage regulation and seamless integration with SCADA systems from central control rooms.
Buchholz Relay with Alarm & Trip Contacts
Provides dual-stage gas-actuated early warning for dielectric gas accumulation and internal short-circuit faults.
Oil & Winding Temperature Indicators (OTI / WTI)
Dual-dial micro-switch indicators for real-time thermal monitoring, cooling fan automation, and overload protection.
Comprehensive Range of Protection Accessories
Explore the complete suite of modular protection equipment available for custom integration into power, distribution, solar, and dry-type transformers:
Pressure Relief Valves (PRV)
Self-resealing safety valves designed to vent sudden internal pressure surges instantly, protecting tank structural integrity.
Marshalling Boxes
IP65-rated weatherproof control enclosures housing OTI, WTI, terminal blocks, and relay interfaces for centralized monitoring.
Magnetic Oil Level Gauges (MOLG)
Features magnetic dial displays coupled with dual-contact alarm switches to prevent dry running due to oil loss.
HT & LT Cable Enclosures
Custom weatherproof termination boxes constructed from heavy-gauge sheet steel for extreme environment reliability.
Automatic Voltage Controllers (AVR)
Solid-state electronic control modules ensuring continuous output voltage stability during fluctuating grid loads.
Forced Air Cooling Control Fans
Automated thermal management systems designed to boost transformer rating during peak overload conditions.
Technical Specifications & Compliance Standards
| Optional Accessory | Protection Function | Interface / Output | International Standard |
|---|---|---|---|
| Buchholz Relay | Gas accumulation & internal arc protection | NO/NC Alarm & Trip contacts | IEC 60076-10 / IS 3639 |
| RTCC Panel + AVR | Remote tap control & voltage regulation | 4-20mA / RS485 Modbus / SCADA | IEC 60214 / IEEE C57.12 |
| WTI & OTI Indicators | Thermal monitoring & cooling control | Dual micro-switches + Analog dial | IS 8468 / IEC 60076 |
| Pressure Relief Valve | Overpressure protection & surge venting | Limit switch trip contact | ISO 9001 / IEC 60076 |
| Marshalling Box | Instrument centralization & marshalling | IP55 / IP65 Weatherproof Enclosure | IEC 60529 |
Require Custom Transformer Accessories for International Projects?
Consult with the engineering specialists at KROS Electric Co., Ltd. to design custom-fitted protection, monitoring, and tap-changing configurations tailored to your local grid standards.
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