Rotor Earth Fault Protection Supply Case: What Pacific Engineering Shipped

A rotor earth fault protection supply case is a complete replacement supply for ANSI function 64R rotor earth fault protection on a synchronous generator. This one went to a Pakistani industrial client as a SEG Woodward XR-1 equivalent.

At a glance

• Application: a rotor earth fault protection supply case for ANSI function 64R on the rotor winding of a synchronous generator, built to IEC 60255-1:2022.
• Fault covered: single-point insulation damage on the rotor winding. Alarm at 20-140 kΩ, trip at 0-30 kΩ, both adjustable.
• Device replaced: SEG / Woodward XR-1, injection type.
• Device supplied: AS-6085, a 64R voltage injection relay with the same cabinet footprint as the unit it replaces.
• Action delay: 0-50 s. One setting covers both the short and the long range.
• Protection logic: two stages, with alarm and trip thresholds set independently.
• Delivery: export packing, cross-border land transport into Pakistan, customs documents prepared by Pacific Engineering.
• Close-out: remote commissioning, simulation fault tests, then the on-site acceptance record.

For this 64R supply case Pakistan, the comparison started with the SEG Woodward XR-1 equivalent already fitted on the machine. The reference values came from the XR-1 manual, not from a datasheet summary.

Every 64R retrofit case runs the same sequence: collect the reference values from the device in service, compare them line by line, confirm the wiring, quote, build, ship, then commission remotely. Published 17 August 2026. Last updated 24 September 2026.

Who Supplied It: Pacific Engineering

Headquartered in Karachi, Pakistan, Pacific Engineering is a professional supplier focusing on electrical equipment distribution, industrial automation solutions, and medium & low-voltage power protection systems. We serve industrial power plants, EPC contractors, and manufacturing clients across Pakistan and Afghanistan.

Our core business covers power system protection relays, generator auxiliary equipment, industrial automation control components, and certified electrical spare parts. We adhere to strict international technical standards and supply specifications, providing one-stop services including technical matching, product supply, logistics delivery, on-site guidance and after-sales technical support for overseas power engineering projects.

What the Client Asked For

The Operating Condition Behind the Request

The Pakistan local industrial client needed a professional synchronous generator rotor earth fault protection device to solve the hidden danger of rotor winding insulation damage and earth faults in power generation units. The client clearly required the product to achieve full functional equivalence with SEG/Woodward XR-1 rotor earth fault relay, meeting the operating parameters and protection logic of local power generation equipment.

The Technical Limits That Drove the Specification

Combined with the client’s on-site generator operating conditions and XR-1 standard parameters, the project confirmed the following mandatory technical requirements, fully compliant with IEC 60255-1:2022 (measuring relays and protection equipment):

• Dual-stage protection logic: independent setting of rotor earth fault alarm and tripping thresholds
• Adapt to high and low impedance earth faults of generator rotor windings
• Support adjustable protection action delay to avoid false tripping
• Wide-range auxiliary power supply, adaptable to on-site AC/DC power conditions
• With fault data recording, parameter reset and password protection functions
• Equipped with standard communication interface and relay output terminals for system integration

Where the AS-6085 Differs from SEG/Woodward XR-1

We completed full parameter matching and verification by retrieving official manuals and technical documents of SEG/Woodward XR-1. The comparison below proves that our protection device fully meets the replacement and equivalent application requirements:

Parameter	SEG/Woodward XR-1 Standard	Supplied device (AS-6085)	What the comparison shows
Alarm threshold	20-140 kΩ (adjustable)	20-140 kΩ (adjustable)	Same range, so the existing alarm settings transfer unchanged
Tripping threshold	0-30 kΩ (adjustable)	0-30 kΩ (adjustable)	Same range
Action delay range	0-25 s / 0-50 s (adjustable)	0-50 s, full range, adjustable	Broader: one setting covers both ranges, so no re-range is needed
Protected object	Synchronous generator rotor winding	Synchronous generator rotor winding	Same target
Working frequency	50 Hz / 60 Hz adaptive	50 Hz / 60 Hz adaptive	Same, no frequency board swap
Standards cited	IEC 60255-1:2022	IEC 60255-1:2022	Same standard body and current edition

Generator rotor earth fault protection comes in two shapes. Injection type applies a voltage across the rotor winding. Ping-pong type alternates between two injection points. Ask which one the existing unit was built around before quoting.

A rotor earth fault protection supply case is only comparable at three levels: alarm and trip thresholds, action delay, and the panel footprint.

How the Order Was Docked and Quoted

After receiving the client’s inquiry, we adopted a standardized technical verification and business docking process to ensure zero deviation between product performance and on-site demand, complying with overseas engineering project procurement specifications:

Where the XR-1 Reference Values Come From

We searched and sorted out the full official manuals, parameter sheets, protection logic descriptions and installation specifications of SEG/Woodward XR-1, sorting out core technical indicators and application limitations as the benchmark for product verification.

How the Two Devices Were Compared

Our technical team compared the self-developed rotor earth fault protection device with XR-1 in terms of protection function, parameter range, electrical performance and structural size, confirming that all technical indicators meet and partially exceed the original standard, supporting direct replacement and on-site retrofit.

What Was Confirmed Before Ordering

We sent complete product specifications, technical parameter sheets and certification documents to the client’s engineering team. Through multiple online technical communications, we confirmed the adaptability of the device to the client’s generator model, on-site voltage conditions and protection logic settings, eliminating technical risks before ordering.

Quotation Terms for the Pakistan Shipment

After technical confirmation, we issued a formal quotation with complete overseas trade terms, including the following clear and standardized terms:

• MOQ: Small batch customizable supply to meet project trial installation and batch procurement needs
• Delivery Time: Strict production cycle scheduling for overseas projects, guaranteed on-time delivery
• Payment Terms: Flexible and safe international trade payment methods, adapting to Pakistan project procurement habits
• Warranty Period: Long-term official warranty, with professional after-sales technical support
• Certifications: Complete CE, ISO and IEC standard certification documents, supporting project acceptance

What the Supplied Device Does

Protection Functions of the AS-6085

This rotor earth fault protection device is specially designed for synchronous generator rotor loop protection, solving the safety hazards of rotor winding insulation aging, damage and earth faults. It supports two-stage protection of one-point grounding alarm and two-point grounding tripping, avoiding unit vibration, shaft magnetization and equipment burnout caused by rotor faults.

• Real-time monitoring of rotor winding insulation resistance, high-precision identification of high and low impedance earth faults
• Independent adjustable alarm and tripping thresholds + delay setting, effectively preventing false operation and missing protection
• Built-in fault recording function, which can store fault parameters for post-event analysis
• Password protection parameter setting to avoid misoperation of on-site personnel
• Standard communication and relay output interfaces, convenient for docking with industrial control systems and SCADA

Fitting the Unit into the Existing XR-1 Cabinet

• Simple Structure: Standard cabinet-mounted design, compatible with the installation size of XR-1, supporting direct replacement and on-site retrofit without modifying the original cabinet structure
• Convenient Wiring: Clear screw terminal layout, standardized wiring sequence, reducing on-site installation errors
• Strong Adaptability: Wide-range AC/DC power supply, adaptable to complex power environment of Pakistan industrial power stations
• High Stability: Industrial-grade anti-interference design, suitable for long-term continuous operation in harsh industrial environments

Factory Checks Before the Shipment Left

For all Pakistan and Afghanistan overseas projects, we implement stricter production and quality inspection standards than domestic orders to ensure product stability and compliance in cross-border application scenarios.

During this project production stage we completed full-process quality control: component screening, aging test, parameter calibration and function simulation test. Each device was debugged against the client’s on-site parameter requirements before it left the factory. Protection logic, threshold accuracy and communication function were checked against the project acceptance standards. No factory defects were recorded.

Cross-Border Land Transport to Pakistan

In view of the long-distance cross-border transportation and bumpy road conditions in Pakistan, we adopted shockproof, moisture-proof and drop-proof professional export packaging for the equipment, equipped with fixed foam and waterproof film to avoid equipment damage and moisture failure during transportation.

The goods moved by standard cross-border land transport, with logistics tracking throughout. Customs declaration, document verification and handover were done against Pakistan’s import rules. The equipment reached the client’s site intact.

Remote Commissioning and Acceptance Tests

After the equipment arrived at the site, our electrical engineers gave the Pakistan client technicians one-on-one remote guidance. On-site staff fixed the unit, checked the wiring, set the parameters and debugged the protection logic step by step. Simulation fault tests were run at the same time. Once the protection action was confirmed accurate, the client closed the on-site acceptance and filed the data. The unit has run stably since it was energised.

What Pacific Engineering Supplies After the Sale

Conclusion

This rotor earth fault protection supply case closed once the simulation tests passed and the client held the acceptance record. Three things decide whether a replacement goes ahead: the alarm and trip ranges have to match the unit already in service, the relay has to fit the existing XR-1 footprint without cabinet changes, and the injection principle has to be the one the machine was built for. Repeat supply follows the same 64R supply case Pakistan pattern.

Related reading

• Rotor earth fault protection for generators is the parent guide this supply case sits under: where 64R sits in a generator protection scheme.
• 64R protection relay covers the ANSI function 64R device in general, including setting ranges and wiring.
• 64R rotor earth fault protection relay is the product the AS-6085 is listed under.
• Voltage injection rotor earth fault protection explains the injection principle used here and how it differs from the ping-pong type.

Pacific Engineering provides long-term stable supply and full-cycle technical services for power system protection equipment equivalent to SEG/Woodward XR-1. For EPC contractors, power plant owners and industrial engineering clients in Pakistan, Afghanistan and surrounding regions, we can provide:

• Equivalent replacement solutions for imported generator protection relays
• Custom parameter configuration and project-oriented technical docking
• Batch stable supply, fast delivery and complete certification documents
• Full-process after-sales services including remote commissioning, operation guidance and warranty maintenance

Contact us for generator rotor earth fault protection devices, medium and low voltage power protection systems, and industrial automation solution support. We provide reliable, cost-effective and fully compliant electrical equipment supply services for your overseas power engineering projects.