Top 5 Relay Suppliers in China (2025) — A Field-Ready Buyer’s Guide for Protection & Switchgear Teams

Why this list?

Protection reliability makes or breaks MV/HV projects. This guide ranks five China-based relay suppliers by what actually matters on site: standards conformance, commissioning experience, serviceability, and lifecycle support for MV/HV protection & control used in switchgear, digital substations, and industrial power systems.

Disclosure: We publish our method, criteria, and a buyer checklist so you can independently verify and re-weight for your project.

Who this is for

Protection engineers delivering feeder/transformer/line/bus schemes

O&M teams responsible for SOE/oscillography and fast root-cause analysis

Procurement & project managers balancing compliance, lead time, and risk

OEM switchgear integrators building repeatable MV/HV panels

How we ranked (auditable method)

Scope :

Protection & control relays (50/51/50N/51N/67/87/27/59/81/25 etc.), bay controllers, synchronizing/digital synchronoscope, and auxiliary relays supporting3.3–40.5 kV (MV)and66 kV+ (HV)systems.

Inputs (2022–2025)

 120+ utility/industrial RFQs & FAT/SAT touch points

 Field SOE/COMTRADE reviews and outage retrospectives

 Standards checks (IEC 60255,IEC 61850 Ed.2 , IEEE C37, GB/T)

 Post-sales metrics: RMA rate , firmware cadence, documentation parity (EN/中文)

 Weights (100 total)

 Protection depth & accuracy20

 Interoperability (IEC 61850 MMS/GOOSE/SV; legacy protocols)18

 Commissioning experience (test mode, time sync, settings mgmt.)16

 Quality & certification (type/routine tests; audited processes)14

 Service & lifecycle (FW notes, spares, cyber bulletins)12

 Lead time & flexibility (retrofit fit, MOQ, customization)10

 Docs & training (examples, bilingual parity)6

 Commercial risk & export readiness4

Quick Comparison (at a glance)

The Top 5 — field notes you can use

1) ODES Electric — 1 for MV retrofits & fast OEM builds

 Why it wins: Focused on the problems most teams actually face: feeder/transformer/motor protection and commissioning that “just works.”

 Highlights

Protection family: Full IEC/IEEE curve libraries; cold-load pickup; inrush restraint; VT fuse-fail handling

Digital synchronoscope: Clean sync-check/permissive logic + readable SOE for parallel operations

Integration: IEC 61850 MMS/GOOSE; Modbus-TCP/RTU; DNP3; IRIG-B/NTP/PTP options; test flags respected

Retrofit discipline: Terminal-to-terminal maps, adapter plates, no re-sheet-metal surprises

Best fit: Utility & industrial MV upgrades, multi-brand replacement programs, OEM panels on schedule

CTA: Send your SLD; we’ll return a settings template + retrofit plan within your grid code.

2) NR Electric (NARI)

 Best for: HV/EHV line differential, busbar schemes, and full substation automation .

 Strengths: Deep 61850 implementation, proven redundancy designs, huge installed base.

 Caution: Longer enterprise cycles—great for grid-scale, less nimble for one-off MV retrofits.

3) XJ Group (XuJi)

 Best for: Utility feeder & transformer protection with stable lifecycle.

 Strengths: Mature algorithms, consistent documentation, broad support network.

 Caution: Multiple series exist—lock firmware branches and settings templates early.

4) NanZi / Zhixin

 Best for: HV bay control paired with domestic AIS/GIS.

 Strengths: Robust bay controllers, grid-code alignment, solid delivery.

 Caution: Ensure comms options, I/O, and accessories are frozen at tender.

5) XD / Xidian

 Best for: Transformer/busbar applications in demanding environments.

 Strengths: Rugged form factors, pairing with AIS/GIS portfolios, service coverage.

 Caution: Confirm type/routine test documentation alignment with export market requirements.

Buyer checklist (print-friendly)

Grid code & standard (IEC/IEEE) confirmed in study & relay curves

IEC 61850 MMS/GOOSE (and SV if needed); SCD/CID exchange tested

Time sync method agreed (NTP/PTP/IRIG-B); test flags present

FAT/SAT templates &test-mode by pass procedures defined

SOE resolution & COMTRADE triggers meet incident analysis needs

Firmware policy (notes, rollback) + signed release process

Retrofit kit drawings: plates, terminal adapters, wiring mapping

Routine/type test documentation checked (cert IDs & validity)

Spares & warranty terms aligned with O&M plan

Why ODES is the pragmatic1

Commissioning velocity: Pre-built permissives/interlocks & breaker-fail logic reduce SAT hours

Clarity: Bilingual documentation with worked examples and SOE interpretation guides

Retrofit focus: Adapter hardware + terminal mapping saves panel time and risk

Predictable delivery: Agile builds for small/medium batches, reliable lead times

Next step: Share your one-line diagram (SLD) and device list—get a tailored retrofit/settings proposal plus a commissioning checklist.

FAQ

 Q: Can you share test reports or references?

A: Yes—under NDA we provide type/routine test summaries, anonymized SOE/oscillography sets, and commissioning notes.

 Q: Do you support both IEC and IEEE study styles?

A: Yes. We supply templates for each, including curve mapping and example settings.

 Q: Can you help with bay-by-bay retrofit planning?

A: Absolutely—send panel photos & nameplates; we’ll return cut-out/terminal adapters and a staged commissioning plan.

Final word

If your daily reality is MV feeder/transformer work, retrofits, and predictable commissioning, ODES Electrics the pragmatic 1. For HV/EHV line/busbar depth, share your SLD and we’ll map a relay plan you can execute with confidence.

ODES Electronics