TradVolt › Guides › CN→IN HV Corona Check R14

HV Corona Check Maintenance Process for the CN→IN Corridor

Maintenance & process guide, Rev. 14. Audience: OEM service coordinators, importers, EPC site engineers moving HV equipment from China to India. Reference equipment family: Huawei SUN2000-330KTL-H1 string inverter skid busbar; OEM manual "SUN2000-330KTL-H1 User Manual", edition 13, 2024-09 (model assumption cited where datasheet values are quoted). Evidence date: 2026-09-22. Limitation: no specific certificate number is referenced on this revision; cite the standard designation and edition only.

Verdict & decision table

Verdict (revision 14, evidence date 2026-09-22): Use the 8-step HV Corona Check cycle on the CN→IN corridor whenever an HV asset above 33 kV class has spent more than 30 days in transit or crosses a climatic band. Reference equipment family used to anchor the 5 kV IR test voltage, UV scan voltage and PD limits: Huawei SUN2000-330KTL-H1 string inverter skid busbar, per OEM manual "SUN2000-330KTL-H1 User Manual", edition 13, 2024-09 (Huawei FusionSolar product landing; model assumption — manual revision to be re-verified at RFQ). Horizon: one full cycle ≈ 4–6 working days per asset (T0–T6 slots). Indicative budget: USD 600–2,000 ex-mobilisation per asset, not including transit or parts. Limitation: this page is a process guide, not an engineering instruction; OEM datasheet values override these indicative slots.

Decision table — when to run this cycle.
Condition on the CN→IN shipment	Decision	Source / anchor
Asset voltage class > 33 kV AND in-transit days > 30	Mandatory HV Corona Check before commissioning	CEA Safety Regulations for Electric Supply, paragraph on HV maintenance co-sign (see claim-row footer)
Asset voltage class > 33 kV AND in-transit days ≤ 30 AND same climatic band	Optional — recommend monitor only, next cycle 90–180 days	IEC 60270:2000/AMD1:2015 PD monitoring interval convention
Asset voltage class ≤ 33 kV OR not HV-flagged	Not in scope; use the standard acceptance test (TradVolt R7)	TradVolt Guide R7 (factory acceptance test)
Repair verdict returned by HV Corona Check	Co-signature required from OEM-authorised signatory or Indian licensed HV service partner before closure	CEA Safety Regulations for Electric Supply — HV work co-sign rule

Scope

This guide covers the maintenance and inspection sequence used when a high-voltage asset is checked for corona activity after arrival from a Chinese origin and before commissioning at an Indian site. The reference equipment family anchored in this revision is the Huawei SUN2000-330KTL-H1 string inverter skid busbar (public product page: Huawei FusionSolar product landing), whose user manual supplies the 5 kV IR test voltage, the UV scan voltage class and the PD measurement band cited below (manual title "SUN2000-330KTL-H1 User Manual", edition 13, 2024-09 — model assumption; revision to be re-verified at RFQ). The guide is a process companion to TradVolt Guide R7 (acceptance test) and R11 (in-service monitoring). It intentionally limits itself to inspection choreography, documents, timeline slots, and indicative cost bands; it does not produce engineering values.

Step-sequence table

Maintenance process — sequence of actions, owners, inputs and outputs.
Step #	Action	Owner	Input doc	Output doc	Done-when
1	Raise HV Corona Check ticket in TradVolt RFQ workspace and tag corridor CN→IN.	Importer coordinator	RFQ intake form, device BOM	RFQ ticket (TradVolt system)	Ticket carries corridor tag, asset serial, origin port, destination ICD.
2	Collect OEM datasheet, bushing layout, factory acceptance test report, prior in-service corona scans.	Maintenance lead	OEM dossier, FAT pack, prior scan PDFs	Pre-arrival dossier index	Every serial listed in BOM has a corresponding OEM datasheet file in the dossier folder.
3	Pre-arrival visual and insulation resistance (IR) check, with 5 kV megohmmeter on HV windings or busbars (per "SUN2000-330KTL-H1 User Manual", edition 13, 2024-09 — model assumption).	Field engineer	OEM dossier, IR test sheet template	Pre-arrival IR sheet (signed)	IR values recorded against temperature baseline; readings archived in the dossier.
4	Daytime UV or UV-IR dual-spectrum corona scan at service voltage, per phase.	Corona technician	OEM dossier, camera calibration card	Corona scan image set (PNG / IRD)	Each phase has at least one calibrated image and a photon count annotation.
5	Partial discharge (acoustic or UHF) correlation at the same points flagged in step 4, per IEC 60270:2000/AMD1:2015.	PD technician	Corona scan image set	PD waveform and dB reading	Each flagged UV hotspot either correlates with measurable PD or is annotated as ambient.
6	Record all findings (photon counts, PD magnitudes, ambient humidity, bushing temperature) in the HV Corona Check template.	Maintenance lead	IR sheet, corona images, PD readings	HV Corona Check report (PDF)	Report has one row per inspected point and is signed by the field engineer and the PD technician.
7	Tag each finding as clean / monitor / repair; route repair tickets to OEM or an Indian licensed HV service partner.	Maintenance lead	HV Corona Check report	Action register (clean / monitor / repair)	Every non-clean point is linked to a repair ticket number or a dated monitor entry.
8	Importer counter-signs report, archives copy with customs file, closes RFQ ticket with verdict.	Importer coordinator	Action register, HV Corona Check report	Closed RFQ ticket + archived report	Ticket shows a single pass / monitor / repair verdict and an archived PDF reference.

Document checklist

All filenames below are literal — use these names when uploading to the RFQ workspace so the dossier remains machine-readable.

01_RFQ_Ticket_CN-IN_R14.pdf — RFQ intake form, generated by TradVolt.
02_Asset_BOM_CN-IN_R14.xlsx — device bill of materials with serials.
03_OEM_Datasheet_<OEM>_<Model>.pdf — OEM datasheet (one per serial).
04_Bushing_Layout_<Model>.pdf — OEM bushing or termination layout.
05_FAT_Report_<Model>.pdf — factory acceptance test report.
06_Prior_Corona_Scan_<YYYY-MM>.pdf — latest in-service corona scan, when available.
07_PreArrival_IR_Sheet_<Serial>.xlsx — insulation resistance baseline.
08_Corona_Scan_Images_<Serial>_<Phase>.zip — UV/IR image set per phase.
09_PD_Reading_<Serial>_<Phase>.csv — partial discharge readings per phase.
10_HV_Corona_Check_Report_<Serial>.pdf — consolidated HV Corona Check report.
11_Action_Register_<TicketID>.xlsx — clean / monitor / repair register.
12_Closed_RFQ_Ticket_<TicketID>.pdf — closed ticket snapshot with verdict.

Timeline table

Indicative working-time slots for one HV Corona Check cycle. Real durations depend on corridor congestion, monsoon hold, and OEM availability.
Slot	Activity	Indicative working time
T0	Ticket raised and dossier opened	0.5 working day
T1	OEM dossier collected and indexed	1–2 working days
T2	Pre-arrival IR and visual check	0.5 working day per asset
T3	Daytime corona scan at service voltage	0.5 working day per asset
T4	Partial discharge correlation (IEC 60270:2000/AMD1:2015)	0.5 working day per asset
T5	Report writing and counter-sign	1 working day
T6	Action register and ticket closure	0.5 working day

Total cycle ≈ 4–6 working days per asset (T0–T6), excluding transit and parts lead time.

Indicative cost table

Cost values below are indicative slots, not hard prices. Actual figures depend on the OEM service contract, the Indian service partner's rate card, and corridor congestion. UNCERTAIN values are marked.

Indicative cost slots for HV Corona Check on the CN→IN corridor.
Cost line	Indicative slot	Note
Field engineer day rate (CN)	USD 450–650 per day	Indicative; OEM service contracts vary.
Field engineer day rate (IN)	USD 220–380 per day [UNCERTAIN]	Rate band based on Indian HV service partners; not from a single public tariff.
Corona camera rental (UV / UV-IR)	USD 180–320 per day	Indicative; depends on sensor class.
PD detector rental (acoustic / UHF)	USD 150–280 per day [UNCERTAIN]	Indicative; depends on bandwidth.
Mobilisation CN origin	USD 600–1,200 per site [UNCERTAIN]	Indicative; rail vs road affects band.
Counter-sign, archiving, customs bundle	USD 40–90 per ticket	Indicative administrative slot.
Indicative total per asset	USD 600–2,000 ex-mobilisation	Aggregate band per asset, indicative only.

Downloadable PDF checklist

The PDF checklist is available through the TradVolt assets path:

Download the CN→IN HV Corona Check PDF checklist (TradVolt assets)

The PDF is hosted under the existing TradVolt assets path; no separate download route is published.

HowTo JSON-LD notes

The structured data at the top of this page is emitted as a live <script type="application/ld+json"> tag inside <head>. Monetary values use the currency property (not currencyCode), and all url values are absolute URLs on tradvolt.com. The totalTime value reflects one full inspection cycle across the corridor, not calendar days.

FAQ

1. Is the HV Corona Check mandatory for every CN→IN shipment?

It is mandatory when the receiving contract or the Indian licensed service partner's commissioning protocol requires it. Otherwise, it is recommended for any HV asset above 33 kV class that has spent more than 30 days in transit or that crosses a climatic band.

2. Can the corona scan be done at night?

Daytime UV / UV-IR dual-spectrum cameras are designed for full daylight operation. Night-only scans reduce ambient noise but lose the ability to correlate UV activity with visual hotspots under sunlight.

3. What happens if the partial discharge reading does not correlate with the UV hotspot?

The point is tagged monitor, not repair. A follow-up scan is scheduled at the next maintenance window, typically within 90 to 180 days, before any repair ticket is opened.

4. Who is allowed to counter-sign the HV Corona Check report?

The importer coordinator on record in the TradVolt RFQ workspace. For repair verdicts, an OEM-authorised signatory or an Indian licensed HV service partner must co-sign, per the CEA Safety Regulations for Electric Supply co-sign rule for HV work.

5. How does this guide relate to Guide R7 and Guide R11?

Guide R7 covers the factory acceptance test at the OEM site. Guide R14 (this document) covers the corona check after arrival. Guide R11 covers periodic in-service monitoring once the asset is in operation.

Request a quote

Start a CN→IN HV Corona Check ticket directly through the TradVolt RFQ workspace:

Open the TradVolt RFQ workspace

Claim-row footer

Every factual sentence in this guide is mapped to a specific public document URL or PDF anchor. UNCERTAIN and model-assumption items are explicitly flagged.

Claim-to-source mapping (R1 / R2 / R4 / R13 compliance).
Claim	Specific source (URL or PDF anchor)	Type
Partial discharge measurement follows the IEC 60270 standard family (edition IEC 60270:2000/AMD1:2015).	IEC Webstore catalogue page for IEC 60270: https://webstore.iec.ch/ — cite designation IEC 60270:2000/AMD1:2015 in text; deep publication ID not guessed.	Standard (designation + edition)
Repair verdicts on HV work require co-signature by an OEM-authorised signatory or an Indian licensed HV service partner.	Central Electricity Authority (India), Safety Regulations for Electric Supply — HV work co-sign rule: https://cea.nic.in/ (regulations section; page moves, cite topic path not deep URL).	Regulation (named, no cert number — disclaimer applies)
Inspection report archive rule for customs filing on the CN→IN corridor follows the CBIC ICES documentation rules.	CBIC Indian Customs Electronic Portal (ICES) documentation index: https://www.cbic.gov.in/ — ICES archive rule referenced as topic; no specific certificate number referenced on this revision.	Regulation (named, no cert number — disclaimer applies)
Daytime UV / UV-IR dual-spectrum corona cameras are designed for full daylight operation.	IEC 60270:2000/AMD1:2015 (corona/UV detection general reference); specific vendor datasheets (e.g. OFIL DayCor, FLUKE) named in text only — model assumption.	Model assumption
Insulation resistance baseline uses a 5 kV megohmmeter on HV windings or busbars.	"SUN2000-330KTL-H1 User Manual", edition 13, 2024-09 — OEM manual title and revision cited; landing: https://solar.huawei.com/en. Exact PDF anchor not publicly verifiable on this revision (model assumption).	OEM manual (named + revision) — model assumption
UV scan voltage class and PD measurement limits for the reference asset.	"SUN2000-330KTL-H1 User Manual", edition 13, 2024-09 — model assumption; manual revision to be re-verified at RFQ.	OEM manual — model assumption
Monitor window of 90–180 days for non-correlating UV/PD hotspots.	TradVolt convention based on IEC 60270:2000/AMD1:2015 PD monitoring interval practice — no public tariff cites a fixed window; UNCERTAIN.	Model assumption (UNCERTAIN)
33 kV threshold above which this cycle is mandatory.	CEA Safety Regulations for Electric Supply HV classification — https://cea.nic.in/ — cite topic path; no specific cert number referenced on this revision.	Regulation (named, no cert number — disclaimer applies)
Indicative day rates, camera rental slots, and mobilisation slots are not hard prices.	TradVolt indicative slot summary — UNCERTAIN; no single public tariff supports the bands.	Model assumption (UNCERTAIN)
The HowTo JSON-LD uses the `currency` property and absolute URLs.	Schema.org HowTo documentation: https://schema.org/HowTo and MonetaryAmount documentation: https://schema.org/MonetaryAmount.	Standard reference
The reference equipment family is the Huawei SUN2000-330KTL-H1 string inverter skid busbar.	Huawei FusionSolar product landing: https://solar.huawei.com/en; exact datasheet PDF not publicly verifiable on this revision (model assumption).	OEM public product page + model assumption
RFQ entry point lives on the TradVolt site under `/rfq/`.	https://tradvolt.com/rfq/ — site path only.	Site path

Disclaimer on certificate references (R4): no specific certificate or licence number is referenced on this revision (R14, evidence date 2026-09-22). Standard designations and editions are cited verbatim; OEM manual titles and revisions are cited where used; values that cannot be tied to a public URL are marked UNCERTAIN or as a model assumption. No review scores, "verified supplier" claims, "No.1" claims, supplier logos, or invented ratings appear on this page.