Slug: /guides/cn-in-hv-disconnector-r14/ — TradVolt Maintenance & Process Series, Revision 14 — Evidence date: 2026-09-22.
Scope decision (1 product line, 5 indicators): This guide covers maintenance and the CN→IN import process for the Sieyuan Electric GW4A-145/2500-40 outdoor HV AC disconnector (145 kV, 2500 A, 40 kA peak withstand, single-break rotating-insulator type), OEM manual "Sieyuan HV Disconnector Installation & Operation Manual, GW4A Series, Rev. 3, dated 2024-06". It does NOT cover earthing switches, motorized mechanisms, indoor switchgear panels, or HV cables. Equipment type: HV AC disconnector (outdoor, double-column). Location: Chinese OEM plant → Indian substation site. Horizon: pre-shipment through commissioning. Limitation: all customs duty rows are PENDING and must be re-checked against ICEGATE Tariff and DGTR trade-remedy portal on the date of quotation. Indicative share figures are placeholders expressed in % of CIF landed value per shipment (1×40' FCL, approx. 8–12 units, 18 t net weight, 36 m³ volume, 145 kV class) unless otherwise stated.
| Item | Value |
|---|---|
| Equipment model / family | Sieyuan Electric GW4A-145/2500-40 (HV AC disconnector, 145 kV, 2500 A) |
| OEM manual reference | Sieyuan HV Disconnector Installation & Operation Manual, GW4A Series, Rev. 3 (2024-06) |
| Trade corridor | CN port (Shanghai / Ningbo) → IN port (Nhava Sheva / Mundra / Chennai) → substation site |
| Horizon covered | Pre-shipment → customs clearance → inland → mechanical & electrical commissioning |
| Evidence date | 2026-09-22 (IEC standard edition, OEM manual rev, BIS / CEA links cited as-of this date) |
| Limitations | Customs duty rows PENDING; sea-transit range model-assumption; add-on equipment (earthing switch, motor drive) out of scope |
| HS sub-heading (model assumption) | 8535.30 — isolating switches and make-and-break switches (verify against ICEGATE Tariff) |
Each step has a single accountable owner. Inputs and outputs are the literal documents or artefacts that should be produced or consumed.
| Step# | Action | Owner | Input Doc | Output Doc | Done-when |
|---|---|---|---|---|---|
| 1 | Receive pre-shipment documents from supplier | Procurement Engineer (IN) | Sieyuan GW4A-145 datasheet; type-test report; MTC; PO | Document receipt log entry in ERP | All 5 docs logged with file hash and Sieyuan Rev. 3 manual reference recorded |
| 2 | Verify HS classification and applicable duties | Customs Broker (IN) | Sieyuan GW4A-145 datasheet; commercial invoice draft | HS classification memo (HS 8535.30 as model assumption, pending broker confirmation) | HS sub-heading confirmed on ICEGATE; duty table populated with pending rows |
| 3 | Arrange third-party pre-shipment inspection | QA Engineer (IN) | Sieyuan GW4A-145 datasheet; ITP | PSI report (signed) | PSI marked PASS or list of NCRs closed against Sieyuan datasheet values |
| 4 | Book freight CN port → IN port → site | Logistics Coordinator (IN) | Packing list; commercial invoice | Booking confirmation; Bill of Lading | Container loaded; BL released (FIATA Bill of Lading) |
| 5 | File Bill of Entry and clear customs | Customs Broker (IN) | BL; commercial invoice; packing list; COO; MTC; type-test report | Out of Customs (OOC) certificate | BCD + IGST + SWS paid via ICEGATE; OOC obtained |
| 6 | Receive and unload at Indian site | Site Stores In-charge | Delivery challan; OOC certificate | Goods Receipt Note (GRN) | GRN posted in ERP; damage notes attached if any (ISPM 15 wood-packaging compliance check) |
| 7 | Mechanical inspection of disconnector | Site Electrical Engineer | Sieyuan Installation & Operation Manual Rev. 3 (2024-06); PSI report | Mechanical inspection sheet | All checklist lines signed per Sieyuan §4 Mechanical Inspection |
| 8 | Electrical insulation and contact tests | Commissioning Engineer | Sieyuan test procedure §5; IEC 62271-102:2013/A1:2024 | Electrical test report | Insulation resistance > 10 000 MΩ; contact resistance < 35 µΩ at 2500 A; power-freq. withstand @ 250 kV / 1 min PASS |
| 9 | Lubrication and torque verification | Maintenance Technician | Sieyuan torque table §8.2; Klüber Isoflex Topas L 32 spec | Torque log sheet | M12 terminal bolts torqued to 70 N·m; M16 to 140 N·m; each joint signed |
| 10 | File maintenance record in CMMS | Maintenance Planner | Mechanical sheet; electrical report; torque log | CMMS work-order closure | WO status = CLOSED with all 3 attachments |
Tick each item once the literal file with that filename is present in the project folder or ERP attachment tab.
| Phase | Activity | Indicative Working Days (low) | Indicative Working Days (high) | Indicative Midpoint (WD) | Basis / Unit |
|---|---|---|---|---|---|
| Pre-shipment | Docs collection, HS lookup on ICEGATE, PSI | 7 | 10 | 8.5 | per shipment, 1×40' FCL, approx. 8–12 units |
| Sea transit | CN port → IN port (model assumption: Shanghai → Nhava Sheva) | 10 | 18 | 14 | per shipment, direct carrier rotation, monsoon-excluded |
| Customs | BoE filing via ICEGATE, duty payment, examination, OOC | 3 | 7 | 5 | per shipment, Indian port, no DRI hold |
| Inland | IN port → site, unloading, GRN | 2 | 5 | 3.5 | per shipment, ≤ 250 km road leg |
| Site commissioning | Mechanical + electrical + torque (Steps 7–9) | 3 | 6 | 4.5 | per unit (8–12 units per FCL) |
| Total indicative (per shipment) | Door-to-commissioned | 25 | 46 | 35.5 | sum of phase midpoints; not calendar days |
UNCERTAIN (model assumption): Sea-transit duration varies by origin port (Shanghai / Ningbo / Shenzhen), destination port (Nhava Sheva / Mundra / Chennai), carrier rotation, monsoon disruptions (Jun–Sep at Indian west coast), and Indian port congestion. Confirm with the nominated freight forwarder before locking the project schedule. The 25–46 WD total is per shipment and assumes one container; multi-container projects scale linearly on the pre-shipment and inland rows.
| Cost Slot | Description | Indicative Share (% of CIF) | Indicative Midpoint | Basis |
|---|---|---|---|---|
| EXW unit price (Sieyuan GW4A-145/2500-40) | Goods ex-works China (supplier quote) | Indicative — request quote | n/a (model assumption) | per unit, USD |
| Ocean freight | FCL 40' CN → IN | Indicative 3.0 – 5.0 % | 4.0 % | per shipment, per FCL |
| Marine insurance | Institute Cargo Clauses (A), 110 % of CIF | 0.30 – 0.50 % | 0.40 % | per shipment, of CIF value |
| BCD (HS 8535.30 model assumption) | Basic Customs Duty, India | PENDING — verify on ICEGATE Tariff | n/a | per shipment, % of assessable value |
| IGST | Integrated GST at customs (CIF + BCD + SWS) | PENDING — verify current GST slab | n/a | per shipment, % of taxable value |
| Social Welfare Surcharge (SWS) | On BCD, if applicable | PENDING | n/a | per shipment, % of BCD |
| ADD / Safeguard duty | If DGTR trade-remedy order covers 8535.30 | PENDING — check DGTR portal | n/a | per shipment, % of CIF |
| CHA / Broker fee | Customs House Agent charges | 0.15 – 0.25 % | 0.20 % | per shipment, fixed-per-shipment INR |
| PSI fee (TUV / BV / SGS) | Third-party pre-shipment inspection | 0.20 – 0.40 % | 0.30 % | per shipment, per man-day (model assumption 2 man-days) |
| Inland transport | IN port → project site, flatbed | 1.0 – 2.0 % | 1.5 % | per shipment, per tonne-km (model assumption ≤ 250 km) |
| Commissioning labour | Site contractor team, mechanical + electrical + torque | 1.5 – 3.0 % | 2.25 % | per shipment, per day (model assumption 3 days) |
Disclaimer: All non-military % values above are indicative placeholders only. No rate, percentage, or fee should be quoted to the client without re-checking against (a) the live Indian Customs Tariff on icegate.gov.in, (b) the latest CBIC notifications on cbic.gov.in, (c) the DGTR trade-remedy portal on dgtr.gov.in, (d) the BIS / CEA technical-specification lists on bis.gov.in / cea.nic.in, and (e) a written freight forwarder and inspection-body quotation. All percentages are expressed as a share of CIF landed value per shipment (1×40' FCL, 8–12 units, 145 kV class) unless otherwise noted.
| Field | Value | Citation |
|---|---|---|
| Likely HS sub-heading (electrical apparatus for switching > 1000 V) | 8535.30 — isolating switches and make-and-break switches (model assumption; verify on ICEGATE) | ICEGATE Tariff |
| BCD | PENDING — confirm at ICEGATE Tariff entry for 8535.30 | ICEGATE Tariff |
| IGST | PENDING — confirm current GST slab (18 % or 28 %) | CBIC GST rate schedule |
| SWS | PENDING — confirm SWS rate on BCD | CBIC Customs Tariff Act 1975 |
| ADD / CVD / Safeguard | PENDING — verify DGTR portal for 8535.30 | DGTR trade-remedy portal |
| Applicable BIS standard (model assumption) | IS 9920 (HV AC disconnectors and earthing switches) — verify against BIS catalogue | BIS catalogue |
| Applicable CEA reference | CEA Technical Standards for Construction of Electric Plants & Electric Lines | CEA Regulations & Standards |
Disclaimer: HS classification is product-specific. The OEM datasheet rating, terminal type, and whether the disconnector is rated above 1000 V determine the exact sub-heading. Treat all duty figures as PENDING until the customs broker issues a signed classification memo referencing a specific Customs Ruling or Tariff Advice on ICEGATE. HS 8535.30 is presented here as a model assumption for the Sieyuan GW4A-145 family and is not a confirmed ruling.
Q1. Which IEC standard applies to HV disconnectors in India?
A. IEC 62271-102:2013/A1:2024 — "High-voltage switchgear and controlgear — Part 102: Alternating current disconnectors and earthing switches" — is the commonly referenced product standard. Indian utilities may additionally reference IS 9920 (BIS) or CEA technical standards. The full standard catalogue is searchable on the IEC Webstore. (Source: IEC 62271-102:2013/A1:2024 title page, IEC Webstore.)
Q2. Is a third-party pre-shipment inspection mandatory?
A. It is not legally mandatory in India for private buyers, but most utilities, EPC contractors, and prudent buyers include a PSI clause in the purchase order to reduce the risk of receiving non-conforming goods. Inspection bodies (TUV Rheinland, Bureau Veritas, SGS) publish their PSI service-line sheets for process deliverables. (Source: buyer PO terms; inspection-body service-line sheets.)
Q3. Can the supplier's Chinese test report be accepted in lieu of an Indian lab test?
A. Acceptance depends on the buyer's specification. Indian utilities following CEA Technical Standards for Construction of Electric Plants and Electric Lines (CEA) or PGCIL specifications often require type tests from NABL-accredited or internationally accredited labs whose accreditation is mutually recognised. (Source: CEA Technical Standards for Construction of Electric Plants and Electric Lines; PGCIL technical specifications.)
Q4. What is the typical warranty period?
A. OEM warranties for HV disconnectors are commonly 12 to 24 months from dispatch or commissioning, whichever is earlier. The exact period must be read from the OEM warranty certificate accompanying the shipment. (Source: Sieyuan warranty certificate accompanying shipment.)
Q5. Are there any export controls on HV disconnectors from China?
A. Certain high-voltage apparatus above specified ratings may fall under Chinese export-control lists administered by MOFCOM. The Chinese supplier is responsible for obtaining any required export licence; the Indian buyer should request written confirmation. (Source: MOFCOM Export Control Law of the PRC (2020) and the dual-use export-control list.)
Q6. Does the Sieyuan GW4A-145 carry a published type-test certificate?
A. Yes — the Sieyuan GW4A-145/2500-40 type-test report covers IEC 62271-102:2013/A1:2024 clauses 6 (dielectric tests), 7 (radio-interference tests) and 8 (making / breaking / short-time withstand). The certificate was issued by the Sieyuan in-house Power Transmission & Distribution Equipment Test Centre. An ASTA / KEMA-style third-party certificate (issued by an internationally accredited lab such as CESI, KEMA, or ASTA) is not yet issued for this family as of the evidence date (2026-09-22) — request a fresh certificate status check at the RFQ stage. (Source: Sieyuan Type Test Report GW4A-145/2500-40, 2024; ASTA Intertek certification database.)
| Interval | Task | Reference |
|---|---|---|
| Monthly | Visual check, infrared (IR) scan of contacts at load | Sieyuan O&M Manual GW4A Rev. 3 §9.1 |
| Half-yearly | Contact resistance measurement (≤ 35 µΩ at 2500 A); lubrication of operating mechanism with Klüber Isoflex Topas L 32 | Sieyuan O&M Manual GW4A Rev. 3 §9.2 |
| Yearly | Insulation resistance test (5 kV, > 10 000 MΩ); torque re-check on terminal bolts (M12 = 70 N·m, M16 = 140 N·m) | Sieyuan O&M Manual GW4A Rev. 3 §9.3 |
| 3–5 yearly | Power frequency withstand voltage test (off-line, 250 kV / 1 min across open contacts) | IEC 62271-102:2013/A1:2024 Clause 6; Sieyuan §9.4 |
| Claim | Source | Specific Document / URL |
|---|---|---|
| Equipment family covered is the Sieyuan Electric GW4A-145/2500-40 HV AC disconnector (145 kV, 2500 A, 40 kA peak) | Sieyuan Electric OEM | Sieyuan GW4A-145/2500-40 OEM Datasheet, Rev. 3, 2024-06 (hosted on sieyuan-electric.com product pages — exact deep PDF link to be issued at RFQ; manual cited as Sieyuan Installation & Operation Manual, GW4A Series, Rev. 3, 2024-06) |
| IEC 62271-102:2013/A1:2024 covers HV AC disconnectors and earthing switches | IEC | IEC 62271-102:2013/A1:2024, "High-voltage switchgear and controlgear — Part 102: Alternating current disconnectors and earthing switches", title page. IEC Webstore catalogue entry: webstore.iec.ch (search designation 62271-102:2013/A1:2024) |
| Indian utilities may reference IS 9920 / IS/IEC 62271-102 | Bureau of Indian Standards | BIS catalogue entry for IS 9920 (HV AC disconnectors and earthing switches), bis.gov.in product catalogue |
| Indian utilities may reference CEA Technical Standards for Electric Plants & Lines | Central Electricity Authority, India | CEA Technical Standards for Construction of Electric Plants and Electric Lines, Regulations & Standards section, cea.nic.in |
| Customs duties in India comprise BCD, IGST, SWS, and any ADD / Safeguard / CVD | CBIC | Customs Tariff Act, 1975 (as amended), text on cbic.gov.in; see also Explanatory Notes to the First Schedule to the Customs Tariff Act, 1975 |
| HS classification for HV switching apparatus is sub-heading 8535.30 (model assumption — pending broker confirmation) | ICEGATE | ICEGATE Tariff entry for sub-heading 8535.30, icegate.gov.in (search tariff heading 8535) |
| HS classification lookup is performed on the ICEGATE Tariff search | CBIC / ICEGATE | ICEGATE Tariff search interface, icegate.gov.in |
| Trade-remedy orders (anti-dumping, safeguard, CVD) are published by DGTR | Department of Commerce, India | DGTR trade-remedy portal, dgtr.gov.in — list of investigations and orders |
| Third-party inspection bodies named (TUV Rheinland, Bureau Veritas, SGS) offer PSI for electrical equipment | TUV Rheinland / Bureau Veritas / SGS | Inspection service-line sheets (TUV Rheinland Industrial Services brochure; Bureau Veritas Industry & Infrastructure; SGS PSI service-line) |
| Sea-transit duration between CN and IN ports is typically 10–18 working days (model assumption) | Freight forwarder practice | UNCERTAIN — model assumption only; confirm with the nominated forwarder's carrier rotation list |
| Marine insurance standard is Institute Cargo Clauses (A) at 110 % of CIF | Institute of London Underwriters / Lloyds Market Association | Institute Cargo Clauses (A) — LMA/JCC standard wording (Lloyd's Market Association, LMA_ICC_A_2009 wording) |
| Bill of Lading is the standard FIATA multimodal/sea transport document | FIATA | FIATA Bill of Lading standard form, fiata.org documents section |
| Wood packaging must comply with ISPM 15 | IPPC | ISPM 15 — International Standards for Phytosanitary Measures No. 15, IPPC ISPM list, ippc.int |
| Export-control lists in China are administered by MOFCOM under the Export Control Law of the PRC (2020) | MOFCOM, PRC | Export Control Law of the People's Republic of China (2020) and the dual-use export-control list, MOFCOM Trade Relief and Remedy Bureau publications |
| Klüber Isoflex Topas L 32 is the OEM-approved grease for the GW4A operating mechanism | Sieyuan / Klüber Lubrication | Sieyuan Installation & Operation Manual GW4A Rev. 3 §8.2; Klüber Isoflex Topas L 32 product information sheet |
| Terminal-bolt torque values: M12 = 70 N·m, M16 = 140 N·m (Sieyuan GW4A Rev. 3 §8.2) | Sieyuan Electric OEM | Sieyuan Installation & Operation Manual, GW4A Series, Rev. 3, 2024-06, §8.2 Torque Table |
| Insulation-resistance acceptance criterion: > 10 000 MΩ; contact-resistance acceptance: < 35 µΩ at 2500 A; power-frequency withstand: 250 kV / 1 min across open contacts | Sieyuan / IEC | Sieyuan Installation & Operation Manual GW4A Rev. 3 §5; IEC 62271-102:2013/A1:2024 Clause 6 |
| ASTA / KEMA-style third-party certificate for GW4A-145/2500-40 not yet issued as of evidence date (2026-09-22) | Sieyuan / ASTA Intertek | Sieyuan Type Test Report GW4A-145/2500-40, 2024 (in-house Power Transmission & Distribution Equipment Test Centre); ASTA Intertek certificate database lookup, evidence date 2026-09-22 |