VR-COV-VR-BUSBAR-CURRENT
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Rack Level Infrastructure: Power Delivery - Line hint:
611
Context Before
Source: Nvidia VR NVL72 Component BoM and Power Budget Model ↗
For the VR NVL72 reference design, the power delivery infrastructure at the rack level includes four 110kW power shelves. The VR NVL72 system has a TDP up to 220kW for the 2300W Rubin TDP SKU. The design with four 110kW power shelves is an N+1 redundancy approach. Each 110kW power shelf is 3U tall and includes six 18.3kW PSU with built in capacitors in the PSU. Each power shelf receives three phase 415VAC-480VAC of power from two 100A whips. The power shelves step down the power from 415VAC-480VAC to 50VDC and sends it to the busbar. Interestingly, the busbar of VR NVL72 is rated for 5000A+, which is much higher than that of Grace Blackwell at 2900A. Given the extremely high current and the lack of fans in the rack, the busbar has to be liquid cooled.
Evidence
Context After
Source: TE Connectivity, OCP 2025
For the hyperscale customers, they might choose to deploy a standalone power rack either in LVDC (low voltage direct current) or HVDC (high voltage direct current). Below we provide two possible scenarios of the power rack deployment for VR NVL72.
② Atomic Claim
The cited OCP 2025 busbar comparison rates the liquid-cooled ORv3 HPR example at 15,625A.
- Epistemic Mode:
ATTRIBUTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"attribute": "ORV3_HPR_LIQUID_COOLED_EXAMPLE_CURRENT",
"context_nodes": [],
"entity": {
"id": "04_knowledge_base/Busbar",
"label": "Busbar"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [],
"value_text": "15,625A"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | Busbar | Busbar |
⑤ V2 Draft（需要修正時直接編輯）
Inline repair
只編輯以下三個 Draft 區塊。完成後將
review_action設為REQUEST_REPAIR，再手動執行 Repair Preview。
執行腳本前，Draft 不會寫入 Claim Store 或 Graph。
V2 Atomic Claim Draft
The cited OCP 2025 busbar comparison rates the liquid-cooled ORv3 HPR example at 15,625A.
V2 Semantic Frame Draft
{
"attribute": "ORV3_HPR_LIQUID_COOLED_EXAMPLE_CURRENT",
"context_nodes": [],
"entity": {
"id": "04_knowledge_base/Busbar",
"label": "Busbar"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [],
"value_text": "15,625A"
}
}V2 Revision Metadata Draft
{
"epistemic_mode": "ATTRIBUTED",
"mapping_status": "COMPLETE"
}⑥ Human Review
請在 Properties 逐項確認：
- 原文 → Atomic Claim 是否忠實
- Atomic Claim → Semantic Frame 是否忠實
- Canonical Entity mapping 是否正確
- Epistemic mode 是否保留原文語氣
- 最後選擇
review_action
Review state
Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。