VR2R-0502
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Rack Level Infrastructure: Power Delivery - Line hint:
414
Context Before
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
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).
Context After
Below we provide two possible scenarios of the power rack deployment for VR NVL72.
② Atomic Claim
對 hyperscale customers 而言，他們可能選擇部署 standalone power rack，採 LVDC 或 HVDC。
- Epistemic Mode:
HYPOTHETICAL - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "NARY_RELATION",
"participants": [
{
"node": {
"id": "04_knowledge_base/Hyperscaler",
"label": "hyperscaler"
},
"role": "customer_type"
},
{
"node": {
"id": "04_knowledge_base/High-voltage direct current (HVDC)",
"label": "HVDC"
},
"role": "power_architecture"
}
],
"qualifiers": {
"condition_text": "hypothetical; LVDC and standalone power rack are plain text",
"numeric_mentions": [],
"temporal_mentions": []
},
"relation_type": "HYPERSCALER_STANDALONE_POWER_RACK_OPTIONS"
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| customer_type | hyperscaler | Hyperscaler |
| power_architecture | HVDC | 04_knowledge_base/High-voltage direct current (HVDC) |
⑤ 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。