Electricity supply questions

1. What is the maximum kVA for a cut-out?

2. What is the kVA for a typical transformer used in a building?

Please provide CLP and HKE data separately.

Thank you.

以中電為例,各種常用的變壓器之額定功率如下:
11KV > 380/220V (郷村用,木柱支架) --- 200KVA
11KV > 380/220V (住宅及輕工業,地盤等) --- 1.6MVA
132KV > 33KV 、 33KV > 11KV --- 35~50MVA
400KV > 132KV --- 240MVA

* 只有 200KVA 熔斷器在低壓側 (400A X 3)

由於受到本港電力工程人員牌照的管制
即俗稱 A 牌和 B 牌,兩者可作業的電流容量
分別是 400 及 2500 安培,故上列的 380/220V
供電規格適用於本港兩間電力公司.

如是住宅樓宇,會以一戶 5~10KVA 計算
(以面積,樓宇類別而言)以 1.6MVA 的倍數
來決定變壓器的數目,而目前住宅用戶電錶
的極限電流值是 80 安培,錶前過荷掣在 50~80 安培,
舊式錶前熔斷器常是 100 安培.

[ Last edited by kitarolo on 2005-10-24 at 21:43 ]

以中電為例,各種常用的變壓器之額定功率如下:
11KV > 380/220V (郷村用,木柱支架) --- 200KVA
Is it installed in a transformer room in a private development or in a purposely built CLP Substation?

11KV > 380/220V (住宅及輕工業,地盤等) --- 1.6MVA
Are these the ones we use in existing buildings? But I see many of them write 1500kVA and not 1600.
132KV > 33KV 、 33KV > 11KV --- 35~50MVA
For MTR?
400KV > 132KV --- 240MVA
For sub-stations?

* 只有 200KVA 熔斷器在低壓側 (400A X 3)

由於受到本港電力工程人員牌照的管制
即俗稱 A 牌和 B 牌,兩者可作業的電流容量
分別是 400 及 2400 安培,故上列的 380/220V
供電規格適用於本港兩間電力公司.

How about those with Grade C license? Do they all work for power companies? I don't think so. So what else do they do?

如是住宅樓宇,會以一戶 5~10KVA 計算
(以面積,樓宇類別而言)以 1.6MVA 的倍數
來決定變壓器的數目,而目前住宅用戶電錶
的極限電流值是 80 安培,錶前過荷掣在 50~80 安培,
舊式錶前熔斷器常是 100 安培.

What are 錶前過荷掣 and 錶前熔斷器 in English? What are their differences?

I think we would better discuss with English.

[ref=402110]abh[/ref]  在 2005-10-24 19:41 發表:
11KV > 380/220V (200KVA) ... Is it installed in a transformer room
in a private development or in a purposely built CLP Substation?

It is still used at outlying Islands and remote rural area.
It is outdoor, oil-filled type, pls see the attached diagram.

11KV > 380/220V (1.6MVA) ... Are these the ones we use in existing
buildings? But I see many of them write 1500kVA and not 1600.

In fact some old devices have a safety margin.
Newly plants are 1600 KVA rating.

132KV > 33KV 、 33KV > 11KV --- 35~50MVA  For MTR?
400KV > 132KV --- 240MVA  For sub-stations?

Most of above only use in regional sub-stations.
For MTR system pls refer
http://railway.zonasa.com/chi/power.html

How about those with Grade C license?
Do they all work for power companies?
I don't think so. So what else do they do?

Linense C requires for holding Linense B at least 6 years.
Exam with paperwork but no practical parts, most of them
work in the contractor of electric companies.
*The permissible rate should be 2500A for Lincese B workers.

What are 錶前過荷掣 and 錶前熔斷器 in English?
What are their differences?

MCCB & Fuse respectively, installed BEFORE the kilowatt-hour meter.