電氣 - LV switchboard中測試項目
回答 (4)
2009-12-31 4:57 pm
✔ 最佳答案
Ductor Test 圖片參考：http://imgcld.yimg.com/8/n/HA00045281/o/700912300022813873389060.jpg
Ductor Test 是用來量度 contact resistance. 即是contact 同contact 之間接屬的電阻.
例如 Busbar 之間的 joint 位, circuit breaker 關閉後的上下contact
電阻是越少越好. 通常以 micro ohm 作單位.
使用方法好簡單, 好像萬用錶一樣, 兩支針碰在一頭一尾, 然後量度.
http://en.wikipedia.org/wiki/Contact_resistance
http://www.megohmmeterstore.com/crm_uploads/aemc_sd_5600.pdf
Pressure Test
Pressure Test 有分 AC pressure test 和 DC pressure test. 主要是
AC pressure test 主要測試 switchgear (制).
DC pressure test主要測試 cable (電線)
Pressure Test 是注入一個 “50Hz AC” or “DC” 高電壓 (相對地), 維持 1- 5分鐘, 而量度它的 leakage current in (micro Amp). Leakage current 越少越好. 證明 switchgear and cable 能夠抵受 high voltage.以下圖解釋測試方法:
圖片參考：http://imgcld.yimg.com/8/n/HA00045281/o/700912300022813873389072.jpg
PS: Pressure Test 是一個相害性的測試. 通常只會在新裝的裝置使用.
2009-12-31 8:35 pm
如果有埋合格標準就好了!
2009-12-31 4:16 am
任何電力裝置需要測試其目的就係為佐安全操作, 如果未經過測試就可能有危險, 家用電器有規格局測試, 但係工業電器就好難講, 以下就提供部分工業電器既測試, 仲有好多未能一一介紹, 如何測試係要學過既, 並唔能夠三言兩語就可以解析, 或者你購買儀器時供應商會提供測試指南, 除非你自己有讀過有關課程, 你至可以自己製造儀器, 但係有邊個幫你校准呢？
testing and commissioning
The testing and commissioning of high voltage electrical equipment is a highly specialised activity with each and every installation being tested by a trained engineer to exacting standards.
Powersystems testing capability covers an extensive range of disciplines.
Cable installations
1kV and 5kV Insulation tests
DC pressure tests up to 60kV
VLF cable testing up to 80kV
Transformers
HV & LV winding Insulation tests
Winding ratio checks
Bucholz testing
Oil sample and testing (electrical breakdown, acidity, water & PCB content, Disolved gas analysis)
Switchgear
AC pressure testing
Ductor testing
CT’s – Ratio & flick tests, Mag curves
VT’s – Ratio & polarity checks
Functionality checks
Protection testing
Protection
Primary and secondary injection
Timing tests
Overcurrent and earth fault relays
Directional Overcurrent and earth fault relays
Differential transformer protection
Translay and Solkor feeder unit protection
Restricted and standby earth fault relays
Generator loss of mains and G59 protection
Neutral voltage displacement
Transformer auto tapping relays
Intertripping schemes
Earthing
Soil resistivity measurements
Final earth electrode resistance
Underground fault location
Digital pulse echo
testing and commissioning
The testing and commissioning of high voltage electrical equipment is a highly specialised activity with each and every installation being tested by a trained engineer to exacting standards.
Powersystems testing capability covers an extensive range of disciplines.
Cable installations
1kV and 5kV Insulation tests
DC pressure tests up to 60kV
VLF cable testing up to 80kV
Transformers
HV & LV winding Insulation tests
Winding ratio checks
Bucholz testing
Oil sample and testing (electrical breakdown, acidity, water & PCB content, Disolved gas analysis)
Switchgear
AC pressure testing
Ductor testing
CT’s – Ratio & flick tests, Mag curves
VT’s – Ratio & polarity checks
Functionality checks
Protection testing
Protection
Primary and secondary injection
Timing tests
Overcurrent and earth fault relays
Directional Overcurrent and earth fault relays
Differential transformer protection
Translay and Solkor feeder unit protection
Restricted and standby earth fault relays
Generator loss of mains and G59 protection
Neutral voltage displacement
Transformer auto tapping relays
Intertripping schemes
Earthing
Soil resistivity measurements
Final earth electrode resistance
Underground fault location
Digital pulse echo
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