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各位高人,晚辈最近在一个240/120v的项目上遭遇了很严重的电压升高和频率改变,希望得到各位的指点,看这个问题是产生在那里?
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Here is the power from service:
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9 ?, o% I" W1 g7 J2 \> 3 wire 800 splitter feeds 4 120-240 200 A panels system ground plates
4 R5 r- c, O! P y0 [% I# U> bond to splitter main ground lug. Each panel is bonded to main ground. Each
% j) W8 j2 h7 q( @) F5 ]- Q> neutral is bonded to ground. Ballast feeds are 240 with 300 V insulated
8 F `# A2 F( i: ~- A/ t, [- ~> wire. Each 15 A 240 v breaker feeds 2 ballasts rated at 4.05 amps a piece.& U6 @. N* D! N& A- l0 F! D
- @7 C7 {& b8 r& u) TCASE ONE 240V wiring method - use 2 phase wire and 1 ground wire to provide the 240v power to the ballast., n2 h& M! A( P F) M( d7 B* n
Here is his reading from RMS meter in the first day installtion:% M5 t$ U9 y, S" w# H& l0 Q
1, 2 ballast Frenquency 60-61 Phase to Phase Voltage: 240-245
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2, 4 ballast Frenquency 62-64 Phase to Phase Voltage: 250-255: Z% w+ a* s% s6 p* l: w- ?7 \
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3, 6 ballast Frenquency 65-69 Phase to Phase Voltage: 260-265
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: k. b9 f# @/ g* N2 ?4, 8 ballast Frenquency 70-71 Phase to Phase Voltage: 265-275; o1 ~+ X, p* l2 T
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我的问题是,为什么几个整流器就让频率发生了变化?是电子整流器的干扰,谐波还是什么别的原因?
3 T" }7 I. P1 M' h+ R* \在负载增加的时候,电压应该下降才对,怎么能上升呢?
7 f: y' }& i( d$ h在120时,如果负载不平衡,可能导致中线过流,最后导致一定程度的相线电压升高,但240伏的负载怎么可能有这个问题呢?
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多谢各位高人& L1 X, {, z& J8 L4 E
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richard |
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