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解説
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解説
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解説
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(1) 54 (2) 86 (3) 124 (4) 152 (5) 256
解説
æ£è§£ã¯(a)ã(4)ã(b)ã(2)ã§ãã (a) äžæ§ç¹éæ¥å°æ¹åŒã®äžçž3ç·åŒé»è·¯ã«ãããŠãäžç·å°çµ¡æã®å°çµ¡é»æµ $I_g$ ã¯ãå šç³»çµ±ã®å¯Ÿå°éé»å®¹é $C_0 = C_1 + C_2$ ãéããŠæµããŸããçžé»å§ã $E = \frac{V}{\sqrt{3}}$ ãšãããšãå°çµ¡é»æµã®å€§ããã¯æ¬¡ã®ããã«æ±ããããŸãã $$I_g = 3\omega C_0 E = 3(2\pi f)(C_1 + C_2)\frac{V}{\sqrt{3}} = \sqrt{3} \times 2\pi f(C_1 + C_2)V = 2\sqrt{3}V\pi f(C_1 + C_2)$$ ãããã£ãŠã(4)ãæ£ããåŒãšãªããŸãã (b) äºæ ç¹ããéèŠèšåæ§å€ïŒé é»ç·åŽïŒãã«ããå ŽåãéèŠèšåã®é¶çžå€æµåšïŒZCTïŒã§æ€åºããã黿µ $I_0$ ã¯ãéèŠèšåèªèº«ã®å¯Ÿå°éé»å®¹é $C_2$ ãéããŠæµããå é»é»æµã®åèšãšãªããŸãã $$I_0 = 3\omega C_2 E = \sqrt{3} \omega C_2 V = 2\sqrt{3}V\pi f C_2$$ æ°å€ãä»£å ¥ããŸãã $$I_0 = 2 \times \sqrt{3} \times \pi \times 60 \times 0.02 \times 10^{-6} \times 6600$$ $$I_0 \approx 0.08618 \text{ [A]} = 86.18 \text{ [mA]}$$ æãè¿ãå€ã¯(2)ã®86ã§ãã https://denken.joho.info/hoki/keisan-b-d-earth/
ãå12ãé²çžã³ã³ãã³ãµèšåã®ç«¯åé»å§ãšå®¹é
äžçž3 ç·åŒã®é«å§é»è·¯ã«300 kWïŒé
ãåç0.6 ã®äžçžè² è·ãæ¥ç¶ãããŠããããã®è² è·ãšäžŠåã«é²çžã³ã³ãã³ãµèšåãæ¥ç¶ããŠåçæ¹åãè¡ããã®ãšãããé²çžã³ã³ãã³ãµèšåã¯å³ã«ç€ºãããã«çŽåãªã¢ã¯ãã«ä»äžçžã³ã³ãã³ãµãšãïŒçŽåãªã¢ã¯ãã«SR ã®ãªã¢ã¯ã¿ã³ã¹ $X_L$ [Ω]ã¯ïŒäžçžã³ã³ãã³ãµSC ã®ãªã¢ã¯ã¿ã³ã¹ $X_C$ [Ω]ã®6 ïŒ
ãšãããšãïŒæ¬¡ã®(a)åã³(b)ã®åã«çããã
ãã ãïŒé«å§é»è·¯ã®ç·éé»å§ã¯6 600 V ãšãïŒç¡å¹é»åã«ãã£ãŠé»å§ã¯å€åããªããã®ãšããã
(a) é²çžã³ã³ãã³ãµèšåãé«å§é»è·¯ã«æ¥ç¶ãããšãã«äžçžã³ã³ãã³ãµ SCã®ç«¯åé»å§ã®å€ [V]ãšããŠãæãè¿ããã®ã次ã®(1)ãã(5)ã®ãã¡ããäžã€éžã¹ã
(1) 6410 (2) 6 795 (3) 6807 (4) 6995 (5) 7021
(b) é²çžã³ã³ãã³ãµèšåãè² è·ãšäžŠåã«æ¥ç¶ããåçãé
ã 0.6 ããé
ã 0.8 ã«æ¹åããããã®ãšãããã®èšåã®äžçžã³ã³ãã³ãµ SCã®å®¹éã®å€ [kvar] ãšããŠãæãè¿ããã®ã次ã®(1)ãã(5)ã®ãã¡ããäžã€éžã¹ã
(1) 170 (2) 180 (3) 186 (4) 192 (5) 208
解説
æ£è§£ã¯(a)ã(5)ã(b)ã(3)ã§ãã (a) ã³ã³ãã³ãµã®ãªã¢ã¯ã¿ã³ã¹ã $X_C$ãçŽåãªã¢ã¯ãã«ã®ãªã¢ã¯ã¿ã³ã¹ã $X_L$ ãšããŸããçŽåãªã¢ã¯ãã«ãã³ã³ãã³ãµã® $6\%$ ã§ãããšãã $X_L = 0.06 X_C$ ãšãªããŸããã³ã³ãã³ãµã®ç«¯åé»å§ $V_C$ ã¯ãåè·¯é»å§ $V$ ã«å¯ŸããŠæ¬¡ã®ããã«è¡šãããŸãã $$V_C = \frac{X_C}{X_C – X_L} \times V = \frac{X_C}{X_C – 0.06 X_C} \times V = \frac{1}{0.94} \times 6 600 \approx 7021.3 \text{ [V]}$$ ãããã£ãŠãæãè¿ãå€ã¯(5)ã®7021ãšãªããŸãã (b) ãŸããåçæ¹åã«å¿ èŠãªç¡å¹é»åïŒèšåå šäœã®å®¹éïŒ $\Delta Q$ ãæ±ããŸãã è² è·ã®æå¹é»å $P = 300 \text{ [kW]}$ãæ¹ååã®åçè§ã $\theta_1$ãæ¹ååŸã®åçè§ã $\theta_2$ ãšãããšã $$\Delta Q = P (\tan \theta_1 – \tan \theta_2) = 300 \times \left( \frac{0.8}{0.6} – \frac{0.6}{0.8} \right) = 300 \times (1.333 – 0.75) = 175 \text{ [kvar]}$$ 次ã«ãäžçžã³ã³ãã³ãµ SC åäœã®å®¹é $Q_C$ ïŒç«¯åé»å§ $V_C$ ã«ãããå®å¹åºåïŒãæ±ããŸããé²çžã³ã³ãã³ãµèšåå šäœã®å®¹é $\Delta Q$ ãšã®é¢ä¿ã¯ã $\Delta Q = Q_C (1 – 0.06)$ ãšãªãããã $$Q_C = \frac{\Delta Q}{1 – 0.06} = \frac{175}{0.94} \approx 186.2 \text{ [kvar]}$$ ãããã£ãŠãæãè¿ãå€ã¯(3)ã®186ãšãªããŸãã https://denken.joho.info/hoki/denki-shisetsu-kanri/
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解説
æ£è§£ã¯(5)ã§ãã â 黿°äºæ¥æ³ 第39æ¡ç¬¬2é 第3å·ããã(ã¢)ã«ã¯ãäžè¬éé é»äºæ¥ããå ¥ããŸãã â¡ é»æ°é¢ä¿å ±åèŠå 第3æ¡ç¬¬1é 第4å·ïŒäŸçµŠæ¯éäºæ ïŒã®èŠå®ã«ãããŸããå ±å察象ãšãªãã®ã¯ã(ã€)èªå®¶çšé»æ°å·¥äœç©ãèšçœ®ããè ãã(ã¢)äžè¬éé é»äºæ¥è ã®é»è·¯ãšæ¥ç¶ãããŠããé»å§(ãŠ)3000V以äžã®å·¥äœç©ã®ç Žæçã«ããã(ã¢)è ã«äŸçµŠæ¯éãçºçãããå Žåã§ãã ⢠éèŠå®¶æ§å ã§ã®äºæ ãåå ã§é é»ç³»çµ±å šäœã«åœ±é¿ïŒæ³¢åäºæ ïŒãåãŒããå Žåãå ±åã®å¯Ÿè±¡ãšãªãäºæ ç¹ã¯ãéèŠå®¶åŽã®èšåã§ãã(ãš)ãäºæ ç¹1ãïŒäŸïŒåé»çšé®æåšãã±ãŒãã«ãªã©ïŒãšãªããŸãã ãããããã¹ãŠæºããçµåãã¯(5)ã§ãã https://denken.joho.info/hoki/denkijigyoho-106-denkikankeihoukokukisoku-3-jikohokoku/
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https://denken.joho.info/denken3-hoki/ https://denken.joho.info/denken3/


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