Lecture 2 PDF

10 / 1 4 / 2 0 2 4 56 SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS 56 SWITCHGEAR & PROTECTION SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS...

10 / 1 4 / 2 0 2 4 56 SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS 56 SWITCHGEAR & PROTECTION SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS 57 1 57  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS 58 58 SWITCHGEAR & PROTECTION SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS 59 2 59  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: INTRODUCTION TO CIRCUIT BREAKERS 60 60 61 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 3 61  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 62 OVERVIEW 62 SWITCHGEAR & PROTECTION SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 63 OVERVIEW 4 63  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 64 OVERVIEW 64 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 65 OVERVIEW MINITURE CIRCUIT RESIDUAL CIRCUIT PANEL BOARD BREAKER BREAKER CONSUMER UNIT 5 65  10 / 1 4 / 2 0 2 4 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 66 OVERVIEW RESIDUAL CURRENT CIRCUIT BREAKER(RCCB) 66 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 67 OVERVIEW RESIDUAL CURRENT CIRCUIT BREAKER WITH OVERCURRENRT PROTECTION 6 67  10 / 1 4 / 2 0 2 4 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 68 OVERVIEW MOLDED CASE CIRCUIT BREAKER MCCB 68 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 69 OVERVIEW ACB:AIR CIRCUIT BREAKR (Higher Current Level) 7 69  10 / 1 4 / 2 0 2 4 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 70 OVERVIEW AIR CIRCUIT BREAKER IN SWITCHGEAR 70 SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS DECREASING BREAKING CAPACITY 71 OVERVIEW The hierarchy is clearly illustrated by the following SLD: 8 71  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 72 OVERVIEW 72 SWITCHGEAR & PROTECTION SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 73 OVERVIEW 9 73  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: LOW VOLTAGE CIRCUIT BREAKERS 74 OVERVIEW 74 SWITCHGEAR 75 OUTLINE MINIATURE CIRCUIT BREAKER (MCB) MOLDED CASE CIRCUIT BREAKER (MCCB) AIR CIRCUIT BREAKER (ACB) 10 RESIDUAL CURRENT CIRCUIT BREAKER(RCD) 75  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 76 76 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 77 11 77  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 78 78 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 79 12 79  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 80 Basic idea of thermal trip: 80 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 81 Basic idea of thermal trip: 13 81  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 82 82 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 83 Magnetic protection concept of MCB: 14 83  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 84 84 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 85 MCB Time Current Characteristics: 15 85  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 86 86 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 87 Common MCB current ratings and short circuit capacity: 16 87  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 88 88 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 89 17 89  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 90 90 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 91 Starting current 18 Compressor off 91  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 92 92 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 93 19 93  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 94 94 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 95 20 95  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 96 96 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 97 21 97  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 98 98 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 99 22 99  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MINIATURE CIRCUIT BREAKER (MCB) 100 100 SWITCHGEAR 101 OUTLINE MINIATURE CIRCUIT BREAKER (MCB) MOLDED CASE CIRCUIT BREAKER (MCCB) AIR CIRCUIT BREAKER (ACB) 23 RESIDUAL CURRENT CIRCUIT BREAKER(RCD) 101  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 102 102 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 103 24 103  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 104 104 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 105 25 105  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 106 106 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 107 26 107  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 108 108 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 109 27 109  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 110 110 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 111 FIXED THERMAL, FIXED MAGNETIC ADJUSTABLE THERMAL, FIXED MAGNETIC FIXED THERMAL, ADJUSTABLE MAGNETIC ADJUSTABLE THERMAL, ADJUSTABLE MAGNETIC 28 111  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: MOLDED CASE CIRCUIT BREAKER (MCCB) 112 112 SWITCHGEAR 113 OUTLINE MINIATURE CIRCUIT BREAKER (MCB) MOLDED CASE CIRCUIT BREAKER (MCCB) AIR CIRCUIT BREAKER (ACB) 29 RESIDUAL CURRENT CIRCUIT BREAKER(RCD) 113  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: AIR CIRCUIT BREAKER (ACB) 114 114 SWITCHGEAR & PROTECTION SWITCHGEAR: AIR CIRCUIT BREAKER (ACB) 115 30 115  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: AIR CIRCUIT BREAKER (ACB) 116 116 SWITCHGEAR & PROTECTION SWITCHGEAR: AIR CIRCUIT BREAKER (ACB) 117 31 117  10 / 1 4 / 2 0 2 4 SWITCHGEAR 118 OUTLINE MINIATURE CIRCUIT BREAKER (MCB) MOLDED CASE CIRCUIT BREAKER (MCCB) AIR CIRCUIT BREAKER (ACB) RESIDUAL CURRENT CIRCUIT BREAKER(RCD) 118 SWITCHGEAR & PROTECTION SWITCHGEAR: AIR CIRCUIT BREAKER (ACB) 119 32 119  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: RESIDUAL CURRENT DEVICE (RCD) 120 I 60 mA I 60 mA 120 SWITCHGEAR & PROTECTION SWITCHGEAR: RESIDUAL CURRENT DEVICE (RCD) 121 AT AT SENSING SENSING COIL COIL F1=F F1≠F22 I1≠I2 I1=I2 ∴∴ F1 𝐹𝐹 = ≠ 00 I1 I1 33 ∴∴ RELAY RELAY DON’T TRIP TRIP I2 F2 I2 121  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: RESIDUAL CURRENT DEVICE (RCD) 122 122 SWITCHGEAR & PROTECTION SWITCHGEAR: RESIDUAL CURRENT DEVICE (RCD) 123 34 123  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: RESIDUAL CURRENT DEVICE (RCD) 124 124 125 SWITCHGEAR: HIGH VOLTAGE CIRCUIT BREAKERS 35 125  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: HIGH VOLTAGE CIRCUIT BREAKERS, 126 OVERVIEW. 126 SWITCHGEAR & PROTECTION SWITCHGEAR: HIGH VOLTAGE CIRCUIT BREAKERS, 127 OVERVIEW. 36 127  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: HIGH VOLTAGE CIRCUIT BREAKERS, 128 OVERVIEW. 128 SWITCHGEAR & PROTECTION SWITCHGEAR: HIGH VOLTAGE CIRCUIT BREAKERS, 129 OVERVIEW. 37 129  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: HIGH VOLTAGE CIRCUIT BREAKERS, 130 OVERVIEW. General classification of high voltage CBs: 130 SWITCHGEAR & PROTECTION SWITCHGEAR: TYPES OF HIGH VOLTAGE CIRCUIT 131 BREAKERS. 38 131  10 / 1 4 / 2 0 2 4 SWITCHGEAR & PROTECTION SWITCHGEAR: TYPES OF HIGH VOLTAGE CIRCUIT 132 BREAKERS. 132 SWITCHGEAR & PROTECTION SWITCHGEAR: TYPES OF HIGH VOLTAGE CIRCUIT 133 BREAKERS. Present trends in choice of CBs: 39 133