{"id":609,"date":"2025-09-17T13:38:38","date_gmt":"2025-09-17T05:38:38","guid":{"rendered":"https:\/\/mediumslateblue-chimpanzee-835813.hostingersite.com\/?post_type=product&p=609"},"modified":"2026-04-23T10:59:05","modified_gmt":"2026-04-23T02:59:05","slug":"zero-sequence-current-transformer-2","status":"publish","type":"product","link":"https:\/\/zmgs-global.com\/es\/product\/zero-sequence-current-transformer-2","title":{"rendered":"Transformador de corriente de secuencia cero"},"content":{"rendered":"\t\t
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What Is Zero Sequence Current Transformer\n\uff1f<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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A\u00a0Zero Sequence Current Transformer \u00a0is a type of current transformer used to detect ground faults in electrical power systems. It measures the vector sum of three-phase currents. Under normal balanced conditions, the sum is zero. When a ground fault occurs, the imbalance creates a zero-sequence current, which the ZSCT detects and sends to a protection relay to trip the circuit breaker.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Code And Implication of the Zero Sequence Current Transformer\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Product Parameters<\/h2>\t\t\t\t<\/div>\n\t\t
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Connection terminals and relay symbol<\/th>Relay coil connections<\/th>Scale of relay<\/th>Primary zero-sequence current<\/th>\n<\/tr>\n<\/thead>\n
DD11\/60<\/td>Series connection<\/td>15x1<\/td>2.5-4.5<\/td>\n<\/tr>\n
30x1<\/td>\n<\/tr>\n
Parallel connection<\/td>15x2<\/td>3-5<\/td>\n<\/tr>\n
30x2<\/td>\n<\/tr>\n
DL11\/0.2<\/td>Series connection<\/td>15x1<\/td>3-5<\/td>\n<\/tr>\n
30x1<\/td>\n<\/tr>\n
Parallel connection<\/td>15x2<\/td>3-6<\/td>\n<\/tr>\n
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Outline Dimensions of the Zero Sequence Current Transformer\n<\/h2>\t\t\t\t<\/div>\n\t\t
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LXK<\/th>\n<\/tr>\n<\/thead>\n
Type<\/td>\u00d8D<\/td>\u00d8d<\/td>H<\/td>a<\/td>b<\/td>m<\/td>n<\/td>c<\/td>\n<\/tr>\n
LXK-80<\/td>165<\/td>80<\/td>185<\/td>130<\/td>110<\/td>120<\/td>90<\/td>57<\/td>\n<\/tr>\n
LXK-100<\/td>180<\/td>100<\/td>200<\/td>130<\/td>110<\/td>120<\/td>90<\/td>57<\/td>\n<\/tr>\n
LXK-120<\/td>204<\/td>120<\/td>224<\/td>130<\/td>110<\/td>120<\/td>90<\/td>57<\/td>\n<\/tr>\n
LXK-150<\/td>235<\/td>150<\/td>270<\/td>190<\/td>150<\/td>145<\/td>125<\/td>57<\/td>\n<\/tr>\n
LXK-180<\/td>310<\/td>180<\/td>376<\/td>260<\/td>220<\/td>164<\/td>125<\/td>80<\/td>\n<\/tr>\n
LXK-200<\/td>330<\/td>200<\/td>370<\/td>260<\/td>220<\/td>164<\/td>125<\/td>80<\/td>\n<\/tr>\n
LXK-240<\/td>350<\/td>240<\/td>400<\/td>260<\/td>220<\/td>164<\/td>125<\/td>80<\/td>\n<\/tr>\n
LXK<\/td>\n<\/tr>\n
LXK-80<\/td>85<\/td>170<\/td>63<\/td>132*122<\/td>110x100<\/td>195<\/td><\/td>\n<\/tr>\n
LXK-100<\/td>105<\/td>190<\/td>65<\/td>132*125<\/td>110x100<\/td>208<\/td>\n<\/tr>\n
LXK-120<\/td>125<\/td>212<\/td>65<\/td>132*127<\/td>110x100<\/td>230<\/td>\n<\/tr>\n
LXK-120(50\/5)<\/td>125<\/td>215<\/td>67<\/td>132*130<\/td>110x105<\/td>230<\/td>\n<\/tr>\n
LXK-140<\/td>145<\/td>240<\/td>65<\/td>200*133<\/td>150x100<\/td>270<\/td>\n<\/tr>\n
LXK-150<\/td>155<\/td>243<\/td>65<\/td>200*133<\/td>150x100<\/td>275<\/td>\n<\/tr>\n
LXK-160<\/td>165<\/td>268<\/td>65<\/td>200*133<\/td>150x100<\/td>290<\/td>\n<\/tr>\n
LXK-180<\/td>185<\/td>302<\/td>67<\/td>280*155<\/td>220x115<\/td>356<\/td>\n<\/tr>\n
LXK-200<\/td>205<\/td>326<\/td>69<\/td>280*155<\/td>220x120<\/td>382<\/td>\n<\/tr>\n
LXK-220<\/td>225<\/td>346<\/td>69<\/td>280*155<\/td>220x120<\/td>402<\/td>\n<\/tr>\n
LXK-240<\/td>245<\/td>386<\/td>80<\/td>280*167<\/td>220x120<\/td>438<\/td>\n<\/tr>\n
LXK-260<\/td>265<\/td>406<\/td>80<\/td>280*167<\/td>220x130<\/td>458<\/td>\n<\/tr>\n
LXK-300<\/td>305<\/td>465<\/td>80<\/td>280*167<\/td>220x130<\/td>523<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Why Choose ZHIMING's Zero Sequence Current Transformer\n?<\/h2>\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tHigh Sensitivity to Ground Faults\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\tA zero sequence transformer detects even small ground fault currents, enabling fast protection response and reducing equipment damage.\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tSimple Installation and Compact Design\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\tUnlike three separate CTs, a single zero sequence transformer encircles all three phase conductors, saving space and simplifying wiring.\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\tBecause it measures only the unbalanced (zero sequence) current, it inherently rejects load current and harmonic imbalances, providing reliable fault detection.\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\tUsing one zero sequence transformer is cheaper than three standard CTs plus a summation device, making it ideal for low and medium voltage systems.\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tCompatibility with Residual Current Relays\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\tZero sequence transformers work seamlessly with modern protection relays (e.g., 51N\/50N), allowing easy integration into existing power distribution networks.\n\n\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What is the difference between a zero sequence transformer and a normal CT? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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A normal current transformer measures current in a single conductor. A zero sequence transformer measures the vector sum of three-phase currents simultaneously. Under normal conditions, the sum is zero; during a ground fault, the imbalance produces an output proportional to the fault current.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Do I need a zero sequence transformer for a solidly grounded system? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Yes. Even in solidly grounded systems, a zero sequence transformer provides sensitive ground fault detection, especially for low-magnitude faults that may not trip overcurrent relays quickly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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How do I select the correct zero sequence transformer? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Key parameters: rated voltage, cable diameter (window size), primary fault current setting, and output rating (e.g., 1A or 5A secondary). Always match the transformer\u2019s class and burden to your protection relay.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Can a zero sequence transformer detect high-impedance ground faults? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Yes, if it is designed with high sensitivity (e.g., core balance types with low ratio errors). However, very high-impedance faults may require special toroidal CTs with nanomagnetic cores.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Where is a zero sequence transformer typically installed? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Common locations: incoming mains of low voltage switchboards, feeders to motors or transformers, generator neutrals, and unearthed or resistance-grounded systems. It is placed around all three phases (and neutral, if applicable).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Guides You Might Need<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\"Capacitor<\/div>\n\t\t<\/a>\n\t\t\t\t
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\n\t\t\t\n\t\t\t\tWhat are the advantages of automatic power factor controller?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t
\n\t\t\t\t\t\n\t\t\t04\/28\/2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\n\t\t\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t
\n\t\t\t\t\n\t\t\t
\"DGFC<\/div>\n\t\t<\/a>\n\t\t\t\t
\n\t\t\t\t

\n\t\t\t\n\t\t\t\tWhat is the purpose of the power factor controller?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t
\n\t\t\t\t\t\n\t\t\t04\/28\/2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\n\t\t\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t
\n\t\t\t\t\n\t\t\t
\"APF\"<\/div>\n\t\t<\/a>\n\t\t\t\t
\n\t\t\t\t

\n\t\t\t\n\t\t\t\tHow Does the Automatic Power Factor Controller Work?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t
\n\t\t\t\t\t\n\t\t\t04\/28\/2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\n\t\t\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t
<\/div>\n\t\t\t\t