{"id":935,"date":"2026-08-27T06:21:29","date_gmt":"2026-08-27T06:21:29","guid":{"rendered":"https:\/\/demos2us.in\/electric\/?post_type=product&#038;p=935"},"modified":"2026-08-31T10:20:14","modified_gmt":"2026-08-31T10:20:14","slug":"grounding-transformer-earthing-transformer-zigzag-transformer-2","status":"publish","type":"product","link":"https:\/\/demos2us.in\/electric\/products\/grounding-transformer-earthing-transformer-zigzag-transformer-2\/","title":{"rendered":"Grounding transformer &#038; Earthing transformer &#038; Zigzag transformer"},"content":{"rendered":"<p>The purpose of a grounding transformer bank or three-phase grounding transformer is to ground the neutral of an otherwise isolated-neutral system.<\/p>\n<p>The most common configurations are wye-delta and interconnected-star or zig-zag.<\/p>\n<p>If the system voltage is symmetrical, the line-to-neutral voltages are balanced, and the grounding transformer takes just sufficient current to excite it.<\/p>\n<p>If there is a fault or an unbalanced load in the system, the line-to-neutral voltages are no longer balanced, and co-phasal currents, of the same magnitude, may flow in the transformer phases. These currents are the zero-sequence components. In the zig-zag connection, the zero-sequence currents produce no net magnetization of the iron core, because they flow in opposite directions in each leg and only see the low leakage impedance of the coils.<\/p>\n<p>The grounding transformers offer a much smaller impedance to zero-sequence currents than to the exciting currents in a balanced system, providing a low impedance route to ground and keeping the neutral at ground potential.<\/p>\n<p>Under a line-to-ground fault, the grounding transformers will allow let a suitably large fault current to activate the protection schemes. Grounding transformers also allow the flow of triple-harmonics to equalize the voltages in some transformer connections.<\/p>\n","protected":false},"featured_media":936,"template":"","product_category":[7,8],"class_list":["post-935","product","type-product","status-publish","has-post-thumbnail","hentry","product_category-power-resistors","product_category-neutral-grounding-resistor"],"acf":[],"_links":{"self":[{"href":"https:\/\/demos2us.in\/electric\/wp-json\/wp\/v2\/product\/935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/demos2us.in\/electric\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/demos2us.in\/electric\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/demos2us.in\/electric\/wp-json\/wp\/v2\/media\/936"}],"wp:attachment":[{"href":"https:\/\/demos2us.in\/electric\/wp-json\/wp\/v2\/media?parent=935"}],"wp:term":[{"taxonomy":"product_category","embeddable":true,"href":"https:\/\/demos2us.in\/electric\/wp-json\/wp\/v2\/product_category?post=935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}