{"id":4738,"date":"2024-07-18T09:27:01","date_gmt":"2024-07-18T15:27:01","guid":{"rendered":"https:\/\/www.dreiym.com\/?p=4738"},"modified":"2025-01-17T18:10:04","modified_gmt":"2025-01-18T00:10:04","slug":"uzemnovaci-elektrody-a-systemy-uzemneni-jak-je-testovat-a-proc-je-to-dulezite","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/2024\/07\/18\/uzemnovaci-elektrody-a-systemy-uzemneni-jak-je-testovat-a-proc-je-to-dulezite\/","title":{"rendered":"Uzem\u0148ovac\u00ed elektrody a syst\u00e9my uzemn\u011bn\u00ed: Jak je testovat a pro\u010d na tom z\u00e1le\u017e\u00ed?"},"content":{"rendered":"

Uzem\u0148ovac\u00ed elektrody a syst\u00e9my uzemn\u011bn\u00ed jsou z\u00e1kladn\u00edmi sou\u010d\u00e1stmi elektrick\u00fdch instalac\u00ed, kter\u00e9 zaji\u0161\u0165uj\u00ed bezpe\u010dnost a ochranu osob a za\u0159\u00edzen\u00ed. Uzem\u0148ovac\u00ed elektrody jsou vodiv\u00e9 ty\u010de nebo desky, kter\u00e9 jsou zakopan\u00e9 v zemi a p\u0159ipojen\u00e9 k elektrick\u00e9mu syst\u00e9mu. Poskytuj\u00ed n\u00edzkoodporovou cestu, po kter\u00e9 proudy p\u0159i poru\u0161e te\u010dou do zem\u011b, a zabra\u0148uj\u00ed vzniku nebezpe\u010dn\u00e9ho nap\u011bt\u00ed v syst\u00e9mu. Syst\u00e9my uzemn\u011bn\u00ed jsou vodiv\u00e9 dr\u00e1ty nebo ty\u010de, kter\u00e9 spojuj\u00ed uzem\u0148ovac\u00ed elektrody se za\u0159\u00edzen\u00edmi a sk\u0159\u00edn\u011bmi, kter\u00e9 je t\u0159eba uzemnit. Zaji\u0161\u0165uj\u00ed, \u017ee v\u0161echny uzemn\u011bn\u00e9 \u010d\u00e1sti maj\u00ed stejn\u00fd potenci\u00e1l, a sni\u017euj\u00ed riziko vzniku \u00faraz elektrick\u00fdm proudem a po\u017e\u00e1r<\/a>. Syst\u00e9my jsou sice velmi jednoduch\u00e9, ale terminologie m\u016f\u017ee b\u00fdt pro n\u011bkoho obt\u00ed\u017en\u011b zvl\u00e1dnuteln\u00e1. \u00dapln\u011bj\u0161\u00ed v\u00fdklad lze z\u00edskat v kapitole 250 N\u00e1rodn\u00edho elektrotechnick\u00e9ho p\u0159edpisu (NEC).<\/p>\n\n\n\n

Testov\u00e1n\u00ed vzd\u00e1len\u00e9ho zemn\u00edho odporu zemni\u010de<\/h2>\n\n\n\n

Jedn\u00edm z nejd\u016fle\u017eit\u011bj\u0161\u00edch parametr\u016f zemni\u010de je jeho vzd\u00e1len\u00fd zemn\u00ed odpor, co\u017e je odpor mezi elektrodou a bodem v zemi, kter\u00fd je od n\u00ed vzd\u00e1len. \u010c\u00edm ni\u017e\u0161\u00ed je vzd\u00e1len\u00fd zemn\u00ed odpor, t\u00edm l\u00e9pe dok\u00e1\u017ee uzem\u0148ovac\u00ed elektroda odv\u00e1d\u011bt poruchov\u00e9 proudy a zabra\u0148ovat p\u0159ep\u011bt\u00ed. Vzd\u00e1len\u00fd zemn\u00ed odpor z\u00e1vis\u00ed na n\u011bkolika faktorech, jako je odpor p\u016fdy, hloubka a d\u00e9lka elektrody, vlhkost a teplota p\u016fdy a p\u0159\u00edtomnost dal\u0161\u00edch bl\u00edzk\u00fdch elektrod nebo vodi\u010d\u016f.<\/p>\n\n\n\n

Pro m\u011b\u0159en\u00ed vzd\u00e1len\u00e9ho zemn\u00edho odporu uzem\u0148ovac\u00ed elektrody je b\u011b\u017en\u00fd je metoda poklesu potenci\u00e1lu<\/a> metoda, kter\u00e1 vyu\u017e\u00edv\u00e1 zku\u0161ebn\u00ed p\u0159\u00edstroj, proudovou sondu a dv\u011b pomocn\u00e9 elektrody. Zku\u0161ebn\u00ed p\u0159\u00edstroj pou\u0161t\u00ed do uzem\u0148ovac\u00ed elektrody a proudov\u00e9 sondy zn\u00e1m\u00fd proud a m\u011b\u0159\u00ed \u00fabytek nap\u011bt\u00ed na uzem\u0148ovac\u00ed elektrod\u011b a jedn\u00e9 z pomocn\u00fdch elektrod. Vzd\u00e1len\u00fd zemn\u00ed odpor se vypo\u010d\u00edt\u00e1 vyd\u011blen\u00edm \u00fabytku nap\u011bt\u00ed vst\u0159ikovan\u00fdm proudem. Na druh\u00e9 pomocn\u00e9 elektrod\u011b se ov\u011b\u0159\u00ed, \u017ee nam\u011b\u0159en\u00fd \u00fabytek nap\u011bt\u00ed nez\u00e1vis\u00ed na jej\u00ed poloze, co\u017e znamen\u00e1, \u017ee vzd\u00e1len\u00fd zemn\u00ed odpor je p\u0159esn\u00fd.<\/p>\n\n\n\n

Testov\u00e1n\u00ed st\u0159\u00eddav\u00e9 impedance syst\u00e9mu uzemn\u011bn\u00ed<\/h2>\n\n\n\n

Dal\u0161\u00edm d\u016fle\u017eit\u00fdm parametrem uzem\u0148ovac\u00edho syst\u00e9mu je jeho st\u0159\u00eddav\u00e1 impedance, co\u017e je odpor proti toku st\u0159\u00eddav\u00e9ho proudu v syst\u00e9mu. \u010c\u00edm ni\u017e\u0161\u00ed je impedance st\u0159\u00eddav\u00e9ho proudu, t\u00edm l\u00e9pe dok\u00e1\u017ee syst\u00e9m zemn\u00edho pospojov\u00e1n\u00ed vyrovnat potenci\u00e1ly uzemn\u011bn\u00fdch \u010d\u00e1st\u00ed a sn\u00ed\u017eit \u0161um a ru\u0161en\u00ed v syst\u00e9mu. St\u0159\u00eddav\u00e1 impedance z\u00e1vis\u00ed na n\u011bkolika faktorech, jako je odpor, induk\u010dnost a kapacita vodi\u010d\u016f zemn\u00edho pospojov\u00e1n\u00ed, frekvence proudu a konfigurace a uspo\u0159\u00e1d\u00e1n\u00ed syst\u00e9mu.<\/p>\n\n\n\n

Pro m\u011b\u0159en\u00ed st\u0159\u00eddav\u00e9 impedance syst\u00e9mu uzemn\u011bn\u00ed je b\u011b\u017enou metodou metoda kle\u0161\u0165ov\u00e1, kter\u00e1 pou\u017e\u00edv\u00e1 zku\u0161ebn\u00ed p\u0159\u00edstroj s proudov\u00fdm transform\u00e1torem s d\u011blen\u00fdm j\u00e1drem. Zku\u0161ebn\u00ed p\u0159\u00edstroj se upne kolem vodi\u010de zemn\u00edho pospojov\u00e1n\u00ed a pust\u00ed do n\u011bj zn\u00e1m\u00fd proud. Zku\u0161ebn\u00ed p\u0159\u00edstroj rovn\u011b\u017e m\u011b\u0159\u00ed \u00fabytek nap\u011bt\u00ed na vodi\u010di a vypo\u010d\u00edt\u00e1 st\u0159\u00eddavou impedanci vyd\u011blen\u00edm \u00fabytku nap\u011bt\u00ed vst\u0159ikovan\u00fdm proudem. Metoda s kle\u0161t\u011bmi je jednoduch\u00e1 a rychl\u00e1, ale nemus\u00ed b\u00fdt p\u0159esn\u00e1, pokud jsou v syst\u00e9mu paraleln\u00ed cesty nebo bludn\u00e9 proudy.<\/p>\n\n\n\n

Porovn\u00e1n\u00ed obou test\u016f a jejich v\u00fdznamu<\/h2>\n\n\n\n

Oba v\u00fd\u0161e popsan\u00e9 testy se li\u0161\u00ed sv\u00fdm \u00fa\u010delem, metodami a v\u00fdsledky. Zkou\u0161ka vzd\u00e1len\u00e9ho zemn\u00edho odporu uzem\u0148ovac\u00ed elektrody je ur\u010dena k vyhodnocen\u00ed v\u00fdkonu elektrody p\u0159i odv\u00e1d\u011bn\u00ed poruchov\u00fdch proud\u016f a prevenci p\u0159ep\u011bt\u00ed. Zkou\u0161ka st\u0159\u00eddav\u00e9 impedance uzem\u0148ovac\u00edho syst\u00e9mu je ur\u010dena k vyhodnocen\u00ed v\u00fdkonnosti syst\u00e9mu p\u0159i vyrovn\u00e1v\u00e1n\u00ed potenci\u00e1l\u016f uzemn\u011bn\u00fdch \u010d\u00e1st\u00ed a sni\u017eov\u00e1n\u00ed \u0161umu a ru\u0161en\u00ed. P\u0159i zkou\u0161ce vzd\u00e1len\u00e9ho zemn\u00edho odporu se pou\u017e\u00edv\u00e1 metoda poklesu potenci\u00e1lu se dv\u011bma pomocn\u00fdmi elektrodami, zat\u00edmco p\u0159i zkou\u0161ce st\u0159\u00eddav\u00e9 impedance se pou\u017e\u00edv\u00e1 metoda kle\u0161\u0165ov\u00e1 s transform\u00e1torem proudu s rozd\u011blen\u00fdm j\u00e1drem. Zkou\u0161ka vzd\u00e1len\u00e9ho zemn\u00edho odporu ud\u00e1v\u00e1 hodnotu v ohmech, zat\u00edmco zkou\u0161ka st\u0159\u00eddav\u00e9 impedance ud\u00e1v\u00e1 hodnotu v ohmech nebo miliohmech v z\u00e1vislosti na frekvenci proudu.<\/p>\n\n\n\n

Oba testy jsou d\u016fle\u017eit\u00e9 pro zaji\u0161t\u011bn\u00ed bezpe\u010dnosti a spolehlivosti elektrick\u00fdch<\/a> za\u0159\u00edzen\u00ed. Uzem\u0148ovac\u00ed elektroda s vysok\u00fdm vzd\u00e1len\u00fdm zemn\u00edm odporem nemus\u00ed b\u00fdt schopna \u00fa\u010dinn\u011b odv\u00e1d\u011bt poruchov\u00e9 proudy a m\u016f\u017ee zp\u016fsobit p\u0159ep\u011bt\u00ed, kter\u00e9 m\u016f\u017ee po\u0161kodit za\u0159\u00edzen\u00ed a ohrozit osoby. Zemnic\u00ed soustava s vysokou st\u0159\u00eddavou impedanc\u00ed nemus\u00ed b\u00fdt schopna udr\u017eet stejn\u00fd potenci\u00e1l mezi uzemn\u011bn\u00fdmi \u010d\u00e1stmi a m\u016f\u017ee zp\u016fsobit nebezpe\u010d\u00ed \u00farazu elektrick\u00fdm proudem a zkreslen\u00ed sign\u00e1lu. Proto by se ob\u011b zkou\u0161ky m\u011bly prov\u00e1d\u011bt pravideln\u011b a podle normy a p\u0159edpisy<\/a> pr\u016fmyslu.<\/p>\n\n\n\n

Pro\u010d je nutn\u00e9 prov\u00e9st oba testy<\/h2>\n\n\n\n

Proveden\u00ed obou zkou\u0161ek pozemn\u00edho syst\u00e9mu je z hlediska bezpe\u010dnosti nezbytn\u00e9, proto\u017ee se vz\u00e1jemn\u011b dopl\u0148uj\u00ed a poskytuj\u00ed komplexn\u00ed posouzen\u00ed funk\u010dnosti pozemn\u00edho syst\u00e9mu. Uzem\u0148ovac\u00ed elektroda s n\u00edzk\u00fdm vzd\u00e1len\u00fdm zemn\u00edm odporem m\u016f\u017ee zajistit \u00fa\u010dinn\u00e9 odveden\u00ed poruchov\u00fdch proud\u016f a zabr\u00e1nit vzniku p\u0159ep\u011bt\u00ed, ale nemus\u00ed b\u00fdt dostate\u010dn\u00e1 pro ochranu za\u0159\u00edzen\u00ed a person\u00e1lu p\u0159ed nebezpe\u010d\u00edm \u00farazu elektrick\u00fdm proudem a zkreslen\u00edm sign\u00e1lu, pokud m\u00e1 syst\u00e9m uzemn\u011bn\u00ed vysokou st\u0159\u00eddavou impedanci. Naopak syst\u00e9m uzemn\u011bn\u00ed s n\u00edzkou st\u0159\u00eddavou impedanc\u00ed m\u016f\u017ee zajistit vyrovn\u00e1n\u00ed potenci\u00e1l\u016f uzemn\u011bn\u00fdch \u010d\u00e1st\u00ed a sn\u00ed\u017een\u00ed \u0161umu a ru\u0161en\u00ed, ale nemus\u00ed b\u00fdt dostate\u010dn\u00fd k ochran\u011b za\u0159\u00edzen\u00ed a person\u00e1lu p\u0159ed p\u0159ep\u011bt\u00edm a nebezpe\u010d\u00edm po\u017e\u00e1ru, pokud m\u00e1 uzem\u0148ovac\u00ed elektroda vysok\u00fd vzd\u00e1len\u00fd zemn\u00ed odpor. Proto je t\u0159eba ob\u011b zkou\u0161ky jsou nezbytn\u00e9 k ov\u011b\u0159en\u00ed, zda je pozemn\u00ed syst\u00e9m<\/a> spl\u0148uje po\u017eadavky na bezpe\u010dnost a v\u00fdkonnost v tomto odv\u011btv\u00ed.<\/p>\n\n\n\n

Spole\u010dnost Dreiym Engineering m\u016f\u017ee pomoci t\u00edm, \u017ee poskytne odborn\u00e9 znalosti pot\u0159ebn\u00e9 pro tyto testy. N\u00e1\u0161 t\u00fdm in\u017een\u00fdr\u016f m\u00e1 rozs\u00e1hl\u00e9 zku\u0161enosti a znalosti s prov\u00e1d\u011bn\u00edm zkou\u0161ek zemn\u00edho odporu na d\u00e1lku i zkou\u0161ek impedance st\u0159\u00eddav\u00e9ho proudu pomoc\u00ed nejmodern\u011bj\u0161\u00edho vybaven\u00ed a technik. M\u016f\u017eeme tyto testy prov\u00e1d\u011bt v souladu s normami a p\u0159edpisy v oboru a poskytnout v\u00e1m p\u0159esn\u00e9 a spolehliv\u00e9 v\u00fdsledky. M\u016f\u017eeme v\u00e1m tak\u00e9 pomoci s interpretac\u00ed v\u00fdsledk\u016f a doporu\u010dit nejlep\u0161\u00ed \u0159e\u0161en\u00ed pro zlep\u0161en\u00ed va\u0161eho pozemn\u00ed syst\u00e9m<\/a>a bezpe\u010dnosti. Kontaktujte n\u00e1s<\/a> si je\u0161t\u011b dnes domluvit sch\u016fzku nebo po\u017e\u00e1dat o cenovou nab\u00eddku.<\/p>","protected":false},"excerpt":{"rendered":"

Grounding electrodes and ground bonding systems are essential components of electrical installations that provide safety and protection for people and equipment. Grounding electrodes are conductive rods or plates that are buried in the earth and connected to the electrical system. They provide a low-resistance path for fault currents to flow to the earth and prevent […]<\/p>\n","protected":false},"author":8,"featured_media":4739,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":true,"_pgmb_ap_template_id":0,"iawp_total_views":199,"footnotes":""},"categories":[4,7],"tags":[],"class_list":["post-4738","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical","category-engineering"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t