El cartró Dielèctric està format per capes sobre posades, de color marró. És fàcil tallar-l'ho, és de gran resistència i en menor escala elàstic. La seva densitat oscil·la entre 1'2 i 1'3 segons espessor.
És una mica higroscopi i per tant absorbeix fàcilment l'humitat. Químicament està fabricat de materials neutres, estant casi exempt de minerals i lliure de sals, àlcalis i àcids.
Dintre de les seves caracterí1stiques és immillorable com aïllant de l'electricitat. La tensió de perforació en plaques no superiors a un gruix de 2mm es de 10.000 volts.
En la capacitat específica o constant dielèctrica es aproximadament igual al oli de transformador. Submergit en oli té una gran resistència al calor.
En la indústria elèctrica té infinitat d'aplicacions on no sigui necessari un gran aïllament i no existeixi excessiva humitat, per exemple: comptadors elèctrics, condensadors, aparells de radio, transformadors, motors, etc...
En el camps d'aplicació en la tècnica d'alta tensió s'utilitza en la construcció de transformadors en plaques de 2 a 4mm de gruix, i per baixa tensió de 0'5 a 2mm com a material aïllant en centrals telefòniques, anell de col·lector, i bobines per aïllament entre capes, etc.
El cartró Dielèctric és indeformable, contenint aire entre la seva massa. La cel·lulosa pura que el forma és així aïllant. L'aire retingut entre les seves fibres augmenta el efecte aïllant, que és tant major quant més sec sigui el cartró. Per això està indicat el seu ús per aïllar peces i conductors portadors de corrent elèctrica.
| Gruix | Tensió deperforació (volt) | Cendres % | Assaig d’insolubilitat dels colorants en oli mineral |
| 0’5 mm | 7.000 | 5’4 | Insoluble |
| 1mm | 15.000 | 5’5 | Insoluble |
| 2mm | 28.000 | 5’5 | Insoluble |
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| Query | Error | Affected | Num. rows | Took (ms) | Actions |
|---|---|---|---|---|---|
| SHOW FULL COLUMNS FROM `aros` | 7 | 7 | 0 | ||
| SHOW FULL COLUMNS FROM `acos` | 7 | 7 | 0 | ||
| SHOW FULL COLUMNS FROM `aros_acos` | 7 | 7 | 0 | ||
| SHOW FULL COLUMNS FROM `contents` | 12 | 12 | 0 | ||
| SHOW FULL COLUMNS FROM `i18n` | 6 | 6 | 0 | ||
| SHOW FULL COLUMNS FROM `configurations` | 3 | 3 | 0 | ||
| SELECT `Configuration`.*, `I18n__value`.`content`, `Configuration`.`id` FROM `configurations` AS `Configuration` LEFT JOIN `i18n` AS `I18n__value` ON (`Configuration`.`id` = `I18n__value`.`foreign_key` AND `I18n__value`.`model` = 'Configuration' AND `I18n__value`.`field` = 'value') WHERE `I18n__value`.`locale` = 'cat' | 15 | 15 | 0 | ||
| SELECT `Values`.`id`, `Values`.`locale`, `Values`.`model`, `Values`.`foreign_key`, `Values`.`field`, `Values`.`content` FROM `i18n` AS `Values` WHERE `model` = 'Configuration' AND `field` = 'value' AND `Values`.`foreign_key` IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 11, 12, 13, 14) | 55 | 55 | 0 | ||
| SHOW FULL COLUMNS FROM `sections` | 13 | 13 | 0 | ||
| SELECT `Section`.*, `ParentSection`.*, `I18n__title`.`content`, `Section`.`id` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') LEFT JOIN `sections` AS `ParentSection` ON (`Section`.`parent_id` = `ParentSection`.`id`) WHERE `Section`.`parent_id` IS NULL AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`sort` ASC | 3 | 3 | 0 | ||
| SELECT `Section`.*, `ParentSection`.*, `I18n__title`.`content`, `Section`.`id` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') LEFT JOIN `sections` AS `ParentSection` ON (`Section`.`parent_id` = `ParentSection`.`id`) WHERE `Section`.`id` = 21 AND `I18n__title`.`locale` = 'cat' LIMIT 1 | 1 | 1 | 0 | ||
| SELECT `Section`.*, `ParentSection`.*, `I18n__title`.`content`, `Section`.`id` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') LEFT JOIN `sections` AS `ParentSection` ON (`Section`.`parent_id` = `ParentSection`.`id`) WHERE `Section`.`parent_id` = 13 AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`sort` ASC | 6 | 6 | 0 | ||
| SELECT `Section`.`lft`, `Section`.`rght` FROM `sections` AS `Section` WHERE `Section`.`id` = 21 LIMIT 1 | 1 | 1 | 0 | ||
| SELECT `Section`.*, `I18n__title`.`content` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') WHERE 1 = 1 AND `Section`.`lft` <= 18 AND `Section`.`rght` >= 19 AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`lft` asc | 2 | 2 | 1 | maybe slow | |
| SHOW FULL COLUMNS FROM `content_files` | 8 | 8 | 0 | ||
| SHOW FULL COLUMNS FROM `content_links` | 5 | 5 | 0 | ||
| SELECT `Content`.*, `Section`.*, `I18n__title`.`content`, `I18n__text`.`content`, `Content`.`id` FROM `contents` AS `Content` LEFT JOIN `i18n` AS `I18n__title` ON (`Content`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Content' AND `I18n__title`.`field` = 'title') LEFT JOIN `i18n` AS `I18n__text` ON (`Content`.`id` = `I18n__text`.`foreign_key` AND `I18n__text`.`model` = 'Content' AND `I18n__text`.`field` = 'text') LEFT JOIN `sections` AS `Section` ON (`Content`.`section_id` = `Section`.`id`) WHERE `section_id` = 21 AND `I18n__title`.`locale` = 'cat' AND `I18n__text`.`locale` = 'cat' | 1 | 1 | 1 | ||
| SELECT `ContentFile`.`id`, `ContentFile`.`content_id`, `ContentFile`.`filename`, `ContentFile`.`dir`, `ContentFile`.`mimetype`, `ContentFile`.`filesize`, `ContentFile`.`created`, `ContentFile`.`modified` FROM `content_files` AS `ContentFile` WHERE `ContentFile`.`content_id` = (9) | 0 | 0 | 0 | ||
| SELECT `ContentLink`.`id`, `ContentLink`.`content_id`, `ContentLink`.`link`, `ContentLink`.`created`, `ContentLink`.`modified` FROM `content_links` AS `ContentLink` WHERE `ContentLink`.`content_id` = (9) | 0 | 0 | 0 | ||
| SELECT `Titles`.`id`, `Titles`.`locale`, `Titles`.`model`, `Titles`.`foreign_key`, `Titles`.`field`, `Titles`.`content` FROM `i18n` AS `Titles` WHERE `model` = 'Content' AND `field` = 'title' AND `Titles`.`foreign_key` = (9) | 3 | 3 | 0 | ||
| SELECT `Texts`.`id`, `Texts`.`locale`, `Texts`.`model`, `Texts`.`foreign_key`, `Texts`.`field`, `Texts`.`content` FROM `i18n` AS `Texts` WHERE `model` = 'Content' AND `field` = 'text' AND `Texts`.`foreign_key` = (9) | 3 | 3 | 0 | ||
| SELECT `Configuration`.*, `I18n__value`.`content`, `Configuration`.`id` FROM `configurations` AS `Configuration` LEFT JOIN `i18n` AS `I18n__value` ON (`Configuration`.`id` = `I18n__value`.`foreign_key` AND `I18n__value`.`model` = 'Configuration' AND `I18n__value`.`field` = 'value') WHERE `I18n__value`.`locale` = 'cat' | 15 | 15 | 0 | ||
| SELECT `Values`.`id`, `Values`.`locale`, `Values`.`model`, `Values`.`foreign_key`, `Values`.`field`, `Values`.`content` FROM `i18n` AS `Values` WHERE `model` = 'Configuration' AND `field` = 'value' AND `Values`.`foreign_key` IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 11, 12, 13, 14) | 55 | 55 | 0 | ||
| SELECT `Section`.*, `ParentSection`.*, `I18n__title`.`content`, `Section`.`id` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') LEFT JOIN `sections` AS `ParentSection` ON (`Section`.`parent_id` = `ParentSection`.`id`) WHERE `Section`.`parent_id` IS NULL AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`sort` ASC | 3 | 3 | 0 | ||
| SELECT `Section`.*, `I18n__title`.`content` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') WHERE `Section`.`parent_id` = 12 AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`sort` ASC | 2 | 2 | 0 | ||
| SELECT `Configuration`.*, `I18n__value`.`content`, `Configuration`.`id` FROM `configurations` AS `Configuration` LEFT JOIN `i18n` AS `I18n__value` ON (`Configuration`.`id` = `I18n__value`.`foreign_key` AND `I18n__value`.`model` = 'Configuration' AND `I18n__value`.`field` = 'value') WHERE `I18n__value`.`locale` = 'cat' | 15 | 15 | 0 | ||
| SELECT `Values`.`id`, `Values`.`locale`, `Values`.`model`, `Values`.`foreign_key`, `Values`.`field`, `Values`.`content` FROM `i18n` AS `Values` WHERE `model` = 'Configuration' AND `field` = 'value' AND `Values`.`foreign_key` IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 11, 12, 13, 14) | 55 | 55 | 0 | ||
| SELECT `Section`.*, `ParentSection`.*, `I18n__title`.`content`, `Section`.`id` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') LEFT JOIN `sections` AS `ParentSection` ON (`Section`.`parent_id` = `ParentSection`.`id`) WHERE `Section`.`parent_id` IS NULL AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`sort` ASC | 3 | 3 | 0 | ||
| SELECT `Section`.*, `I18n__title`.`content` FROM `sections` AS `Section` LEFT JOIN `i18n` AS `I18n__title` ON (`Section`.`id` = `I18n__title`.`foreign_key` AND `I18n__title`.`model` = 'Section' AND `I18n__title`.`field` = 'title') WHERE `Section`.`parent_id` = 13 AND `I18n__title`.`locale` = 'cat' ORDER BY `Section`.`sort` ASC | 6 | 6 | 0 |
Peak Memory Use 11.44 MB
| Message | Memory use |
|---|---|
| Component intitailization | 7.50 MB |
| Controller action start | 7.92 MB |
| Controller render start | 8.16 MB |
| Component intitailization #2 | 9.84 MB |
| Controller action start #2 | 9.88 MB |
| Component intitailization #3 | 9.91 MB |
| Controller action start #3 | 9.94 MB |
| View render complete | 9.81 MB |
Total Request Time: 566 (ms)
| Message | Time in ms | Graph |
|---|---|---|
| Core Processing (Derived) | 322.07 | |
| Component initialization and startup | 26.78 | |
| Controller action | 26.59 | |
| Render Controller Action | 59.16 | |
| » Rendering View | 56.23 | |
| » » Rendering APP/views/sections/view.ctp | 22.30 | |
| » » » Rendering APP/views/elements/submenu.ctp | 2.84 | |
| » » Rendering APP/views/layouts/default.ctp | 33.43 | |
| » » » Rendering APP/views/elements/menu.ctp | 31.79 | |
| » » » » Component initialization and startup #2 | 9.44 | |
| Controller action #2 | 0.00 | |
| » » » » » Component initialization and startup #3 | 9.10 | |
| Controller action #3 | 0.00 |