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/*图片放大+遮罩层渐现*/
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/*图片缩小+遮罩层渐现*/
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/*图片底部向上+遮罩层透明向右展开*/
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/*遮罩层左侧渐入*/
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/*遮罩层右侧渐入*/
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/*遮罩层顶部渐入*/
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/*遮罩层底部渐入*/
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.hoverImg.bottomGradually:hover .p-more {opacity:1;height: 100%;top: auto; bottom: 0;}

/*遮罩层中间向两边展开*/
.hoverImg.middleUnfolding .p-more{transform: scale3d(0, 1, 0);transform-origin: center;opacity: 0;-webkit-transform: scale3d(0, 1, 0);-webkit-transform-origin: center;visibility: hidden;left:0;right:0;top:0;bottom:0;}
.hoverImg.middleUnfolding:hover .p-more {opacity: 1;transform: scale3d(1, 1, 1);-webkit-transform: scale3d(1, 1, 1);visibility: visible;height: 100%;}.CrumbsBox{display: block;}.CrumbsBox .btnIcon, .CrumbsBox .currentPosFont{display: inline-block; vertical-align: middle;}.CrumbsBox .currentPosFont{max-width: calc(100% - 28px);}.listTxt{position: relative;}.rList .listTxt > div p, .rList .listTxt p, .rList .listTxt .textLineP{overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical;}.listTxt .textLineP{overflow: hidden;}.textLineP iframe{max-width:100%;}.listTxt > a, .listTxt{display: block; box-sizing: border-box;}.listTxt ul p, .listTxt ol p{display: inline-block; vertical-align: top; max-width: calc(100% - 25px);}.listTxt.enlarge_detailed_info ul p,.listTxt.enlarge_detailed_info ol p{width:100%}.listTxt ul, .listTxt ol{list-style-position: inside;}table[align="center"]{margin: 10px auto;}.overflowScrolling::-webkit-scrollbar{width: 6px;}.overflowScrolling::-webkit-scrollbar-thumb{background-color: rgba(0, 0, 0, 0.5); border-radius: 32px;}.overflowScrolling::-webkit-scrollbar-track{background-color: rgba(0, 0, 0, 0.1); border-radius: 32px;}div.search, form.searchBox{display: flex; -webkit-box-align: center; align-items: center; -webkit-box-pack: center; justify-content: stretch; overflow: hidden;}.searchInputCont{display: flex; -webkit-box-flex: 1; flex: 1 1 0%; box-sizing: border-box;}.searchInput{overflow: hidden; text-overflow: ellipsis; background: inherit; width: 100%; border: 0px; outline: 0px; appearance: none;}button.hidden{display: none;}.search-history-tool{display:flex;justify-content: space-between;align-items: center;height:30px;padding:5px;font-size:13px;}.search-history-tool  div:last-child{cursor: pointer;}.search-history ul{font-size:13px;max-height:300px;overflow:auto;}.search-history li{padding:5px;color:#555;display:flex;justify-content: space-between;align-items: center;}.search-history li > div:last-child{width:20px;flex-shrink:0;display:flex;justify-content: flex-end;align-items: center;cursor: pointer;}.search-history li > div:first-child{ width:calc(100% - 20px);list-style-type:none;white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: pointer;}.search-history li:hover{background-color:#e0e0e0;}.search-history{position:absolute;left:0;width:100%;background-color:#fff;box-shadow:-6px 0 16px -8px #00000014,-9px 0 28px #0000000d,-12px 0 48px 16px #00000008;z-index:9999;padding:5px;}.searchbox1 .btn2{min-width: 70px; margin-right: -1px; display: inline-block; margin-bottom: -1px;}.listBox, .rList2 .listBox .Imgbox, .rList2 .listBox .listCon{display: inline-block;}.proList .listBox .ImghidCont{overflow: hidden;}#catsys{position: relative;top: 0;left: 0;display:block;}.hoverListCont{position: relative;top: 0;left: 0;}.listBox, .listBoxHref{box-sizing: border-box;}.listBoxHref, .rListRow .listBox .listBoxHref{position: relative;}.listBoxHref{height: auto;}.rList, .rowList, .rowList .colList{position: relative;}.listBoxHref, .rList2 .proList, .rList2 .listBox{display: block;}.rList1 .listBox .Imgbox .img{max-width: 100%; max-height: 100%; position: absolute; inset: 0px; margin: auto; width: 100%; height: 100%; object-fit: cover;}.rListCol .bx-controls-direction .bx-prev,.rListCol .bx-controls-direction .bx-next{position: absolute; top: 50%; margin-top: -25px;outline: 0; width: 50px;height: 50px;cursor: pointer; z-index: 1;text-align: center;line-height: 50px; background: rgba(0, 0, 0, 0.2);}.rListCol .bx-controls-direction .yiyingbaoicon{color: rgb(255, 255, 255);font-size:22px;}.listrowCol .bx-controls-direction .bx-prev,.listrowCol .bx-controls-direction .bx-next{position: absolute; left: 50%; margin-left: -25px;outline: 0; width: 50px;height:24px;line-height: 24px;cursor: pointer; z-index: 999;margin-top: 0px;text-align: center;background: rgba(0, 0, 0, 0.2);}.listrowCol .bx-controls-direction .bx-prev{top:0px;}.listrowCol .bx-controls-direction .bx-next{bottom:0px;top:auto;}.listrowCol .bx-controls-direction .yiyingbaoicon{color: rgb(255, 255, 255);font-size:18px;}.rListCol .seamlessRolling .bx-prev{left: 10px;}.rListCol .seamlessRolling .bx-next{right: 10px;}.listrowCol .seamlessRolling .bx-prev{top: 0px;}.listrowCol .seamlessRolling .bx-next{bottom: 0px;}.switchInmage .activeImage, .switchInmage:hover .firstImage{z-index: -5; opacity: 0; transition: 0.3s;}.switchInmage:hover .activeImage{z-index: 100; opacity: 1;}.proList{display: flex; flex-wrap: wrap; -webkit-box-align: stretch; align-items: stretch;}.listBox{display: inline-block; box-sizing: border-box; position: relative;}.rList1 .listBox .Imgbox{width: 100%; height: auto; overflow: hidden;}.rList .hoverImg .img{object-fit: cover;}.rList1 .listBox .listTxt p{overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical;}.rList1 .listBox .Imgbox, .rList2 .listBox .Imgbox, .rList3 .listBox .Imgbox{text-align: center; position: relative;}.rList .bx-viewport > .proList > li{padding-top: 5px; padding-bottom: 5px;}.listrowCol .listBox{zoom: 1; vertical-align: top}.listrowCol .proList li{display: inline-block; width: 100%;}.listrowCol .Imgbox{padding-top: 60%;}.listrowCol .listBox .Imgbox .img{max-width: 100%; max-height: 100%; position: absolute; inset: 0px; margin: auto; width: 100%; height: 100%; object-fit: contain;}.classMenubox{z-index: 1;position: relative;}.verticalNav{width: 100%;}
.verticalNav,.verticalNav li{list-style: none;}
.verticalNav .mainNavLi{position: relative;}
.verticalNav .mainNavLiA>p{width:100%;}
.verticalNav .showArrowstyle .mainNavLiA>p,.vershowsubNav .showArrowstyle .mainNavLiA>p{width: calc(100% - 30px);}
.menuPageIcon.menuItemEqual .mainNavLi > .mainNavLiA p{max-width: 100%;}
.menuPageIcon.menuItemEqual>.showArrowstyle>.mainNavLiA>p{max-width:calc(100% - 22px);width: auto;}
verticalNav .mainNavLi [data-position="downWard"]{position: relative;display: none}
.verticalNav .mainNavLiA{display: block;position:relative;}
.verticalNav .textShow .mainNavLiA  p,.verticalNav .textShow .nav-submenu .nav-submenuA  p,.vershowsubNav .textShow .mainNavLiA  p,.vershowsubNav .textShow .nav-submenu .nav-submenuA  p{white-space: nowrap;overflow: hidden;text-overflow: ellipsis;}
.verticalNav .lineFeed .mainNavLiA  p,.verticalNav .lineFeed .nav-submenu .nav-submenuA  p,.vershowsubNav .lineFeed .mainNavLiA  p,.vershowsubNav .lineFeed .nav-submenu .nav-submenuA  p,
.pcMainnav .verticalNav .lineFeed .mainNavLiA  p,.pcMainnav .verticalNav .lineFeed .nav-submenu .nav-submenuA  p,.pcMainnav .vershowsubNav .lineFeed .mainNavLiA  p,.pcMainnav .vershowsubNav .lineFeed .nav-submenu .nav-submenuA  p{white-space: inherit;text-overflow:inherit; overflow:inherit;}
.verticalNav .mainNavLi .mainNavLiA>i,.menuPageIcon[data-position="downWard"] .mainNavLi:hover .mainNavLiA>i{position: absolute;font-size: 16px;line-height: 28px;letter-spacing: 0.07em;right: 10px; top: 50%; -webkit-transform: translateY(-50%) rotate(0deg);-khtml-transform: translateY(-50%) rotate(0deg); -moz-transform: translateY(-50%) rotate(0deg);-ms-transform: translateY(-50%) rotate(0deg); -o-transform: translateY(-50%) rotate(0deg); transform: translateY(-50%) rotate(0deg);transition: transform 0.3s; -moz-transition: -moz-transform 0.3s;  -webkit-transition: -webkit-transform 0.3s; -o-transition: -o-transform 0.3s;}
.rtlAr .verticalNav .mainNavLi .mainNavLiA>i,.rtlAr .menuPageIcon[data-position="downWard"] .mainNavLi:hover .mainNavLiA>i{right: auto;left:10px}
[data-position="rightWard"] .mainNavLi .mainNavLiA>i{ -webkit-transform: translateY(-50%) rotate(-90deg);-khtml-transform: translateY(-50%) rotate(-90deg); -moz-transform: translateY(-50%) rotate(-90deg);-ms-transform: translateY(-50%) rotate(-90deg); -o-transform: translateY(-50%) rotate(-90deg); transform: translateY(-50%) rotate(-90deg);}
.rtlAr [data-position="rightWard"] .mainNavLi .mainNavLiA>i{ -webkit-transform: translateY(-50%) rotate(90deg);-khtml-transform: translateY(-50%) rotate(90deg); -moz-transform: translateY(-50%) rotate(90deg);-ms-transform: translateY(-50%) rotate(90deg); -o-transform: translateY(-50%) rotate(90deg); transform: translateY(-50%) rotate(90deg);}
[data-position="downWard"] .mainNavLi .nav-submenu{width:100%!important;left: 0;}
[data-position="downWard"] .mainNavLi:hover .mainNavLiA>i{transform: rotate(180deg) translateY(50%) ;-webkit-transform: rotate(180deg) translateY(50%) ;  -moz-transform: rotate(180deg) translateY(50%) ; -ms-transform: rotate(180deg) translateY(50%) ; -o-transform: rotate(180deg) translateY(50%) ;}
[data-position="downWard"] .mainNavLi>.nav-submenu,[data-position="downWard"] .mainNavLi>.nav-submenu .nav-submenu{width:100%!important}
/*.menuPageIcon[data-position="downWard"] [data-index="2"] .subnavbtn{text-indent:1em}
.menuPageIcon[data-position="downWard"] [data-index="3"] .subnavbtn{text-indent:2em}
.menuPageIcon[data-position="downWard"] [data-index="4"] .subnavbtn{text-indent:3em}*/
[data-position="rightWard"] .nav-submenu>li>.nav-submenu{position:absolute;}.menubox{position:relative;}
.nav{ zoom: 1;}
.nav:after { clear:both;content:'';display:block;width:0;height:0;visibility:hidden; }
.pcMainnav{display: -webkit-box;display: -ms-flexbox;display: flex; flex-wrap: wrap;}
.pcMainnav > li, .pcMainnav li a p{display: inline-block}
.nav,.pcMainnav > li,.pcMainnav > li > a{position: relative;}
.nav .menuItemEqual> li .mainNavLiA{display: block;}
.pcMainnav .menuItemEqual{flex-wrap: nowrap;}
.pcMainnav > li:last-of-type{margin-right:0!important}
.rtlAr .pcMainnav > li:last-of-type{margin-left:0!important}
.nav .menuItemLayout > li > a{display:block;}
.pcMainnav > li > a{display: inline-block;}
.nav i{font-style:initial;}
.nav .pcMainnav > li .mainNavLiA  {cursor: pointer;}
.nav .pcMainnav > li > .mainNavLiA {outline: 0;white-space: nowrap;box-sizing: border-box;}
.nav .pcMainnav .mainNavLi{list-style: none;display: inline-block;}
.pcMainnav .mainNavLi .mainNavLiA  p,.pcMainnav .nav-submenu li a p{display:inline-block;overflow: hidden;white-space: nowrap;text-overflow:ellipsis;vertical-align: middle;box-sizing: border-box;}
.nav .mainNav .mainNavLi .mainNavLiA  i{font-size:13px; margin-left:10px;vertical-align: middle;}
.rtlAr .nav .mainNav .mainNavLi .mainNavLiA  i{ margin-right:10px;}
.mainNavLi .editShowsubmenu {display: block;}
.pcMainnav .nav-submenu li a p{padding-right:10px;}
/*.pcMainnav  .showArrowstyle .mainNavLiA>p{max-width:calc(100% - 23px);}*/
@media screen and (max-width: 960px) {
.nav .pcMainnav > li{width:auto!important;}
}
.pcMainnav .subMenuAligncenter>.nav-submenu{left:50%!important;transform: translateX(-50%);-webkit-transform: translateX(-50%);}
.pcMainnav .subMenuAlignright>.nav-submenu{left:auto!important;right:0}.btnIcon{text-align:center;}
.btnImg{max-width:100%;max-height:100%;}
.minWidth{position: relative;top: 0;left: 0;display: block;transform: scale(1);transform: rotate(0);}
.btnAnati{position: relative;top: 0;left:0;transform: scale(1);transform: rotate(0);}

.backgroundAnimation,.borderSlide,.shadowAcross,.backgroundBottomAna {overflow: hidden;-webkit-transition:0.5s;}
.backgroundAnimation:before,.btn3.backgroundAnimation .btnIcon:before {position:absolute;content:'';width:0;-webkit-transition: inherit;left: 0;height: 100%;z-index: -1;}
.backgroundAnimation:hover:before,.btn3.backgroundAnimation .btnIcon:before {width:100%}
.borderSlide:before, .borderSlide:after{content: '';border-style: solid; position: absolute;z-index: -1; transition: inherit;left: 0;right: 0;  top: 0;  bottom: 0;}
.borderSlide:before{width: 0;border-top-width: 0px;
border-bottom-width: 0px;border-left-width: 0px;
border-right-width: 0px;
    height: 100%; 
    top: 0px;
    left: 0;
-webkit-transition-delay: 0.05s;
    transition-delay: 0.05s;
   }
.borderSlide:after{width: 100%;border-left-width: 0px;
border-right-width: 0px;border-top-width: 0px;
border-bottom-width: 0px;
    height: 0;
    top: 0;
    left:0px;}
.borderSlide:hover:before{width: 100%;}
.borderSlide:hover:after{height: 100%; }

.shadowAcross:after{background: #fff;
    content: "";
    height: 155px;
    left: -75px;
    opacity: 0.2;
    position: absolute;
    top: -50px;
    transform: rotate(35deg);
    transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
    width: 50px;
    z-index: -10;
}
.shadowAcross:hover:after {
    left: 120%;
    transition: all 550ms cubic-bezier(0.19, 1, 0.22, 1);
}

.backgroundBottomAna{}
.backgroundBottomAna:before {position:absolute;content:'';width:100%;-webkit-transition: inherit;left: 0;height: 0;z-index: -1;bottom: 0;}
.backgroundBottomAna:hover:before{height:100%;}.btn3{display:table;margin-left:auto;margin-right:auto;}
.btn3 i{display: block;}
.btnbox{max-width:100%}
.btn3 i,.btn3 .btnIcon{box-sizing: content-box;}
.btn2{display: block;}
.btn2 span{display: block;}.btn .btnText{display:inline-block;box-sizing:border-box;white-space: nowrap;overflow: hidden;text-overflow: ellipsis; max-width: calc(100% - 40px);}
.btn{display:block;min-width:50px}
.btn,.btn .btnIcon,.btn .btnText{vertical-align: middle;}
.btnCont{position: relative;}
.btn .btnIcon{display: inline-block;}
.boxCont {
    position: relative;
}.boxContent,.boxCont{position: relative;}.hoverBoxCont{top:0;left:0;} .box_link{display:none;} [data-link="1"]{cursor: pointer;}.nav-submenu .nav-submenuA {position:relative}.nav-submenu li .nav-submenuA i{position: absolute;font-size: 16px;line-height: 22px;letter-spacing: 0.07em;right: 10px;top: 50%;-webkit-transform: translateY(-50%) rotate(0deg);-khtml-transform: translateY(-50%) rotate(0deg);-moz-transform: translateY(-50%) rotate(0deg);-ms-transform: translateY(-50%) rotate(0deg);-o-transform: translateY(-50%) rotate(0deg);transform: translateY(-50%) rotate(0deg);transition: transform 0.3s;-moz-transition: -moz-transform 0.3s;-webkit-transition: -webkit-transform 0.3s;-o-transition: -o-transform 0.3s;}[data-position="downWard"] .nav-submenu li a i,.menuPageIcon[data-position="downWard"] .nav-submenu li:hover a i { -webkit-transform: translateY(-50%) rotate(90deg) ; -khtml-transform: translateY(-50%) rotate(90deg) ; -moz-transform: translateY(-50%) rotate(90deg) ; -ms-transform: translateY(-50%) rotate(90deg) ; -o-transform: translateY(-50%) rotate(90deg);transform: translateY(-50%) rotate(90deg);}[data-position="downWard"] .nav-submenu li>.nav-submenuA:hover i { -webkit-transform: translateY(-50%) rotate(270deg) ; -khtml-transform: translateY(-50%) rotate(270deg) ; -moz-transform: translateY(-50%) rotate(270deg) ; -ms-transform: translateY(-50%) rotate(270deg) ;-o-transform: translateY(-50%) rotate(270deg);transform: translateY(-50%) rotate(270deg);}.mainNav .nav-submenu{margin: 0;list-style: none;z-index: 1999;position: absolute;top: 99%;box-sizing:border-box;width: auto;display:none}.verticalNav .nav-submenu{margin: 0;list-style: none;box-sizing:border-box;width: 100%;display:none}.nav-submenu li{display: block;width: 100%;position: relative;}.nav-submenu li .nav-submenuA p{box-sizing: border-box;white-space: nowrap;overflow: hidden;text-overflow: ellipsis;display: inline-block;width:100%}.nav-submenu .showArrowstyle>.nav-submenuA >.subnavbtn,.nav-submenu .nav-submenu .showArrowstyle>.nav-submenuA >.subnavbtn{display: inline-block;width: calc(100% - 28px);}.verticalNav[data-position="downWard"] .nav-submenu li .nav-submenu .nav-submenuA .subnavbtn{padding-left:40px!important;}.nav-submenu > li > .nav-submenu{top: 0px; left: 100%; display: none;}.pcMainnav .nav-submenu > li:hover > .nav-submenu, .verticalNav[data-mouse="onmouseover"] .nav-submenu > li:hover > .nav-submenu{display: block;}[data-position="rightWard"] .nav-submenu .nav-submenu{top: 0px; left: 100%; position: absolute;}[data-position="downWard"] .nav-submenu .nav-submenu{position: relative; left: 0px; width: 100% !important;}.nav-submenu > li > .nav-submenu{top: 0px; left: 100%; display: none;}.pcMainnav .nav-submenu > li:hover > .nav-submenu, .verticalNav[data-mouse="onmouseover"] .nav-submenu > li:hover > .nav-submenu{display: block;}.langBox,.langList{box-sizing:border-box;}
.langBox .langA{box-sizing:border-box;display:inline-block;vertical-align:middle;position: relative;}
.langBox .langIcon{box-sizing:border-box;display:inline-block;vertical-align:middle;background-position:center;background-repeat:no-repeat;}
.langBox .langText{vertical-align:middle;}.dropbtn {cursor: pointer;}
.dropdown { position: relative;}
.dropbtn span{display:inline-block}
.dropdown-content { position: absolute; background-color: #fff; min-width: 100%;width:auto; left:50%;box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.13);transform: translateX(-50%);top: 100%;z-index:1000;padding:5px 0 0 0;border: 1px solid #EBEBEB;}
.dropdown-content li{list-style: none;padding:8px 0}
.dropdown-content li:hover{background: #EBEBEB;}
.dropdown-content li[data-selected="1"]{background: rgba(0, 0, 0, 0.04);}
.dropdown-content li .langIcon{max-width:24px;max-height:24px;line-height:24px}
.dropdown-content li .radioLanguage{display:none}
.dropdown-content li label{position:relative;padding-left: 44px;}
.dropdown-content li label::after{position: absolute;top: 1px;left: 14px;width: 16px;height: 16px;display: inline-block;border: 1px solid #3f3f3f; content: ' ';border-radius: 8px;}
.dropdown-content li .radioLanguage:checked + label::before{content: "";top: 5px;left: 18px;width:8px;height:8px;border-radius:5px;background:#000;position: absolute;}
.dropdown-content li .radioLanguage:checked + label::after{content: "";border: 1px solid #000;}		</style>
     	<style>
			#SITE_HEADER>.rowListBg{background:none ;}#p2ad60ec7{max-width:100%;background:rgba(0,0,0,0);}#SITE_FOOTER{background:rgb(35, 35, 35);}#SITE_FOOTER>.rowListBg{background:none ;}@media screen and (max-width:960px){#SITE_FOOTER{margin:0 0  0 0;}}#SITE_PANEL{width:100%;}#SITE_PANEL .SITE_PANELLi{border-bottom: 1px solid #eee;}#SITE_PANEL .SITE_PANELA,#SITE_PANEL .nav-submenuA{font-size:17px;color:#666;background-color:rgb(255, 255, 255);}#SITE_PANEL .SITE_PANELA.paneltextShow p,#SITE_PANEL .nav-submenuA p,#SITE_PANEL .SITE_PANELA .btnIcon,#SITE_PANEL .nav-submenuA .btnIcon,.sideTrigger~.nav-icon{height:46px;line-height:46px;}#SITE_PANEL .SITE_PANELA.panellineFeed p,#SITE_PANEL .nav-submenuA.panellineFeed p{min-height:46px;line-height:46px;}#SITE_PANEL .SITE_PANELA p{padding-left:15px;}#SITE_PANEL .SITE_PANELA.selected,#SITE_PANEL .nav-submenuA.selected{background-color:#eee;}@media screen and (min-width:961px){#SITE_PANEL{display:none;}}#c7iv8r0{left:0%;top:0%;position:fixed;z-index:3201;}.lightboxHidden{display:none;}#c7iv8r0>.lightboxModalOpc{background:rgba(0, 0, 0, 0);}.chk47mm{background-color:rgb(255, 255, 255);}#c1kgts4{background-color:rgba(0,0,0,0);}@media screen and (min-width:961px){#c1kgts4{padding-right:10%;padding-left:10%;}}@media screen and (min-width:961px) and (max-width:1905px){#document>.auto-margin>#c1kgts4{padding-right:10%;padding-left:10%;padding-left:calc((100% - 1524px) / 20 * 10);padding-right:calc((100% - 1524px) / 20 * 10);}}#cpfu2nv{background-color:rgb(247, 247, 247);}#ciefbqc{background-color:rgb(247, 247, 247);}.cgat9jm{background-color:rgba(0,0,0,0);}@media screen and (min-width:961px){.cgat9jm{margin:1% 0% 1% 0%;padding-bottom:1%;}.cgat9jm>.rowList>.col{padding:0 1%;}}.chk8lm7{background-color:rgb(50, 61, 69);}.chk8lm7>.rowListBg{background:url(https://img.bjyyb.net/system/pubimages/20161028104532719.jpg) no-repeat center center / 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id="cgb3acv"><div class="textLineP" data-source="title" data-companylabeltext="" data-defaultvalue="此处默认显示内容标题">配电自动化——小电流接地故障多级暂态方向保护应用“案件”分享</div></div><div class="listTxt cgh65l9A automatic  enlarge_detailed_info " id="cgh65l9"><div class="textLineP" data-source="detailed_info" data-companylabeltext="" data-defaultvalue="此处为新闻内容"><p style="text-indent: 2em; line-height: 2em;">山东科汇电力自动化股份有限公司（简称：科汇股份，证券代码：688681）长期致力于小电流接地故障检测技术与产品研发，是暂态原理实现小电流接地故障检测是发明者、实践者和倡导者；独特的暂态原理接地故障保护技术，解决长期困扰电网公司的配电线路接地、断线、碰树等故障检测难题，减少触电事故与电气火灾，获山东省科技进步一等奖等多项省部级奖励。本文选取一典型的线路碰树导致的歇性电弧故障定位“案件”与您分享，共同提高山林电气火灾治理水平。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="800x1067" data-size="800x1067" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161451505.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_327,h_436,limit_0" alt = "图片1.png" title ="图片1.png" 
                      width="327"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161451505.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161451505.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><span style="font-size: 18px;"><strong>一、“案件”概述</strong></span></p><p style="text-indent: 2em; line-height: 2em;">2019年7月10日下午13时许，TA供电公司调度供服中心在10分钟左右的时间内，连续收到110kV DL变电站小电流接地故障选线保护装置关于GZ线及其XZ支线085D分支开关保护装置（FTU）上报的多条接地故障告警信息。调度中心工作人员根据告警信息，结合该线路走廊环境以及当时的大风天气，判断为树枝频繁短时间接触XZ支线造成的接地故障，估计因接地时间较短，接地保护未跳闸。随即安排运维人员直接赶往“事发现场”，迅速在现场确认085D分支开关下游300米处有明显的树枝灼烧痕迹，符合多次故障告警信息的特征。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="524x674" data-size="524x674" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161452142.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_334,h_429,limit_0" alt = "图片2.png" title ="图片2.png" 
                      width="334"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161452142.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161452142.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><span style="font-size: 18px;"><strong>二、“案发”过程</strong></span></p><p style="text-indent: 2em; line-height: 2em;"><strong>01.变电站小电流接地故障选线保护装置告警</strong></p><p style="text-indent: 2em; line-height: 2em;">2019年7月10日下午13时许，TA供电公司调度供服中心收到该公司下辖的110kV DL变电站小电流接地故障选线保护装置的多条接地故障告警信息，选线结果为10kV GZ线。</p><p style="text-indent: 2em; line-height: 2em;">工作人员调取110kV DL变电站小电流接地故障选线保护装置的接地故障选线记录，可以看到，7月10日下午13时许，在短时间内监测到多次接地故障，约50分钟后故障恢复。</p><p><br/></p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="800x495" data-size="800x495" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161454302.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_553,h_342,limit_0" alt = "图片3.png" title ="图片3.png" 
                      width="553"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161454302.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161454302.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="text-indent: 2em; line-height: 2em;">小电流接地故障选线保护装置设置的告警延时时间为3s、保护跳闸延时为14s。该时段选线装置总共记录到超过30次GZ线接地故障，其中8次故障持续时间超过3s而未达到保护跳闸延时时限，仅将告警信息通过综自系统上报调度供服中心，其他不超过3s的故障记录仅在装置内保存，未上报调度供服中心。</p><p><br/></p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="800x490" data-size="800x490" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161457413.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_556,h_340,limit_0" alt = "图片4.png" title ="图片4.png" 
                      width="556"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161457413.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161457413.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="text-indent: 2em; line-height: 2em;">分析故障录波可以看出本次故障为典型的高阻接地故障，且为不稳定的电弧故障，接地故障过渡电阻最小时约800欧姆，部分间歇性电弧时过渡电阻为数千欧姆。该线路大部分途经村民种植的林区，树木生长茂盛，线路维护工作复杂。根据录波与线路环境初步判断为树线矛盾造成的高阻间歇性电弧故障。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="768x659" data-size="768x659" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161458802.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_544,h_466,limit_0" alt = "图片5.png" title ="图片5.png" 
                      width="544"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161458802.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161458802.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="text-indent: 2em; line-height: 2em;"><strong>02.线路小电流接地故障保护装置告警</strong></p><p style="text-indent: 2em; line-height: 2em;">查阅调度供服中心故障记录信息，调度供服中心在7月10日下午13时许接到变电站小电流接地故障保护装置关于GZ线接地告警的同时，收到GZ线XZ支线085D分支开关接地保护装置（FTU）上报的多条接地故障告警信息。调取XZ支线085D分支开关接地保护装置记录，确认装置该时段检测到多次接地故障，由于各次故障电弧自行熄灭，持续时间低于配置的保护动作延时时限11s未跳闸。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="800x354" data-size="800x354" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161459420.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_593,h_262,limit_0" alt = "图片6.png" title ="图片6.png" 
                      width="593"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161459420.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161459420.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="text-indent: 2em; line-height: 2em;">由于同一时段该线路其它分支线并无接地故障信息，根据接地故障多级暂态方向保护的工作原理确定为GZ线XZ支线085D分支开关下游发生单相接地故障。结合当时该区域大风天气，判断为树枝频繁短时间接触XZ支线造成的高阻接地故障。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><span style="font-size: 18px;"><strong>三、“案发”现场</strong></span></p><p style="text-indent: 2em; line-height: 2em;">调度供服中心根据收到的故障信息及判断结果，将巡线范围由原来的10kV GZ线全线缩小至XZ支线085D分支开关下游的较小范围，安排运维人员直接前往该具体区域巡查，迅速在现场确认085D分支开关下游300米处有明显的树枝灼烧痕迹，故障类型符合本次故障录波的特征。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="800x600" data-size="800x600" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161501167.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_581,h_435,limit_0" alt = "图片7.png" title ="图片7.png" 
                      width="581"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161501167.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161501167.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="text-indent: 2em; line-height: 2em;">运行人员确认故障点后，立即组织了该区域线路环境综合治理，做到了线路隐患快速定位查找和排除，保证了供电安全和供电可靠性。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="524x509" data-size="524x509" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161504652.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_502,h_487,limit_0" alt = "图片8.png" title ="图片8.png" 
                      width="502"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161504652.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161504652.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><span style="font-size: 18px;"><strong>四、“案件”总结</strong></span></p><p style="text-indent: 2em; line-height: 2em;">小电流接地故障多级暂态方向保护根据线路开关属性（位置）配置阶梯动作时限，实现小电流接地故障快速定位与保护动作的选择性，不需要通信与主站配合，简单、可靠。既解决了瞬时性接地故障直接跳闸导致的供电可靠性问题，又避免了永久性接地故障带来的人身触电和电气火灾的风险。此外，暂态方向保护原理不受检测点下游电容电流和接地点过渡电阻的影响，灵敏度高，是配电网小电流接地故障快速定位处置的有效手段。</p><p><br/></p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="800x435" data-size="800x435" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161505231.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_569,h_309,limit_0" alt = "图片9.png" title ="图片9.png" 
                      width="569"  
                      data-src = "https://img.bjyyb.net/sites/64000/64123/20211026161505231.png@!jw1200"
                      data-webp = "https://img.bjyyb.net/sites/64000/64123/20211026161505231.webp?x-oss-process=image/resize,m_lfit,w_1200/quality,q_75"  
                /></a></p><p style="text-indent: 2em; line-height: 2em;">本“案”中，10kV GZ线路为小电流接地故障多发区段，线路走廊部分穿越5A级景区的山林，碰树故障多间歇性燃弧，极易引发山林火灾，危害极大。过去对于此类故障需要运维人员长时间带故障巡线，耗费大量人力物力，由于环境复杂，部分故障无法确定故障位置，导致隐患长期存在。在该起典型间歇性电弧接地故障处理过程中，变电站小电流接地故障选线保护装置与线路接地保护（FTU）通过暂态方向保护时间级差配合，准确定位了接地故障区段，大大缩短了运维人员的巡线时间，根据巡查结果即刻进行了线路环境治理，避免了永久性接地故障的发生和山林电气火灾的风险。</p><p style="line-height: 2em; text-indent: 0em; text-align: center;"><a data-gallery="1" data-med-size="770x502" data-size="770x502" data-med="https://img.bjyyb.net/sites/64000/64123/20211026161507510.png@!jw800"><img class="lazyload"
                      src="https://img.bjyyb.net/grey.png?x-oss-process=image/resize,m_fixed,w_567,h_369,limit_0" alt = "图片10.png" title ="图片10.png" 
                      width="567"  
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