列頭柜是一列機(jī)柜設(shè)備比較頂端的一個(gè)機(jī)柜。通常在比較前端的叫列頭柜，比較末端的叫列尾柜，主要功能是對(duì)這一列柜的交流或者直接負(fù)載提供電源，起到配電，監(jiān)控，測(cè)量、保護(hù)、告警等功能。列頭柜類似于柜式的配電箱，里面集中了很多斷路器。接下來介紹一下列頭柜的主要作用及使用原理。
什么是列頭柜？
列頭柜是一列機(jī)柜設(shè)備比較頂端的一個(gè)機(jī)柜。通常在比較前端的叫列頭柜，比較末端的叫列尾柜，主要功能是對(duì)這一列柜的交流或者直接負(fù)載提供電源，起到配電，監(jiān)控，測(cè)量、保護(hù)、告警等功能。列頭柜類似于柜式的配電箱，里面集中了很多斷路器電源分配列柜簡(jiǎn)稱列頭柜，而列頭柜又分為普通列頭柜和精密列頭柜。普通列頭柜主要用于通信機(jī)房及站傳輸設(shè)備機(jī)房，安裝在設(shè)備的列頭和列尾，與條形架通信機(jī)列、光端機(jī)列等配套,通過本設(shè)備中的配電裝置，為通信設(shè)備進(jìn)行電源配。
精密列頭柜是機(jī)房配電在整個(gè)機(jī)房中起到至關(guān)重要的一環(huán)，但是也是很容易被忽視的一關(guān)，現(xiàn)在的機(jī)房設(shè)備服務(wù)器、空調(diào)、UPS、風(fēng)機(jī)等都已經(jīng)做到了隨時(shí)可以監(jiān)控的這一步，而機(jī)房配電的監(jiān)控恰恰是一個(gè)空白，傳統(tǒng)的配電柜也只是幾個(gè)表頭加上幾路所需的開關(guān)而已，即使做動(dòng)環(huán)監(jiān)控也只是在配電柜里進(jìn)行二次改造增加各種模塊。這樣既繁瑣而且效果也不大。
機(jī)房配電回路一般是雙路市電接入，首先進(jìn)市電配電箱，一部分給UPS，一部分給空調(diào)和照明、普通插座，UPS下端再進(jìn)UPS配電柜，分配到各個(gè)列頭柜，經(jīng)列頭柜后接入各機(jī)柜PDU再到負(fù)載。
列頭柜電源進(jìn)線一般選用雙電源進(jìn)線，當(dāng)一路電源系統(tǒng)故障斷電時(shí)，另一路電源自動(dòng)投入以保證供電連續(xù)性。為實(shí)現(xiàn)短路、過載保護(hù)，在雙電源前使用塑殼斷路器，提供短路、過載保護(hù)，還具備隔離功能，方便檢修。箱內(nèi)一般需設(shè)置電氣火災(zāi)監(jiān)控系統(tǒng)，電氣火災(zāi)探測(cè)器和監(jiān)控單元。由于機(jī)房設(shè)備對(duì)雷擊非常敏感，所以一般要選配浪涌保護(hù)器。
列頭柜的主要出線回路可以選擇塑殼斷路器，如果有需要，可以加裝漏電模塊。機(jī)房設(shè)備的供電連續(xù)性非常重要，列頭柜進(jìn)線處配置有電力參數(shù)測(cè)量?jī)x，能實(shí)時(shí)監(jiān)視電氣參數(shù)水平，及時(shí)發(fā)送故障報(bào)警信號(hào)，提前發(fā)現(xiàn)潛在的故障隱患，同時(shí)監(jiān)視用電能耗水平。
列頭柜柜內(nèi)可按需選配配電模塊，模塊化結(jié)構(gòu)便于拆裝、維護(hù)，模塊允許用戶快速、靈活的增加和刪減回路，滿足機(jī)房用電量的擴(kuò)容需求
The header cabinet is a cabinet at the top of a list of cabinet equipment. Usually at the front end of the column, called the column end cabinet, the main function is to provide power to the exchange or direct load of this column cabinet, to play the functions of distribution, monitoring, measurement, protection, warning and other functions. The column cabinet is similar to the cabinet type distribution box, which contains many circuit breakers. Next, the main function and operating principle of the following head cabinets are introduced.
What's the stand?
The header cabinet is a cabinet at the top of a list of cabinet equipment. Usually at the front end of the column, called the column end cabinet, the main function is to provide power to the exchange or direct load of this column cabinet, to play the functions of distribution, monitoring, measurement, protection, warning and other functions. The column head cabinet is similar to the cabinet type distribution box. There are many circuit breaker power distribution cabinets referred to as the column head cabinet, and the column head cabinet is divided into ordinary column head cabinets and precision column head cabinets. The general column cabinet is mainly used in the communication room and station transmission equipment room. It is installed in the column head and column tail of the equipment, and is matched with the bar frame communication column and optical end column, etc., and is used as a power supply for the communication equipment through the distribution device in the equipment..
Precision column cabinets are a crucial part of the distribution of computer rooms in the entire computer room, but they are also easily overlooked. The current computer room equipment servers, air conditioners, UPS, and fans have all been able to monitor at any time. This step, The computer room distribution monitoring is a blank, the traditional power distribution cabinet is only a few table heads plus a few required switches, even if the control ring is only in the distribution cabinet to carry out secondary modifications to add various modules. This is cumbersome and ineffective.
The distribution circuit of the computer room is generally a two-way city power access, the first advanced city power distribution box, part to UPS, part to air conditioning and lighting, ordinary socket, UPS lower end then into the UPS distribution cabinet, assigned to each column cabinet. After passing through the header cabinet, connect to each cabinet PDU and then to the load.
The power feed line of the column cabinet generally uses a double power feed line. When the power supply system fails and the power supply is cut off, the other power supply is automatically put into the power supply to ensure the continuity of the power supply. In order to achieve short circuit and overload protection, plastic shell circuit breakers are used in front of double power supplies, short circuit and overload protection are provided, and isolation functions are also provided to facilitate maintenance. Generally, electrical fire monitoring system, electrical fire detector and monitoring unit should be installed in the box. Because the computer room equipment is very sensitive to lightning strikes, it is generally necessary to select surge protectors.
The main outlet circuit of the column cabinet can select the plastic shell circuit breaker, and if necessary, it can be equipped with a leakage module. The power supply continuity of the equipment in the computer room is very important. The power parameter measuring instrument is deployed at the entry line of the column cabinet. It can monitor the level of electrical parameters in real time, send fault warning signals in time, detect potential potential failures in advance, and monitor the energy consumption level at the same time.
The module allows the user to quickly and flexibly increase and reduce the circuit to meet the power consumption expansion requirements of the computer room.
