供配电系统
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供配电系统及设备概述1. 引言供配电系统及设备是电力系统中一个重要的组成部分,负责将发电厂生成的电能输送到各个用户,同时保证供电的稳定性和安全性。
本文将对供配电系统及其主要设备进行概述,介绍其基本原理和功能。
2. 供配电系统概述供配电系统是将发电厂的输电系统与用户的配电系统相连接的电力网络。
它包括三个主要部分:发电系统、输电系统和配电系统。
2.1 发电系统发电系统是由一台或多台发电机组成的系统,它将机械能转化为电能。
常见的发电机包括燃气轮机、蒸汽轮机和水轮机等。
发电系统一般分为高压发电系统和低压发电系统,其中高压发电系统主要用于将电能输送到变电站。
2.2 输电系统输电系统是将发电厂产生的电能通过高压输电线路输送到各个变电站的系统。
输电系统一般采用高压电缆或架空输电线路进行输电。
高压输电线路常见的有220kV、500kV等不同电压等级,以满足不同距离和功率的输送要求。
2.3 配电系统配电系统是将从变电站输送过来的电能进行分配,最终供应给各个用户的系统。
配电系统通常包括变电站、配电变压器、配电线路等设备。
根据供电范围的不同,配电系统可以分为高压配电系统和低压配电系统。
3. 主要设备概述供配电系统涉及到多种设备,下面将简要介绍几种主要设备的基本原理和功能。
3.1 变电站变电站是连接输电系统和配电系统的重要环节,主要功能是将输电系统提供的高压电能转变为适用于配电系统的低压电能。
变电站通常包括变压器、断路器、隔离开关等设备。
3.2 配电变压器配电变压器用于将变电站输送过来的高压电能转变为适用于用户的低压电能。
它具有降压、隔离和稳压的功能,保证电能正常供应给用户。
3.3 配电线路配电线路将从配电变压器输出的低压电能输送到用户。
配电线路一般采用铜线或铝线制成,根据功率的不同,可以分为主干线和支线,以满足不同用户的用电需求。
3.4 断路器与隔离开关断路器和隔离开关是保护供配电系统安全运行的重要设备。
断路器主要用于在电路中发生过载或短路时自动切断电路,防止电气事故的发生;隔离开关用于切断供电系统与用户设备之间的电气连接,以便进行维修和检修工作。
供配电系统介绍供配电系统是指用于将电源能量输送到各个用户终端的系统。
它包括了从电源站到用户的输电网络以及在用户端的配电设备。
供配电系统的稳定运行对于现代社会的正常运转至关重要。
本文将首先介绍供配电系统的基本结构和组成,然后详细讨论其各个部分的功能和特点。
结构和组成供配电系统由以下几个部分组成:1.电源站:电源站是供电系统的起始点,它接收来自发电厂的电能,并通过变压器将电压升高以适应输电的需求。
2.输电线路:输电线路负责将电能从电源站输送到各个用户终端。
根据输电的距离和负载容量的不同,输电线路可以分为高压输电线路和低压输电线路。
3.变电站:变电站位于输电线路上,负责将输送的电能进行变压处理,以适应用户终端的需要。
变电站通常还具有保护和监控功能,以确保供电的安全和可靠。
4.配电网络:配电网络是将电能从变电站输送到各个用户终端的网络。
它包括了配电变压器、配电线路和配电设备等组成部分。
5.用户终端:用户终端是供配电系统的最后一环,它将电能供给各个家庭、工业、商业和公共设施等用户。
用户终端通常包括了电表、开关、插座和照明设备等。
功能和特点供配电系统有以下几个主要功能和特点:1.供电稳定性:供配电系统需要保证稳定的电压和频率,以满足用户终端的需求。
为了实现这一点,供配电系统采用了多种措施,如电力调度、电压调节和冗余设计等。
2.远距离输电:供配电系统需要将电能从电源站输送到远离发电厂的用户终端。
为了减小输电过程中的能量损耗,供配电系统采用了高压输电线路和变压器等设备,以降低输电线路的比例材料及绝缘材料需求。
3.安全可靠性:供配电系统需要保证供电的安全和可靠。
为了实现这一点,供配电系统采用了多重保护措施,如过压保护、过流保护和短路保护等。
而配电设备通常还具有自动开关和远程监控等功能,以快速定位和排除故障。
4.节能环保:供配电系统需要考虑能源的消耗和环境的影响。
为了减少能量损耗,供配电系统采用了高效的变压器和输电线路。
供配电系统一、简介供配电系统是现代工业生产和民用电力供应的重要组成部分。
它主要包括电源、配电设备和配电线路等组成部分,用于将电能从电源供应到各个用电设备上。
本文将对供配电系统的构成、工作原理以及常见问题进行详细介绍。
二、供配电系统的组成供配电系统包括电源、配电设备和配电线路等几个主要组成部分。
1. 电源:电源是供电系统的起始点,通常可分为传统电网电源和独立发电电源两种。
传统电网电源指的是从电力公司供应的电能,通常采用交流电。
独立发电电源则是通过发电机、太阳能光电池、风能发电等方式独立产生电能。
2. 配电设备:配电设备主要包括变压器、开关设备和保护设备等。
变压器用于将电能从高压电网变换为适用于不同用电设备的电压,开关设备用于控制电能的传送和断开,保护设备则用于保护电网和用电设备的安全运行。
3. 配电线路:配电线路是将电能从电源传送到各个用电设备的介质。
它通常包括输电线路、变电站配电线路和低压配电线路等。
输电线路主要用于将电能从电源输出到变电站,变电站配电线路将电能从变电站传送到不同区域的配电线路,低压配电线路将电能从配电线路分配到各个用电设备。
三、供配电系统的工作原理供配电系统的工作原理可以简单描述为以下几个步骤:1. 供电:电能从电源供应到供配电系统的起始点。
2. 变换:电能经过变压器等设备进行适当的电压变换,以满足不同用电设备的电压要求。
3. 分配:电能通过输电线路、变电站配电线路和低压配电线路等逐级分配到各个用电设备。
4. 控制:通过开关设备控制电能的传送和断开,以实现对供配电系统的有效控制。
5. 保护:配电设备通过保护设备对供配电系统和用电设备进行保护,防止电力故障对安全和设备运行造成影响。
四、供配电系统常见问题及解决方法在供配电系统的使用过程中,常常会出现一些问题,如电力故障、线路过载、设备老化等。
以下是一些常见问题及解决方法的简要介绍:1. 电力故障:电力故障可能由于供电线路断开、设备故障等原因造成。
第四章供配电系统1. 概述供配电系统是指电力系统中负责电能供应和配电的电力系统,包括电源、馈线、变电、配电与用电,对于建筑物内部的供电、照明和动力等均有至关重要的作用。
在现代建筑设计中,供配电系统设计尤为重要,因此本文将对供配电系统的设计及应用进行深入探究。
2. 供配电系统的构成供配电系统是由如下四个部分组成:2.1 电源系统电源系统主要由供电变压器、母线、断路器、保险丝等组成。
供电变压器将高压电缆通过变压器变为低压电缆供电,母线作为电源的接口,将电能分配给馈线和用电设备,断路器和保险丝则主要用于保护电路。
2.2 馈线系统馈线系统是指连接电源系统和变电系统之间的电缆,包括高压线、中压线和低压线,其中高压线主要用于长距离输送电能,而中压和低压线主要用于短距离输送电能。
2.3 变电系统变电系统是将电能从高压线输送到建筑物内部的电缆,包括变电站、变压器、电缆等。
变电站主要负责将高压线变成中压或低压线并且将电能传送到建筑物内部的电缆上。
变压器则负责将电能从高压电缆中传输出来,使其通过电缆变为低压线供应给建筑物内部的用电设备。
2.4 配电系统配电系统是将电能从变电系统传输到建筑物内部的电缆,包括低压配电系统和照明配电系统。
低压配电系统主要为建筑物内主要用电设备供电,例如电梯、冷却水系统等等。
照明配电系统主要为建筑物内的照明设备供电。
3. 供配电系统的设计供配电系统的设计要考虑很多因素,例如供电方式、电流承受能力、电缆长度等等。
通常会按照如下步骤进行设计:3.1 确定用电负荷在进行供配电系统的设计时,首先需要确定用电负荷的大小,这将有助于决定所需配电系统的容量大小和能力。
3.2 确定供电方式供电方式分为两种:直接供电和间接供电,直接供电是指电源直接通过电缆供电给建筑物内的设备,间接供电是指电源通过变压器、母线、断路器等设备间接供电。
3.3 计算电缆长度电缆长度是供配电系统设计中较为关键的因素之一,因为它将直接影响到供电效率和稳定性。
POWER SUPPLY AND DISTRIBUTION SYSTEM1. Composition of the distribution network systemIt is composed of total step-down substation, high voltage distribution line, substation, low-voltage distribution line and electrical equipment.Total step-down substation: substation is the transformer output voltage below the input voltage.High voltage distribution line: power transmission refers to the voltage level above 35kVDistribution refers to the voltage level of 220V to 10kV and sometimes 35kV Electricity distribution means to distribute electricity to usersThe power distribution from 110kV (or 35kV) substation is reduced to 10kV distribution line, and the transformer is converted to 220V at the user's level to be used by users.Due to 10 kv line after the user space, in order to ensure the conductor is not with the surrounding trees, buildings, so often used insulated conductor, high voltage class and transmission line, transmission distance, more than in the high mountain with tower erection, all use bare wires.Because power distribution is to distribute power to different users, it is necessary to use the branch box, while transmission line is transported directly from one substation to another substation, and there is no branch box.Some distribution lines take underground cables, while transmission lines are all overhead lines.Substation (substation), as the name implies, is the place where voltage is changed.It is the place where the voltage and current of the power system are transformed, concentrated and distributed.In order to guarantee the electrical energy quality and the safety of equipment, still need to adjust voltage in the substation, tide (in the power system voltage, current and power of each node and branch) flow and distribution of the control and power transmission and distribution lines and the protection of the main electrical equipment.The utility can be divided into power substation and traction substation (electric railway and trolley).In the national standard GB 50053-50053 "under 10 kv substation design specification" which sets the term is defined as "10 kv and below the ac power for electric power equipment after a power transformer transformer", in accordance with the substation.The revolution of electric power system has brought a new big round construction,which is pushing the greater revolution of electric power technique along with the application of new technique and advanced equipment. Especially, the combination of the in formation technique and electric power technique, to great ex- tent, has improved reliability on electric quality and electric supply. The technical development decreases the cost on electric construction and drives innovation of electric network. On the basis of national and internatio- nal advanced electric knowledge, the dissertation introduces the research hotspot for present electric power sy- etem as following.Firstly, This dissertation introduces the building condition of distributionautomation(DA), and brings forward two typical construction modes on DA construction, integrative mode and fission mode .It emphasize the DA structure under the condition of the fission mode and presents the system configuration, the main station scheme, the feeder scheme, the optimized communication scheme etc., which is for DA research reference.Secondly, as for the (DA) trouble measurement, position, isolation and resume, This dissertation analyzes the changes of pressure and current for line problem, gets math equation by educing phase short circuit and problem position under the condition of single-phase and works out equation and several parameter s U& , s I& and e I& table on problem . It brings out optimized isolation and resume plan, realizes auto isolation and network reconstruction, reduces the power off range and time and improves the reliability of electric power supply through problem self- diagnoses and self-analysis. It also introduces software flow and use for problem judgement and sets a model on network reconstruction and computer flow.Thirdly, electricity system state is estimated to be one of the key techniques in DA realization. The dissertation recommends the resolvent of bad measurement data and structure mistake on the ground of describing state estimate way. It also advances a practical test and judging way on topology mistake in state estimate about bad data test and abnormity in state estimate as well as the problem and effect on bad data from state measure to state estimate .As for real time monitor and control problem, the dissertation introduces a new way to solve them by electricity break and exceptional analysis, and the way has been tested in Weifang DA.Fourthly, about the difficulty for building the model of load forecasting, big parameter scatter limit and something concerned, the dissertation introduces some parameters, eg. weather factor, date type and social environment effect based on analysis of routine load forecasting and means. It presents the way for electricity load forecasting founded on neural network(ANN),which has been tes ted it’s validity by example and made to be good practical effect.Fifthly, concerning the lack of concordant wave on preve nting concordant wave and non-power compensation and non-continuity on compensation, there is a topology structure of PWM main circuit and nonpower theory on active filter the waves technique and builds flat proof on the ground of Saber Designer and proves to be practical. Meanwhile, it analyzes and designs the way of non-power need of electric network tre- nds and decreasing line loss combined with DA, which have been tested its objective economic benefit throu- gh counting example.Sixthly, not only do the dissertation design a way founded on the magrginal electric price fitted to our present national electric power market with regards to future trends of electric power market in China and fair trade under the government surveillance, that is group competitio n in short-term trade under the way of grouped price and quantity harmony, but also puts forward combination arithmetic, math model of trading plan and safty economical restriction. It can solve the original contradiction between medium and long term contract price and short term competitive price with improvement on competitive percentage and cut down theunfair income difference of electric factory, at the same time, it can optimize the electric limit for all electric factories and reduce the total purchase charge of electric power from burthen curve of whole electric market network.2. Power system voltage level and substation typeThe voltage level of the power system is 220/380v (0.4kv), 3 kV, 6 kV, 10 kV, 20 kV, 35 kV, 66 kV, 110 kV, 220 kV, 330 kV, 500 kV.With the improvement of the manufacturing process of the motor, the 10 kV motor has been mass-produced, so 3 kV and 6 kV are less used, and 20 kV and 66 kV are also rarely used.The power supply system is based on 10 kV and 35 kV.The transmission and distribution system is based on 110 kV.The power plant generator has 6 kV and 10 kV, and now it is based on 10 kV and the user is 220/380v (0.4kv) low pressure system.In accordance with the urban power network design rules "regulation: the grid for 500 kV, 330 kV, 220 kV, 110 kV, the high voltage power distribution lines of 110 kV, 66 kV, medium voltage distribution network of 20 kV, 10 kV and 6 kV, low voltage power distribution network is 0.4 kV (220 v / 380 v).Issue 6 kV and 10 kV electric power plant, in addition to power plant oneself use (apc), 10 kV voltage can also be used to power plant near the users, including 10 kV power supply range of 35 kV, 10 km, is 20 ~ 50 km, 66 kV is 30 ~ 100 km, 110 kV is 50 ~ 150 km, 150 kV to 100 kV ~ 300 km, 300 to 330 ~ 600 km, 500 kV to 600 ~ 850 km.All kinds of power system voltage level transformation through power transformer, voltage rise for the step-up transformer (transformer substation for booster station), reduced to step-down voltage transformer (transformer substation of step-down station).A double coil transformer with two coils (winding) of a voltage to another voltage, and a three-coil transformer of three coils (windings) of two voltages.In addition to lifting and lowering of the substation, the substation is divided into hub stations, regional stations and terminal stations.The voltage level of the hub station is generally three (three-ring transformer), 550kV /220kV / 110kV.The regional stations generally have three voltage levels (three ring transformers), 220 kV /110kV /35kV or 110kV /35kV / 10kV.The terminal station is usually directly received by the user, most of which are two voltage grade (two ring transformer) 110kV /10 kV or 35 kV /10 kV.The user's own substation generally has only two voltage grades (double coil transformer) 110 kV / 10kV, 35kV / 0.4kv, 10kV / 0.4kv, of which 10kV / 0.4kv is the most.3 preventive measures of the distribution network system1. Leakage of fire hazards and causes of leakageAfter electrical wiring or equipment insulation damage, in certain circumstances, to close to the material (threading tube metal shell, electrical device, wet wood, etc.) will happen leakage, make the local material charged, cause serious and even fatal electric shock to people, a spark, arc, such as high temperature overheating and cause a fire. Leakage occurs when the electrical equipment which touch the shell when short circuit, current to connect equipment shell, protecting the zero line (protectiveearthing line), zero line (earth) to form a closed loop, the leakage current will be very big, often can make fuse action and cut off power supply.But because of many reasons, such as fuse specifications may be artificially increase several times or replaced by copper wire, grounding device is not in conformity with the requirements of grounding resistance is bigger, grounding line terminal connection, protection device failure or set unreasonable, etc.) can make the over current protection device don't over-current protection function, so that once the leakage occurs, will continue to exist, result in electric shock or electric fire accident, many leakage fire cases also proves this point.There are many factors that cause leakage, which can be summarized as follows: (1) the installation of low voltage power distribution system is the electrical professionals, quality is uneven, difficult to guarantee quality, displays in: wet or have acid and alkali corrosive environment, Ming fu, wire equipment did not protect the direct installation, wiring, knife, pliers, hammer damage such as insulating layer;The non-standard phenomenon of quality of wire joint connection and quality of insulation and rolling quality is not in conformity with the requirements.(2) the electrical wiring or equipment is neglected for inspection, and the reason of the insulation deterioration due to overloads or longer service life;(3) choosing fake and shoddy electrical products;(4) external factors: water immersion, extrusion, rat bite, etc.2. Leakage causes fire(1) leakage current causes fire.The leakage point of leakage is usually not real, and the contact resistance is very high, which causes the contact resistance to be large, which makes it difficult to move the current protection device, and also produces an electric arc at the point of failure.According to the survey, only 0.5 A current of arc temperature can exceed 2000 ℃ above, all enough to ignite fuel.(2) the connection between protection of the zero line or the connecting terminal of the protection ground line is not real, causing the fire.Phase line and zero line terminal connections are not real, the operation of the equipment can be found in a timely manner, protect the zero or ground terminal connection untrue, resistance is too big, the equipment work as usual, fault point is difficult to be found.Once leakage, due to the fault point joint is too loose or corrosion, etc., the presence of high resistance, cause local overheating, terminals at high temperature or electric arc, can spark around flammable substances, or burn out electrical socket and switch, ignition wooden base, this is the more common forms of residual current fire.In July 2000, a fire in a hotel in hangzhou was a case of fire. Before the fire, the restaurant closed and the load was in a low ebb.At the time of the fire, lighting was still normal.The total air switch in the distribution box is seriously carbonized, and the protection of the zero wire terminal has a metal concave shape, which is consistent with the leakage.(3) fire caused by leakage voltage.After leakage continues, because the current cannot diaspora, and guide to find the other one road leads to resistance, zero line (ground) along the protection take conduction that all connected with the metal shell of the electric devices with the voltage, then can to nearby low potential of warm water pipe, gas pipe and other metal components flash-over become fire origin, 20 v voltagealone can make the arc occurs continuously, can also be ignited fuel around.If an arc is to the gas, it may break through the wall, causing a gas leak to cause a fire.It is necessary to note that the leakage point is not necessarily consistent with the fire point due to the conduction of the voltage.(4) to protect the line diameter of the zero line or to protect the ground wire, if the selection is too small, the line will rise faster when passing the larger leakage current, which can also cause the fire.3. Prevention measures of leakage fire3.1 strengthen the management of electrical workersTo establish and improve electrical operation procedures, all electrical practitioners must learn to master these operating procedures, and non-electrical professionals are not allowed to work.In order to strengthen the training of electrical workers, organize training courses regularly, improve the technical and safety awareness of electrical workers, and eliminate the human factors causing the fire.Take necessary technical protection measures(1) install the leakage protector.Current low-voltage distribution system in the protection of the zero and overcurrent protection devices and other measures can't effectively prevent the occurrence of leakage fire, therefore, in the current building the into the line should be set dedicated to fire prevention of the leakage protector.To prevent blackouts in power distribution box and switch box customers should set up the leakage protector, rated its rated current action and action time should be reasonable to cooperate, make it has the function of graded protection.(2) reasonable selection of protection of zero (protective grounding line) and the design of grounding resistance.The selection of the cross-sectional area of the protection of the zero and the protection of the ground wire must be calculated and verified with the short circuit current of the shell.Its terminals must be securely connected, not allowed to be loose, and check its connection quality frequently.Electrical equipment protective earthing resistance value should not be more than 4 Ω, such as the capacity of electrical equipment is larger, the melt fuse current is bigger also, should increase the grounding line cross section or parallel body to fully decrease grounding resistance, increase the leakage short-circuit current, thus is advantageous to the protective device.(3) carry out equipotential connections.Leakage protector for single-phase 220 v circuit provides only indirect contact protection, at the same time there are for parts wear short life, poor contact, quality instability caused by factors such as action failure of pitfalls, couldn't become a reliable protection, so is the equipotential connection should be implemented, can effectively eliminate the leakage of electric circuit or device with low potential metal components between the generation of electric arc and spark, which eliminate the leakage voltage may cause fire.Equipotential connection refers to the protection by zero bus and the structure of the water main, total gas pipe, hvac duct device such as a metal pipe or use wire connection measures, to achieve the purpose of equilibrium potential within a building, especially for flammable and explosive place more has its irreplaceable role.3.3 strengthen the audit of electrical design.For building power distribution system,the relevant departments should be on the electrical design review on strictly according to the related technology, for building interior decoration engineering must be strictly implemented the code for fire protection design of building interior decoration, use less as far as possible need not or flammable combustible material, especially in the electrical wiring through fuel, flame retardant should wear metal or hard plastic tube protection, because the plastic insulation performance is good, so it can well prevent leakage, using metal wiring, must prevent the insulating layer is broken.Power distribution devices (switches, sockets, distribution boxes, etc.) and electric equipment and combustible materials should be kept safe and distance, which are indeed inseparable, should be protected from heat protection measures.After the completion of the construction project, its electrical installation shall be put into use after being tested by a special testing institution, and the occurrence of leakage fire can be eliminated from the source as far as possible.4 Development of power distribution system1. Development status of voltage distribution systemWith the rapid development of modern industrial technology, the low-voltage distribution system in people for operational reliability and the requirements of the intelligent management is becoming more and more high, with the improvement of the computer system reliability, and the application of a slightly processor technology, made in the electric power system, a lot of intelligent low-voltage electric elements obtained rapid development, which appeared in the intelligent low-voltage distribution system, at present in our country there are a lot of low voltage intelligent monitoring system is based on traditional SCADA system transformation, although it can satisfy the basic monitoring function, but not the electrical system fully reflected its own characteristics and requirements, the development and launch of meet the demand of industrial control and have high reliability in the low-voltage distribution system gradually become the primary task of low voltage electrical equipment manufacturing sector.Although this kind of intelligent low-voltage distribution system has been widely applied at present, but because its price is quite high, the main application in the following aspects: first, the hair distribution system such as substation and power plant;Second, some important industrial fields, such as mining, automobile manufacturing, petrochemical and steel, etc.Third, some infrastructure such as subway, terminal or airport;Fourth, some large commercial buildings, such as high-rise buildings, smart buildings and superstores.At present the system has been widely used in these projects, the amount is relatively large, especially in recent years, along with our country economy and the rapid growth of demand in the low-voltage distribution system, the products are all imported products, at the same time, the dosage of the will be more and more big, in the future in power system, intelligent low-voltage distribution system will become the main development trend of power system.In addition, in low voltage complete sets of equipment in our country, its intelligent power distribution system also started gradually, such as xiamen electric control equipment factory has successfully developed to implement data acquisition, motorcontrol center in tianjin xiali car project, the application of the power cabinet and low voltage power distribution cabinet have realized computer control, centralized monitoring system and the running status of equipment and all its faults, but in terms of technology, although our country has already mastered the microprocessor in the electronic products of all kinds of application technology, there are also some new type of digital products, but can reflect the level of intelligent controller and intelligent low-voltage distribution equipment is less, the need to strengthen the research and exploration.Ii. Future development trend of medium and low voltage distribution systemIn the intelligent low-voltage distribution system can collect real-time data, remote operation and program control, all kinds of statements and equipment maintenance information management, fault analysis, protection, digital communication and the event log and alarm and other functions.Because of the low voltage power distribution system directly to the controlling terminal, the required equipment is more and more widely distributed, at the same time in the field condition by more complex and so on, in the future development, can intelligent low-voltage distribution system should be implemented in the object-oriented operating mode, must have strong anti-interference ability.In this system, its main control functions are completed by intelligent elements in the equipment layer, gradually formed to a network integrated distribution control system, all of them, and can satisfy the system running reliability, real-time and fast requirements, in the low-voltage distribution system in intelligent low-voltage intelligent component in terms of its function, which can be roughly divided into the following kinds: switch the protection and control, motor control, and power quality monitoring, etc.(I) the necessity of realizing intelligence and automation of low-voltage power distribution system1. Meet the requirements of national economic development and improve the quality of life of people.In modern society, the quality of power supply not only reflects a country or region's economic development and people's living quality and level, but also with an important factor affecting the development of its economy.Which the intellectualization of low-voltage distribution system and automation level directly determines the size and direction of the development of the industry, only to realize low-voltage distribution system in intelligent and automation, can only be in the maximum extent, improve the quality of the power supply, to adapt to the demand of economic development and people's life and production requirements.2. Realizing the intelligent and automation of low-voltage power distribution system is one of the important ways for the development of electric enterprises.Implementation of low-voltage distribution system in intelligent and automation, can effectively reduce the number of failure occurs, narrowing the scope of the accident and to shorten the time of the accident, for the power supply recovery and rapid analysis and report the cause of the accident to provide corresponding effective basis.At the same time also can improve the whole economic benefit of power system, improve the security and reliability of the equipment operation,effectively reduce the work intensity of maintenance personnel, to a great extent, can effectively prolong its service life.In addition, it is more convenient to monitor the power supply situation and the situation of the users, achieve overall control and provide more detailed and rich information for its management.3. The effective management to improve the low-voltage distribution system, demand for the load input to respond quickly, at the same time in the system can optimize the distribution of energy consumption, parking balanced load so as to reduce the potential of various events.According to the actual operation of each equipment in the system, the corresponding maintenance plan should be made according to the plan, so as to effectively reduce the cost of maintenance.In addition, but also potential accident forecasting warning, and take corresponding measures to prevent accidents, failure to reduce the loss, understand the relevant fault information at any time, effectively guide the maintenance work.Can through the way of report or graphics to the operation of various power distribution circuit in the display or a device in the system operation, and can be stored in the disk or print it out, to a great extent, improve the efficiency of its work.(ii) development trend of low-voltage distribution systemFrom the above content, we can know that the future low-voltage distribution system should be developed in the following aspects;First, the function is stronger, the system is more perfect and the reliability is higher, etc.Secondly, it is more flexible, easier to program and easier to control.Third, the openness of communications protocols is stronger.Implementation of automatic control and intelligent control, low voltage switchgear can be done through the following two ways: first, set in the surrounding of the switchgear several PLC remote terminal station, the various motor control circuit and the power distribution circuit state and direct electricity parameters collected in the PLC control machine for processing, through the PLC I/O points to realize the signal control.Second, in the traditional low voltage switchgear equipped with corresponding power data acquisition module, make it become a kind of intelligent switch cabinet, then pushes the data acquisition module unit reuse communication network in the PC for processing, but also accept computer control command, this method can effectively improve the reliability of switchgear and power distribution system, and its performance, etc.In switchgear intellectualization and automation control, because the many manufacturers products in our sample is relatively simple, the author suggested that may follow the same type products abroad samples to its WanZhengHua, if conditions permit, should adopt automatic switch cascade protection measures.5 conclusionTo sum up, with the progress of science and technology and the continuous development of social economy, at present our country adopted in low voltage power distribution system has yet to be further research and innovation, to improve the reliability of electricity at the same time, improve the quality of the power supply and the level of the enterprise itself, realize the low-voltage distribution system in the intelligent and automation, in the low-voltage distribution system more simple andreliable, convenient for people to its application, to enhance the reliability of system operation, improve the compatibility of low voltage products in network, make it meet the needs of businesses and individuals.References[1] Wencheng Su. 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