WO2022099796A1 - 一种10kv配网等效测试低压模拟系统及其模拟方法 - Google Patents

一种10kv配网等效测试低压模拟系统及其模拟方法 Download PDF

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WO2022099796A1
WO2022099796A1 PCT/CN2020/131727 CN2020131727W WO2022099796A1 WO 2022099796 A1 WO2022099796 A1 WO 2022099796A1 CN 2020131727 W CN2020131727 W CN 2020131727W WO 2022099796 A1 WO2022099796 A1 WO 2022099796A1
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voltage
low
simulation
distribution network
phase
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曾晓蕾
周辉
赵世钦
史纯清
关昕
徐懿
袁忠军
刘朝英
杨平安
岑荣佳
刘昌宏
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贵州电网有限责任公司
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    • G09B9/00—Simulators for teaching or training purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
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    • G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
    • G09B23/187—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for measuring instruments
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
    • G09B23/188—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for motors; for generators; for power supplies; for power distribution

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  • the invention relates to a 10KV distribution network equivalent test low-voltage simulation system and a simulation method thereof, belonging to the technical field of 10KV distribution network equivalent test low-voltage simulation.
  • the 10KV distribution network is a medium-voltage transmission network, due to the high voltage and large transmission power, various operation experiments are carried out directly on the line of this voltage level, which has disadvantages such as high technical difficulty and high risk.
  • the technical problem to be solved by the present invention is to provide a 10KV distribution network equivalent test low-voltage simulation system and a simulation method thereof, so as to solve the problems existing in the above-mentioned prior art.
  • a low-voltage simulation system for equivalent testing of 10KV distribution network including a system simulation power supply, a magnetic saturation isolation transformer, a simulation transmission line, a three-phase transformer and a distribution low-voltage load, the system simulation power supply and the output terminal are in sequence. It is connected with magnetic saturation isolation transformer, analog transmission line, three-phase transformer and distribution low-voltage load, and low-voltage 3-phase external circuit breaker switch and low-voltage circuit breaker are installed on the analog transmission line.
  • the simulation power supply of the above-mentioned system utilizes the low-voltage power distribution of the public power grid, and the AC220V three-phase four low-voltage power distribution.
  • the above-mentioned simulated transmission line adopts a 2.5 square millimeter multi-strand insulated wire.
  • the above-mentioned simulated transmission lines are 300 meters*3 for each outgoing line.
  • the above-mentioned magnetic saturation isolation transformer 3-phase AC voltage stabilizer Preferably, the above-mentioned magnetic saturation isolation transformer 3-phase AC voltage stabilizer.
  • a plurality of independent grounding points are provided in the test site.
  • the above-mentioned magnetic saturation isolation transformer uses a 1:1 magnetic saturation isolation transformer, with a Y-shaped input and a delta output.
  • a simulation method of a 10KV distribution network equivalent testing low-voltage simulation system is: using a magnetic saturation isolation transformer to convert a three-phase four-wire AC220V low-voltage power distribution into a three-phase three-wire low-voltage AC380V with a low-voltage neutral point that is not grounded
  • the power transmission system, the opening and closing of circuit breaker switches and low-voltage circuit breakers, realize the simulation of 10KV neutral point ungrounded distribution network transmission system.
  • the equivalent platform power supply uses three-phase four-wire 400V low-voltage power distribution, which is easy to erect and install;
  • Isolation transformer design is adopted, and the equivalent test platform is separated from the main network to avoid accidental electric shock caused by platform testers.
  • Figure 1 is the design schematic diagram of AC380V three-phase voltage regulator
  • Figure 2 is the design principle diagram of the low-voltage simulation system for the equivalent test of the 10KV distribution network.
  • Example 1 As shown in Figures 1-2, a low-voltage simulation system for equivalent testing of 10KV distribution network, including system simulation power supply, magnetic saturation isolation transformer, simulation transmission line, three-phase transformer and distribution low-voltage load, system simulation
  • the power supply and the output end are sequentially connected with magnetic saturation isolation transformers, simulated transmission lines, three-phase transformers and low-voltage loads for distribution.
  • the simulated transmission lines are equipped with low-voltage 3-phase external circuit breaker switches and low-voltage circuit breakers.
  • Customized multiple 1:1 three-phase transformers (capacity 200W, output three-phase four, phase voltage AC220V) to simulate 10KV distribution transformers; at the same time, use small electric fans, light bulbs, etc. to simulate distribution of low-voltage loads.
  • the analog power supply of the above-mentioned system uses the low-voltage power distribution of the public power grid, AC220V three-phase four-low voltage power distribution, line voltage AC220V (equivalent phase-to-ground voltage AC220V), line power: no more than 2KW; using the low-voltage power distribution of the public power grid ( AC220V three-phase four low-voltage power distribution) as the system simulation power supply, use 1:1 magnetic saturation isolation transformer (input Y type, output triangle) to become AC380V three-phase four low-voltage power distribution, in order to simulate single-phase grounding or phase-to-phase short circuit, Can play a role in safety protection.
  • the above-mentioned simulated transmission lines use 2.5 square millimeter multi-strand insulated conductors; the simulated transmission lines use 300m*3 outgoing lines each, and the simulated substation 10KV distribution network outgoing lines.
  • the platform in order to ensure the stability of the input power supply, is designed to add a set of 3-phase AC voltage regulators before the input isolation transformer.
  • a plurality of independent grounding points are provided on the test site for simulating single-phase grounding fault testing.
  • Embodiment 2 A simulation method of a 10KV distribution network equivalent test low-voltage simulation system, the method is: using a magnetic saturation isolation transformer to realize the conversion of three-phase four-wire AC220V low-voltage power distribution to low-voltage neutral point ungrounded three-phase
  • the low-voltage AC380V power transmission system with three-phase system is used to simulate the 10KV neutral point ungrounded distribution network power transmission system.
  • This design solves the problem of safe and efficient measurement of various three-phase three-wire neutral point ungrounded power transmission systems due to the high voltage level of the 10KV distribution network transmission system.

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Abstract

一种10KV配网等效测试低压模拟系统及其模拟方法，该模拟系统包括系统模拟电源、磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，系统模拟电源、输出端依次连接有磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，模拟输电线上安装有低压3相外置断路器开关和低压断路器。充分利用低压等效线路模拟设计，用低等级的线路电压模拟10KV的配网电气特性，可进一步降低成套设备的成本，并显著降低安全防护标准要求，消除培训人员的心里压力。

Description

一种10KV配网等效测试低压模拟系统及其模拟方法 技术领域
本发明涉及一种10KV配网等效测试低压模拟系统及其模拟方法，属于10KV配网等效测试低压模拟技术领域。
背景技术
目前我国10KV电力系统大部分采用三相中性点不接地系统设计：即除了10KV配电网电力设备本身的分布电容可以接地外，其它都不接地。这种配电网系统设计，其优点是发生接地故障时，故障电流小，对电力设备的破坏不致严重，因此可在发生单相接地不形成短路回路的情况下，按照电力运行规程规定可继续运行1-2小时。缺点是：在发生单相接地故障时可能产生瞬间过电压，对设备及人身安全构成威胁，这就要求，配电网运行管理人员，要求迅速查找到故障线路并将其切除，否则，会造成故障扩大危及电力系统及设备的安全。
10KV配电网的安全运行维护以及发生故障时迅速查找到故障线路并恢复正常运行，对供电部门的运维人员就提出了很高的要求：配电网运维人员必须深入掌握10KV三相中性点不接地系统的运行特性，并在此基础上，充分利用电力部门拥有的配电自动化等各种技术，实现对配电网的高水平运维。
由于10KV配电网为中压输电网，由于电压高，输送功率大，直接在这种电压等级的线路上，进行各种运行实验，存在技术难度高，风险大等缺点。
发明内容
本发明要解决的技术问题是：提供一种10KV配网等效测试低压模拟系统及其模拟方法，以解决上述现有技术中存在的问题。
本发明采取的技术方案为：一种10KV配网等效测试低压模拟系统，包括系统模拟电源、磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，系统模拟电源、输出端依次连接有磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，模拟输电线上安装有低压3相外置断路器开关和低压断路器。
优选的，上述系统模拟电源利用公用电网的低压配电，AC220V三相四低压配电。
优选的，上述模拟输电线采用2.5平方毫米的多股绝缘导线。
优选的，上述模拟输电线采用每条出线300米*3根。
优选的，上述磁饱和隔离变压器3相交流稳压器。
优选的，上述在测试场地设置具有多个独立接地点。
优选的，上述磁饱和隔离变压器使用1：1磁饱和隔离变压器，输入Y型，输出三角形。
一种10KV配网等效测试低压模拟系统的模拟方法，该方法为：利用磁饱和隔离变压器对三相四线的AC220V低压配电转换为低压中性点不接地的三相三线制的低压AC380V输电系统，断路器开关和低压断路器的开闭，实现10KV中性点不接地配网输电系统的模拟。
本发明的有益效果：与现有技术相比，本发明效果如下：
(1)充分利用低压等效线路模拟设计，用低等级的线路电压模拟10KV的配网电气特性，可进一步降低成套设备的成本，并显著降低安全防护标准要求，消除培训人员的心里压力；
(2)可充分利用各种低压配电设备，实现灵活的现场工作模式选择，有效提高工作效率，简化培训、实验测试的工作量；
(3)等效平台电源使用三相四线400V低压配电，易于架设安装；
(4)采用隔离变压器设计，等效测试平台与主网分立，避免平台测试人员的意外触电造成伤害。
附图说明
图1是AC380V三相稳压设计原理图；
图2是10KV配网等效测试低压模拟系统设计原理图。
具体实施方式
下面结合附图及具体的实施例对本发明进行进一步介绍。
实施例1：如图1-图2所示，一种10KV配网等效测试低压模拟系统，包括系统模拟电源、磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，系统模拟电源、输出端依次连接有磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，模拟输电线上安装有低压3相外置断路器开关和低压断路器，在模拟输电线路中间的分段点，使用低压3相外置断路器开关(具有开关控制功能)，在模拟线路每条出线上，使用低压断路器，用于模拟中压断路器(可模拟重合闸功能)。定制多台1：1三相变压器(容量200W，输出三相四，相电压AC220V)，用于模拟10KV配电变压器；同时用小型电风扇、灯泡等模拟配电低压负载。
优选的，上述系统模拟电源利用公用电网的低压配电，AC220V三相四低压配电，线电压AC220V(等效相对地电压AC220V)，线路功率：不大于2KW；利用公用电网的低压配电(AC220V三相四低压配电)作为系统模拟电源，使用1：1磁饱和隔离变压器(输 入Y型，输出三角形)变成AC380V三相四低压配电，以便于仿真单相接地或者相间短路时，能起到安全保护作用。
优选的，上述模拟输电线采用2.5平方毫米的多股绝缘导线；模拟输电线采用每条出线300米*3根，模拟变电站10KV配网出线。
优选的，上述磁饱和隔离变压器3相交流稳压器，为保证输入电源稳定，平台设计在输入隔离变压器前，增加1套3相交流稳压器。
优选的，上述在测试场地设置具有多个独立接地点，用于模拟单相接地故障测试。
实施例2：一种10KV配网等效测试低压模拟系统的模拟方法，该方法为：利用磁饱和隔离变压器，实现对三相四线的AC220V低压配电转换为低压中性点不接地的三相三线制的低压AC380V输电系统，用于模拟10KV中性点不接地配网输电系。此种设计解决了由于10KV配网输电系统由于电压等级高，难于进行各种三相三线制中性点不接地输电系统试验及实验电气参数安全高效的量测问题。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内，因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (8)

  1. 一种10KV配网等效测试低压模拟系统，其特征在于：包括系统模拟电源、磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，系统模拟电源、输出端依次连接有磁饱和隔离变压器、模拟输电线、三相变压器和配电低压负载，模拟输电线上安装有低压3相外置断路器开关和低压断路器。
  2. 根据权利要求1所述的一种10KV配网等效测试低压模拟系统，其特征在于：系统模拟电源利用公用电网的低压配电，AC220V三相四低压配电。
  3. 根据权利要求1所述的一种10KV配网等效测试低压模拟系统，其特征在于：模拟输电线采用2.5平方毫米的多股绝缘导线。
  4. 根据权利要求1所述的一种10KV配网等效测试低压模拟系统，其特征在于：模拟输电线采用每条出线300米*3根。
  5. 根据权利要求1所述的一种10KV配网等效测试低压模拟系统，其特征在于：磁饱和隔离变压器3相交流稳压器。
  6. 根据权利要求1所述的一种10KV配网等效测试低压模拟系统，其特征在于：在测试场地设置具有多个独立接地点。
  7. 根据权利要求1所述的一种10KV配网等效测试低压模拟系统，其特征在于：磁饱和隔离变压器使用1：1磁饱和隔离变压器，输入Y型，输出三角形。
  8. 根据权利要求1-6任一所述的一种10KV配网等效测试低压模拟系统的模拟方法，其特征在于：该方法为：利用磁饱和隔离变压器对三相四线的AC220V低压配电转换为低压中性点不接地的三相三线制的低压AC380V输电系统，断路器开关和低压断路器的开闭，实现10KV中性点不接地配网输电系统的模拟。
PCT/CN2020/131727 2020-11-16 2020-11-26 一种10kv配网等效测试低压模拟系统及其模拟方法 WO2022099796A1 (zh)

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