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CN1571229A - 补偿电容的投切开关故障检测控制装置 - Google Patents

补偿电容的投切开关故障检测控制装置 Download PDF

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CN1571229A
CN1571229A CNA2004100147816A CN200410014781A CN1571229A CN 1571229 A CN1571229 A CN 1571229A CN A2004100147816 A CNA2004100147816 A CN A2004100147816A CN 200410014781 A CN200410014781 A CN 200410014781A CN 1571229 A CN1571229 A CN 1571229A
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signal
switching
compensation capacitor
circuit
voltage
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CN100350693C (zh
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许杏桃
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Jiangsu Anfang Electric Power Technology Co ltd
Taizhou Anfang Electric Technology Co ltd
Taizhou Suyuan Kedian Co ltd
State Grid Jiangsu Electric Power Co Ltd
Taizhou Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
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KEDIAN CO Ltd SUYUAN GROUP TAIZHOU
Taizhou Power Supply Co of Jiangsu Electric Power Co
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Priority to CNB2004100147816A priority Critical patent/CN100350693C/zh
Priority to PCT/CN2004/000819 priority patent/WO2005107034A1/zh
Publication of CN1571229A publication Critical patent/CN1571229A/zh
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

本发明公开了一种应用于低压无功补偿装置中的补偿电容的投切开关故障检测控制装置，它包括：采样电路，用于采样补偿电容的端电压并将电压信号输出电压变换器，多路开关，逻辑运算器，驱动电路和执行单元，它实时采集补偿电容两端的端电压，与可控硅或接触器的触发信号比较，当两者不符合电路逻辑关系时，即判断为投切开关故障，逻辑运算器发出信号使执行单元的继电器J1工作，导致串接在补偿电容投切电路上的断路器跳闸，将补偿电容从电网上切除。因此采用本发明能检测可控硅短路或接触器触头粘连引起的故障，并且在出现上述故障后能切断补偿电容。

Description

补偿电容的投切开关故障检测控制装置
所属技术领域
本发明涉及一种应用于低压无功补偿装置中的补偿电容投切开关故障检测控制装置。
背景技术
目前国内市场上现有的低压无功自动补偿装置大多功能不全，特别是安全可靠性不高，给用户的用电器带来严重威胁。由于可控硅短路或接触器触头粘连使电容一直投在电网上，当电网电压升高，要求补偿电容切断，但由于上述故障补偿电容不能切断，使电网电压更高，一下子烧坏了用户很多用电设备，造成了很大经济损失和不良的社会影响。
发明内容
本发明克服了现有技术的不足，提供了一种补偿电容的投切开关故障检测控制装置，它能检测可控硅短路或接触器触头粘连引起的故障，并且在出现上述故障后能切断补偿电容。
为了实现上述的目的，本发明的解决方案是：一种补偿电容的投切开关故障检测控制装置，它包括采样电路、电压变换器、多路开关、逻辑运算器、驱动电路、执行单元，所述的采样电路，用于采样补偿电容的端电压并将电压信号输出；
所述的电压变换器，用于将采样得到的模拟电压信号变换成弱电开关量信号并输出；
所述的多路开关，用于选通电压变换器输出的一路信号并将其输出；
所述的逻辑运算器，用于将多路开关送入的信号与控制投切补偿电容的触发器的触发信号进行逻辑判断，出现投切开关故障即可控硅短路或接触器触头粘连时发出动作信号；
所述的驱动电路，用于将逻辑运算器发出的动作信号放大输出；
所述的执行单元，用于接受放大的动作信号，投切开关短路时使补偿电容从电网上切除。
所述的执行单元为继电器和串接在补偿电容与三相电源线之间的断路器组成，所述继电器接受驱动电路发出的动作信号，触点动作时将信号发出至断路器的分励线圈，所述断路器的分励线圈接受继电器触点送出的信号动作而跳闸，将补偿电容从电网上切除。所述的逻辑运算器为微处理器，微处理器可同时作为控制投切补偿电容的触发器。所述的逻辑运算器为异或门。
本发明的有益效果是：它利用采样电路采集补偿电容两端的端电压，经电压变换器变换成弱电开关量，与可控硅、接触器的触发信号进行逻辑运算，确定可控硅、接触器触头是否存在故障。如果触发信号与补偿电容的端电压情况相吻合，则说明投切没有故障，如果两者情况不一致，说明该切断补偿电容时没有切断，存在投切开关故障。因此采用本发明能检测可控硅短路或接触器触头粘连引起的故障，并且在出现上述故障后能切断补偿电容，避免了出现事故。
附图说明
图1为本发明一种实施例的原理框图
图2为本发明一种实施例的电路原理图
图3为本发明一种实施例应用的低压无功补偿装置的电路原理图
图4为本发明的另一种实施例的电路原理图
具体实施方式
实施例一：根据图1、图2和图3所示，本实施例是应用于具有三级补偿容量的低压无功补偿装置中的投切开关故障检测控制装置。它包括采样电路、电压变换器、多路开关、逻辑运算器、驱动电路、执行单元。采样电路用于采样补偿电容的端电压并将电压信号输出，本实施例用9路相同的采样电路来实现信号采样，图2中仅示出一路采样电路的结构，由R20和R21并接在电容器CC1A两端。每路采样信号分别经U1～U9电压变换器将模拟电压信号变换成弱电开关量信号并输出。电压变换器为光耦合隔离变换器。每路电压变换器输出的信号送入多路开关，多路开关为16路选1路，其型号为CD4067。多路开关在微处理器的控制下选通一路电压信号并将其输出至微处理器，微处理器即为逻辑运算器，将多路开关送入的信号与它发出的触发信号进行逻辑运算，当检测到的信号与触发信号不一致时，即出现投切开关故障，发出动作信号，经驱动电路ULN2003放大后输出给执行单元，执行单元为继电器J1和串接在补偿电容与三相电源线之间的断路器组成，所述继电器J1接受驱动电路发出的动作信号得电，其常开触点闭合，断路器的分励线圈得电，断路器跳闸，将补偿电容从电网上切除。
实施例二：根据图4所示，它是本发明的另一实施例，它采用分立元件实现电容两端的电压采样以及投切开关故障检测控制。图中仅给出一路采样电路及后续处理控制电路。由R25和R26并接在电容器CC1A两端构成采样电路，采样信号经光耦合电压变换器，将模拟电压信号变换成弱电开关量信号输出至逻辑运算器。逻辑运算器的另一输入为可控硅的触发信号。在本实施例中，逻辑运算器为异或门。当触发信号为低电平“0”时，可控硅没有导通，电容CC1A两端的电压应为低电平。当采样电路检测出其两端电压为“1”时，则说明可控硅发生短路，异或门输出高电平“1”，继电器J1得电，触点动作，断路器的分励线圈得电而跳闸，将电容CC1A从电网上切除。

Claims (4)

1、一种补偿电容的投切开关故障检测控制装置，其特征在于它包括：
采样电路，用于采样补偿电容的端电压并将电压信号输出；
电压变换器，用于将采样得到的模拟电压信号变换成弱电开关量信号并输出；
多路开关，用于选通电压变换器输出的一路信号并将其输出；
逻辑运算器，用于将多路开关送入的信号与控制投切补偿电容的触发器的触发信号进行逻辑判断，出现投切开关故障即可控硅短路或接触器触头粘连时发出动作信号；
驱动电路，用于将逻辑运算器发出的动作信号放大输出；
执行单元，用于接受放大的动作信号，投切开关短路时使补偿电容从电网上切除。
2、根据权利要求1所述的补偿电容的投切开关故障检测控制装置，其特征在于执行单元为继电器和串接在补偿电容与三相电源线之间的断路器组成，所述继电器用于接受驱动电路发出的动作信号，触点动作时将信号发出至断路器的分励线圈，所述断路器的分励线圈接受继电器触点送出的信号动作而跳闸，将补偿电容从电网上切除。
3、根据权利要求1所述的补偿电容的投切开关故障检测控制装置，其特征在于逻辑运算器为微处理器，微处理器可同时作为控制投切补偿电容的触发器。
4、根据权利要求1所述的补偿电容的投切开关故障检测控制装置，其特征在于逻辑运算器为异或门。
CNB2004100147816A 2004-04-29 2004-04-29 补偿电容的投切开关故障检测控制装置 Expired - Lifetime CN100350693C (zh)

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CN100440680C (zh) * 2006-02-17 2008-12-03 江苏现代电力电容器有限公司 投切低压电力电容器综合开关
CN100445073C (zh) * 2006-08-02 2008-12-24 浙江大学 注塑机机械手可关模信号触点粘连检测及报警装置
CN101895086A (zh) * 2009-05-18 2010-11-24 叶晓燕 晶闸管自动重合闸开关
CN101673736B (zh) * 2009-09-25 2012-11-14 上海宏力半导体制造有限公司 一种补偿电容的电压调制效应的方法
CN101482587B (zh) * 2008-11-28 2013-07-24 王万俊 无功补偿装置投切检测仪
CN106526477A (zh) * 2016-12-29 2017-03-22 重庆市渝展电气有限公司 一种多路开关状态监控电路
CN108226747A (zh) * 2017-11-30 2018-06-29 北京康拓科技有限公司 一种动态电路故障在线检测方法

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CN100440680C (zh) * 2006-02-17 2008-12-03 江苏现代电力电容器有限公司 投切低压电力电容器综合开关
CN100445073C (zh) * 2006-08-02 2008-12-24 浙江大学 注塑机机械手可关模信号触点粘连检测及报警装置
CN101482587B (zh) * 2008-11-28 2013-07-24 王万俊 无功补偿装置投切检测仪
CN101895086A (zh) * 2009-05-18 2010-11-24 叶晓燕 晶闸管自动重合闸开关
CN101673736B (zh) * 2009-09-25 2012-11-14 上海宏力半导体制造有限公司 一种补偿电容的电压调制效应的方法
CN106526477A (zh) * 2016-12-29 2017-03-22 重庆市渝展电气有限公司 一种多路开关状态监控电路
CN106526477B (zh) * 2016-12-29 2023-05-12 重庆市渝展电气有限公司 一种多路开关状态监控电路
CN108226747A (zh) * 2017-11-30 2018-06-29 北京康拓科技有限公司 一种动态电路故障在线检测方法

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