CN103840470B - A kind of breaker closing phase control method, Apparatus and system - Google Patents
A kind of breaker closing phase control method, Apparatus and system Download PDFInfo
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Abstract
本发明提供了一种断路器合闸相位控制方法、装置及系统,该方法包括:获取母线的电压信号;判断电压信号是否达到峰值,如果是则控制长线路中的断路器合闸,如果否则断路器不动作。以解决并联补偿线路的直流偏置问题,提高断路器设备运行的可靠性。
The invention provides a circuit breaker closing phase control method, device and system. The method includes: obtaining the voltage signal of the bus; judging whether the voltage signal reaches the peak value, and if so, controlling the closing of the circuit breaker in the long line; otherwise Circuit breaker does not operate. In order to solve the DC bias problem of the parallel compensation line and improve the reliability of the operation of the circuit breaker equipment.
Description
技术领域 technical field
本发明涉及超高压长距离输电线路技术,特别涉及超高压长距离输电线路的相控合闸技术,具体地讲是一种断路器合闸相位控制方法、装置及系统。The invention relates to the technology of ultra-high voltage long-distance transmission lines, in particular to the phase control closing technology of ultra-high voltage long-distance transmission lines, in particular to a circuit breaker closing phase control method, device and system.
背景技术 Background technique
超高压长距离输电线路经常采用高压并联电抗器来平衡线路产生的容性无功,以增加线路的输送能力,同时改善线路的工频过电压情况。电抗器容量的选取通常取决于线路容性电流以及当地系统的无功平衡情况。从无功补偿的角度,高抗容量越接近线路的容性无功,对改善无功平衡和过电压情况越有利。但若线路充电无功与高抗容量之差过小,当线路从一端空充电时,线路电流的工频分量很小。由于流过电抗器的电流不能突变,其充电过程中会产生较大的直流电流,当电流工频分量远小于直流分量时,合空线操作后相当长一段时间内(数百毫秒),流过断路器的电流没有稳定的过零点,造成并联补偿线路空充电流的直流偏置问题。若此时由于各种原因断路器进行分闸操作,可能在断路器到达分位后不能及时灭弧,持续数百毫秒的燃弧将烧损灭弧室内部器件、劣化SF6气体,并有可能发展成更大的故障。Ultra-high voltage long-distance transmission lines often use high-voltage shunt reactors to balance the capacitive reactive power generated by the line, so as to increase the transmission capacity of the line and improve the power frequency overvoltage of the line. The selection of reactor capacity usually depends on the line capacitive current and the reactive power balance of the local system. From the perspective of reactive power compensation, the closer the high resistance capacity is to the capacitive reactive power of the line, the more beneficial it is to improve reactive power balance and overvoltage conditions. But if the difference between the line charging reactive power and the high reactance capacity is too small, when the line is charged from one end, the power frequency component of the line current is very small. Since the current flowing through the reactor cannot change abruptly, a large DC current will be generated during the charging process. When the power frequency component of the current is much smaller than the DC component, the current will flow for a long period of time (hundreds of milliseconds) after the operation of the empty line. The current passing through the circuit breaker has no stable zero-crossing point, which causes the DC bias problem of the empty charging current of the parallel compensation line. If the circuit breaker performs opening operation due to various reasons at this time, the arc may not be extinguished in time after the circuit breaker reaches the position, and the arc burning lasting for hundreds of milliseconds will burn the internal components of the arc extinguishing chamber, deteriorate the SF6 gas, and possibly develop into a larger failure.
发明内容 Contents of the invention
本发明提供了一种断路器合闸相位控制方法、装置及系统,以解决并联补偿线路的直流偏置问题,提高断路器设备运行的可靠性。The invention provides a circuit breaker closing phase control method, device and system to solve the DC bias problem of parallel compensation lines and improve the reliability of circuit breaker equipment operation.
本发明的目的是,提供一种断路器合闸相位控制方法,该方法包括:获取母线的电压信号;判断所述的电压信号是否达到峰值,如果是则控制长线路中的断路器合闸,如果否则断路器不动作。The object of the present invention is to provide a circuit breaker closing phase control method, the method comprising: obtaining the voltage signal of the bus; judging whether the voltage signal reaches a peak value, and if so, controlling the closing of the circuit breaker in the long line, Otherwise the circuit breaker does not operate.
获取母线的电压信号包括:依次获取母线的ACB三相电压信号;判断A相电压信号是否达到峰值,如果是则控制长线路中的A相断路器合闸,A相断路器合闸后经过60°控制长线路中的C相断路器合闸,C相断路器合闸后经过60°控制长线路中的B相断路器合闸。Obtaining the voltage signal of the bus includes: obtaining the ACB three-phase voltage signal of the bus in turn; judging whether the voltage signal of the A phase reaches the peak value, and if so, controlling the closing of the A phase circuit breaker in the long line, and after the closing of the A phase circuit breaker, after 60 ° Control the closing of the C-phase circuit breaker in the long line, and control the closing of the B-phase circuit breaker in the long line after the C-phase circuit breaker is closed.
断路器合闸相位控制方法包括:获取长线路的电流突变信号;根据电流突变信号得到断路器从起始合闸到回路实际导通的导通时间,并根据导通时间对断路器进行反馈校验。The circuit breaker closing phase control method includes: obtaining the current mutation signal of the long line; obtaining the conduction time from the initial closing of the circuit breaker to the actual conduction of the circuit according to the current mutation signal, and performing feedback calibration on the circuit breaker according to the conduction time. test.
本发明的目的是,提供一种断路器合闸相位控制装置,该装置包括:电压信号输入单元,用于获取母线的电压信号;相位控制单元,用于判断电压信号是否达到峰值,如果是则向长线路中的断路器发送合闸控制指令。The object of the present invention is to provide a circuit breaker closing phase control device, which includes: a voltage signal input unit for obtaining the voltage signal of the bus; a phase control unit for judging whether the voltage signal reaches a peak value, and if so, then Send closing control commands to circuit breakers in long lines.
本发明的目的是,提供一种断路器合闸相位控制系统,该系统包括:断路器和断路器合闸相位控制装置;断路器与断路器合闸相位控制装置相连接;断路器合闸相位控制装置包括:电压信号输入单元,用于获取母线的电压信号;相位控制单元,用于判断电压信号是否达到峰值,如果是则向长线路中的断路器发送合闸控制指令;电流输入单元,用于获取长线路的电流突变信号;反馈校验单元,用于根据电流突变信号得到断路器从起始合闸到回路实际导通的导通时间,并根据导通时间向断路器发送反馈校验信号。The object of the present invention is to provide a circuit breaker closing phase control system, which includes: a circuit breaker and a circuit breaker closing phase control device; the circuit breaker is connected to the circuit breaker closing phase control device; the circuit breaker closing phase control device The control device includes: a voltage signal input unit, used to obtain the voltage signal of the bus; a phase control unit, used to judge whether the voltage signal reaches the peak value, and if so, send a closing control command to the circuit breaker in the long line; a current input unit, It is used to obtain the current mutation signal of the long line; the feedback verification unit is used to obtain the conduction time from the initial closing of the circuit breaker to the actual conduction of the circuit according to the current mutation signal, and send a feedback calibration to the circuit breaker according to the conduction time. test signal.
本发明的有益效果在于:通过采用合闸相控技术,抑制合空线产生的直流电流,从而避免直流偏置产生的风险;使合空线后断路器在任何条件下分闸时,断路器电流都有稳定的过零点,保证断路器可靠开断,提高断路器的安全运行水平。The beneficial effects of the present invention are: by adopting the closing phase control technology, the DC current generated by the closing line is suppressed, thereby avoiding the risk of DC bias; when the circuit breaker opens under any conditions after closing the empty line, the The current has a stable zero-crossing point, which ensures the reliable breaking of the circuit breaker and improves the safe operation level of the circuit breaker.
附图说明 Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts.
图1为本发明实施例的断路器合闸相位控制方法流程图;Fig. 1 is the flow chart of the circuit breaker closing phase control method of the embodiment of the present invention;
图2为本发明实施例的三相断路器合闸相位控制方法流程图;Fig. 2 is the flow chart of the method for controlling the closing phase of a three-phase circuit breaker according to an embodiment of the present invention;
图3为本发明实施例的线路合闸相位与过零时间的关系波形图;Fig. 3 is the waveform diagram of the relationship between the circuit closing phase and the zero-crossing time of the embodiment of the present invention;
图4为本发明实施例的断路器合闸时间控制波形图;Fig. 4 is the circuit breaker closing time control waveform diagram of the embodiment of the present invention;
图5为本发明实施例电流突变的电流波形图;5 is a current waveform diagram of a sudden change in current according to an embodiment of the present invention;
图6为本发明实施例的断路器合闸相位控制装置的结构框图;6 is a structural block diagram of a circuit breaker closing phase control device according to an embodiment of the present invention;
图7为本发明实施例的三相断路器合闸相位控制装置的结构框图;7 is a structural block diagram of a three-phase circuit breaker closing phase control device according to an embodiment of the present invention;
图8为本发明实施例的断路器合闸相位控制装置的电路原理图;8 is a schematic circuit diagram of a circuit breaker closing phase control device according to an embodiment of the present invention;
图9为本发明实施例的断路器合闸相位控制系统的电路原理图;9 is a schematic circuit diagram of a circuit breaker closing phase control system according to an embodiment of the present invention;
图10为本发明实施例的断路器合闸相位控制系统的应用示意图。Fig. 10 is an application schematic diagram of a circuit breaker closing phase control system according to an embodiment of the present invention.
具体实施方式 detailed description
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
如图1所示,本实施例的断路器合闸相位控制方法包括:获取母线的电压信号(步骤S101);判断电压信号是否达到峰值,如果是则控制长线路中的断路器合闸,如果否则断路器不动作(步骤S102)。As shown in Figure 1, the circuit breaker closing phase control method of this embodiment includes: obtaining the voltage signal of the bus (step S101); judging whether the voltage signal reaches the peak value, if so, controlling the closing of the circuit breaker in the long line, if Otherwise, the circuit breaker does not operate (step S102).
如图2所示,本实施例的三相断路器合闸相位控制方法具体包括:依次获取母线的ACB三相电压信号(步骤S201);判断A相电压信号是否达到峰值,如果是则控制长线路中的A相断路器合闸,A相断路器合闸后经过60°控制长线路中的C相断路器合闸,C相断路器合闸后经过60°控制长线路中的B相断路器合闸(步骤S202)。获取长线路的电流突变信号(步骤S203);根据电流突变信号得到断路器从起始合闸到回路实际导通的导通时间,并根据导通时间对断路器进行反馈校验(步骤S204)。As shown in Figure 2, the method for controlling the closing phase of a three-phase circuit breaker in this embodiment specifically includes: sequentially acquiring ACB three-phase voltage signals of the bus (step S201); The phase A circuit breaker in the line is closed, and the phase C circuit breaker in the long line is controlled to close by 60° after the phase A circuit breaker is closed, and the B phase in the long line is controlled to be open by 60° after the phase C circuit breaker is closed switch on (step S202). Acquire the current mutation signal of the long line (step S203); obtain the conduction time from the initial closing of the circuit breaker to the actual conduction of the circuit according to the current mutation signal, and perform feedback verification on the circuit breaker according to the conduction time (step S204) .
在断路器合闸相位控制方法中,本案发明人通过对带并联补偿线路直流偏置产生的机理及影响因素的研究发现,线路投切产生直流偏置的大小与并联电抗器的补偿度、合闸相位及断路器合闸电阻配置情况有关,而且其他条件不变情况下通过控制断路器的合闸相位可以有效抑制直流偏置的现象。In the circuit breaker closing phase control method, the inventors of this case have found through the research on the mechanism and influencing factors of the DC bias of the line with parallel compensation that the magnitude of the DC bias generated by line switching is related to the compensation degree of the shunt reactor, the combined The closing phase of the circuit breaker is related to the configuration of the closing resistance of the circuit breaker, and the phenomenon of DC bias can be effectively suppressed by controlling the closing phase of the circuit breaker when other conditions remain unchanged.
在线路断路器没有合闸电阻的情况下,合闸电流直流分量的幅值随合闸相位成正弦规律变化。当首端母线电压用正弦形式表示时,合闸相位为0°和180°(即母线电压过零时)产生的直流分量最大,等于流过电抗器交流电流的峰值;合闸相位为90°和270°(即母线电压峰值)时产生的直流分量为零。则断路器合闸后电流的过零时间就与合闸相位有着直接关系:在一定相位下合闸产生的直流分量小于线路剩余交流分量的峰值时,合闸电流具有稳定的过零点。如图3所示,某条线路合闸相位位于-20~20°和160~200°之间;合闸角位于其它相位时,直流分量大于交流分量,合闸后电流在短时间内均没有稳定过零点。即,如能控制合闸相位,使三相在一个周期内分别合闸,三相合闸相位均为能快速过零的相位,则能避免直流偏置对断路器“合分”操作的造成的风险。In the case that the circuit breaker has no closing resistance, the magnitude of the DC component of the closing current changes sinusoidally with the closing phase. When the bus voltage at the head end is expressed in sinusoidal form, the closing phase is 0° and 180° (that is, when the bus voltage crosses zero), the DC component generated is the largest, which is equal to the peak value of the AC current flowing through the reactor; the closing phase is 90° And 270° (that is, the bus voltage peak value) when the DC component is zero. Then the zero-crossing time of the current after the circuit breaker is closed is directly related to the closing phase: when the DC component generated by closing is less than the peak value of the remaining AC component of the line at a certain phase, the closing current has a stable zero-crossing point. As shown in Figure 3, the closing phase of a certain line is between -20° to 20° and 160° to 200°; when the closing angle is in other phases, the DC component is greater than the AC component, and the current does not change within a short time after closing. Stable zero crossing. That is, if the closing phase can be controlled so that the three phases are closed separately in one cycle, and the three-phase closing phases are all phases that can quickly cross zero, then the damage caused by the DC bias to the "closing and opening" operation of the circuit breaker can be avoided. risk.
合闸相位控制方法对断路器的要求总体有以下几个方面:The closing phase control method has the following requirements on the circuit breaker:
1)合闸时间稳定。断路器合闸相位控制与断路器的机械操作稳定性、断路器机构在不同温度下的时间特性、断路器预击穿时间特性以及断路器在不同控制电压、不同机构压力下的操作时间密切相关。通过对常温下断路器机械时间特性试验,得到合闸时间的概率分布和偏差值。1) The closing time is stable. The closing phase control of the circuit breaker is closely related to the mechanical operation stability of the circuit breaker, the time characteristics of the circuit breaker mechanism at different temperatures, the pre-breakdown time characteristics of the circuit breaker, and the operating time of the circuit breaker under different control voltages and different mechanism pressures . The probability distribution and deviation value of the closing time are obtained by testing the mechanical time characteristics of the circuit breaker at room temperature.
合闸时间均值μ:
样本方差:
标准偏差σ=0.209ms。Standard deviation σ = 0.209ms.
得到3σ=0.209×3=0.627ms。3σ = 0.209 x 3 = 0.627ms is obtained.
符合国际大电网会议CIGRE指南中规定了允许动作偏差3σ≤±1.5ms的要求。It complies with the requirements of the allowable action deviation 3σ≤±1.5ms stipulated in the CIGRE guidelines of the International Conference on Large Power Grids.
2)机械性能不受周围环境影响或环境影响可有效预估。通过对不同温度条件下断路器机械特性配合试验,得到断路器机械特性中的合闸时间受环境温度因素的影响的基本试验数据。并输入到选相合闸装置中进行数值补偿。2) The mechanical properties are not affected by the surrounding environment or can be effectively estimated by the environment. Through the matching test of the mechanical characteristics of the circuit breaker under different temperature conditions, the basic test data that the closing time of the mechanical characteristics of the circuit breaker is affected by the environmental temperature factor is obtained. And input it to the phase selection closing device for numerical compensation.
3)预燃弧时间及燃弧时间短。通过带电关合预击穿时间特性研究(RDDS)试验,得到断口间绝缘强度减小率的曲线,从而得到在不同相位合闸时的预击穿时间。在选相合闸操作时,将机械合闸时间去掉在该相位合闸的预击穿时间来确定选相合闸的最佳合闸相位。3) The pre-arcing time and arcing time are short. The curve of the reduction rate of insulation strength between fractures is obtained through the RDDS test of the pre-breakdown time of live closing, so as to obtain the pre-breakdown time when closing in different phases. During the phase selection closing operation, the mechanical closing time is subtracted from the pre-breakdown time of the phase closing to determine the optimal closing phase of the phase selection closing.
4)合闸无过冲。通过不同控制电压、不同液压条件下断路器机械时间特性试验,得出不同控制电压、不同操作油压下的合闸时间曲线。4) Closing without overshoot. Through the mechanical time characteristic test of the circuit breaker under different control voltages and different hydraulic conditions, the closing time curves under different control voltages and different operating oil pressures are obtained.
如图4所示,根据上述对于直流偏置产生机理及影响因素的分析,控制断路器在母线电压达到峰值时合闸可使产生的直流分量最小。如果按照三相均在正峰值时刻合闸,则三相合闸的最大不同期将达到13.3ms左右。针对合闸不同期过大的问题,在本实施例中采用三相按照ACB顺序合闸的策略,即A相在正(或负)极性峰值合闸后,经过60°C相电压达到负(或正)极性峰值合闸,再经过60°B相电压达到正(或负)极性峰值合闸,从而将三相合闸的理论不同期时间缩短至6.7ms,同时保证抑制直流偏置的有效性。As shown in Figure 4, according to the above-mentioned analysis of the mechanism and influencing factors of DC bias, controlling the closing of the circuit breaker when the bus voltage reaches the peak value can minimize the generated DC component. If all three phases are switched on at the positive peak time, the maximum difference between the three-phase switching on will reach about 13.3ms. Aiming at the problem that the closing phase is too large, in this embodiment, the strategy of three-phase closing according to the ACB sequence is adopted, that is, after phase A closes at the peak of positive (or negative) polarity, the phase voltage reaches negative at 60°C. (or positive) polarity peak closing, and then through 60°B phase voltage to reach positive (or negative) polarity peak closing, thus shortening the theoretical out-of-synchronization time of three-phase closing to 6.7ms, while ensuring the suppression of DC bias effectiveness.
如图5所示,回路的实际导通时刻可以通过线路的电压或电流突变来判断。由于在回路导通前断路器电流始终为零,且完全不受相邻相的干扰,有利于突变判据的实现。因此在本实施例中,采用电流突变作为判断回路实际导通的依据,并进行相应的反馈环节设置。As shown in Figure 5, the actual turn-on moment of the loop can be judged by the sudden change of the voltage or current of the line. Because the current of the circuit breaker is always zero before the circuit is turned on, and it is completely free from the interference of adjacent phases, it is beneficial to the realization of the sudden change criterion. Therefore, in this embodiment, the current mutation is used as the basis for judging the actual conduction of the loop, and the corresponding feedback link is set.
如图6所示,本实施例的断路器合闸相位控制装置100包括:电压信号输入单元101,用于获取母线的电压信号;相位控制单元102,用于判断电压信号是否达到峰值,如果是则向长线路中的断路器发送合闸控制指令。As shown in Figure 6, the circuit breaker closing phase control device 100 of this embodiment includes: a voltage signal input unit 101, used to obtain the voltage signal of the bus; a phase control unit 102, used to determine whether the voltage signal reaches the peak value, if it is Then send a closing control command to the circuit breaker in the long line.
如图7所示,本实施例的三相断路器合闸相位控制装置100'包括:电压信号输入单元101',依次获取母线的ACB三相电压信号;相位控制单元102',判断所述的A相电压信号是否达到峰值,如果是则相长线路中的A相断路器发送合闸控制指令,A相断路器合闸后经过60°向长线路中的C相断路器发送合闸控制指令,C相断路器合闸后经过60°向长线路中的B相断路器发送合闸控制指令。电流信号输入单元103',用于获取所述长线路的电流突变信号;反馈校验单元104',用于根据电流突变信号得到断路器从起始合闸到回路实际导通的导通时间,并根据导通时间向断路器发送反馈校验信号。As shown in Figure 7, the three-phase circuit breaker closing phase control device 100' of this embodiment includes: a voltage signal input unit 101', which sequentially acquires the ACB three-phase voltage signals of the bus; a phase control unit 102', which judges the Whether the phase A voltage signal reaches the peak value, if so, the phase A circuit breaker in the long line sends a closing control command, and the phase A circuit breaker sends a closing control command to the C phase circuit breaker in the long line after closing 60° , After the C-phase circuit breaker is closed, it sends a closing control command to the B-phase circuit breaker in the long line through 60°. The current signal input unit 103' is used to obtain the current mutation signal of the long line; the feedback verification unit 104' is used to obtain the conduction time from the initial closing of the circuit breaker to the actual conduction of the circuit according to the current mutation signal, And send a feedback verification signal to the circuit breaker according to the conduction time.
如图8所示,实现本实施例的断路器合闸相位控制装置一个具体电路包括:中央处理单元(CPU)、交流输入部分(电流信号输入和电压信号输入)、变送器、扩展板和电源板。其中:交流输入部分具有三相电流输入端、母线A相电压输入端、母线B相电压输入端和母线C相电压输入。扩展板具有A相合闸输出、B相合闸输出、C相合闸输出。电源板具有电源输入(220DC/AC)和故障报警及保护动作继电器信号出口。As shown in Figure 8, a specific circuit for implementing the circuit breaker closing phase control device of this embodiment includes: a central processing unit (CPU), an AC input part (current signal input and voltage signal input), a transmitter, an expansion board and Power Board. Among them: the AC input part has a three-phase current input terminal, a bus A phase voltage input terminal, a bus B phase voltage input terminal and a bus C phase voltage input. The expansion board has A-phase closing output, B-phase closing output, and C-phase closing output. The power board has a power input (220DC/AC) and a fault alarm and protection action relay signal outlet.
如图9、图10所示,本实施例的断路器合闸相位控制系统,包括:断路器和断路器合闸相位控制装置;断路器与断路器合闸相位控制装置相连接;断路器合闸相位控制装置包括:电压信号输入单元,用于获取母线的电压信号;相位控制单元,用于判断所述的电压信号是否达到峰值,如果是则向长线路中的断路器发送合闸控制指令;电流输入单元,用于获取所述长线路的电流突变信号;反馈校验单元,用于根据所述的电流突变信号得到断路器从起始合闸到回路实际导通的导通时间,并根据所述的导通时间向所述的断路器发送反馈校验信号。电压信号输入单元依次获取母线的ACB三相电压信号;相位控制单元判断A相电压信号是否达到峰值,如果是则相长线路中的A相断路器发送合闸控制指令,A相断路器合闸后经过60°向长线路中的C相断路器发送合闸控制指令,C相断路器合闸后经过60°向长线路中的B相断路器发送合闸控制指令。As shown in Figure 9 and Figure 10, the circuit breaker closing phase control system of this embodiment includes: a circuit breaker and a circuit breaker closing phase control device; the circuit breaker is connected to the circuit breaker closing phase control device; The gate phase control device includes: a voltage signal input unit, which is used to obtain the voltage signal of the bus; a phase control unit, which is used to judge whether the voltage signal reaches the peak value, and if so, send a closing control command to the circuit breaker in the long line The current input unit is used to obtain the current mutation signal of the long line; the feedback verification unit is used to obtain the conduction time from the initial closing of the circuit breaker to the actual conduction of the circuit according to the current mutation signal, and Sending a feedback verification signal to the circuit breaker according to the conduction time. The voltage signal input unit sequentially acquires the ACB three-phase voltage signal of the bus; the phase control unit judges whether the A-phase voltage signal reaches the peak value, and if so, the A-phase circuit breaker in the phase-long line sends a closing control command, and the A-phase circuit breaker closes After 60°, send a closing control command to the C-phase circuit breaker in the long line, and after the C-phase circuit breaker is closed, send a closing control command to the B-phase circuit breaker in the long line after 60°.
本实施例的合闸相控装置的应用使得合闸所造成的涌流和过电压大大降低,有利于整个电网的稳定,从而降低了电力系统的建设和维护费用。由于合闸相控装置的应用,使得取消断路器分合闸电阻及相关控制设备成为可能,从而能够大大简化断路器的内部结构,提高设备可靠性和降低生产成本。据统计,断路器的合闸电阻及相关控制设备占到整个断路器成本的8%~10%。降低分断时断路器触头的电气磨损,减少断路器触头重燃的可能性,延长断路器设备的使用寿命和维护周期。对于关合电容器组或者变压器而言,相位控制技术的应用能够降低涌流,使得电容器或变压器的绝缘结构设计变得相对简单,也更易于保护的故障判别。对于特高压电网交流系统,合闸相位控制装置的应用能够显著降低线路等特高压电力设备的绝缘要求,从而简化网架结构和紧凑型线路的设计。The application of the closing phase control device of this embodiment greatly reduces the inrush current and overvoltage caused by closing, which is beneficial to the stability of the entire power grid, thereby reducing the construction and maintenance costs of the power system. Due to the application of the closing phase control device, it is possible to cancel the opening and closing resistance of the circuit breaker and related control equipment, thereby greatly simplifying the internal structure of the circuit breaker, improving equipment reliability and reducing production costs. According to statistics, the closing resistor and related control equipment of the circuit breaker account for 8% to 10% of the cost of the entire circuit breaker. Reduce the electrical wear of the circuit breaker contacts during breaking, reduce the possibility of re-ignition of the circuit breaker contacts, and prolong the service life and maintenance cycle of the circuit breaker equipment. For closing capacitor banks or transformers, the application of phase control technology can reduce the inrush current, making the insulation structure design of capacitors or transformers relatively simple, and it is also easier to identify faults for protection. For UHV grid AC systems, the application of closing phase control devices can significantly reduce the insulation requirements of UHV power equipment such as lines, thereby simplifying the design of grid structures and compact lines.
本发明中应用了具体实施例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本发明的限制。In the present invention, specific examples have been applied to explain the principles and implementation methods of the present invention, and the descriptions of the above examples are only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to this The idea of the invention will have changes in the specific implementation and scope of application. To sum up, the contents of this specification should not be construed as limiting the present invention.
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