CN105471095B - A kind of low-voltage alternating-current looped network ring current monitoring method - Google Patents
A kind of low-voltage alternating-current looped network ring current monitoring method Download PDFInfo
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Abstract
一种低压交流环网回路电源监测方法，在交流环网中加装备低压交流环网电源监视、备投装置：在交流环网回路两侧分别加装了两个低电压继电器和一个中间继电器，一个交流接触器，并在测控装置增设低压交流环网回路失压监视信号回路及监控后台信号，使低压环网回路在运行中得到了实时监控，当交流环网电源失去电压或出现异常后，自动投入备用电源，同时在第一时间发出相应信号。本发明的优点：在变电站低压交流环网电源失去后，备用电源会自动投入运行，同时发出故障信号，值班人员可根据后台机信号第一时间发现，确定故障范围，缩短了运行人员故障处理的时间及环网电源失电的时间，提高和保证了设备的安全可靠性运行能力。A low-voltage AC ring network circuit power monitoring method, in which a low-voltage AC ring network power supply monitoring and backup device is installed in the AC ring network: two low-voltage relays and an intermediate relay are respectively installed on both sides of the AC ring network circuit, An AC contactor, and a low-voltage AC ring network circuit voltage loss monitoring signal circuit and monitoring background signal are added to the measurement and control device, so that the low-voltage ring network circuit can be monitored in real time during operation. When the AC ring network power supply loses voltage or is abnormal, Automatically switch on the backup power supply, and at the same time send out the corresponding signal at the first time. The advantages of the present invention are: after the power supply of the low-voltage AC ring network in the substation is lost, the backup power supply will be automatically put into operation, and at the same time, a fault signal will be sent out, and the personnel on duty can find out the fault range at the first time according to the signal of the background machine, and shorten the time spent on fault handling by the operating personnel. The time and the power failure time of the ring network power supply improve and guarantee the safe and reliable operation ability of the equipment.
Description
技术领域technical field
本发明涉及电源回路领域，特别涉及了一种低压交流环网回路电源监测方法。The invention relates to the field of power circuits, in particular to a method for monitoring the power of a low-voltage AC ring network circuit.
背景技术Background technique
目前变电站低压交流环网电源均采用交流空气开关人为控制，两路电源一路运行、一路备用运行方式，没有加装信号监视回路和电源备投装置。在运行中，常会出现因各种原因引起的某一空气开关跳闸，由于没有交流环网电源监视信号和电源备投装置，只能在运行人员巡视或设备发出异常信号时，如开关打压超时等，否则无法判断其环网电源是否良好，造成开关无法正常打压、冬季加热器失电，目前变电站逐步已实现无人值守，对变电站的巡视次数也相应减少，所以对于上述问题更难以发现。At present, the low-voltage AC ring network power supply of the substation is controlled manually by the AC air switch. The two power sources are operated in one way and the other in standby mode. There is no signal monitoring circuit and power backup device installed. During operation, a certain air switch often trips due to various reasons. Since there is no AC ring network power supply monitoring signal and power backup device, it can only be used when the operator is patrolling or the equipment sends out an abnormal signal, such as when the switch is suppressed overtime, etc. , otherwise it is impossible to judge whether the ring network power supply is good, causing the switch to be unable to press normally and the heater to lose power in winter. At present, the substation has gradually realized unattended, and the number of inspections of the substation has also been reduced accordingly, so it is more difficult to find the above problems.
发明内容Contents of the invention
本发明的目的是为了最大限度避免低压交流环网失压后，造成各种故障的发生，特提供了一种低压交流环网回路电源监测方法。The purpose of the present invention is to avoid the occurrence of various faults caused by the loss of voltage of the low-voltage AC ring network to the greatest extent, and specially provides a method for monitoring the loop power supply of the low-voltage AC ring network.
本发明提供了一种低压交流环网回路电源监测方法，其特征在于：所述的低压交流环网回路电源监测方法为，在交流环网中加装备低压交流环网电源监视、备投装置：在交流环网回路两侧分别加装了两个低电压继电器和一个中间继电器，一个交流接触器，详见图2和图3。The present invention provides a low-voltage AC ring network loop power monitoring method, which is characterized in that: the low-voltage AC ring network loop power monitoring method is to add a low-voltage AC ring network power monitoring and backup device to the AC ring network: Two low-voltage relays, an intermediate relay and an AC contactor are installed on both sides of the AC ring network circuit, see Figure 2 and Figure 3 for details.
实现对交流环网回路的电源监控和备投功能，并在测控装置增设低压交流环网回路失压监视信号回路及监控后台信号，使低压环网回路在运行中得到了实时监控，当交流环网电源失去电压或出现异常后，自动投入备用电源，同时在第一时间发出相应信号，提醒监控人员，并通知运行维护人员进行及时检查、处理。Realize the power monitoring and standby switching functions of the AC ring network circuit, and add a low-voltage AC ring network circuit voltage loss monitoring signal circuit and monitoring background signal in the measurement and control device, so that the low-voltage ring network circuit can be monitored in real time during operation. When the network power supply loses voltage or is abnormal, it will automatically switch to the backup power supply, and at the same time send a corresponding signal at the first time to remind the monitoring personnel and notify the operation and maintenance personnel to check and deal with it in time.
所述的低压交流环网电源监视、备投工作原理：在环网回路未送电前，由于YJ1、YJ2低电压继电器在失磁状态，YJ1、YJ2、YJ3、YJ4抵电压继电器常闭接点闭合，监控后台机发出“1路电源开路”、“2路电源开路”、“1路电源故障”、“2路电源故障”信号；The working principle of the low-voltage AC ring network power supply monitoring and standby switching: before the ring network circuit is powered, because the YJ1 and YJ2 low-voltage relays are in the state of demagnetization, the normally closed contacts of the YJ1, YJ2, YJ3, and YJ4 contact voltage relays are closed , the monitoring background machine sends out signals of "1-way power supply open circuit", "2-way power supply open circuit", "1-way power supply failure", "2-way power supply failure" signals;
交流环网由1路电源供电正常运行：The AC ring network is powered by 1 power supply for normal operation:
如交流环网由1路电源供电时，首先合上k1空气开关，再合上k2空气开关；当合上k1空气开关后，380V交流1路电源A相电源，经c1交流接触器线圈至c2交流接触器常闭接点、YJ1低电压继电器常闭接点至380V交流1路电源B相电源，c1交流接触器励磁，主常开触点闭合，c1交流接触器常开接点闭合，c1交流接触器常闭接点断开，交流电源送至c2号交流接触器主常开触点处及环网回路所带各回路；c1交流接触器常开接点闭合，使380V交流1路电源A相电源，经c1交流接触器线圈、c1交流接触器常开接点至380V交流1路电源B相电源，c1交流接触器实现自保持，YJ1、YJ2低电压继电器励磁，经YJ1、YJ2抵电压继电器常闭接点断开监控后台机信号“1路电源开路”、“2路电源开路”信号回路，“1路电源开路”、“2路电源开路”信号复归；If the AC ring network is powered by 1-way power supply, first turn on the k1 air switch, and then turn on the k2 air switch; when the k1 air switch is turned on, the 380V AC 1-way power supply A-phase power supply passes through the c1 AC contactor coil to c2 AC contactor normally closed contact, YJ1 low voltage relay normally closed contact to 380V AC 1-way power supply B-phase power supply, c1 AC contactor excitation, main normally open contact closed, c1 AC contactor normally open contact closed, c1 AC contactor The normally closed contact is disconnected, and the AC power is sent to the main normally open contact of the AC contactor c2 and the loops of the ring network circuit; the normally open contact of the c1 AC contactor is closed, so that the 380V AC 1-way power supply A-phase power supply, through c1 AC contactor coil, c1 AC contactor normally open contact to 380V AC 1-way power supply B-phase power supply, c1 AC contactor realizes self-holding, YJ1, YJ2 low-voltage relay excitation, YJ1, YJ2 reach voltage relay normally closed contact breaks Open the monitoring background machine signal "1 power supply open circuit", "2 power supply open circuit" signal loop, "1 power supply open circuit", "2 power supply open circuit" signal return;
当合上k1空气开关后，380V交流1路电源A相电源至YJ3低电压继电器线圈至380V交流1路电源B相电源，YJ3低电压继电器励磁，YJ3抵电压继电器常闭接点断开监控后台机信号“1路电源故障”信号回路，“1路电源故障”信号复归；When the k1 air switch is closed, 380V AC 1-way power supply A-phase power supply to YJ3 low-voltage relay coil to 380V AC 1-way power supply B-phase power supply, YJ3 low-voltage relay excitation, YJ3 resistance voltage relay normally closed contact disconnected monitoring background machine Signal "1-way power failure" signal loop, "1-way power failure" signal reset;
当合上k2空气开关后，380V交流2路电源A相电源，经c2交流接触器线圈至c1交流接触器常闭接点、YJ2低电压继电器常闭接点，380V交流2路电源B相电源至c1交流接触器常闭接点，YJ1低电压继电器常闭接点，由于c1交流接触器常闭接点、YJ2低电压继电器常闭接点此时在开位，所以c2交流接触器线圈回路无法接通，不能励磁；When the k2 air switch is turned on, the 380V AC 2-way power supply, phase A, passes through the coil of the c2 AC contactor to the normally closed contact of the c1 AC contactor, the normally closed contact of the YJ2 low-voltage relay, and the 380V AC 2-way power supply to the B-phase power supply. The normally closed contact of c1 AC contactor and the normally closed contact of YJ1 low-voltage relay, because the normally closed contact of c1 AC contactor and the normally closed contact of YJ2 low-voltage relay are in the open position at this time, the coil circuit of c2 AC contactor cannot be connected. excitation;
当合上k2空气开关后，380V交流2路电源A相电源，经YJ4低电压继电器线圈至380V交流2路电源B相电源，YJ4低电压继电器励磁，YJ4抵电压继电器常闭接点，断开监控后台机信号“2路电源故障”信号回路，“2路电源故障”信号复归；When the k2 air switch is closed, the 380V AC 2-way power supply A-phase power supply passes through the YJ4 low-voltage relay coil to the 380V AC 2-way power supply phase B power supply, the YJ4 low-voltage relay is excited, and the YJ4 resistance voltage relay normally closed contact is disconnected for monitoring Background machine signal "2-way power failure" signal loop, "2-way power failure" signal reset;
交流环网由1路电源供电时异常情况：当1路电源失去时，c1交流接触器、YJ1、YJ2、YJ3低电压继电失磁，其常闭接点闭合，YJ1、YJ2、YJ3低电压继电失磁，其常闭接点闭合后，接通监控后台机信号“1路电源开路”、“2路电源开路”、“1路电源故障”信号回路，发出“1路电源开路”、“2路电源开路”、“1路电源故障”信号；c1交流接触器、YJ2低电压继电器常闭接点闭合后，使380V交流2路电源A相电源，经c2交流接触器线圈至c1交流接触器常闭接点、YJ2低电压继电器常闭接点，至380V交流2路电源B相电源，使c2交流接触器线圈回路接通励磁，c2交流接触器主常开触点闭合，接通2路电源，使交流环网恢复正常供电，YJ1、YJ2、YJ3低电压继电器励磁，其常闭接点断开监控后台机信号“1路电源开路”、“2路电源开路”、“1路电源故障”信号，“1路电源开路”、“2路电源开路”、“1路电源故障”自动复归；Abnormal situation when the AC ring network is powered by 1-way power supply: When 1-way power supply is lost, c1 AC contactor, YJ1, YJ2, YJ3 low-voltage relays lose their magnetism, their normally closed contacts close, and YJ1, YJ2, YJ3 low-voltage relays Electric demagnetization, after its normally closed contact is closed, connect the monitoring background machine signal "1 power supply open circuit", "2 power supply open circuit", "1 power supply failure" signal circuit, and send out "1 power supply open circuit", "2 power supply open circuit" After the c1 AC contactor and the normally closed contact of the YJ2 low-voltage relay are closed, the 380V AC 2-way power A-phase power supply passes through the coil of the c2 AC contactor to the c1 AC contactor. Close contact, YJ2 low-voltage relay normally closed contact, to 380V AC 2-way power supply B-phase power supply, make the coil circuit of c2 AC contactor turn on the excitation, c2 AC contactor main normally open contact close, turn on 2-way power supply, make The AC ring network resumes normal power supply, YJ1, YJ2, YJ3 low-voltage relays are excited, and their normally closed contacts are disconnected to monitor the background machine signals "1-way power supply open circuit", "2-way power supply open circuit", "1-way power supply failure" signal, " 1-way power supply open circuit", "2-way power supply open circuit", "1-way power supply failure" automatic reset;
当交流环网中的任意环网空气开关脱扣，YJ2低电压继电器失磁，其常闭接点闭合：When any ring network air switch in the AC ring network trips, the YJ2 low-voltage relay loses excitation, and its normally closed contact closes:
监控后台机发出“2路电源开路”信号；380V交流2路电源A相电源，经ZJ2低电压继电器线圈至YJ2低电压继电器常闭接点至P2复归按钮至380V交流2路电源B相电源，此时ZJ2低电压继电器励磁，其常开接点闭合，380V交流2路电源A相电源，经ZJ2中间继电器线圈至ZJ2中间继电器常开接点至P2复归按钮至380V交流2路电源B相电源，使ZJ2中间继电器实现自保持；The monitoring background machine sends out a signal of "2-way power supply open circuit"; 380V AC 2-way power supply A-phase power supply, through ZJ2 low-voltage relay coil to YJ2 low-voltage relay normally closed contact to P2 reset button to 380V AC 2-way power supply B-phase power supply, this When ZJ2 low-voltage relay is excited, its normally open contact is closed, 380V AC 2-way power supply A-phase power supply, through ZJ2 intermediate relay coil to ZJ2 intermediate relay normally open contact to P2 reset button to 380V AC 2-way power supply B-phase power, so that ZJ2 The intermediate relay realizes self-holding;
380V交流2路电源A相电源，经c2交流接触器线圈至YJ2低电压继电器常闭接点，至380V交流2路电源B相电源，c2交流接触器励磁，c2交流接触器主常开触点闭合，接通2路电源，使交流环网开路点至2路电源侧恢复供电，YJ2低电压继电器励磁，其常闭接点断开，由于ZJ2中间继电器自保持，所以监控后台机“2路电源开路”信号不能自动复归，以提醒运维人员环网中有断开点，以便及时检查处理，当环网回路断开点故障处理完毕后，应先拉开2路交流电源后，再合上开路点环网电源空气开关，恢复环网回路正常运行，如反之，先合开路点环网电源空气开关，将使交流Ⅰ、Ⅱ段母线将环网回路并列，将造成环网回路空气开关过负荷跳闸；380V AC 2-way power supply A-phase power supply, through c2 AC contactor coil to YJ2 low-voltage relay normally closed contact, to 380V AC 2-way power supply B-phase power supply, c2 AC contactor excitation, c2 AC contactor main normally open contact closed , turn on the 2-way power supply, restore the power supply from the open point of the AC ring network to the 2-way power supply side, the YJ2 low-voltage relay is excited, and its normally closed contact is disconnected. Since the ZJ2 intermediate relay is self-maintaining, the monitoring background machine "2-way power supply is open circuit "The signal cannot be reset automatically to remind the operation and maintenance personnel that there is a disconnection point in the ring network, so as to check and deal with it in time. Point the air switch of the ring network power supply to restore the normal operation of the ring network circuit. If the opposite is the case, first close the air switch of the point ring network power supply, which will make the AC section I and II busbars parallel the ring network circuit, which will cause the air switch of the ring network circuit to overload. trip;
正常运行情况如交流环网由1路电源供电时，首先合上k1空气开关，再合上k2空气开关；如想交流环网由2路电源供电时，首先合上k2空气开关，再合上k1空气开关，原理同上所述。In normal operation, if the AC ring network is powered by 1-way power supply, first turn on the k1 air switch, and then turn on the k2 air switch; if you want the AC ring network to be powered by 2-way power supply, first turn on the k2 air switch, and then turn on the K1 air switch, the principle is the same as above.
低压交流环网电源失去后，断路器储能电源失去，断路器无法正常储能，机构、端子箱等加热、驱潮装置不能正常工作。断路器无法正常储能，如信号回路异常，当压力降至闭锁值时，不能正确发出闭锁信号，遇有系统故障，重合闸闭锁时，断路器不能自动重合，分闸闭锁时造成断路器拒动越级。加热电源失去，冬季气温较低，造成断路器液压机构密封胶圈弹性降低，出现渗油、漏油、泄压等现象，当断路器动作时，极易造成密封胶圈损伤；驱潮电源失去，极易造成端子箱、机构箱端子排受潮，绝缘降低，甚至绝缘击穿，致使直流接地或短路，如发生直流两点接地极易造成开关误动；隔离开关操作电源失去，使隔离开关无法进行远方或就地电动操作；隔离开关操作电源在电动操作过程中失去，将造成拉弧时间过长，可能会造成设备损坏及电网事故的发生；After the low-voltage AC ring network power supply is lost, the energy storage power supply of the circuit breaker is lost, the circuit breaker cannot store energy normally, and the heating and tide driving devices such as the mechanism and terminal box cannot work normally. The circuit breaker cannot store energy normally. If the signal circuit is abnormal, when the pressure drops to the blocking value, the blocking signal cannot be sent out correctly. Leapfrogging. The heating power supply is lost, and the winter temperature is low, which causes the elasticity of the sealing rubber ring of the hydraulic mechanism of the circuit breaker to decrease, and phenomena such as oil leakage, oil leakage, and pressure relief occur. When the circuit breaker operates, the sealing rubber ring is easily damaged; the tide driving power is lost , it is very easy to cause the terminal box and the terminal block of the mechanism box to be damp, the insulation is lowered, or even the insulation is broken down, resulting in DC grounding or short circuit. If the DC two-point grounding occurs, it is easy to cause the switch to malfunction; Carry out remote or local electric operation; the power supply of the isolating switch is lost during electric operation, which will cause the arcing time to be too long, which may cause equipment damage and grid accidents;
在低压交流环网回路两端分别加装两个低电压继电器和一个中间继电器，实现对低压交流环网回路的电源监测及电源备投功能，并在测控装置增设低压交流环网回路失压监视信号回路及监控后台信号，使低压环网回路在运行中得到了实时监控，当交流环网电源失去电压或出现异常后，将会在第一时间发出相应信号，提醒监控人员，并通知运行维护人员进行及时检查、处理。Install two low-voltage relays and an intermediate relay at both ends of the low-voltage AC ring network circuit to realize the power monitoring and power backup function of the low-voltage AC ring network circuit, and add low-voltage AC ring network circuit voltage loss monitoring to the measurement and control device The signal circuit and monitoring background signal enable the low-voltage ring network circuit to be monitored in real time during operation. When the AC ring network power supply loses voltage or is abnormal, it will send a corresponding signal at the first time to remind the monitoring personnel and notify the operation and maintenance Personnel check and deal with it in a timely manner.
通过加装低压交流环网回路电源监测及电源备投装置，使交流环网失压的恢复时间由原来的最短30分钟，提高到1秒钟，即自投装置的固有动作时间，效果非常明显。从而能最大限度的避免，由于低压交流环网失压后，所造成的上述各种故障的发生。By adding a low-voltage AC ring network circuit power monitoring and power backup switching device, the recovery time of the AC ring network loss of voltage is increased from the original minimum of 30 minutes to 1 second, which is the inherent action time of the automatic switching device, and the effect is very obvious. . Thereby, the occurrence of the above-mentioned various faults caused by the loss of voltage of the low-voltage AC ring network can be avoided to the greatest extent.
本发明的优点：Advantages of the present invention:
在变电站低压交流环网电源失去后，备用电源会自动投入运行，同时发出故障信号，值班人员可根据后台机信号第一时间发现，确定故障范围，缩短了运行人员故障处理的时间及环网电源失电的时间，提高和保证了设备的安全可靠性运行能力。After the low-voltage AC ring network power supply of the substation is lost, the backup power supply will be put into operation automatically, and a fault signal will be sent at the same time. The personnel on duty can find out the fault area at the first time according to the signal of the background machine, and determine the scope of the fault, shortening the troubleshooting time of the operating personnel and the ring network power supply. The time of power failure improves and guarantees the safe and reliable operation capability of the equipment.
附图说明Description of drawings
下面结合附图及实施方式对本发明作进一步详细的说明：Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
图1为低压交流环网回路电源监测方法流程图；Fig. 1 is a flow chart of a method for monitoring a power source of a low-voltage AC ring network;
图2为低压交流环网电源监视、备投原理图一；Figure 2 is the schematic diagram 1 of low-voltage AC ring network power supply monitoring and backup;
图3为低压交流环网电源监视、备投原理图二。Figure 3 is the schematic diagram 2 of low-voltage AC ring network power supply monitoring and standby switching.
具体实施方式Detailed ways
实施例1Example 1
本实施例提供了一种低压交流环网回路电源监测方法，其特征在于：所述的低压交流环网回路电源监测方法为，在交流环网中加装备低压交流环网电源监视、备投装置：在交流环网回路两侧分别加装了两个低电压继电器和一个中间继电器，一个交流接触器，详见图2和图3。This embodiment provides a low-voltage AC ring network loop power monitoring method, which is characterized in that: the low-voltage AC ring network loop power monitoring method is to add a low-voltage AC ring network power monitoring and backup device to the AC ring network : Two low-voltage relays, an intermediate relay and an AC contactor are respectively installed on both sides of the AC ring network circuit, see Figure 2 and Figure 3 for details.
实现对交流环网回路的电源监控和备投功能，并在测控装置增设低压交流环网回路失压监视信号回路及监控后台信号，使低压环网回路在运行中得到了实时监控，当交流环网电源失去电压或出现异常后，自动投入备用电源，同时在第一时间发出相应信号，提醒监控人员，并通知运行维护人员进行及时检查、处理。Realize the power monitoring and standby switching functions of the AC ring network circuit, and add a low-voltage AC ring network circuit voltage loss monitoring signal circuit and monitoring background signal in the measurement and control device, so that the low-voltage ring network circuit can be monitored in real time during operation. When the network power supply loses voltage or is abnormal, it will automatically switch to the backup power supply, and at the same time send a corresponding signal at the first time to remind the monitoring personnel and notify the operation and maintenance personnel to check and deal with it in time.
所述的低压交流环网电源监视、备投工作原理：在环网回路未送电前，由于YJ1、YJ2低电压继电器在失磁状态，YJ1、YJ2、YJ3、YJ4抵电压继电器常闭接点闭合，监控后台机发出“1路电源开路”、“2路电源开路”、“1路电源故障”、“2路电源故障”信号；The working principle of the low-voltage AC ring network power supply monitoring and standby switching: before the ring network circuit is powered, because the YJ1 and YJ2 low-voltage relays are in the state of demagnetization, the normally closed contacts of the YJ1, YJ2, YJ3, and YJ4 contact voltage relays are closed , the monitoring background machine sends out signals of "1-way power supply open circuit", "2-way power supply open circuit", "1-way power supply failure", "2-way power supply failure" signals;
交流环网由1路电源供电正常运行：The AC ring network is powered by 1 power supply for normal operation:
如交流环网由1路电源供电时，首先合上k1空气开关，再合上k2空气开关；当合上k1空气开关后，380V交流1路电源A相电源，经c1交流接触器线圈至c2交流接触器常闭接点、YJ1低电压继电器常闭接点至380V交流1路电源B相电源，c1交流接触器励磁，主常开触点闭合，c1交流接触器常开接点闭合，c1交流接触器常闭接点断开，交流电源送至c2号交流接触器主常开触点处及环网回路所带各回路；c1交流接触器常开接点闭合，使380V交流1路电源A相电源，经c1交流接触器线圈、c1交流接触器常开接点至380V交流1路电源B相电源，c1交流接触器实现自保持，YJ1、YJ2低电压继电器励磁，经YJ1、YJ2抵电压继电器常闭接点断开监控后台机信号“1路电源开路”、“2路电源开路”信号回路，“1路电源开路”、“2路电源开路”信号复归；If the AC ring network is powered by 1-way power supply, first turn on the k1 air switch, and then turn on the k2 air switch; when the k1 air switch is turned on, the 380V AC 1-way power supply A-phase power supply passes through the c1 AC contactor coil to c2 AC contactor normally closed contact, YJ1 low voltage relay normally closed contact to 380V AC 1-way power supply B-phase power supply, c1 AC contactor excitation, main normally open contact closed, c1 AC contactor normally open contact closed, c1 AC contactor The normally closed contact is disconnected, and the AC power is sent to the main normally open contact of the AC contactor c2 and the loops of the ring network circuit; the normally open contact of the c1 AC contactor is closed, so that the 380V AC 1-way power supply A-phase power supply, through c1 AC contactor coil, c1 AC contactor normally open contact to 380V AC 1-way power supply B-phase power supply, c1 AC contactor realizes self-holding, YJ1, YJ2 low-voltage relay excitation, YJ1, YJ2 reach voltage relay normally closed contact breaks Open the monitoring background machine signal "1 power supply open circuit", "2 power supply open circuit" signal loop, "1 power supply open circuit", "2 power supply open circuit" signal return;
当合上k1空气开关后，380V交流1路电源A相电源至YJ3低电压继电器线圈至380V交流1路电源B相电源，YJ3低电压继电器励磁，YJ3抵电压继电器常闭接点断开监控后台机信号“1路电源故障”信号回路，“1路电源故障”信号复归；When the k1 air switch is closed, 380V AC 1-way power supply A-phase power supply to YJ3 low-voltage relay coil to 380V AC 1-way power supply B-phase power supply, YJ3 low-voltage relay excitation, YJ3 resistance voltage relay normally closed contact disconnected monitoring background machine Signal "1-way power failure" signal loop, "1-way power failure" signal reset;
当合上k2空气开关后，380V交流2路电源A相电源，经c2交流接触器线圈至c1交流接触器常闭接点、YJ2低电压继电器常闭接点，380V交流2路电源B相电源至c1交流接触器常闭接点，YJ1低电压继电器常闭接点，由于c1交流接触器常闭接点、YJ2低电压继电器常闭接点此时在开位，所以c2交流接触器线圈回路无法接通，不能励磁；When the k2 air switch is turned on, the 380V AC 2-way power supply, phase A, passes through the coil of the c2 AC contactor to the normally closed contact of the c1 AC contactor, the normally closed contact of the YJ2 low-voltage relay, and the 380V AC 2-way power supply to the B-phase power supply. The normally closed contact of c1 AC contactor and the normally closed contact of YJ1 low-voltage relay, because the normally closed contact of c1 AC contactor and the normally closed contact of YJ2 low-voltage relay are in the open position at this time, the coil circuit of c2 AC contactor cannot be connected. excitation;
当合上k2空气开关后，380V交流2路电源A相电源，经YJ4低电压继电器线圈至380V交流2路电源B相电源，YJ4低电压继电器励磁，YJ4抵电压继电器常闭接点，断开监控后台机信号“2路电源故障”信号回路，“2路电源故障”信号复归；When the k2 air switch is closed, the 380V AC 2-way power supply A-phase power supply passes through the YJ4 low-voltage relay coil to the 380V AC 2-way power supply phase B power supply, the YJ4 low-voltage relay is excited, and the YJ4 resistance voltage relay normally closed contact is disconnected for monitoring Background machine signal "2-way power failure" signal loop, "2-way power failure" signal reset;
交流环网由1路电源供电时异常情况：当1路电源失去时，c1交流接触器、YJ1、YJ2、YJ3低电压继电失磁，其常闭接点闭合，YJ1、YJ2、YJ3低电压继电失磁，其常闭接点闭合后，接通监控后台机信号“1路电源开路”、“2路电源开路”、“1路电源故障”信号回路，发出“1路电源开路”、“2路电源开路”、“1路电源故障”信号；c1交流接触器、YJ2低电压继电器常闭接点闭合后，使380V交流2路电源A相电源，经c2交流接触器线圈至c1交流接触器常闭接点、YJ2低电压继电器常闭接点，至380V交流2路电源B相电源，使c2交流接触器线圈回路接通励磁，c2交流接触器主常开触点闭合，接通2路电源，使交流环网恢复正常供电，YJ1、YJ2、YJ3低电压继电器励磁，其常闭接点断开监控后台机信号“1路电源开路”、“2路电源开路”、“1路电源故障”信号，“1路电源开路”、“2路电源开路”、“1路电源故障”自动复归；Abnormal situation when the AC ring network is powered by 1-way power supply: When 1-way power supply is lost, c1 AC contactor, YJ1, YJ2, YJ3 low-voltage relays lose their magnetism, their normally closed contacts close, and YJ1, YJ2, YJ3 low-voltage relays Electric demagnetization, after its normally closed contact is closed, connect the monitoring background machine signal "1 power supply open circuit", "2 power supply open circuit", "1 power supply failure" signal circuit, and send out "1 power supply open circuit", "2 power supply open circuit" After the c1 AC contactor and the normally closed contact of the YJ2 low-voltage relay are closed, the 380V AC 2-way power A-phase power supply passes through the coil of the c2 AC contactor to the c1 AC contactor. Close contact, YJ2 low-voltage relay normally closed contact, to 380V AC 2-way power supply B-phase power supply, make the coil circuit of c2 AC contactor turn on the excitation, c2 AC contactor main normally open contact close, turn on 2-way power supply, make The AC ring network resumes normal power supply, YJ1, YJ2, YJ3 low-voltage relays are excited, and their normally closed contacts are disconnected to monitor the background machine signals "1-way power supply open circuit", "2-way power supply open circuit", "1-way power supply failure" signal, " 1-way power supply open circuit", "2-way power supply open circuit", "1-way power supply failure" automatic reset;
当交流环网中的任意环网空气开关脱扣，YJ2低电压继电器失磁，其常闭接点闭合：When any ring network air switch in the AC ring network trips, the YJ2 low-voltage relay loses excitation, and its normally closed contact closes:
监控后台机发出“2路电源开路”信号；380V交流2路电源A相电源，经ZJ2低电压继电器线圈至YJ2低电压继电器常闭接点至P2复归按钮至380V交流2路电源B相电源，此时ZJ2低电压继电器励磁，其常开接点闭合，380V交流2路电源A相电源，经ZJ2中间继电器线圈至ZJ2中间继电器常开接点至P2复归按钮至380V交流2路电源B相电源，使ZJ2中间继电器实现自保持；The monitoring background machine sends out a signal of "2-way power supply open circuit"; 380V AC 2-way power supply A-phase power supply, through ZJ2 low-voltage relay coil to YJ2 low-voltage relay normally closed contact to P2 reset button to 380V AC 2-way power supply B-phase power supply, this When ZJ2 low-voltage relay is excited, its normally open contact is closed, 380V AC 2-way power supply A-phase power supply, through ZJ2 intermediate relay coil to ZJ2 intermediate relay normally open contact to P2 reset button to 380V AC 2-way power supply B-phase power, so that ZJ2 The intermediate relay realizes self-holding;
380V交流2路电源A相电源，经c2交流接触器线圈至YJ2低电压继电器常闭接点，至380V交流2路电源B相电源，c2交流接触器励磁，c2交流接触器主常开触点闭合，接通2路电源，使交流环网开路点至2路电源侧恢复供电，YJ2低电压继电器励磁，其常闭接点断开，由于ZJ2中间继电器自保持，所以监控后台机“2路电源开路”信号不能自动复归，以提醒运维人员环网中有断开点，以便及时检查处理，当环网回路断开点故障处理完毕后，应先拉开2路交流电源后，再合上开路点环网电源空气开关，恢复环网回路正常运行，如反之，先合开路点环网电源空气开关，将使交流Ⅰ、Ⅱ段母线将环网回路并列，将造成环网回路空气开关过负荷跳闸；380V AC 2-way power supply A-phase power supply, through c2 AC contactor coil to YJ2 low-voltage relay normally closed contact, to 380V AC 2-way power supply B-phase power supply, c2 AC contactor excitation, c2 AC contactor main normally open contact closed , turn on the 2-way power supply, restore the power supply from the open point of the AC ring network to the 2-way power supply side, the YJ2 low-voltage relay is excited, and its normally closed contact is disconnected. Since the ZJ2 intermediate relay is self-maintaining, the monitoring background machine "2-way power supply is open circuit "The signal cannot be reset automatically to remind the operation and maintenance personnel that there is a disconnection point in the ring network, so as to check and deal with it in time. Point the air switch of the ring network power supply to restore the normal operation of the ring network circuit. If the opposite is the case, first close the air switch of the point ring network power supply, which will make the AC section I and II busbars parallel the ring network circuit, which will cause the air switch of the ring network circuit to overload. trip;
正常运行情况如交流环网由1路电源供电时，首先合上k1空气开关，再合上k2空气开关；如想交流环网由2路电源供电时，首先合上k2空气开关，再合上k1空气开关，原理同上所述。In normal operation, if the AC ring network is powered by 1-way power supply, first turn on the k1 air switch, and then turn on the k2 air switch; if you want the AC ring network to be powered by 2-way power supply, first turn on the k2 air switch, and then turn on the K1 air switch, the principle is the same as above.
低压交流环网电源失去后，断路器储能电源失去，断路器无法正常储能，机构、端子箱等加热、驱潮装置不能正常工作。断路器无法正常储能，如信号回路异常，当压力降至闭锁值时，不能正确发出闭锁信号，遇有系统故障，重合闸闭锁时，断路器不能自动重合，分闸闭锁时造成断路器拒动越级。加热电源失去，冬季气温较低，造成断路器液压机构密封胶圈弹性降低，出现渗油、漏油、泄压等现象，当断路器动作时，极易造成密封胶圈损伤；驱潮电源失去，极易造成端子箱、机构箱端子排受潮，绝缘降低，甚至绝缘击穿，致使直流接地或短路，如发生直流两点接地极易造成开关误动；隔离开关操作电源失去，使隔离开关无法进行远方或就地电动操作；隔离开关操作电源在电动操作过程中失去，将造成拉弧时间过长，可能会造成设备损坏及电网事故的发生；After the low-voltage AC ring network power supply is lost, the energy storage power supply of the circuit breaker is lost, the circuit breaker cannot store energy normally, and the heating and tide driving devices such as the mechanism and terminal box cannot work normally. The circuit breaker cannot store energy normally. If the signal circuit is abnormal, when the pressure drops to the blocking value, the blocking signal cannot be sent out correctly. Leapfrogging. The heating power supply is lost, and the winter temperature is low, which causes the elasticity of the sealing rubber ring of the hydraulic mechanism of the circuit breaker to decrease, and phenomena such as oil leakage, oil leakage, and pressure relief occur. When the circuit breaker operates, the sealing rubber ring is easily damaged; the tide driving power is lost , it is very easy to cause the terminal box and the terminal block of the mechanism box to be damp, the insulation is lowered, or even the insulation is broken down, resulting in DC grounding or short circuit. If the DC two-point grounding occurs, it is easy to cause the switch to malfunction; Carry out remote or local electric operation; the power supply of the isolating switch is lost during electric operation, which will cause the arcing time to be too long, which may cause equipment damage and grid accidents;
在低压交流环网回路两端分别加装两个低电压继电器和一个中间继电器，实现对低压交流环网回路的电源监测及电源备投功能，并在测控装置增设低压交流环网回路失压监视信号回路及监控后台信号，使低压环网回路在运行中得到了实时监控，当交流环网电源失去电压或出现异常后，将会在第一时间发出相应信号，提醒监控人员，并通知运行维护人员进行及时检查、处理。Install two low-voltage relays and an intermediate relay at both ends of the low-voltage AC ring network circuit to realize the power monitoring and power backup function of the low-voltage AC ring network circuit, and add low-voltage AC ring network circuit voltage loss monitoring to the measurement and control device The signal circuit and monitoring background signal enable the low-voltage ring network circuit to be monitored in real time during operation. When the AC ring network power supply loses voltage or is abnormal, it will send a corresponding signal at the first time to remind the monitoring personnel and notify the operation and maintenance Personnel check and deal with it in a timely manner.
通过加装低压交流环网回路电源监测及电源备投装置，使交流环网失压的恢复时间由原来的最短30分钟，提高到1秒钟，即自投装置的固有动作时间，效果非常明显。从而能最大限度的避免，由于低压交流环网失压后，所造成的上述各种故障的发生。By adding a low-voltage AC ring network circuit power monitoring and power backup switching device, the recovery time of the AC ring network loss of voltage is increased from the original minimum of 30 minutes to 1 second, which is the inherent action time of the automatic switching device, and the effect is very obvious. . Thereby, the occurrence of the above-mentioned various faults caused by the loss of voltage of the low-voltage AC ring network can be avoided to the greatest extent.
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