Substation Control screen control handle loop problems and improvement of traffic lights

           Tianjin Electric Power Company high voltage power supply company (Tianjin 300250) Chen Bai Yonglei Abstract fully mechanized from the substation control panel open and close indicator circuit design problems caused by unreasonable conduct elaborated by two schematic comparison analysis, the improvements through two detailed examples of specific improvements and methods of operation.

 

Key words substation; monitoring system; traffic light circuit; Anti measures

 

          0 Introduction With the computer, networking and communications technology and the rapid development of the power system in the wide application of the technical level of substation monitoring system is rapidly improving, substation automation control means controlled by conventional means evolved in its transition in the process, many of the design concept also can see the shadow of conventional means of control. But with the changes in technology and the environment, in actual operation, we found a simple conversion of individual technical aspects of the safe operation of the system has been unable to meet the needs, particularly due to the presence of the misunderstanding has led to a number of problems. For example, in the conventional control switch points closing substation to monitor status and integrity of the control loop in the control panel on the design of traffic lights and their associated circuit design in the substation integrated automation to achieve after the loop intact transferred to the control screen , has led to a number of problems.

 

     An open and close indicator circuit design problems caused by unreasonable Currently, 220kV and above substations have achieved comprehensive self-monitoring system design, as a routine traffic lights on the control panel and its associated circuits in the monitoring system has been inherited and preserved. These substations generally controls on the control panel on the handlebars reserved for monitoring sub-closing loop integrity of the state and the type of closing instructions diode traffic lights to replace the traditional traffic lights on the control panel. According to the traditional design ideas lineage, many units will be designed to handle the signal loops KK directly connected to the switch control circuit, circuit diagram, such as "Figure 1" shows, in order to reflect the switch operating status.

 

       This control of opening and closing the handle relative to traditional light indication circuit compact, but I recently found at the scene in some individual mechanized system uses a self-produced N2 type KK handle (the original bulk of the company improved version of the old model, intended for the integration of design and reduces the space occupied by the handle KK), there have been damaged several times due to the traffic light control power supply circuit and cause a jump, causing loss of control power switch serious consequences. In the damaged lamp replacement process if control power cut will affect the protection device to protect against switch tripping off the power if the replacement will keep the risk of malfunction, the safe operation of the device caused the problems, but also makes it difficult for maintenance work.

After the analysis of the phenomenon, to identify the reasons for the company's personnel handle the signal circuit design for field use conditions limiting case of lack of understanding, lights and power resistor circuit design margin is small, long-term use can lead to resistance heat larger even burn causing a short circuit. Once the burn will trigger signal circuit resistance short circuit, causing the control circuit power supply circuit tripping, if loss of power in the loop during the system failure then causes the switch tripping, and in severe cases may also lead to short-circuit switch malfunction. This circuit design approach for security risks exist, we must take measures to improve it.

 

        2 points off indicator improved circuit design thinking for such situations, we carefully analyze that this traditional circuit design approach has not fully adapted to the current situation, while on the screen by using the remote control power supply replaces the letter simple way to control power, the "Figure 2" shows a circuit instead of the original loop. Figure 1 and Figure 2 by the two graphs of comparison, it can be seen that the main change is the traffic light circuit is powered by the signal over the bus control bus KM XM, while the corresponding wiring for small changes. Although the improvement is simple, but the role played by very large. Because in normal operating conditions have been able to reflect TWJ HWJ and control the power state so that the lights only by improving the closing state of the ability to monitor and control the integrity of the loop, the conventional design approach is to monitor the content, better able to run officers patrol through the traffic lights to signal status monitor intuitive power supply is normal. And usually, designed to monitor the signal (remote communication) power is usually to be taken: (1) adjacent to each other to monitor and control devices; (2) positively charged directly shorted to the remote signal to open the way into and monitored negated ; (3) remote signaling and control devices to share power, through self-monitoring device information communication disruption to indirectly judge. But this can only be three ways to be judged by the background information, through improvements in the way in Figure 2 makes more of a judgment attendant power failure telesignalling ways to enhance the safe operation of equipment reliability. You can also bring the following benefits (a) does not affect the traffic light circuit conditions control power switch, which does not affect the switch tripping; (2) easy to replace and deal with failure, maintenance, safer and more convenient.

 

      3 Execute points closing indicator circuit improvements for individual instances of the actual operation of the substation control panel lights short circuit occurred in the control power tripping caused by faults in my company for an entire transport equipment for a serious investigation and counter-measures specially formulated, induction were taken the following three ways: (1) contact with supply manufacturers provide safety made a great improvement on the performance of the new light board to be put into operation on the part of the device to be replaced; (2) will control the power supply to remote communication ; (3) can not be charged for the operation of the substation equipment replacement lights loop jump take temporary measures, to be replaced when conditions are ripe.

 

      3.1 Control power supply instead of the actual operation of remote communication instance instance of the operation is to "Figure 3" Connection to "4" in the wiring form. Since the traffic lights and the positively charged side KK + are connected to the switch control positive J101 (+ KM), it needs to be traffic lights junction by the positively charged side KK + J101 to telesignalling positive + XM, and to protect the operator received a box requires a new Pieces wire core to - XM negatively charged as HWJ and TWJ provide negative, then you need to add a control panel and the protective screen between the wire core operating box, if you have a spare original cable core, simply enable the cable to a spare core, check out the spare cores, by the negative control remote signaling box provided to protect the operator TWJ and HWJ, while the traffic light loop J135 and J105 without changes. Of course, if the new release cable is clearly more wasteful and brought a greater workload, some more harm than good.

 

       3.2 Temporary lights loop to pick the actual operation of the substation examples from the comprehensive surveillance monitoring backstage operating personnel is the main traffic lights on the control panel's role has been greatly reduced, so pick open temporary traffic lights loop does not bring too much to run big impact. So for some unmanned substation control and protection of the operator panel screen cable between no spare cores could be considered temporary cancellation loop control panel lights, but must ensure that demolition demolition wiring check the correct wiring. For example, from Figure 3, when the switch is in position when combined, HWJ closed, J135 circuit negatively charged, TWJ open, J105 and J101 equipotential positively charged, in this case, the circuit for the red technical measures: the multimeter Monitoring and control panel terminal block J135 voltage is negative electricity, the protection operation box screen pick open J135 wiring, the multimeter to the voltage can be monitored by the negative becomes positive, the ends can be outside the mouth J135 Control panel wiring and do pick open good insulation measures. Technical measures for the green loop: Using a multimeter monitor screen to protect the operator terminal block box J105 is positively charged, the control panel terminal block wiring pick open J105 multimeter to positive changes can be monitored without electricity, you can control both ends of the screen J105 wiring outside the mouth to pick apart and well insulated measures. And so on, can be used when the switch is in sub-bit line of this method of nuclear stitches. For the protection of the operation box, the J135 and J105 only need to remove two cores and well insulated can, for purposes of monitoring screen, you need to pick open lights positively KK + wiring, the wiring normally associated with switch control positive J101 and connected to the terminal block, terminal block can monitor the traffic lights junction J135 or J105 wiring position is positive (assuming that the J135 and J105 have pick open), pick open KK +, then the monitor to positively change without electricity , remove the cores and well insulated can.

 

      4 Conclusion

 

     Through the above analysis we can see, the problem occurs due to defects in the product design and quality lead, but further thought, we can see that we are in the process of designing circuit ignores changes in the environment, there is a certain inertia of thinking. This work is still in progress against measures through discussion and exchange needs a better way to solve problems, to ensure the safe operation of substation equipment.

 

    About the author:

 

    Fu Baojun (1973 -), male, political division, mainly engaged in energy metering work.