CN103475104A - Unlocking screen for misoperation-preventive locking system of integrated automation substation - Google Patents

Abstract

The invention relates to an unlocking screen of an anti-misoperation locking system of a comprehensive automated substation. On the basis of the existing integrated automation equipment using a monitoring and anti-mistake system, a slightly modified one is added to the interval layer of the substation automation system. An unlocking operation screen, on the screen Set a one-to-one corresponding "interlock" and "unlock" two-position key for each measurement and control device that is locked across intervals in the station, and its position status (interlock or unlock) is entered into the screen as a group of two-position remote signals Unlock the measurement and control unit, and use the remote signal as a new condition to participate in the five-defense logic judgment of related equipment. By adding the unlocking screen of the substation anti-malfunction operating system to the substation anti-malfunction system, it can not only solve the acceptance problem in the reconstruction and expansion project and the mixed use of new and old anti-malfunction systems in the process of comprehensive automatic transformation of the substation, but also reduce the switching operation process The frequency of unlock operations in .

Description

Unlocking screen of anti-misoperation locking system in integrated automation substation

technical field

The invention relates to an unlocking screen of an anti-misoperation locking system of a comprehensive automatic substation.

Background technique

At present, the anti-misoperation system of substation mostly adopts the anti-misoperation system form of "logic locking + electrical locking of computer monitoring system" to realize the perfect anti-misoperation locking function within and between stations. In the actual operation process, on the one hand, with the increase in the number of automation equipment and the increase in operating life, the frequency of problems with automation equipment, especially bay layer equipment, or equipment remote signaling auxiliary contacts is gradually increasing; on the other hand, substation changes, Expansion projects, especially the comprehensive automation transformation of substations are also gradually increasing, and the reconstruction and expansion projects need to verify the correctness of the closed circuit. Since the monitoring lock has a complete station-wide logical locking function, the monitoring and anti-mistake system is a station-wide logic, and there is a problem of crossing intervals. Once the above two situations occur, either the associated compartment equipment will not be able to operate normally, and you can only apply for unlocking operation; or due to the impact of the power outage, the five-proof locking of the expansion compartment or comprehensive self-retrofitting compartment cannot be completely verified (theoretically, usually Use short wires to short-circuit the terminals behind the monitoring and control screen of the running equipment to realize the remote signal displacement of the running equipment, but the risk of misoperation is also very high, and the general on-duty staff dare not do this for the sake of caution), leaving potential safety hazards for future operation management .

Figure 1 is a schematic diagram of a typical knife switch operation circuit. In the figure, LD is the remote control switch of the knife switch, PC and PO are the close control operation buttons of the knife switch, and L is the electromagnetic lock for manual operation of the knife switch.

Among them, the computer monitoring system has a complete station-wide logical locking function. In addition to judging the locking conditions of the electrical circuit in this compartment, it must also discriminate other inter-interval related locking conditions; the local electrical locking is slightly different due to different primary equipment. The difference is that for open equipment, it is the electrical lock of the equipment compartment; for combined electrical equipment, it is a complete electrical lock. Therefore, the bay layer automation equipment is the center of the anti-misoperation locking of the substation, and it should be avoided that the measurement, control and anti-misoperation system is out of operation.

It can be seen from the figure that whether it is electric operation or manual operation in the knife switch mechanism box, or remote control operation on remote measurement and control or monitoring computer, it must meet the locking condition of "logic locking + electrical locking of computer monitoring system" at the same time .

During the current operation, when the electrical lock is abnormal, it can be unlocked by the electrical unlocking key alone; similarly, when the measurement and control unit is abnormal, it can be unlocked by the measurement and control unlocking key (divided into two types: hard contact unlocking and logic unlocking).

According to the traditional design, when there is a problem with the electrical misoperation prevention system or the measurement and control misoperation prevention system, when the operation cannot continue smoothly, the unlocking operation is required, which will gradually increase the frequency of substation unlocking operations, and the anti misoperation locking device is to prevent misoperation. Once the important technical means fail, the switching operation will lose the last line of defense. Statistics show that most misoperations occur when the function of the anti-misoperation system is missing. Therefore, measures should be taken to reduce the frequency and scope of unlocking operations, which can be achieved by unlocking the screen of the substation anti-misoperation operating system.

At the same time, in the reconstruction and expansion project, once the construction of the primary and secondary equipment is not synchronized, the acceptance of the anti-mistake locking system will not be implemented smoothly, which in turn will cause incomplete acceptance of the anti-mistake system, and the increase in hidden dangers will lead to further increase in unlocking operations , thereby reducing the position of the error prevention system in the minds of operation and maintenance personnel, making it easier for misoperations to occur.

Contents of the invention

In order to overcome the above deficiencies, the present invention provides an integrated automatic substation error prevention operating system unlocking screen. By adding the substation error prevention operating system unlocking screen in the substation error prevention system, it can not only solve the acceptance problem in the reconstruction and expansion project, but also Reduce the frequency of unlocking operations during switching operations.

Main technical content of the present invention is as follows:

On the basis of the existing comprehensive automation equipment using the monitoring and error prevention system, a slight modification can be made to solve the above problems by adding a set of measurement and control equipment at the interval layer. An unlocking operation screen is installed on the compartment layer of the substation automation system. On the unlocking operation screen, a one-to-one corresponding "interlocking" and "unlocking" double-position key is set for each measurement and control device that is inter-interval locked in the station. The position status (Interlocking or unlocking) As a group of two-position remote signaling, enter the unlocking operation screen to unlock the measurement and control unit, and use the remote signaling as a new condition to participate in the five-defense logic judgment of related equipment. Under normal circumstances, the corresponding keys on the unlocking screens of all compartments in the substation are placed in the "interlock" position. At this time, all devices participate in the inter-interval locking logic judgment of other devices according to their real status; when the corresponding key of a certain compartment is placed in the "unlock" position state, the switching operation of the equipment that has a locking relationship with it is not affected by the status of the unlocking interval equipment, only the remote signaling status of other equipment in the locking condition needs to be judged. In other words, the above problems can be solved by operating the unlock key on the screen: when the unlock key of the corresponding unit in the screen cabinet is in the "interlock" position, the logic lock of the related equipment is judged according to the normal logic; When the unlocking key of a certain unit is in the "unlocked" position, the status of the device to be unlocked is not considered when the device that has a locking relationship with it makes a logical locking judgment The five anti-blocking logic conditions, regardless of its actual state), only need to judge the remote signaling status of other devices in the blocking condition.

However, it should be pointed out that when the key is switched to the "unlock" position, it will not affect the collection and execution of remote signaling, remote control and telemetry signals of the corresponding measurement and control device of the key, but only affect the judgment of the five defense logic of the associated unit equipment.

By virtue of the above technical solutions, the present invention has at least the following advantages:

According to Jiangsu Electric Power Company's "Guiding Opinions on the Implementation of Substation Misoperation Prevention Operating System Transformation", the goal of substation misoperation prevention operating system transformation is to have the functions of the misoperation prevention system specified in the provincial company's "Substation Misoperation Prevention Technical Regulations", that is, to adopt "computer monitoring system ＋Electrical lock" anti-mistake system form. The operation interruption and unlocking caused by the abnormality of the measurement and control unit, the acceptance problems and operation management problems that are often encountered in the reconstruction and expansion projects and the longitudinal transformation are common problems in the monitoring and error prevention system. The substation unlocking operation panel can reduce the frequency and scope of substation unlocking operations, reduce dangerous points in reconstruction and expansion projects, and greatly reduce the possibility of misoperation during switching operations. It can be vigorously promoted in substations of various voltage levels.

The unlocking screen of the substation anti-misoperation operating system has been used in multiple 500 kV substations in Suzhou, and has played a huge role in the comprehensive automation transformation of substations, substation reconstruction and expansion projects, and daily operation. When the measurement and control unit or remote signaling is abnormal, it can reduce the frequency of unlocking operations; in the reconstruction and expansion project, it can make the acceptance more comprehensive and detailed; in the transformation of substation comprehensive automation, it can solve two sets of problems. Management troubles when locking systems are operated in parallel.

The specific embodiment of the present invention is given in detail by the following examples and accompanying drawings.

Description of drawings

Figure 1 is a schematic diagram of substation monitoring and error prevention;

Figure 2 is a block diagram of the integrated automation substation system;

Figure 3 is a diagram of the locking relationship of the main female knife switch of the bus coupler 25301 before the unlocking screen is installed in the embodiment;

Fig. 4 is a diagram showing the locking relationship of the bus coupler 25301 main female knife switch after the unlocking screen is installed in the embodiment.

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, features and effects of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. back.

As shown in Figure 2, the substation integrated automation system includes the station control layer monitoring system, the main unit, the bay layer measurement and control unit, field equipment, and the anti-misoperation locking module integrated in the entire system. Network connection, the main control unit is connected to the station control layer monitoring system through the power data network, the field equipment includes switches, knife gates, and the network door that can return to the blocking node, the position of the ground wire equipment, and the blocking node is connected through the electrical wiring of the field equipment , to realize the locking of field equipment;

The station control layer monitoring system operates with a station control layer logic blocking module, and the interval layer measurement and control unit operates with an interval layer logic blocking module. The incomplete electrical blocking module of this interval and the mechanical blocking module between the knife switch and the ground knife are integrated into the field equipment. . The measurement and control unit of the bay layer is configured according to the switch, and the main unit adopts A and B dual-machine backup mode.

This situation is often encountered in actual work. As we all know, there are many inter-interval lockouts in substations. For example, the operation of the busbar switch needs to judge the status of the busbar grounding switch; The reverse operation needs to judge the status of the bus coupler interval equipment and so on. As a bay layer logic block with a complete block function of the whole station, once the relevant interval measurement remote signal is abnormal, the equipment involved in the remote signal in the blocking condition cannot operate normally.

There are many reasons for abnormal remote signaling, and the more common ones are as follows:

1) The measurement and control unit is abnormal, including communication interruption, sampling board, power board and other components abnormality, etc.;

2) Switches, switches and other equipment are abnormal in remote signaling due to improper contacts, loose terminals, moisture, etc.;

3) During the renovation and expansion project, the state of the equipment cannot be changed due to the scope of the power outage, but the state needs to be changed during the acceptance process, etc.;

4) In the process of comprehensive automation transformation, the transformation of the equipment has not been completed, and the remote signal status of the equipment has not been entered into the automation system, but it affects the switching operation and acceptance of the transformed equipment.

Of course, if the above problems are normal switching operations, all can be solved by unlocking operations; if it is acceptance, it is easier to give up verification. However, it must be pointed out that the former increases risks, and the higher the frequency of unlocking operations, the higher the probability of habitual violations; the latter avoids risks, leaving behind hidden dangers and increasing difficulties for future operation and management.

The invention provides an unlocking screen for an integrated automatic substation anti-misoperation operating system. A group of unlocking operation screens is added between the measurement and control units of the interval layer. The unlocking operation screen is a remote signal acquisition board; The measurement and control device is equipped with a one-to-one corresponding "interlock" and "unlock" two-position key. A new condition is involved in the five-defense logic judgment of related equipment. Under normal circumstances, the corresponding keys on the unlocking screens of all compartments in the substation are placed in the "interlock" position. At this time, all devices participate in the inter-interval locking logic judgment of other devices according to their real status; when the corresponding key of a certain compartment is placed in the "unlock" position state, the switching operation of the equipment that has a locking relationship with it is not affected by the status of the unlocking interval equipment, only the remote signaling status of other equipment in the locking condition needs to be judged. In other words, the above problems can be solved by operating the unlock key on the screen: when the unlock key of the corresponding unit in the screen cabinet is in the "interlock" position, the logic lock of the related equipment is judged according to the normal logic; When the unlocking key of a certain unit is in the "unlocked" position, the status of the device to be unlocked is not considered when the device that has a locking relationship with it makes a logical locking judgment The five anti-blocking logic conditions, regardless of its actual state), only need to judge the remote signaling status of other devices in the blocking condition.

It should be noted that the installation of the unlocking screen cannot completely avoid the use of the unlocking key, but can only reduce its frequency of use, or narrow the scope of unlocking. Because there is an abnormality in the measurement and control unit of this compartment or an abnormality in the electrical lock of the compartment, there is no way to avoid it, and only the unlocking operation can be performed. However, if the operation of the interval device is affected due to an abnormality in the associated interval measurement and control unit or remote signaling, then the lock can be avoided by using the unlock screen.

However, it should be pointed out that when the key is switched to the "unlock" position, it will not affect the collection and execution of remote signaling, remote control and telemetry signals of the corresponding measurement and control device of the key, but only affect the judgment of the five defense logic of the associated unit equipment.

Example

The following takes the bus tie switch knife switch 25301 as an example in the dual-bus wiring mode with a relatively simple locking relationship to illustrate its principle. Figure 3 is the five-proof locking logic diagram of the bus tie switch (2530 is the number of the bus tie switch, 253047 and 253048 are the grounding switch of the bus tie switch, and 220411 is the grounding switch of the positive busbar), and Figure 4 is the installation Locking logic diagram behind the unlock screen (the "main bus compartment unlock" and "main bus compartment interlock" respectively correspond to the unlock key status of the main bus compartment on the unlock screen).

It can be seen from the figure that under normal circumstances, the bus coupler interval unlock key on the unlock screen is in the "interlock" state, and the locking logic of the 25301 knife switch is normal logic; Judging that the five-proof logic of the 24301 knife switch is not satisfied, the operation cannot be carried out normally; if the unlock key corresponding to the positive bus interval on the unlock screen is switched from the "interlock" position to the "unlock" position, the operation can be carried out normally. At this time, although there is no need to judge the status of the busbar ground knife in the blocking condition, other conditions need to be judged normally.

The added unlocking screen itself does not directly release the blocking of a certain compartment, but only releases the impact of abnormal remote signaling equipment on other normal equipment. For equipment with remote signaling abnormalities, the status can be confirmed through the multi-method required in the "Electricity Safety Work Regulations" to ensure the correctness of operation.

In actual operation, the introduction of the unlock screen can play a huge role. When the measurement and control unit or remote signaling is abnormal, it can reduce the frequency of unlocking operations; in the reconstruction and expansion project, it can make the acceptance more comprehensive and detailed; in the transformation of substation comprehensive automation, it can solve two sets of problems. Management troubles when locking systems are operated in parallel.

Case 1: Application in substation thermal busbar

In a 500 kV substation, the 220 kV 4X32 line was switched from the 220 kV Ⅰ busbar to the 220 kV Ⅱ busbar. When the 4X321 knife switch was opened, the knife switch could not be operated. After inspection, it was found that it was the bus tie The state of the 25301 bus tie switch I bus switch in the switch interval is uncertain (in an intermediate state, that is, neither in the split position nor in the close position).

Among them, the closing conditions of 220 kV I bus 4X321 are: 4X322 closing position, 220 kV I II bus tie 2530 switch closing position, 25301 bus tie switch I bus knife switch closing position, 25302 bus tie switch II The closing position of the female switch, the opening position of the 4X32 switch grounding switch 4X3244 and 4X3246, the opening position of the 220 kV I female grounding switch 220411.

If the operator cannot rule out the abnormality within a short period of time, there are two choices at this time: one is to directly apply for unlocking and unlock the measurement and control unit. Since the 220 kV system of the substation is a combined electrical appliance (hereinafter referred to as "GIS") equipment, the on-duty personnel cannot directly see whether the switch of the interval busbar is in place, and there have been cases in the system where the busbar of the GIS equipment was thermally reversed due to the failure of the busbar II The brake is not closed in place and the I mother knife switch is pulled open, and there is a misoperation of pulling the knife switch with load. Therefore, the operator on duty is not sure about the direct unlocking operation, and he has to take a certain risk; another option is to wait for the maintenance personnel to come and rule out the abnormality. The substation is an hour's drive from the urban area, plus the preparation time, it is estimated that it will take two hours to wait. So neither option is perfect.

After installing the unlock screen, all problems are solved. First of all, by observing the current passing through the bus coupler interval, the remote signal status of the on-site knife switch, and the mechanical indication, it can be confirmed that the bus coupler interval switch and the knife switch are all in the closing position, and it can be determined that the problem is caused by the vibration of the secondary auxiliary contact. caused by the exception. Secondly, it is only necessary to switch the unlocking key corresponding to the 220 kV Ⅰ Ⅱ bus tie 2530 switch measurement and control device on the unlocking operation screen from the "interlock" state to the "unlock" position. At this time, the 4X321 allows the closing condition to exclude the bus tie interval Judgment of switch and knife status, but the system also needs to confirm the closing position of 4X322, the opening position of 4X3244, the opening position of 4X3246, and the opening position of 220411. At this time, the conditions that can determine the state and cause abnormal operation are eliminated, and the operation can continue.

Case 2: Application in the transformation process of substation comprehensive automation

As we all know, in the transformation process of the total substation automation system of the substation, it is inevitable to face the situation that some equipment has been transformed, while the transformation of other equipment is in progress or to be completed. For those bays that have not completed the automation transformation, the primary equipment remote signaling signal cannot be uploaded to the station control layer equipment, which will definitely affect the switching operation of those devices that have inter-bay blocking.

Taking the case mentioned above as an example, if the automation transformation of the bus coupler bay has not been completed, and the transformation of the 220 kV Shushang 4X32 line bay has been completed, then the hot reverse operation at this time will also face the problem of "unlocking". After installing the unlocking screen cabinet, the problem can be solved easily. Before the transformation, the logic library of the whole station can be set according to the logic conditions after the complete transformation is completed, and at the same time, the unlock key corresponding to the interval of the transformation not completed on the unlock screen is switched to the "unlock" position, and the transformation is completed. interlock" position. In this way, the previous switching operation can still be carried out normally. For the equipment that has been transformed, implement the new five-proof locking system; for the equipment that has not been transformed, implement the old five-proof locking system (most of them are microcomputer five-proof systems).

Case 3: Application in Substation Reconstruction and Expansion Project

Taking the common double-bus connection method as an example, the expansion line interval of the substation, because of the addition of a new interval, the blocking condition of the bus grounding switch will change. Since the blocking condition of the busbar grounding switch requires that the busbar switch of this section of all lines on the bus be in the opening position, but these lines are all in the running state and there will be no chance of power failure, so the blocking condition is difficult to fully verify. However, this problem is not difficult to solve through the unlock key on the unlock screen.

During the verification, the section of the busbar should be in a decommissioned state. Except for the running equipment, other equipment (such as expansion interval equipment, pressure transformer switch, etc.) in the blocking condition of the busbar grounding knife switch can be used for on-site operation and cooperation. First, switch the unlocking keys corresponding to all the running lines on the unlocking screen to the "unlock" position, and operate other equipment to the state that meets the locking conditions of the busbar ground switch to verify that the busbar ground switch can be opened and closed; then, turn the unlocking screen Switch the unlocking key corresponding to the upper running line to the "interlock" position, and verify one by one that the busbar grounding switch is locked when the line busbar switch is in operation, and the busbar grounding switch cannot be opened or closed.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solutions of the present invention.

Claims (1)

1. the anti-error locking system screen-unblocking of an integrated automation converting station, it is characterized in that: at the existing electric substation automation system wall of the synthetic automatic device of monitoring anti-error system that adopts, install a unlocking operation screen additional, described unlocking operation screen is upper for existing each measure and control device across the interval locking that " interlocking " and " release " two-position key one to one is set in station, the location status of described interlocking or release is opened into release measurement and control unit in the unlocking operation screen as one group of two-position remote signalling, described remote signalling is participated in to the five prevention logic judgement of relevant device, under normal circumstances, key corresponding on transformer station's all intervals screen-unblocking all is placed in " interlocking " position, and now all devices participates in judging across the interval latching logic of miscellaneous equipment according to its time of day, when the corresponding key in certain interval is placed in " release " state, there is with it the grid switching operation of the equipment of latching relation not to be subject to the impact of this release interval equipment state, only need the remote signalling state of miscellaneous equipment in the judgement barring condition.

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