CN107918430B - Direct-current control protection device for realizing on-line maintenance of switching value loop - Google Patents
Direct-current control protection device for realizing on-line maintenance of switching value loop Download PDFInfo
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- CN107918430B CN107918430B CN201711281830.6A CN201711281830A CN107918430B CN 107918430 B CN107918430 B CN 107918430B CN 201711281830 A CN201711281830 A CN 201711281830A CN 107918430 B CN107918430 B CN 107918430B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
The invention discloses a direct current control protection device for realizing on-line maintenance of a switching value loop, which comprises a switch, a disconnecting link device switching-off position contact, a switch, a disconnecting link device switching-on position contact, a device operation primary detection module, a device operation state input control module and a direct current control protection device. The device comprises a device operation primary detection module, a device operation state input control module, a direct current control protection device, a direct current switch type device opening and closing position information, a direct current control protection device and a direct current control protection device.
Description
Technical Field
The invention relates to the field of direct current control protection of electrical engineering, in particular to a direct current control protection device for realizing on-line maintenance of a switching value loop.
Background
The high-voltage and extra-high-voltage direct current transmission is a transmission mode that three-phase alternating current is rectified into direct current through a converter station, and then is transmitted to another converter station through a direct current transmission line to be inverted into three-phase alternating current. Compared with the alternating current transmission engineering, the direct current transmission has the advantages of low line cost, small running electric energy loss, obvious transmission energy saving effect, high adjustment speed, high running reliability and the like. Because the transmission capacity of the direct current transmission system is large, abnormal DC blocking can cause adverse effects on safe and stable operation of a power grid at a transmitting end and a receiving end, so that the reliability of DC operation is improved to the greatest extent, hidden danger of blocking the direct current transmission system is eliminated, the reliability of power supply can be improved, and the stability of the power grid can be improved.
The safe and stable operation of the direct current control protection system is a necessary condition for ensuring the normal operation of the direct current transmission system, and unlike the alternating current control protection system, the direct current control protection system needs to adopt the opening and closing position information of a direct current field switch and a disconnecting link, if the state information input loop faults of the switch and the disconnecting link directly cause the misoperation or refusal of the direct current control protection device, the abnormal locking of the direct current system is further caused, so that the improvement of the reliability of the switching value loop of the switch equipment and the efficient and safe elimination of the switching value loop faults are of great importance. At present, two schemes are generally adopted in engineering to overhaul and maintain a direct current switching value loop, one is to exit a direct current control protection device related to a fault loop and to perform inspection treatment on an abnormal loop after isolating the fault loop; another solution is to perform fault checking after isolating the fault loop and setting the number in the dc control protection program related to the fault loop. For the first scheme, at least one set of direct current control protection system is needed to be withdrawn in actual conditions, so that the reliability of the direct current control protection device is reduced, and meanwhile, the risk of direct current abnormal locking caused by the loss of the direct current control protection system is greatly increased; for the second scheme, as software setting work is required to be carried out, the risk brought by misoperation and missing operation of personnel is increased, and the fault handling efficiency is greatly reduced. In addition, the existing two fault processing modes can not completely solve the problems of misoperation and refusal of the direct current control protection system caused by misoperation and the like during personnel fault processing and overhaul and maintenance, and can not really realize on-line overhaul and maintenance of a switching value loop.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a direct current control protection device for realizing on-line maintenance of a switching value loop, so as to solve the problem of reduced reliability of the direct current control protection device caused by abnormality of a switching value input loop of primary equipment and avoid the hidden trouble of misoperation and refusal of the direct current control protection device caused by abnormality of maintenance of the switching value input loop.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a direct current control protection device for realizing on-line maintenance of a switching value loop comprises a switch, a disconnecting link device disconnecting link position contact, a switch, a disconnecting link device closing position contact, a device operation primary detection module, a device operation state input control module and a direct current control protection device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the device operation primary detection module comprises a first NOT gate logic unit, a first AND gate logic unit, a second NOT gate logic unit, a second AND gate logic unit, an exclusive OR gate logic unit and a switch and disconnecting link device position information normal indicator; the signal output ends of the switch and disconnecting link equipment disconnecting link position contacts are respectively connected with the signal input ends of the first AND gate logic unit and the second NOT gate logic unit; the signal output ends of the switching-on position contacts of the switch and the disconnecting link equipment are respectively connected with the signal input ends of the first NOT gate logic unit and the second AND gate logic unit; the signal output end of the second NOT gate logic unit is connected with the signal input end of the second AND gate logic unit, the signal output end of the first NOT gate logic unit is connected with the signal input end of the first AND gate logic unit, the signal output ends of the first AND gate logic unit and the second AND gate logic unit are connected with the signal input end of the exclusive OR gate logic unit, and the signal output end of the exclusive OR gate logic unit is connected with the normal indicator of the position information of the switch and the knife switch equipment;
the equipment running state input control module comprises an equipment running state input control switch, a third AND gate logic unit, a fourth AND gate logic unit, a first NOR gate logic unit and a second NOR gate logic unit; the equipment operation state input control switch is provided with a normal contact, a strong positioning contact and a strong positioning contact; the signal output end of the normal joint is respectively connected with the signal input ends of the third AND gate logic unit and the fourth AND gate logic unit, the signal output end of the first AND gate logic unit is connected with the signal input end of the fourth AND gate logic unit, and the signal output end of the second AND gate logic unit is connected with the signal input end of the third AND gate logic unit; the signal output end of the forced positioning joint is connected with the signal input end of the first NOR gate logic unit, the signal input end of the first NOR gate logic unit is also connected with the signal output end of the third AND gate logic unit, and the signal output end of the first NOR gate logic unit is connected with the signal input end of the direct current control protection device; the signal output end of the forced joint is connected with the signal input end of the second NOR gate logic unit, the signal input end of the second NOR gate logic unit is also connected with the signal output end of the fourth AND gate logic unit, the signal input end of the fourth AND gate logic unit is also connected with the signal output end of the first AND gate logic unit, and the signal output end of the second NOR gate logic unit is connected with the signal input end of the direct current control protection device; the signal input end of the direct current control protection device is connected with the signal output end of the fourth AND gate logic unit.
And the signal output end of the third AND gate logic unit is also connected with a closing indicator of the switch and knife switch equipment.
And the signal output end of the fourth AND gate logic unit is also connected with a switch and disconnecting link device disconnecting link indicator.
And the switch and disconnecting link equipment position information normal indicator, the switch and disconnecting link equipment closing indicator and the switch and disconnecting link equipment closing indicator are all sound and light lamps.
Compared with the prior art, the invention has the beneficial effects that:
the direct current control protection device for realizing the on-line maintenance of the switching value loop provided by the embodiment can judge whether the opening position and the closing position of the switch and the disconnecting link device are in a normal running state or not through the device running primary detection module, meanwhile, the device running state input control module is added on the basis of the device running primary detection module, when the loop is not maintained, the direct current control protection device adopts the opening and closing position information of the direct current switch type device, when the state information of the related device is input into the loop abnormally or the related device is required to be maintained, the correct position information of the device is further sent into the direct current control protection device through the position switching operation of the corresponding control unit module, and meanwhile, the fault loop is isolated from the running direct current control protection device, so that the on-line maintenance of the switching value loop of the device is realized. That is, the device does not need to exit the direct current control protection device related to the fault loop and does not need to carry out software setting work. The correct running state information of the on-site switch equipment can be provided for the direct-current control protection device through the switching operation of the single control module, the problem that the reliability of the direct-current control protection device is reduced due to the abnormality of the switching value input loop of the primary equipment is solved, the hidden danger of misoperation and refusal of the direct-current control protection device due to the abnormality of the maintenance of the switching value input loop is avoided, the running reliability of the direct-current control protection device is improved, and the risk of blocking a direct-current transmission system due to the abnormality of the direct-current control protection device is reduced.
Drawings
Fig. 1 is a logic diagram of a circuit processing of a direct current control protection device capable of realizing on-line maintenance of a switching value circuit, which is provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of the overall construction of a DC control protection device capable of realizing on-line maintenance of a switching value loop;
in the figure: 100. the device runs a primary detection module; 200. the equipment running state input control module; 300. a switch and disconnecting link device disconnecting link position contact; 400. a contact point at the closing position of the switch and the disconnecting link equipment; 500. a DC control protection device; 10. a first NOT logic unit; 11. a first AND gate logic unit; 12. a second NOT logic unit; 13. a second AND gate logic unit; 14. an exclusive-OR gate logic unit; 15. a normal indicator of the position information of the switch and the disconnecting link equipment; 20. an equipment running state input control switch; 21. a third AND gate logic unit; 22. a fourth AND gate logic unit; 23. a first nor gate logic unit; 24. a second nor gate logic unit; 25. a switch-on indicator of a switch and a disconnecting link device; 26. switch and knife switch equipment break switch indicator.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
Examples:
referring to fig. 1, a logic diagram of a circuit processing of a dc control protection device capable of implementing on-line maintenance of a switching value circuit according to this embodiment is shown, where the device includes a switch, a switch device opening position contact 300, a switch device closing position contact 400, a device operation primary detection module 100, a device operation state input control module 200, and a dc control protection device 500. Since the dc control protection arrangement 500 is a prior art, the specific construction and operation principle thereof will not be described in detail in the present embodiment.
The device operation primary detection module 100 includes a first not gate logic unit 10, a first and gate logic unit 11, a second not gate logic unit 12, a second and gate logic unit 13, an exclusive or gate logic unit 14, and a switch and knife switch device position information normal indicator 15. The signal output ends of the switch and knife switch equipment switch-off position contacts 300 are respectively connected with the signal input ends of the first AND gate logic unit 11 and the second NOT gate logic unit 12; the signal output ends of the switch and knife switch equipment closing position contacts 400 are respectively connected with the signal input ends of the first NOT logic unit 10 and the second AND logic unit 13; the signal output end of the second NOT logic unit 12 is connected with the signal input end of the second AND logic unit 13, the signal output end of the first NOT logic unit 10 is connected with the signal input end of the first AND logic unit 11, the signal output ends of the first AND logic unit 11 and the second AND logic unit 13 are connected with the signal input end of the exclusive OR logic unit 14, and the signal output end of the exclusive OR logic unit 14 is connected with the switch and knife switch equipment position information normal indicator 15. Therefore, under the normal operation condition, namely, no fault and no overhaul and maintenance work are performed on the operation state information input loops of all the switch equipment, the switch and knife switch equipment opening position contact 300 and the switch and knife switch equipment closing position contact 400 can only be closed by one of two, and at the moment, the switch and knife switch equipment position information normal indicator 15 can work normally to remind maintenance personnel of normal operation of equipment.
And the device operation state input control module 200 includes a device operation state input control switch 20, a third and gate logic unit 21, a fourth and gate logic unit 22, a first nor gate logic unit 23, and a second nor gate logic unit 24; wherein, the equipment operation state input control switch 20 is provided with a normal contact, a strong positioning contact and a strong positioning contact; the signal output end of the normal joint is respectively connected with the signal input ends of the third AND gate logic unit 21 and the fourth AND gate logic unit 22, the signal output end of the first AND gate logic unit 11 is connected with the signal input end of the fourth AND gate logic unit 22, and the signal output end of the second AND gate logic unit 13 is connected with the signal input end of the third AND gate logic unit 21; the signal output end of the forced bit-dividing joint is connected with the signal input end of the first NOR gate logic unit 23, the signal input end of the first NOR gate logic unit 23 is also connected with the signal output end of the third AND gate logic unit 21, and the signal output end of the first NOR gate logic unit 23 is connected with the signal input end of the direct current control protection device 500; the signal output end of the forced joint is connected with the signal input end of the second NOR gate logic unit 24, the signal input end of the second NOR gate logic unit 24 is also connected with the signal output end of the fourth AND gate logic unit 22, the signal input end of the fourth AND gate logic unit 22 is also connected with the signal output end of the first AND gate logic unit 11, and the signal output end of the second NOR gate logic unit 24 is connected with the signal input end of the direct current control protection device 500; the signal input terminal of the dc control protection arrangement 500 is further connected to the signal output terminals of the third and gate logic unit 21 and the fourth and gate logic unit 22.
That is, by adding the device operation state input control module 200 on the basis of the device operation primary detection module 100, and in specific engineering practical application, the device operation state input control modules 200 are all independent and are in one-to-one correspondence with the switch devices logically operated by the dc control protection device, as shown in fig. 2, the on-line maintenance of the switching value loop is further realized by the switching operation of the position state information of the single device operation state input control switch 20 of the corresponding switch device, so as to solve the problem that the reliability of the dc control protection device is reduced due to the abnormality of the primary device switching value input loop, and avoid the hidden trouble of malfunction and refusal of the dc control protection device due to the abnormality of the switching value input loop, which specifically comprises the following steps:
in normal operation, the device running state input control switch 20 is in a normal position, at this time, the device running state input control switch 20 does not output the forced close position and forced separate position information, the input signals of the first nor gate logic unit 23 and the second nor gate logic unit 24 are both in low level, the first nor gate logic unit 23 and the second nor gate logic unit 24 also output low level, the normal operation of the direct current control protection device 500 is not affected, and the direct current control protection device obtains the running state of the primary device through the third and gate logic unit 21 and the fourth and gate logic unit 22 of the device. If the primary device is at the opening position, that is, the contact 300 is in the closed state at the opening position of the switch and knife switch device, the information about the opening state of the switch and knife switch device is input to the dc control protection device 500 through the third and gate logic unit 21. Similarly, if the primary device is at the closing position at this time, that is, the contact 400 at the closing position of the switch and knife switch device is in the closed state, the information about the closing state of the switch and knife switch device is input to the dc control protection device 500 through the fourth and gate logic unit 22.
When the primary equipment position input loop fails or overhauls, the operation and maintenance personnel strongly sets the equipment operation state input control switch 20 at a position consistent with the actual operation state of the field primary equipment, namely if the equipment is in a closing state, the equipment operation state input control switch 20 is adjusted to a strongly set closing position so as to output a strongly set closing position signal, and the second NOR gate logic unit 24 inputs a high level so as to output the closing position signal, namely the high level, to the direct current protection device, so that the primary equipment is in the closing position; similarly, if the device is in the off state, the device operation state input control switch 20 is adjusted to the forced off position, and the first nor gate logic unit 21 inputs the high level, so that the off position signal, i.e., the high level, is output to the dc protection device 500, so that the primary device is in the off position.
As can be seen from the above analysis, the dc control protection device for implementing on-line maintenance of the switching value loop provided in this embodiment can determine whether the switching position and the closing position of the switch, the knife switch device are in a normal running state through the device running primary detection module 100, and meanwhile, by adding the device running state input control module 200 on the basis of the device running primary detection module 100, when the primary device position input loop is not being maintained, the dc control protection device 500 adopts the on-off position information of the dc switch device, and when the relevant device state information input loop is abnormal or needs maintenance, the correct position information of the device is sent into the dc control protection device through the position switching operation of the corresponding device running state input control switch 20, and meanwhile, the fault loop is isolated from the running dc control protection device, thereby implementing on-line maintenance of the device switching value loop, that is, the device does not need to exit the dc control protection device related to the fault loop, and does not need software setting. The direct current control protection device 500 can be provided with correct operation state information of on-site switch equipment through switching operation of the single equipment operation state input control switch 20, the problem that the reliability of the direct current control protection device is reduced due to abnormality of a switching value input loop of primary equipment is solved, hidden danger of misoperation and refusal of the direct current control protection device due to abnormality of maintenance of the switching value input loop is avoided, the operation reliability of the direct current control protection device is improved, and the risk of blocking of a direct current transmission system due to abnormal loss of the direct current control protection device is reduced.
Meanwhile, as shown in fig. 2, since the device running state input control modules 200 are independent and correspond to the switch devices logically operated by the dc control protection device one by one, the operation can be performed in engineering practice and there is no association between them. The single equipment running state control module consists of 3 states, namely normal, strong setting and positioning and strong setting and positioning, and the equipment running state information can be sent into the direct current control protection device through the switching operation of the single equipment running state input control module 200 so as to ensure the safe and stable running of the direct current control protection system.
As a preferable mode of this embodiment, the signal output end of the third and gate logic unit 21 is further connected to a switch, knife switch device closing indicator 25. The signal output of the fourth and gate logic unit 22 is also connected to a switch and knife device break indicator 26. Thus, when a certain switch or a disconnecting link switching-on/off loop is abnormal or needs to be overhauled, the device operation state input control switch 20 of the corresponding device operation state input control module 200 needs to be switched from a normal state to a position consistent with the actual operation state of the field device, as shown in fig. 2, if the switch is in a switching-off position in the actual operation, the operation state of the device operation state input control switch 20 is switched from the normal state to a strong switching-off position at this time, and the switch and disconnecting link device switching-off indicator 25 can send out strong switching-off position alarm information to remind overhauling maintenance personnel to prohibit changing the operation mode of the direct current transmission system; if the switch is in a closing position in actual operation, the operation state control module of the equipment operation state input control switch 20 is switched from a normal state to a forced closing position, and the switch and knife switch equipment closing indicators can send out forced closing position alarm information to remind an overhaul maintainer to prohibit changing the operation mode of the direct current transmission system. After the operation, on one hand, the fault loop is isolated from the running direct current control protection device, and the on-line direct current control protection device is not affected by the overhaul and maintenance work of the fault loop; on the other hand, the correct running state information of the equipment is sent into the direct current control protection device, and the problem of single running of the direct current control protection system caused by the failure of the switching value input loop is solved.
Specifically, the normal indicator 15 of the position information of the switch and the knife switch device, the closing indicator 25 of the switch and the knife switch device, and the closing indicator 26 of the switch and the knife switch device are all sound and light lamps, so as to prompt maintenance personnel in time.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The direct current control protection device for realizing on-line maintenance of the switching value loop is characterized by comprising a switch, a disconnecting link device switching-off position contact, a switch, a disconnecting link device switching-on position contact, a device operation primary detection module, a device operation state input control module and a direct current control protection device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the device operation primary detection module comprises a first NOT gate logic unit, a first AND gate logic unit, a second NOT gate logic unit, a second AND gate logic unit, an exclusive OR gate logic unit and a switch and disconnecting link device position information normal indicator; the signal output ends of the switch and disconnecting link equipment disconnecting link position contacts are respectively connected with the signal input ends of the first AND gate logic unit and the second NOT gate logic unit; the signal output ends of the switching-on position contacts of the switch and the disconnecting link equipment are respectively connected with the signal input ends of the first NOT gate logic unit and the second AND gate logic unit; the signal output end of the second NOT gate logic unit is connected with the signal input end of the second AND gate logic unit, the signal output end of the first NOT gate logic unit is connected with the signal input end of the first AND gate logic unit, the signal output ends of the first AND gate logic unit and the second AND gate logic unit are connected with the signal input end of the exclusive OR gate logic unit, and the signal output end of the exclusive OR gate logic unit is connected with the normal indicator of the position information of the switch and the knife switch equipment;
the equipment running state input control module comprises an equipment running state input control switch, a third AND gate logic unit, a fourth AND gate logic unit, a first NOR gate logic unit and a second NOR gate logic unit; the equipment operation state input control switch is provided with a normal contact, a strong positioning contact and a strong positioning contact; the signal output end of the normal joint is respectively connected with the signal input ends of the third AND gate logic unit and the fourth AND gate logic unit, the signal output end of the first AND gate logic unit is connected with the signal input end of the fourth AND gate logic unit, and the signal output end of the second AND gate logic unit is connected with the signal input end of the third AND gate logic unit; the signal output end of the forced positioning joint is connected with the signal input end of the first NOR gate logic unit, the signal input end of the first NOR gate logic unit is also connected with the signal output end of the third AND gate logic unit, and the signal output end of the first NOR gate logic unit is connected with the signal input end of the direct current control protection device; the signal output end of the forced joint is connected with the signal input end of the second NOR gate logic unit, the signal input end of the second NOR gate logic unit is also connected with the signal output end of the fourth AND gate logic unit, the signal input end of the fourth AND gate logic unit is also connected with the signal output end of the first AND gate logic unit, and the signal output end of the second NOR gate logic unit is connected with the signal input end of the direct current control protection device; the signal input end of the direct current control protection device is connected with the signal output end of the fourth AND gate logic unit.
2. The direct current control protection device for realizing on-line maintenance of switching value loop according to claim 1, wherein the signal output end of the third AND gate logic unit is also connected with a closing indicator of a switch and a knife switch device.
3. The direct current control protection device for realizing on-line maintenance of switching value loop according to claim 1 or 2, wherein the signal output end of the fourth AND gate logic unit is also connected with a switch and disconnecting link device opening indicator.
4. The direct current control protection device for realizing on-line maintenance of switching value loops according to claim 3, wherein the switch and knife switch equipment position information normal indicator, the switch and knife switch equipment closing indicator and the switch and knife switch equipment closing indicator are all acousto-optic lamps.
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| CN201711281830.6A CN107918430B (en) | 2017-12-07 | 2017-12-07 | Direct-current control protection device for realizing on-line maintenance of switching value loop |
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