CN110349782B - An electrical five-protection locking circuit - Google Patents
An electrical five-protection locking circuit Download PDFInfo
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- CN110349782B CN110349782B CN201910722118.8A CN201910722118A CN110349782B CN 110349782 B CN110349782 B CN 110349782B CN 201910722118 A CN201910722118 A CN 201910722118A CN 110349782 B CN110349782 B CN 110349782B
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- 238000010079 rubber tapping Methods 0.000 description 37
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000003211 malignant effect Effects 0.000 description 3
- 230000007123 defense Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 101100232769 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) IGD1 gene Proteins 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
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- Keying Circuit Devices (AREA)
Abstract
本发明提供了一种电气五防闭锁回路，包括接地刀闭锁回路、母线侧的第一隔离开关闭锁回路、第二隔离开关闭锁回路、线路侧的第三隔离开关闭锁回路和临时接地刀闭锁回路；在第一隔离开关闭锁回路和第二隔离开关闭锁回路中，第一隔离开关分位接点通过临时接地刀闭锁回路与共同节点连接，第二隔离开关分位接点通过临时接地刀闭锁回路与共同节点连接。其中，共同节点为第一隔离开关分位接点与第二隔离开关分位接点连接至同一处的节点。当临时接地刀接地后，由于临时接地刀闭锁回路根据母线电压连通或断开，能够自适应解决由于临时地线缺乏有效的闭锁，在调试当前母线的隔离开关时，误合另一带电母线的隔离开关所导致的人员伤亡、设备损毁的技术问题。
The present invention provides an electrical five-protection locking circuit, including a grounding knife locking circuit, a first isolating switch locking circuit on the bus side, a second isolating switch locking circuit, a third isolating switch locking circuit on the line side, and a temporary grounding knife locking circuit; in the first isolating switch locking circuit and the second isolating switch locking circuit, the first isolating switch split contact is connected to a common node through a temporary grounding knife locking circuit, and the second isolating switch split contact is connected to a common node through a temporary grounding knife locking circuit. The common node is the node where the first isolating switch split contact and the second isolating switch split contact are connected to the same place. When the temporary grounding knife is grounded, since the temporary grounding knife locking circuit is connected or disconnected according to the bus voltage, it can adaptively solve the technical problem of casualties and equipment damage caused by mistakenly closing the isolating switch of another energized bus when debugging the isolating switch of the current bus due to the lack of effective locking of the temporary ground wire.
Description
Technical Field
The invention relates to the technical field of electric equipment overhaul, in particular to an electric five-prevention locking loop.
Background
The requirement of five-prevention of electrical equipment is put forward by the safety of a power grid, wherein the electrical equipment with the voltage level of 110kV and above is definitely regulated, and the design principle of electrical error-prevention interlocking is adopted preferentially. Therefore, providing an electric lock in the operation secondary circuit has become an effective and feasible means for preventing accidents such as human misoperation. The switching operation should be strictly carried out according to the specified power cut and transmission sequence, and the ground wire is strictly forbidden to be closed.
As shown in fig. 1, a certain line interval bus side is provided with isolating switches 1G and 2G, wherein one end of the 1G isolating switch is connected with a first section bus 1M, the other end of the 1G isolating switch is connected with a 2G isolating switch and then connected to a circuit breaker DL, one end of the 2G isolating switch is connected with a second section bus 2M, the other end of the 2G isolating switch is connected with the 1G isolating switch, the 2G isolating switch is connected with a 02G grounding knife and is of an integrated structure, meanwhile, the 2G isolating switch and the 02G grounding knife have a mechanical interlocking relationship, namely when the 2G isolating switch is in an on-position, the mechanical interlocking circuit control of the 02G grounding knife cannot be operated, and on the other hand, when the 02G grounding knife is in an on-position, the mechanical interlocking circuit control of the 2G isolating switch cannot be operated.
When the bus side interval 2G isolating switch in fig. 1 needs to be overhauled, the bus interval is firstly disconnected, namely the bus breaker ML is disconnected, the 1G isolating switch and the 2G isolating switch are disconnected, then the second-section bus 2M is powered off, the overhauling interval is withdrawn to operate, namely the breaker DL is disconnected, the 1G isolating switch, the 2G isolating switch and the 4G isolating switch are all placed at the disconnected positions, then the 02G grounding knife and the grounding knife IIGD1 on the second-section bus 2M are all closed, and the two sides of the overhauling isolating switch 2G are grounded, so that the safety of overhauling personnel is ensured.
When the bus side interval 1G isolating switch in fig. 1 needs to be overhauled, the bus side interval is firstly disconnected, namely the bus breaker ML is disconnected, the 1G isolating switch and the 2G isolating switch are disconnected, then the first-section bus 1M is powered off, the overhauling interval is withdrawn to operate, namely the breaker DL is disconnected, the 1G isolating switch, the 2G isolating switch and the 4G isolating switch are all placed at the disconnected positions, then the 02G grounding knife and the grounding knife IGD1 on the first-section bus 1M are all closed, the two sides of the overhauling isolating switch 1G are grounded, and the safety of overhauling personnel is ensured.
However, since the disconnecting switch 1G and the disconnecting switch 2G need to be checked for the closed and open state during debugging, and the 02G grounding knife needs to be separated when the switch needs to be closed, the grounding point between the 1G disconnecting switch and the 2G disconnecting switch is lost, and the personnel safety cannot be protected, so that a temporary grounding wire needs to be hung, as shown by L02G and L02G in fig. 2, the temporary grounding knife needs to be closed (in the closing position).
However, in the current temporary grounding knife position, no electric five-prevention locking loop is connected to the site (as shown in fig. 3), in the 1G control loop in fig. 3, when the line side disconnecting switch 2G needs to be overhauled and debugged, the 02G grounding knife is separated (in a separated position), as the DL contact, the 02G contact, the 04G1 contact and the 2G contact are all in a separated position, the 1G control loop can be unlocked for use, misoperation can occur to cause the 1G disconnecting switch to be closed, and because the bus 1M is electrified, a serious safety problem exists when workers debug the disconnecting switch 2G, the disconnecting switch often needs to be unlocked to debug the disconnecting switch, and the disconnecting switch locking loop does not have a method to achieve the self-adaption overhauling requirement, so that the device is only suitable for traditional switching operation.
Therefore, because the temporary ground wire lacks effective locking, when the isolating switch of the current bus is debugged, casualties and equipment damage caused by mistakenly closing the isolating switch of another live bus are technical problems to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides an electric five-prevention locking loop, which is used for solving the technical problems of casualties and equipment damage caused by mistakenly closing a disconnecting switch of another electrified bus when debugging the disconnecting switch of the current bus due to the lack of effective locking of a temporary ground wire, and can realize the self-adaptive maintenance of the locking loop without any unlocking key.
In view of the above, the present invention provides an electric five-prevention locking circuit, including a grounding knife locking circuit, a first isolating switch locking circuit on a bus side, a second isolating switch locking circuit, a third isolating switch locking circuit on a line side, and a temporary grounding knife locking circuit;
In the first disconnecting switch locking loop and the second disconnecting switch locking loop, a first disconnecting switch split joint is connected with a common node through the temporary grounding knife locking loop, and a second disconnecting switch split joint is connected with the common node through the temporary grounding knife locking loop;
The common node is a node at which the first disconnecting switch tapping point and the second disconnecting switch tapping point are connected to the same place;
when the temporary grounding knife is grounded, the temporary grounding knife locking loop is connected or disconnected according to the busbar voltage.
Preferably, the temporary grounding knife locking loop between the second disconnecting switch split joint and the common node comprises a temporary grounding knife first combining joint and a first voltage joint;
The common node, the first combining contact of the temporary grounding knife, the first voltage contact and the dividing contact of the second isolating switch are sequentially connected;
The first combining point of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife. The first voltage contact is connected or disconnected according to the voltage of a first bus corresponding to the first isolating switch.
Preferably, the temporary grounding knife locking loop between the first disconnecting switch tapping point and the common node comprises a temporary grounding knife first merging point and a first voltage point;
The common node, the second combining contact of the temporary grounding knife, the second voltage contact and the dividing contact of the first isolating switch are sequentially connected;
The second combining point of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife. The second voltage contact is connected or disconnected according to the voltage of a second bus corresponding to the second isolating switch.
Preferably, the temporary grounding knife locking loop between the second disconnecting switch tap point and the common node further comprises a temporary grounding knife first tap point;
The first combining point of the temporary grounding knife and the branch circuit formed by the first voltage contact are connected in parallel with the first dividing point of the temporary grounding knife.
Preferably, the temporary grounding knife locking loop between the first disconnecting switch tapping point and the common node further comprises a temporary grounding knife second tapping point;
And the branch circuit formed by the second combining point of the temporary grounding knife and the second voltage point is connected with the second combining point of the temporary grounding knife in parallel.
Preferably, each contact in the electrical five-prevention locking circuit is from a relay contact.
Preferably, the first voltage contact and the second voltage contact are both from three-phase no-voltage relay contacts.
Preferably, the three-phase no-voltage relay detects voltages of a630, B630, C630 and N600 on the bus.
Preferably, when the voltages among the a630, the B630, the C630 and the N600 are all smaller than the settable low-voltage fixed value 1, the three-phase no-voltage relay detection bus is no voltage.
From the above technical solutions, the embodiment of the present invention has the following advantages:
The invention provides an electric five-prevention locking loop which comprises a grounding knife locking loop, a first isolating switch locking loop, a second isolating switch locking loop, a third isolating switch locking loop and a temporary grounding knife locking loop, wherein the first isolating switch locking loop and the second isolating switch locking loop are connected with a common node through the temporary grounding knife locking loop, and the second isolating switch split joint is connected with the common node through the temporary grounding knife locking loop. The common node is a node where the first disconnecting switch tapping point and the second disconnecting switch tapping point are connected to the same place. After the temporary grounding knife is grounded, the temporary grounding knife locking loop is connected or disconnected according to the bus voltage, so that the technical problems of casualties and equipment damage caused by mistakenly closing the isolating switch of the other live bus when the isolating switch of the current bus is debugged due to the fact that the temporary ground wire is lack of effective locking can be solved, and the requirement of self-adaptive overhaul of the locking loop for hanging the temporary ground wire can be met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of an actual primary wiring in the field;
FIG. 2 is a schematic diagram of the actual primary wiring after the temporary field ground wire is connected;
FIG. 3 is a schematic diagram of a conventional electrical five-prevention latch-up circuit;
FIG. 4 is a schematic diagram of an embodiment of an electrical five-prevention latch-up circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a temporary ground blade latching circuit between the second isolator tap point and the common node;
FIG. 6 is a schematic diagram of a temporary ground blade latching circuit between the first disconnector tap point and the common node;
fig. 7 is a schematic structural diagram of the first voltage contact.
Detailed Description
The embodiment of the invention provides an electric five-prevention locking loop, which is used for solving the technical problems of casualties and equipment damage caused by mistakenly closing a disconnecting switch of another electrified bus when debugging the disconnecting switch of the current bus due to the lack of effective locking of a temporary ground wire, discarding the original method of unlocking and debugging, and realizing the self-adaption of the locking loop.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 4, an embodiment of an electrical five-prevention locking circuit provided by the invention comprises a temporary grounding knife locking circuit b, a temporary grounding knife locking circuit c, a grounding knife locking circuit, a first isolating switch locking circuit on a bus side, a second isolating switch locking circuit and a third isolating switch locking circuit on a line side.
Note that, each contact in fig. 4 corresponds to each disconnecting switch and each grounding knife in fig. 2. The first isolating switch locking circuit in the embodiment of the invention comprises a DL (digital hierarchy) split joint, a 02G split joint, a 04G1 split joint, a temporary grounding knife locking circuit b, a 2G split joint, a 2G combined joint and a 1G control circuit. The second disconnecting switch locking loop comprises a DL (digital hierarchy) tapping point, a 02G tapping point, a 04G1 tapping point, a temporary grounding knife locking loop c, a 1G tapping point, a 1G merging point and a 2G control loop. The third isolation switch locking loop comprises a DL (digital hierarchy) tapping point, a 02G tapping point, a 04G1 tapping point, a 04G2 tapping point and a 4G control loop. The grounding knife locking circuit comprises three circuits, namely (1) a DL (DL) tapping point, a 1G tapping point, a 2G tapping point, a 4G tapping point and a 02G control circuit, (2) a circuit formed by the DL tapping point, the 1G tapping point, the 2G tapping point, the 4G tapping point and a 04G1 control circuit, and (3) a circuit formed by a DK7 merging point, a YJS tapping point, the 4G tapping point and a 04G2 control circuit.
In the first disconnecting switch locking loop and the second disconnecting switch locking loop, the first disconnecting switch tapping point (namely, the 1G tapping point) is connected with the common node a through the temporary grounding knife locking loop c, and the second disconnecting switch tapping point (namely, the 2G tapping point) is connected with the common node a through the temporary grounding knife locking loop b.
The common node a is a node where the first disconnecting switch tapping point and the second disconnecting switch tapping point are connected to the same place.
After the temporary grounding knife is grounded, the temporary grounding knife locking loop b or c is connected or disconnected according to the bus voltage, so that the technical problems of casualties and equipment damage caused by the fact that the temporary ground wire is lack of effective locking and the disconnecting switch of the other live bus is mistakenly closed when the disconnecting switch of the current bus is debugged can be solved.
Further, as shown in FIG. 5, the temporary ground blade latch circuit b between the second disconnector tap point and the common node a includes a temporary ground blade first tap point k1, a first voltage point k2, and a temporary ground blade first tap point k3.
The common node a, the first combining contact k1 of the temporary grounding knife, the first voltage contact k2 and the dividing contact of the second isolating switch are sequentially connected.
The branch circuit of the first combining point k1 of the temporary grounding knife and the first voltage point forming k2 is connected with the first dividing point k3 of the temporary grounding knife in parallel.
The first contact k1 of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife, that is, when the temporary grounding knife L02G in fig. 2 is grounded, the first contact k1 of the temporary grounding knife is connected and not grounded. The first voltage contact k2 is connected or disconnected according to the voltage of the first bus corresponding to the first isolating switch, namely, when the voltage of the bus 1M in fig. 2 is lower than the set low-voltage fixed value 1, the first voltage contact k2 is connected, and when the voltage is higher than the set low-voltage fixed value 2, the first voltage contact k2 is disconnected. The condition for determining whether the first contact k3 of the temporary ground blade is on or off is opposite to the condition for determining whether the first contact k1 of the temporary ground blade is on or off.
Further, as shown in FIG. 6, the temporary ground blade latching circuit c between the first disconnector tap point and the common node a includes a temporary ground blade second tap point k4, a first voltage point k5 and a second temporary ground blade tap point k6.
The common node a, the second combining contact k4 of the temporary grounding knife, the second voltage contact k5 and the first disconnecting switch dividing contact k6 are sequentially connected.
The branch circuit formed by the second combining point k4 and the second voltage point k5 of the temporary grounding knife is connected with the second combining point k6 of the temporary grounding knife in parallel.
The second contact k4 of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife, that is, when the temporary grounding knife L02G in fig. 2 is grounded, the second contact k4 of the temporary grounding knife is connected and is disconnected when it is not grounded. The second voltage contact k5 is connected or disconnected according to the voltage of the second bus corresponding to the second isolating switch, that is, when the voltage of the bus 2M in fig. 2 is lower than the set low-voltage fixed value 1, the second voltage contact k5 is connected and when the voltage is higher than the set low-voltage fixed value 2, the second voltage contact k5 is disconnected. The condition for determining whether the temporary ground blade second tapping point k6 is on or off is opposite to the condition for determining whether the temporary ground blade second tapping point k4 is on or off.
Further, each contact in the electric five-prevention locking circuit provided by the embodiment of the invention is from an auxiliary contact or a relay contact. And the first voltage contact k2 and the second voltage contact k5 are both from three-phase no-voltage relay contacts. As shown in fig. 7 (taking the first voltage contact k2 as an example), none of the three-phase voltage relays detect voltages between a630, B630, C630 and N600 on the bus. When the voltages among A630, B630, C630 and N600 are smaller than the settable low-voltage fixed value 1, the three-phase none-voltage relay detection bus is no voltage.
In this embodiment, the contact point refers to the switch or the grounding knife corresponding to the contact point, if the switch or the grounding knife is in the closed state in fig. 2, the contact point in fig. 4 is turned on, and the contact point refers to the switch or the grounding knife corresponding to the contact point, if the switch or the grounding knife is in the open state in fig. 2, the contact point in fig. 4 is turned on.
The working process of the electric five-prevention locking loop provided by the invention is described as follows:
In fig. 2, when the temporary ground wire L02G needs to be added for maintenance of the disconnecting switch 2G, in order to operate the disconnecting switch 1G, due to the temporary grounding knife locking loop b of the electric five-prevention locking loop provided by the invention, two contacts (i.e., the temporary grounding knife first combining contact k1 and the first voltage contact k 2) of the "L02G combining position" and the "bus 1M no-voltage" must be both connected, i.e., when the temporary grounding knife L02G is grounded, the "three-phase no-electricity of the first-section bus 1M voltage transformer" must be satisfied to allow the operation of the 1G disconnecting switch. When the temporary grounding knife L02G is not grounded, the tap point of the temporary grounding knife L02G (temporary grounding knife first tap point k 3) is turned on, shorting the above-described latch circuit, and restoring the normal latch wiring as in fig. 3. When the temporary ground wire L02G needs to be additionally installed in the maintenance of the isolating switch 2G, in order to operate the isolating switch 2G, two contacts (namely a second combining contact k4 and a second voltage contact k5 of the temporary grounding knife) of the L02G combining position and the 2M no-voltage must be both connected, namely when the temporary grounding knife L02G is grounded, the requirement that the three phases of the voltage mutual inductance of the second section bus 2M are all no-current must be met, and the isolating switch 2G is allowed to be operated. When the "temporary grounding knife L02G is not grounded", the tapping point of the temporary grounding knife L02G (temporary grounding knife second tapping point k 6) is turned on, shorting the above-described latch circuit, and restoring the normal latch wiring as in fig. 3.
Similarly, when the temporary ground wire L02G needs to be additionally installed in the overhauling of the isolating switch 1G, in order to operate the isolating switch 2G, because of the existence of the temporary grounding knife locking loop c of the electric five-prevention locking loop provided by the invention, two contacts (namely, the second combining contact k4 and the second voltage contact k5 of the temporary grounding knife) of the 'L02G combining position' and the '2M no-voltage' must be both connected, namely, when the temporary grounding knife L02G is grounded, the 'three-phase no-electricity of the voltage mutual inductance of the second section bus 2M' must be satisfied to allow the isolating switch 2G to be operated. When the "temporary grounding knife L02G is not grounded", the tapping point of the temporary grounding knife L02G (temporary grounding knife second tapping point k 6) is turned on, shorting the above-described latch circuit, and restoring the normal latch wiring as in fig. 3. When the temporary ground wire L02G is required to be additionally arranged in the overhauling process of the isolating switch 1G, two contacts (namely a first contact k1 and a first voltage contact k2 of the temporary grounding knife) of the 'L02G joint' and the 'bus 1M no-voltage' must be both switched on in order to operate the isolating switch 1G, namely the 'three-phase no-electricity' of the first-section bus 1M voltage transformer must be satisfied when the temporary grounding knife L02G is grounded, and the operation of the 1G isolating switch is allowed. When the temporary grounding knife L02G is not grounded, the tap point of the temporary grounding knife L02G (temporary grounding knife first tap point k 3) is turned on, shorting the above-described latch circuit, and restoring the normal latch wiring as in fig. 3.
Therefore, through the electric five-prevention locking loop provided by the invention, when the temporary grounding wire is at the access position, the corresponding isolation switch is allowed to be operated only when the corresponding bus three-phase voltage is not available, and when the new locking loop of the temporary grounding wire is not at the access position and is shorted, the original locking state is recovered, other operations are not influenced, and the locking loop is required to be additionally released, so that the new locking loop only works after the temporary grounding wire is put into use, the electric five-prevention locking loop has good pertinence, the accident of mistakenly closing the isolation switch with the temporary grounding wire can be effectively prevented, the mistaken unlocking can be avoided, and the electric five-prevention locking loop has self-adaptability.
The invention overturns the previous method of ensuring that the temporary ground wire does not generate malignant misoperation by a manual management method, and the method of generating wrong walking intervals frequently caused by people and causing malignant misoperation by manual unlocking, so that a new closed loop is changed from civil air defense to technical defense. As long as the temporary grounding wire (namely the temporary grounding knife in the invention) is hung, the disconnecting switch at the bus side with the electrified overhaul interval, namely the voltage relay is pressed, can not be operated, and the occurrence of malignant misoperation is stopped, but the normal switching operation is not affected by any influence, and the comprehensive anti-misoperation locking loop adopting the voltage quantity and the switching quantity has self-adaption and reliability.
While the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the foregoing embodiments may be modified or equivalents may be substituted for some of the features thereof, and that the modifications or substitutions do not depart from the spirit and scope of the embodiments of the invention.
Claims (5)
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| CN201910722118.8A CN110349782B (en) | 2019-08-06 | 2019-08-06 | An electrical five-protection locking circuit |
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| US7529069B1 (en) * | 2002-08-08 | 2009-05-05 | Weems Ii Warren A | Apparatus and method for ground fault detection and location in electrical systems |
| JP4878912B2 (en) * | 2006-05-24 | 2012-02-15 | 中国電力株式会社 | Equipment protection system in case of bus ground fault |
| CN103236362B (en) * | 2013-04-16 | 2016-06-08 | 广东电网公司东莞供电局 | A kind of disconnecting link control method based on PLC and system |
| CN207038382U (en) * | 2017-06-15 | 2018-02-23 | 国网浙江省电力公司湖州供电公司 | An Improved Structure of Electrical Blocking Circuit of Disconnector |
| CN107508148B (en) * | 2017-08-17 | 2024-08-23 | 广东电网有限责任公司佛山供电局 | Locking structure of transformer substation grounding wire |
| CN208738081U (en) * | 2018-08-01 | 2019-04-12 | 中国南方电网有限责任公司超高压输电公司柳州局 | A kind of ground line locking disconnecting link error-proof device |
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| CN210223831U (en) * | 2019-08-06 | 2020-03-31 | 广东电网有限责任公司 | Electric five-prevention locking loop |
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