CN118017676A - PT disconnecting link of bus voltage transformer and secondary side switch control loop - Google Patents
PT disconnecting link of bus voltage transformer and secondary side switch control loop Download PDFInfo
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- CN118017676A CN118017676A CN202311818038.5A CN202311818038A CN118017676A CN 118017676 A CN118017676 A CN 118017676A CN 202311818038 A CN202311818038 A CN 202311818038A CN 118017676 A CN118017676 A CN 118017676A
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- 238000012790 confirmation Methods 0.000 claims abstract description 95
- 238000005259 measurement Methods 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008707 rearrangement 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
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The control loop comprises a positive pole end, a plurality of working condition confirmation channels, a plurality of bus voltage transformer PT disconnecting link control channels, a plurality of secondary side switch control channels and a negative pole end; according to the technical scheme, the control loops of the PT disconnecting link of the bus voltage transformer and the secondary side switch are arranged, and when the opening and closing conditions are met, the control loops of the PT disconnecting link of the bus voltage transformer and the secondary side switch are conducted, and then the opening and closing of the PT disconnecting link of the bus voltage transformer and the secondary side switch can be automatically controlled, so that the situation that the PT disconnecting link of the bus voltage transformer and the secondary side switch are opened or closed when the opening and closing conditions are not met due to negligence when an operator manually opens and closes the opening and closing is avoided, hidden danger is left for the secondary side of the voltage transformer, the programming of opening and closing operation is realized, and the safety is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of substation automation, in particular to a PT disconnecting link of a bus voltage transformer and a secondary side switch control loop.
Background
The voltage transformer is used as one of important equipment in the power system, and has the function of converting the primary side alternating current high voltage of the power system into the secondary side low voltage which can be used by instruments and meters and a protection control device according to the rated proportion. Among them, for a voltage transformer connected to a bus through a knife switch, it is called a bus voltage transformer, and its secondary side is usually connected to a secondary device through an air switch or a fuse. In actual operation, when the bus voltage transformer fails or the bus is required to be overhauled in a power failure, the bus voltage transformer is required to be shut down, namely, a secondary side air switch (or a fuse) of the bus voltage transformer is firstly disconnected (or taken down), then a primary side PT disconnecting link of the secondary side air switch is pulled open, and the power transmission sequence is opposite.
With the continuous improvement of the automatic technology and the electrical equipment performance of the transformer substation, the transformer substation is gradually changed from a conventional transformer substation to an intelligent transformer substation, and meanwhile, with the continuous acceleration of the construction steps of an unattended transformer substation, the electrical switching operation of the transformer substation is gradually changed from a conventional one-key multi-step programming operation to a background one-step remote control operation. However, since the secondary side of the conventional bus voltage transformer is connected by an air switch or a fuse, the background remote control operation cannot be realized, and the programming operation cannot be realized. The invention adopts a wire control air switch to replace a manual air switch or a fuse adopted by the secondary side of the traditional bus voltage transformer, and designs a corresponding control loop to realize the programmed operation of the disconnecting link and the air switch.
Disclosure of Invention
The invention provides a control loop of a bus voltage transformer PT disconnecting link and a secondary side switch.
In a first aspect, an embodiment of the present invention provides a busbar voltage transformer disconnecting link and a secondary side switch control loop, which are applied to a busbar voltage transformer disconnecting link and a secondary side switch control system, wherein the busbar voltage transformer is connected with a busbar, and the busbar voltage transformer disconnecting link is connected between the busbar voltage transformer and the busbar; the secondary side switch is connected between the busbar voltage transformer disconnecting link and secondary equipment; the control loop comprises a positive electrode end, a plurality of working condition confirmation channels, a plurality of busbar voltage transformer knife switch control channels, a plurality of secondary side switch control channels and a negative electrode end; the working condition confirmation passages, the bus voltage transformer knife switch control passages and the secondary side switch control passages are connected in parallel between the positive electrode end and the negative electrode end; the bus voltage transformer disconnecting link control path comprises a disconnecting link mechanism box, and the secondary side switch control path comprises a secondary side switch operating mechanism; the working condition confirmation passage is used for determining whether the control system is in a preset working condition and is conducted under the preset working condition; when the working condition confirmation passage is conducted, the bus voltage transformer disconnecting link control passage and the secondary side switch control passage under the corresponding working conditions are conducted, and the disconnecting link mechanism box and the secondary side switch operating mechanism are powered to control the bus voltage transformer disconnecting link and the secondary side switch to be disconnected or closed.
Optionally, the preset working condition includes a closing working condition; the working condition confirmation channels comprise closing working condition confirmation channels; the switching-on working condition confirmation passage comprises a switching-on intermediate relay and a switching-on delay intermediate relay; the normally open contact of the switching-on intermediate relay is positioned in the control path of the disconnecting link of the bus voltage transformer; the normally open contact of the switching-on delay intermediate relay is positioned in the secondary side switch control path;
When the switching-on working condition confirms that the passage is conducted, the switching-on intermediate relay and the switching-on delay intermediate relay are powered on, and a normally open contact of the switching-on intermediate relay and a normally open contact of the switching-on delay intermediate relay are sequentially closed; the control channel of the disconnecting link of the bus voltage transformer and the control channel of the secondary side switch are sequentially conducted, and the disconnecting link mechanism box and the secondary side switch operating mechanism are sequentially electrified so as to control the disconnecting link of the bus voltage transformer and the secondary side switch to be sequentially switched on.
Optionally, the knife switch mechanism box comprises a first switch-on signal input end; the secondary side switch operating mechanism comprises a second switching-on signal input end;
The normally open contact of the switching-on intermediate relay is connected with the first switching-on signal input end; the normally open contact of the switching-on delay intermediate relay is connected with the second switching-on signal input end;
under the switching-on working condition, the disconnecting link mechanism box obtains electricity from the first switching-on signal input end; the secondary side switch operating mechanism obtains electricity from the second switching-on signal input end.
Optionally, the preset working condition includes a brake-off working condition; the working condition confirmation passage comprises a brake-separating working condition confirmation passage;
The opening working condition confirmation path comprises an opening intermediate relay and an opening delay intermediate relay; the normally open contact of the switching-off intermediate relay is positioned in the secondary side switch control path; the normally open contact of the switching-off delay intermediate relay is positioned in the disconnecting link control path of the bus voltage transformer;
When the opening working condition confirms that the passage is conducted, the opening intermediate relay and the opening delay intermediate relay are powered on, and a normally open contact of the opening intermediate relay and a normally open contact of the opening delay intermediate relay are closed successively; the secondary side switch control channel and the bus voltage transformer disconnecting link control channel are sequentially conducted, and the secondary side switch operating mechanism and the disconnecting link mechanism box are sequentially electrified so as to control the secondary side switch and the bus voltage transformer disconnecting link to be sequentially disconnected.
Optionally, the disconnecting link mechanism box comprises a first disconnecting link signal input end; the secondary side switch operating mechanism comprises a second brake separating signal input end;
the normally open contact of the switching-off intermediate relay is connected with the second switching-off signal input end; the normally open contact of the switching-off delay intermediate relay is connected with the first switching-off signal input end;
Under the opening working condition, the disconnecting link mechanism box obtains electricity from the first opening signal input end; the secondary side switch operating mechanism obtains electricity from the second brake separating signal input end.
Optionally, the control system comprises a far-near working condition switching handle, a near control closing button and a five-prevention lock; the closing working conditions comprise a close control closing working condition; the closing working condition confirmation passage comprises a close control closing working condition confirmation passage;
The close-control closing working condition confirmation path comprises a closing intermediate relay, a closing delay intermediate relay, a normally closed contact of the far-near working condition switching handle, a normally open contact of a five-prevention lock and a normally open contact of a close-control closing button;
When the close-control closing working condition confirms that the passage is conducted, the normally closed contact of the far-near working condition switching handle, the normally open contact of the five-prevention lock and the normally open contact of the close-control closing button are closed; and the switching-on intermediate relay and the switching-on delay intermediate relay are powered on.
Optionally, the control system further comprises a close control brake separating button; the brake-separating working condition comprises a close control brake-separating working condition; the brake-off working condition confirmation passage comprises a close control brake-off working condition confirmation passage;
the close control opening working condition confirmation path comprises the opening intermediate relay, an opening delay intermediate relay, a normally closed contact of the far and near working condition switching handle, a normally open contact of a five-prevention lock and a normally open contact of the close control opening button;
When the close control opening working condition confirms that the passage is conducted, the normally closed contact of the far and near working condition switching handle, the normally open contact of the five-prevention lock and the normally open contact of the close control opening button are closed; and the switching-off intermediate relay and the switching-off delay intermediate relay are powered on.
Optionally, the control system further comprises a measurement and control device; the measurement and control device comprises a remote control closing relay; the switching-on working conditions comprise a remote control switching-on working condition; the closing working condition confirmation passage comprises a remote control closing working condition confirmation passage;
the remote control closing working condition confirmation path comprises a closing intermediate relay, a closing delay intermediate relay, a normally open contact of the far and near working condition switching handle and a normally open contact of the remote control closing relay;
when the remote control switching-on working condition confirms that the passage is conducted, the normally open contact of the remote control switching-on relay is closed; and the switching-on intermediate relay and the switching-on delay intermediate relay are powered on.
Optionally, the measurement and control device comprises a remote control brake-separating relay; the brake-separating working condition comprises a remote control brake-separating working condition; the opening working condition confirmation passage comprises a remote control opening working condition confirmation passage;
the remote control opening working condition confirmation path comprises the opening intermediate relay, an opening delay intermediate relay, a normally open contact of a far and near working condition switching handle and a normally open contact of a remote control opening relay;
When the remote control opening working condition confirms that the passage is conducted, the normally open contact of the remote control opening relay is closed; and the switching-off intermediate relay and the switching-off delay intermediate relay are powered on.
Optionally, a busbar grounding knife is connected between the busbar and the grounding end; a bus voltage transformer grounding knife is connected between the bus voltage transformer and the grounding end; the control system further comprises an air switch;
The working condition confirmation path comprises a normally open contact of the air switch; the working condition confirmation passage is conducted when the normally open contact of the air switch is closed; the control path of the PT disconnecting link of the bus voltage transformer further comprises a normally-closed contact of the PT grounding knife and a normally-closed contact of the bus grounding knife; and when the working condition confirmation passage is conducted and the normally-closed contact of the PT grounding knife and the normally-closed contact of the bus grounding knife are closed, the control passage of the PT knife switch of the bus voltage transformer is conducted.
The invention provides a PT disconnecting link of a bus voltage transformer and a secondary side switch control loop, which are applied to a PT disconnecting link of the bus voltage transformer and a secondary side switch control system, wherein the bus voltage transformer is connected with a bus, and the PT disconnecting link of the bus voltage transformer is connected between the bus voltage transformer and the bus; the secondary side switch is connected between the PT disconnecting link of the bus voltage transformer and the secondary equipment; the control loop comprises a positive electrode end, a plurality of working condition confirmation paths, a PT disconnecting link control path of the bus voltage transformer, a secondary side switch control path and a negative electrode end; the working condition confirmation paths, the PT disconnecting link control paths and the secondary side switch control paths of the bus voltage transformer are connected in parallel between the positive electrode end and the negative electrode end; the bus voltage transformer PT disconnecting link control path comprises a disconnecting link mechanism box, and the secondary side switch control path comprises a secondary side switch operating mechanism; the working condition confirmation passage is used for determining whether the control system is in a preset working condition and is conducted under the preset working condition; when the working condition confirmation passage is conducted, the control passage of the PT disconnecting link of the bus voltage transformer and the control passage of the secondary side switch under the corresponding working conditions are conducted, and the disconnecting link mechanism box and the secondary side switch operating mechanism are powered to control the disconnection or the connection of the PT disconnecting link of the bus voltage transformer and the secondary side switch; according to the technical scheme, the control loops of the PT disconnecting link of the bus voltage transformer and the secondary side switch are arranged, and when the opening and closing conditions are met, the control loops of the PT disconnecting link of the bus voltage transformer and the secondary side switch are conducted, and then the opening and closing of the PT disconnecting link of the bus voltage transformer and the secondary side switch can be automatically controlled, so that the situation that the PT disconnecting link of the bus voltage transformer and the secondary side switch are opened or closed when the opening and closing conditions are not met due to negligence when an operator manually opens and closes the opening and closing is avoided, hidden danger is left for the secondary side of the voltage transformer, the programming of opening and closing operation is realized, and the safety is improved.
Drawings
FIG. 1 is a schematic diagram of a bus connection according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a control loop of a PT switch and a secondary side switch of a bus voltage transformer according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The term "comprising" and variants thereof as used herein is intended to be open ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment".
It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between corresponding contents and not for defining a sequential or interdependent relationship.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.
Fig. 1 is a schematic diagram of bus connection provided by an embodiment of the present invention, fig. 2 is a schematic diagram of a bus voltage transformer PT knife switch and a secondary side switch control loop provided by an embodiment of the present invention, and referring to fig. 1 and 2, the bus voltage transformer PT is connected with a bus 1M, and a bus voltage transformer PT knife switch PTG is connected between the bus voltage transformer PT and the bus 1M; the secondary side switch ZK is connected between the bus voltage transformer PT disconnecting link PTG and the secondary equipment 10 and is a switch with a remote control function; the control loop comprises a positive electrode end A, a plurality of working condition confirmation paths 20, a bus voltage transformer PT disconnecting link control path 30, a secondary side switch control path and a negative electrode end 40; the working condition confirmation passages 20, the bus voltage transformer PT disconnecting link control passages 30 and the secondary side switch control passages 40 are connected in parallel between the positive electrode end A and the negative electrode end N; the bus voltage transformer PT disconnecting link control path comprises a disconnecting link mechanism box 301, and the secondary side switch control path 40 comprises a secondary side switch operating mechanism TM; the working condition confirmation path 20 is used for determining whether the control system is in a preset working condition and is conducted under the preset working condition; when the working condition confirmation passage 20 is conducted, the bus voltage transformer PT disconnecting link control passage 30 and the secondary side switch control passage 40 under corresponding working conditions are conducted, and the disconnecting link mechanism box 301 and the secondary side switch operating mechanism TM are powered on to control the bus voltage transformer PT disconnecting link PTG and the secondary side switch ZK to be disconnected or closed.
Specifically, referring to fig. 1 and 2, only if the busbar voltage transformer PT knife switch PTG and the secondary side switch ZK meet the opening and closing conditions, that is, are under the preset working conditions meeting the opening and closing conditions, the busbar voltage transformer PT knife switch PTG and the secondary side switch ZK can be controlled to be opened and closed, so that a plurality of working condition confirmation loops 20 are arranged, and only if the working conditions meeting the opening and closing conditions are met, the busbar voltage transformer PT knife switch control paths 30 and the secondary side switch control paths 40 under the corresponding working conditions are conducted when the working condition confirmation loops 20 are conducted, and the busbar voltage transformer PT knife switch control paths comprise a knife switch mechanism box 301, and the secondary side switch control paths 40 comprise a secondary side switch operation mechanism TM; when the bus voltage transformer PT disconnecting link control channel 30 and the secondary side switch control channel 40 are conducted, the corresponding disconnecting link mechanism box 301 and the secondary side switch operating mechanism TM are electrified to control the bus voltage transformer PT disconnecting link PTG and the secondary side switch ZK to be disconnected or closed.
The invention provides a PT disconnecting link of a bus voltage transformer and a secondary side switch control loop, which are applied to a PT disconnecting link of the bus voltage transformer and a secondary side switch control system, wherein the bus voltage transformer is connected with a bus, and the PT disconnecting link of the bus voltage transformer is connected between the bus voltage transformer and the bus; the secondary side switch is connected between the PT disconnecting link of the bus voltage transformer and the secondary equipment; the control loop comprises a positive electrode end, a plurality of working condition confirmation paths, a PT disconnecting link control path of the bus voltage transformer, a secondary side switch control path and a negative electrode end; the working condition confirmation paths, the PT disconnecting link control paths and the secondary side switch control paths of the bus voltage transformer are connected in parallel between the positive electrode end and the negative electrode end; the bus voltage transformer PT disconnecting link control path comprises a disconnecting link mechanism box, and the secondary side switch control path comprises a secondary side switch operating mechanism; the working condition confirmation passage is used for determining whether the control system is in a preset working condition and is conducted under the preset working condition; when the working condition confirmation passage is conducted, the control passage of the PT disconnecting link of the bus voltage transformer and the control passage of the secondary side switch under the corresponding working conditions are conducted, and the disconnecting link mechanism box and the secondary side switch operating mechanism are powered to control the disconnection or the connection of the PT disconnecting link of the bus voltage transformer and the secondary side switch; according to the technical scheme, the control loops of the PT disconnecting link of the bus voltage transformer and the secondary side switch are arranged, and when the opening and closing conditions are met, the control loops of the PT disconnecting link of the bus voltage transformer and the secondary side switch are conducted, and then the opening and closing of the PT disconnecting link of the bus voltage transformer and the secondary side switch can be automatically controlled, so that the situation that the PT disconnecting link of the bus voltage transformer and the secondary side switch are opened or closed when the opening and closing conditions are not met due to negligence when an operator manually opens and closes the opening and closing is avoided, hidden danger is left for the secondary side of the voltage transformer, the programming of opening and closing operation is realized, and the safety is improved.
Optionally, the preset working condition includes a closing working condition; the working condition confirmation channels comprise closing working condition confirmation channels; the bus voltage transformer PT disconnecting link control path comprises a switching-on working condition bus voltage transformer PT disconnecting link control path; the secondary side switch control path comprises a closing working condition secondary side switch control path; the switching-on working condition confirmation path comprises a switching-on intermediate relay ZJ1 and a switching-on delay intermediate relay ZT1; the normally open contact ZJ11-2 of the switching-on intermediate relay ZJ1 is positioned in a PT disconnecting link control path of the bus voltage transformer; the normally open contact ZT11-2 of the switching-on delay intermediate relay ZT1 is positioned in a secondary side switch control path; when the switching-on working condition confirms that the passage is conducted, the switching-on intermediate relay ZJ1 and the switching-on delay intermediate relay ZT1 are powered on, and a normally open contact ZJ11-2 of the switching-on intermediate relay ZJ1 and a normally open contact ZT11-2 of the switching-on delay intermediate relay ZT1 are sequentially closed; the control channel of the PT disconnecting link of the bus voltage transformer and the control channel of the secondary side switch are sequentially conducted, and the disconnecting link mechanism box 301 and the secondary side switch operating mechanism TM are sequentially electrified so as to control the PT disconnecting link of the bus voltage transformer and the secondary side switch ZK to be sequentially switched on. The knife switch mechanism box 301 comprises a first switch-on signal input end X1; the secondary side switch operating mechanism TM comprises a second closing signal input end 2; the normally open contact ZJ11-2 of the switching-on intermediate relay ZJ1 is connected with the first switching-on signal input end X1; the normally open contact ZT11-2 of the switching-on delay intermediate relay ZT1 is connected with the second switching-on signal input end 2; under a closing working condition, the knife switch mechanism box 301 obtains electricity from a first closing signal input end X1; the secondary side switch operating mechanism is electrified from the second closing signal input end 2.
Specifically, when the bus is required to transmit power, the bus voltage transformer PT knife switch PTG is required to be switched on, and then the secondary side switch ZK is required to be switched on; referring to fig. 2, a switching-on intermediate relay ZJ1 and a switching-on delay intermediate relay ZT1 are arranged in a switching-on working condition confirmation path, and a normally open contact ZJ11-2 of the switching-on intermediate relay ZJ1 is positioned in a bus voltage transformer PT knife switch control path; the normally open contact ZT11-2 of the switching-on delay intermediate relay ZT1 is positioned in a secondary side switch control path; when the switching-on working condition is met currently, the switching-on working condition confirms that the passage is conducted, at this time, the switching-on intermediate relay ZJ1 and the switching-on delay intermediate relay ZT1 are powered on, the normally open contact ZJ11-2 of the corresponding switching-on intermediate relay ZJ1 and the normally open contact ZT11-2 of the switching-on delay intermediate relay ZT1 are sequentially closed, and the time for delay closing of the switching-on delay intermediate relay ZT1 can be 40 seconds, so that the bus voltage transformer PT switch control passage 30 and the secondary side switch control passage 40 are conducted sequentially, the switch mechanism box 301 is powered on from the first switching-on signal input end X1, and the secondary side switch operating mechanism TM is powered on from the second switching-on signal input end 2 to control the bus voltage transformer switch PTG and the secondary side switch ZK to be sequentially switched on.
Optionally, the preset working condition includes a brake-off working condition; the working condition confirmation passage comprises a brake-separating working condition confirmation passage; the bus voltage transformer PT disconnecting link control path comprises a disconnecting link working condition bus voltage transformer PT disconnecting link control path; the secondary side switch control passage comprises a secondary side switch control passage under a brake-separating working condition; the opening working condition confirmation path comprises an opening intermediate relay ZJ2 and an opening delay intermediate relay ZT2; the normally open contact ZJ21-2 of the switching-off intermediate relay ZJ2 is positioned in the secondary side switch control path; the normally open contact ZT21-2 of the switching-off delay intermediate relay ZT2 is positioned in a PT disconnecting link control path of the bus voltage transformer; when the opening working condition confirms that the passage is conducted, the opening intermediate relay ZJ2 and the opening delay intermediate relay ZT2 are powered on, and a normally open contact ZJ21-2 of the opening intermediate relay ZJ2 and a normally open contact ZT21-2 of the opening delay intermediate relay ZT2 are sequentially closed; the secondary side switch control path 40 and the bus voltage transformer PT disconnecting link control path 30 are sequentially conducted, and the secondary side switch operating mechanism and the disconnecting link mechanism box are sequentially electrified so as to control the secondary side switch ZK and the bus voltage transformer PT disconnecting link PTG to be sequentially disconnected. The disconnecting link mechanism box 301 includes a first disconnecting link signal input terminal X2; the secondary side switch operating mechanism TM comprises a second switching-off signal input end 4; the normally open contact ZJ21-2 of the switching-off intermediate relay ZJ2 is connected with the second switching-off signal input end 4; the normally open contact ZT21-2 of the switching-off delay intermediate relay ZT2 is connected with a first switching-off signal input end X2; under the opening working condition, the disconnecting link mechanism box obtains electricity from a first opening signal input end X2; the secondary side switch operating mechanism TM receives power from the second switching signal input terminal 4.
Specifically, when the bus voltage transformer PT fails or the bus 1M needs to be subjected to power failure maintenance, the bus voltage transformer PT needs to be shut down, whether a brake-separating working condition is met at present needs to be judged at the moment, and when the brake-separating working condition is met, the secondary side switch ZK needs to be disconnected firstly, and then the bus voltage transformer PT knife switch PTG needs to be disconnected; therefore, a brake-separating intermediate relay ZJ2 and a brake-separating delay intermediate relay ZT2 are arranged on the brake-separating working condition confirmation path; the normally open contact ZJ21-2 of the switching-off intermediate relay ZJ2 is positioned in the secondary side switch control path; the normally open contact ZT21-2 of the switching-off delay intermediate relay ZT2 is positioned in a PT disconnecting link control path of the bus voltage transformer; when the opening working condition is met, the opening working condition confirms that the passage is conducted, an opening intermediate relay ZJ2 and an opening delay intermediate relay ZT2 in the passage are powered on, a normally open contact ZJ21-2 of the corresponding opening intermediate relay ZJ2 and a normally open contact ZT21-2 of the opening delay intermediate relay ZT2 are sequentially closed, so that the secondary side switch control passage 40 and the bus voltage transformer PT disconnecting link control passage 30 are sequentially conducted, and the disconnecting link mechanism box 301 is powered on from the first opening signal input end X2; the secondary side switch operating mechanism TM is powered on from the second switching-off signal input end 4 so as to control the secondary side switch ZK and the bus voltage transformer PT switch PTG to be switched off successively.
In an alternative embodiment of the invention, the control system comprises a far-near working condition switching handle, a near-control closing button and a five-prevention lock; the closing working conditions comprise a close control closing working condition; the closing working condition confirmation passage comprises a close control closing working condition confirmation passage; the close-control closing working condition confirmation path comprises a closing intermediate relay ZJ1, a closing delay intermediate relay ZT1, a normally closed contact QK11-2 of a far-near working condition switching handle, a normally open contact WF 3-4 of a five-prevention lock and a normally open contact HA3-4 of a close-control closing button; when the close-control closing working condition confirms that the passage is conducted, the normally closed contact QK11-2 of the far-near working condition switching handle, the normally open contact WF 3-4 of the five-prevention lock and the normally open contact HA3-4 of the close-control closing button are closed; the switching-on intermediate relay ZJ1 and the switching-on delay intermediate relay ZT1 are powered on.
Specifically, referring to fig. 2, a user can switch the current working condition to a near control position through a far and near working condition switching handle, press a near control closing button, insert a five-prevention lock, close a normally closed contact QK11-2 of the far and near working condition switching handle in a near control closing working condition confirmation path at this time, close a normally open contact WF 3-4 of the five-prevention lock, close a normally open contact HA 3-4 of the near control closing button, and conduct the near control closing working condition confirmation path at this time, wherein a switching-off intermediate relay ZJ2 and a switching-off delay intermediate relay ZT2 are powered on.
In an alternative embodiment of the present invention, the control system further comprises a close control brake release button; the brake-separating working condition comprises a close control brake-separating working condition; the brake-off working condition confirmation passage comprises a close control brake-off working condition confirmation passage; the close control opening working condition confirmation path comprises an opening intermediate relay ZJ2, an opening delay intermediate relay ZT2, a normally closed contact QK11-2 of a far and near working condition switching handle, a normally open contact WF 3-4 of a five-prevention lock and a normally open contact FA3-4 of a close control opening button; when the close control opening working condition confirms that the passage is conducted, the normally closed contact QK11-2 of the far and near working condition switching handle, the normally open contact WF 3-4 of the five-prevention lock and the normally open contact FA3-4 of the close control opening button are closed; the switching-off intermediate relay ZJ2 and the switching-off delay intermediate relay ZT2 are powered on.
Specifically, the control system comprises a PT terminal box, a close control brake-separating button is located on the PT terminal box, a user can switch the current working condition to a close control position through a far and near working condition switching handle, the close control brake-separating button is pressed, a five-prevention lock is inserted, at the moment, a normally closed contact QK11-2 of the far and near working condition switching handle in a close control brake-separating working condition confirmation passage is closed, a normally open contact WF 3-4 of the five-prevention lock is closed, a normally open contact FA3-4 of the close control brake-separating button is closed, at the moment, the close control brake-separating working condition confirmation passage is conducted, and a brake-separating intermediate relay ZJ2 and a brake-separating delay intermediate relay ZT2 are electrified. In an alternative embodiment of the invention, the PT terminal box is further provided with a scram button, during normal operation, the scram button is not pressed, the normally closed contacts TA 1-2 thereof are closed, when an abnormal condition occurs during operation, and the current opening and closing operation needs to be stopped immediately, the scram button is pressed, the normally closed contacts TA 1-2 thereof are opened, and the PT knife switch control loop of the bus voltage transformer is cut off.
Optionally, the control system further comprises a measurement and control device; the measurement and control device comprises a remote control closing relay; the switching-on working conditions comprise a remote control switching-on working condition; the closing working condition confirmation passage comprises a remote control closing working condition confirmation passage; the remote control closing working condition confirmation path comprises a closing intermediate relay ZJ1, a closing delay intermediate relay ZT1, a normally open contact QK13-4 of a remote and near working condition switching handle and a normally open contact YH 3-4 of the remote control closing relay; when the long-distance control switching-on working condition confirms that the passage is conducted, the normally open contact QK13-4 of the long-distance working condition switching handle and the normally open contact YH 3-4 of the long-distance control switching-on relay are closed; the switching-on intermediate relay ZJ1 and the switching-on delay intermediate relay ZT1 are powered on.
Specifically, the control system further comprises a remote control mode, when the remote and near working condition switching handle is switched to remote control, the measurement and control device can control the PT disconnecting link PTG of the bus voltage transformer at the moment, namely when the measurement and control device receives a remote control switching command, the normally open contact YH 3-4 of the remote control switching relay is closed, the normally open contact QK13-4 of the remote and near working condition switching handle is closed, and the switching-on intermediate relay ZJ1 and the switching-on delay intermediate relay ZT1 are electrified.
Optionally, the measurement and control device comprises a remote control brake-separating relay; the brake-separating working condition comprises a remote control brake-separating working condition; the opening working condition confirmation passage comprises a remote control opening working condition confirmation passage; the remote control opening working condition confirmation path comprises an opening intermediate relay ZJ2, an opening delay intermediate relay ZT2, a normally open contact QK13-4 of a remote and near working condition switching handle and a normally open contact YF 3-4 of the remote control opening relay; when the remote control opening working condition confirms that the passage is conducted, the normally open contact QK13-4 of the remote control opening relay YF and the normally open contact YF 3-4 of the remote control opening relay YF are closed; the switching-off intermediate relay ZJ2 and the switching-off delay intermediate relay ZT2 are powered on.
Specifically, an operator sends a brake separating command through a measurement and control device at a background machine or a measurement and control screen, a normally open contact QK13-4 of a far and near working condition switching handle and a normally open contact YF 3-4 of a far control brake separating relay are arranged in a loop, when the contacts are closed, the far control brake separating working condition is met, a far control brake separating working condition confirmation passage is conducted, at the moment, a brake separating intermediate relay ZJ2 and a brake separating delay intermediate relay ZT2 in the passage are electrified, and then the secondary side switch ZK and a PT switch PTG of a bus voltage transformer can be controlled. In an alternative embodiment of the present invention, the measurement and control device further includes a remote emergency stop relay for the knife switch, referring to fig. 2, when the measurement and control device does not receive an emergency stop command in a normal operation process, the normally closed contact YT 1-2 is closed, when an abnormal condition occurs in the operation process, and when the current opening and closing operation needs to be stopped immediately, the normally closed contact YT 1-2 is opened to cut off the knife switch control loop of the bus voltage transformer PT.
Optionally, referring to fig. 1, a busbar ground blade J00 is connected between the busbar 1M and the ground terminal; a bus voltage transformer PT grounding knife PT0 is connected between the bus voltage transformer and the grounding end; the control system also comprises an air switch; the working condition confirmation passage comprises normally open contacts ZK41-2 and ZK43-4 of the air switch; the working condition confirmation passage is conducted when the normally open contact of the air switch is closed; the control path of the bus voltage transformer PT knife switch also comprises a normally-closed contact PT01-2 of the grounding knife PT0 and a normally-closed contact J001-2 of the bus grounding knife; when the working condition confirmation passage is conducted and the normally-closed contact PT01-2 of the PT ground knife and the normally-closed contact J001-2 of the bus ground knife are closed, the control passage of the PT disconnecting link of the bus voltage transformer is conducted.
Specifically, referring to fig. 2, only when the air switch is in a closed state and the ground knife PT0 and the bus ground knife J00 are in open positions, the secondary side switch ZK and the bus voltage transformer PT knife PTG can be controlled to be opened and closed, so that the working condition confirmation path is further provided with normally open contacts ZK41-2 and ZK43-4 of the air switch, the bus voltage transformer PT knife control path further comprises normally closed contacts PT01-2 of the ground knife PT0 and normally closed contacts J001-2 of the bus ground knife, the working condition confirmation path is conducted when the normally open contacts ZK41-2 and ZK43-4 of the air switch are closed, and the bus voltage transformer PT knife control path is conducted when the normally closed contacts PT01-2 of the PT ground knife and the normally closed contacts J001-2 of the bus ground knife are closed.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The control circuit is characterized in that the control circuit is applied to a bus voltage transformer PT disconnecting link and a secondary side switch control system, the bus voltage transformer is connected with a bus, and the bus voltage transformer PT disconnecting link is connected between the bus voltage transformer and the bus; the secondary side switch is connected between the PT disconnecting link of the bus voltage transformer and secondary equipment;
The control loop comprises a positive electrode end, a plurality of working condition confirmation paths, a plurality of PT disconnecting link control paths of the bus voltage transformer, a plurality of secondary side switch control paths and a negative electrode end; the working condition confirmation paths, the bus voltage transformer PT disconnecting link control paths and the secondary side switch control paths are connected in parallel between the positive electrode end and the negative electrode end; the PT disconnecting link control path of the bus voltage transformer comprises a disconnecting link mechanism box, and the secondary side switch control path comprises a secondary side switch operating mechanism;
The working condition confirmation passage is used for determining whether the control system is in a preset working condition and is conducted under the preset working condition; when the working condition confirmation passage is conducted, the bus voltage transformer PT disconnecting link control passage and the secondary side switch control passage under corresponding working conditions are conducted, and the disconnecting link mechanism box and the secondary side switch operating mechanism are powered to control the bus voltage transformer PT disconnecting link and the secondary side switch to be disconnected or closed.
2. The control circuit of claim 1, wherein the preset operating condition comprises a closing operating condition; the working condition confirmation channels comprise closing working condition confirmation channels; the bus voltage transformer PT disconnecting link control path comprises a switching-on working condition bus voltage transformer PT disconnecting link control path; the secondary side switch control path comprises a closing working condition secondary side switch control path;
The switching-on working condition confirmation passage comprises a switching-on intermediate relay and a switching-on delay intermediate relay; the normally open contact of the switching-on intermediate relay is positioned in a PT disconnecting link control path of the bus voltage transformer under the switching-on working condition; the normally open contact of the switching-on delay intermediate relay is positioned in the switching-on working condition secondary side switch control path;
When the switching-on working condition confirms that the passage is conducted, the switching-on intermediate relay and the switching-on delay intermediate relay are powered on, and a normally open contact of the switching-on intermediate relay and a normally open contact of the switching-on delay intermediate relay are sequentially closed; and the PT disconnecting link control path of the bus voltage transformer under the switching-on working condition and the secondary side switch control path of the bus voltage transformer under the switching-on working condition are sequentially conducted, and the disconnecting link mechanism box and the secondary side switch operating mechanism are sequentially electrified so as to control the PT disconnecting link of the bus voltage transformer and the secondary side switch to be sequentially switched on.
3. The control circuit of claim 2, wherein the knife switch mechanism housing includes a first switch-on signal input; the secondary side switch operating mechanism comprises a second switching-on signal input end;
The normally open contact of the switching-on intermediate relay is connected with the first switching-on signal input end; the normally open contact of the switching-on delay intermediate relay is connected with the second switching-on signal input end;
under the switching-on working condition, the disconnecting link mechanism box obtains electricity from the first switching-on signal input end; the secondary side switch operating mechanism obtains electricity from the second switching-on signal input end.
4. The control circuit of claim 2, wherein the preset operating condition comprises a split operating condition; the working condition confirmation passage comprises a brake-separating working condition confirmation passage; the bus voltage transformer PT disconnecting link control path comprises a bus voltage transformer PT disconnecting link control path under a disconnecting link working condition; the secondary side switch control path comprises a secondary side switch control path under a brake-separating working condition;
The opening working condition confirmation path comprises an opening intermediate relay and an opening delay intermediate relay; the normally open contact of the brake-separating intermediate relay is positioned in the secondary side switch control path of the brake-separating working condition; the normally open contact of the switching-off delay intermediate relay is positioned in a PT disconnecting link control path of the bus voltage transformer under the switching-off working condition;
When the opening working condition confirms that the passage is conducted, the opening intermediate relay and the opening delay intermediate relay are powered on, and a normally open contact of the opening intermediate relay and a normally open contact of the opening delay intermediate relay are closed successively; the secondary side switch control channel of the disconnecting link working condition and the disconnecting link control channel of the bus voltage transformer are sequentially conducted, and the secondary side switch operating mechanism and the disconnecting link mechanism box are sequentially powered so as to control the secondary side switch and the bus voltage transformer to be disconnected sequentially.
5. The control loop of claim 4, wherein the knife switch mechanism housing includes a first switch-off signal input; the secondary side switch operating mechanism comprises a second brake separating signal input end;
the normally open contact of the switching-off intermediate relay is connected with the second switching-off signal input end; the normally open contact of the switching-off delay intermediate relay is connected with the first switching-off signal input end;
Under the opening working condition, the disconnecting link mechanism box obtains electricity from the first opening signal input end; the secondary side switch operating mechanism obtains electricity from the second brake separating signal input end.
6. The control loop according to claim 4, wherein the control system comprises a far and near working condition switching handle, a near control closing button and a five-prevention lock; the closing working conditions comprise a close control closing working condition; the closing working condition confirmation passage comprises a close control closing working condition confirmation passage;
The close-control closing working condition confirmation path comprises a closing intermediate relay, a closing delay intermediate relay, a normally closed contact of the far-near working condition switching handle, a normally open contact of a five-prevention lock and a normally open contact of a close-control closing button;
When the close-control closing working condition confirms that the passage is conducted, the normally closed contact of the far-near working condition switching handle, the normally open contact of the five-prevention lock and the normally open contact of the close-control closing button are closed; and the switching-on intermediate relay and the switching-on delay intermediate relay are powered on.
7. The control loop of claim 6, wherein the control system further comprises a close-controlled brake release button; the brake-separating working condition comprises a close control brake-separating working condition; the brake-off working condition confirmation passage comprises a close control brake-off working condition confirmation passage;
the close control opening working condition confirmation path comprises the opening intermediate relay, an opening delay intermediate relay, a normally closed contact of the far and near working condition switching handle, a normally open contact of a five-prevention lock and a normally open contact of the close control opening button;
When the close control opening working condition confirms that the passage is conducted, the normally closed contact of the far and near working condition switching handle, the normally open contact of the five-prevention lock and the normally open contact of the close control opening button are closed; and the switching-off intermediate relay and the switching-off delay intermediate relay are powered on.
8. The control loop of claim 6, wherein the control system further comprises a measurement and control device; the measurement and control device comprises a remote control closing relay; the switching-on working conditions comprise a remote control switching-on working condition; the closing working condition confirmation passage comprises a remote control closing working condition confirmation passage;
the remote control closing working condition confirmation path comprises a closing intermediate relay, a closing delay intermediate relay, a normally open contact of the far and near working condition switching handle and a normally open contact of the remote control closing relay;
when the remote control switching-on working condition confirms that the passage is conducted, the normally open contact of the remote control switching-on relay is closed; and the switching-on intermediate relay and the switching-on delay intermediate relay are powered on.
9. The control loop of claim 8, wherein the measurement and control device comprises a remote control brake release relay; the brake-separating working condition comprises a remote control brake-separating working condition; the opening working condition confirmation passage comprises a remote control opening working condition confirmation passage;
the remote control opening working condition confirmation path comprises the opening intermediate relay, an opening delay intermediate relay, a normally open contact of a far and near working condition switching handle and a normally open contact of a remote control opening relay;
When the remote control opening working condition confirms that the passage is conducted, the normally open contact of the remote control opening relay is closed; and the switching-off intermediate relay and the switching-off delay intermediate relay are powered on.
10. The control loop of claim 1, wherein a busbar ground blade is connected between the busbar and ground; a PT grounding knife of the bus voltage transformer is connected between the bus voltage transformer and the grounding end; the control system further comprises an air switch;
the working condition confirmation path comprises a normally open contact of the air switch; the working condition confirmation passage is conducted when the normally open contact of the air switch is closed;
The control path of the PT disconnecting link of the bus voltage transformer further comprises a normally-closed contact of the PT grounding knife and a normally-closed contact of the bus grounding knife; and when the working condition confirmation passage is conducted and the normally-closed contact of the PT grounding knife and the normally-closed contact of the bus grounding knife are closed, the control passage of the PT knife switch of the bus voltage transformer is conducted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311818038.5A CN118017676A (en) | 2023-12-27 | 2023-12-27 | PT disconnecting link of bus voltage transformer and secondary side switch control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311818038.5A CN118017676A (en) | 2023-12-27 | 2023-12-27 | PT disconnecting link of bus voltage transformer and secondary side switch control loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118017676A true CN118017676A (en) | 2024-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311818038.5A Pending CN118017676A (en) | 2023-12-27 | 2023-12-27 | PT disconnecting link of bus voltage transformer and secondary side switch control loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118017676A (en) |
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2023
- 2023-12-27 CN CN202311818038.5A patent/CN118017676A/en active Pending
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