CN110880742A - High-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure - Google Patents
High-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure Download PDFInfo
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- CN110880742A CN110880742A CN201911277430.7A CN201911277430A CN110880742A CN 110880742 A CN110880742 A CN 110880742A CN 201911277430 A CN201911277430 A CN 201911277430A CN 110880742 A CN110880742 A CN 110880742A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention provides a high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure which comprises a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay arranged on a tripping relay circuit in a relay protection screen circuit breaker operation box in advance; the starting circuit introduces positive electricity into the positive and negative ends of the coil of the time relay and introduces the positive and negative ends of the coil of the tripping relay through the normally open time contact of the time relay to be respectively negative; meanwhile, a normally open contact of the tripping relay is connected with the high-voltage circuit breaker to form a loop; when the three-phase on-off state of the high-voltage circuit breaker is asynchronous, the starting loop is automatically switched on, and the time relay is electrified and started in a delayed mode to enable the normally open contact of the tripping relay to be closed, so that the three-phase tripping of the high-voltage circuit breaker is realized. By implementing the invention, the three-phase inconsistent protection circuit of the high-voltage circuit breaker body is improved, the reliability of protection action is improved, and misoperation and operation failure in operation are prevented.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a three-phase inconsistent protection secondary circuit structure of a high-voltage circuit breaker body.
Background
As shown in fig. 1, in the high-voltage circuit breaker main body three-phase inconsistent protection secondary circuit, circuit breaker normally closed auxiliary contacts DLA to DLC are connected in parallel and normally open auxiliary contacts DLA to DLc are connected in parallel, and then connected in series to form a circuit breaker three-phase inconsistent starting circuit. When the circuit breaker normally operates, three phases of the circuit breaker are in a closing state or a breaking state, only one of normally-opened auxiliary contacts DLA-DLC or normally-closed auxiliary contacts DLa-DLc of the circuit breaker is in a breaking state, at the moment, a three-phase inconsistent starting circuit is broken, positive electricity + KM of a control power supply is cut off, a three-phase inconsistent protection time delay relay SJ coil is in a power-off state, and normally-opened time delay contacts 15-18 of the three-phase inconsistent protection time delay relay are in a breaking state. Only when the three-phase states of the circuit breaker are inconsistent, a three-phase inconsistent starting loop consisting of a normally open auxiliary contact and a normally closed auxiliary contact of the circuit breaker is switched on, positive electricity + KM of a control power supply is added to the positive electricity end of a coil of a SJ delay relay, so that the coil is electrified and excited, and then the control power supply is further led to a coil of an outlet intermediate relay SZJ, so that the circuit breaker is tripped by excitation action of the outlet intermediate relay SZJ.
However, the model and quality level of the selected delay relay SJ and the port intermediate relay SZJ are not uniform, and the delay relay SJ and the port intermediate relay SZJ are installed in the circuit breaker control box along with primary equipment, so that severe environmental factors such as high temperature and humidity, large mechanical vibration, strong electromagnetic interference and the like are tested in operation, and the operation reliability of the delay relay SJ and the port intermediate relay SZJ is poor. In actual operation, compared with environmental factors, the influence of factors such as electrical wear and mechanical wear on the reliability of the delay relay SJ and the port intermediate relay SZJ is small, and the influence can be ignored during analysis.
A large number of statistics have shown that line faults account for about 90% of short-circuit faults in high-voltage networks, whereas single-phase ground faults account for about 90% of line faults. When a single-phase instantaneous ground fault occurs on a line of 220kV or above, when a protection phase selection tripping operation occurs or a certain phase of a circuit breaker generates a stealing tripping operation in a normal operation state, a 0.8 second reclosing action closes a tripping-phase circuit breaker in a normal condition, and the line recovers to operate normally.
Actual operation conditions show that the three-phase inconsistent protection of the high-voltage circuit breaker body in fig. 1 is unreasonable in that due to the fact that the operation environment is severe, time relay SJ is shortened in delay or time relay SJ is normally opened, delay contacts 15-18 are abnormally switched on when being wetted, once the circuit breaker is in a three-phase inconsistent state after phase selection and tripping, the three-phase inconsistent protection can trip the three phases of the circuit breaker before reclosing action to cause reclosing discharge, the circuit breaker loses the opportunity of reclosing, and even two interconnected regional power grids are disconnected. Meanwhile, the high-voltage circuit breaker body in fig. 1 may also cause the delay of the delay relay SJ to be lengthened or the normally open delay contacts 15-18 of the time relay SJ to be disconnected due to the damaged coil, or may cause the damage of the coil of the outlet intermediate relay SZJ and the corresponding normally open contact, which may cause the unreliable operation under the condition of requiring the three-phase inconsistent protection operation of the circuit breaker, and may cause the zero-sequence overcurrent backup protection override trip of the adjacent line or the main transformer protection device, and the power failure range to be enlarged, because of the bad operation environment.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure, improve a high-voltage circuit breaker body three-phase inconsistent protection circuit, effectively solve the problems of the high-voltage circuit breaker body three-phase inconsistent protection circuit in the prior art, improve the reliability of protection action, and prevent misoperation and operation rejection in operation.
In order to solve the technical problem, the embodiment of the invention provides a high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure, which comprises a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay preset on a tripping relay circuit in a relay protection screen circuit breaker operation box; wherein the content of the first and second substances,
the input end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with the positive electricity of a preset control power supply, one output end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with the coil positive electricity end of the time relay, and the other output end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with one end of a normally open time contact of the time relay;
the negative end of a coil of the time relay is connected with the negative electricity of a preset control power supply, and the other end of a normally open time contact of the time relay is connected with the positive end of the coil of the tripping relay;
the negative electricity end of a coil of the tripping relay is connected with the negative electricity of the preset control power supply, and a normally open contact of the tripping relay is connected with a high-voltage circuit breaker in the circuit breaker control box to form a loop;
when the three-phase opening and closing states of the high-voltage circuit breaker are asynchronous, the three-phase inconsistent starting circuit of the high-voltage circuit breaker is automatically switched on, so that the time relay is electrified and started in a delayed mode, the normally open time contact of the time relay is closed to drive the normally open contact of the tripping relay to be closed, and the three-phase tripping of the high-voltage circuit breaker is realized.
The time relay comprises a time relay body, a plurality of normally open time contacts and a plurality of normally open time contacts, wherein the number of the normally open time contacts of the time relay body is two, and the two normally open time contacts of the time relay body are connected in series.
The tripping relay loop comprises three tripping relays, and the three tripping relays are connected in series.
The embodiment of the invention also provides another high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure which comprises two protection branch structures connected in parallel, wherein each protection branch structure comprises a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay pre-arranged on a tripping relay circuit in a relay protection screen circuit breaker operation box; wherein the content of the first and second substances,
in each protection branch structure, the input end of a three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected with the positive electricity of a corresponding preset control power supply, one output end of the high-voltage inconsistent starting circuit is connected with the positive electricity end of a coil of a corresponding time relay, and the other output end of the high-voltage inconsistent starting circuit is connected with one end of a normally open time contact of the corresponding time relay;
in each protection branch structure, the negative end of a coil of a time relay is connected with the negative electricity of a corresponding preset control power supply, and the other end of a normally open time contact is connected with the positive end of the coil of the corresponding trip relay;
in each protection branch structure, the negative electricity end of a coil of a tripping relay is connected with the negative electricity of a corresponding preset control power supply, and normally open contacts are connected with a high-voltage circuit breaker in a circuit breaker control box to form a loop;
when the three-phase opening and closing states of the high-voltage circuit breakers are asynchronous, each three-phase inconsistent starting circuit of each high-voltage circuit breaker is automatically switched on, each time relay is enabled to be powered on and started in a delayed mode, the normally open time contact of each time relay is enabled to be closed to drive the normally open contact of the corresponding tripping relay to be closed, and three-phase tripping of the high-voltage circuit breakers is achieved.
The time relay comprises a plurality of time relays, wherein the number of normally open time contacts of each time relay is two, and the two normally open time contacts in each time relay are correspondingly connected in series.
The number of the tripping relays on each tripping relay loop is three, and the three tripping relays on each tripping relay loop are connected in series.
The embodiment of the invention has the following beneficial effects:
1. the invention breaks through the traditional design that components such as a delay relay for three-phase inconsistent protection of a high-voltage circuit breaker body, an outlet tripping intermediate relay and the like which are operated in a split-phase mode for a long time are installed in a local control cubicle, and the components are installed in a relay protection screen, so that the advantages of controllable temperature and humidity, small mechanical vibration, weak electromagnetic interference and the like in the relay protection cubicle are fully utilized, the operating environment of the components such as the delay relay for three-phase inconsistent protection of the body is effectively improved, and the operating reliability of the components is improved;
2. the invention provides an outlet tripping intermediate relay for canceling the three-phase inconsistent protection of a high-voltage circuit breaker body for the first time, and a normally open contact of a time delay relay is directly connected to a tripping relay on a tripping relay loop (not starting failure and not starting reclosing) in an operation box of a relay protection screen circuit breaker, so that the design of the three-phase tripping function of the high-voltage circuit breaker is realized, a secondary loop is simplified, and the reliability of protection action is improved;
3. in order to improve the reliability of protection action, the invention follows a dual design principle, two time relay excitation coils are respectively connected into two groups of high-voltage circuit breaker three-phase inconsistent starting loops, two groups of normally open time contacts of each time relay are connected in series and then are respectively connected into the tripping relays on two tripping relay loops in a relay protection screen circuit breaker operation box, and the invention can effectively prevent protection misoperation caused by the abnormity of a single relay contact and protection failure operation caused by the fault of one group of control power supplies.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic connection diagram of a three-phase inconsistent protection secondary circuit of a high-voltage circuit breaker body in the prior art;
fig. 2 is a schematic connection diagram of a three-phase inconsistent protection secondary circuit structure of a high-voltage circuit breaker body according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of a tripping relay loop in the operation box of the relay protection screen circuit breaker corresponding to the tripping relay in FIG. 2;
fig. 4 is a schematic connection diagram of another three-phase inconsistent protection secondary circuit structure of a high-voltage circuit breaker body according to a second embodiment of the present invention;
fig. 5 is a schematic connection diagram of a tripping relay loop in the operation box of the relay protection screen circuit breaker corresponding to the tripping relay in fig. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The inventor discovers that because the circuit breaker control box often sets up in the open air for the time delay relay and the mouth auxiliary relay of the inconsistent protection secondary circuit of high voltage circuit breaker body three-phase in the current circuit breaker control box receive the influence of adverse environmental factors such as high temperature, humidity, mechanical vibration are great, high electromagnetic interference great, make the inconsistent protection of three-phase can jump off the circuit breaker three-phase before reclosing action and cause reclosing discharge or the circuit breaker three-phase is inconsistent to be moved under the protection action circumstances. Therefore, the inventor improves the three-phase inconsistent protection circuit of the high-voltage circuit breaker body, improves components such as a relay of the three-phase inconsistent protection secondary circuit of the high-voltage circuit breaker body in the circuit breaker control box into the relay protection screen, effectively controls the temperature, the humidity and other problems of the working environment by utilizing facilities such as an air conditioner of the relay protection screen, and meanwhile can effectively solve the problem of large mechanical vibration interference during the opening and closing operation of the circuit breaker.
As shown in fig. 2 and fig. 3, in the first embodiment of the present invention, the inventor provides a three-phase inconsistent protection secondary circuit structure of a high-voltage circuit breaker body, which includes a three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker arranged in a circuit breaker control box, a time relay SJ1 arranged in a relay protection room protection screen, and a trip relay 11TJF preset on a trip relay circuit TJF in a relay protection room protection screen circuit breaker operation box; it should be noted that the three-phase inconsistent starting loop S1 of the high-voltage circuit breaker is formed by connecting the normally closed auxiliary contacts DLA-DLC of the existing circuit breaker in parallel and connecting the normally open auxiliary contacts DLa-DLc in parallel and then connecting the normally closed auxiliary contacts DLA-DLc in series, the time relay SJ1 and the tripping relay 11TJF are improved into a relay protection screen, and the tripping relay 11TJF is the existing relay protection screen and does not need to be additionally installed; wherein the content of the first and second substances,
the input end of a three-phase inconsistent starting loop S1 of the high-voltage circuit breaker is connected with positive electricity 101 of a preset control power supply, one output end of the three-phase inconsistent starting loop S1 is connected with a coil positive electricity end A1 of a time relay SJ1, and the other output end of the three-phase inconsistent starting loop S1 is connected with one end of a normally open time contact (for example, two normally open time contacts which are connected in series are SJ1-5 and SJ1-8 respectively, and SJ1-15 and SJ1-18) of the time relay SJ 1; of course, the normally open time contact of time relay SJ1 can be one (e.g., SJ1-5 and SJ1-8, or SJ1-15 and SJ 1-18);
the negative coil electric end A2 of the time relay SJ1 is connected with the negative electricity 102 of a preset control power supply, and the other end of a normally open time contact (for example, two normally open time contacts which are connected in series are SJ1-5, SJ1-8, SJ1-15 and SJ1-18 respectively) is connected with the positive coil electric end A3 of the trip relay 11 TJF;
a coil negative electricity end A4 of the trip relay 11TJF is connected with a negative electricity 102 of a preset control power supply, and a normally open contact of the trip relay is connected with a high-voltage circuit breaker in a circuit breaker control box to form a loop (not shown);
when the three-phase opening and closing states of the high-voltage circuit breaker are asynchronous, the three-phase inconsistent starting loop S1 of the high-voltage circuit breaker is automatically switched on, so that the time relay SJ1 is electrified and started in a delayed mode, and the normally open time contact of the time relay SJ1 is closed (for example, two serially connected SJ1-5 and SJ1-8 and SJ1-15 and SJ1-18 are closed simultaneously) to drive the normally open contact of the tripping relay 11TJF to be closed, so that the three-phase tripping of the high-voltage circuit breaker is realized.
It can be understood that, in fig. 3, there are three trip relays (e.g. 11TJF, 12TJF, and 13TJF) on the trip relay loop, and the three trip relays (e.g. 11TJF, 12TJF, and 13TJF) are connected in series to form a three-trip relay, which can implement a three-phase simultaneous trip function without starting failure and simultaneously lock reclosure when acting. At this time, terminal 4Q1D23 is directly connected to the normally open time contact of time relay SJ1 as in fig. 3.
The working principle of the high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure in the first embodiment of the invention is that when the high-voltage circuit breaker is in a three-phase closing state, three-phase normally-closed auxiliary contacts DLA-DLC on a high-voltage circuit breaker three-phase inconsistent starting circuit S1 are disconnected; when the high-voltage circuit breaker is in a three-phase opening state, three-phase normally-open auxiliary contacts DLa-DLc on a three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker are disconnected. Under the two normal conditions, the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker is normally disconnected, and the coil of the time relay SJ1 is powered off, so that the time delay function is not started.
However, when the three-phase inconsistent starting loop S1 of the high-voltage circuit breaker is switched on, the positive control power supply 101 is led to the end A1 of the time relay SJ1, the rated working voltage is applied to the two ends of the coil of the time relay SJ1, the delay function is started, the normally-opened delay contacts SJ1-5 and SJ1-8, SJ1-15 and SJ1-18 are immediately closed and conducted after the time exceeds a set value, the positive control power supply 101 is led to the positive tripping relay 11TJF end A3 on the tripping relay loop TJF in the operation box of the relay protection panel circuit breaker, the rated working voltage is applied to the two ends of the coil of the tripping relay 11TJF, the normally-opened contact is immediately closed, and the three-phase circuit breaker is tripped.
As shown in fig. 4 and fig. 5, in the second embodiment of the present invention, another three-phase inconsistent protection secondary circuit structure of a high-voltage circuit breaker body provided by the inventor includes two protection branch structures B1 and B2 connected in parallel, where each of the two protection branch structures B1 and B2 includes a three-phase inconsistent starting circuit S1 and S2 of the high-voltage circuit breaker disposed in a circuit breaker control box, a time relay SJ1 and SJ2 disposed in a relay protection room protection screen, and a trip relay 11TJF and 21TJF disposed in a trip relay circuit loop in a relay protection screen circuit breaker operation box of the relay protection room; wherein the content of the first and second substances,
in each protection branch structure, the input end of a three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected with the positive electricity of a corresponding preset control power supply, one output end of the high-voltage inconsistent starting circuit is connected with the positive electricity end of a coil of a corresponding time relay, and the other output end of the high-voltage inconsistent starting circuit is connected with one end of a normally open time contact of the corresponding time relay;
for example, the input end of a three-phase inconsistent starting loop S1 of the high-voltage circuit breaker in the protection branch structure B1 is connected with positive electricity 101 of a preset control power supply, one output end of the three-phase inconsistent starting loop is connected with a coil positive electricity end A1 of a corresponding time relay SJ1, and the other output end of the three-phase inconsistent starting loop is connected with one end of a normally open time contact (for example, two normally open time contacts which are connected in series are SJ1-5 and SJ1-8 respectively, and SJ1-15 and SJ1-18) of the corresponding time relay SJ 1; of course, the normally open time contact of time relay SJ1 can be one (e.g., SJ1-5 and SJ1-8, or SJ1-15 and SJ 1-18);
the input end of a high-voltage breaker three-phase inconsistent starting loop S2 in a protection branch structure B2 is connected with positive electricity 201 of a preset control power supply, one output end of the high-voltage breaker three-phase inconsistent starting loop is connected with a coil positive electricity end A5 of a corresponding time relay SJ2, and the other output end of the high-voltage breaker three-phase inconsistent starting loop S2 is connected with one end of a normally open time contact (for example, two normally open time contacts which are connected in series are SJ2-5 and SJ2-8 respectively, and SJ2-15 and SJ2-18) of a corresponding time relay SJ 2; of course, the normally open time contact of time relay SJ2 can be one (e.g., SJ2-5 and SJ2-8, or SJ2-15 and SJ 2-18);
in each protection branch structure, the negative end of a coil of a time relay is connected with the negative electricity of a corresponding preset control power supply, and the other end of a normally open time contact is connected with the positive end of the coil of the corresponding trip relay;
for example, the coil negative electric end a2 of the time relay SJ1 in the protection branch structure B1 is connected to the negative electricity 102 of the corresponding preset control power supply, and the other end of the normally open time contact (for example, two serially connected normally open time contacts are SJ1-5 and SJ1-8, and SJ1-15 and SJ1-18, respectively) is connected to the coil positive electric end A3 of the corresponding trip relay 11 TJF;
a coil negative electric end A6 of a time relay SJ2 in the protection branch structure B2 is connected with a negative electricity 202 of a corresponding preset control power supply, and the other end of a normally open time contact (for example, two serially connected normally open time contacts are SJ2-5, SJ2-8, SJ2-15 and SJ2-18 respectively) is connected with a coil positive electric end A7 of a corresponding trip relay 21 TJF;
in each protection branch structure, the negative electricity end of a coil of a tripping relay is connected with the negative electricity of a corresponding preset control power supply, and normally open contacts are connected with a high-voltage circuit breaker in a circuit breaker control box to form a loop;
for example, the coil negative electric end a4 of the trip relay 11TJF in the protection branch structure B1 is connected to the negative electricity 102 of the corresponding preset control power source, and the normally open contact is connected to the high-voltage circuit breaker in the circuit breaker control box to form a loop (not shown);
a coil negative electric end A8 of a tripping relay 21TJF in the protection branch structure B2 is connected with a negative electricity 202 of a corresponding preset control power supply, and a normally open contact is connected with a high-voltage circuit breaker in a circuit breaker control box to form a loop (not shown);
when the three-phase opening and closing states of the high-voltage circuit breakers are asynchronous, each three-phase inconsistent starting loop S1 and S2 of each high-voltage circuit breaker is automatically connected, each time relay SJ1 and SJ2 is electrified and started in a delayed mode, and the normally open time contacts (such as two serially connected normally open time contacts SJ1-5 and SJ1-8, SJ1-15 and SJ1-18, and two serially connected normally open time contacts SJ2-5 and SJ2-8, SJ2-15 and SJ2-18) of each time relay SJ1 and SJ2 are closed to drive the normally open contacts of the corresponding tripping relays 11TJF and 21TJF to be closed, so that the three-phase of the high-voltage circuit breakers are tripped.
It will be appreciated that in fig. 5, there are three trip relays for TJF on each trip relay loop, and the three trip relays are connected in series to form a three-trip relay. For example, there are three tripping relays (e.g. 11TJF, 12TJF and 13TJF) for the TJF on one tripping relay loop, three tripping relays (e.g. 21TJF, 22TJF and 23TJF) for the TJF on the other tripping relay loop, and the three tripping relays (e.g. 11TJF, 12TJF and 13TJF) are connected in series to form a three-tripping relay, and the three tripping relays (e.g. 21TJF, 22TJF and 23TJF) are connected in series to form a three-tripping relay. At this time, as shown in fig. 5, the 4Q1D23 terminal is directly connected to the normally open time contact of time relay SJ1, and the 4Q2D17 terminal is directly connected to the normally open time contact of time relay SJ 2.
It can be understood that the high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure in the second embodiment of the invention follows a dualization design principle, the excitation coils of the two time relays SJ1 and SJ2 are respectively connected to the two groups of high-voltage circuit breaker three-phase inconsistent starting circuits S1 and S2, and the two groups of normally open time contacts of each time relay SJ1 and SJ2 are connected in series and then respectively connected to the trip relays 11TJF and 21TJF on the two trip relay circuits in the relay protection screen circuit breaker operating box, so that protection malfunction caused by the abnormality of a single relay contact and protection malfunction caused by one group of control power supply malfunction can be effectively prevented.
The working principle of the high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure in the second embodiment of the invention is that when the high-voltage circuit breaker is in a three-phase closing state, three-phase normally-closed auxiliary contacts DLA-DLC on three-phase inconsistent starting circuits S1 and S2 of the high-voltage circuit breaker are disconnected; when the high-voltage circuit breaker is in a three-phase opening state, three-phase normally-open auxiliary contacts DLa-DLc on three-phase inconsistent starting loops S1 and S2 of the high-voltage circuit breaker are disconnected. Under the two normal conditions, the three-phase inconsistent starting circuits S1 and S2 of the high-voltage circuit breaker are normally disconnected, and the coils of the time relays SJ1 and SJ2 are powered off, so that the time delay function is not started.
However, when three-phase inconsistent starting circuits S1 and S2 of the high-voltage circuit breaker are switched on, positive control power supplies 101 and 201 are respectively led to an end A1 of a time relay SJ1 and an end A5 of a time relay SJ2, rated working voltages are applied to two ends of coils of the time relay SJ1 and the time relay SJ2 at the moment, a time delay function is started, after time exceeds a setting value, normally open delay contacts SJ1-5 and SJ1-8 of the time relay SJ1, SJ1-15 and SJ1-18 and normally open delay contacts SJ2-5 and SJ2-8 of the time relay SJ2 are closed and conducted, SJ2-15 and SJ2-18 are closed and switched on, the positive control power supplies 101 and 201 are respectively led to a positive tripping relay terminal A3 and a tripping relay TJF 21A 7 on a tripping relay TJF relay circuit TJF in a relay protection screen circuit breaker operating box, and the tripping relay protection screen circuit is immediately led to two ends of the relay protection screen circuit breaker, and the rated working relays JF is immediately applied to two ends of a JF and, its normally open contact closes immediately, tripping the breaker three-phase.
The embodiment of the invention has the following beneficial effects:
1. the invention breaks through the traditional design that components such as a delay relay for three-phase inconsistent protection of a high-voltage circuit breaker body, an outlet tripping intermediate relay and the like which are operated in a split-phase mode for a long time are installed in a local control cubicle, and the components are installed in a relay protection screen, so that the advantages of controllable temperature and humidity, small mechanical vibration, weak electromagnetic interference and the like in the relay protection cubicle are fully utilized, the operating environment of the components such as the delay relay for three-phase inconsistent protection of the body is effectively improved, and the operating reliability of the components is improved;
2. the invention provides an outlet tripping intermediate relay for canceling the three-phase inconsistent protection of a high-voltage circuit breaker body for the first time, and a normally open contact of a time delay relay is directly connected to a tripping relay on a tripping relay loop (not starting failure and not starting reclosing) in an operation box of a relay protection screen circuit breaker, so that the design of the three-phase tripping function of the high-voltage circuit breaker is realized, a secondary loop is simplified, and the reliability of protection action is improved;
3. in order to improve the reliability of protection action, the invention follows a dual design principle, two time relay excitation coils are respectively connected into two groups of high-voltage circuit breaker three-phase inconsistent starting loops, two groups of normally open time contacts of each time relay are connected in series and then are respectively connected into the tripping relays on two tripping relay loops in a relay protection screen circuit breaker operation box, and the invention can effectively prevent protection misoperation caused by the abnormity of a single relay contact and protection failure operation caused by the fault of one group of control power supplies.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. A high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure is characterized by comprising a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay arranged on a tripping relay circuit in a relay protection screen circuit breaker operation box in advance; wherein the content of the first and second substances,
the input end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with the positive electricity of a preset control power supply, one output end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with the coil positive electricity end of the time relay, and the other output end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with one end of a normally open time contact of the time relay;
the negative end of a coil of the time relay is connected with the negative electricity of a preset control power supply, and the other end of a normally open time contact of the time relay is connected with the positive end of the coil of the tripping relay;
the negative electricity end of a coil of the tripping relay is connected with the negative electricity of the preset control power supply, and a normally open contact of the tripping relay is connected with a high-voltage circuit breaker in the circuit breaker control box to form a loop;
when the three-phase opening and closing states of the high-voltage circuit breaker are asynchronous, the three-phase inconsistent starting circuit of the high-voltage circuit breaker is automatically switched on, so that the time relay is electrified and started in a delayed mode, the normally open time contact of the time relay is closed to drive the normally open contact of the tripping relay to be closed, and the three-phase tripping of the high-voltage circuit breaker is realized.
2. The high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure as claimed in claim 1, wherein there are two normally open time contacts of the time relay, and the two normally open time contacts of the time relay are connected in series.
3. The high voltage circuit breaker body three-phase inconsistent protection secondary circuit structure of claim 1, wherein there are three trip relays on the trip relay circuit, and the three trip relays are connected together in series.
4. A high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure is characterized by comprising two protection branch structures which are connected in parallel, wherein each protection branch structure comprises a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay which is preset on a tripping relay circuit in a relay protection screen circuit breaker operation box; wherein the content of the first and second substances,
in each protection branch structure, the input end of a three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected with the positive electricity of a corresponding preset control power supply, one output end of the high-voltage inconsistent starting circuit is connected with the positive electricity end of a coil of a corresponding time relay, and the other output end of the high-voltage inconsistent starting circuit is connected with one end of a normally open time contact of the corresponding time relay;
in each protection branch structure, the negative end of a coil of a time relay is connected with the negative electricity of a corresponding preset control power supply, and the other end of a normally open time contact is connected with the positive end of the coil of the corresponding trip relay;
in each protection branch structure, the negative electricity end of a coil of a tripping relay is connected with the negative electricity of a corresponding preset control power supply, and normally open contacts are connected with a high-voltage circuit breaker in a circuit breaker control box to form a loop;
when the three-phase opening and closing states of the high-voltage circuit breakers are asynchronous, each three-phase inconsistent starting circuit of each high-voltage circuit breaker is automatically switched on, each time relay is enabled to be powered on and started in a delayed mode, the normally open time contact of each time relay is enabled to be closed to drive the normally open contact of the corresponding tripping relay to be closed, and three-phase tripping of the high-voltage circuit breakers is achieved.
5. The three-phase inconsistent protection secondary circuit structure of high-voltage circuit breaker body as claimed in claim 4, wherein there are two normally open time contacts of each time relay, and the two normally open time contacts of each time relay are correspondingly connected in series.
6. The high voltage circuit breaker body three phase inconsistent protection secondary circuit structure of claim 4 wherein there are three trip relays on each trip relay loop and three trip relays on each trip relay loop are connected together in series.
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| CN201911277430.7A CN110880742A (en) | 2019-12-13 | 2019-12-13 | High-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure |
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| CN201911277430.7A CN110880742A (en) | 2019-12-13 | 2019-12-13 | High-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure |
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