CN108899236B - Circuit for preventing repeated switching on and switching off, energy storage motor, spring energy storage mechanism and circuit breaker - Google Patents
Circuit for preventing repeated switching on and switching off, energy storage motor, spring energy storage mechanism and circuit breaker Download PDFInfo
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- CN108899236B CN108899236B CN201810783135.8A CN201810783135A CN108899236B CN 108899236 B CN108899236 B CN 108899236B CN 201810783135 A CN201810783135 A CN 201810783135A CN 108899236 B CN108899236 B CN 108899236B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The application provides a prevent to divide closing circuit, energy storage motor, spring energy storage mechanism and circuit breaker repeatedly for solve the problem of circuit breaker spring energy storage mechanism because of the ageing repeated divide-shut brake of machinery among the prior art. Prevent to divide closing circuit repeatedly includes: a sensor, a signal processor and a relay; the sensor is electrically connected with the signal processor, and the signal processor is electrically connected with the relay; the sensor is used for detecting the current change of the electric loop and sending an energy storage signal to the signal processor; the signal processor is used for accumulating the energy storage times according to the signals sent by the receiving sensor and the signals sent by the sensor, and sending a disconnection signal to the relay when the energy storage times in a counting period exceed a preset time, wherein the counting period is the sum of the actual energy storage time average value and a first preset time period; the relay is used for disconnecting the connection between the electric circuit and the power supply according to the disconnection signal sent by the signal processor so as to prevent repeated opening and closing.
Description
Technical Field
The application relates to the technical field of circuit breakers and spring energy storage operating mechanisms, in particular to a circuit for preventing repeated opening and closing, an energy storage motor, a spring energy storage mechanism and a circuit breaker.
Background
At present, a large number of circuit breakers in substations in the industry adopt spring energy storage operating mechanisms, when the spring energy storage operating mechanisms work normally, springs release energy after the circuit breakers are closed, energy storage spring travel switches in motor circuits are closed, the motor circuits are switched on, the motors start to rotate, the energy storage spring travel switches are switched off after the springs store energy, and motors stop rotating. When the operating time of the spring energy storage operating mechanism is long, part of components are deformed mechanically or elements are damaged, and other faults caused by mechanical aging can occur. Mechanical aging of components that cause repeated opening and closing of the brake, for example: a closing control balance spring and a worn closing half shaft. Specifically, the deformation of the reset spring of the closing half shaft can cause the energy storage mechanism to be incapable of self-holding after the spring is stored in place, so that the automatic energy release is performed for closing, and the spring starts to store energy after the energy release. If a permanent fault occurs on the circuit at this time, the breaker should be accelerated to trip and isolate the fault after tripping and reclosing on the fault. After reclosing, the spring automatically releases energy when the stored energy is in place, so that the breaker is closed again at the fault, the breaker enters a dead cycle of tripping and closing, and the fault of repeated opening and closing of the breaker is caused. The fault that the circuit breaker divides closing repeatedly can cause very big impact to primary equipment, can lead to the circuit breaker serious damage even. Therefore, the problem that the spring energy storage mechanism of the circuit breaker is repeatedly switched on and off due to mechanical aging exists in the prior art.
Disclosure of Invention
In view of this, the application provides a circuit for preventing repeated switching on and switching off, an energy storage motor, a spring energy storage mechanism and a circuit breaker, which are used for solving the problem that the spring energy storage mechanism of the circuit breaker in the prior art is repeatedly switched on and switched off due to mechanical aging.
In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:
the application provides a pair of prevent to divide-shut brake circuit repeatedly includes: a sensor, a signal processor and a relay; the sensor is electrically connected with the signal processor, and the signal processor is electrically connected with the relay; the sensor is used for detecting the current change of an electric loop and sending a stored energy signal to the signal processor, wherein the stored energy signal is sent when the sensor detects that the current of the electric loop is increased from zero to working current; the signal processor is used for accumulating the energy storage times according to the received signals sent by the sensor and the signals sent by the sensor, and sending a disconnection signal to the relay when the energy storage times in a counting period exceed a preset time, wherein the counting period is the sum of the actual energy storage time average value and a first preset time period; the relay is used for disconnecting the connection between the electric loop and the power supply according to the disconnection signal sent by the signal processor so as to prevent repeated switching on and switching off.
Optionally, in this embodiment of the present application, the circuit for preventing repeated switching on and off further includes a counter, and the counter is connected to the signal processor; the signal processor is configured to: accumulating the energy storage times according to the signals sent by the sensors, and specifically comprising the following steps: sending an accumulation signal to the counter according to the signal sent by the sensor; and the counter is used for accumulating the energy storage times according to the accumulation signal.
Optionally, in this embodiment of the present application, the circuit for preventing repeated switching on and off further includes a timer; the timer is electrically connected with the counter; the timer is used for calculating a counting period, and the counting period is the sum of the actual energy storage time average value and a first preset time period.
Optionally, in this embodiment of the present application, the circuit for preventing repeated switching on and off further includes an alarm device; the alarm device is connected with a signal transmitting contact of the relay; the alarm device is used for receiving the alarm signal sent by the relay and sending an alarm notice.
Optionally, in an embodiment of the present application, the sensor includes a hall element; the Hall element is used for detecting the current change of the electric loop.
Optionally, in an embodiment of the present application, the sensor includes a fiber-optic type current transformer; the optical fiber type current transformer is used for detecting current change of an electric loop.
The present application further provides an energy storage motor, comprising: the energy storage power supply, the first power supply air switch, the second power supply air switch, the electric circuit and the circuit for preventing repeated switching on and switching off are arranged; the circuit for preventing repeated switching on and switching off further comprises a connecting end; the connection end includes: a first input terminal, a first output terminal, a second input terminal and a second output terminal; the first input end is electrically connected with the first output end, and the second input end is electrically connected with the second output end; one end of the first power supply air switch is connected with the negative electrode of the energy storage power supply, and the other end of the first power supply air switch, which is far away from the negative electrode of the energy storage power supply, is connected with the first input end of the repeated opening and closing prevention circuit; one end of the second power supply air switch is connected with the anode of the energy storage power supply, and the other end of the second power supply air switch, which is far away from the anode of the energy storage power supply, is connected with the second output end of the repeated switching-on and switching-off prevention circuit; one end of the electric loop is connected with the first output end of the circuit for preventing repeated switching on and switching off, and the other end of the electric loop, which is far away from the first output end of the circuit for preventing repeated switching on and switching off, is connected with the second input end of the circuit for preventing repeated switching on and switching off.
Optionally, in an embodiment of the present application, the electrical circuit includes: a first serial circuit element group and a second serial circuit element group; the first serial circuit element group is connected in parallel with the second serial circuit element group; the first group of serial circuit elements includes: the energy storage device comprises an energy storage motor, a first energy storage spring travel switch and an energy storage switch; the energy storage motor, the first energy storage spring travel switch and the energy storage switch are sequentially connected in series; the second serial circuit element group includes: the energy storage indicator lamp and the second energy storage spring travel switch; the energy storage indicator lamp and the second energy storage spring travel switch are sequentially connected in series.
The application also provides a spring energy storage mechanism, spring energy storage mechanism includes spring energy storage mechanism body, spring energy storage mechanism body includes: springs and stored energy motors as described above; the spring is elastically connected with the energy storage motor.
The application also provides a circuit breaker, the circuit breaker includes the circuit breaker body, the circuit breaker body includes as above spring energy storage mechanism.
The application provides a pair of prevent to relapse divide-shut brake circuit, energy storage motor, spring energy storage mechanism and circuit breaker, through the current change that detects electric circuit, the electric current from zero when increasing to operating current remembers to increase once for the energy storage number of times to judge in the count cycle whether the energy storage number of times surpasses preset number of times, gives the relay with break signal transmission when surpassing, and the relay just breaks off when receiving the break signal that signal processor sent electric circuit and power are connected. Therefore, the problem that the spring energy storage mechanism of the circuit breaker is repeatedly switched on and off due to mechanical aging in the prior art is effectively solved.
In order to make the aforementioned and other objects and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
For a clearer explanation of the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a first view structural diagram of a circuit for preventing repeated switching on and switching off in an embodiment of the present application;
fig. 2 shows a second view structural diagram of the circuit for preventing repeated switching on and off in the embodiment of the present application;
fig. 3 shows a first view structural diagram of an energy storage motor in an embodiment of the present application;
fig. 4 shows a first view structural diagram of an electrical circuit in an embodiment of the present application;
FIG. 5 shows a schematic structural diagram of a spring energy storage mechanism in an embodiment of the present application;
fig. 6 shows a schematic structural diagram of a circuit breaker in an embodiment of the present application.
Icon: 101-an energy storage motor; 102-a spring energy storage mechanism; 103-a circuit breaker; 104-a spring; 100-a circuit for preventing repeated switching on and switching off; 110-a sensor; 130-a timer; 150-a relay; 170-a signal processor; 190-a counter; 120-an alarm device; 140-a connection end; 141-a first input; 143-a first output; 145-second input terminal; 147-a second output; 300-an energy storage power supply; 310-negative electrode; 330-positive pole; 500-first power air switch; 700-a second power air switch; 900 — an electrical loop; 910-a first group of serial circuit elements; 911-energy storage motor; 913-a first stored energy spring travel switch; 915-energy storage switch; 930-a second group of serial circuit elements; 931-energy storage indicator light; 933-second stored energy spring travel switch.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
Referring to fig. 1, fig. 1 is a schematic view illustrating a first view angle of a circuit for preventing repeated opening and closing in an embodiment of the present application. The application provides a prevent to divide closing circuit 100 repeatedly includes: sensor 110, relay 150, and signal processor 170; the sensor 110 is electrically connected with the signal processor 170, and the signal processor 170 is electrically connected with the relay 150;
the sensor 110 is used for detecting the current change of the electrical circuit 900 and sending a stored energy signal to the signal processor 170, wherein the stored energy signal is sent when the sensor 110 detects that the current of the electrical circuit 900 is increased from zero to the working current;
the signal processor 170 is configured to accumulate the energy storage times according to the signal sent by the receiving sensor 110 and according to the signal sent by the sensor 110, and send a turn-off signal to the relay 150 when the energy storage times in a counting period exceed a preset time, where the counting period is the sum of the actual energy storage time average value and a first preset time period;
the relay 150 is used to disconnect the electric circuit 900 from the power supply in accordance with an off signal sent from the signal processor 170, thereby preventing repeated opening and closing.
The method includes: sensor 110, signal processor 170, and relay 150; the sensor 110 is electrically connected with the signal processor 170, and the signal processor 170 is electrically connected with the relay 150; the sensor 110 is used for detecting the current change of the electrical circuit 900 and sending a stored energy signal to the signal processor 170, wherein the stored energy signal is sent when the sensor 110 detects that the current of the electrical circuit 900 is increased from zero to the working current; the signal processor 170 is configured to accumulate the energy storage times according to the signal sent by the receiving sensor 110 and according to the signal sent by the sensor 110, and send a turn-off signal to the relay 150 when the energy storage times in a counting period exceed a preset time, where the counting period is the sum of the actual energy storage time average value and a first preset time period; the relay 150 is used to disconnect the electric circuit 900 from the power supply in accordance with an off signal sent from the signal processor 170, thereby preventing repeated opening and closing.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a second view angle of the circuit for preventing repeated opening and closing in the embodiment of the present application. Optionally, in the embodiment of the present application, the circuit 100 for preventing repeated switching on and off further includes a counter 190, and the counter 190 is connected to the signal processor 170;
the signal processor 170 is configured to: accumulating the energy storage times according to the signals sent by the sensor 110, specifically: sending an accumulation signal to the counter 190 according to the signal sent by the sensor 110;
the counter 190 is used for accumulating the energy storage times according to the accumulation signal.
The circuit 100 for preventing repeated switching on and off further includes a counter 190, and the counter 190 is connected to the signal processor 170; the signal processor 170 is configured to: accumulating the energy storage times according to the signals sent by the sensor 110, specifically: sending an accumulation signal to the counter 190 according to the signal sent by the sensor 110; the counter 190 is used for accumulating the energy storage times according to the accumulation signal. That is, the counter 190 can replace the counting function of the signal processor 170, which not only reduces the load of the signal processor 170, but also increases the speed of processing signals and data by the signal processor 170, thereby improving the processing efficiency of the signal processor 170.
Referring to fig. 2, optionally, in the embodiment of the present application, the repeated opening and closing prevention circuit 100 further includes a timer 130; the timer 130 is electrically connected with the counter 190; the timer 130 is configured to calculate a counting period, where the counting period is the average value of the actual energy storage time plus a first preset time period.
The circuit 100 for preventing repeated opening and closing further includes a timer 130; the timer 130 is electrically connected with the counter 190; the timer 130 is configured to calculate a counting period, where the counting period is the average value of the actual energy storage time plus a first preset time period. That is, the timer 130 can replace the timing function of the signal processor 170, which not only reduces the load of the signal processor 170, but also increases the speed of processing signals and data by the signal processor 170, and improves the processing efficiency of the signal processor 170.
Referring to fig. 2, optionally, in the embodiment of the present application, the circuit 100 for preventing repeated opening and closing further includes an alarm device 120; the alarm device 120 is connected with a signaling contact of the relay 150; the alarm device 120 is used for receiving the alarm signal sent by the relay 150 and sending an alarm notification.
The circuit 100 for preventing repeated switching on and off further includes an alarm device 120; the alarm device 120 is connected with a signaling contact of the relay 150; the alarm device 120 is used for receiving the alarm signal sent by the relay 150 and sending an alarm notification. The alarm device 120 sends out an alarm notification to notify people to overhaul the related equipment, and the related equipment is restored to the working state after the overhaul is finished, so that the equipment failure time is shortened, the safety of the equipment is ensured, and the equipment is prevented from being damaged by strong current caused by repeated switching-on.
Optionally, in the present embodiment, the sensor 110 includes a hall element; the hall element is used to detect a change in current of the electrical circuit 900.
The sensor 110 includes a hall element; the hall element is used to detect a change in current of the electrical circuit 900. The use of a hall element as the sensor 110 to detect the loop current change state increases the sensitivity and effectiveness of the sensor 110.
Optionally, in the present embodiment, the sensor 110 includes a fiber-optic type current transformer; the fiber-optic type current transformer is used to detect a current change of the electrical circuit 900.
The sensor 110 includes an optical fiber type current transformer; the fiber-optic type current transformer is used to detect a current change of the electrical circuit 900. The use of the optical fiber type current transformer as the sensor 110 for detecting the loop current change state increases the sensitivity and the degree of effectiveness of the sensor 110.
Second embodiment
Referring to fig. 3, fig. 3 is a schematic view illustrating a first perspective structure of an energy storage motor according to an embodiment of the present application. The present application also provides a storage motor 101, the storage motor 101 including: the energy storage power supply 300, the first power supply air switch 500, the second power supply air switch 700, the electric circuit 900 and the circuit 100 for preventing repeated switching on and off as above; the circuit 100 for preventing repeated switching on and off further comprises a connecting end 140; the connection end 140 includes: a first input 141, a first output 143, a second input 145, and a second output 147; the first input 141 is electrically connected to the first output 143, and the second input 145 is electrically connected to the second output 147;
one end of the first power supply air switch 500 is connected with the negative electrode 310 of the energy storage power supply 300, and the other end of the first power supply air switch 500, which is far away from the negative electrode 310 of the energy storage power supply 300, is connected with the first input end 141 of the repeated switching-on/off prevention circuit 100; one end of the second power supply air switch 700 is connected with the anode 330 of the energy storage power supply 300, and the other end of the second power supply air switch 700, which is far away from the anode 330 of the energy storage power supply 300, is connected with the second output end 147 of the repeated opening and closing prevention circuit 100; one end of the electric circuit 900 is connected to the first output terminal 143 of the repetitive prevention switching circuit 100, and the other end of the electric circuit 900, which is away from the first output terminal 143 of the repetitive prevention switching circuit 100, is connected to the second input terminal 145 of the repetitive prevention switching circuit 100.
It should be noted that, the present application also provides an energy storage motor 101, where the energy storage motor 101 includes: the energy storage power supply 300, the first power supply air switch 500, the second power supply air switch 700, the electric circuit 900 and the circuit 100 for preventing repeated switching on and off as above; the circuit 100 for preventing repeated switching on and off further comprises a connecting end 140; the connection end 140 includes: a first input 141, a first output 143, a second input 145, and a second output 147; the first input 141 is electrically connected to the first output 143, and the second input 145 is electrically connected to the second output 147; one end of the first power supply air switch 500 is connected with the negative electrode 310 of the energy storage power supply 300, and the other end of the first power supply air switch 500, which is far away from the negative electrode 310 of the energy storage power supply 300, is connected with the first input end 141 of the repeated switching-on/off prevention circuit 100; one end of the second power supply air switch 700 is connected with the anode 330 of the energy storage power supply 300, and the other end of the second power supply air switch 700, which is far away from the anode 330 of the energy storage power supply 300, is connected with the second output end 147 of the repeated opening and closing prevention circuit 100; one end of the electric circuit 900 is connected to the first output terminal 143 of the repetitive prevention switching circuit 100, and the other end of the electric circuit 900, which is away from the first output terminal 143 of the repetitive prevention switching circuit 100, is connected to the second input terminal 145 of the repetitive prevention switching circuit 100. Under the condition of repeated closing of the energy storage motor 101, the circuit 100 for preventing repeated opening and closing can effectively ensure the safety of equipment and ensure that the equipment is not damaged by strong current caused by repeated closing.
Referring to fig. 4, fig. 4 is a schematic view illustrating a first perspective structure of an electrical circuit in an embodiment of the present application. Optionally, in this embodiment of the present application, the electrical circuit 900 includes: a first serial circuit element group 910 and a second serial circuit element group 930; the first serial circuit element group 910 is connected in parallel with the second serial circuit element group 930;
first serial circuit element group 910 includes: an energy storage motor 911, a first energy storage spring travel switch 913 and an energy storage switch 915; the energy storage motor 911, the first energy storage spring travel switch 913 and the energy storage switch 915 are sequentially connected in series;
the second serial circuit element group 930 includes: an energy storage indicator lamp 931 and a second energy storage spring travel switch 933; the energy storage indicator lamp 931 and the second energy storage spring stroke switch 933 are connected in series in this order.
Here, the electrical circuit 900 includes: a first serial circuit element group 910 and a second serial circuit element group 930; the first serial circuit element group 910 is connected in parallel with the second serial circuit element group 930; first serial circuit element group 910 includes: an energy storage motor 911, a first energy storage spring travel switch 913 and an energy storage switch 915; the energy storage motor 911, the first energy storage spring travel switch 913 and the energy storage switch 915 are sequentially connected in series; the second serial circuit element group 930 includes: an energy storage indicator lamp 931 and a second energy storage spring travel switch 933; the energy storage indicator lamp 931 and the second energy storage spring stroke switch 933 are connected in series in this order.
Third embodiment
Referring to fig. 5, fig. 5 shows a schematic structural diagram of a spring energy storage mechanism in an embodiment of the present application. The application further provides a spring energy storage mechanism 102, and the spring energy storage mechanism 102 includes a spring energy storage mechanism body, and the spring energy storage mechanism body includes: spring 104 and storage motor 101 as above; the spring is elastically connected to the storage motor 101.
It should be noted that the spring energy storage mechanism 102 includes a spring energy storage mechanism body, and the spring energy storage mechanism body includes: spring 104 and storage motor 101 as above; the spring 104 is elastically connected to the storage motor 101. Under the condition of repeated closing of the spring energy storage mechanism 102, the circuit 100 for preventing repeated opening and closing can effectively ensure the safety of the equipment and ensure that the equipment is not damaged by strong current caused by repeated closing.
Fourth embodiment
Referring to fig. 6, fig. 6 shows a schematic structural diagram of a circuit breaker in an embodiment of the present application. The application also provides a circuit breaker 103, and the circuit breaker 103 comprises a circuit breaker body, and the circuit breaker body comprises the spring energy storage mechanism 102.
The circuit breaker 103 includes a circuit breaker body, and the circuit breaker body includes the spring energy storage mechanism 102. Under the condition of repeated closing of the circuit breaker 103, the circuit 100 for preventing repeated opening and closing can effectively ensure the safety of equipment and ensure that the equipment is not damaged by strong current caused by repeated closing.
For convenience of understanding, another implementation provided in the examples of the present application is described below, and the details of the another implementation provided in the examples of the present application are as follows:
at present, a large number of circuit breakers in a transformer substation adopt a spring energy storage operating mechanism which comprises an energy storage motor, a spring, an auxiliary switch, a ratchet wheel, a switching-off coil, a switching-on coil, a switching-off control half shaft, a switching-on control half shaft and other elements. The electrical loop of the energy storage motor is extensive and simple.
The energy storage device is composed of an energy storage power supply, an energy storage power supply air switch, an energy storage motor travel switch, an energy storage motor and an energy storage indicator lamp. The energy storage loop takes an energy storage power supply air switch as a protection element, and can only play a role in protection when the motor is blocked or the winding is short-circuited to cause overcurrent.
Under the normal operating condition, the spring releases energy after the circuit breaker closes, and travel switch in the motor circuit is closed, and the motor circuit is put through, and the motor begins to rotate, for the spring energy storage, after the spring energy storage target in place, travel switch disconnection, motor stall. When the operating time of the spring energy storage operating mechanism is long, part of components are deformed mechanically or elements are damaged, and other faults caused by mechanical aging can occur. For example, the deformation of the return spring of the closing half shaft can cause the spring to automatically release energy when the energy is stored in place, and the spring starts to store energy again. If a permanent fault occurs on the circuit at this time, the breaker should be accelerated to trip and isolate the fault after tripping and reclosing on the fault. After reclosing, the spring automatically releases energy when the energy is stored in place, so that the breaker is closed again at the fault, and the breaker enters a dead cycle of tripping and closing. The circuit breaker is repeatedly switched on, and the fault can cause great impact on primary equipment, and even can cause switch explosion. Such faults have occurred during grid operation.
The anti-tripping function in the circuit breaker control circuit can only prevent the switch jumping phenomenon caused when the opening and closing circuits are simultaneously conducted. For the switch jump caused by aging and deformation of the mechanism, the anti-jump loop of the protection device and the operation mechanism cannot play a role in protection. At present, the problem of the spring operating mechanism of the circuit breaker cannot be solved in the manufacturing process. In the actual operation of the power grid, only the reclosing function of the synchronous production equipment can be completely quitted aiming at the situation, so that the power supply reliability of the relevant area is greatly reduced.
The application provides a method for preventing a spring energy storage mechanism of a circuit breaker from repeatedly opening and closing due to mechanical aging. The method is mainly characterized in that whether the operating mechanism of the circuit breaker has the behavior of repeatedly storing energy for many times in a short time is judged through the current of the motor loop. If the operating mechanism of the circuit breaker repeatedly stores energy for a plurality of times in a short time, the circuit breaker is repeatedly switched on and off, and at the moment, the motor loop is disconnected through the relay contact connected in series in the motor loop, so that the operating mechanism of the circuit breaker is prevented from continuously storing energy, and the effect of preventing the circuit breaker from repeatedly switching on and off is achieved. The method comprises the following steps.
The method comprises the following steps: detecting the current change of the energy storage motor loop;
step two: judging the energy storage times of the circuit breaker operating mechanism;
step three: determining a counting period and recording the energy storage times of the circuit breaker operating mechanism;
step four: if the energy storage times of the circuit breaker operating mechanism in the counting period exceed one time, the energy storage loop is disconnected;
step five: and sending a signal to an alarm device.
Specifically, for ease of understanding, each step is explained and illustrated in detail below, wherein the detailed explanation and illustration is as follows:
in the first step, the motor loop is a direct current loop, and the detection of the direct current can be performed by using a hall element or an optical fiber type current transformer as a sensor. Under normal conditions, after the operating mechanism finishes storing energy, the loop has no current, and only has current in the energy storing process. The detection is focused on detecting the current change of the motor loop rather than the magnitude. The sensor is followed by a signal processing circuit for performing a correlation process in order to detect the change in the current.
Secondly, every time the motor is subjected to energy storage, the motor current will undergo a process of increasing from zero to an operating current and then becoming zero. Therefore, in the second step, the energy storage times of the circuit breaker operating mechanism can be obtained only by detecting the times of increasing the motor current from zero to the working current, namely, the number of rising edges of the motor current.
In the third step, the counting period is determined according to the actual energy storage time of the circuit breaker, the counting period is slightly longer than the actual energy storage time, and 3 to 4 seconds can be added to the actual energy storage time to serve as the counting period. The actual energy storage time of the circuit breaker can be determined by averaging multiple measurements on site.
In the fourth step, the breaker only can store energy once after being switched on in the normal operation process or when experiencing permanent faults, if the energy storage times of the breaker operating mechanism exceeds once in the counting period determined in the third step, the breaker is switched on for at least two times, and at the moment, the energy storage loop is disconnected, so that the effect of preventing the breaker from being switched on and off repeatedly is achieved. The energy storage loop can be disconnected by connecting the normally closed contact of the relay in series in the motor loop, and when the result of the counter exceeds 1, the relay is driven to disconnect the normally closed contact of the relay.
And step five, when the energy storage loop is cut off in the step four, a signal can be sent through a normally open contact of the same relay to give an alarm. That is, the alarm device is connected with the signal transmitting contact of the relay; the alarm device is used for receiving the alarm signal sent by the relay and sending out an alarm.
The method can cut off the energy storage loop when detecting the second energy storage in the timing period, can effectively prevent the problem that the spring energy storage mechanism of the circuit breaker repeatedly opens and closes due to the automatic energy release of the spring caused by mechanical aging, and ensures the safe operation of the equipment. According to the method, only the relay contact needs to be connected in series behind the air switch of the energy storage power supply, other wiring in the switch mechanism does not need to be changed, corresponding contacts can be provided for alarming, and the method is high in practicability and popularization. The method has wide application range, can be applied to any circuit breaker adopting a spring energy storage mechanism, and plays a role in preventing the switch from being repeatedly switched on and off due to mechanical aging. For the circuit breakers which have been operated for years and have the problem of repeated opening and closing of the same batch of products, by using the method provided by the application, the reclosing function does not need to be quitted, the possible power failure time when instantaneous faults occur is reduced, and the power supply reliability of the corresponding area is greatly improved.
The application provides a pair of prevent to relapse divide-shut brake circuit, energy storage motor, spring energy storage mechanism and circuit breaker, through the current change that detects electric circuit, the electric current from zero when increasing to operating current remembers to increase once for the energy storage number of times to judge in the count cycle whether the energy storage number of times surpasses preset number of times, gives the relay with break signal transmission when surpassing, and the relay just breaks off when receiving the break signal that signal processor sent electric circuit and power are connected. Therefore, the problem that the spring energy storage mechanism of the circuit breaker is repeatedly switched on and off due to mechanical aging in the prior art is effectively solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A circuit for preventing repeated switching on and off, comprising: a sensor, a signal processor and a relay; the sensor is electrically connected with the signal processor, and the signal processor is electrically connected with the relay;
the sensor is used for detecting the current change of an electric loop and sending a stored energy signal to the signal processor, wherein the stored energy signal is sent when the sensor detects that the current of the electric loop is increased from zero to working current;
the signal processor is used for accumulating the energy storage times according to the received signals sent by the sensor and the signals sent by the sensor, and sending a disconnection signal to the relay when the energy storage times exceed a preset time in a counting period, wherein the counting period is the sum of the actual energy storage time average value and a first preset time period;
the relay is used for disconnecting the connection between the electric loop and a power supply according to a disconnection signal sent by the signal processor so as to prevent the switch from being repeatedly switched on and off due to mechanical aging;
the circuit for preventing repeated switching on and switching off further comprises a counter, and the counter is connected with the signal processor; the signal processor is configured to: accumulating the energy storage times according to the signals sent by the sensors, and specifically comprising the following steps: sending an accumulation signal to the counter according to the signal sent by the sensor; the counter is used for accumulating the energy storage times according to the accumulation signal; the circuit for preventing repeated switching on and off further comprises a timer; the timer is electrically connected with the counter; the timer is used for calculating a counting period, and the counting period is the sum of the actual energy storage time average value and a first preset time period; the circuit for preventing repeated switching on and switching off also comprises an alarm device; the alarm device is connected with a signal transmitting contact of the relay; the alarm device is used for receiving the alarm signal sent by the relay and sending an alarm notice.
2. The repeated closing and opening prevention circuit according to claim 1, wherein said sensor comprises a hall element; the Hall element is used for detecting the current change of the electric loop.
3. The repeated closing and opening prevention circuit according to claim 1, wherein said sensor comprises an optical fiber type current transformer; the optical fiber type current transformer is used for detecting current change of an electric loop.
4. An energy storage motor, comprising: the energy storage power supply, the first power supply air switch, the second power supply air switch, the electric circuit and the circuit for preventing repeated switching on and off as claimed in any one of claims 1 to 3; the circuit for preventing repeated switching on and switching off further comprises a connecting end; the connection end includes: a first input terminal, a first output terminal, a second input terminal and a second output terminal; the first input end is electrically connected with the first output end, and the second input end is electrically connected with the second output end;
one end of the first power supply air switch is connected with the negative electrode of the energy storage power supply, and the other end of the first power supply air switch, which is far away from the negative electrode of the energy storage power supply, is connected with the first input end of the repeated opening and closing prevention circuit; one end of the second power supply air switch is connected with the anode of the energy storage power supply, and the other end of the second power supply air switch, which is far away from the anode of the energy storage power supply, is connected with the second output end of the repeated switching-on and switching-off prevention circuit; one end of the electric loop is connected with the first output end of the circuit for preventing repeated switching on and switching off, and the other end of the electric loop, which is far away from the first output end of the circuit for preventing repeated switching on and switching off, is connected with the second input end of the circuit for preventing repeated switching on and switching off.
5. The energy storing motor of claim 4, wherein the electrical circuit comprises: a first serial circuit element group and a second serial circuit element group; the first serial circuit element group is connected in parallel with the second serial circuit element group;
the first group of serial circuit elements includes: the energy storage device comprises an energy storage motor, a first energy storage spring travel switch and an energy storage switch; the energy storage motor, the first energy storage spring travel switch and the energy storage switch are sequentially connected in series;
the second serial circuit element group includes: the energy storage indicator lamp and the second energy storage spring travel switch; the energy storage indicator lamp and the second energy storage spring travel switch are sequentially connected in series.
6. The utility model provides a spring energy storage mechanism which characterized in that, spring energy storage mechanism includes the spring energy storage mechanism body, the spring energy storage mechanism body includes: a spring and an energy storing motor according to any one of claims 4-5; the spring is elastically connected with the energy storage motor.
7. A circuit breaker comprising a circuit breaker body including the spring stored energy mechanism of claim 6.
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| CN201810783135.8A CN108899236B (en) | 2018-07-17 | 2018-07-17 | Circuit for preventing repeated switching on and switching off, energy storage motor, spring energy storage mechanism and circuit breaker |
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| CN201810783135.8A CN108899236B (en) | 2018-07-17 | 2018-07-17 | Circuit for preventing repeated switching on and switching off, energy storage motor, spring energy storage mechanism and circuit breaker |
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| CN112731128A (en) * | 2020-12-14 | 2021-04-30 | 河南平高电气股份有限公司 | Switching-on and switching-off operation device for multi-type circuit breaker and fault detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2290666A1 (en) * | 2009-08-27 | 2011-03-02 | Siemens Aktiengesellschaft | Auxiliary module with lifespan monitoring for electromagnetic switching devices and accompanying method |
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| CN102955129B (en) * | 2012-11-16 | 2016-09-21 | 四川省电力公司内江电业局 | Stored energy mechanism running state detecting device |
| CN105551842B (en) * | 2015-12-08 | 2018-08-03 | 国网上海市电力公司 | A kind of method and device preventing breaker energy storage motor failure |
| CN107192944A (en) * | 2017-06-27 | 2017-09-22 | 广东电网有限责任公司佛山供电局 | A kind of circuit breakers monitoring device with relay protection |
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| EP2290666A1 (en) * | 2009-08-27 | 2011-03-02 | Siemens Aktiengesellschaft | Auxiliary module with lifespan monitoring for electromagnetic switching devices and accompanying method |
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