CN114285169A - Switch control system - Google Patents
Switch control system Download PDFInfo
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- CN114285169A CN114285169A CN202111618978.0A CN202111618978A CN114285169A CN 114285169 A CN114285169 A CN 114285169A CN 202111618978 A CN202111618978 A CN 202111618978A CN 114285169 A CN114285169 A CN 114285169A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The embodiment of the invention discloses a disconnecting link control system, which comprises a disconnecting link and a circuit breaker which are provided with auxiliary switches at intervals, wherein a control loop of the disconnecting link comprises a relay and a mechanism box, a power input end of the mechanism box is connected with a power supply through the relay, an input end of a sampling module is connected with the power supply through the auxiliary switches, a control module comprises an AND gate circuit and a triode, a plurality of input ends of the AND gate circuit are connected with an output end of at least one sampling module, a base electrode of the triode is connected with an output end of the AND gate circuit, a collector electrode of the triode is connected with the power supply, an emitter electrode of the triode is grounded through a coil of the relay, the output end of the sampling module is connected with a plurality of AND gate circuits, the circuit is simplified, in addition, the AND gate circuit outputs high level when the input ends all input high level, outputs low level when any input end inputs low level, the system does not need programming, has low requirement on personnel level, and the logic of the AND gate circuit is stable and reliable, and moreover, the correctness of the locking logic of the control loop can be determined through system wiring.
Description
Technical Field
The embodiment of the invention relates to the technical field of electrical control, in particular to a disconnecting link control system.
Background
In a power distribution network, isolation disconnecting links and grounding disconnecting links are common disconnecting links, each disconnecting link is provided with an auxiliary switch for reflecting the switching value of the disconnecting link, a mechanism box is arranged for controlling the action of the disconnecting link, and the mechanism box unlocks the disconnecting link to operate when power is input.
Generally, whether a mechanism box corresponding to one knife switch has power input is determined by the switching values of other knife switches in an interval, namely, auxiliary switches of other knife switches in the interval related to the operation logic of one knife switch are sequentially connected with the mechanism box of the knife switch in series to form a control loop between the positive pole and the negative pole of a power supply, in order to solve the problems that the wiring of the control loop is complicated and the locking logic is difficult to change when a plurality of knife switches exist, a PLC (programmable logic controller) is adopted in the prior art to simplify the wiring, and the logic control is realized and the locking logic is modifiable through PLC programming, but the following problems still exist when the PLC is adopted:
a) the programming program is unstable, and the probability of misoperation is high;
b) PLC programming has high requirements on the level of maintenance personnel;
c) when the PLC is programmed, the locking logic exists in a chip in a program form, and the correctness of the locking logic is difficult to determine from a wiring in daily maintenance.
Disclosure of Invention
The embodiment of the invention provides a disconnecting link control system, which aims to solve the problems that the probability of incorrect operation caused by unstable programs is high, the requirement of the programming on the level of maintenance personnel is high and the correctness of locking logic cannot be determined from wiring due to the fact that the disconnecting link control is realized by using a PLC (programmable logic controller) to program.
To solve the above problem, an embodiment of the present invention provides a disconnecting link control system, configured to control multiple disconnecting links in an interval on a bus, where the interval includes a disconnecting link and a circuit breaker, where the disconnecting link and the circuit breaker are provided with an auxiliary switch, and the disconnecting link control system includes:
the control loops correspond to the disconnecting switches one by one, each control loop comprises a relay and a mechanism box, and the power supply input end of each mechanism box is connected with a power supply through the relay;
the input end of the sampling module is connected with a power supply through the auxiliary switch so as to output a switching value signal at the output end of the sampling module, wherein the switching value signal is at a low level when the disconnecting link or the circuit breaker is closed and at a high level when the disconnecting link or the circuit breaker is open;
the control modules correspond to the relays one by one and comprise an AND gate circuit and triodes, a plurality of input ends of the AND gate circuit are connected with the output end of at least one sampling module, the base electrode of each triode is connected with the output end of the AND gate circuit, the collector electrode of each triode is connected with the power supply, and the emitter electrode of each triode is grounded through a coil of each relay;
when the input ends of the AND gate circuit input high-level switching value signals, the AND gate circuit outputs high-level signals to drive the triode to be conducted, the relay is powered on and closed, the control circuit is conducted, the mechanism box is powered on and unlocked to control the knife gate, when any input end of the AND gate circuit inputs low-level switching value signals, the AND gate circuit outputs low-level signals to drive the triode to be cut off, the relay is powered off, the control circuit is disconnected, and the mechanism box is powered off and locked to prohibit the knife gate from operating.
Optionally, the sampling module includes a first resistor and a second resistor, one end of the first resistor is connected to the auxiliary switch, the other end of the first resistor is grounded through the second resistor, and a common node of the first resistor and the second resistor is an output end of the sampling module.
Optionally, the sampling module further comprises an indicator light, and the second resistor is grounded through the indicator light.
Optionally, the sampling module further includes a filter capacitor, one end of the filter capacitor is connected to the output end of the sampling module, and the other end of the filter capacitor is grounded.
Optionally, the control circuit further comprises a five-prevention lock, and the power input end of the mechanism box is connected with the relay through the five-prevention lock.
Optionally, the bus includes first bus and second bus, first bus with the second bus passes through the female gang switch and connects, the interval includes the circuit breaker, the one end of circuit breaker respectively through first isolation switch and second isolation switch with first bus with the second bus is connected, the other end loops through third isolation switch and circuit piezo-relay and follow-up circuit connection, the circuit breaker with the public node of first isolation switch and second isolation switch is through first ground connection switch ground connection, the circuit breaker with the public node of third isolation switch is through second ground connection switch ground connection, third isolation switch with the public node of circuit piezo-relay passes through third ground connection switch ground connection.
Optionally, the control loop includes a first control loop, a second control loop, a third control loop, a fourth control loop, a fifth control loop, and a sixth control loop, which are used for controlling the first isolation switch, the second isolation switch, the third isolation switch, the first grounding switch, the second grounding switch, and the third grounding switch, respectively, and the fourth control loop and the fifth control loop share a relay;
the control modules comprise a first control module corresponding to a relay in the first control loop, a second control module corresponding to a relay in the second control loop, a third control module corresponding to a relay in the third control loop, a fourth control module corresponding to relays in the fourth control loop and the fifth control loop, and a fifth control module corresponding to a relay in the sixth control loop.
Optionally, the first control module includes a first and gate circuit and a second and gate circuit, the first and gate circuit includes four input ends, the second and gate circuit includes two input ends, the output ends of the first and gate circuit and the second and gate circuit are both connected to the base of the triode in the first control module, the output end of the sampling module connected to the auxiliary switch of the circuit breaker, the output end of the sampling module connected to the auxiliary switch of the second isolation switch, the output end of the sampling module connected to the auxiliary switch of the first grounding switch, and the output end of the sampling module connected to the auxiliary switch of the second grounding switch are respectively connected to the four input ends of the first and gate circuit, and the output end of the sampling module connected to the auxiliary ground of the bus bar switch and the output end of the sampling module connected to the auxiliary ground of the first isolation switch are respectively connected to the two input ends of the second and gate circuit The input ends are connected.
Optionally, the second control module includes a third and gate circuit and a fourth and gate circuit, the third and gate circuit includes four input ends, the fourth and gate circuit includes two input ends, the output ends of the third and gate circuit and the fourth and gate circuit are both connected to the base of the triode in the second control module, the output end of the sampling module connected to the auxiliary switch of the circuit breaker, the output end of the sampling module connected to the auxiliary switch of the first isolation switch, the output end of the sampling module connected to the auxiliary switch of the first grounding switch, and the output end of the sampling module connected to the auxiliary switch of the second grounding switch are respectively connected to the four input ends of the third and gate circuit, and the output end of the sampling module connected to the auxiliary ground of the bus bar switch and the output end of the sampling module connected to the auxiliary ground of the second isolation switch are respectively connected to the two input ends of the fourth and gate circuit The input ends are connected.
Optionally, the third control module includes a fifth and-gate circuit, the fifth and-gate circuit includes four input ends, an output end of the fifth and-gate circuit is connected to a base of a triode in the third control module, an output end of a sampling module connected to an auxiliary switch of the circuit breaker, an output end of a sampling module connected to an auxiliary switch of the first grounding switch, an output end of a sampling module connected to an auxiliary switch of the second grounding switch, and an output end of a sampling module connected to an auxiliary switch of the third grounding switch are respectively connected to four input ends of the fifth and-gate circuit.
Optionally, the fourth control module includes a sixth and gate circuit, the sixth and gate circuit includes four input ends, an output end of the sixth and gate circuit is connected to a base of a triode in the fourth control module, an output end of a sampling module connected to an auxiliary switch of the circuit breaker, an output end of a sampling module connected to an auxiliary switch of the first isolation switch, an output end of a sampling module connected to an auxiliary switch of the second isolation switch, and an output end of a sampling module connected to an auxiliary switch of the third isolation switch are respectively connected to four input ends of the sixth and gate circuit.
Optionally, the fifth control module includes a seventh and gate circuit, the seventh and gate circuit includes two input ends, an output end of the seventh and gate circuit is connected to a base of a triode in the fifth control module, and an output end of a sampling module connected to an auxiliary switch of the line voltage relay and an output end of a sampling module connected to an auxiliary switch of the third isolation switch are respectively connected to the two input ends of the seventh and gate circuit.
In the knife switch control system of the embodiment of the invention, the knife switches, the circuit breakers and the auxiliary switches connected with the pressure relays in the intervals output switching value signals through the output ends of the corresponding sampling modules, the power input end of the mechanism box in the control loop of each knife switch is connected with a power supply through a relay, the control module corresponding to the relay comprises an AND gate circuit and a triode, a plurality of input ends of the AND gate circuit are connected with the output end of at least one sampling module, the base electrode of the triode is connected with the output end of the AND gate circuit, the collector electrode of the triode is connected with the power supply, and the emitter electrode of the triode is grounded through the coil of the relay, so that the output signals of the sampling modules of other knife switches related to the knife switch control are input into the AND gate circuit of the control module to control the on-off or on-off of the relay in the control loop, on one hand, the output end of each sampling module can be connected to the AND gates of the plurality of the control modules, the circuit is simplified, on the other hand, the AND gate circuit outputs high level when the input ends input high level, and outputs low level when any input end inputs low level, programming is not needed, the requirement on the level of maintenance personnel is low, the logic of the AND gate circuit is stable and reliable, misoperation is avoided, on the other hand, the correctness of the locking logic of each control loop can be determined through a sampling module connected to the input end of the AND gate circuit, and fault troubleshooting is facilitated.
Drawings
Fig. 1 is a schematic diagram of a knife switch control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control loop in an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a sampling module according to a second embodiment of the present invention;
FIG. 4 is a circuit schematic of an interval in an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a knife switch control system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a disconnecting link control system according to an embodiment of the present invention, where the disconnecting link control system according to the embodiment of the present invention is used to control multiple disconnecting links in an interval on a bus, where the interval includes a disconnecting link and a circuit breaker that are provided with an auxiliary switch, and as shown in fig. 1, the disconnecting link control system includes an auxiliary switch 1, a sampling module 2, a control module 3, and a control loop.
The interval is a branch line on a bus, an isolation switch, a grounding switch, a breaker, a relay and the like are arranged on the branch line, the switch is a device which has an obvious disconnection point, does not have an arc extinguishing device and can not be switched on and off under a load, and can be switched on and off after a power supply is cut off by the switch.
Specifically, as shown in fig. 2, each knife switch in the interval is provided with a corresponding control loop, the control loop includes a relay 303 and a mechanism box 4, a power input end of the mechanism box 4 is connected with a positive line L of a power supply through the relay 303, when the relay 303 is closed, the mechanism box 4 has a power input, the mechanism box 4 is unlocked, and the corresponding knife switch can be opened or closed, wherein the closing or opening of the relay 303 is determined according to the connection relationship of the knife switch in the interval, and the states of other knife switches, circuit breakers and relays in the interval.
As shown in fig. 1, the auxiliary switches 1 of the disconnecting link, the circuit breaker and the relay in the interval are connected with a power line L, the auxiliary switches 1 correspond to the sampling modules 2 one by one, that is, one auxiliary switch 1 is connected with the input end of one sampling module 2 to output a switching value signal at the output end of the sampling module 2, wherein, the auxiliary switch 1 can be a switch reflecting the switching values of the disconnecting link, the circuit breaker and the relay, exemplarily, one end of the auxiliary switch 1 is connected with the power supply, the other end is connected with the input end of the sampling module 2, the auxiliary switch 1 of the disconnecting link is in the on position when the disconnecting link is in the off position, so that the power supply is input into the sampling module 2 through the auxiliary switch 1, the sampling module 2 outputs the switching value signal which is a high level signal at the output end, otherwise, the auxiliary switch 1 is in the off position when the disconnecting link is in the off position, the power supply is input into the sampling module 2, the sampling module 2 outputs a low-level switching value signal at an output end.
As shown in fig. 1 and 2, each relay 303 in the control loop is controlled by a control module 3, and the control module 3 includes an and circuit 301 and a transistor 302, wherein a plurality of input terminals of the and circuit 301 are connected to an output terminal of at least one sampling module 2, an output terminal of the and circuit 301 is connected to a base terminal of the transistor 302, a collector terminal of the transistor 302 is connected to a power supply, and an emitter terminal is grounded through a coil of the relay 303.
The and-gate circuit 301 outputs a high-level signal when all input ends input a high-level signal, outputs a low-level signal when any one input end inputs a low-level signal, and in the control module 3 controlling each relay 303, a plurality of input ends of the and-gate circuit 301 are connected to the output ends of one or more corresponding sampling modules 2, as for the output end of which sampling module 2 one and-gate circuit 301 is specifically connected to, it is necessary to be related to the connection relationship between the knife-gate and other knife-gates, circuit breakers, and the like within an interval, and in practical application, a person skilled in the art can determine the sampling module 2 connected to the input end of the and-gate circuit 301.
As shown in fig. 1 and fig. 2, when the input ends of the and circuit 301 input the switching value signal of high level, the output high level signal drives the transistor 302 to conduct, the relay 303 is powered on and closed, the control circuit is conducted, the mechanism box 4 is powered on and unlocked to control the knife switch, when any input end of the and circuit 301 inputs the switching value signal of low level, the output low level signal drives the transistor 302 to stop, the relay 303 is powered off, the control circuit is disconnected, and the mechanism box 4 is powered off and locked to prohibit the knife switch from operating.
In the knife switch control system of the embodiment of the invention, the knife switches, the circuit breakers and the auxiliary switches connected with the pressure relays in the intervals output switching value signals through the output ends of the corresponding sampling modules, the power input end of the mechanism box in the control loop of each knife switch is connected with a power supply through a relay, the control module corresponding to the relay comprises an AND gate circuit and a triode, a plurality of input ends of the AND gate circuit are connected with the output end of at least one sampling module, the base electrode of the triode is connected with the output end of the AND gate circuit, the collector electrode of the triode is connected with the power supply, and the emitter electrode of the triode is grounded through the coil of the relay, so that the output signals of the sampling modules of other knife switches related to the knife switch control are input into the AND gate circuit of the control module to control the on-off or on-off of the relay in the control loop, on one hand, the output end of each sampling module can be connected to the AND gates of the plurality of the control modules, the circuit is simplified, on the other hand, the AND gate circuit outputs high level when the input ends input high level, and outputs low level when any input end inputs low level, programming is not needed, the requirement on the level of maintenance personnel is low, the logic of the AND gate circuit is stable and reliable, misoperation is avoided, on the other hand, the correctness of the locking logic of each control loop can be determined through a sampling module connected to the input end of the AND gate circuit, and fault troubleshooting is facilitated.
Example two
The embodiment of the present invention is optimized based on the first embodiment, as shown in fig. 3, the sampling module 2 of the embodiment of the present invention includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the auxiliary switch 1, the other end is grounded through the second resistor R2, and a common node of the first resistor R1 and the second resistor R2 is an output end OUT of the sampling module 2.
In an alternative embodiment, the sampling module 2 further includes an indicator light D, and the second resistor R2 is grounded through the indicator light D, and the indicator light is turned on when the auxiliary switch 1 outputs a high level signal, which indicates that the knife switch is open, and conversely, when the indicator light is turned off, which indicates that the knife switch is closed.
In another optional embodiment, the sampling module 2 further includes a filter capacitor C, one end of the filter capacitor C is connected to the output terminal OUT of the sampling module 2, and the other end of the filter capacitor C is grounded, so that the noise signal of the output terminal OUT can be filtered by the filter capacitor C, the accuracy of the switching value signal output by the output terminal OUT of the sampling module 2 is ensured, and the anti-interference capability of the disconnecting link control system is improved.
As shown in fig. 2, in an alternative embodiment of the present invention, the control circuit further includes a five-prevention lock 5, and a power input end of the mechanism box 4 is connected to the relay 303 through the five-prevention lock 5, wherein the five-prevention lock 5 may be a switch for preventing an erroneous operation, the five-prevention lock 5 is in a normally open state, when the five-prevention lock is unlocked by using a correct five-prevention key, the five-prevention lock is closed, the control circuit is turned on, and the mechanism box 4 can operate the knife gate after being unlocked by a power input.
In order to make the knife switch control system of the embodiment of the present invention more clearly understood by those skilled in the art, the knife switch control system is described below with reference to fig. 4 and 5
As shown in fig. 4, the bus bar includes a first bus bar 1M and a second bus bar 2M, the first bus bar 1M and the second bus bar 2M are connected by a bus tie switch GBM, a breaker DL is included in the compartment, one end of the breaker DL is connected with the first bus bar 1M and the second bus bar 2M by a first isolation disconnecting link 1G and a second isolation disconnecting link 2G, respectively, the other end is connected with a subsequent circuit by a third isolation disconnecting link 4G and a line voltage relay JIS, a common node of the breaker DL and the first isolation disconnecting link 1G and the second isolation disconnecting link 2G is grounded by a first grounding disconnecting link 02G, a common node of the breaker DL and the third isolation disconnecting link 4G is grounded by a second grounding disconnecting link 04G1, a common node of the third isolation disconnecting link 4G and the line voltage relay JIS is grounded by a third grounding disconnecting link 04G2, which is merely an example of a compartment, any number of circuit breakers, disconnecting switches and grounding switches can be included in the compartment.
Correspondingly, the control loop comprises a first control loop, a second control loop, a third control loop, a fourth control loop, a fifth control loop and a sixth control loop which are used for respectively controlling the first isolation switch 1G, the second isolation switch 2G, the third isolation switch 4G, the first grounding switch 02G, the second grounding switch 04G1 and the third grounding switch 04G2, wherein the fourth control loop and the fifth control loop share one relay.
As shown in fig. 5, the control module 3 includes a first control module 31 corresponding to the relay in the first control loop, a second control module 32 corresponding to the relay in the second control loop, a third control module 33 corresponding to the relay in the third control loop, a fourth control module 34 corresponding to the relays in the fourth control loop and the fifth control loop, and a fifth control module 35 corresponding to the relay in the sixth control loop, and accordingly, the first control module 31 is used for controlling the on or off of the first control loop of the first isolation switch 1G, the second control module 32 is used for controlling the on or off of the second control loop of the second isolation switch 2G, the third control module 33 is used for controlling the on or off of the third control loop of the third isolation switch 4G, the fourth control module 34 is used for controlling the on or off of the fourth control loop of the first grounding switch 02G, and a fifth control circuit for controlling the second grounding switch 04G1 to be turned on or off, and the fifth control module 35 is configured to control the third grounding switch 04G2 to be turned on or off.
As shown in fig. 5, the first control module 31 includes a first and gate circuit 3011 and a second and gate circuit 3012, the first and gate circuit 3011 includes four input ends, the second and gate circuit 3012 includes two input ends, an output end of the first and gate circuit 3011 and an output end of the second and gate circuit 3012 are both connected to a base of a transistor in the first control module 31, an output end of a sampling module connected to an auxiliary switch of the circuit breaker DL, an output end of a sampling module connected to an auxiliary switch of the second disconnecting switch 2G, an output end of a sampling module connected to an auxiliary switch of the first grounding switch 02G, and an output end of a sampling module connected to an auxiliary switch of the second grounding switch 04G1 are respectively connected to the four input ends of the first and gate circuit 3011, and an output end of a sampling module connected to an auxiliary switch of the bus bar switch GBM and an output end of a sampling module connected to an auxiliary switch of the first disconnecting switch 02G are respectively connected to two input ends of the second and gate circuit 3012.
The second control module 32 includes a third and-gate circuit 3013 and a fourth and-gate circuit 3014, the third and-gate circuit 3013 includes four input terminals, the fourth and-gate circuit 3014 includes two input terminals, the output terminal of the third and-gate circuit 3013 and the output terminal of the fourth and-gate circuit 3014 are both connected to the base of the transistor in the second control module 32, the output end of the sampling module connected with the auxiliary switch of the breaker DL, the output end of the sampling module connected with the auxiliary switch of the first isolating switch 1G, the output end of the sampling module connected with the auxiliary switch of the first grounding switch 02G, and the output end of the sampling module connected with the auxiliary switch of the second grounding switch 04G1 are respectively connected with four input ends of the third and circuit 3013, the output end of the sampling module connected to the auxiliary switch of the bus tie switch GBM and the output end of the sampling module connected to the auxiliary switch of the second isolation switch 2G are connected to two input ends of the fourth and circuit 3014, respectively.
The third control module 33 includes a fifth and-gate circuit 3015, the fifth and-gate circuit 3015 includes four input terminals, an output terminal of the fifth and-gate circuit 3015 is connected to a base of a transistor in the third control module 33, an output terminal of the sampling module connected to the auxiliary switch of the circuit breaker DL, an output terminal of the sampling module connected to the auxiliary switch of the first grounding switch 1G, an output terminal of the sampling module connected to the auxiliary switch of the second grounding switch 04G1, and an output terminal of the sampling module connected to the auxiliary switch of the third grounding switch 04G2 are respectively connected to the four input terminals of the fifth and-gate circuit 3015.
The fourth control module 34 includes a sixth and gate circuit 3016, the sixth and gate circuit 3016 includes four input ends, the output end of the sixth and gate circuit 3016 is connected to the base of the triode in the fourth control module 34, the output end of the sampling module connected to the auxiliary switch of the circuit breaker DL, the output end of the sampling module connected to the auxiliary switch of the first isolation switch 1G, the output end of the sampling module connected to the auxiliary switch of the second isolation switch 2G, and the output end of the sampling module connected to the auxiliary switch of the third isolation switch 3G are connected to the four input ends of the sixth and gate circuit 3016, respectively.
The fifth control module 35 includes a seventh and-gate circuit 3017, the seventh and-gate circuit 3017 includes two input terminals, an output terminal of the seventh and-gate circuit 3017 is connected to a base of a transistor in the fifth control module 35, an output terminal of the sampling module connected to the auxiliary switch of the line voltage relay YJS, and an output terminal of the sampling module connected to the auxiliary switch of the third isolation switch 4G are respectively connected to the two input terminals of the seventh and-gate circuit 3017.
As shown in fig. 4 and 5, the latching logic of each knife switch is as follows:
1) first isolation switch 1G lockout logic:
in the first control module 31 corresponding to the first isolation switch 1G, the input end of the first and gate circuit 3011 is connected to the output end of the sampling module connected to the auxiliary switch of the breaker DL, the output end of the sampling module connected to the auxiliary switch of the second isolation switch 2G, the output end of the sampling module connected to the auxiliary switch of the first grounding switch 02G, and the output end of the sampling module connected to the auxiliary switch of the second grounding switch 04G1, and the switching value signal is output from the output end of the sampling module, when the breaker DL, the second isolation switch 2G, the first grounding switch 02G, and the second grounding switch 04G1 are in open state, the corresponding auxiliary switches 1 are closed, the four input ends of the first and gate circuit 3011 all receive high level signals, the first and gate circuit 3011 outputs high level signals, the triode is conducted 302, the normally open contact of the relay 303 is closed, and the mechanism box 4 in the control loop is electrically unlocked, the first isolation switch 1G can be operated. When any one of the breaker DL, the second disconnecting switch 2G, the first grounding switch 02G, and the second grounding switch 04G1 is switched on, the first and circuit 3011 outputs a low level, the relay 303 is turned off, and the mechanism box 4 in the control circuit is not locked by the power input.
The latching and unlatching logic was described above with only the first isolation switch 1G, and the latching logic for each switch in fig. 4 and 5 is shown in table 1 below:
although the embodiment of the present invention has been described with reference to the circuit of the knife switch control system of fig. 5 and table 1 with the interval shown in fig. 4, in practical applications, those skilled in the art may change the circuit of fig. 5 and the knife switch locking logic of table 1 according to different intervals.
According to the embodiment of the invention, output signals of sampling modules of other switches related to switch control are input into the AND gate circuit of the control module to control the on/off of the relay in the control loop, on one hand, the output end of each sampling module can be connected to the AND gate circuits of a plurality of control modules, so that the circuit is simplified, on the other hand, the AND gate circuit outputs high level when the input ends input high level, and outputs low level when any input end inputs low level, so that programming is not needed, the requirement on the level of maintenance personnel is low, the logic of the AND gate circuit is stable and reliable, and misoperation is avoided, on the other hand, the correctness of the locking logic of each control loop can be determined by the sampling module connected to the input end of the AND gate circuit, and fault troubleshooting is facilitated.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides a switch control system for a plurality of switches in the interval on the control generating line, the interval includes switch and the circuit breaker that is provided with auxiliary switch, includes:
the control loops correspond to the disconnecting switches one by one, each control loop comprises a relay and a mechanism box, and the power supply input end of each mechanism box is connected with a power supply through the relay;
the input end of the sampling module is connected with a power supply through the auxiliary switch so as to output a switching value signal at the output end of the sampling module, wherein the switching value signal is at a low level when the disconnecting link or the circuit breaker is closed and at a high level when the disconnecting link or the circuit breaker is open;
the control modules correspond to the relays one by one and comprise an AND gate circuit and triodes, a plurality of input ends of the AND gate circuit are connected with the output end of at least one sampling module, the base electrode of each triode is connected with the output end of the AND gate circuit, the collector electrode of each triode is connected with the power supply, and the emitter electrode of each triode is grounded through a coil of each relay;
when the input ends of the AND gate circuit input high-level switching value signals, the AND gate circuit outputs high-level signals to drive the triode to be conducted, the relay is powered on and closed, the control circuit is conducted, the mechanism box is powered on and unlocked to control the knife gate, when any input end of the AND gate circuit inputs low-level switching value signals, the AND gate circuit outputs low-level signals to drive the triode to be cut off, the relay is powered off, the control circuit is disconnected, and the mechanism box is powered off and locked to prohibit the knife gate from operating.
2. The knife switch control system of claim 1, wherein the sampling module comprises a first resistor and a second resistor, one end of the first resistor is connected with the auxiliary switch, the other end of the first resistor is grounded through the second resistor, and a common node of the first resistor and the second resistor is an output end of the sampling module.
3. The knife gate control system of claim 2, wherein the sampling module further comprises an indicator light, and the second resistor is grounded through the indicator light.
4. The knife gate control system of claim 2, wherein the sampling module further comprises a filter capacitor, one end of the filter capacitor is connected with the output end of the sampling module, and the other end of the filter capacitor is grounded.
5. The knife gate control system of claim 1, wherein the control loop further comprises a five-prevention lock, and the power input of the mechanism box is connected to the relay through the five-prevention lock.
6. The knife switch control system according to any one of claims 1 to 5, characterized in that the bus comprises a first bus and a second bus, the first bus and the second bus are connected through a bus coupler switch, the compartment comprises a circuit breaker, one end of the circuit breaker is respectively connected with the first bus and the second bus through a first isolation knife switch and a second isolation knife switch, the other end of the circuit breaker is connected with a subsequent circuit through a third isolation knife switch and a line voltage relay in sequence, a common node of the circuit breaker and the first isolation knife switch and the second isolation knife switch is grounded through a first grounding knife switch, a common node of the circuit breaker and the third isolation knife switch is grounded through a second grounding knife switch, and a common node of the third isolation knife switch and the line voltage relay is grounded through a third grounding knife switch.
7. The knife switch control system of claim 6, wherein the control loop comprises a first control loop, a second control loop, a third control loop, a fourth control loop, a fifth control loop, and a sixth control loop for controlling the first isolation knife switch, the second isolation knife switch, the third isolation knife switch, the first grounding knife switch, the second grounding knife switch, and the third grounding knife switch respectively, wherein the fourth control loop and the fifth control loop share a relay;
the control modules comprise a first control module corresponding to a relay in the first control loop, a second control module corresponding to a relay in the second control loop, a third control module corresponding to a relay in the third control loop, a fourth control module corresponding to relays in the fourth control loop and the fifth control loop, and a fifth control module corresponding to a relay in the sixth control loop.
8. The knife-switch control system of claim 7, wherein the first control module comprises a first and-gate circuit and a second and-gate circuit, the first and-gate circuit comprises four inputs, the second and-gate circuit comprises two inputs, an output of the first and-gate circuit and an output of the second and-gate circuit are both connected to a base of a transistor in the first control module, an output of a sampling module connected to an auxiliary switch of the circuit breaker, an output of a sampling module connected to an auxiliary switch of the second isolation knife-switch, an output of a sampling module connected to an auxiliary switch of the first grounding knife-switch, an output of a sampling module connected to an auxiliary switch of the second grounding knife-switch are respectively connected to four inputs of the first and-gate circuit, an output of a sampling module connected to an auxiliary ground of the bus-coupled switch, And the output end of the sampling module connected with the auxiliary ground of the first isolation switch is respectively connected with two input ends of the second AND gate circuit.
9. The knife-switch control system of claim 7, wherein the second control module comprises a third and-gate circuit and a fourth and-gate circuit, the third and-gate circuit comprises four inputs, the fourth and-gate circuit comprises two inputs, an output of the third and-gate circuit and an output of the fourth and-gate circuit are both connected to a base of a transistor in the second control module, an output of a sampling module connected to an auxiliary switch of the circuit breaker, an output of a sampling module connected to an auxiliary switch of the first isolation knife-switch, an output of a sampling module connected to an auxiliary switch of the first grounding knife-switch, outputs of sampling modules connected to auxiliary switches of the second grounding knife-switch are respectively connected to four inputs of the third and-gate circuit, and an output of a sampling module connected to an auxiliary ground of the bus-coupled switch, And the output end of the sampling module connected with the auxiliary ground of the second isolation switch is respectively connected with two input ends of the fourth AND gate circuit.
10. The knife switch control system of claim 7, wherein the third control module comprises a fifth AND gate, the fifth AND gate comprises four inputs, an output of the fifth AND gate is connected to a base of a transistor in the third control module, an output of a sampling module connected to the auxiliary switch of the circuit breaker, an output of a sampling module connected to the auxiliary switch of the first grounding knife switch, an output of a sampling module connected to the auxiliary switch of the second grounding knife switch, and an output of a sampling module connected to the auxiliary switch of the third grounding knife switch are respectively connected to the four inputs of the fifth AND gate.
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| CN202111618978.0A CN114285169B (en) | 2021-12-27 | 2021-12-27 | Knife switch control system |
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