CN114285169B - Knife switch control system - Google Patents
Knife switch control system Download PDFInfo
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- CN114285169B CN114285169B CN202111618978.0A CN202111618978A CN114285169B CN 114285169 B CN114285169 B CN 114285169B CN 202111618978 A CN202111618978 A CN 202111618978A CN 114285169 B CN114285169 B CN 114285169B
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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 knife switch control system, which comprises a knife switch and a breaker, wherein the knife switch and the breaker are arranged at intervals, a control loop of the knife switch 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 switch, the 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 the output end of the AND gate circuit, a collector electrode is connected with the power supply, an emitter electrode is grounded through a coil of the relay, the output ends of the sampling module are connected to a plurality of AND gate circuits, a circuit is simplified, in addition, the AND gate circuit outputs a high level when the input ends are all input with a high level, the AND gate circuit outputs a low level when any input end inputs a low level, the system does not need programming, the requirement on personnel level is low, the AND gate circuit logic is stable and reliable, and the correctness of the control loop blocking logic 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 knife switch control system.
Background
In the distribution network, isolation disconnecting switches and grounding disconnecting switches are common disconnecting switches, each disconnecting switch is provided with an auxiliary switch for reacting to the switching value of the disconnecting switch, and a mechanism box is arranged to control the action of the disconnecting switch, and the mechanism box can be unlocked to operate the disconnecting switch when a power supply is input.
In general, whether a mechanism box corresponding to one knife switch has a power input is determined by the switching value 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 in series with the mechanism box of the knife switch between the positive pole and the negative pole of the power to form a control loop, in order to solve the problems that the control loop is complex in wiring and difficult to change locking logic when a plurality of knife switches are arranged, a PLC controller is adopted to simplify wiring in the prior art, logic control is realized through PLC programming, and the locking logic can be modified, but the following problems still exist when the PLC controller is adopted:
a) The programming program is unstable, and the probability of misoperation is high;
b) The PLC programming has high requirement 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 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 misoperation is high, the requirement of programming on the level of maintenance personnel is high, and the correctness of locking logic cannot be determined from wiring caused by using a PLC controller to program to realize disconnecting link control.
To solve the above problems, an embodiment of the present invention provides a disconnecting link control system for controlling a plurality of disconnecting links in a space on a bus, the space including a disconnecting link provided with an auxiliary switch and a circuit breaker, including:
the control loop is in one-to-one correspondence with the knife switches and comprises a relay and a mechanism box, and the power input end of the mechanism box is connected with a power supply through the relay;
the sampling modules are in one-to-one correspondence with the auxiliary switches, the input ends of the sampling modules are connected with a power supply through the auxiliary switches so as to output switching value signals at the output ends of the sampling modules, the switching value signals are low level when the disconnecting link or the circuit breaker is in the closed position, and high level when the disconnecting link or the circuit breaker is in the separated position;
the control module is in one-to-one correspondence with the relays and 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 is connected with the power supply, and the emitter electrode is grounded through a coil of the relay;
the control circuit is connected with the mechanism box, the mechanism box is electrically unlocked to control the knife switch, the AND gate circuit outputs a low-level signal to drive the triode to cut off when any low-level switching value signal is input to the input end, the relay is powered off, the control circuit is disconnected, and the mechanism box is powered off to lock so as to inhibit operation of the knife switch.
Optionally, the sampling module includes 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.
Optionally, the sampling module further includes 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 with the output end of the sampling module, and the other end of the filter capacitor is grounded.
Optionally, the control loop 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 busbar includes first busbar and second busbar, first busbar with the second busbar passes through female connection switch connection, the interval includes the circuit breaker, the one end of circuit breaker respectively through first isolation switch and second isolation switch with first busbar with the second busbar is connected, and the other end loops through third isolation switch and circuit to have the pressure relay to be connected with subsequent circuit, the circuit breaker with the public node of first isolation switch and second isolation switch passes through first ground connection switch ground connection, the circuit breaker with the public node of third isolation switch passes through second ground connection switch ground connection, the third isolation switch with the public node of circuit to have the pressure relay passes through third ground connection switch ground connection.
Optionally, 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 respectively 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, wherein the fourth control loop and the fifth control loop share one relay;
the control modules include 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 a relay 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 end of the first and gate circuit and the output end of the second and gate circuit are both connected with the base electrode of the triode in the first control module, the output end of the sampling module connected with the auxiliary switch of the circuit breaker, the output end of the sampling module connected with the auxiliary switch of the second isolation switch, the output end of the sampling module connected with the auxiliary switch of the first grounding switch, the output end of the sampling module connected with the auxiliary switch of the second grounding switch are respectively connected with the four input ends of the first and gate circuit, and the output end of the sampling module connected with the auxiliary ground of the first isolation switch is respectively connected with the two input ends of the second and gate circuit.
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 end of the third and gate circuit and the output end of the fourth and gate circuit are both connected with the base electrode of the triode in the second control module, the output end of the sampling module connected with the auxiliary switch of the circuit breaker, the output end of the sampling module connected with the auxiliary switch of the first isolation switch, the output end of the sampling module connected with the auxiliary switch of the first grounding switch, the output end of the sampling module connected with the auxiliary switch of the second grounding switch are respectively connected with the four input ends of the third and gate circuit, and the output end of the sampling module connected with the auxiliary ground of the master connection switch and the output end of the sampling module connected with the auxiliary ground of the second isolation switch are respectively connected with the two input ends of the fourth and gate circuit.
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 with a base electrode of a triode in the third control module, an output end of a sampling module connected with an auxiliary switch of the circuit breaker, an output end of a sampling module connected with an auxiliary switch of the first grounding switch, an output end of a sampling module connected with an auxiliary switch of the second grounding switch, and an output end of a sampling module connected with an auxiliary switch of the third grounding switch are respectively connected with the 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, the output end of the sixth and gate circuit is connected with the base electrode of the triode in the fourth control module, the output end of the sampling module connected with the auxiliary switch of the circuit breaker, the output end of the sampling module connected with the auxiliary switch of the first isolation switch, the output end of the sampling module connected with the auxiliary switch of the second isolation switch, and the output end of the sampling module connected with the auxiliary switch of the third isolation switch are respectively connected with the four input ends of the sixth and gate circuit.
Optionally, the fifth control module includes a seventh and gate circuit, where 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, an output end of the sampling module connected to an auxiliary switch of the line voltage relay, and an output end of the 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 switch, the breaker and the auxiliary switch of the line-pressed relay in the interval 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 one 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 is connected with the power supply, and the emitter electrode is grounded through the coil of the relay, so that the output signals of sampling modules of other knife switches related to knife switch control are input into the AND gate circuit of the control module to control the switch on or off of the relay in the control loop.
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 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 schematic circuit diagram of one compartment in an embodiment of the invention;
fig. 5 is a schematic circuit diagram of a knife switch control system according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a knife switch control system according to an embodiment of the present invention, where the knife switch control system is used for controlling a plurality of knife switches in a gap on a bus, and the gap includes a knife switch and a breaker provided with an auxiliary switch, as shown in fig. 1, and the knife switch control system includes an auxiliary switch 1, a sampling module 2, a control module 3 and a control loop.
The interval is the branch line on the bus, be provided with isolation switch, ground knife switch, circuit breaker, relay etc. on the branch line, the switch is the device that has obvious disconnection point, does not have arc extinguishing device, can not take the load to divide the combined floodgate, only can carry out the divide-shut brake operation after the switch cuts off the power, will cut off power equipment and electrified equipment through separating isolation switch in the interval, make power equipment and earth intercommunication through closing ground knife switch again, make staff can contact this power equipment safely, to every knife switch, need establish ties other switches in this interval, the auxiliary switch of circuit breaker, relay judges whether this knife switch satisfies the separating brake or the combined floodgate condition.
Specifically, as shown in fig. 2, each knife switch in the interval is provided with a corresponding control loop, the control loop comprises a relay 303 and a mechanism box 4, the power input end of the mechanism box 4 is connected with the positive electrode line L of the power supply through the relay 303, when the relay 303 is closed, the mechanism box 4 has power input, the mechanism box 4 is unlocked, and the corresponding knife switch can be subjected to opening or closing operation, wherein the closing or opening of the relay 303 is determined according to the connection relation of the knife switch in the interval and the states of other knife switches, breakers and relays in the interval.
As shown in fig. 1, an auxiliary switch 1 of a disconnecting link, a circuit breaker and a relay in an interval is connected with a power line L, the auxiliary switch 1 is in one-to-one correspondence with a sampling module 2, that is, one auxiliary switch 1 is connected with an input end of one sampling module 2 to output a switching value signal at an output end of the sampling module 2, wherein the auxiliary switch 1 can be a switch for reflecting switching values of the disconnecting link, the circuit breaker and the relay, one end of the auxiliary switch 1 is connected with a power supply, the other end of the auxiliary switch 1 is connected with an input end of the sampling module 2, the auxiliary switch 1 of the disconnecting link is in a closing position when the disconnecting link is in a switching state, so that the power supply inputs the sampling module 2 via the auxiliary switch 1, the sampling module 2 outputs a switching value signal at an output end, the switching value signal is a high level signal, otherwise, the auxiliary switch 1 is in a switching position when the disconnecting link is in a switching state, no power supply is input to the sampling module 2, and the sampling module 2 outputs a switching value signal of a low level at the 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 triode 302, wherein a plurality of input ends of the and circuit 301 are connected with an output end of at least one sampling module 2, an output end of the and circuit 301 is connected with a base electrode of the triode 302, a collector electrode of the triode 302 is connected with a power supply, and an emitter electrode is grounded through a coil of the relay 303.
The and circuit 301 outputs a high-level signal when all input terminals input a high-level signal, and outputs a low-level signal when any input terminal inputs a low-level signal, in the control module 3 controlling each relay 303, a plurality of input terminals of the and circuit 301 are connected with output terminals of one or more corresponding sampling modules 2, and as to which output terminal of the sampling module 2 is specifically connected with one and circuit 301, it is necessary to correlate the connection relationship between the knife gate and other knife gates, circuit breakers, and other devices according to the interval, and in practical application, a person skilled in the art can determine the sampling module 2 connected with the input terminal of the and circuit 301.
As shown in fig. 1 and 2, when the and circuit 301 inputs a high-level switching value signal at an input end, the high-level signal is output to drive the triode 302 to be turned on, the relay 303 is turned on, the control loop is turned on, the mechanism box 4 is turned on to unlock the knife switch for controlling the knife switch, when the and circuit 301 inputs a low-level switching value signal at any input end, the low-level signal is output to drive the triode 302 to be turned off, the relay 303 is turned off, the control loop is turned off, and the mechanism box 4 is turned off to lock to prohibit the operation of the knife switch.
In the knife switch control system of the embodiment of the invention, the knife switch, the breaker and the auxiliary switch of the line-pressed relay in the interval 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 one 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 is connected with the power supply, and the emitter electrode is grounded through the coil of the relay, so that the output signals of sampling modules of other knife switches related to knife switch control are input into the AND gate circuit of the control module to control the switch on or off of the relay in the control loop.
Example two
The embodiment of the present invention is optimized based on the first embodiment, as shown in fig. 3, the sampling module 2 in 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 terminal 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, where the indicator light is turned on when the auxiliary switch 1 outputs a high level signal, so as to indicate that the knife switch is on, and otherwise, the indicator light is turned off so as to indicate that the knife switch is on.
In another alternative embodiment, the sampling module 2 further includes a filter capacitor C, one end of the filter capacitor C is connected to the output end OUT of the sampling module 2, and the other end of the filter capacitor C is grounded, so that a noise signal of the output end OUT can be filtered through the filter capacitor C, accuracy of a switching value signal output by the output end OUT of the sampling module 2 is guaranteed, and anti-interference capability of the knife switch 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 the power input end of the mechanism box 4 is connected to the relay 303 through the five-prevention lock 5, where the five-prevention lock 5 may be a switch for preventing misoperation, and the five-prevention lock 5 is in a normally open state, and when the five-prevention lock is opened by using a correct five-prevention key, the five-prevention lock is closed, the control circuit is turned on, and the mechanism box 4 has a power input for unlocking and then can operate the knife switch.
In order to make the person skilled in the art more clearly understand the knife switch control system according to the embodiment of the present invention, the knife switch control system will be 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 through a bus bar switch GBM, a circuit breaker DL is included in the interval, one end of the circuit breaker DL is connected with the first bus bar 1M and the second bus bar 2M through the first isolation switch 1G and the second isolation switch 2G respectively, the other end of the circuit breaker DL is connected with a subsequent circuit through the third isolation switch 4G and the line voltage relay JIS in turn, a common node of the circuit breaker DL and the first isolation switch 1G and the second isolation switch 2G is grounded through the first grounding switch 02G, a common node of the circuit breaker DL and the third isolation switch 4G is grounded through the second grounding switch 04G1, and in the above example, which is only one interval, any number of circuit breakers, isolation switches and grounding switches may be further included in the interval.
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 knife switch 1G, the second isolation knife switch 2G, the third isolation knife switch 4G, the first grounding knife switch 02G, the second grounding knife switch 04G1 and the third grounding knife 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 a relay in the first control loop, a second control module 32 corresponding to a relay in the second control loop, a third control module 33 corresponding to a relay in the third control loop, a fourth control module 34 corresponding to a relay in the fourth control loop and a fifth control loop, a fifth control module 35 corresponding to a relay in the sixth control loop, respectively, the first control module 31 being for controlling on or off of the first control loop of the first isolation knife 1G, the second control module 32 being for controlling on or off of the second control loop of the second isolation knife 2G, the third control module 33 being for controlling on or off of the third control loop of the third isolation knife 4G, the fourth control module 34 being for controlling on or off of the fourth control loop of the first ground knife 02G, and the fifth control module 35 being for controlling on or off of the fifth control loop of the second ground knife 04G1, the fifth control module 35 being for controlling on or off of the third ground knife 04G 2G.
As shown in fig. 5, the first control module 31 includes a first and gate 3011 and a second and gate 3012, the first and gate 3011 includes four input terminals, the second and gate 3012 includes two input terminals, the output terminal of the first and gate 3011 and the output terminal of the second and gate 3012 are both connected to the base of the triode in the first control module 31, the output terminal of the sampling module connected to the auxiliary switch of the circuit breaker DL, the output terminal of the sampling module connected to the auxiliary switch of the second isolation switch 2G, the output terminal of the sampling module connected to the auxiliary switch of the first ground switch 02G, and the output terminal of the sampling module connected to the auxiliary switch of the second ground switch 04G1 are respectively connected to the four input terminals of the first and gate 3011, and the output terminal of the sampling module connected to the auxiliary switch of the first isolation switch 02G is respectively connected to the two input terminals of the second and gate 3012.
The second control module 32 includes a third and gate 3013 and a fourth and gate 3014, the third and gate 3013 includes four inputs, the fourth and gate 3014 includes two inputs, the output of the third and gate 3013 and the output of the fourth and gate 3014 are both connected to the base of the triode in the second control module 32, the output of the sampling module connected to the auxiliary switch of the circuit breaker DL, the output of the sampling module connected to the auxiliary switch of the first isolation switch 1G, the output of the sampling module connected to the auxiliary switch of the first ground switch 02G, and the output of the sampling module connected to the auxiliary switch of the second ground switch 04G1 are respectively connected to the four inputs of the third and gate 3013, the output of the sampling module connected to the auxiliary switch of the female switch GBM, and the output of the sampling module connected to the auxiliary switch of the second isolation switch 2G are respectively connected to the two inputs of the fourth and gate 3014.
The third control module 33 includes a fifth and gate 3015, the fifth and gate 3015 includes four input terminals, the output terminal of the fifth and gate 3015 is connected to the base of the triode in the third control module 33, the output terminal of the sampling module connected to the auxiliary switch of the circuit breaker DL, the output terminal of the sampling module connected to the auxiliary switch of the first grounding switch 1G, the output terminal of the sampling module connected to the auxiliary switch of the second grounding switch 04G1, and the 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 3015.
The fourth control module 34 includes a sixth and gate 3016, the sixth and gate 3016 includes four input terminals, the output terminal of the sixth and gate 3016 is connected to the base of the triode in the fourth control module 34, the output terminal of the sampling module connected to the auxiliary switch of the circuit breaker DL, the output terminal of the sampling module connected to the auxiliary switch of the first isolation switch 1G, the output terminal of the sampling module connected to the auxiliary switch of the second isolation switch 2G, and the output terminal of the sampling module connected to the auxiliary switch of the third isolation switch 3G are respectively connected to the four input terminals of the sixth and gate 3016.
The fifth control module 35 includes a seventh and gate 3017, where the seventh and gate 3017 includes two input ends, an output end of the seventh and gate 3017 is connected to a base of a triode in the fifth control module 35, an output end of a sampling module connected to an auxiliary switch of the line-voltage relay YJS, and an output end of the sampling module connected to an auxiliary switch of the third isolation switch 4G are respectively connected to two input ends of the seventh and gate 3017.
As shown in fig. 4 and 5, the latching logic of each knife gate is as follows:
1) First isolation knife 1G lockout logic:
in the first control module 31 corresponding to the first isolation switch 1G, the input end of the first and gate 3011 is connected to 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 second isolation switch 2G, the output end of the sampling module connected to the auxiliary switch of the first grounding switch 02G, and the switching value signal output by the output end of the sampling module connected to the auxiliary switch of the second grounding switch 04G1, when the circuit breaker DL, the second isolation switch 2G, the first grounding switch 02G, and the second grounding switch 04G1 are in the open state, the corresponding auxiliary switches 1 are closed, the four input ends of the first and gate 3011 receive the high-level signal, the first and gate 3011 outputs the high-level signal, the triode is turned on 302, the normally open contact of the relay 303 is closed, and the mechanism box 4 in the control loop is electrically unlocked, so that the first isolation switch 1G can be operated. When any one of the circuit breaker DL, the second isolating switch 2G, the first grounding switch 02G, and the second grounding switch 04G1 is closed, the first and gate 3011 outputs a low level, the relay 303 is opened, and the mechanism box 4 in the control loop has no power input to be blocked.
The latching and unlatching logic is described above with respect to only the first isolation knife 1G, with the latching logic for each knife in fig. 4 and 5 as shown in table 1 below:
although embodiments of the present invention illustrate the knife switch lockout logic with the circuit of the knife switch control system of fig. 5 and table 1 at the intervals shown in fig. 4, in practice, one skilled in the art may modify the circuit of fig. 5 and the knife switch lockout logic of table 1 according to different intervals.
The embodiment of the invention inputs the output signals of the sampling modules of other knife switches related to knife switch control into the AND gate circuit of the control module to control the relay in the control loop to be closed or opened, 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 a low level when the input ends are all input with a high level, and outputs a low level when any input end is input with a low level, programming is not needed, the requirement on the level of maintenance personnel is low, the AND gate circuit logic is stable and reliable, misoperation is avoided, and on the other hand, the correctness of the locking logic of each control loop can be determined through the sampling module connected with the input end of the AND gate circuit, and the fault detection is facilitated.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A knife switch control system for controlling a plurality of knife switches in a compartment on a bus, the compartment including a knife switch provided with an auxiliary switch and a circuit breaker, comprising:
the control loop is in one-to-one correspondence with the knife switches and comprises a relay and a mechanism box, and the power input end of the mechanism box is connected with a power supply through the relay;
the sampling modules are in one-to-one correspondence with the auxiliary switches, the input ends of the sampling modules are connected with a power supply through the auxiliary switches so as to output switching value signals at the output ends of the sampling modules, the switching value signals are low level when the disconnecting link or the circuit breaker is in the closed position, and high level when the disconnecting link or the circuit breaker is in the separated position;
the control module is in one-to-one correspondence with the relays and 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 is connected with the power supply, and the emitter electrode is grounded through a coil of the relay;
when the high-level switching value signals are input into any input end, the AND gate circuit outputs the low-level signals to drive the triode to cut off, the relay is powered on, the control loop is powered on, the mechanism box is powered off to control the disconnecting link, when any input end inputs the low-level switching value signals, the AND gate circuit outputs the low-level signals to drive the triode to cut off, the relay is powered off, the control loop is powered off, and the mechanism box is powered off and locked to prohibit the operation of the disconnecting link;
the bus comprises a first bus and a second bus, the first bus and the second bus are connected through a bus-bar switch, the interval comprises a circuit breaker, one end of the circuit breaker is connected with the first bus and the second bus through a first isolation disconnecting link and a second isolation disconnecting link respectively, the other end of the circuit breaker is connected with a subsequent circuit through a third isolation disconnecting link and a circuit voltage relay in sequence, a public node of the circuit breaker and the first isolation disconnecting link and a public node of the second isolation disconnecting link are grounded through a first grounding disconnecting link, a public node of the circuit breaker and the third isolation disconnecting link is grounded through a second grounding disconnecting link, and a public node of the third isolation disconnecting link and the circuit voltage relay is grounded through a third grounding disconnecting link.
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, the second resistor being grounded through the indicator light.
4. The knife switch control system of claim 2 wherein the sampling module further comprises a filter capacitor having one end connected to the output of the sampling module and the other end grounded.
5. The knife switch control system of claim 1 wherein the control loop further comprises a five-way lock, the power input of the mechanism box being connected to the relay through the five-way lock.
6. The knife gate control system of any one of claims 1-5, wherein the control loop includes a first control loop, a second control loop, a third control loop, a fourth control loop, a fifth control loop, a sixth control loop for controlling the first isolation knife, the second isolation knife, the third isolation knife, the first ground knife, the second ground knife, the third ground knife, respectively, the fourth control loop and the fifth control loop sharing a relay;
the control modules include 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 a relay in the fourth control loop and the fifth control loop, and a fifth control module corresponding to a relay in the sixth control loop.
7. The knife gate control system of claim 6, 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, the output of the first and gate circuit and the output of the second and gate circuit are both connected with the base of the triode in the first control module, the output of the sampling module connected with the auxiliary switch of the circuit breaker, the output of the sampling module connected with the auxiliary switch of the second isolation knife, the output of the sampling module connected with the auxiliary switch of the first ground knife, the output of the sampling module connected with the auxiliary switch of the second ground knife are respectively connected with the four inputs of the first and gate circuit, the output of the sampling module connected with the auxiliary ground of the female connection switch, and the output of the sampling module connected with the auxiliary ground of the first isolation knife are respectively connected with the two inputs of the second and gate circuit.
8. The knife gate control system of claim 6, wherein the second control module comprises a third and gate circuit and a fourth and gate circuit, the third and gate circuit comprises four input ends, the fourth and gate circuit comprises two input ends, the output end of the third and gate circuit and the output end of the fourth and gate circuit are both connected with the base electrode of the triode in the second control module, the output end of the sampling module connected with the auxiliary switch of the circuit breaker, the output end of the sampling module connected with the auxiliary switch of the first isolation knife, the output end of the sampling module connected with the auxiliary switch of the first grounding knife, the output end of the sampling module connected with the auxiliary switch of the second grounding knife are respectively connected with the four input ends of the third and gate circuit, and the output end of the sampling module connected with the auxiliary ground of the female connection switch and the output end of the sampling module connected with the auxiliary ground of the second isolation knife are respectively connected with the two input ends of the fourth and gate circuit.
9. The knife gate control system of claim 6, wherein the third control module comprises a fifth and circuit, the fifth and circuit comprising four inputs, the output of the fifth and circuit being connected to the base of a transistor in the third control module, the output of the sampling module being connected to the auxiliary switch of the circuit breaker, the output of the sampling module being connected to the auxiliary switch of the first grounding knife, the output of the sampling module being connected to the auxiliary switch of the second grounding knife, the output of the sampling module being connected to the auxiliary switch of the third grounding knife being connected to the four inputs of the fifth and circuit, respectively.
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