Control circuit for preventing misoperation of high-voltage incoming line

Abstract

The invention relates to the technical field of high-voltage interlocking control, in particular to a control circuit for preventing high-voltage incoming line misoperation, which comprises a switching-on misoperation acquisition circuit, a switching-on misoperation loop, a switching-off misoperation acquisition circuit and a switching-off misoperation loop, wherein the switching-on misoperation acquisition circuit is used for acquiring switching-on and switching-off state signals of an incoming circuit breaker and a load circuit breaker so as to judge the action of a first intermediate relay; the switching-on misoperation loop judges whether to switch on or switch off the switching-on loop according to the state signal of the first intermediate relay; and the opening misoperation acquisition circuit is used for acquiring opening and closing state signals of the incoming circuit breaker and the load circuit breaker, and judging the action of the second intermediate relay through signal comparison. The problems that an existing high-voltage inlet wire switch lacks control linkage limitation in power failure and power transmission operation, and misoperation is prone to occurring are solved.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage interlocking control processing, and in particular to a control circuit for preventing misoperation of high-voltage incoming lines. Background Art

[0002] In the power supply and distribution system, the principle of power outage and power supply at each level is followed. When a high-voltage distribution room needs to be shut down for maintenance, the power outage should start from the lowest-level on-site low-voltage load, and the lower-level low-voltage power supply should be shut down first, and then the high-voltage power supply should be shut down. When the high-voltage distribution room is powered off, the high-voltage load switch should be stopped first, and after all load switches are powered off and opened, the high-voltage room incoming line switch should be stopped last. When supplying power, the power should be supplied from the higher-level switch to the last-level on-site low-voltage switch step by step. This is to avoid operational confusion and prevent sudden large-scale power outages and misoperation accidents such as direct closing of high-voltage incoming lines with loads.

[0003] Even if normal power outage operations rely solely on human management and regulatory requirements, they are still affected by the physical and mental state of the operators and may result in misoperation accidents caused by various reasons such as incorrect selection of the operation object, forgotten and confused operation instructions, unclear or omitted operation instructions, and incorrect on-site equipment confirmation. When a power supply accident occurs and the power supply of the superior power source is interrupted, the power production operators are faced with emergencies and are under tremendous pressure to make quick responses, restore normal power transmission, and eliminate the impact of power outages. At this time, it is more likely to produce misoperation behaviors, triggering human operation accidents and causing adverse effects.

[0004] During the power outage operation, after the busbar and the main power supply of the incoming line are cut off, the high-voltage load switches can still remain in the original closed state; if it is not confirmed clearly at this time, it is easy to make mistakes in closing the incoming line with load; the danger is that many on-site high-voltage loads will suddenly be energized or started, causing safety hazards; closing the incoming line with load will also generate a very large closing impact overcurrent due to the simultaneous power supply of many loads, and in severe cases it will cause an accident of over-level protection tripping; when the high-voltage incoming line is misoperated due to a power outage, it will cause a sudden power outage of large-scale equipment with serious impact; considering that misoperation of the incoming line switch is easy to occur and the impact is huge, it is very necessary to add a control to prevent misoperation of the high-voltage incoming line switch in the incoming line switch control circuit. Summary of the invention

[0005] Aiming at the deficiencies of the existing circuits, the present invention solves the problem that the existing high-voltage incoming line switch lacks control interlocking restrictions and is prone to misoperation during power outage operation.

[0006] The technical solution adopted by the present invention is: a control circuit for preventing misoperation of high-voltage incoming lines comprises:

[0007] The closing error operation collection circuit, the closing error operation circuit, the opening error operation collection circuit and the opening error operation circuit are electrically connected with the closing error operation circuit, the opening error operation collection circuit and the opening error operation circuit in sequence; wherein,

[0008] The closing error operation acquisition circuit is used to obtain the opening and closing state signals of the incoming circuit breaker and several load circuit breakers; through signal comparison, it is determined whether to drive the first intermediate relay (KA1) to operate; when the incoming circuit breaker is in the open state, any load circuit breaker is in the closed state, the circuit is turned on, and the first intermediate relay operates; when the incoming circuit breaker is in the closed state, the first intermediate relay does not operate;

[0009] The closing misoperation circuit decides whether to connect or disconnect the closing circuit according to the status signal of the first intermediate relay to avoid the incoming line closing misoperation;

[0010] The opening misoperation acquisition circuit obtains the opening and closing state signals of the incoming circuit breaker and several load circuit breakers; through signal comparison, it is determined whether to drive the second intermediate relay (KA2) to operate; when the incoming circuit breaker is in the closed state, any load circuit breaker is in the closed state, the circuit is turned on, and the second intermediate relay operates; when the incoming circuit breaker is in the open state, the second intermediate relay does not operate;

[0011] The opening misoperation circuit decides whether to connect or disconnect the opening circuit according to the status signal of the second intermediate relay to avoid the incoming line opening misoperation.

[0012] As a preferred embodiment of the present invention, the closing error operation collection circuit includes: a number of load circuit breakers QF1 to QFN, a normally closed contact 1QF-1 of the incoming circuit breaker 1QF, and an intermediate relay KA1. The first normally open contacts of the load circuit breakers QF1 to QFN are connected in parallel, and the right end is connected to the left end of the normally closed contact 1QF-1, and the right end of 1QF-1 is connected to the left end of KA1.

[0013] As a preferred embodiment of the present invention, the closing misoperation circuit includes: a normally open contact S8, a normally open contact S9, a normally closed contact KA1-1, a control pressure plate 1LP, the 3rd and 4th nodes of the transfer switch SA, the 1st and 2nd nodes of SA, the 1st and 2nd nodes of the opening and closing switch KK, the normally closed point 1QF-2 of the incoming circuit breaker 1QF, the normally open point S1 and the closing coil HQ; the right end of S8 is connected to the common end of the 4th node of SA and the 1st node of KK; the right end of S9 is connected to the left end of KA1-1 and the left end of 1LP respectively, the right common end of 1LP and KA1-1 is connected to the 3rd node of SA and the 1st node of SA respectively, the 2nd node of SA is connected to the 2nd node of KK and the left common end of 1QF-2, the right end of 1QF-2 is connected to the left end of S1, and the right end of S1 is connected to the left end of HQ.

[0014] As a preferred embodiment of the present invention, the circuit for collecting faulty opening operations includes: a number of load circuit breakers QF1 to QFN, a normally open contact 1QF-4 of the incoming circuit breaker 1QF, and an intermediate relay KA2. The right ends of the second normally open contacts of the load circuit breakers QF1 to QFN are connected in parallel and are connected to the left end of the normally open contact 1QF-4, and the right end of 1QF-4 is connected to the left end of KA2.

[0015] As a preferred embodiment of the present invention, the opening error operation circuit includes: a normally closed contact KA2-1, control pressure plates 2LP, 3LP, the 5th and 6th nodes of the transfer switch SA, the 3rd and 4th nodes of the opening and closing switch KK, a normally open point 1QF-3 and an opening coil TQ; the left end of KA2-1 is connected to the left ends of 2LP and 3LP respectively, and the right end of KA2-1 is connected to the right end of 2LP, the 3rd node of KK and the 5th node of SA; the 6th node of SA is connected to the 4th node of KK, the right end of 3LP and the left end of 1QF-3 respectively, and the right end of 1QF-3 is connected to the left end of TQ.

[0016] As a preferred implementation manner of the present invention, it also includes: the closing alarm circuit is electrically connected to the closing erroneous operation circuit.

[0017] As a preferred embodiment of the present invention, the closing alarm circuit includes: a knob switch 1SB, a normally open contact KA1-2 of KA1, a warning light 1HR and a warning bell DL, the right end of 1SB is connected to the left end of KA1-2, the right end of KA1-2 is respectively connected to the left ends of 1HR and DL, and the right end of 1HR is connected to the right end of DL.

[0018] As a preferred embodiment of the present invention, it also includes: a switch-off alarm circuit, and the switch-off alarm circuit is electrically connected to the switch-off erroneous operation circuit.

[0019] As a preferred embodiment of the present invention, the trip alarm circuit includes: a knob switch 2SB, a normally open contact KA2-2 of KA2, a normally closed contact KA2-3 of KA2, and warning lights 2HR and 3HR. The right end of 2SB is connected to the left ends of KA2-2 and KA2-3 respectively, the right end of KA2-2 is connected to the left end of 2HR, the right end of KA2-3 is connected to the left end of 3HR, and the right end of 2HR is connected to the right end of 3HR.

[0020] Beneficial effects of the present invention:

[0021] 1. A control circuit for preventing misoperation of the incoming circuit breaker is used to limit and prevent misoperation accidents of the incoming circuit breaker during power outage operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a logic block diagram of the control circuit for preventing misoperation of high-voltage incoming lines of the present invention;

[0023] Figure 2 It is a control circuit diagram for preventing misoperation of high-voltage incoming lines of the present invention;

[0024] Figure 3 This is a schematic diagram of the incorrect closing operation;

[0025] Figure 4 This is a schematic diagram of incorrect opening operation. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore it only shows the components related to the present invention.

[0027] like Figure 1 , 2 As shown, a control circuit for preventing misoperation of high-voltage incoming lines includes: a closing misoperation collection circuit, a closing misoperation circuit, an opening misoperation collection circuit and an opening misoperation circuit. The closing misoperation collection circuit, the closing misoperation circuit, the opening misoperation collection circuit and the opening misoperation circuit are connected between the control power supply +KM and -KM at both ends. The control power supply is usually 220V DC.

[0028] The closing error operation collection circuit includes: several load circuit breakers QF1 to QFN, the normally closed contact 1QF-1 of the incoming circuit breaker 1QF, and the intermediate relay KA1. The first normally open contacts of the load circuit breakers QF1 to QFN are connected in parallel, and the left end is connected to +KM, and the right end is connected in series with the normally closed contact 1QF-1 of 1QF. The right end of 1QF-1 is connected to the left end of KA1, and the right end of KA1 is connected to -KM.

[0029] QF1-1, QF2-1, ..., QFN-1 are first normally open contacts of QF1 to QFN.

[0030] The closing misoperation circuit includes: the normally open contact S8 of the 1QF test position, the normally open contact S9 of the 1QF working position, the normally closed contact KA1-1 of KA1, the control pressure plate 1LP, the 3rd and 4th nodes of the transfer switch SA, the 1st and 2nd nodes of the transfer switch SA, the 1st and 2nd nodes of the opening and closing switch KK, the normally closed point 1QF-2 of 1QF, the normally open point S1 of the energy storage mechanism of 1QF, and the closing coil HQ of 1QF; the left end of S8 is connected to +KM, and the right end is connected to the first 4 nodes and the common end of the 1st node of KK; the left end of S9 is connected to +KM, and the right end is connected to the left end of KA1-1 and the left end of 1LP respectively. The right common ends of 1LP and KA1-1 are connected to the 3rd node of SA and the 1st node of SA respectively. The 2nd node of SA is connected in series with the remote control closing signal and then connected to the common end of the 2nd node of KK and the left end of 1QF-2. The right end of 1QF-2 is connected to the left end of S1. The right end of S1 is connected to HQ and then to -KM.

[0031] The closing alarm circuit includes: knob switch 1SB, normally open contact KA1-2 of KA1, warning light 1HR, and alarm bell DL. The left end of 1SB is connected to +KM, and the right end is connected to the left end of KA1-2. The right end of KA1-2 is connected to the left ends of 1HR and DL respectively, and the right end of 1HR and the right end of DL are connected to -KM.

[0032] The circuit for collecting the faulty opening operation includes: several load circuit breakers QF1 to QFN, the normally open contact 1QF-4 of the incoming circuit breaker 1QF, and the intermediate relay KA2. The second normally open contacts of the load circuit breakers QF1 to QFN are connected in parallel, and the left end is connected to +KM, and the right end is connected in series with the normally closed contact 1QF-4 of 1QF. The right end of 1QF-4 is connected to the left end of the intermediate relay KA2, and the right end of the intermediate relay KA2 is connected to -KM.

[0033] QF1-2, QF2-2, ..., QFN-2 are second normally open contacts of QF1 to QFN.

[0034] The opening misoperation circuit includes: the normally closed contact KA2-1 of KA2, the control pressure plates 2LP, 3LP, the 5th and 6th nodes of the transfer switch SA, the 3rd and 4th nodes of the opening and closing switch KK, the normally open point 1QF-3 of 1QF, and the opening coil TQ of 1QF; the left end of KA2-1 is connected to the left ends of 2LP, 3LP and +KM respectively, and the right end is connected to the right end of 2LP, the 3rd node of KK, and the 5th node of SA; after the 6th node of SA is connected in series with the remote control opening signal, the right end of 3LP is connected in series with the protection opening signal, and then connected to the 4th node of KK and the left end of 1QF-3, the right end of 1QF-3 is connected to the left end of TQ, and the right end of TQ is connected to -KM.

[0035] The trip alarm circuit includes: knob switch 2SB, KA2's normally open contact KA2-2, KA2's normally closed contact KA2-3, warning lights 2HR and 3HR. The left end of 2SB is connected to +KM, and the right end is connected to the left ends of KA2-2 and KA2-3 respectively. The right end of KA2-2 is connected to the left end of 2HR, the right end of KA2-3 is connected to the left end of 3HR, and the right ends of 2HR and 3HR are connected to -KM.

[0036] Function of the closing error operation control part: When 1QF is in the open state, 1QF-1 is closed, and any one of the first contacts of each branch QF is in the closed state, KA1 is energized and operates, disconnecting the working position closing circuit through the normally closed contact KA1-1, and limiting the closing of 1QF; at the same time, the normally open contact KA1-2 is closed, turning on the alarm signal light 1HR and the alarm bell DL, alerting the operator, and checking the status of each branch QF to avoid erroneous operation caused by closing with load.

[0037] When the closing error operation control is in use, 1LP should be in the disconnected position; when the closing error operation control needs to be released during equipment commissioning or other special circumstances, 1LP can be placed in the connected position; when the closing alarm is in use, 1SB is placed in the connected position; when the closing alarm is not required, 1SB is placed in the disconnected position.

[0038] When 1QF is in the open state and all the first contacts of QF are in the open state, KA1 will not be energized, the normally closed contact KA1-1 will be closed, the closing circuit will be connected, and the normal closing operation will not be affected; the normally open contact KA1-2 will be disconnected, the alarm signal light 1HR and the alarm bell DL will not be energized, and no alarm signal will be issued.

[0039] When 1QF is in the closed state, the normally closed contact 1QF-1 is disconnected, KA1 is not energized, the closing control does not work, and normal operation is not affected.

[0040] When 1QF is in the test position, it indicates that 1QF has stopped working; the normally open contact S8 is closed, which can bridge the normally closed contact KA1-1 and the 3rd and 4th nodes of SA, without affecting the on-site closing and debugging inspection of 1QF; the normally open point S1 is connected in series before the closing coil HQ, and S1 is closed when the energy storage mechanism is in place, and S1 is disconnected when the energy storage mechanism is not in place, which plays a role in protecting the closing mechanism; when 1QF is in the closed state, the normally closed contact 1QF-2 is disconnected to prevent the closing coil from being energized for a long time.

[0041] Function of the opening misoperation control part: When 1QF is in the closed state, the normally open contact 1QF-4 is closed, and if any one of the second contacts of QF is in the closed state, KA2 is energized and operates, disconnecting the opening circuit through the normally closed contact KA2-1 to limit the opening of 1QF; at the same time, the normally open contact KA2-2 is closed and 2HR is connected to warn the operator to avoid misoperation of opening with load.

[0042] Taking into account that 1QF may need emergency tripping operation under special circumstances, KA2-1 and 2LP connected in series in the tripping circuit of the incoming cabinet can be switched on and off according to on-site requirements; when 2LP is disconnected, the tripping erroneous operation control will be activated; when 2LP is connected, the tripping erroneous operation control will be released; when the tripping alarm is activated, 2SB should be placed in the on position; when the tripping alarm is not required, 2SB should be placed in the off position.

[0043] When 1QF is in the closed state and the second contacts of QF are all in the open state, KA2 will not be energized, the normally closed contact KA2-1 will be closed, and the normal opening operation will not be affected; the normally closed contact KA2-3 will be closed, and the opening permission warning light 3HR will light up, indicating the opening permission signal.

[0044] When 1QF is in the open state, the normally open contact 1QF-3 disconnects the opening circuit to prevent the opening coil from being energized for a long time; when 1QF is in the open state, 1QF-4 is disconnected, KA2 is not energized, and the opening control does not work, which will not affect normal operation.

[0045] It should be noted that the tripping erroneous operation circuit only limits the tripping operation, does not include the high-voltage protection device and process control tripping part, and will not affect the normal use of the protection device and process control tripping.

[0046] Working principle:

[0047] Signal acquisition of closing error operation acquisition circuit:

[0048] The load circuit breaker QF is used to connect external motors, transformers and other equipment; the first normally open contacts QF1-1, QF2-1, and QFN-1 of all QFs are connected in parallel to collect the working status of the on-site load circuit breakers. When the normally open contacts of several QFN-1s are disconnected, it indicates that they are in the open stop state; when their normally open contacts are closed, it indicates that they are in the closed operating state; when the normally open contacts of all QFN-1s are disconnected, it indicates that all loads are in the shutdown state and the parallel circuit is not connected; the intermediate relay coil KA1 will not be energized and operated.

[0049] The working status of 1QF is collected by using the normally closed contact 1QF-1 of the incoming circuit breaker 1QF. When its normally closed contact is closed, it indicates that it is in the open state, and when its normally closed contact is disconnected, it indicates that it is in the closed state. When the normally closed contact 1QF-1 of 1QF is disconnected, it is in the closed state, and there is no need to perform closing error operation control, and the signal collection circuit is not connected. When the normally closed contact 1QF-1 of 1QF is closed, it indicates that it is in the open state, and the closing error operation control is meaningful at this time.

[0050] When the normally closed contact 1QF-1 of 1QF is closed, it indicates that it is in the open state and the signal acquisition circuit is connected to work; when all loads are in the shutdown state, the parallel circuit is not connected; at this time, KA1 is not energized, and the normally closed contact KA1-1 of KA1 connected in series in the closing circuit is closed, and there is no restriction on closing; when the normally closed contact 1QF-1 of 1QF is closed, any one of QFN-1 is in the closed state, and its parallel circuit will be connected, driving KA1 to be energized and operate, and the incoming line closing circuit is disconnected through the action of KA1's normally closed contact KA1-1 to limit the closing of the incoming line switch with on-site loads to avoid the occurrence of misoperation.

[0051] Closing error operation circuit:

[0052] The necessary conditions for connecting the 1QF closing circuit include:

[0053] 1. When the energy storage mechanism of 1QF completes energy storage, the normally open point S1 of 1QF is closed; when the energy storage mechanism does not store energy, the normally open point S1 is disconnected and the closing circuit cannot be connected;

[0054] 2. 1QF is in the open state, and the normally closed point 1QF-2 of 1QF is closed;

[0055] 3. Put the closing error operation control into use by disconnecting the control pressure plate 1LP of the incoming line closing error operation. When KA1 of the closing error operation acquisition circuit does not operate, its normally closed contact KA1-1 is in a closed state, and the closing operation of 1QF is not restricted; when any of the first contacts of QF is in a closed state, its parallel circuit will be connected, driving KA1 to be energized and operate, and the closing error operation circuit will be disconnected through the action of KA1's normally closed contact KA1-1 to restrict 1QF from closing with load QFN-1 and avoid the occurrence of error operation;

[0056] 4. When 1QF is in the test position, since the main circuit is not energized, the normally open contact S8 of the 1QF test position is closed, and the 1QF can be directly opened and closed through the opening and closing switch KK; it is not restricted by the normally closed contact KA1-1 of the transfer switch SA and KA1;

[0057] 5. When 1QF is in the working position, the normally open contact S9 of the 1QF working position is closed. The closing of 1QF can be restricted by disconnecting 1LP and KA1-1 to avoid erroneous operation of closing with load.

[0058] Closing alarm circuit:

[0059] When the knob switch 1SB is selected to the on position, the alarm circuit is put into use. When KA1 is activated and its normally open contact KA1-2 is attracted, the alarm circuit is connected, the warning light 1HR and the alarm bell DL are activated, and an alarm is sounded.

[0060] Tripping error operation collection circuit:

[0061] The second normally open contacts QF1-2, QF2-2, and QFN-2 of all load circuit breakers QF are connected in parallel to collect the working status of the on-site QF. When its normally open contact is disconnected, it indicates that it is in the open stop state; when its normally open contact is closed, it indicates that it is in the closed operation state; when the second normally open contacts of all QFs are disconnected, it indicates that all loads are in the shutdown state, and the parallel circuit will not be connected; the corresponding intermediate relay KA2 will not be energized and acted;

[0062] The working status of 1QF is collected by using the normally open contact 1QF-4 of 1QF. When 1QF-4 is disconnected, it indicates that it is in the open state, and when 1QF-4 is closed, it indicates that 1QF is in the closed state. When 1QF-4 is disconnected, 1QF is in the open state, and there is no need to perform the opening misoperation control, and the signal collection circuit will not be connected. When 1QF-4 is closed, it indicates that it is in the closed state, and the opening misoperation control is meaningful at this time.

[0063] When 1QF-4 is closed, it indicates that it is in the closed state, and the signal acquisition circuit is connected to work; when all QFN-2 are in the shutdown state, the parallel circuit will not be connected; at this time, KA2 will not be energized, and the normally closed contact KA2-1 of KA2 will be closed, and the opening will not be restricted; when 1QF-4 is closed, any one of QFN-2 is in the closed state, and its parallel circuit will be connected, driving KA2 to be energized and operate, and the incoming line opening circuit will be disconnected through the action of KA2's normally closed contact KA2-1, so as to limit the opening of 1QF with QFN-2 and avoid the occurrence of misoperation.

[0064] Opening error operation circuit:

[0065] Disconnect the control pressure plate 2LP, and the opening erroneous operation is put into use; when KA2 is energized, the normally closed contact KA2-1 of KA2 will operate to disconnect the opening circuit of the incoming circuit breaker to limit the occurrence of erroneous operation of opening with load. The control pressure plate 3LP controls the opening function of the protection device. When 3LP is disconnected, the opening function of the protection device is withdrawn, and when 3LP is connected, the opening function of the protection device is put into use.

[0066] Opening alarm circuit:

[0067] When the knob switch 2SB is placed in the on position, the alarm circuit is put into use; when KA2 is not energized, the normally closed contact KA2-3 of KA2 connects the warning light 3HR that allows opening; the normally open contact KA2-2 of KA2 disconnects the warning light 2HR that prohibits opening; when KA2 is energized and actuated, the normally closed contact KA2-3 of KA2 disconnects, and the warning light 3HR that allows opening does not light up; the normally open contact KA2-2 of KA2 actuates and connects the warning light 2HR that prohibits opening, and the warning light 2HR that prohibits opening lights up, sending out an alarm signal.

[0068] like Figure 3 As shown in the figure, the closing error operation restriction must be in effect when the incoming line closing error operation control pressure plate is open, the incoming line switch circuit breaker is in the open state, and the incoming line switch normally closed contact 1QF1-1 is closed. At this time, if any load switch circuit breaker is in the closed state, the closing error operation control will play a role, limiting the incoming line switch from closing with load to avoid the incoming line closing error operation.

[0069] like Figure 4 As shown in the figure, the conditions for the opening error operation restriction must be that the incoming line opening error operation control pressure plate is open, the incoming line switch circuit breaker is in the closed state, and the incoming line switch normally closed contact 1QF1-4 is closed. At this time, if any load switch circuit breaker is in the closed state, the opening error operation control will play a role, limiting the incoming line switch from opening with load to avoid the incoming line opening error operation.

[0070] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A control circuit for preventing misoperation of high voltage incoming line, characterized in that: include: Closing error operation collection circuit, closing error operation circuit, opening error operation collection circuit and opening error operation circuit; Among them, The closing misoperation acquisition circuit is used to obtain the opening and closing state signals of the incoming circuit breaker and the load circuit breaker, so as to judge the action of the first intermediate relay; The closing misoperation circuit determines whether to connect or disconnect the closing circuit according to the state signal of the first intermediate relay; The opening fault operation acquisition circuit is used to obtain the opening and closing state signals of the incoming circuit breaker and the load circuit breaker, and judge the action of the second intermediate relay through signal comparison. The opening fault operation circuit determines whether to connect or disconnect the opening circuit according to the state signal of the second intermediate relay.

2. The high voltage incoming line misoperation prevention control circuit according to claim 1, characterized in that: The closing error operation collection circuit includes: several load circuit breakers QF1 to QFN, the normally closed contact 1QF-1 of the incoming circuit breaker 1QF, and the intermediate relay KA1. The first normally open contacts of the load circuit breakers QF1 to QFN are connected in parallel, and the right end is connected to the left end of the normally closed contact 1QF-1, and the right end of 1QF-1 is connected to the left end of KA1.

3. The high voltage incoming line misoperation prevention control circuit according to claim 2, characterized in that: The closing misoperation circuit includes: normally open contact S8, normally open contact S9, normally closed contact KA1-1, control pressure plate 1LP, the 3rd and 4th nodes of transfer switch SA, the 1st and 2nd nodes of SA, the 1st and 2nd nodes of opening and closing switch KK, the normally closed point 1QF-2 of the incoming circuit breaker, normally open point S1 and closing coil HQ; the right end of S8 is connected to the common end of the 4th node of SA and the 1st node of KK; the right end of S9 is connected to the left end of KA1-1 and the left end of 1LP respectively, the right common end of 1LP and KA1-1 is connected to the 3rd node of SA and the 1st node of SA respectively, the 2nd node of SA is connected to the 2nd node of KK and the left common end of 1QF-2, the right end of 1QF-2 is connected to the left end of S1, and the right end of S1 is connected to the left end of HQ.

4. The high voltage incoming line misoperation prevention control circuit according to claim 3, characterized in that: The circuit for collecting the faulty opening operation includes: several load circuit breakers QF1 to QFN, the normally open contact 1QF-4 of the incoming circuit breaker 1QF, and the intermediate relay KA2. The right end of the second normally open contacts of the load circuit breakers QF1 to QFN are connected in parallel and connected to the left end of the normally open contact 1QF-4, and the right end of 1QF-4 is connected to the left end of KA2.

5. The high voltage incoming line misoperation prevention control circuit according to claim 4, characterized in that: The opening misoperation circuit includes: normally closed contact KA2-1, control pressure plates 2LP, 3LP, the 5th and 6th nodes of transfer switch SA, the 3rd and 4th nodes of opening and closing switch KK, the normally open point 1QF-3 of incoming circuit breaker 1QF and opening coil TQ; the left end of KA2-1 is connected to the left end of 2LP and 3LP respectively, and the right end of KA2-1 is connected to the right end of 2LP, the 3rd node of KK and the 5th node of SA; the 6th node of SA is connected to the 4th node of KK, the right end of 3LP and the left end of 1QF-3 respectively, and the right end of 1QF-3 is connected to the left end of TQ.

6. The high voltage incoming line misoperation prevention control circuit according to claim 1, characterized in that: Also includes: The closing alarm circuit is electrically connected to the closing erroneous operation circuit.

7. The high voltage incoming line misoperation prevention control circuit according to claim 6, characterized in that: The closing alarm circuit includes: knob switch 1SB, normally open contact KA1-2 of KA1, warning light 1HR and alarm bell DL. The right end of 1SB is connected to the left end of KA1-2, the right end of KA1-2 is connected to the left ends of 1HR and DL respectively, and the right end of 1HR is connected to the right end of DL.

8. The high voltage incoming line misoperation prevention control circuit according to claim 1, characterized in that: Also includes: The opening alarm circuit is electrically connected to the opening misoperation circuit.

9. The high voltage incoming line misoperation prevention control circuit according to claim 8, characterized in that: The trip alarm circuit includes: knob switch 2SB, KA2's normally open contact KA2-2, KA2's normally closed contact KA2-3, warning lights 2HR and 3HR. The right end of 2SB is connected to the left ends of KA2-2 and KA2-3 respectively, the right end of KA2-2 is connected to the left end of 2HR, the right end of KA2-3 is connected to the left end of 3HR, and the right end of 2HR is connected to the right end of 3HR.

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