CN112653183A - Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid - Google Patents
Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid Download PDFInfo
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Abstract
The invention discloses a centralized switching control method and a centralized switching control system for a plurality of transformer blocking devices of a power plant or a power grid, wherein the method comprises the following steps: s1, receiving operation parameter signals transmitted by N units in real time; s2, judging whether any direct current signal exceeds a current threshold value, and if so, outputting a simultaneous casting instruction; if not, go to S3; s3, judging whether the current sum of all the direct current signals exceeds a total threshold value, and if so, outputting a partial switching instruction; if not, go to S4; s4, judging whether each direct current signal in the N operation parameter signals is lower than a synchronous quit safety threshold value or not, and if so, outputting a synchronous quit instruction; if not, outputting a part of the throwing and withdrawing instruction. In the centralized switching control system and method for the multiple transformer stopping devices of the power plant or the power grid, the monitoring host judges according to the operating parameter signals of the units and outputs the simultaneous switching instruction, the partial switching instruction and the simultaneous switching instruction under different conditions, so that the function of a remote centralized control mechanism of the multiple units is realized.
Description
Technical Field
The invention relates to the field of main transformers of power transmission systems, in particular to a centralized switching control system and method for multiple transformer blocking devices of a power plant or a power grid.
Background
In recent years, high-voltage direct-current transmission systems are developed in the east transmission of western electricity and the south transmission of north electricity in China. When the single-stage ground return wire of the direct current transmission of the converter station runs, the existence of the direct current bias current can not only cause the serious magnetic saturation of the iron core of the transformer, increase the loss of metal components of the transformer, cause the local overheating phenomenon, damage the insulation and reduce the service life of the transformer; and the problems of excitation current distortion, harmonic generation, increase of transformer reactive power consumption, reduction of system voltage and the like are caused, the safe and stable operation of the system is influenced, and corresponding measures are required to be taken for inhibiting. The mode of connecting the capacitor in series at the neutral point of the main transformer is adopted for blocking, the direct current magnetic biasing problem of the transformer is effectively solved, the treatment effect is obvious and economic, and hundreds of direct current blocking devices are accumulated in the operation at home at present.
However, with the large-scale operation of the transformer neutral point direct current suppression device, a corresponding new problem is also generated. In the power plant, a plurality of main transformers are provided with DC blocking devices to operate in parallel, under the single-pole ground loop operation mode of a converter station, along with the gradual increase of direct current injected into the ground by an earth electrode, when stray direct current flowing through a neutral point of a transformer reaches a set value and starts the DC blocking devices to operate in DC blocking, due to the asynchronism of the actions of the DC blocking devices, some DC blocking devices are in a capacitance grounding state, and other DC blocking devices are in a direct grounding state. The occurrence of the condition will inevitably cause the direct current of the main transformer neutral point which does not enter the blocking state to be increased sharply, and bring great influence to the safe operation of the transformer.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an improved centralized switching control system and method for multiple blocking devices of a power plant or a power grid, aiming at the defects, the remote centralized control and operation of the multiple blocking devices are realized by adding external technical means and control logic, and a linkage mechanism for synchronously switching into a blocking state and synchronously switching out of the blocking state is realized.
The technical scheme adopted by the invention for solving the technical problems is as follows: the centralized switching control method for the plurality of transformer stopping devices of the power plant or the power grid comprises the following steps:
s1, receiving operation parameter signals transmitted by all N units in real time, wherein the operation parameter signals comprise direct current signals;
s2, judging whether any one direct current signal in the N operation parameter signals exceeds a current threshold value, and if so, outputting a simultaneous operation instruction; if not, go to step S3;
s3, judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value or not, and if so, outputting a part of switching-on/off instructions; if not, go to step S4;
s4, judging whether each direct current signal in the N operation parameter signals is lower than a synchronous quit safety threshold value or not, and if so, outputting a synchronous quit instruction; if not, outputting the part of the throwing and withdrawing instruction.
Preferably, the method further includes a step S0. of determining whether the state position condition included in the N operation parameter signals is an automatic state, and if so, the synchronous linkage control mechanism of the corresponding unit is effective; and if not, the remote or local state is determined, and the corresponding synchronous linkage control mechanism of the unit is invalid.
Preferably, the method further includes step S5, after the co-operation instruction or the co-exit instruction is output, whether each unit is successfully operated or successfully exited is determined, and if yes, the method returns to step S1; if not, outputting an input abnormal alarm signal or an exit abnormal alarm signal.
Preferably, the method further includes step S6, after the partial putting-quit instruction is output, whether the corresponding unit is put into the unit successfully or quit successfully is judged, and if yes, the method returns to the step S1; if not, outputting an input abnormal alarm signal or an exit abnormal alarm signal.
Preferably, the method further comprises step S7 of judging whether the communication of each unit is normal in real time according to the operation parameter signal, and if so, returning to step S1; if not, outputting a communication abnormity alarm signal.
The centralized switching control system comprises a monitoring host, a unit and a switch for transmitting signals between the monitoring host and the unit, wherein the unit comprises a transformer, a blocking device for controlling the transformer and a controller for controlling the blocking device; the monitoring host comprises
The transmission module is used for receiving operation parameter signals transmitted by all the N units in real time, wherein the operation parameter signals comprise direct current signals;
the simultaneous switching judging module is used for judging whether any direct current signal exceeds a current threshold value in the N operation parameter signals and selectively outputting a simultaneous switching judging result, wherein the simultaneous switching judging result comprises a simultaneous switching instruction;
the partial switching judging module is used for selectively judging whether the current sum of all the direct current signals in the N running parameter signals exceeds a total threshold value according to the simultaneous switching judging result and selectively outputting a partial switching judging result, wherein the partial switching judging result comprises a partial switching instruction;
and the synchronous-quit judging module is used for selectively judging whether each direct current signal is lower than a synchronous-quit safety threshold value in the N running parameter signals according to the partial switching-in/out judging result and selectively outputting a synchronous-quit judging result, wherein the synchronous-quit judging result comprises a synchronous-quit instruction.
Preferably, the monitoring host further includes a linkage determination module, configured to determine whether a state position condition included in the N operation parameter signals is an automatic state, and if so, the corresponding synchronous linkage control mechanism of the unit is valid; and if not, the remote or local state is determined, and the corresponding synchronous linkage control mechanism of the unit is invalid.
Preferably, the monitoring host further includes a simultaneous operation and retreat warning module, configured to determine whether each unit is successfully operated or successfully retreated after the simultaneous operation instruction or the retreat instruction is output, and selectively output an abnormal operation warning signal or an abnormal retreat warning signal.
Preferably, the monitoring host further includes a partial trip alarm module, configured to determine whether the corresponding unit is successfully tripped or successfully tripped after outputting the partial trip command, and selectively output a trip-in abnormal alarm signal or a trip-out abnormal alarm signal.
Preferably, the monitoring host further comprises a communication alarm module, which is used for judging whether the communication of each unit is normal in real time according to the operation parameter signal and selectively outputting a communication abnormal alarm signal.
The beneficial effects of the implementation of the invention are as follows: in the centralized switching control system and method for the multiple transformer stopping devices of the power plant or the power grid, the monitoring host judges according to the operating parameter signals of the units and outputs the simultaneous switching instructions, partial switching instructions and simultaneous switching instructions under different conditions, so that the function of a remote centralized control mechanism of the multiple units is realized, and the influence on the safe and stable operation of the system due to the fact that a certain transformer or transformers are influenced too much by direct current magnetic biasing and even damaged is avoided.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a centralized commissioning and decommissioning control system for a plurality of transformer blocking devices of a power plant or a power grid according to some embodiments of the present invention;
FIG. 2 is a schematic diagram of the monitoring host of FIG. 1;
fig. 3 is a schematic flow chart of a method for controlling centralized operation and retreat of a plurality of transformer blocking devices in a power plant or a power grid according to some embodiments of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 illustrates a centralized commissioning and decommissioning control system for multiple transformer dc blocking devices of a power plant or a power grid, which is used for remotely and centrally controlling multiple units 30 according to some embodiments of the present invention. The centralized switching control system for the multiple transformer stopping devices of the power plant or the power grid in the embodiment of the invention comprises a monitoring host 10, an exchanger 20 and N machine sets 30, wherein the monitoring host 10 is communicated with the N machine sets 30 through the exchanger 20 and centrally controls the switching conditions of the N machine sets 30.
Wherein the switch 20 is used for transmitting signals between the monitoring host 10 and the aggregate 30, preferably, the switch 20 uses an optical fiber connection.
The number of the machine sets 30 is N, and the machine sets can be set according to specific requirements. Each group of units 30 comprises a transformer 33, a dc blocking device 32 for controlling the transformer 33 and a controller 31 for controlling the dc blocking device 32.
Among them, the controller 31 is preferably an MCU. The controller 31 is provided with a synchronous linkage control mechanism, under which the controller 31 only starts to operate the request signal, i.e. the operation parameter signal, but does not operate the device outlet. Time control, constant capacitor throw, constant value control, remote control and local control, and logic judgment of stopping throw or stopping throw in other operation modes is kept unchanged.
When the transformer 33 in a certain unit 30 is in maintenance or standby, the monitoring host 10 is realized not to participate in the synchronous linkage control mechanism, namely, in an independent mode, through software or hardware control logic. The blocking device 32 is used for preventing the machine set 30 which is under maintenance or standby from being linked to other machine sets 30 when the machine set 30 is put into or taken out; the blocking devices 32 of the other units 30 are not linked to the blocking device 32 of the unit 30.
As shown in fig. 1 and 2, the monitoring host 10 is used to centrally control the operation and the retreat of each unit 30. The monitoring host 10 is responsible for managing the coordinated synchronous commissioning and decommissioning functions. The monitoring host 10 and the controller 31 of each unit 30 communicate data via the network of the switch 20.
The monitoring host 10 comprises a transmission module 11, a simultaneous-casting judgment module 12, a partial-casting judgment module 13, a simultaneous-retreating judgment module 14, a linkage judgment module 15, a simultaneous-casting and simultaneous-retreating alarm module 16, a partial-casting and retreating alarm module 17 and a communication alarm module 18.
The transmission module 11 is configured to receive, in real time, the operation parameter signals transmitted by all the N units 30, where the operation parameter signals include direct current signals. In the automatic control mode, assuming that each on-site blocking device 32 is in a direct grounding state, when any one or more on-site blocking devices 32 logically judge that the blocking input condition is met, the controller 31 sends a request, i.e., an operation parameter signal, to the transmission module 11 of the monitoring host 10, the monitoring host 10 sends a blocking input command or a blocking exit command, and the controller 31 of each blocking device 32 executes the blocking input operation command.
The simultaneous-casting judgment module 12 is configured to judge whether any one of the N operation parameter signals exceeds a current threshold, and selectively output a simultaneous-casting judgment result, where the simultaneous-casting judgment result includes a simultaneous-casting instruction. The partial switching judging module 13 is configured to selectively judge whether a current sum of all the direct current signals exceeds a total threshold value in the N operation parameter signals according to a simultaneous switching judging result, and selectively output a partial switching judging result, where the partial switching judging result includes a partial switching instruction.
The co-quit judging module 14 is configured to selectively judge whether each of the N operating parameter signals is lower than a co-quit safety threshold according to a partial on-quit judgment result, and selectively output a co-quit judgment result, where the co-quit judgment result includes a co-quit instruction.
Each blocking device 32 is under the synchronous linkage control mechanism of capacitor blocking, when the controller 31 of the blocking device 32 logically judges that the blocking exit condition is met, the operation parameter signal sent to the monitoring host 10 includes a blocking exit state request, and the monitoring host 10 sends a blocking exit execution command to all the blocking devices 32 only when receiving the blocking exit requests of all the blocking devices 32, and all the blocking devices 32 exit to the direct grounding state.
In some embodiments, the monitoring host 10 further includes a linkage determination module 15. The linkage judgment module 15 is configured to judge whether a state position condition included in the N operation parameter signals is an automatic state, and if so, the synchronous linkage control mechanism of the corresponding unit 30 is effective; if not, the remote or local state is determined, the synchronous linkage control mechanism of the corresponding unit 30 is invalid.
Specifically, in the synchronous linkage control mechanism mode, the linkage determining module 15 needs to determine the device status position signals of the respective controllers 31: remote/automatic/local. And, the synchronous interlock control mechanism is effective only when the blocking device 32 is in automatic control. The synchronous linkage control mechanism can be executed only when the communication between the monitoring host 10 and the controller 31 is normal, an alarm is given when the communication is abnormal, and the blocking device 32 exits the synchronous linkage control mechanism.
In the automatic control mode, it is assumed that each of the on-site blocking devices 32 is in a direct grounding state, and when logically judging that the blocking input condition is met, any one or more on-site blocking devices 32 send a request to the monitoring host 10, the monitoring host 10 sends a blocking input command, and the controller 31 of each of the blocking devices 32 executes the blocking input operation command.
The blocking devices 32 are under the direct grounding synchronous linkage control mechanism, and when receiving a linkage input command issued by the monitoring host 10, each blocking device 32 unconditionally enters a blocking capacitor grounding input state.
Special conditions are also included in some embodiments: when the dc blocking device 32 is in the simultaneous switching state, if a certain dc blocking device 32 itself is forced to exit due to a fault, the equipment body protection state switch directly bypasses the dc blocking, and at this time, in order to prevent the transformer exiting the dc blocking from bearing a large dc current, the simultaneous switching device will quickly calculate the sum of the dc currents of the plurality of transformers being switched, and make a simultaneous switching instruction when the sum of the dc currents exceeds a threshold value. And this instruction must be executed earlier than the faulty device protection action time.
Under the condition that the protection logic of the local equipment body is not changed, the monitoring host 10 performs protection operation prior to the equipment body. If the sum of the direct currents does not exceed the threshold value, the local change-over switch acts to bypass the fault capacitor device, and the monitoring host 10 continuously and closely monitors the total value of the direct currents until the fault of the fault capacitor device is eliminated and the fault capacitor device is put into operation again.
In some embodiments, the monitoring host 10 also includes a co-casting and fallback alert module 16. The simultaneous operation and retreat warning module 16 is configured to determine whether each unit 30 is successfully operated or retreated after outputting the simultaneous operation command or the retreat command, and selectively output an operation abnormality warning signal or an retreat abnormality warning signal.
If the monitoring host 10 detects that one or more blocking devices 32 fail to be put into blocking in a delayed manner, the monitoring host 10 needs to send a blocking exit instruction, the inserted blocking devices 32 should immediately exit blocking, and simultaneously, the blocking input function of the blocking devices 32 is locked, and an alarm signal is sent to wait for manual intervention. Similarly, when the blocking devices 32 are in the blocking state of the capacitor, and the blocking devices 32 are in the blocking state during linkage exit execution, the monitoring host 10 monitors that one or more blocking devices 32 still are in the blocking state after the exit failure of the blocking devices 32 is delayed, and the linked exit equipment is put into operation again, and sends an alarm signal to wait for manual intervention.
In some embodiments, the monitoring host 10 further includes a partial fallback alarm module 17. The partial putting-in/out alarm module 17 is configured to determine whether the corresponding unit 30 is successfully put in or successfully quit after outputting the partial putting-in/out instruction, and selectively output an input abnormality alarm signal or an exit abnormality alarm signal.
In some embodiments, the monitoring host 10 further includes a communication alarm module 18. The communication alarm module 18 is configured to determine whether each unit 30 is in normal communication in real time according to the operation parameter signal, and selectively output a communication abnormality alarm signal.
The reliability of the communication between the monitoring host 10 and the blocking device 32 is monitored in real time through "heartbeat" and real-time data transmission and response, so as to ensure that the stable operation of each blocking device 32, the switch 20 and the monitoring host 10 participating in linkage is in a known state. And outputting a fault alarm when the communication is abnormal.
In some embodiments, the centralized switching control system for the plurality of transformer blocking devices in the power plant or the power grid can be modified on the basis of the existing control scheme. Preferably, the following modifications are made:
the monitoring host 10 is added in data communication with the controller 31 of each dc blocking device 32. The functions of the independent background machines of the currently running blocking devices 32 can be replaced by the monitoring host 10, and the currently running background host can be removed, so that the centralized management control of the equipment is realized.
The controller 31 of the existing operation blocking device 32 is replaced, and functions related to a linkage mechanism and a network communication interface are implanted.
And adding each blocking device 32 to the optical fiber communication of the monitoring host 10, and adding network optical fiber communication equipment at two ends.
Each dc blocking device 32 adds a GPS/beidou clock synchronization function.
A new blocking device 32 background host screen cabinet is added.
The new controller 31 is adopted to replace the original old controller and the wave recording unit, and meanwhile, the existing background master station in the station is upgraded.
Compared with the prior art and the like, the technical scheme in the embodiment of the invention has the advantages that:
(1) the remote unified control and operation of a plurality of main transformer DC blocking devices in one base can be realized, the field one-by-one single operation mode is reduced, and the problem of simultaneous operation of the plurality of DC blocking devices 32 in a plurality of power stations is solved;
(2) under the condition that a plurality of DC blocking devices 32 independently operate in actual operation, synchronous input and synchronous exit of the plurality of DC blocking devices 32 can be realized through remote operation, and the phenomenon that a part of DC blocking devices 32 are in a capacitance grounding state and the other part of DC blocking devices 32 are in a direct grounding state due to the asynchronism of actions of the DC blocking devices 32 in an automatic mode is avoided, so that the direct current of a main transformer neutral point which does not enter the DC blocking state is sharply increased, and a large risk is brought to the safe operation of a main transformer 33;
(3) the control method and the logic structure are clear, the control mode is simple, the operation is easy, the installation is convenient, the maintenance is convenient, and the cost is lower;
(4) the practicability is strong, the protection effect after the blocking is added to the neutral points of the plurality of transformers 33 is obvious, the method is not only suitable for nuclear power stations, but also suitable for controlling and operating the neutral point blocking devices 32 of the transformers 33 of each power station of a power grid, the unified on-off monitoring and operation can be realized through one main monitoring station, and the operation and maintenance investment can be saved to the maximum extent while the reliability of the transformers 33 is improved.
The control principle of the centralized putting-in and putting-out control system for the multiple transformer blocking devices of the power plant or the power grid in the embodiments is described below with reference to fig. 1 to 3 and specific steps of the centralized putting-in and putting-out control method for the multiple transformer blocking devices of the power plant or the power grid in some embodiments of the invention. In the embodiment of the invention, the centralized switching control method for the plurality of transformer stopping devices of the power plant or the power grid comprises the steps of S0-S7.
S0., judging whether the state position condition included in the N operation parameter signals is an automatic state, if so, the synchronous linkage control mechanism of the corresponding unit 30 is effective; if not, the remote or local state is determined, the synchronous linkage control mechanism of the corresponding unit 30 is invalid.
S1, receiving operation parameter signals transmitted by all the N units 30 in real time, wherein the operation parameter signals comprise direct current signals.
S2, judging whether any direct current signal in the N operation parameter signals exceeds a current threshold value, and if so, outputting a simultaneous operation instruction; if not, step S3 is executed.
S3, judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value, if so, outputting a part of switching-on/off instructions; if not, step S4 is executed.
S4, judging whether each direct current signal in the N operation parameter signals is lower than a synchronous quit safety threshold value or not, and if so, outputting a synchronous quit instruction; if not, outputting a part of the throwing and withdrawing instruction.
S5, after the synchronous input instruction or the synchronous quit instruction is output, whether each unit 30 is successfully input or quit is judged, if yes, the step S1 is returned; if not, outputting an input abnormal alarm signal or an exit abnormal alarm signal.
S6, after the output part of the switching instructions, judging whether the corresponding unit 30 is successfully switched in or successfully switched out, if so, returning to the step S1; if not, outputting an input abnormal alarm signal or an exit abnormal alarm signal.
S7, judging whether each unit 30 is in normal communication in real time according to the operation parameter signals, and if so, returning to the step S1; if not, outputting a communication abnormity alarm signal.
The centralized switching control method for the multiple transformer stopping devices of the power plant or the power grid in the embodiment is consistent with the centralized switching control system for the multiple transformer stopping devices of the power plant or the power grid in the embodiment, and details are not repeated here.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.
Claims (10)
1. A centralized switching control method for a plurality of transformer stopping devices of a power plant or a power grid is characterized by comprising the following steps:
s1, receiving operation parameter signals transmitted by all N units (30) in real time, wherein the operation parameter signals comprise direct current signals;
s2, judging whether any one direct current signal in the N operation parameter signals exceeds a current threshold value, and if so, outputting a simultaneous operation instruction; if not, go to step S3;
s3, judging whether the current sum of all the direct current signals in the N operation parameter signals exceeds a total threshold value or not, and if so, outputting a part of switching-on/off instructions; if not, go to step S4;
s4, judging whether each direct current signal in the N operation parameter signals is lower than a synchronous quit safety threshold value or not, and if so, outputting a synchronous quit instruction; if not, outputting the part of the throwing and withdrawing instruction.
2. The method for controlling the centralized operation and retreat of the multiple transformer stopping devices of the power plant or the power grid according to claim 1, further comprising a step S0. of judging whether the state position conditions included in the N operating parameter signals are automatic states, if so, the corresponding synchronous linkage control mechanism of the unit (30) is effective; if not, the remote or local state is determined, the synchronous linkage control mechanism of the corresponding unit (30) is invalid.
3. The centralized putting-in and putting-out control method for the multiple transformer stopping devices of the power plant or the power grid according to claim 1 or 2, characterized by further comprising a step S5 of judging whether each unit (30) is successfully put in or successfully put out after the simultaneous putting-in command or the simultaneous putting-out command is output, and if so, returning to the step S1; if not, outputting an input abnormal alarm signal or an exit abnormal alarm signal.
4. The centralized putting-in and putting-out control method for the multiple transformer stopping devices of the power plant or the power grid according to claim 1 or 2, characterized by further comprising a step S6 of judging whether the corresponding unit (30) is put in successfully or is put out successfully after outputting the partial putting-in and putting-out instruction, and if so, returning to the step S1; if not, outputting an input abnormal alarm signal or an exit abnormal alarm signal.
5. The centralized putting-in and putting-out control method for the multiple transformer stopping devices of the power plant or the power grid according to claim 1 or 2, characterized by further comprising a step S7 of judging whether each unit (30) is normally communicated in real time according to the operation parameter signal, and if so, returning to the step S1; if not, outputting a communication abnormity alarm signal.
6. A centralized switching control system for multiple transformer blocking devices in a power plant or a power grid is characterized by comprising a monitoring host (10), a unit (30) and a switch (20) for transmitting signals between the monitoring host (10) and the unit (30), wherein the unit (30) comprises a transformer (33), a blocking device (32) for controlling the transformer (33) and a controller (31) for controlling the blocking device (32); the monitoring host (10) comprises
The transmission module (11) is used for receiving operation parameter signals transmitted by all the N units (30) in real time, wherein the operation parameter signals comprise direct current signals;
the simultaneous switching judging module (12) is used for judging whether any direct current signal exceeds a current threshold value in the N operation parameter signals and selectively outputting a simultaneous switching judging result, wherein the simultaneous switching judging result comprises a simultaneous switching instruction;
a partial switching judgment module (13) for selectively judging whether the current sum of all the direct current signals exceeds a total threshold value in the N operation parameter signals according to the co-switching judgment result, and selectively outputting a partial switching judgment result, wherein the partial switching judgment result comprises a partial switching instruction;
and the same-quit judging module (14) is used for selectively judging whether each direct current signal is lower than a same-quit safety threshold value in the N running parameter signals according to the partial switching-in/quit judging result and selectively outputting a same-quit judging result, wherein the same-quit judging result comprises a same-quit instruction.
7. The power plant or power grid multiple transformer stopping device centralized commissioning and decommissioning control system according to claim 6, wherein the monitoring host (10) further comprises a linkage judgment module (15) for judging whether state position conditions included in the N operation parameter signals are automatic states, and if so, a synchronous linkage control mechanism of the corresponding unit (30) is effective; if not, the remote or local state is determined, the synchronous linkage control mechanism of the corresponding unit (30) is invalid.
8. The power plant or grid multiple transformer blocking devices centralized switching control system according to claim 6 or 7, wherein the monitoring host (10) further comprises a simultaneous switching and simultaneous exiting alarm module (16) for judging whether each unit (30) is successfully switched in or successfully exited after outputting the simultaneous switching instruction or the simultaneous exiting instruction, and selectively outputting a switching abnormal alarm signal or an exiting abnormal alarm signal.
9. The power plant or grid multiple transformer blocking device centralized switching control system according to claim 6 or 7, wherein the monitoring host (10) further comprises a partial switching alarm module (17) for judging whether the corresponding unit (30) is successfully switched in or successfully switched out after outputting the partial switching instruction, and selectively outputting a switching abnormal alarm signal or a switching abnormal exit alarm signal.
10. The power plant or grid multiple transformer blocking device centralized switching control system according to claim 6 or 7, wherein the monitoring host (10) further comprises a communication alarm module (18) for judging whether each unit (30) is in normal communication in real time according to the operation parameter signal and selectively outputting a communication abnormal alarm signal.
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