CN114487969A - Live debugging method and device for composite grounding system - Google Patents
Live debugging method and device for composite grounding system Download PDFInfo
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Abstract
The invention discloses a method and a device for debugging a composite grounding system in an electrified way, wherein the method comprises the following steps: adjusting the composite grounding system to be in a debugging state; electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil; operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current; and locking the gear of the arc suppression coil corresponding to the second capacitance current, and completing electrification of the composite grounding system. The invention provides a method and a device for live debugging of a composite grounding system, which are used for realizing live debugging of the composite grounding system, reducing the debugging working steps and improving the debugging efficiency.
Description
Technical Field
The embodiment of the invention relates to the technical field of composite grounding systems, in particular to a live debugging method and a live debugging device for a composite grounding system.
Background
The mode of grounding the small resistor in the power supply and distribution system is changed into a flexible grounding mode of connecting the small resistor in parallel with the modulation-following arc suppression coil commonly adopted by power enterprises, and the mode has the problems of limited accuracy of grounding and line selection, limited functions in a station, oscillation compensation and the like during intermittent grounding such as flashover discharge and the like, even induces and expands the accident range, and is not beneficial to safe operation.
The existing composite grounding system integrates the composite grounding technology of low-resistance grounding, arc suppression coil grounding and ungrounded grounding, can be deeply integrated with a relay protection system to realize the global grounding line selection tripping function, and has the problems of time consumption, high workload and the like in the existing debugging method for the composite grounding system.
Disclosure of Invention
The invention provides a method and a device for live debugging of a composite grounding system, which are used for realizing live debugging of the composite grounding system, reducing the debugging working steps and improving the debugging efficiency.
In a first aspect, an embodiment of the present invention provides a method for debugging a composite grounding system in an electrified state, including:
adjusting the composite grounding system to a debugging state;
electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil;
operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current;
and locking the gear of the arc suppression coil corresponding to the second capacitance current, and completing electrification of the composite grounding system.
Optionally, before the primary system of the composite grounding system is powered on and the first capacitive current in the cable line is obtained according to the working gear of the arc suppression coil, the method includes:
adjusting the gear of the arc suppression coil to be the highest gear;
reducing the gears of the arc suppression coil from the highest gear step by step, and detecting the neutral point voltage corresponding to each gear of the arc suppression coil;
and selecting the gear corresponding to the maximum neutral point voltage as the working gear.
Optionally, in the process of detecting the neutral point voltage corresponding to each gear of the arc suppression coil, if the neutral point voltage corresponding to one gear is greater than a preset bus phase voltage, the last gear of the gear is used as the working gear.
Optionally, the secondary system comprises an arc suppression coil controller; operating a secondary system of the compound grounding system, and adjusting the shift of the arc suppression coil to match the second capacitive current with the first capacitive current comprises:
adjusting the gear of the arc suppression coil to the highest gear;
switching off the small-resistance switching circuit breaker, and automatically adjusting the gear of the arc suppression coil by the arc suppression coil controller and measuring the second capacitance current;
and comparing the second capacitance current with the first capacitance current to match the second capacitance current with the first capacitance current.
Optionally, the locking the gear of the arc suppression coil corresponding to the second capacitive current, and the completing of the electrification of the composite grounding system includes:
closing the small-resistance switching circuit breaker;
and locking the gear of the arc suppression coil corresponding to the second capacitance current.
Optionally, adjusting the composite grounding system to a debugging state includes:
power transmission debugging of a secondary system;
and after the secondary system finishes power transmission debugging, performing at least two charging impacts on the grounding transformer.
Optionally, after the power-on of the composite grounding system is completed, the method further includes:
and checking and monitoring the composite grounding system, and detecting the accuracy of grounding and line selection.
In a second aspect, an embodiment of the present invention provides an electrified debugging device for a composite grounding system, including: the device comprises an adjusting module, an obtaining module, an operating module and a locking module;
the adjusting module is used for adjusting the composite grounding system to be in a debugging state;
after the primary system of the composite grounding system is powered on, the acquisition module is used for acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil;
the operation module is used for operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current;
the locking module is used for locking the gear of the arc suppression coil corresponding to the second capacitance current.
Optionally, the composite grounding system live-line debugging device further includes a working gear confirmation module; the working gear confirming module comprises a first adjusting unit, a detecting unit and a confirming unit;
the first adjusting unit is used for adjusting the gear of the arc suppression coil to be the highest gear;
the detection unit is used for reducing the gears of the arc suppression coil from the highest gear to the next gear and detecting the neutral point voltage corresponding to each gear of the arc suppression coil;
the confirming unit is used for selecting the gear corresponding to the maximum neutral point voltage as the working gear.
Optionally, the detection unit is further configured to, in a process of detecting the neutral point voltage corresponding to each shift of the arc suppression coil, if the neutral point voltage corresponding to one shift is greater than a preset bus phase voltage, use a previous shift of the shift as the working shift.
According to the technical scheme provided by the embodiment of the invention, the composite grounding system is adjusted to be in a debugging state, so that the composite grounding system is ensured to be correctly wired, the equipment is safe, and basic preparation is prepared for the subsequent power-on debugging of the composite grounding system. Electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of the arc suppression coil; the secondary system of the composite grounding system is electrified and operated, wherein the small-resistance grounding is required to be disconnected during the electrifying and operating of the secondary system, the gears of the arc suppression coils are adjusted according to a certain rule again, the capacitance current of each gear is measured, the gear of the arc suppression coil corresponding to the second capacitance current which is not much different from the first capacitance current is used as a pre-adjusted gear, when the system is normally operated, the arc suppression coil waits for the pre-adjusted gear, the electrified debugging of the composite grounding system is realized, the debugging working steps are reduced, and the debugging efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a primary system wiring of a composite grounding system according to an embodiment of the present invention.
Fig. 2 is a schematic flowchart of a method for debugging a composite grounding system in a live state according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart for selecting a working gear of an arc suppression coil according to an embodiment of the present invention.
Fig. 4 is a schematic flowchart of another method for debugging a composite grounding system in a live state according to an embodiment of the present invention.
Fig. 5 is a schematic flowchart of another method for debugging a composite grounding system in a live state according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a live-line debugging device of a composite grounding system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing composite grounding system integrates the composite grounding technology of small resistance grounding, arc suppression coil grounding and ungrounded grounding, and can be deeply fused with a relay protection system to realize the global grounding line selection tripping function, fig. 1 is a primary system wiring schematic diagram of the composite grounding system provided by the embodiment of the invention, and is illustrated by taking a 35kV composite grounding system as an example, the neutral point of a grounding transformer TM is respectively connected in parallel and combined into the composite grounding system in a mode of small resistance 1R grounding, arc suppression coil LP grounding and ungrounded grounding, wherein the neutral point is also called zero point, and is a common point of star-shaped wiring in a three-phase or multi-phase alternating current system.
The composite grounding system of the type integrates the advantages of a small resistance grounding mode, an arc suppression coil grounding mode and an ungrounded mode, abandons the defects of the small resistance grounding mode, can be deeply fused with a relay protection system to realize a global grounding line selection tripping function, can be fused with a reactive power filter compensation device function to form a full-frequency domain overvoltage protection structure, and fundamentally solves the problem of 'grounding short circuit' pain points of a power distribution network. The method has the value of being popularized and applied to the field of power supply and distribution. The method can not only quickly stop loss aiming at the ground fault (which can be set within 0.1-10 seconds), but also effectively ensure that important loads in a fault state are supplied with power uninterruptedly (no longer than 2 hours), and can automatically/manually select the point of removing the ground fault aiming at the importance level of the loads, thereby greatly reducing the difficulty of fault emergency management. The successful application of the device is beneficial to the standardization of the neutral point grounding safety equipment, and the intelligent process of the distribution network equipment is powerfully promoted. Aiming at the power transmission debugging of the existing composite grounding system, the existing debugging method of the composite grounding system is incomplete, and the problems of time consumption, large workload and the like exist. The grounding mode of the composite grounding device can be separated, paralleled or (repaired) quit operation along with the state of the main transformer. The composite grounding controller and the arc suppression coil controller can be controlled independently or in a master-slave control mode, and a low-resistance grounding mode is adopted when the system has no grounding fault; switching to an arc extinction grounding mode within 0.1-1S when the ground fault occurs; the fault disappears or the arc extinction operation reaches 2h, and the arc extinction grounding mode is exited; in the arc extinction grounding mode, zero sequence loop current oscillation, abnormal work of an arc extinction coil, and low resistance grounding are thrown again after instructions or grounding faults disappear.
In view of this, fig. 2 is a schematic flow chart of a method for debugging a composite grounding system in an electrified state according to an embodiment of the present invention, where the method is applicable to the situation of debugging the composite grounding system in an electrified state, and the method can be executed by an electrified debugging apparatus of the composite grounding system, and the apparatus can be implemented in a hardware and/or software manner. The method specifically comprises the following steps:
s110, adjusting the composite grounding system to be in a debugging state;
specifically, the debugging state refers to a state in which the composite grounding system can be powered on to start debugging. The process of adjusting to the debugging state comprises equipment wiring inspection, secondary system power-on debugging and the like, wherein the secondary system is an indispensable important component of the power system and comprises secondary equipment, and the secondary equipment is auxiliary equipment for monitoring, measuring, controlling, protecting and adjusting primary equipment in the power system. The secondary equipment is correctly installed and normally functions through the power-on debugging of the secondary equipment, and basic preparation is made for the power-on debugging of a subsequent composite grounding system. Illustratively, a 35kV composite grounding system is taken as an example, wherein the 35kV composite grounding system adopts a composite grounding technology of a pre-controlled small resistor, a pre-adjusted arc suppression coil and no grounding. And (3) checking the composite grounding system before starting, wherein the primary equipment wiring check checks whether the primary equipment wiring is correct and safe according to a system schematic diagram. The secondary equipment wiring check ensures the correctness and reliability of the internal and external wiring. The secondary system is generally a system consisting of relay protection, safety automatic control, system communication, dispatching system and the like. And (4) debugging the whole power transmission of the secondary system and debugging each secondary device. The secondary equipment comprises a small resistance cabinet, a breaker cabinet, a grounding transformer cabinet, an arc suppression coil cabinet and the like. The small resistor cabinet, the circuit breaker cabinet, the grounding transformer cabinet, the arc suppression coil cabinet and the like need to be subjected to power-on debugging respectively, and the functions and the connection of the small resistor cabinet, the circuit breaker cabinet, the grounding transformer cabinet and the arc suppression coil cabinet are detected to be normal, so that the wiring of the composite grounding system is ensured to be correct, the equipment is safe, and basic preparation is prepared for the power-on debugging of the subsequent composite grounding system.
S120, electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil;
specifically, the primary system is a system composed of power generation, power transmission, transformation, power distribution and other equipment such as a generator, a power transmission line, a transformer, a breaker and the like. The function is to step down the electric energy generated by the generator to the distribution system through the transmission and transformation equipment, and then distribute the electric energy to the users through the distribution lines. The primary system is the main body of the power supply system and is a carrier of an electric load, and high voltage or large current is the main characteristic of the primary system. With reference to fig. 1, after the primary system of the composite grounding system is powered on, the operating position of the arc suppression coil LP is adjusted to be the operating position, where the operating position of the arc suppression coil LP is the position corresponding to the neutral point with the maximum voltage, that is, the resonance point. The magnitude of the capacitance current is obtained according to the current of the working gear of the arc suppression coil LP, the capacitance current at the moment is recorded as a first capacitance current, a theoretical capacitance current in a cable circuit can be obtained by substituting a capacitance current calculation formula according to the sectional area of the cable, the voltage grade, the length of the cable, the number of the cable and the like, and if the difference between the first capacitance current and the theoretical capacitance current is not large, the arc suppression coil LP is indicated to be normally powered. If the first capacitance current and the theoretical capacitance current have a large difference, the capacities of the grounding transformer TM and the arc suppression coil LP are required to be sufficient to meet the actual capacitance current value, which may be based on the actually measured first capacitance current.
S130, operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current;
specifically, a secondary system of the composite grounding system is electrified and operated, wherein the small resistor 1R needs to be disconnected for grounding when the secondary system is electrified and operated, the gear of the arc suppression coil LP is adjusted according to a certain rule again, the capacitance current of each gear is measured, the second capacitance current of the composite grounding system is measured by adjusting the gear of the arc suppression coil LP, and the difference between the measured second capacitance current and the first capacitance current is small.
And S140, locking the gear of the arc suppression coil corresponding to the second capacitance current, and completing electrification of the composite grounding system.
Specifically, the gear of the arc suppression coil LP corresponding to the second capacitance current which is not much different from the first capacitance current is used as a pre-adjustment gear to lock the standby state, the state of the current device can be checked with the background communication and measurement and control screen of the composite grounding system, and the corresponding parameters are normal, which indicates that the power transmission is smoothly completed. Wherein, when the system normally operates, arc suppression coil LP waits for and transfers the gear in advance, and when the single-phase earth fault takes place for the system, arc suppression coil LP compensates, through transferring arc suppression coil in advance, reduces primary equipment components and parts, and simple structure is reliable, and compensation does not rely on secondary power when the trouble takes place.
According to the technical scheme provided by the embodiment of the invention, the composite grounding system is adjusted to be in a debugging state, so that the composite grounding system is ensured to be correctly wired, the equipment is safe, and basic preparation is prepared for the subsequent power-on debugging of the composite grounding system. Electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of the arc suppression coil; the secondary system of the composite grounding system is electrified and operated, wherein the small-resistance grounding is required to be disconnected during the electrifying and operating of the secondary system, the gears of the arc suppression coils are adjusted according to a certain rule again, the capacitance current of each gear is measured, the gear of the arc suppression coil corresponding to the second capacitance current which is not much different from the first capacitance current is used as a pre-adjusted gear, when the system is normally operated, the arc suppression coil waits for the pre-adjusted gear, the electrified debugging of the composite grounding system is realized, the debugging working steps are reduced, and the debugging efficiency is improved.
Fig. 3 is a schematic flow chart for selecting an operating position of an arc suppression coil according to an embodiment of the present invention, and referring to fig. 3, before optionally powering up a primary system of a composite grounding system and acquiring a first capacitive current in a cable line according to the operating position of the arc suppression coil, the method includes:
s310, adjusting the gear of the arc suppression coil to the highest gear;
specifically, the arc suppression coil is an inductance coil with an iron core, and is connected between a neutral point of the transformer and the ground to form an arc suppression coil grounding system. The power transmission line of the power system is grounded through the arc suppression coil, and the power transmission line is one of small-current grounding systems. When the arc suppression coil operates normally, no current passes through the arc suppression coil. When the power grid is struck by lightning or single-phase arc grounding occurs, the potential of a neutral point rises to a phase voltage, at the moment, inductive current flowing through the arc suppression coil and capacitive fault current of the single-phase grounding are mutually offset, so that the fault current is compensated, and the compensated residual current is very small and is not enough to maintain the electric arc, so that the electric arc is automatically extinguished. Thus, the earth fault can be eliminated quickly without causing overvoltage. When the working gear of the arc suppression coil is found before debugging, the gear is adjusted at the highest gear, and the capacity of the arc suppression coil is ensured to be enough to meet the actual capacitance current. For example, referring to fig. 1, the highest shift position of the arc suppression coil LP is the X shift position.
S320, reducing the gears of the arc suppression coil from the highest gear to the next gear, and detecting the neutral point voltage corresponding to each gear of the arc suppression coil;
specifically, referring to fig. 1, the minimum gear of the arc suppression coil LP is gear a, and the arc suppression coil LP may be adjusted from gear X to gear a in a manual or automatic manner, that is, the arc suppression coil LP is reduced from gear X to gear a in a gear-by-gear manner, and the voltage value of the neutral point of the grounding transformer TM is measured in a gear-by-gear manner.
And S330, selecting the gear corresponding to the maximum neutral point voltage as a working gear.
Specifically, the gear of the arc suppression coil corresponding to the largest voltage value among the measured voltage values is a working gear, that is, a resonance point.
Optionally, in the process of detecting the neutral point voltage corresponding to each gear of the arc suppression coil, if the neutral point voltage corresponding to a gear is greater than the preset bus phase voltage, the previous gear of the gear is used as the working gear.
Specifically, if the neutral point voltage is increased to the preset bus phase voltage in the gear shifting measurement process, the gear shifting is stopped to be shifted downwards, and the previous gear of the gear is determined as a working gear, namely a resonance point. For example, since the pre-tuned arc suppression coil is operated normally, it needs to be pre-tuned, i.e., operated close to the resonance point. The crowbar coil operates close to the resonance point because series resonance amplifies the neutral point imbalance voltage. It is therefore generally required that the maximum degree of imbalance does not exceed the preset busbar phase voltage. For example, since the busbar phase voltage is generally preset to 15% of the busbar phase voltage and the neutral point voltage is at the 5 th position when the neutral point voltage increases to 15% of the busbar phase voltage, the 6 th position, which is the first position of the 5 th position, is determined as the operating position, i.e., the resonance point. The resonance point refers to the gear corresponding to the current system capacitance current. And determining the capacitance current value of the system through the resonance point, thereby determining the operation gear of the pre-adjusting arc suppression coil.
Optionally, the secondary system comprises an arc suppression coil controller; the secondary system of the compound grounding system is operated, and the step of adjusting the arc suppression coil to enable the second capacitance current to be matched with the first capacitance current comprises the following steps:
the gear of the arc suppression coil is adjusted to the highest gear;
the small-resistance switching circuit breaker is switched off, the arc suppression coil controller automatically adjusts the gear of the arc suppression coil, and second capacitance current is measured;
and comparing the second capacitance current with the first capacitance current to match the second capacitance current with the first capacitance current.
Specifically, referring to fig. 1, after the arc suppression coil power transmission test is completed, the secondary system is operated, the gear of the arc suppression coil LP is adjusted to the highest gear X again in a manual or automatic mode, the small resistance circuit breaker 101JR is turned off, and the arc suppression coil controller controls the gear of the arc suppression coil LP to start to automatically measure the capacitance current of the composite grounding system from high to low. When the capacitance current is measured, the measurement result of the second capacitance current is compared with the measurement result of the first capacitance current, and the second capacitance current which is not much different from the measurement result of the first capacitance current is matched.
Based on the above embodiment, optionally, the gear of the arc suppression coil corresponding to the second capacitive current is locked, and the completing of the electrification of the composite grounding system includes:
closing the small-resistance switching circuit breaker;
and locking the gear of the arc suppression coil corresponding to the second capacitance current.
Specifically, when the second capacitive current which is not much different from the first capacitive current in measurement is detected by matching the second capacitive current, the low-resistance grounding system is put into operation again, the gear of the arc suppression coil corresponding to the second capacitive current which is not much different from the first capacitive current is used as a preset gear, a locking standby state is carried out, the state of the current device can be checked with a background communication and measurement and control screen of the composite grounding system, and the corresponding parameters are normal, so that the power transmission is successfully completed. Wherein, when the system normally operates, the arc suppression coil waits for at the preset gear, and when single-phase earth fault took place for the system, the arc suppression coil compensated, through the preset arc suppression coil, reduced primary equipment components and parts, and simple structure is reliable, and the compensation does not rely on secondary power when the trouble takes place.
Optionally, adjusting the composite grounding system to a debugging state includes:
power transmission debugging of a secondary system;
and after the secondary system finishes power transmission debugging, performing at least two charging impacts on the grounding transformer.
Specifically, the secondary system is an indispensable important component of the power system, and the secondary system includes secondary equipment, and the secondary equipment is auxiliary equipment for monitoring, measuring, controlling, protecting and adjusting primary equipment in the power system, and is exemplarily described by taking a 35kV composite grounding system as an example, wherein the secondary equipment includes a small resistance cabinet, a circuit breaker cabinet, a grounding transformer cabinet, an arc suppression coil cabinet and the like. Wherein, the debugging of little resistance cabinet power transmission: the secondary room power of closed little resistance cabinet is empty to be opened, detects whether light switch and light function are normal, opens warm and humid controller, and whether check warm and humid controller temperature and humidity threshold parameter are normal, whether check intelligent resistance monitor is normal power-on. Debugging power transmission of the circuit breaker cabinet: and closing the power supply of the secondary chamber of the circuit breaker cabinet, and detecting whether the functions of the lighting lamp switch and the lighting lamp of the circuit breaker cabinet are normal or not. And checking whether the arc suppression coil controller is normally powered on. After setting the arc suppression coil controller to be in a manual mode, closing the arc suppression coil controller and a power switch of a damping part, detecting whether the function of the arc suppression coil controller is normal, and after starting the arc suppression coil controller, setting relevant parameters of the arc suppression coil controller, wherein the relevant parameters comprise power grid grade, highest gear and the like. And (3) power transmission debugging of the grounding transformer cabinet: whether the functions of a lighting lamp switch and a lighting lamp of the breaker cabinet are normal is detected. Debugging the power transmission of the arc suppression coil cabinet: and closing the power supply of the secondary chamber of the arc suppression coil cabinet, and detecting whether the functions of an illuminating lamp of the arc suppression coil cabinet are normal or not. And checking whether the damping controller is normally powered on. And checking whether the on-load switch is normally electrified or not and whether the up-down gear shifting is normal or not. And (3) performing secondary integral joint debugging after the cabinet body is debugged: and checking whether the gear of the on-load switch is correct or not, wherein the gear on the arc suppression coil controller is consistent with the gear of the on-load switch. And detecting whether the trip function and the signal receiving function are normal or not, wherein under the condition that the arc suppression coil is not put into operation, the damping resistor loop has no current, the damping resistor is in an off-line state, and the node signal output of the damping resistor is detected to be 0 (the node is not conducted), so that the characteristic of the off-line damping resistor is represented. Because the grounding transformer is not put into operation at one time, the neutral point voltage of the grounding transformer is very small, the initial gear of the arc suppression coil is adjusted, the arc suppression coil is adjusted to the highest gear, and the power transmission of the system part is waited for at one time.
When power transmission debugging of primary equipment is carried out, firstly, grounding transformer power transmission is carried out, and charging impact is carried out, wherein the charging impact is used for checking the insulation strength and the mechanical strength of a grounding transformer, checking the performance of the differential protection for avoiding the excitation surge current, and checking whether relay protection can be mistakenly operated under the action of large excitation surge current. The impact times can be adjusted according to the engineering condition of the grounding transformer. For example, referring to fig. 1, charging impact is performed on a grounding transformer TM, a small resistance circuit breaker 101JR is closed, an arc suppression coil isolation switch 101JL is opened, a grounding knife switch 101J0 is opened, and a circuit breaker 101J handcart is swung to a working position, namely a cold standby position; the breaker switch 101JC is closed for charging, exemplary first charging for 5 minutes, the breaker switch 101JC is opened, and the first charging is completed. And closing the breaker switch 101JC again, charging for 5 minutes for the second time, opening the breaker switch 101JC, finishing the charging for the second time, closing the breaker switch 101JC again, charging for 5 minutes for the third time, opening the breaker switch 101JC, finishing the charging for the third time, and finishing the impact of the grounding transformer. It should be noted that the present embodiment uses three charging impacts, which is only for illustration and is not limited in particular. Shaking the cubical switchboard handcart 101J to the test position, hot standby position promptly, closed ground switch 101J0, closing arc suppression coil isolation switch 101JL shakes the operating position with circuit breaker 101J handcart, closes circuit breaker switch 101JC, accomplishes the impact back that the ground connection becomes, can compound ground system's power transmission.
Fig. 4 is a schematic flowchart of another method for debugging a composite grounding system in a live state according to an embodiment of the present invention, referring to fig. 4,
s410, adjusting the composite grounding system to be in a debugging state;
s420, electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil;
s430, operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current;
and S440, locking the gear of the arc suppression coil corresponding to the second capacitance current, and completing electrification of the composite grounding system.
S450, checking and monitoring the composite grounding system, and detecting the accuracy of grounding and line selection.
Specifically, after the power-on is completed, the power transmission detection can be performed on the grounding line selection, and the function of the monitoring system is detected and the power transmission detection is performed. Illustratively, the wiring correctness and integrity of control cables such as a grounding route selection access corresponding section, a secondary current transformer, a control loop and the like are checked. And checking the communication connection between the grounding line selection equipment and the monitoring system, and checking the correctness and the integrity of a point table of a background signal of the device. When the analog addition is debugged, the external unprotected current transformer terminal is in short circuit, the delivery protection outlet is confirmed to be removed, and the zero sequence protection misoperation of the corresponding loop is avoided. When each loop is rechecked in a protection test, the accuracy and consistency of the grounding and line selecting functions of the monitoring system and the line selecting device are verified, and the fusion implementation of the grounding and line selecting functions of the monitoring system is guaranteed.
Fig. 5 is a schematic flowchart of another method for debugging a composite grounding system in a live state according to an embodiment of the present invention, and referring to fig. 5, a 35kV composite grounding system is taken as an example for explanation, and S510, the debugging of the composite grounding system in the live state is started. S520, detecting the composite grounding system before starting, and adjusting the composite grounding system to be in a debugging state. The method comprises the steps of detecting the state of the composite grounding system, and adjusting the composite grounding system to be in a debugging state. And S530, powering on the primary system of the composite grounding system for debugging, and performing charging impact on the grounding transformer to ensure the stability of the grounding transformer. And S540, electrifying the arc suppression coil, and acquiring the capacitance current in the cable line according to the working gear of the arc suppression coil. And S550, electrifying the secondary system, and starting the arc suppression coil controller to automatically measure the capacitance current of the system after the small-resistance switching circuit breaker is positioned in a branch position. When the capacitance-capacitance current is measured, the measured result is similar to the capacitance current in the cable line, the small resistor is put into operation again, and the arc suppression coil enters a locking standby state. And S560, grounding line selection and background monitoring power transmission debugging. And S570, finishing the live debugging.
Fig. 6 is a schematic structural diagram of a live-line debugging device of a composite grounding system according to an embodiment of the present invention, referring to fig. 6, including: the device comprises an adjusting module, an obtaining module, an operating module and a locking module;
the adjusting module 610 is used for adjusting the composite grounding system to a debugging state;
after a primary system of the composite grounding system is powered on, the obtaining module 620 is used for obtaining a first capacitance current in a cable line according to a working gear of the arc suppression coil;
the operation module 630 is configured to operate a secondary system of the composite ground system, adjust a gear of the arc suppression coil, and measure a second capacitive current, so that the second capacitive current matches the first capacitive current;
the locking module 640 is configured to lock a gear of the arc suppression coil corresponding to the second capacitive current.
According to the technical scheme provided by the embodiment of the invention, the composite grounding system is adjusted to be in a debugging state through the adjusting module, so that the composite grounding system is ensured to be correctly wired and safe in equipment, and basic preparation is made for the subsequent power-on debugging of the composite grounding system. The method comprises the steps that a primary system of the composite grounding system is powered on, and an acquisition module acquires a first capacitance current in a cable line according to a working gear of an arc suppression coil; the operation module is used for electrifying and operating a secondary system of the composite grounding system, wherein small-resistance grounding is required to be disconnected during electrifying and operating of the secondary system, the gears of the arc suppression coils are adjusted according to a certain rule again and the capacitance current of each gear is measured, the locking module takes the gear of the arc suppression coil corresponding to the second capacitance current which is not greatly different from the first capacitance current as a pre-adjusted gear, when the system operates normally, the arc suppression coil waits for the pre-adjusted gear, the electrified debugging of the composite grounding system is realized, the debugging working steps are reduced, and the debugging efficiency is improved.
Optionally, the live-line debugging device of the composite grounding system further includes: a work gear confirmation module; the working gear confirming module comprises a first adjusting unit, a detecting unit and a confirming unit;
the first adjusting unit is used for adjusting the gear of the arc suppression coil to the highest gear;
the detection unit is used for reducing the gears of the arc suppression coil from the highest gear to the next gear and detecting the neutral point voltage corresponding to each gear of the arc suppression coil;
the confirming unit is used for selecting a gear corresponding to the maximum neutral point voltage as a working gear.
Optionally, the detection unit is further configured to, in the process of detecting the neutral point voltage corresponding to each shift of the arc suppression coil, if the neutral point voltage corresponding to one shift is greater than the preset bus phase voltage, use the previous shift of the shift as the working shift.
The composite grounding system live-line debugging device provided by the embodiment of the invention and the composite grounding system live-line debugging method provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and the detailed technical details in the embodiment are not shown in the composite grounding system live-line debugging method provided by any embodiment of the invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for debugging a composite grounding system in an electrified manner is characterized by comprising the following steps:
adjusting the composite grounding system to a debugging state;
electrifying a primary system of the composite grounding system, and acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil;
operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current;
and locking the gear of the arc suppression coil corresponding to the second capacitance current, and completing the electrification of the composite grounding system.
2. The electrified debugging method of the composite grounding system of claim 1, wherein before a primary system of the composite grounding system is powered on and a first capacitance current in a cable line is obtained according to a working gear of an arc suppression coil, the method comprises the following steps:
adjusting the gear of the arc suppression coil to be the highest gear;
reducing the gears of the arc suppression coil from the highest gear step by step, and detecting the neutral point voltage corresponding to each gear of the arc suppression coil;
and selecting the gear corresponding to the maximum neutral point voltage as the working gear.
3. The live-line debugging method of the compound grounding system according to claim 2, wherein in the process of detecting the neutral point voltage corresponding to each gear of the arc suppression coil, if the neutral point voltage corresponding to one gear is greater than a preset bus phase voltage, the previous gear of the gears is taken as the working gear.
4. The live commissioning method of a compound grounding system of claim 1, wherein said secondary system comprises an arc suppression coil controller; operating a secondary system of the compound grounding system, and adjusting the shift of the arc suppression coil to match the second capacitive current with the first capacitive current comprises:
adjusting the gear of the arc suppression coil to the highest gear;
switching off the small-resistance switching circuit breaker, and automatically adjusting the gear of the arc suppression coil by the arc suppression coil controller and measuring the second capacitance current;
and comparing the second capacitance current with the first capacitance current to match the second capacitance current with the first capacitance current.
5. The electrified debugging method of claim 4, wherein the gear of the arc suppression coil corresponding to the second capacitance current is locked, and the completion of the electrification of the composite grounding system comprises:
closing the small-resistance switching circuit breaker;
and locking the gear of the arc suppression coil corresponding to the second capacitance current.
6. The live debugging method of the composite grounding system of claim 1, wherein adjusting the composite grounding system to a debugging state comprises:
power transmission debugging of a secondary system;
and after the secondary system finishes power transmission debugging, performing at least two charging impacts on the grounding transformer.
7. The method for debugging the composite grounding system in the live state according to claim 1, further comprising, after the composite grounding system is powered up, the following steps:
and checking and monitoring the composite grounding system, and detecting the accuracy of grounding and line selection.
8. The utility model provides a compound ground system live debugging device which characterized in that includes: the device comprises an adjusting module, an obtaining module, an operating module and a locking module;
the adjusting module is used for adjusting the composite grounding system to be in a debugging state;
after the primary system of the composite grounding system is powered on, the acquisition module is used for acquiring a first capacitance current in a cable line according to a working gear of an arc suppression coil;
the operation module is used for operating a secondary system of the composite grounding system, adjusting the gear of the arc suppression coil and measuring a second capacitance current to enable the second capacitance current to be matched with the first capacitance current;
the locking module is used for locking the gear of the arc suppression coil corresponding to the second capacitance current.
9. The electrified debugging device of claim 8, further comprising a work gear confirmation module; the working gear confirming module comprises a first adjusting unit, a detecting unit and a confirming unit;
the first adjusting unit is used for adjusting the gear of the arc suppression coil to be the highest gear;
the detection unit is used for reducing the gears of the arc suppression coil from the highest gear to the next gear and detecting the neutral point voltage corresponding to each gear of the arc suppression coil;
the confirming unit is used for selecting the gear corresponding to the maximum neutral point voltage as the working gear.
10. The live debugging device of composite grounding system of claim 9,
the detection unit is further configured to, in the process of detecting the neutral point voltage corresponding to each gear of the arc suppression coil, if the neutral point voltage corresponding to one gear is greater than a preset bus phase voltage, use a previous gear of the gear as the working gear.
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