CN110389276B - Single-phase grounding fault management system and method - Google Patents
Single-phase grounding fault management system and method Download PDFInfo
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- CN110389276B CN110389276B CN201910722336.1A CN201910722336A CN110389276B CN 110389276 B CN110389276 B CN 110389276B CN 201910722336 A CN201910722336 A CN 201910722336A CN 110389276 B CN110389276 B CN 110389276B
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- 230000001052 transient effect Effects 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims description 48
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application discloses a single-phase earth fault management system, which comprises: the power distribution network power supply circuit unit, the node and branch fault early warning unit, the transmission efficiency monitoring unit and the control unit are used for predicting permanent ground faults, transient ground faults and broken line ground faults according to information collected by the transmission efficiency monitoring unit and data information fed back by the node and branch fault early warning unit; the control unit is also used for checking the fault line selection accuracy of the current power distribution network power supply line unit according to the current fault type. The application solves the defect that the traditional arc suppression coil compensation method and the contact arc suppression method are adopted independently, and can realize the functions of switch grounding arc suppression, voltage transformer protection, line monitoring, fault line selection prediction and verification by combining the contents of the arc suppression coil compensation method and the contact arc suppression method.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to a single-phase ground fault management system and method.
Background
The current widely used small current line selection mode in the market is often influenced by various factors such as large ground point impedance change range, complex working condition, weak zero sequence current signal, strong electromagnetic interference and the like, and is difficult to quickly and accurately select the branch circuit with single-phase grounding fault, and the line selection accuracy is low.
Common single-phase earth fault processing methods include an arc suppression coil compensation method and a contact arc suppression method, and the two fault processing methods have the following advantages: the arc suppression coil compensation method is suitable for temporary grounding faults; whereas the contact extinction algorithm is adapted to handle permanent single phase earth faults. There are great limitations in choosing only a single failure handling method in the system application. When the system has a permanent single-phase grounding fault, such as single-phase earth insulation breakdown in the cable, the capacitance current of the arc suppression coil compensation system flows through the fault point, and when the voltage of the arc extinction fault phase is recovered, the destroyed cable internal earth insulation cannot be recovered, and the cable internal earth insulation cannot be broken down again. Thus, the repeated breakdown continuously injects energy into the fault point, phase insulation near the fault point is gradually destroyed, and finally, the cable phase is possibly short-circuited, so that the accident is enlarged. When a temporary single-phase ground fault occurs in the system, the contact extinction algorithm alone causes an artificial ground point to the system, converting a temporary ground fault that may be eliminated into a permanent fault, which is obviously not a proper choice.
Disclosure of Invention
The application aims to overcome the defects of the prior art, provides a single-phase grounding fault management system and a single-phase grounding fault management method, solves the defects of the traditional arc suppression coil compensation method and the contact arc suppression method which are adopted independently, and can realize the functions of switch grounding arc suppression, voltage transformer protection, line monitoring, fault route selection prediction and verification by combining the contents of the arc suppression coil compensation method and the contact arc suppression method.
The aim of the invention is realized by the following technical scheme:
a single phase earth fault management system comprising:
the power distribution network power supply line unit comprises a power distribution network with a neutral point not grounded, wherein the neutral point is grounded to the power distribution network through an arc suppression coil or the neutral point is grounded to the power distribution network through a resistor; the power supply circuit unit of the power distribution network further comprises a resonance elimination circuit, wherein the resonance elimination circuit is arranged in the power distribution network with the neutral point not grounded, the power distribution network with the neutral point grounded through an arc suppression coil or the power distribution network with the neutral point grounded through a resistor;
The node and branch fault early warning unit is used for collecting node information in the power supply line unit of the power distribution network and analyzing and judging whether a circuit fault exists according to the collected node information; the node and branch fault early warning unit is also used for early warning circuit faults;
The transmission efficiency monitoring unit is used for collecting and monitoring current and voltage information in the power distribution network power supply line unit; the transmission efficiency monitoring unit is also used for monitoring the switching value of the power supply line unit of the power distribution network;
The control unit is used for predicting permanent ground faults, transient ground faults and broken line ground faults according to the information collected by the transmission efficiency monitoring unit and the data information fed back by the node and branch fault early warning unit; the control unit is also used for checking the fault line selection accuracy of the current power supply line unit of the power distribution network according to the current fault type;
The control unit further comprises a closing time delay module and a brake separating time delay module, wherein the closing time delay module is used for providing delay operation after the power supply line unit of the power distribution network performs one-time action, and the brake separating time delay module is used for realizing time delay with the system recovery after the power supply line unit of the power distribution network performs one-time action brake separating, and if the single-phase fault of the overtime line still exists, the new operation is continued.
Further, the power distribution network power supply line unit further comprises two parallel voltage transformers, a holding switch is further arranged between the two voltage transformers, the holding switch is used for connecting or disconnecting one voltage transformer or the two voltage transformers, and the controller is further used for detecting disconnection signals of the voltage transformers.
Further, the voltage transformer is an anti-resonance voltage transformer.
Further, the power distribution network power supply circuit further comprises a pulse line selection module, wherein the pulse line selection module is used for acquiring the electric leakage condition of the power distribution network power supply circuit, judging and screening a branch fault circuit according to the voltage of the three voltage sensors, the opening voltage and the branch current information, and performing branch fault line selection.
A single phase earth fault management system comprising:
A power distribution network power supply line unit;
The node and branch fault early warning unit is used for collecting node information in the power supply line unit of the power distribution network and analyzing and judging whether a circuit fault exists according to the collected node information; the node and branch fault early warning unit is also used for early warning circuit faults;
The transmission efficiency monitoring unit is used for collecting and monitoring current and voltage information in the power distribution network power supply line unit; the transmission efficiency monitoring unit is also used for monitoring the switching value of the power supply line unit of the power distribution network;
The control unit is used for predicting permanent ground faults, transient ground faults and broken line ground faults according to the information collected by the transmission efficiency monitoring unit and the data information fed back by the node and branch fault early warning unit; the control unit is also used for checking the fault line selection accuracy of the current power supply line unit of the power distribution network according to the current fault type;
Wherein,
The power supply line unit of the power distribution network is a neutral point ungrounded power distribution network;
The neutral point ungrounded power distribution network comprises a live display, a dynamic capture monitor, a grounding transformer, a single-phase vacuum contactor, a half-wave rectifier, a current transformer, a neutral point protector, a voltage transformer, a broadband voltage absorber, an isolating switch, a current limiting fuse, a high-voltage fuse and a dynamic monitoring controller; one end of the live wire is connected with the electrified display through the isolating switch, and the other end of the live wire is grounded through the isolating switch and the dynamic capture monitor; one end of the live wire is grounded through an isolating switch, a current limiting fuse, a grounding transformer, a single-phase vacuum contactor, a half-wave rectifier and a current transformer; one end of the live wire is grounded through an isolating switch, a high-voltage fuse, a voltage transformer and a neutral point protector; one end of the live wire is grounded through an isolating switch and a broadband voltage absorber; the dynamic monitoring controller is connected with the isolating switch.
A single-phase grounding fault management system comprises a power distribution network power supply line unit, a node and branch fault early warning unit, a transmission efficiency monitoring unit and a control unit;
the power supply line unit of the power distribution network is a power distribution network with neutral points grounded through a resistor;
The neutral point through resistance grounding distribution network comprises a grounding transformer, a first isolating switch, a resistor, an anti-saturation current transformer, a live display, a second isolating switch, a high-voltage fuse, a voltage transformer, an anti-resonance module, a full-voltage controller, a broadband voltage absorber and a control unit;
one end of the live wire is grounded through a grounding transformer, a first isolating switch, a resistor and an anti-saturation current transformer in sequence; one end of the fire wire is also grounded through the belt wire display; one end of the live wire is grounded through a second isolating switch and a broadband voltage absorber; one end of the live wire is also grounded through a second isolating switch, a high-voltage fuse, an anti-resonance voltage transformer and an anti-resonance module.
A single-phase earth fault management method, comprising:
And (3) parameter detection: establishing a power supply line node topological graph according to a power supply line unit of the power distribution network, and monitoring and displaying parameter information of preset nodes in real time;
Fault prediction and fault line selection analysis: and analyzing whether a circuit fault exists at the current moment or in a future preset time period according to the acquired node parameter information, judging whether the type of the circuit belongs to a permanent grounding fault, an instantaneous grounding fault or a broken line grounding fault, and analyzing fault line selection of a power supply line unit of the power distribution network according to the current fault type checksum.
Further, the method further comprises:
And (3) monitoring transmission efficiency: and collecting and monitoring current and voltage information in the power supply line unit of the power distribution network, and monitoring the switching value of the power supply line unit of the power distribution network.
Further, the method also comprises an action delay method, which specifically comprises the following steps:
When the power supply line unit of the power distribution network performs a closing action, closing delay time of a preset time period is required to be executed;
When the power distribution network power supply line unit generates a brake-off action, brake-off delay time of a preset time period is required to be executed;
when the switching-on action or the switching-off action is executed, the line fault still exists after the switching-on delay time or the switching-off delay time is exceeded, and then a new round of operation is executed.
Further, when the fault line selection method is executed, the method specifically includes:
and accurately measuring the leakage condition of the branch circuit through steady state measurement, and analyzing and determining the fault line selection of the branch circuit through data information of the three-phase voltage, the opening voltage and the branch circuit current.
The beneficial effects of the invention are as follows:
(1) The invention also increases the functions of switching-on time delay and switching-off time delay by a method of arc extinction by grounding the switch, so that the circuit voltage has strong stability and strong anti-interference capability;
(2) The invention adopts no external series resistor, directly and instantaneously short-circuits the opening voltage to realize resonance elimination and externally connects with a resonance elimination resistor, adopts two resonance elimination modes, and improves resonance elimination power;
(3) The system has the functions of node and branch fault early warning and transmission efficiency monitoring, and can collect node or branch current and voltage parameter information in real time, so that predictive analysis is carried out according to the collected parameter information, and whether line faults exist at the current moment or in a future preset time period is judged;
(4) The fault type can be judged to be a permanent ground fault, an instantaneous ground fault or a broken line ground fault according to the information collected by the transmission efficiency monitoring unit and the data information fed back by the node and branch fault early warning unit, and the accuracy of fault line selection of the current power distribution network power supply line unit can be checked according to the current fault type.
Drawings
FIG. 1 is a block diagram of a single-phase earth fault management system according to the present invention;
fig. 2 is a schematic diagram of a power supply circuit structure according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a power supply circuit structure according to embodiment 2 of the present invention;
fig. 4 is a schematic diagram of a power supply circuit structure according to embodiment 3 of the present invention;
in the figure, 1-live display, 2-dynamic capture monitor, 3-grounding transformer, 4-single-phase vacuum contactor, 5-half-wave rectifier, 6-current transformer, 7-neutral point protector, 8-voltage transformer, 9-wide-band voltage absorber, 10-isolating switch, 11-current limiting fuse, 12-high voltage fuse, 13-dynamic monitoring controller, 14-full-voltage controller, 15-switching arc suppression controller, 16-arc suppression coil, 17-vacuum switch, 18-full-network voltage suppressor, 19-high-speed switch, 20-overvoltage protector, 21-nonlinear resistor, 22-resistor, 23-anti-saturation current transformer, 24-anti-resonance module, 25-first isolating switch, 26-second isolating switch, 101-power distribution network power supply line unit, 102-node and branch fault early warning unit, 103-transmission efficiency monitoring unit, 104-control unit.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
the embodiment provides a single-phase earth fault management system, which is a neutral point non-earth distribution network management system, referring to fig. 1, and the system in this embodiment includes:
The power distribution network power supply circuit unit 101 further comprises a resonance elimination circuit, the resonance elimination circuit is arranged in the power distribution network with the neutral point not grounded, the resonance elimination circuit is a resistor which is not externally connected, the resonance elimination can be realized by directly and instantaneously shorting the opening voltage, the resonance elimination circuit further comprises a resonance elimination resistor which is externally connected, and the resonance elimination power can be improved;
the node and branch fault early-warning unit 102 is used for collecting node information in a power supply line unit of the power distribution network and analyzing and judging whether a circuit fault exists according to the collected node information; the node and branch fault early-warning unit 102 is further configured to early warn of a circuit fault;
The transmission efficiency monitoring unit 103, wherein the transmission efficiency monitoring unit 103 is used for collecting and monitoring current and voltage information in the power distribution network power supply line unit 101; the transmission efficiency monitoring unit 103 is further configured to monitor a switching value of the power distribution network power supply line unit 101;
the control unit 104 is configured to predict a permanent ground fault, a transient ground fault and a broken line ground fault according to the information collected by the transmission efficiency monitoring unit 103 and the data information fed back by the node and branch fault early warning unit 102; the control unit 104 is further configured to verify the accuracy of fault line selection of the current power supply line unit 101 of the power distribution network according to the current fault type;
The control unit 104 further includes a closing time delay module and a brake release time delay module, the closing time delay module is used for providing a delay operation after the power supply line unit of the power distribution network performs a primary action, and the brake release time delay module is used for realizing a recovery time delay with the system after the power supply line unit of the power distribution network performs a primary action brake release, and if a single-phase fault of the overtime line still exists, a new operation is continued.
Referring to fig. 2, the neutral point ungrounded distribution network includes a live display 1, a dynamic capture monitor 2, a grounding transformer 3, a single-phase vacuum contactor 4, a half-wave rectifier 5, a current transformer 6, a neutral point protector 7, a voltage transformer 8, a broadband voltage absorber 9, an isolating switch 10, a current limiting fuse 11, a high voltage fuse 12 and a dynamic monitoring controller 13; one end of the live wire is connected with the live display 1 through the isolating switch 10, and the other end of the live wire is grounded through the isolating switch 10 and the dynamic capture monitor 2; one end of the live wire is grounded through an isolating switch 10, a current limiting fuse 11, a grounding transformer 3, a single-phase vacuum contactor 4, a half-wave rectifier 5 and a current transformer 6; one end of the live wire is also grounded through an isolating switch 10, a high-voltage fuse 12, a voltage transformer 8 and a neutral point protector 7; one end of the live wire is also grounded through an isolating switch 10 and a broadband voltage absorber 9; the dynamic monitoring controller 13 is connected with the isolating switch 10.
Example 2:
The embodiment provides a single-phase grounding fault management system, which is a power distribution network with a neutral point grounded through an arc suppression coil, and referring to fig. 3, the management system includes:
The dynamic capture monitor 13, the neutral point protector 7, the anti-resonance voltage transformer 8, the broadband voltage absorber 9, the live display 1, the isolating switch 10, the high-voltage fuse 12, the full-network voltage suppressor 18, the current transformer 6, the live display 1, the isolating switch 10, the current limiting fuse 11, the vacuum switch 17, the nonlinear resistor 21, the half-wave rectifier 5, the overvoltage protector 20, the grounding transformer 3, the high-voltage fuse 12, the arc suppression coil 16 and the high-speed switch 19;
One end of the live wire is grounded through the isolating switch 10 and the live display 1; one end of the live wire is grounded through the isolating switch 10 and the dynamic capture monitor 2 in turn; one end of the live wire is grounded through an isolating switch 10, a high-voltage fuse 12, an anti-resonance voltage transformer 8 and a neutral point protector 7 in sequence; one end of the live wire is also grounded through an isolating switch 10 and a broadband voltage absorber 9; one end of the live wire is grounded through the isolating switch 10 and the electrified display 1 in sequence; one end of the live wire is grounded through an isolating switch 10, a current limiting fuse 11, a vacuum switch 17, a full-network voltage suppressor 18 and a grounding current transformer 6 in sequence; one end of the live wire is grounded through the isolating switch 10, the high-voltage fuse 12, the grounding transformer 3, the high-speed switch 19 and the arc suppression coil 16 in sequence; one end of the live wire is grounded through the isolating switch 10, the high-voltage fuse 12, the grounding transformer 3, the nonlinear resistor 21 and the half-wave rectifier 5 in sequence, one end of the live wire is grounded through the isolating switch 10 and the overvoltage protector 20 in sequence, and the switch arc extinguishing controller 15 is grounded through the isolating switch 10 and the electrified display 1 in sequence.
Aiming at the problems of the 6-35 KV neutral point non-effective grounding system, the single-phase grounding fault management system integrates the advantages of two grounding modes, well solves the problem of fault line selection accuracy, and provides a flexible, quick and effective fault processing means. The high power supply reliability of the original ungrounded system is maintained, and meanwhile, the safety problem of operation of electrical equipment caused by arc grounding overvoltage is solved.
Example 3:
The embodiment provides a single-phase grounding fault management system, which is a power distribution network with a neutral point grounded through a resistor, and comprises: the power distribution network power supply line unit 101, the node and branch fault early warning unit 102, the transmission efficiency monitoring unit 103 and the control unit 104;
the power distribution network power supply line unit 101 is a power distribution network with a neutral point grounded through a resistor;
Referring to fig. 4, a power distribution network 101 with a neutral point grounded through a resistor includes a grounding transformer 3, a first isolating switch 25, a resistor 22, an anti-saturation current transformer 23, a live display 1, a second isolating switch 26, a high-voltage fuse 12, a voltage transformer 6, an anti-resonance module 24, a full-voltage controller 14 and a broadband voltage absorber 9;
One end of the live wire is further grounded 23 through a grounding transformer 3, a first isolating switch 25, a resistor 22 and an anti-saturation current transformer in sequence; one end of the live wire is also grounded through the belt wire display 1; one end of the live wire is also grounded through a second isolating switch 26 and the broadband voltage absorber 9; one end of the live wire is also grounded through a second isolating switch 26, the high voltage fuse 12, the anti-resonant voltage transformer 8 and the anti-resonant module 24.
Since the prior operation mode that the neutral point is not grounded and the neutral point is grounded through the arc suppression coil is mostly adopted. In recent years, due to the development of a power system, the electricity consumption of users is increased, and some provincial and municipal power grids greatly popularize the operation mode of resistor grounding. When the neutral point grounding resistor cabinet is installed, the current flowing through the grounding point and the neutral point is obviously reduced compared with the current flowing through the neutral point when the neutral point grounding resistor cabinet is in nonmetallic grounding, meanwhile, the sound phase voltage rise is also obviously reduced, and the zero sequence voltage value is about half of that of single-phase metallic grounding. Therefore, the neutral point is grounded through the resistor, and the current-limiting voltage-reducing effect can be achieved when the ground fault exists. Because the neutral point resistor can absorb a large amount of resonance energy, the system resonance overvoltage is fundamentally restrained in the grounding mode with the resistor.
The resistor grounding system can be directly used when the transformer is in star connection, and when the transformer is in corner connection, an independent grounding transformer can be installed, and the neutral point resistor is connected with the transformer for use. When the system is grounded in a resistance grounding mode, sound phase voltage rises to system voltage after single-phase metallic grounding occurs, and three-phase voltage is quickly restored to a normal value after grounding is released. The system can stop power transmission without being grounded briefly.
Example 4:
the embodiment provides a single-phase earth fault management method, which comprises the following steps:
And (3) parameter detection: establishing a power supply line node topological graph according to a power supply line unit of the power distribution network, and monitoring and displaying parameter information of preset nodes in real time;
Fault prediction and fault line selection analysis: and analyzing whether a circuit fault exists at the current moment or in a future preset time period according to the acquired node parameter information, judging whether the type of the circuit belongs to a permanent grounding fault, an instantaneous grounding fault or a broken line grounding fault, and analyzing fault line selection of a power supply line unit of the power distribution network according to the current fault type checksum.
Further, the method further comprises:
And (3) monitoring transmission efficiency: and collecting and monitoring current and voltage information in the power supply line unit of the power distribution network, and monitoring the switching value of the power supply line unit of the power distribution network.
Further, the method also comprises an action delay method, which specifically comprises the following steps:
When the power supply line unit of the power distribution network performs a closing action, closing delay time of a preset time period is required to be executed;
When the power distribution network power supply line unit generates a brake-off action, brake-off delay time of a preset time period is required to be executed;
when the switching-on action or the switching-off action is executed, the line fault still exists after the switching-on delay time or the switching-off delay time is exceeded, and then a new round of operation is executed.
Further, when the fault line selection method is executed, the method specifically includes:
and accurately measuring the leakage condition of the branch circuit through steady state measurement, and analyzing and determining the fault line selection of the branch circuit through data information of the three-phase voltage, the opening voltage and the branch circuit current.
In the neutral point non-effective grounding system, a neutral point is led out through a grounding transformer, and the neutral point and the nonlinear resistor are grounded. The system operates normally, and the neutral point is not grounded. When a certain loop of the system generates intermittent arc or permanent arc ground fault, the neutral point voltage of the grounding transformer is raised, the nonlinear resistor is conducted, the zero sequence loop transmits a zero sequence current amplified to the ground, the current is transmitted to the main controller through the fault loop acquisition unit, meanwhile, the three-phase voltage of the whole network system A, B, C is dynamically monitored in real time through the dynamic capture monitor, and the variation of the monitored voltage and the phase angle of the system are judged, analyzed and the fault phase of the system is selected.
When gap arc overvoltage occurs in the system, the voltage of a non-fault phase can be increased to 1.5-3.5 times, the normal operation of the system is seriously influenced, the system generates instant gap overvoltage and develops into arc, the control system monitors the change of the full-network voltage and then puts the full-network overvoltage suppressor into operation, various overvoltage and gap arc overvoltage generated by the system are absorbed to protect the system, and the safe operation of the system is maintained.
When the gap arc light overvoltage capacity is large, the control system exits the full-network voltage suppressor after monitoring the system change when the gap arc light overvoltage capacity is converted into single-phase fault grounding or permanent single-phase grounding fault, meanwhile, the switch is used for extinguishing arc light of the system, and when the system arc light is eliminated, the full-network voltage suppressor is used for extinguishing system peak overvoltage again, so that the system voltage parallelism is maintained, and the power supply safety of equipment is stably ensured.
When overvoltage fluctuation, high-resistance grounding or metallic grounding, transient or permanent grounding faults occur in the system, the system generates low-frequency, medium-frequency or high-frequency oscillation to cause primary and secondary resonance, the stability of metering and protection signals is seriously affected, the voltage transformer is burnt out and the voltage loss tripping is protected to realize high-voltage power failure in serious conditions, when the primary or secondary resonance occurs in the system, the control system eliminates the secondary resonance, and simultaneously gives out an instruction to enable an instantaneous switch to be put into, the primary resonance is eliminated, and the safe operation of the system is ensured.
The foregoing examples merely illustrate specific embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. A single phase earth fault management system, comprising:
the power distribution network power supply line unit comprises a power distribution network with a neutral point not grounded, wherein the neutral point is grounded to the power distribution network through an arc suppression coil or the neutral point is grounded to the power distribution network through a resistor; the power supply circuit unit of the power distribution network further comprises a resonance elimination circuit, wherein the resonance elimination circuit is arranged in the power distribution network with the neutral point not grounded, the power distribution network with the neutral point grounded through an arc suppression coil or the power distribution network with the neutral point grounded through a resistor;
The node and branch fault early warning unit is used for collecting node information in the power supply line unit of the power distribution network and analyzing and judging whether a circuit fault exists according to the collected node information; the node and branch fault early warning unit is also used for early warning circuit faults;
The transmission efficiency monitoring unit is used for collecting and monitoring current and voltage information in the power distribution network power supply line unit; the transmission efficiency monitoring unit is also used for monitoring the switching value of the power supply line unit of the power distribution network;
The control unit is used for predicting permanent ground faults, transient ground faults and broken line ground faults according to the information collected by the transmission efficiency monitoring unit and the data information fed back by the node and branch fault early warning unit; the control unit is also used for checking the fault line selection accuracy of the current power supply line unit of the power distribution network according to the current fault type;
The control unit further comprises a closing time delay module and a brake separating time delay module, wherein the closing time delay module is used for providing delay operation after the power supply line unit of the power distribution network performs one-time action, the brake separating time delay module is used for realizing time delay with the system recovery after the power supply line unit of the power distribution network performs one-time action brake separating, and if the single-phase fault of the overtime line still exists, the new operation is continued;
The neutral point ungrounded power distribution network comprises a live display, a dynamic capture monitor, a grounding transformer, a single-phase vacuum contactor, a half-wave rectifier, a current transformer, a neutral point protector, a voltage transformer, a broadband voltage absorber, an isolating switch, a current limiting fuse, a high-voltage fuse and a dynamic monitoring controller; one end of the live wire is connected with the electrified display through the isolating switch, and the other end of the live wire is grounded through the isolating switch and the dynamic capture monitor; one end of the live wire is grounded through an isolating switch, a current limiting fuse, a grounding transformer, a single-phase vacuum contactor, a half-wave rectifier and a current transformer; one end of the live wire is grounded through an isolating switch, a high-voltage fuse, a voltage transformer and a neutral point protector; one end of the live wire is grounded through an isolating switch and a broadband voltage absorber; the dynamic monitoring controller is connected with the isolating switch;
The neutral point through resistance grounding distribution network comprises a grounding transformer, a first isolating switch, a resistor, an anti-saturation current transformer, a live display, a second isolating switch, a high-voltage fuse, a voltage transformer, an anti-resonance module, a full-voltage controller, a broadband voltage absorber and a control unit;
one end of the live wire is grounded through a grounding transformer, a first isolating switch, a resistor and an anti-saturation current transformer in sequence; one end of the fire wire is also grounded through the belt wire display; one end of the live wire is grounded through a second isolating switch and a broadband voltage absorber; one end of the live wire is also grounded through a second isolating switch, a high-voltage fuse, an anti-resonance voltage transformer and an anti-resonance module.
2. The single-phase earth fault management system according to claim 1, wherein the power distribution network power supply line unit further comprises two parallel voltage transformers, a hold switch is further arranged between the two voltage transformers, the hold switch is used for connecting or disconnecting one voltage transformer or the two voltage transformers, and the control unit is further used for detecting disconnection signals of the voltage transformers.
3. A single phase earth fault management system according to claim 1 or 2, wherein the voltage transformer is an anti-resonant voltage transformer.
4. The single-phase earth fault management system according to claim 1, further comprising a pulse line selection module, wherein the pulse line selection module is configured to obtain a leakage condition of a power supply line of the power distribution network, and determine and screen a branch fault line according to the voltage of the three voltage sensors, the opening voltage and the branch current information, so as to perform branch fault line selection.
5. A single-phase earth fault management method applied to the single-phase earth fault management system as claimed in any one of claims 1 to 4, comprising:
And (3) parameter detection: establishing a power supply line node topological graph according to a power supply line unit of the power distribution network, and monitoring and displaying parameter information of preset nodes in real time;
Fault prediction and fault line selection analysis: and analyzing whether a circuit fault exists at the current moment or in a future preset time period according to the acquired node parameter information, judging whether the type of the circuit belongs to a permanent grounding fault, an instantaneous grounding fault or a broken line grounding fault, and analyzing fault line selection of a power supply line unit of the power distribution network according to the current fault type checksum.
6. A single phase earth fault management method as claimed in claim 5, further comprising:
And (3) monitoring transmission efficiency: and collecting and monitoring current and voltage information in the power supply line unit of the power distribution network, and monitoring the switching value of the power supply line unit of the power distribution network.
7. A single phase earth fault management method as claimed in claim 5, further comprising an action delay method, comprising:
When the power supply line unit of the power distribution network performs a closing action, closing delay time of a preset time period is required to be executed;
When the power distribution network power supply line unit generates a brake-off action, brake-off delay time of a preset time period is required to be executed;
when the switching-on action or the switching-off action is executed, the line fault still exists after the switching-on delay time or the switching-off delay time is exceeded, and then a new round of operation is executed.
8. A single-phase earth fault management method as claimed in claim 5, wherein the fault line selection method is performed by:
and accurately measuring the leakage condition of the branch circuit through steady state measurement, and analyzing and determining the fault line selection of the branch circuit through data information of the three-phase voltage, the opening voltage and the branch circuit current.
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| CN111308268B (en) * | 2020-02-06 | 2022-04-12 | 云南电网有限责任公司电力科学研究院 | A method and system for evaluating latent faults of distribution network equipment |
| CN111459066A (en) * | 2020-04-13 | 2020-07-28 | 深圳市永恒光照明科技有限公司 | Underground pipe network monitoring system of urban lighting facility |
| CN111755955B (en) * | 2020-07-02 | 2022-03-11 | 上海市计量测试技术研究院 | High-tension electricity cabinet ground protection device |
| CN113960406A (en) * | 2020-07-20 | 2022-01-21 | 李景禄 | Fault judgment and grounding line selection method for arc suppression coil grounding mode |
| CN112327099B (en) * | 2020-10-30 | 2021-10-01 | 南方电网科学研究院有限责任公司 | Power distribution network earth fault line selection tripping method and device and storage medium |
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| CN116466154B (en) * | 2023-03-23 | 2023-12-29 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
| CN116780488B (en) * | 2023-08-16 | 2023-11-14 | 山西迎润新能源有限公司 | New energy power station grounding protection system, method, electronic equipment and storage medium |
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