CN110797854A - Medium-voltage single-phase grounding processing system and method - Google Patents
Medium-voltage single-phase grounding processing system and method Download PDFInfo
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- H—ELECTRICITY
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- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
The invention discloses a medium-voltage single-phase grounding processing system, which comprises a bus and n parallel branches, wherein the bus and the branches are also connected with a monitoring and wave recording system, a comprehensive processing control system and a signal injection system; the signal injection system constructs a mode that a neutral point of a bus is not grounded and is grounded through a resistor; the monitoring and wave recording system comprises a first high-voltage isolating switch, a first high-voltage fuse and a broadband voltage sensor which are connected in series, wherein the broadband voltage sensor is used for reducing the high voltage of a bus into low voltage and transmitting a monitoring signal to a monitoring controller, and the monitoring controller is used for analyzing fault information and transmitting the fault information to the comprehensive processing control system; and the comprehensive processing control system selects a proper grounding mode according to the pulse signals and the fault information, and restores the neutral point to be ungrounded after the grounding fault disappears. The invention comprehensively utilizes three grounding operation modes to make up for deficiencies, utilizes a comprehensive processing control system to judge the system state in real time and puts into a proper grounding operation mode.
Description
Technical Field
The invention relates to the field of power equipment, in particular to a medium-voltage single-phase grounding processing system and a medium-voltage single-phase grounding processing method.
Background
The neutral point grounding mode of the power system is an important application technology for preventing system accidents and supplying power safely and reliably, and has the characteristic of combining theoretical research and practice. The medium-voltage power grid forms a wide power supply and distribution network, is responsible for directly supplying power to users, and is preferred in power supply safety and reliability.
The medium-voltage power grid grounding mode in China continues to adopt a neutral point ungrounded operation mode in a former Soviet Union mode, and the medium-voltage power grid grounding mode has the advantages of high power supply reliability, but continuous capacity expansion of circuits is developed along with the reform and opening of China, particularly more and more urban cable circuits, and when single-phase grounding occurs, the grounding current is obviously increased, so that arc extinction cannot be performed. Causing arc grounding overvoltage, cable burning, interphase short circuit and PT burning.
In order to reduce the capacitance current of single-phase grounding, an arc suppression coil is additionally arranged at a neutral point, namely the neutral point is grounded through the arc suppression coil, and the neutral point is grounded through a small resistor. Therefore, at present, the neutral point grounding modes in China mainly include 3 types: 1. a neutral ungrounded system; 2. the neutral point is grounded through an arc suppression coil; 3. the neutral point is grounded through a small resistor; the three grounding modes are compared as follows:
1. neutral point ungrounded mode
The advantages are that: the neutral point is not grounded, namely the neutral point is insulated to the ground, the structure is simple, the operation is convenient, no additional equipment is needed, and the investment is saved. When a single-phase earth fault occurs in a neutral point ungrounded system, the earth current is very small, if the fault is an instantaneous fault, the arc can be automatically extinguished generally, the phase voltage of the non-fault is not increased greatly, and the symmetry of the system cannot be damaged, so that the fault can be continuously supplied for 2h, the fault removing time is obtained, and the reliability of power supply is relatively improved.
The disadvantages are as follows: the neutral point is not grounded, and the energy stored in the capacitance of the power grid to the ground is not released because the neutral point is insulated. When the arc is grounded, the arc is repeatedly extinguished and reignited, and the process of repeatedly charging the capacitor is also repeated. Because the energy in the earth capacitance can not be released, the voltage is increased, thereby generating arc grounding overvoltage or resonance overvoltage, the value of which can reach a high multiple, and threatening the insulation of equipment.
In addition, because the power grid has capacitance and inductance elements, under a certain condition, linear resonance or ferromagnetic resonance is easily caused due to switching operation or failure, and the power grid with a shorter feeder line can excite high-frequency resonance to generate higher resonance overvoltage, so that the voltage transformer is broken down. The voltage transformer is low in impedance during frequency division resonance, and current passing through the voltage transformer is multiplied, so that fuse fusing or the voltage transformer is damaged due to overheating.
2. Neutral point grounding mode through arc suppression coil
The advantages are that: the neutral point is grounded through the arc suppression coil, namely an inductance arc suppression coil is connected between the neutral point and the ground. When the single-phase earth fault occurs in the power grid, the earth current is larger than 30A, the generated electric arc cannot be self-extinguished frequently, the probability of arc light earth overvoltage is increased, and the safe operation of the power grid is not facilitated. Therefore, the inductance current of the arc suppression coil is used for compensating the grounding capacitance current, so that the current passing through a fault point is reduced to a self-arc suppression range. The arc-extinguishing coil can achieve overcompensation operation within a certain range by operating the no-load tap switch, so that the grounding current is reduced. This allows the grid to continue to operate for a period of time, relatively increasing the reliability of the power supply.
The disadvantages are as follows: the arc suppression coil only compensates power frequency capacitance current, and actually contains a large amount of high frequency current and resistive current through the grounding point, even if the power frequency current of the fault point is compensated to be below 5A meeting the national standard requirement, the continuous combustion of the electric arc can be maintained, and the maintenance of power supply easily causes accident amplification, fire, personal injury and other disastrous consequences. The compensation of the arc suppression coil enables the steady-state characteristic difference of a fault line and a non-fault line to be very small, and challenges are brought to fault line selection. In the grounding mode, the single-phase grounding fault of the power grid is random, so that the action condition of the single-phase grounding protection device is complex, and the fault point is difficult to find. The arc suppression coil adopts an unloaded tap changer, and is difficult to realize overcompensation through manual operation based on experience. The arc suppression coil is an inductive element and forms a resonant circuit with a ground capacitor, and resonant overvoltage can occur under a certain condition. The arc suppression coil can compensate the single-phase grounding current to be reduced, which is difficult to realize relay protection.
3. The neutral point is grounded via a resistor
The advantages are that: the neutral point is grounded through a resistor, that is, a resistor with a certain resistance value is connected between the neutral point and the ground. The resistor and the system earth capacitance form a parallel circuit, because the resistor is an energy consumption element, a capacitance charge releasing element and a resonant resistance voltage element, the grounding capacitance current is increased to prevent resonant overvoltage and intermittent arc grounding overvoltage, so that the selected fault circuit becomes simple and reliable, and the overvoltage damage is reduced.
The disadvantages are as follows: when the grounding current is increased and single-phase grounding occurs, permanent grounding or instantaneous grounding acts on tripping operation to reduce the reliability of power supply. When the grounding current is increased and single-phase grounding happens, tripping is not timely, so that great damage is easily caused to the nearby insulation of the grounding point, and interphase short circuit is easily caused.
The advantages and the disadvantages of the three neutral point grounding operation modes are obvious, and the optimal grounding operation effect cannot be achieved by single application.
Disclosure of Invention
The invention provides a medium-voltage single-phase grounding processing system and a medium-voltage single-phase grounding processing method.
The technical scheme of the invention is realized as follows:
a medium-voltage single-phase grounding processing system comprises a bus and n parallel branches connected with the bus, wherein each branch is provided with a current transformer and a pulse signal acquisition unit, the pulse signal acquisition unit is used for acquiring pulse signals of the current transformers, and the medium-voltage single-phase grounding processing system further comprises a monitoring and wave recording system, a comprehensive processing control system and a signal injection system;
the signal injection system is used for constructing a grounding mode of the bus, including but not limited to ungrounded neutral points and grounding through a resistor;
the monitoring and wave recording system comprises a first high-voltage isolating switch, a first high-voltage fuse and a broadband voltage sensor which are connected in series, wherein the first high-voltage isolating switch is connected with a bus, the broadband voltage sensor is grounded, the broadband voltage sensor reduces the high voltage of the bus into low voltage and transmits a monitoring signal to a monitoring controller, and the monitoring controller analyzes the fault information and transmits the fault information to the comprehensive processing control system;
the comprehensive processing control system is used for constructing an arc suppression coil grounding mode of a bus, receiving and processing pulse signals and fault information, selecting a proper grounding mode from neutral point ungrounded, arc suppression coil grounding and resistance grounding, sending a control command to the signal injection system, and recovering the neutral point ungrounded after the grounding fault disappears.
As a preferred embodiment of the present invention, the integrated processing control system includes a second high voltage isolator, a second high voltage fuse, a vacuum contactor, a first ground current transformer, an arc suppression coil, a second ground current transformer, and a main controller, the second high voltage isolator, the second high voltage fuse, the vacuum contactor, and the first ground current transformer are connected in series in sequence, the arc suppression coil and the second ground current transformer are connected in series, the second high voltage isolator is connected to a bus, the first and second ground current transformers are grounded, the main controller is electrically connected to the second high voltage isolator, the second high voltage fuse, the vacuum contactor, the first ground current transformer, the arc suppression coil, and the second ground current transformer, respectively, and the monitoring controller transmits the analysis result to the main controller.
As a preferred embodiment of the present invention, the signal injection system includes a grounding transformer, a third high-voltage isolating switch, a third high-voltage fuse, a voltage transformer and a high-voltage switch, wherein one end of the third high-voltage isolating switch is connected to the bus, the other end of the third high-voltage isolating switch is respectively connected to one end of the third high-voltage fuse and the grounding transformer, the other end of the third high-voltage fuse is connected to one end of the voltage transformer, the other end of the voltage transformer is respectively connected to the arc suppression coil and the high-voltage switch, and the high-voltage switch is grounded via a resistor; the main controller is respectively electrically connected with the third high-voltage isolating switch, the third high-voltage fuse, the voltage transformer and the high-voltage switch.
As a preferred embodiment of the present invention, the monitoring and wave recording system transmits the collected fault information to the main controller through optical fiber communication.
A medium-voltage single-phase grounding processing method is characterized in that a medium-voltage power grid comprises a bus and a plurality of parallel branches connected with the bus, and the method specifically comprises the following steps:
s1, the monitoring and wave recording system collects system fault information and sends the system fault information to the comprehensive processing control system;
s2, judging whether there is earth fault, if yes, executing the next step, otherwise repeating the step S1;
s3, setting the grounding mode of the neutral point as arc suppression coil grounding;
s4, judging whether the ground fault disappears, if so, returning to the step S1, otherwise, executing the next step;
s5, putting a resistor to be grounded on the basis of grounding of the arc suppression coil, screening out a fault grounded branch and giving an alarm;
s6, judging whether the ground fault disappears, if so, returning to the step S1 after the ground fault is successfully recovered, judging the ground fault to be an instantaneous ground fault, otherwise, executing the next step;
s7, the comprehensive processing control system converts the arc grounding into metal grounding, short-circuits grounding capacitance current and sends out an alarm signal;
and S8, checking whether the fault-grounded branch is normal, and repeating the step S1.
As a preferred embodiment of the present invention, in step S1, the branch is set as a neutral point, and the fault information of the bus and the branch is monitored by the recording system in a non-grounded manner, the branch is set with a current transformer, and the broadband signal acquisition unit acquires a broadband signal of the current transformer and transmits the broadband signal to the integrated processing control system.
The invention has the beneficial effects that: and comprehensively utilizing the three grounding operation modes to make up for the deficiencies, judging the system state in real time by utilizing a comprehensive processing control system, and putting the system into a proper grounding operation mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a medium voltage single phase ground processing system according to the present invention;
FIG. 2 is a flow chart of a medium voltage single phase grounding processing method according to the present invention;
fig. 3 is a flowchart of a medium-voltage single-phase grounding processing method according to the present invention.
In the figure, 1-bus; 2-branch; 3-a current transformer; 4-a pulse signal acquisition unit; 5-a voltage transformer; 6-a grounding transformer; 7-a high-voltage switch; 8-arc suppression coil; 9-a main controller; 10-a vacuum contactor; 11-monitoring the controller; 12-a broadband voltage sensor; 13-a second high voltage fuse; 14-third high voltage isolator switch.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, the invention provides a medium-voltage single-phase grounding processing system, which comprises a bus 1 and n parallel branches 2 connected with the bus 1, wherein the bus 1 is subjected to high-voltage reduction to form the branches 2, each branch 2 is provided with a current transformer 3 and a pulse signal acquisition unit 4, and the pulse signal acquisition unit 4 is used for acquiring pulse signals of the current transformers 3 and further comprises a monitoring and wave recording system, a comprehensive processing control system and a signal injection system;
the signal injection system is used for constructing grounding modes of the bus 1, including but not limited to ungrounded neutral points and grounding through resistors;
the monitoring and wave recording system comprises a first high-voltage isolating switch, a first high-voltage fuse and a broadband voltage sensor 12 which are connected in series, the first high-voltage isolating switch is connected with a bus 1, the broadband voltage sensor is grounded, the broadband voltage sensor 12 reduces the high voltage of the bus 1 to be low voltage, monitoring signals are transmitted to a monitoring controller 11, the monitoring controller 11 analyzes the signals to obtain fault information, and the fault information is transmitted to the comprehensive processing control system;
the comprehensive processing control system is used for constructing a grounding mode of an arc suppression coil 8 of the bus 1, receiving and processing pulse signals and fault information, selecting a proper grounding mode from neutral point ungrounded, arc suppression coil 8 grounded and resistance grounded, sending a control command to the signal injection system, and recovering the neutral point ungrounded after the grounding fault disappears.
The comprehensive treatment control system comprises a second high-voltage isolating switch, a second high-voltage fuse 13, a vacuum contactor 10, a first grounding current transformer 3, an arc suppression coil 8, a second grounding current transformer 3 and a main controller 9, the second high-voltage isolating switch, the second high-voltage fuse 13, the vacuum contactor 10 and the first grounding current transformer 3 are sequentially connected in series, the arc suppression coil 8 is connected with the second grounding current transformer 3 in series, the second high-voltage isolating switch is connected with a bus 1, the first grounding current transformer 3 and the second grounding current transformer 3 are grounded, the main controller 9 is respectively connected with the second high-voltage isolating switch, the second high-voltage fuse 13, the vacuum contactor 10, the first grounding current transformer 3, the arc suppression coil 8 and the second grounding current transformer 3 in an electric connection mode, and the monitoring controller 11 transmits an analysis result to the main controller 9.
The signal injection system comprises a grounding transformer 6, a third high-voltage isolating switch 14, a third high-voltage fuse, a voltage transformer 5 and a high-voltage switch 7, one end of the third high-voltage isolating switch 14 is connected with the bus 1, the other end of the third high-voltage isolating switch is respectively connected with one end of the third high-voltage fuse and the grounding transformer 6, the other end of the third high-voltage fuse is connected with one end of the voltage transformer 5, the other end of the voltage transformer 5 is respectively connected with an arc suppression coil 8 and the high-voltage switch 7, and the high-voltage switch 7 is grounded through a resistor; the main controller 9 is electrically connected with the third high-voltage isolating switch 14, the third high-voltage fuse, the voltage transformer 5 and the high-voltage switch 7 respectively.
The working principle of the invention is as follows: the broadband electronic current transformer 3 is fixed on the branch 2, the branch 2 is a low-voltage part for monitoring and metering of the current transformer 3, the broadband electronic current transformer 3 ensures that conversion is not distorted, has no distorted edge, is unsaturated and has no resonance, and a reliable data source is provided for the next calculation and judgment of the system. When the system has faults of overvoltage, undervoltage, grounding, disconnection and the like, the monitoring controller 11 acquires waveforms of 100mS before and after the faults occur, and displays the waveforms of the system UA/UB/UC/UD in real time. The monitoring controller 11 transmits the collected fault information to the main controller 9 by using optical fiber communication, and the main controller 9 comprehensively processes and judges the fault information according to the received fault information, completes data interaction in real time and analyzes the running state of the system. And when the system is grounded, a reasonable and effective grounding processing mode is judged and selected according to the data analysis result. The invention can flexibly switch the mode of operating the neutral point without grounding, the mode of grounding the neutral point through the arc suppression coil 8 and the mode of grounding the neutral point through the small resistor. The advantages of the operation modes are integrated, the main controller 9 sends an instruction to switch to which operation mode, the defects in the grounding modes are eliminated, and the effects of improving the advantages and avoiding the disadvantages are achieved.
As shown in fig. 2 and 3, the present invention further provides a medium-voltage single-phase grounding processing method, where a medium-voltage power grid includes a bus 1 and a plurality of parallel branches 2 connected to the bus 1, and the method specifically includes the following steps:
s1, the monitoring and wave recording system collects system fault information and sends the system fault information to the comprehensive processing control system;
s2, judging whether there is earth fault, if yes, executing the next step, otherwise repeating the step S1;
s3, setting the grounding mode of the neutral point as the grounding of the arc suppression coil 8;
s4, judging whether the ground fault disappears, if so, returning to the step S1, otherwise, executing the next step;
s5, putting a resistor to be grounded on the basis of grounding of the arc suppression coil 8, screening out the fault grounded branch 2 and giving an alarm;
s6, judging whether the ground fault disappears, if so, returning to the step S1 after the ground fault is successfully recovered, judging the ground fault to be an instantaneous ground fault, otherwise, executing the next step;
s7, the comprehensive processing control system converts the arc grounding into metal grounding, short-circuits grounding capacitance current and sends out an alarm signal;
and S8, checking that the fault-grounded branch 2 is recovered to be normal, and repeating the step S1.
As a preferred embodiment of the present invention, in step S1, the branch 2 is set as a neutral point, and the wave recording system monitors the fault information of the collecting bus 1 and the branch 2 in a non-grounding manner, the current transformer 3 is set on the branch 2, and the broadband signal collecting unit collects the broadband signal of the current transformer 3 and transmits the signal to the integrated processing control system. In the non-grounded neutral mode, neither the high voltage switch 7 nor the third high voltage disconnector 14 is closed.
The method of the present invention can be implemented based on the circuit of the processing system, and in conjunction with fig. 1-3, the switching of the grounding modes in steps S3 and S5 can be realized by opening and closing the switch.
The invention has the beneficial effects that: and comprehensively utilizing the three grounding operation modes to make up for the deficiencies, judging the system state in real time by utilizing a comprehensive processing control system, and putting the system into a proper grounding operation mode.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a single-phase ground connection processing system of middling pressure, includes the generating line and connects n parallelly connected branch roads of generating line, each the branch road all is equipped with current transformer and pulse signal acquisition unit, pulse signal acquisition unit is used for gathering current transformer's pulse signal, its characterized in that: the system also comprises a monitoring wave recording system, a comprehensive processing control system and a signal injection system;
the signal injection system is used for constructing a grounding mode of the bus, including but not limited to ungrounded neutral points and grounding through a resistor;
the monitoring and wave recording system comprises a first high-voltage isolating switch, a first high-voltage fuse and a broadband voltage sensor which are connected in series, wherein the first high-voltage isolating switch is connected with a bus, the broadband voltage sensor is grounded, the broadband voltage sensor reduces the high voltage of the bus into low voltage and transmits a monitoring signal to a monitoring controller, and the monitoring controller analyzes the fault information and transmits the fault information to the comprehensive processing control system;
the comprehensive processing control system is used for constructing an arc suppression coil grounding mode of a bus, receiving and processing pulse signals and fault information, selecting a proper grounding mode from neutral point ungrounded, arc suppression coil grounding and resistance grounding, sending a control command to the signal injection system, and recovering the neutral point ungrounded after the grounding fault disappears.
2. The medium voltage single phase grounding processing system according to claim 1, wherein: the comprehensive treatment control system comprises a second high-voltage isolating switch, a second high-voltage fuse, a vacuum contactor, a first grounding current transformer, an arc suppression coil, a second grounding current transformer and a main controller, the second high-voltage isolating switch, the second high-voltage fuse, the vacuum contactor and the first grounding current transformer are sequentially connected in series, the arc suppression coil and the second grounding current transformer are connected in series, the second high-voltage isolating switch is connected with a bus, the first grounding current transformer and the second grounding current transformer are grounded, the main controller is respectively connected with the second high-voltage isolating switch, the second high-voltage fuse, the vacuum contactor, the first grounding current transformer, the arc suppression coil and the second grounding current transformer in an electric connection mode, and the monitoring controller transmits an analysis result to the main controller.
3. The medium voltage single phase grounding system according to claim 2, wherein: the signal injection system comprises a grounding transformer, a third high-voltage isolating switch, a third high-voltage fuse, a voltage transformer and a high-voltage switch, wherein one end of the third high-voltage isolating switch is connected with a bus, the other end of the third high-voltage isolating switch is respectively connected with one end of the third high-voltage fuse and the grounding transformer, the other end of the third high-voltage fuse is connected with one end of the voltage transformer, the other end of the voltage transformer is respectively connected with an arc suppression coil and the high-voltage switch, and the high-voltage switch is grounded through a resistor; the main controller is respectively electrically connected with the third high-voltage isolating switch, the third high-voltage fuse, the voltage transformer and the high-voltage switch.
4. The medium voltage single phase grounding system according to claim 2, wherein: and the monitoring and wave recording system transmits the collected fault information to the main controller through optical fiber communication.
5. A medium-voltage single-phase grounding processing method is characterized in that a medium-voltage power grid comprises a bus and a plurality of parallel branches connected with the bus, and the method specifically comprises the following steps:
s1, the monitoring and wave recording system collects system fault information and sends the system fault information to the comprehensive processing control system;
s2, judging whether there is earth fault, if yes, executing the next step, otherwise repeating the step S1;
s3, setting the grounding mode of the neutral point as arc suppression coil grounding;
s4, judging whether the ground fault disappears, if so, returning to the step S1, otherwise, executing the next step;
s5, putting a resistor to be grounded on the basis of grounding of the arc suppression coil, screening out a fault grounded branch and giving an alarm;
s6, judging whether the ground fault disappears, if so, returning to the step S1 after the ground fault is successfully recovered, judging the ground fault to be an instantaneous ground fault, otherwise, executing the next step;
s7, the comprehensive processing control system converts the arc grounding into metal grounding, short-circuits grounding capacitance current and sends out an alarm signal;
and S8, checking whether the fault-grounded branch is normal, and repeating the step S1.
6. The medium-voltage single-phase grounding processing method according to claim 5, characterized in that: in step S1, the branch is set to be a neutral point ungrounded mode to monitor fault information of the collecting bus and the branch of the recording system, a current transformer is set on the branch, and the broadband signal collecting unit collects broadband signals of the current transformer and transmits the signals to the integrated processing control system.
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| CN201910919022.0A CN110797854A (en) | 2019-09-26 | 2019-09-26 | Medium-voltage single-phase grounding processing system and method |
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| CN201910919022.0A CN110797854A (en) | 2019-09-26 | 2019-09-26 | Medium-voltage single-phase grounding processing system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310953A (en) * | 2020-11-27 | 2021-02-02 | 芜湖科越电气有限公司 | Overvoltage comprehensive control and arc suppression coil ground fault management system |
| CN113805095A (en) * | 2021-08-24 | 2021-12-17 | 安徽广聚电力自动化技术有限公司 | Ultrahigh frequency intelligent inspection system |
-
2019
- 2019-09-26 CN CN201910919022.0A patent/CN110797854A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310953A (en) * | 2020-11-27 | 2021-02-02 | 芜湖科越电气有限公司 | Overvoltage comprehensive control and arc suppression coil ground fault management system |
| CN113805095A (en) * | 2021-08-24 | 2021-12-17 | 安徽广聚电力自动化技术有限公司 | Ultrahigh frequency intelligent inspection system |
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Application publication date: 20200214 |
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