CN110609202A - 10-66kV distribution network intermittent arc light grounding true-mode simulation test device - Google Patents
10-66kV distribution network intermittent arc light grounding true-mode simulation test device Download PDFInfo
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- CN110609202A CN110609202A CN201910973354.7A CN201910973354A CN110609202A CN 110609202 A CN110609202 A CN 110609202A CN 201910973354 A CN201910973354 A CN 201910973354A CN 110609202 A CN110609202 A CN 110609202A
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- 238000009826 distribution Methods 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 36
- 239000004973 liquid crystal related substance Substances 0.000 claims description 8
- 238000002955 isolation Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
Classifications
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
-
- 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
Abstract
The invention discloses a 10-66kV distribution network intermittent arc light grounding true mode simulation test device which comprises an MCU processing unit, a key board, a switching value output unit and an intermittent arc light grounding trigger unit connected between a phase line and the ground in a distribution network; the input end of the MCU processing unit is connected with a key board for inputting control conditions, and the output end of the MCU processing unit is connected with the controlled end of the intermittent arc grounding trigger unit through the switching value output unit. The arc grounding fault simulation device has a simple structural form, can truly and reliably simulate the intermittent arc grounding fault of the distribution network, can control the phase angle of the arc grounding fault, the duration of single arc and the interval time of each arc, can meet the experimental requirements of different arc grounding faults, and provides a reliable basis for researching the grounding fault of a power system.
Description
Technical Field
The invention relates to the technical field of power system fault state simulation, in particular to a test device for simulating intermittent arc grounding of a distribution network.
Background
In the power system fault, the single-phase arc grounding overvoltage has destructiveness on a power distribution network pole, and the research and configuration of the single-phase arc grounding fault test model in the distribution network test platform have important significance on the analysis of the intermittent arc grounding fault.
At present, there are two common ways to realize artificial single-phase arc ground fault: one is a high-voltage power electronic switch implementation mode, the arc grounding test equipment based on the high-power thyristor is characterized in that the thyristor is conducted at any angle by triggering a pulse signal, an arc firing phase angle is controlled, and arc quenching is realized by using a thyristor current zero-crossing turn-off and magnetic blow type arc extinguishing device, so that the arc grounding phenomenon with controllable discharge frequency and discharge phase is simulated really; however, the power electronic series connection working failure rate is too high, the reliability is poor, the reverse cut-off characteristic of the high-power thyristor can only allow a unidirectional pulse waveform, but the high-frequency oscillation waveform cannot be reproduced, and the obtained test waveform is seriously deviated from the real situation. The other is a high-voltage magnetic control switch implementation mode, which utilizes the advantage of high motion speed of the reed switch to realize a frequency-adjustable and phase angle-controllable grounding test by controlling an electromagnetic field, but through the understanding of the technical parameters of reed switch products, although the working frequency is high, the withstand voltage can also reach 14kV (peak value), the power is too small, and basically no products above 100VA exist. Therefore, the two schemes are not ideal.
Disclosure of Invention
The invention aims to provide a 10kV-66kV distribution network intermittent arc light grounding true mode simulation test device with controllable frequency and phase angle, which is used for reliably and stably carrying out distribution network intermittent arc light grounding faults and provides a basis for the research of power system grounding faults.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A10-66 kV distribution network intermittent arc light grounding true mode simulation test device comprises an MCU processing unit, a key board, a switching value output unit and an intermittent arc light grounding trigger unit connected between a phase line and the ground in a distribution network; the input end of the MCU processing unit is connected with a key board for inputting control conditions, and the output end of the MCU processing unit is connected with the controlled end of the intermittent arc grounding trigger unit through the switching value output unit.
The intermittent arc grounding trigger unit has the specific structure that the intermittent arc grounding trigger unit comprises a plurality of groups of series switch branches arranged in parallel, and each series switch branch comprises an arc grounding starting phase angle control switch and an arc grounding ending phase angle control switch which are connected in series; the arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch in each series switch branch circuit are independently controlled by the switching value output unit under the instruction of the MCU processing unit respectively.
The improvement of the intermittent arc grounding trigger unit is as follows: the arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch are contacts of the independent relay respectively.
The invention is further improved in that: the intermittent arc grounding trigger unit comprises five groups of series switch branches which are arranged in parallel.
The improvement of the invention is that: and the output end of the MCU processing unit is connected with a liquid crystal display screen through a liquid crystal driving circuit.
As the optimization of the invention: the input end of the MCU processing unit is connected with a switching value input unit for acquiring the switching state of each switching element in the intermittent arc grounding trigger unit, and the output end of the MCU processing unit is connected with a fault indication unit for sending out fault alarm.
As the optimization of the invention: the input end of the MCU processing unit is connected with an analog signal acquisition unit for acquiring voltage signals in the analog distribution network.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The arc grounding fault simulation device has a simple structural form, can truly and reliably simulate the intermittent arc grounding fault of the distribution network, can control the phase angle of the arc grounding fault, the duration time of single arc and the interval time of each arc, can meet the experimental requirements of different arc grounding faults, has a wide experimental range, and provides a reliable foundation for researching the grounding fault of a power system.
Drawings
FIG. 1 is an electrical schematic of the present invention;
FIG. 2 is a timing diagram of the opening and closing of two series switches in a branch of the series switch according to the present invention;
fig. 3 is an electrical schematic diagram between the MCU processing unit and the switching value input unit, the switching value output unit, and the analog signal acquisition unit in the embodiment.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
An electrical principle of the 10-66kV distribution network intermittent arc grounding real-mode simulation test device is shown in figure 1 and comprises an MCU processing unit, a key board, a switching value input unit, a switching value output unit, an intermittent arc grounding trigger unit, an analog signal acquisition unit, a liquid crystal display screen and a fault indication unit; the input end of the MCU processing unit is respectively connected with the output ends of the key board, the switching value input unit and the analog signal acquisition unit, the output end of the MCU processing unit is connected with the controlled end of the intermittent arc grounding trigger unit through the switching value output unit, and the output end of the MCU processing unit is also respectively connected with the controlled end of the liquid crystal display and the controlled end of the fault indication unit.
The key board is used for inputting control conditions to the MCU processing unit according to experimental conditions, and the control conditions comprise the occurrence phase angle of simulated arc grounding, the duration of single arc, the time interval between each arc occurrence and the like. The core component of the MCU processing unit is an MCU processor.
The intermittent arc grounding trigger unit is connected between a phase line A and a ground GND in a distribution network, as shown in FIG. 1; the arc grounding starting phase angle control switch is a normally open switch, and the arc grounding ending phase angle control switch is a normally closed switch; the arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch in each series switch branch circuit are independently controlled by the switching value output unit under the instruction of the MCU processing unit respectively. The arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch are contacts of an independent relay respectively.
The invention relates to a series switch branch circuit, which is characterized in that a single switch can send a breaking command after being closed for a certain time under the influence of the performance of a relay, and the series switch branch circuit adopts a structure that two switches are connected in series, so that the limitation of the anti-tripping function of the single switch can be solved, the limitation of breaking delay on the breaking moment of the switch can be avoided, the starting phase angle control of arc grounding is realized by the single switch, the ending phase angle control of the arc grounding is realized by the single switch, and the random control of the single arc phase angle and the duration time is realized. In addition, the invention adopts a mode that a plurality of groups of series-connected switch branches are arranged in parallel, each group is independently controlled and acts in sequence according to a set sequence, and the simulation of the intermittent earth fault with controllable interval time of each arc light can be realized.
Since the device functionality is limited by the energy storage time, the total duration of the very fast intermittent arc grounding is then related to the number of series switching legs. The invention considers the charging and discharging time of the earth capacitance of the power distribution network, the combination of the rated voltage of 10-66kV and the rated voltage of 1250A, the time interval frequency of the repeated grounding is not less than 100Hz, the research time is not less than 100ms, the calculation is carried out according to the maximum 50Hz frequency of the fault and the recovery in the intermittent arc grounding process, and the intermittent arc grounding trigger unit comprises five groups of series switch branches which are arranged in parallel.
Fig. 1 shows that the intermittent arc ground trigger unit of the present invention comprises a first series switch branch consisting of an arc ground start phase angle control switch K11 and an arc ground end phase angle control switch K12 connected in series, a second series switch branch consisting of an arc ground start phase angle control switch K21 and an arc ground end phase angle control switch K22 connected in series, a third series switch branch consisting of an arc ground start phase angle control switch K31 and an arc ground end phase angle control switch K32 connected in series, and an nth series switch branch consisting of an arc ground start phase angle control switch KN1 and an arc ground end phase angle control switch KN2 connected in series.
And after the MCU processing unit analyzes the experiment requirement, a control instruction is sent to the switching value output unit, and the switching value output unit further controls the intermittent arc grounding trigger unit to simulate arc grounding. In this embodiment, as shown in fig. 3, the circuit of the on-light output unit includes a driving circuit connected to each series switch branch, and the driving circuit mainly includes an optical coupling isolation module OPo and a 24V power supply branch connected to two ends of the relay coil; one end of the input end of the optical coupling isolation module OPo is connected with a power supply of 3.3V, and the other end is connected with a KO pin of the MCU processor; one end of the power supply branch is connected with the output end of the optical coupling isolation module, and the other end of the power supply branch is grounded.
During and after the intermittent arc grounding trigger unit acts, the state signals of the switches in the intermittent arc grounding trigger unit are collected through the light-on input unit and are sent to the MCU processing unit, and the MCU processing unit processes the state signals collected by the switching input unit and sends the processed state signals to the liquid crystal display screen for display. In this embodiment, a circuit diagram of the switching value input unit is as shown in fig. 3, and includes signal processing branches connected to each series switch branch, where the signal processing branches mainly include an LC filter circuit and an opto-isolation module OPi, an input end of the LC filter circuit is connected to the intermittent arc grounding trigger unit, an output end of the LC filter circuit is connected to an input end of the opto-isolation module OPi, and an output end of the opto-isolation module OPi is connected to an INO pin of the MCU processor.
In the invention, the input end of the MCU processing unit is connected with an analog signal acquisition unit for acquiring voltage signals in an analog distribution network, and the output end of the MCU processing unit is connected with a fault indication unit for sending out fault alarm. In an embodiment, a circuit diagram of the analog signal acquisition unit is shown in fig. 3, and includes a signal isolation transformer T and a cascaded operational amplifier AMP connected to a secondary side of the signal isolation transformer, an output end of the secondary operational amplifier is connected to an analog quantity acquisition end ADC of the MCU processor, and an analog quantity signal is isolated by the signal isolation transformer T, subjected to signal conversion, and then processed by a secondary operational amplifier and enters the MCU processor.
The input end of the liquid crystal display screen is connected with the output end of the MCU processing unit, and the state of the intermittent arc grounding fault can be displayed. When the fault occurs, the MCU processing unit can also send out a fault alarm through the fault indication unit.
When the invention is used for carrying out a single-phase arc grounding experiment, taking the first series switch branch as an example, the time states of the phase angle and the arc duration are controlled as shown in fig. 2, and the specific steps are as follows: at the time 0, an opening action command is sent to an arc grounding initial phase angle control switch K11, and the time period T1 is K11 switch closing action delay time; at the time T1, a closing action command is sent to the arc grounding initial phase angle control switch K11, and the time period T3 is the closing time of the switch K11; at the time 0, a closing action command is sent to the arc grounding end phase angle control switch K12 switch, a time period T2 is K12 switch opening action delay time, and at the time T2, an opening action command is sent to the arc grounding end phase angle control switch K11 switch; the arc ends at time t 3. In the control process, the time period of the arc grounding starting phase angle control switch K11 and the arc grounding ending phase angle control switch K12 in the closed state at the same time is t2-t1, so the starting phase angle time of the circuit for single arc grounding is t1, the phase angle time of grounding ending is t2, and the arc duration is t2-t 1. Thus, the phase angle time at which arc grounding begins can be determined by controlling the on time of the arc grounding start phase angle control switch, the phase angle time at which arc grounding ends can be determined by controlling the off time of the arc grounding end phase angle control switch, and the time for arc duration can be controlled by controlling the time at which the arc grounding start phase angle control switch and the arc grounding end phase angle control switch are both in a closed state.
Then, the action states of other series switch branches can be respectively controlled according to intermittent experimental requirements, so that the control simulation of the occurrence phase angle of different arc grounding faults, the duration of single arc and the interval time of each arc is realized.
Of course, the arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch in the series switch branch circuit can be both normally closed switches or normally closed switches, or the arc grounding starting phase angle control switch can be a normally closed switch and the arc grounding ending phase angle control switch can be a normally open switch; when controlling the occurrence phase angle and the single arc duration of different arc ground faults, the control can be carried out according to the experimental requirements of the switch state and the input of the key board.
Claims (7)
1. The utility model provides a 10-66kV joins in marriage net intermittent type nature arc light ground connection true mode analogue test device which characterized in that: the device comprises an MCU processing unit, a key board, a switching value output unit and an intermittent arc grounding trigger unit connected between a phase line and the ground in a distribution network; the input end of the MCU processing unit is connected with a key board for inputting control conditions, and the output end of the MCU processing unit is connected with the controlled end of the intermittent arc grounding trigger unit through the switching value output unit.
2. The 10-66kV distribution network intermittent arc grounding true simulation test device according to claim 1, characterized in that: the intermittent arc grounding trigger unit comprises a plurality of groups of series switch branches arranged in parallel, and each series switch branch comprises an arc grounding starting phase angle control switch and an arc grounding ending phase angle control switch which are connected in series; the arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch in each series switch branch circuit are independently controlled by the switching value output unit under the instruction of the MCU processing unit respectively.
3. The 10-66kV distribution network intermittent arc grounding true simulation test device according to claim 2, characterized in that: the arc grounding starting phase angle control switch and the arc grounding ending phase angle control switch are contacts of the independent relay respectively.
4. The 10-66kV distribution network intermittent arc grounding true simulation test device according to claim 2 or 3, characterized in that: the intermittent arc grounding trigger unit comprises five groups of series switch branches which are arranged in parallel.
5. The 10-66kV distribution network intermittent arc grounding true simulation test device according to claim 1, characterized in that: and the output end of the MCU processing unit is connected with a liquid crystal display screen through a liquid crystal driving circuit.
6. The 10-66kV distribution network intermittent arc grounding true simulation test device according to claim 1, characterized in that: the input end of the MCU processing unit is connected with a switching value input unit for acquiring the switching state of each switching element in the intermittent arc grounding trigger unit, and the output end of the MCU processing unit is connected with a fault indication unit for sending out fault alarm.
7. The 10-66kV distribution network intermittent arc grounding true simulation test device according to claim 1, characterized in that: the input end of the MCU processing unit is connected with an analog signal acquisition unit for acquiring voltage signals in the analog distribution network.
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| CN201910973354.7A CN110609202A (en) | 2019-10-14 | 2019-10-14 | 10-66kV distribution network intermittent arc light grounding true-mode simulation test device |
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| CN201910973354.7A CN110609202A (en) | 2019-10-14 | 2019-10-14 | 10-66kV distribution network intermittent arc light grounding true-mode simulation test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557962A (en) * | 2020-12-02 | 2021-03-26 | 国网浙江省电力有限公司电力科学研究院 | Distribution cable true test system based on multi-dimensional digital fault inversion and application method |
| CN113219307A (en) * | 2021-07-08 | 2021-08-06 | 武汉品迅科技有限公司 | Power distribution network arc light grounding fault identification method based on current traveling wave |
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2019
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