CN108241105A - A kind of test method of the arc grounding line selection apparatus based on RTDS - Google Patents
A kind of test method of the arc grounding line selection apparatus based on RTDS Download PDFInfo
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- CN108241105A CN108241105A CN201711293493.2A CN201711293493A CN108241105A CN 108241105 A CN108241105 A CN 108241105A CN 201711293493 A CN201711293493 A CN 201711293493A CN 108241105 A CN108241105 A CN 108241105A
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- rtds
- arc grounding
- line selection
- selection apparatus
- grounding line
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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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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of test methods of the arc grounding line selection apparatus based on RTDS; construct a closed loop environment tested based on RTDS arc grounding line selection apparatus; in this simulated environment; it can be according to the electric power primary system network of protection installation place; create identical mathematical model therewith; the test method specific aim, customization are stronger, and test environment is truer；RTDS is as digital moving die testing tool, it exports electrical quantity and includes transient state component, waveform is closer to the waveform in power grid during true fault, various types of short troubles can be simulated, pass through building for control logic, fault waveform during intermittent arc grounding more can be really restored, completes the test to arc grounding line selection apparatus.Using the test method, the operational reliability after the arc grounding route selection scene of putting is put into operation can be greatly improved.
Description
Technical field
The present invention relates to a kind of test methods of the arc grounding line selection apparatus based on RTDS, belong to protecting electrical power system dress
Put technical field of measurement and test.
Background technology
Small current neutral grounding system refers to isolated neutral, the power train through grounding through arc or through high grounding
System, most domestic 66kV and following power grid all use this mode of connection.Singlephase earth fault is in small current neutral grounding system
The probability of malfunction of middle generation is highest, however when singlephase earth fault occurs for system due to not forming short-circuit loop,
Earth-fault current is smaller than load current, while three-phase line voltage symmetric relation under such fault condition still maintains, no
The continuous power supply to load is influenced, so not requiring to trip immediately, but phase voltage raising caused by this failure is to the exhausted of system
Edge performance poses a great threat, and in the place of power grid weakness it is also possible to inducing another point ground connection, forms two-phase grounding fault,
It in this way will be than more serious to the injury of system.
In recent years, in order to push the process of the process of urban modernization and Speeding Township urbanization, China's urban distribution network
It is all improved always in constantly development with rural power grids, net capacity and total line length are all being continuously increased, while each
Cable run, which is obtained for, in power grid is widely applied popularization, and the gas insulated substation of totally-enclosed SF6 also extensively should
With all of these factors taken together is all in the capacitive earth current for increasing power distribution network.And the increase of capacitance current allows for single-phase earthing
Shi Buneng and original equally reliable blow-out, so as to which failure can be made to be further expanded to alternate short circuit and then breaker is caused to be jumped
Lock.In addition, the harm of intermittent arc grounding overvoltage cannot equally be ignored caused by the same time, it threatens electrical equipment
Insulation, switch can be made to explode so that the load of metallic oxide lightning arrestor movement increases and influences the safety of power grid, has
When can even transformer coil be caused to deform, cause heavy losses.For this purpose, electrician author in over-voltage and connects both at home and abroad
Ground protection etc. is studied, it is desirable to be able to the number that the arc resistance fault electric arc of single-phase earthing is restriked is reduced to the maximum extent,
Blow-out as early as possible is allowed to, also, wishes to select faulty line as early as possible to exclude event in time after arc grounding occurs for power distribution network
Barrier, that is to say, that arc grounding line selection apparatus, which should have, quickly selects faulty line, and the function that faulty section is cut off.
Invention content
Running environment when can accurately simulate arc grounding failure the technical problem to be solved by the invention is to provide one kind
Test method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of test method of the arc grounding line selection apparatus based on RTDS, test device include RTDS systems, power amplifier
And arc grounding line selection apparatus；
Test method includes the following steps：
Step 1：According to the electric power primary system network of protection installation place, the mathematical model of each element is created in RSCAD, it is defeated
Enter relevant parameter；
Step 2：The simulated grid of electric power primary system is built in RTDS；
Step 3：RTDS analog outputs end with power amplifier input is connect, power amplifier output and arc light are connect
The analog input end connection of ground line selection apparatus, the electric state amount calculated for real-time Transmission RTDS；
Step 4：By the circuit breaker position of branch each in simulated grid and arc grounding line selection apparatus position of the switch input module phase
Even, the tripping outlet by arc grounding line selection apparatus and the trip signal of RTDS are adopted into connecting, arc grounding line selection apparatus according to
Collected analog quantity variation judges guilty culprit branch, and send out trip signal, after RTDS systems receive tripping pulse, jumps
The breaker of respective branch is opened, thus forms a closed-loop system；
Step 5：Build intermittent arc grounding fault logic；
Step 6：The intermittent arc grounding failure of various branches is simulated, tests the route selection of arc grounding line selection apparatus and action feelings
Condition.
The intermittent arc grounding fault logic is logic " with door ", including three input terminals, be respectively fault logic,
Intermittent logic and arc light logic,
Build fault logic：When each branch of system breaks down, which generates a pulse signal T4；
Build intermittent logic：N power frequency period is connected, and m power frequency period shutdown, n, m combination take certain value, in RSCAD
One frequency of generation is 10Hz, the square wave that peak value is 1, and square-wave signal is named as WAVE1；
Build arc light logic：In every half of power frequency period, connected after voltage is more than specified value U1, less than being closed after specified value U2
Disconnected, U1, U2 take certain value, and a sine wave is generated in RSCAD, are named as WAVE2, define a variable HG, calculate WAVE2
Sine function F（x）, logic is built, from F（x）Timing when value bears positive zero crossing in one power frequency period, works as F（x）-
When U1 values are by bearing positive zero passage, HG outputs 1；Work as F（x）- U2 values are by just to during negative variation, HG exports 0；Work as F（x）+ U1 values by
When just to negative zero passage, F is worked as in HG outputs 1（x）+ U2 values are by bearing timing, HG outputs 0；
" with door " logic, input terminal T4, WAVE1, HG are built, output signal is named as FLT, it can be achieved that intermittence occurs for branch
Characteristic during arc grounding failure.
U1 values 0.9（Perunit value）, U2 values 0.2（Perunit value）, U1=0.9 is equivalent to 64.16 ° of the angle of flow, the phase of U2=0.2
When in 168.5 ° of angle of shutdown.
N, desirable n=3 of m combinations, m=2 or n=3, m=1 or n=2, m=1 or n=1, m=1.
Analog quantity includes the residual voltage of busbar and two sub-value of zero-sequence current of each branch.
Electric state amount includes transient state component and steady-state component.
The advantageous effect that the present invention is reached：
1st, by RTDS for test to arc grounding line selection apparatus, can according to the electric power primary system network of protection installation place,
Identical mathematical model therewith is created, the test method specific aim, customization are stronger, and test environment is truer；
2nd, a closed loop test environment is constituted between RTDS, power amplifier, tested arc grounding line selection apparatus, it can be preferably
Electrical quantity between model of realization device and system interacts, and the parameter of a model can be required according to actual field in RTDS
And set, system is more flexible and changeable；
3rd, dynamic analog draws up state when intermittent arc grounding failure occurs for system, and RTDS more can accurately export electrical quantity
Comprising transient state component, waveform improves what arc grounding line selection apparatus was tested closer to the waveform in power grid during true fault
Accuracy.
Description of the drawings
Fig. 1 is the primary system wiring diagram of the arc grounding line selection apparatus test method provided by the invention based on RTDS；
Fig. 2 is the closed loop wiring signal that the arc grounding line selection apparatus test platform provided by the invention based on RTDS is provided
Figure；
Fig. 3 is the logic signal of the arc grounding line selection apparatus test method intermittent arc light provided by the invention based on RTDS
Figure.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
A kind of test method of the arc grounding line selection apparatus based on RTDS, test device includes RTDS systems, power is put
Big device and arc grounding line selection apparatus；
Test method includes the following steps：
Step 1：According to the electric power primary system network of protection installation place, as shown in Figure 1, S1, S2 are 110kV equivalent power supplies, it is main
Becoming on T1, T2 secondary 35kV busbares respectively has 4 outlets, and wherein L1, L2, L3, L4 is 1M busbar branches, L12, L13, L14, L15
For 2M busbar branches.K1~K26 is trouble point, and wherein K1, K14 is respectively the trouble point on 1M, 2M busbar, remaining is each branch
Head end, midpoint, end trouble point.What 1M, 2M voltage were adopted respectively is the voltage value of PT1, PT2, and SK1~SK8 is adopted respectively
The current value of CT1~CT8 creates the mathematical model of each element in RSCAD, inputs relevant parameter；
Step 2：The simulated grid of electric power primary system is built in RTDS；
Step 3：RTDS analog outputs end with power amplifier input is connect, power amplifier output and arc light are connect
The analog input end connection of ground line selection apparatus, for the electric state amount that real-time Transmission RTDS is calculated, during experiment, power
The residual voltage signal of 2 upper voltage transformers of busbar PT1, PT2 and each branch CT1~CT8 in amplifier acquisition RTDS models
Current transformer zero sequence current signal after be amplified, and continuous output in real time, by amplified residual voltage and zero
Two sub-value of sequence current signal inputs to arc grounding line selection apparatus；
Step 4：By the circuit breaker position of branch each in simulated grid and arc grounding line selection apparatus position of the switch input module phase
Even, the tripping outlet of arc grounding line selection apparatus is adopted with the trip signal of RTDS into connecting, in test process, when branch road is sent out
During raw intermittent arc grounding failure, transient current during failure through power amplifier can be exported and be filled to arc grounding route selection by system
It puts, waveform when arc grounding line selection apparatus is according to collected failure judges guilty culprit branch, and sends out tripping letter
Number, after RTDS systems receive tripping pulse, thus the breaker of tripping respective branch forms a closed-loop system；
Step 5：Intermittent arc grounding fault logic is built,
Intermittent arc grounding fault logic is logic " with door ", is that fault logic, intermittence are patrolled respectively including three input terminals
Volume and arc light logic,
Build fault logic：When each branch of system breaks down, which generates a pulse signal T4；
Build intermittent logic：N power frequency period is connected, m power frequency period shutdown, n, m combination can use n=3, m=2 or n=3, m=
1 or n=2, m=1 or n=1, m=1, generated in RSCAD a frequency be 10Hz, the square wave that peak value is 1, the duty ratio of square wave is
0.5 or 0.6 or 0.667 or 0.75, square-wave signal is named as WAVE1；
Build arc light logic：In every half of power frequency period, connected after voltage is more than specified value U1, less than being closed after specified value U2
It is disconnected, U1 values 0.9（Perunit value）, U2 values 0.2（Perunit value）, U1=0.9 is equivalent to 64.16 ° of the angle of flow, and U2=0.2 is equivalent to
Turn off 168.5 ° of angle, generated in RSCAD a frequency be 50Hz, the sine wave that amplitude is 1, be named as WAVE2, define one
A variable HG calculates the sine function F of WAVE2（x）, logic is built, from F（x）Timing when value bears positive zero crossing, one
In power frequency period, work as F（x）When-U1 values are by bearing positive zero passage, HG outputs 1；Work as F（x）- U2 values are by just to during negative variation, HG is defeated
Go out 0；Work as F（x）+ U1 values are by just to when bearing zero passage, F is worked as in HG outputs 1（x）+ U2 values are by bearing timing, HG outputs 0；
" with door " logic, input terminal T4, WAVE1, HG are built, output signal is named as FLT, it can be achieved that intermittence occurs for branch
Characteristic during arc grounding failure；
Step 6：The intermittent arc grounding failure of various branches is simulated, tests the route selection of arc grounding line selection apparatus and action feelings
Condition.
In embodiment provided herein, it should be understood that disclosed system and method can pass through others
Mode is realized.For example, system embodiment described above is only schematical, for example, the division of the unit, only
A kind of division of logic function, can there is an other dividing mode in actual implementation, for example, multiple units or component can combine or
Person is desirably integrated into another system or some features can be ignored or does not perform.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, device or unit
It connects, can be electrical, machinery or other forms.
Professional further appreciates that, with reference to each exemplary unit of the embodiments described herein description
And algorithm steps, can be realized with the combination of electronic hardware, computer software or the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is performed actually with hardware or software mode, specific application and design constraint depending on technical solution.Profession
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
It can directly be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory（RAM）, memory, read-only deposit
Reservoir（ROM）, electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of test method of the arc grounding line selection apparatus based on RTDS, it is characterized in that, test device include RTDS systems,
Power amplifier and arc grounding line selection apparatus；
Test method includes the following steps：
Step 1：According to the electric power primary system network of protection installation place, the mathematical model of each element is created in RSCAD, it is defeated
Enter relevant parameter；
Step 2：The simulated grid of electric power primary system is built in RTDS；
Step 3：RTDS analog outputs end with power amplifier input is connect, power amplifier output and arc light are connect
The analog input end connection of ground line selection apparatus, the electric state amount calculated for real-time Transmission RTDS；
Step 4：The circuit breaker position of branch each in simulated grid and arc grounding line selection apparatus position of the switch input module are connected
Connect, the tripping outlet and the trip signal of RTDS by arc grounding line selection apparatus are adopted into connecting, arc grounding line selection apparatus according to
Collected analog quantity variation judges guilty culprit branch, and send out trip signal, after RTDS systems receive tripping pulse, jumps
The breaker of respective branch is opened, thus forms a closed-loop system；
Step 5：Build intermittent arc grounding fault logic；
Step 6：The intermittent arc grounding failure of various branches is simulated, tests the route selection of arc grounding line selection apparatus and action feelings
Condition.
2. a kind of test method of arc grounding line selection apparatus based on RTDS according to claim 1, it is characterized in that, institute
It is logic " with door " to state intermittent arc grounding fault logic, is fault logic, intermittent logic respectively including three input terminals
And arc light logic,
Build fault logic：When each branch of system breaks down, which generates a pulse signal T4；
Build intermittent logic：N power frequency period is connected, and m power frequency period shutdown, n, m combination take certain value, in RSCAD
A square wave is generated, square-wave signal is named as WAVE1；
Build arc light logic：In every half of power frequency period, connected after voltage is more than specified value U1, less than being closed after specified value U2
Disconnected, U1, U2 take certain value, and a sine wave is generated in RSCAD, are named as WAVE2, define a variable HG, calculate WAVE2
Sine function F（x）, logic is built, from F（x）Timing when value bears positive zero crossing in one power frequency period, works as F（x）-
When U1 values are by bearing positive zero passage, HG outputs 1；Work as F（x）- U2 values are by just to during negative variation, HG exports 0；Work as F（x）+ U1 values by
When just to negative zero passage, F is worked as in HG outputs 1（x）+ U2 values are by bearing timing, HG outputs 0；
" with door " logic, input terminal T4, WAVE1, HG are built, output signal is named as FLT, it can be achieved that intermittence occurs for branch
Characteristic during arc grounding failure.
3. a kind of test method of arc grounding line selection apparatus based on RTDS according to claim 2, it is characterized in that, U1
Value 0.9（Perunit value）, U2 values 0.2（Perunit value）, U1=0.9 is equivalent to 64.16 ° of the angle of flow, and U2=0.2 is equivalent to shutdown angle
168.5°。
4. a kind of test method of arc grounding line selection apparatus based on RTDS according to claim 2, it is characterized in that, n,
Desirable n=3 of m combinations, m=2 or n=3, m=1 or n=2, m=1 or n=1, m=1.
5. a kind of test method of arc grounding line selection apparatus based on RTDS according to claim 1, it is characterized in that, mould
Analog quantity includes the residual voltage of busbar and two sub-value of zero-sequence current of each branch.
6. a kind of test method of arc grounding line selection apparatus based on RTDS according to claim 1, it is characterized in that, electricity
Gaseity amount includes transient state component and steady-state component.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983137A (en) * | 2018-07-23 | 2018-12-11 | 济南置真电气有限公司 | A kind of system and method for detection single-phase earth fault line selection tripping round cut reliability |
| WO2020181982A1 (en) * | 2019-03-12 | 2020-09-17 | 南京南瑞继保电气有限公司 | Distributed grounding line selection system and method |
| CN111736091A (en) * | 2020-05-27 | 2020-10-02 | 湖南省湘电试验研究院有限公司 | Unstable high-resistance ground fault simulation circuit based on RTDS platform and application method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435970A (en) * | 2011-09-14 | 2012-05-02 | 广西电网公司电力科学研究院 | Test scheme for line selection function of small-current ground system single-phase ground fault line selection device |
| CN102654549A (en) * | 2011-03-03 | 2012-09-05 | 华东电力试验研究院有限公司 | Parallel line fault simulation analysis platform based on real-time digital simulator |
| CN202471887U (en) * | 2012-01-09 | 2012-10-03 | 广西电网公司电力科学研究院 | Injection type small current grounding line selection device RTDS closed loop test platform |
| CN103235218A (en) * | 2013-04-16 | 2013-08-07 | 国家电网公司 | RTDS-based (real-time digital simulator) arc protector function test platform |
| CN105403810A (en) * | 2015-12-03 | 2016-03-16 | 国网山东省电力公司电力科学研究院 | Universal testing system and method of line selection apparatus of low-current grounding system |
| CN205544259U (en) * | 2016-04-22 | 2016-08-31 | 国家电网公司 | Single -phase arc light ground connection analogue means of distribution network |
-
2017
- 2017-12-08 CN CN201711293493.2A patent/CN108241105B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654549A (en) * | 2011-03-03 | 2012-09-05 | 华东电力试验研究院有限公司 | Parallel line fault simulation analysis platform based on real-time digital simulator |
| CN102435970A (en) * | 2011-09-14 | 2012-05-02 | 广西电网公司电力科学研究院 | Test scheme for line selection function of small-current ground system single-phase ground fault line selection device |
| CN202471887U (en) * | 2012-01-09 | 2012-10-03 | 广西电网公司电力科学研究院 | Injection type small current grounding line selection device RTDS closed loop test platform |
| CN103235218A (en) * | 2013-04-16 | 2013-08-07 | 国家电网公司 | RTDS-based (real-time digital simulator) arc protector function test platform |
| CN105403810A (en) * | 2015-12-03 | 2016-03-16 | 国网山东省电力公司电力科学研究院 | Universal testing system and method of line selection apparatus of low-current grounding system |
| CN205544259U (en) * | 2016-04-22 | 2016-08-31 | 国家电网公司 | Single -phase arc light ground connection analogue means of distribution network |
Non-Patent Citations (1)
| Title |
|---|
| 杨佳 等: "一种基于RTDS的消弧选线装置的实验研究", 《江苏电机工程》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983137A (en) * | 2018-07-23 | 2018-12-11 | 济南置真电气有限公司 | A kind of system and method for detection single-phase earth fault line selection tripping round cut reliability |
| WO2020181982A1 (en) * | 2019-03-12 | 2020-09-17 | 南京南瑞继保电气有限公司 | Distributed grounding line selection system and method |
| CN111736091A (en) * | 2020-05-27 | 2020-10-02 | 湖南省湘电试验研究院有限公司 | Unstable high-resistance ground fault simulation circuit based on RTDS platform and application method thereof |
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| CN108241105B (en) | 2020-04-28 |
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