CN108535677A - A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device - Google Patents
A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device Download PDFInfo
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- CN108535677A CN108535677A CN201810291762.XA CN201810291762A CN108535677A CN 108535677 A CN108535677 A CN 108535677A CN 201810291762 A CN201810291762 A CN 201810291762A CN 108535677 A CN108535677 A CN 108535677A
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Abstract
A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device, including host computer, slave computer, the host computer include：Three phase mains, distribution network system, earthing mode selecting module, fault simulation module, database, industrial computer communication interface.The slave computer includes at least one line selection apparatus to be measured for being preset with communication interface.The three-phase power output end is directly connected with the input terminal of the distribution network system.The earthing mode selecting module output end is connected with the input terminal of distribution network system.The fault simulation module output end is connected with the input terminal of distribution network system.The database input terminal is connected with the output end of distribution network system, and the database output end is connected with the input terminal of industrial computer communication interface.The present invention tests system, has the advantages that scheme is simple and practicable, reliability is high, at low cost, universality is strong, and test device has the advantages that small, light weight, portable.
Description
Technical field
The present invention relates to distribution system failure line selection technical fields, and in particular to a kind of low current neutral grounding system fault route selecting
The test system of the practical route selection effect of device.
Background technology
Domestic 35KV and distribution system below use small current neutral grounding mode, and singlephase earth fault is small current neutral grounding system
It unites most important failure mode.When singlephase earth fault occurs for small current neutral grounding system, non-faulting phase-to-ground voltage increases, and easily produces
Raw system resonance, and destruction is generated to the insulation of grid equipment, damage accumulation can cause Explosion of on Arrester or exhausted to a certain extent
Situations such as edge flashover, occurs.As net capacity is continuously improved in recent years and earth current constantly increases, more and more power transformations
Standing reduces the capacitance current of fault point using neutral by arc extinction coil grounding system, extinguishes electric arc, to improve network system
Power supply reliability.However, the compensating action of arc suppression coil, changes the feature of fault-signal, failure line selection difficulty is increased, is made
The route selection effect for obtaining original failure line selection scheme and device is deteriorated, and route selection accuracy reduces.In order to improve small current neutral grounding system
The accuracy of system failure line selection, many producers develop new line selection apparatus successively, and claim developed small current neutral grounding system
The accuracy of system fault line selection device has a more substantial increase.So, the fault line selection device that producer is developed how is proved
Practical route selection effect is a urgent problem to be solved, and this requires propose or develop accurately test out line selection apparatus
The testing scheme or device of practical route selection accuracy.
Currently, the scheme or device in the market for testing low current neutral grounding system fault route selecting device performance are few,
To build low current neutral grounding system fault route selecting device to test platform as major programme, the program is with a certain electric network composition
Example, builds test platform, it is contemplated that the power supply of test platform and the requirement of outer net security isolation, also can simulation system as possible may
The various fault conditions occurred, but test platform is once built, and distribution net work structure just can not be changed, this is not only real with line selection apparatus
The electric network composition of border application may not be consistent, it is also possible to cause the route selection that same line selection apparatus measures on test platform correct
Route selection accuracy when rate and line selection apparatus are applied to actual electric network system it is inconsistent as a result, in addition, program quantities it is big,
It is of high cost, the otherness of different distribution network systems cannot be taken into account, universality and scalability are relatively low.Therefore, the program only exists in
Conceptual phase, not yet large-scale popularization and application.
Invention content
That there are quantities to solve existing low current neutral grounding system fault route selecting device performance testing scheme is big, of high cost,
The problems such as universality is poor, scalability is low.The present invention provides a kind of practical route selection effect of low current neutral grounding system fault route selecting device
The test system of fruit, the system build test platform using Matlab softwares, by each 10kV distribution network systems in jurisdiction
The simulation result for the various fault conditions that may occur is stored in database, is assisted as signal source, then by the way that IPX/SPX is arranged
Industrial computer communication interface is preset communication interface with line selection apparatus to be measured and effectively connected, to carry out by view or ICP/IP protocol
Data transmission.The test system that is carried of the present invention from hardware for, have the characteristics that it is small, light-weight, portable, from entirety
For upper, there is outstanding advantages of easy to operate, universality is strong, at low cost, scalability is good.
The technical solution that the present invention takes is：
A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device, including host computer, slave computer, institute
Stating host computer includes：Three phase mains, distribution network system, earthing mode selecting module, fault simulation module, database, industrial personal computer
Communication interface.The slave computer includes at least one line selection apparatus to be measured for being preset with communication interface.
The three-phase power output end is directly connected with the input terminal of the distribution network system, for being supplied to distribution network system
Electricity.
The earthing mode selecting module output end is connected with the input terminal of distribution network system, and earthing mode selecting module is used
In from it is earth-free, through grounding through arc, resistance grounded three among select first, earthing mode as distribution network system；
The fault simulation module output end is connected with the input terminal of distribution network system, and fault simulation module is used for by the way that event is arranged
Hinder type, position, moment, duration occur, to simulate the various fault conditions that distribution network system may occur；
The database input terminal is connected with the output end of distribution network system, the database output end and industrial computer communication interface
Input terminal be connected, feature of the distribution network system under different earthing modes and different faults state is stored in database
Parameter and simulation waveform are as a result, as signal source；
The industrial computer communication interface output end presets communication interface with the line selection apparatus to be measured of slave computer and is connected, the industry control
The default communication interface of machine communication interface and line selection apparatus to be measured is established communication by IPX/SPX agreements or ICP/IP protocol and is connected
It connects；
The three phase mains, distribution network system, earthing mode selecting module, fault simulation module, database, industrial computer communication connect
Mouth is placed in an industrial personal computer, and presetting communication interface with the line selection apparatus to be measured of slave computer by industrial computer communication interface is connected
It connects, to ensure that host computer can transmit information to slave computer.
The distribution network system uses the distribution network system of 10kV, and system structure, parameter can carry out secondary modification and open
Hair.
A kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device of the present invention, technique effect is such as
Under：
What 1, the present invention was built is distribution network system simulation model, rather than the structure built by taking a kind of distribution net work structure as an example is not
Modifiable object test platform, distribution network system structure and parameter of the invention can according to the structure of practical distribution network system and
Parameter is flexibly arranged, and universality is strong, and scalability is good.
2, earthing mode module of the present invention can be specifically chosen according to the earthing mode of real system, take into account arc blowout wire
Enclose the influence to the practical route selection effect of line selection apparatus so that test result is with a high credibility, close to for practical distribution network system
When true effect.
3, it suggests plans in the present invention and only Matlab softwares and an industrial personal computer is relied on to can be realized, host computer is placed in work
Within control machine, host computer and slave computer are real by USB, RS232, RS485 communication interface and IPX/SPX, TCP/IP communications protocol
Existing data transmission, with small, light-weight, portable, quantities is small, easy to operate, at low cost, high reliability.
4：Earthing mode selecting module, can according to the small current neutral grounding mode of practical distribution system, select it is earth-free, through disappearing
Arc coil is grounded or resistance grounded pattern, takes into account influence of the arc suppression coil to device route selection effect, makes route selection effect and reality
Border situation is more consistent.
Description of the drawings
Fig. 1 is test system connection diagram of the present invention.
Specific implementation mode
As shown in Figure 1, a kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device, including：
8 two parts of host computer 7 and slave computer：Wherein host computer 7 include a three phase mains 1, a structure, Parameter adjustable power distribution network
System 2, an earthing mode selecting module 3, the failure mould that a fault type, position, time of origin, duration can be arranged
Quasi- module 4, a database 5, at least one industrial computer communication interface 6；Slave computer 8 is preset with communication interface including at least one
Line selection apparatus to be measured；The line selection apparatus to be measured of industrial computer communication interface 6 and slave computer 8 presets communication interface by the way that IPX/ is arranged
SPX or ICP/IP protocol establish communication channel.
The three phase mains 1 realizes that three phase mains 1 is as power distribution network system using Matlab softwares in the prior art
The supply network of system 2, output end are directly connected with the input terminal of distribution network system 2.
The distribution network system 2 using 10kV distribution network system, included by transformer model, busbar connecting-type
Formula, circuit number and each line length, loadtype and size etc., can flexibly build according to practical distribution network system, embody this
The features such as scheme universality is strong, scalability is good.The output result grouping of the distribution network system 2 is stored in database 5.
The earthing mode selecting module 3 is realized using Matlab softwares in the prior art, by a variety of ground connection sides
Formula is it is considered that be then encapsulated in together, the multiple terminals of setting outside package module, one by one with the earthing mode in package module
Corresponding, the switching state of each terminal corresponds to a kind of selection of earthing mode.The output end of the earthing mode selecting module 3
Be connected with the input terminal of distribution network system 2, can according to the earthing mode of practical distribution network system, from it is earth-free, through arc suppression coil
Select one as the earthing mode of distribution network system 2 among ground connection, resistance grounded three, to ensure in test line selection apparatus
When practical route selection effect, with respect to influence of the access to line selection apparatus of arc suppression coil.
The fault simulation module 4 is realized using Matlab softwares in the prior art, and distribution network system 2 is possible
The simulation model of the various fault conditions occurred is all worked it out, and is then encapsulated in together, and multiple terminals are arranged outside package module,
It is corresponded with the fault condition in package module, the switching state degree of each terminal represents the selection of corresponding fault condition.
The output end of the fault simulation module 4 is connected with the input terminal of distribution network system 2, can be by the way that fault type, position, hair is arranged
Raw moment, duration, to simulate the various fault conditions that distribution network system 2 may occur.
The database 5 is the place of storage and management data information, and the database 5 in the present invention mainly will be various
Obtained data in the case of fault simulation, such as：A phase metals have occurred in the N articles overhead transmission line head end of 10kV distribution systems
Property earth fault, and trouble duration be 30ms-300ms, at this point, the letters such as the amplitude of fault current, frequency, phase can be measured
Breath, the fault current information under this kind of failure is stored, one group of data has just been obtained；Various faults situation then corresponds to multigroup
Data, all data are just stored in database 5.The input terminal of the database 5 and the output end phase of distribution network system 2
Even, output end is connected with the input terminal of industrial computer communication interface 6, and distribution network system 2 is stored in database 5 in different ground connection sides
Formula and characteristic parameter and simulation waveform under different faults state are as a result, can be used as signal source.
The industrial computer communication interface 6, including common USB, RS-232, RS-485 interface, input terminal and database 5
Output end be connected, output end is connected with the 8 preset communication interface of line selection apparatus to be measured of slave computer.
The physical connection of the host computer 7 and slave computer 8 is pre- by industrial computer communication interface and line selection apparatus to be measured
If communication interface connects to realize；The communication of host computer with the slave computer, which connects, to be communicated by the way that IPX/SPX is arranged
Agreement or TCP/IP communications protocol are realized.
In conclusion the practical route selection measure of merit system of low current neutral grounding system fault route selecting device that the present invention is carried,
A full set of power distribution network analog network need not be built, can be realized merely with existing Matlab softwares and an industrial personal computer, engineering
Measure it is small, it is at low cost, and test device has many advantages, such as small, light weight, portable.The small current neutral grounding system that the present invention is carried
The practical route selection measure of merit system of fault line selection device, constructed power distribution network analogue system and practical distribution network system structure,
Parameter can be consistent, and when distribution network system structure changes, power grid that can flexibly in synchronous adjustment test system
Structure and parameter have the advantages that universality is high, scalability is good, are the small current neutral groundings that a kind of feasibility is strong, reliability is high
The test system of the practical route selection effect of system failure line selection apparatus.
Claims (3)
1. a kind of test system of the practical route selection effect of low current neutral grounding system fault route selecting device, including host computer（7）, it is the next
Machine（8）, it is characterised in that：The host computer（7）Including：Three phase mains（1）, distribution network system（2）, earthing mode selecting module
（3）, fault simulation module（4）, database（5）, industrial computer communication interface（6）；
The slave computer（8）Including at least one line selection apparatus to be measured for being preset with communication interface；
The three phase mains（1）Output end directly with the distribution network system（2）Input terminal be connected, for distribution network system
（2）Power supply；
The earthing mode selecting module（3）Output end and distribution network system（2）Input terminal be connected, earthing mode selecting module
（3）For from it is earth-free, through among grounding through arc, resistance grounded three select first, as distribution network system（2）Connect
Ground mode；
The fault simulation module（4）Output end and distribution network system（2）Input terminal be connected, fault simulation module（4）For
By the way that fault type is arranged, position, moment, duration occurs, to simulate distribution network system（2）The various failures that may occur
Situation；
The database（5）Input terminal and distribution network system（2）Output end be connected, the database（5）Output end and industry control
Machine communication interface（6）Input terminal be connected, database（5）In store distribution network system（2）In different earthing modes and not
With characteristic parameter and the simulation waveform under malfunction as a result, as signal source.
2. the test system of the practical route selection effect of a kind of low current neutral grounding system fault route selecting device according to claim 1,
It is characterized in that：The industrial computer communication interface（6）Output end and slave computer（8）Line selection apparatus to be measured preset communication interface phase
Even, the industrial computer communication interface（6）Pass through IPX/SPX agreements or TCP/IP with the default communication interface of line selection apparatus to be measured
Agreement establishes communication connection；
The test system of the practical route selection effect of a kind of low current neutral grounding system fault route selecting device according to claim 1,
It is characterized in that：The three phase mains（1）, distribution network system（2）, earthing mode selecting module（3）, fault simulation module（4）, number
According to library（5）, industrial computer communication interface（6）It is placed in an industrial personal computer, passes through industrial computer communication interface（6）With slave computer（8）
Line selection apparatus to be measured preset communication interface be connected.
3. the test system of the practical route selection effect of a kind of low current neutral grounding system fault route selecting device according to claim 1,
It is characterized in that：The distribution network system（2）Using the distribution network system of 10kV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720891432 | 2017-07-21 | ||
| CN2017208914325 | 2017-07-21 |
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| CN108535677A true CN108535677A (en) | 2018-09-14 |
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Citations (5)
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| CN203324463U (en) * | 2013-06-27 | 2013-12-04 | 国家电网公司 | Performance test and evaluation platform for small-current grounding line selection device |
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| CN203324463U (en) * | 2013-06-27 | 2013-12-04 | 国家电网公司 | Performance test and evaluation platform for small-current grounding line selection device |
| CN203324404U (en) * | 2013-06-27 | 2013-12-04 | 国家电网公司 | Test circuit for small current grounding line selection device |
| CA2855406A1 (en) * | 2013-07-02 | 2015-01-02 | Guildline Instruments Limited | Methods and systems for accuracy improvement in current comparators |
| CN104267365A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Portable small current earth-fault line selection closed loop performance tester |
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Application publication date: 20180914 |