CN108535559A - The method and apparatus of load test protection - Google Patents
The method and apparatus of load test protection Download PDFInfo
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- CN108535559A CN108535559A CN201810209511.2A CN201810209511A CN108535559A CN 108535559 A CN108535559 A CN 108535559A CN 201810209511 A CN201810209511 A CN 201810209511A CN 108535559 A CN108535559 A CN 108535559A
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- capacitor group
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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
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of load test guard method and devices.Wherein, this method includes：Obtain the multiple unit capacitor group to be accessed to station service electrical system, wherein the capacitors count for including per group capacitor group is identical or different；Anti- power transmission is carried out to station service electrical system, and according to the load of multiple unit capacitor group, multiple unit capacitor group is accessed into station service electrical system successively, until secondary side current meets preset condition；The protection of station service electrical system correlation is verified, check results are obtained.The present invention solves power plant in the prior art and falls the technical issues of can not carrying out load test protection during power transmission.
Description
Technical field
The present invention relates to electric fields, in particular to a kind of method and apparatus of load test protection.
Background technology
After booster stations, the installation of first and second equipment of station service electrical system, debugging are completed in capital construction phase power plant, in order to meet power plant
Unit commissioning of individual system and grid-connected operation, need to be by the anti-power transmission of power grid.It is pressed when anti-power transmission《Relay protection and the inspection of power grid security automatic device
Test regulations》It is required that have the device of strict demand to the mutual phase, the polarity that access Current Voltage with primary voltage, electric current judgement,
Ensure that relay protection can access after power transmission, booster stations telemetering, remote signalling measuring point are correctly sent to control centre.Load test,
According to (State Grid Corporation of China《AC sampling and measuring device verifies job instruction》) require, device acquires electric current less than nominal electricity
Stream 10% when, should not be verified.So when carrying out relay protection onload examination, there is sufficiently large primary current
It can carry out.
It during power transmission is fallen by power plant, is influenced by line length, transformer impedance, device drift (0-10mA), primary electricity
Flow it is small, protective relaying device sampling less than 20mA when, can not be verified；Or influenced by system operation mode also can not be into
Row verification.
It falls for power plant in the prior art the problem of can not carrying out load test protection during power transmission, not yet proposes at present
Effective solution scheme.
Invention content
An embodiment of the present invention provides a kind of method and apparatus of load test protection, at least to solve in the prior art
Power plant falls the technical issues of can not carrying out load test protection during power transmission.
One side according to the ... of the embodiment of the present invention provides a kind of load test guard method, including：It obtains waiting
Enter to the multiple unit capacitor group of station service electrical system, wherein the capacitors count for including per group capacitor group is identical or different；It is right
Station service electrical system carries out anti-power transmission, and according to the load of multiple unit capacitor group, multiple unit capacitor group is accessed to station service successively
System, until secondary side current meets preset condition；The protection of station service electrical system correlation is verified, check results are obtained.
Further, the multiple unit capacitor group to be accessed to station service electrical system is obtained, including：Obtain the one of station service electrical system
The no-load voltage ratio of secondary potential and current transformers；According to primary voltage, no-load voltage ratio and predetermined current obtain the total negative of multiple unit capacitor group
Lotus；According to the total load of multiple unit capacitor group, the load per group capacitor group is determined.
Further, according to the load of multiple unit capacitor group, multiple unit capacitor group is accessed into station service electrical system successively, directly
Meet preset condition to secondary side current, including：According to the load sequence from big to small of multiple unit capacitor, it is sequentially ingressed into multigroup
Capacitor group, until secondary side current reaches predetermined current, wherein use the triangular form mode of connection and station-service per group capacitor group
Electric system connects.
Further, it is verified to the protection of station service electrical system correlation, after obtaining check results, the above method also wraps
It includes：According to the load sequence from small to large of multiple unit capacitor, every group capacitor group of access is disconnected successively.
Further, after a group capacitor group is accessed to station service electrical system every time, the above method further includes：Detection
The electric current and busbar voltage of the capacitor group of access；According to the electric current and busbar voltage of the capacitor group of access, to station service system
The tap of the load ratio bridging switch of target transformer in system is adjusted.
Further, after obtaining the multiple unit capacitor group to be accessed to station service electrical system, the above method further includes：Root
According to the load of multiple unit capacitor group, modify to the protection definite value of station service electrical system；To station service electrical system correlation protect into
Row verification, after obtaining check results, the above method further includes：The protection definite value of station service electrical system is reverted into initial value.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of load test protective device, including：Obtain mould
Block, for obtaining the multiple unit capacitor group to be accessed to station service electrical system, wherein the capacitors count for including per group capacitor group
It is identical or different；AM access module, for carrying out anti-power transmission to station service electrical system, and according to the load of multiple unit capacitor group, according to
It is secondary that multiple unit capacitor group is accessed into station service electrical system, until secondary side current meets preset condition；Correction verification module, for factory
The protection of electricity system correlation is verified, and check results are obtained.
Another aspect according to the ... of the embodiment of the present invention, additionally provides a kind of storage medium, and storage medium includes the journey of storage
Sequence, wherein equipment where controlling storage medium when program is run executes above-mentioned load test guard method.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of processor, and processor is used to run program,
In, program executes above-mentioned load test guard method when running.
In embodiments of the present invention, after getting the multiple unit capacitor group to be accessed to station service electrical system, to station-service
Electric system carries out anti-power transmission, and according to the load of multiple unit capacitor group, multiple unit capacitor group is accessed to station service electrical system successively,
Until secondary side current meets preset condition, then the protection of station service electrical system correlation is verified, obtains check results, to
Realize that the purpose of load test protection is fallen to carry out during power transmission by power plant.Capacitor group is safer relative to perception, resistive load,
Installation, dismantling are more convenient, economical and smaller to electric network influencing, and it is active not consume system, compared with prior art, passes through electricity
Container group carries out load test, the needs of electric network terminal new power plant construction load test correlation protection is disclosure satisfy that, to reach
Arrived the shortening power plant construction period, on power system operating mode without influence, do not consumed that system is active, improve the power of network system because
The technique effect of element, and then solve power plant in the prior art and fall not carrying out during power transmission the technology of load test protection and ask
Topic.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of flow chart of load test guard method according to the ... of the embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of optional 220kV systems according to the ... of the embodiment of the present invention；
Fig. 3 is a kind of showing for the high-voltage capacitor group wiring of optional load test protection according to the ... of the embodiment of the present invention
It is intended to；And
Fig. 4 is a kind of schematic diagram of load test protective device according to the ... of the embodiment of the present invention.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
It includes to be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment to cover non-exclusive
Those of clearly list step or unit, but may include not listing clearly or for these processes, method, product
Or the other steps or unit that equipment is intrinsic.
Embodiment 1
According to embodiments of the present invention, a kind of embodiment of load test guard method is provided, it should be noted that
The step of flow of attached drawing illustrates can execute in the computer system of such as a group of computer-executable instructions, also,
It, in some cases, can be with different from shown in sequence execution herein although logical order is shown in flow charts
The step of going out or describing.
Fig. 1 is a kind of flow chart of load test guard method according to the ... of the embodiment of the present invention, as shown in Figure 1, the party
Method includes the following steps：
Step S102 obtains the multiple unit capacitor group to be accessed to station service electrical system, wherein includes per group capacitor group
Capacitors count is identical or different.
Specifically, as shown in Fig. 2, above-mentioned station service electrical system may include：220kV booster stations be double bus scheme (such as
Shown in the east 220kV mother and the west 220kV mother in Fig. 2), it is provided with 4 outlets (I occasion pool line, II occasion pool line, I occasion in such as Fig. 2
Ascend line and II occasion ascended shown in line, wherein I occasion ascend line and II occasion are ascended, and line is being built), 4 outlet common-tower double-returns are respectively connected to 2 not
Same substation, 2 generator transformer group inlet wires (as in Fig. 2 #1 main transformers and #2 main transformers shown in, wherein #2 main transformers are being built), 1
A high standby changing distance (as the #1 high in Fig. 2 is standby become shown in), separately have mother interval and the intervals PT (east mother PT in such as Fig. 2 with
Shown in western mother PT).As shown in figure 3, #1 high is female by common box bus (as shown in phantom in Figure 3) and 6kV station-services for low pressure side
Line connects.As shown in figure 3, above-mentioned multiple unit capacitor group is divided into two parts, being respectively connected to 61A sections and 61B sections, (two parts include
Capacitor group must be identical), the capacitors count that multiple unit capacitor group includes can be sequentially reduced, and there are two groups or two
Group or more the capacitor group capacitor group that includes it is identical.Wherein, the capacitors count that capacitor group includes is more, capacitor group
Load is bigger.In embodiments of the present invention, power plant 6kV station-services section has debugged completion, in conjunction with 6kV station-service section contact capacities, capacitance
The quantity of device group can be 12 sets.
It should be noted that configuring equipment and the guarantors such as discharge coil, current-limiting reactor, outer fuse per group capacitor group
Shield.
Step S104 carries out anti-power transmission to station service electrical system, and according to the load of multiple unit capacitor group, successively by multigroup electricity
Container group accesses to station service electrical system, until secondary side current meets preset condition.
Specifically, above-mentioned secondary side current can be that (current transformer is Current Transformer to mother CT
Abbreviation) secondary side current, above-mentioned preset condition can be that can to carry out load test bus differential protection corresponding secondary
The minimum current value of side electric current.
It should also be noted that, every outlet can carry out anti-power transmission to station service electrical system in station service electrical system, every time
Anti- power transmission is carried out to station service electrical system using an outlet, as shown in Fig. 2, station service electrical system includes 4 outlets, since I occasion are ascended
Line and II occasion line of ascending are being built, and load test twice can be carried out, and carry out anti-power transmission by I occasion pool line for the first time, and second logical
It crosses II occasion pool line and carries out anti-power transmission.
Step S106 verifies the protection of station service electrical system correlation, obtains check results.
It should be noted that it is existing to protect the method for calibration for carrying out load test may be used to station service electrical system correlation
Method of calibration, may include：The verification of booster stations bus differential protection, the verification of #1 high auxiliary differencial protections, circuit optical fiber differential protection
Verification etc., the embodiment of the present invention is not especially limited this.
In a kind of optional scheme, as shown in figure 3, before carrying out load test, it can be according to load test
It is required that the 12 group capacitor groups for needing to access station-service section are determined, specifically it needs to be determined that the capacitive reactive power per group capacitor group is negative
Lotus and connection type, and 12 group capacitor groups are respectively connected to 6kV station-service sections, 61A sections and 61B sections respectively with 6 group capacitor groups
It is attached.By I occasion pool line power transmission, each group electricity can be sequentially ingressed into according to the sequence of load from big to small
Container group, 61A sections identical with the capacitor group that 61B sections are accessed.Reach load test requirement in the secondary side current of mother CT
Later, the capacitor group not accessed no longer accesses, and is enabled according to scheduling and carry out Power Plant Side and offside is notified to carry out related protection phase
Position and poor flow measurement inspection, obtain check results.Wherein, it is same as above by the checking procedure of II occasion pool line power transmission.
According to the above embodiment of the present invention, after getting the multiple unit capacitor group of station service electrical system to be accessed, to factory
Electricity system carries out anti-power transmission, and according to the load of multiple unit capacitor group, is sequentially ingressed into multiple unit capacitor group, until secondary side electricity
Stream meets preset condition, is then verified to the protection of station service electrical system correlation, check results is obtained, to realize that power plant send
The purpose of load test protection is carried out during electricity.Capacitor group is safer relative to perception, resistive load, and installation, dismantling are more
Convenient, economical and smaller to electric network influencing, it is active not consume system, compared with prior art, passes through capacitor group and carries out band
Load check disclosure satisfy that the needs of electric network terminal new power plant construction load test correlation protection, to reach shortening power plant
Construction period does not consume that system is active on power system operating mode without influence, improves the technology effect of the power factor (PF) of network system
Fruit, and then solve power plant in the prior art and fall the technical issues of can not carrying out load test protection during power transmission.
Optionally, in the above embodiment of the present invention, step S102 obtains multigroup capacitance to be accessed to station service electrical system
Device group includes：
Step S1022 obtains the primary voltage of station service electrical system and the no-load voltage ratio of current transformer.
Specifically, above-mentioned primary voltage can be the voltage of power plant's booster stations output, and above-mentioned no-load voltage ratio can be mother
The primary side current of CT and the ratio of secondary side current, for example, in embodiments of the present invention, being carried out so that no-load voltage ratio is 4000/1 as an example
Illustrate, i.e., when primary current reaches 4000A, the electric current that secondary side senses is 1A.
Step S1024, according to primary voltage, no-load voltage ratio and predetermined current obtain the total load of multiple unit capacitor group.
Specifically, above-mentioned predetermined current can carry out the minimum electricity of the corresponding secondary side current of load test
Flow valuve is illustrated so that predetermined current is 20mA as an example in embodiments of the present invention.
In a kind of optional scheme, total load can be calculated according to following formula：
Wherein, U1For primary voltage, in embodiments of the present invention, by taking 230kV as an example；I1For the primary side current of mother CT；I2For mother
The secondary side current of CT, that is, I2For 20mA；K is the no-load voltage ratio of mother CT, that is, k is 4000.By calculating, what is obtained is total negative
Lotus is about 32MVA.
Step S1026 determines the load per group capacitor group according to the total load of multiple unit capacitor group.
In a kind of optional scheme, it can be determined and be needed 12 groups by calculating, the capacitor group of about 40Mvar connects altogether
Enter #1 high to commonly use in section for the 6kV of low pressure side, wherein 12 group capacitor groups can be divided into four kinds according to load, the first electricity
Container group is 2 groups, and the load per group capacitor group is 6012kVA, that is, including 18 6kV capacitors (single 6kV capacitance
The load of device is 334VA)；Second of capacitor group is 2 groups, and the load per group capacitor group is 4008kVA, that is, including
12 6kV capacitors；The third capacitor group is 4 groups, and the load per group capacitor group is 3006kVA, that is, including 9
6kV capacitors；Second of capacitor group is 2 groups, and the load per group capacitor group is 2004kVA, that is, including 6 6kV electricity
Container.
Optionally, in the above embodiment of the present invention, step S104 successively will be more according to the load of multiple unit capacitor group
Group capacitor group accesses to station service electrical system, until secondary side current meets preset condition and includes：
Step S1042 is sequentially ingressed into multiple unit capacitor group, directly according to the load sequence from big to small of multiple unit capacitor
Reach predetermined current to secondary side current, wherein connect with station service electrical system using the triangular form mode of connection per group capacitor group.
Specifically, since fabricated capacitors group (star-star connection) is 10kV grades, single rated capacitor voltage is respectively(capacitor in such as the first capacitor group and second of capacitor group) and
(capacitor in such as the third capacitor group and the 4th kind of capacitor group), the line voltage (U with power plant 6kV systems0=6.3kV)
It is close, therefore power plant's 6kV systems are connected to using triangular form wiring.
It should be noted that since the load of capacitor group is proportional to square of voltage, therefore corner connection is when 6.3kV systems,
The actual load of capacitor group is less than its rated load (it is assumed that 6kV busbar voltages are constant), and the load of the first capacitor group is
5917kvar, second of capacitor group load be 3945kvar, the load of the third capacitor group be 2484kvar, the 4th kind
The load of capacitor group is 1656kvar.In this case, (disregard 6kV busbar electricity when 12 group capacitor groups all access
Buckling), the total load Q actually accessed1About 36.3MVA>32MVA meets load test requirement.
It should also be noted that, after 12 group capacitor groups all access power plant's 6kV systems, busbar voltage caused by reality is lifted
It is upgraded to：△ U=(Q1/Soc)×U0=(36.3/550) × 6300 ≈ 415.6V, wherein Soc is 6kV busbar short-circuit loads, about
For 550MVA.In view of power plant 6kV system highests allow operating voltage to be 7.2kV, for capacitor group all after load, busbar is practical
Voltage is that Ue=6300+415.6=6715.6V ＜ 7.2kV, 6kV busbar highest operating voltages disclosure satisfy that demand.
Optionally, in the above embodiment of the present invention, in step S106, station service electrical system is verified, is verified
As a result after, this method further includes：
Step S108 disconnects every group capacitor of access successively according to the load sequence from small to large of multiple unit capacitor
Group.
In a kind of optional scheme, in circuit, female poor, standby bands for becoming other electric secondaries in protection and plant stand of #1 high
After load checks that work terminates, opening for each capacitor group can be disconnected successively by the reverse order (ascending) when accessing
It closes.
Optionally, in the above embodiment of the present invention, after a group capacitor group is accessed to station service electrical system every time,
This method further includes：
Step S110 detects the electric current and busbar voltage of the capacitor group of access.
Specifically, above-mentioned busbar voltage may include：6kV busbar voltages and 220kV busbar voltages.
Step S112, according to the electric current and busbar voltage of the capacitor group of access, to the target transformation in station service electrical system
The tap of the load ratio bridging switch of device is adjusted.
Specifically, above-mentioned target transformer can be the transformer being connect with 6kV busbares, in embodiments of the present invention,
Become as shown in figure 3, above-mentioned target transformer is that #1 high is standby.
In a kind of optional scheme, often access a group capacitor group, can to condenser current in capacitor group,
6kV busbares and 220kV busbar voltages are checked, and observe the voltage waveform of fault oscillograph.To ensure 6kV sections of voltages of station-service
Stablize, the tap of the standby load ratio bridging switches become of #1 high can be adjusted according to 6kV busbar voltage situations, can specifically be adjusted downwards
1 grade of #1 high is standby to become load ratio bridging switch.
Optionally, in the above embodiment of the present invention, in step S102, multigroup electricity to be accessed to station service electrical system is obtained
After container group, this method further includes：Step S114, it is fixed to the protection of station service electrical system according to the load of multiple unit capacitor group
Value is modified.
Can be according to capacitor group by the protection fixed value modification of 12 6kV switchgears in a kind of optional scheme
The protection definite value that load is adjusted.
Optionally, in the above embodiment of the present invention, in step S106, station service electrical system is verified, is verified
As a result after, this method further includes：The protection definite value of station service electrical system is reverted to initial value by S116.
Specifically, above-mentioned initial value can be the protection definite value of 6kV sections of switchgears of station-service.
In a kind of optional scheme, after load test terminates, can resume operation mode according to scheduling requirement,
And restore 6kV sections of switchgear protection definite values of station-service.
It should be noted that before accessing multiple unit capacitor group, insulation, electricity can be surveyed by carrying out 6kV power cables
Container field test etc. judges whether station service electrical system is charged normally, is determining the standby change of booster stations busbar, #1 high, the punching of 6kV busbares
It hits after electrification normally, load test can be carried out by I occasion pool line power transmission to scheduling application.
Above-described embodiment is verified below by experimental verification.Power plant implements anti-power transmission according to said program, presses
10 group capacitor groups have been put into successively according to descending sequence, amount to about 36.3Mvar.Period is to ensure that 6kV sections of voltages of station-service are steady
It is fixed, the standby change load ratio bridging switches of 1 grade of (1.25%) #1 high are had adjusted downwards.
During band maximum capacitor load, 6kV sections of busbar voltages of station-service are 6.58kV, power plant's booster stations 220kV busbar voltages
For 231kV, primary current is about 85.68A, and mother and circuit CT secondary currents are respectively 20mA, 33mA, can obviously be observed
Variation tendency.For each poor flow valuve of differential protection display close to zero (meeting the requirements), associated loop polarity is correct；Secondary winding
120 ° of three-phase phase mutual deviation, phase sequence is correct, as shown in table 1 to table 3.Table 1 shows circuit CT secondary currents, phase and difference stream
(2 face protection cabinets of 2 cabinets of protection and another circuit are omited), table 2 shows mother CT secondary currents, phase and difference stream (in 2 cabinets of protection
Hold and omit), table 3 shows that #1 high is standby and becomes CT secondary currents, phase and difference stream (2 cabinet contents of protection are omited).
Table 1
Table 2
Table 3
As shown in table 1 to table 3, above-mentioned items on-load is examined disposably to be smoothly completed on the day of anti-power transmission, and next day starts
Station-service 6kV load test runs work is carried out, 5 wheat harvesting period of total lever factor is saved, has ensured unit power generation on schedule.
Through the above scheme, related circuit is carried out using high-voltage capacitor group and female poor, #1 high auxiliary differencial protection bands is born
Lotus verifies, and meets the requirement of electric network terminal new power plant construction load test correlation protection.Compared with usual manner, has and shorten
The power plant construction period, on power system operating mode without influence, do not consume system it is active (improve instead the power of network system because
Number) the advantages that.It send station-service electrical tissue load to provide reference for similar power plant, there is certain promotion value.
Embodiment 2
According to embodiments of the present invention, a kind of embodiment of load test protective device is provided.
Fig. 4 is a kind of schematic diagram of load test protective device according to the ... of the embodiment of the present invention, as shown in figure 4, the dress
Set including：
Acquisition module 42, for obtaining the multiple unit capacitor group to be accessed to station service electrical system, wherein per group capacitor group
Including capacitors count it is identical or different.
Specifically, as shown in Fig. 2, above-mentioned station service electrical system may include：220kV booster stations be double bus scheme (such as
Shown in the east 220kV mother and the west 220kV mother in Fig. 2), it is provided with 4 outlets (I occasion pool line, II occasion pool line, I occasion in such as Fig. 2
Ascend line and II occasion ascended shown in line, wherein I occasion ascend line and II occasion are ascended, and line is being built), 4 outlet common-tower double-returns are respectively connected to 2 not
Same substation, 2 generator-transformer group inlet wires (as in Fig. 2 #1 main transformers and #2 main transformers shown in, wherein #2 main transformers are being built),
1 height for changing distance (as the #1 high in Fig. 2 is standby become shown in), separately have mother interval and the intervals PT (east mother PT in such as Fig. 2 with
Shown in western mother PT).As shown in figure 3, #1 high is female by common box bus (as shown in phantom in Figure 3) and 6kV station-services for low pressure side
Line connects.As shown in figure 3, above-mentioned multiple unit capacitor group is divided into two parts, being respectively connected to 61A sections and 61B sections, (two parts include
Capacitor group must be identical), the capacitors count that multiple unit capacitor group includes can be sequentially reduced, and there are two groups or two
Group or more the capacitor group capacitor group that includes it is identical.Wherein, the capacitors count that capacitor group includes is more, capacitor group
Load is bigger.In embodiments of the present invention, power plant 6kV station-services section has debugged completion, in conjunction with 66kV station-service section contact capacities, capacitance
The quantity of device group can be 12 sets.
It should be noted that configuring equipment and the guarantors such as discharge coil, current-limiting reactor, outer fuse per group capacitor group
Shield.
AM access module 44 successively will for carrying out anti-power transmission to station service electrical system, and according to the load of multiple unit capacitor group
Multiple unit capacitor group accesses to station service electrical system, until secondary side current meets preset condition.
Specifically, above-mentioned secondary side current can be the secondary side current of mother CT, and above-mentioned preset condition can be
It can carry out the minimum current value of the corresponding secondary side current of load test bus differential protection.
It should also be noted that, every outlet can carry out anti-power transmission to station service electrical system in station service electrical system, every time
Anti- power transmission is carried out to station service electrical system using an outlet, as shown in Fig. 2, station service electrical system includes 4 outlets, since I occasion are ascended
Line and II occasion line of ascending are being built, and load test twice can be carried out, and carry out anti-power transmission by I occasion pool line for the first time, and second logical
It crosses II occasion pool line and carries out anti-power transmission.
Correction verification module 46 obtains check results for being verified to the protection of station service electrical system correlation.
It should be noted that it is existing to protect the method for calibration for carrying out load test may be used to station service electrical system correlation
Method of calibration, may include：The verification of booster stations bus differential protection, the verification of #1 high auxiliary differencial protections, circuit optical fiber differential protection
Verification etc., the embodiment of the present invention is not especially limited this.
In a kind of optional scheme, as shown in figure 3, before carrying out load test, it can be according to load test
It is required that the 12 group capacitor groups for needing to access station-service section are determined, specifically it needs to be determined that the capacitive reactive power per group capacitor group is negative
Lotus and connection type, and 12 group capacitor groups are respectively connected to 6kV station-service sections, 61A sections and 61B sections respectively with 6 group capacitor groups
It is attached.By I occasion pool line power transmission, each group electricity can be sequentially ingressed into according to the sequence of load from big to small
Container group, 61A sections identical with the capacitor group that 61B sections are accessed.Reach load test requirement in the secondary side current of mother CT
Later, the capacitor group not accessed no longer accesses, and is enabled according to scheduling and carry out Power Plant Side and the progress of announcement trunk offside substation
Correlation protection phase and poor flow measurement inspection, obtain check results.Wherein, it is same as above by the checking procedure of II occasion pool line power transmission.
According to the above embodiment of the present invention, after getting the multiple unit capacitor group of station service electrical system to be accessed, to factory
Electricity system carries out anti-power transmission, and according to the load of multiple unit capacitor group, is sequentially ingressed into multiple unit capacitor group, until secondary side electricity
Stream meets preset condition, is then verified to the protection of station service electrical system correlation, check results is obtained, to realize that power plant send
The purpose of load test protection is carried out during electricity.Capacitor group is safer relative to perception, resistive load, and installation, dismantling are more
Convenient, economical and smaller to electric network influencing, it is active not consume system, compared with prior art, passes through capacitor group and carries out band
Load check disclosure satisfy that the needs of electric network terminal new power plant construction load test correlation protection, to reach shortening power plant
Construction period does not consume that system is active on power system operating mode without influence, improves the technology effect of the power factor (PF) of network system
Fruit, and then solve power plant in the prior art and fall the technical issues of can not carrying out load test protection during power transmission.
Embodiment 3
According to embodiments of the present invention, a kind of embodiment of storage medium is provided, storage medium includes the program of storage,
In, equipment where controlling storage medium when program is run executes the load test guard method in above-described embodiment 1.
Embodiment 4
According to embodiments of the present invention, a kind of embodiment of processor is provided, processor is for running program, wherein journey
The load test guard method in above-described embodiment 1 is executed when sort run.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
In the above embodiment of the present invention, all emphasizes particularly on different fields to the description of each embodiment, do not have in some embodiment
The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, for example, the unit division, Ke Yiwei
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
On unit.Some or all of unit therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes：USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of load test guard method, which is characterized in that including：
Obtain the multiple unit capacitor group to be accessed to station service electrical system, wherein the capacitors count phase for including per group capacitor group
It is same or different；
Anti- power transmission is carried out to the station service electrical system, and according to the load of the multiple unit capacitor group, successively by multigroup electricity
Container group accesses to the station service electrical system, until secondary side current meets preset condition；
Station service electrical system correlation protection is verified, check results are obtained.
2. according to the method described in claim 1, it is characterized in that, obtaining the multiple unit capacitor to be accessed to station service electrical system
Group, including：
Obtain the primary voltage of the station service electrical system and the no-load voltage ratio of current transformer；
According to the primary voltage, the no-load voltage ratio and predetermined current obtain the total load of the multiple unit capacitor group；
According to the total load of the multiple unit capacitor group, the load per group capacitor group is determined.
3. according to the method described in claim 1, it is characterized in that, according to the multiple unit capacitor group load, successively by institute
It states multiple unit capacitor group and accesses to the station service electrical system, until secondary side current meets preset condition, including：
According to the load sequence from big to small of the multiple unit capacitor, it is sequentially ingressed into the multiple unit capacitor group, until described
Secondary side current reaches predetermined current, wherein described to use the triangular form mode of connection and the station service system per group capacitor group
System connection.
4. according to the method described in claim 3, it is characterized in that, to the station service electrical system correlation protection verify,
After obtaining check results, the method further includes：
According to the load sequence from small to large of the multiple unit capacitor, every group capacitor group of access is disconnected successively.
5. according to the method described in claim 3, it is characterized in that, a group capacitor group is accessed to the station service every time
After system, the method further includes：
Detect the electric current and busbar voltage of the capacitor group of access；
According to the electric current of the capacitor group of the access and the busbar voltage, to the target transformer in the station service electrical system
The tap of load ratio bridging switch be adjusted.
6. according to the method described in claim 1, it is characterized in that,
After obtaining the multiple unit capacitor group to be accessed to station service electrical system, the method further includes：According to multigroup electricity
The load of container group modifies to the protection definite value of the station service electrical system；
It is verified to station service electrical system correlation protection, after obtaining check results, the method further includes：It will be described
The protection definite value of station service electrical system reverts to initial value.
7. a kind of load test protective device, which is characterized in that including：
Acquisition module, for obtaining the multiple unit capacitor group to be accessed to station service electrical system, wherein include per group capacitor group
Capacitors count is identical or different；
AM access module, for carrying out anti-power transmission to the station service electrical system, and according to the load of the multiple unit capacitor group, successively
The multiple unit capacitor group is accessed into the station service electrical system, until secondary side current meets preset condition；
Correction verification module obtains check results for being verified to station service electrical system correlation protection.
8. a kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein run in described program
When control the storage medium where equipment perform claim require load test guard method described in any one of 1 to 6.
9. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Profit requires the load test guard method described in any one of 1 to 6.
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| CN201810209511.2A CN108535559A (en) | 2018-03-14 | 2018-03-14 | The method and apparatus of load test protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810209511.2A CN108535559A (en) | 2018-03-14 | 2018-03-14 | The method and apparatus of load test protection |
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| CN110596512A (en) * | 2019-09-04 | 2019-12-20 | 广州粤能电力科技开发有限公司 | Large-scale transformer differential protection polarity verification method and device and computer equipment |
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