CN110297161A - Take precautions against the method and scheduling system of with ground power transmission of grid equipment - Google Patents
Take precautions against the method and scheduling system of with ground power transmission of grid equipment Download PDFInfo
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- CN110297161A CN110297161A CN201910545141.4A CN201910545141A CN110297161A CN 110297161 A CN110297161 A CN 110297161A CN 201910545141 A CN201910545141 A CN 201910545141A CN 110297161 A CN110297161 A CN 110297161A
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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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- 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
- G01R31/088—Aspects of digital computing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a kind of method for taking precautions against with ground power transmission of grid equipment and scheduling systems, belong to electric system service technique field, and method includes that grid equipment is provided with the fixed measurement point in position；Obtain the first induced voltage data of its measurement point when grid equipment is in the first electrical connection state of no ground point；When grid equipment is in the second electrical connection state before executing a power transmission step, the second induced voltage data of the measurement point are detected；If the second induced voltage data are identical as the first induced voltage data, power transmission step is executed；Second electrical connection state is corresponding with the first electrical connection state.The present invention is does not provide a kind of simple and effective equipment ground judgment technology means in the dispatcher of Overhaul site, on the one hand it solves the problems, such as that dispatcher only leans on Overhaul site to report and grasps ground wire information, has on the other hand filled up inside provision for sealing, the technological gap for the earthing discriminations such as outer part of path of standing.
Description
Technical field
The invention belongs to electric system service technique field, in particular to a kind of detection power failure grid equipment is before power transmission
It is no there are the method for grounding point and scheduling system.
Background technique
Grid equipment includes route, bus, main transformer etc. in transmission and distribution network.According to the electrical connection state of grid equipment,
Grid equipment can be divided into power failure and electriferous state, wherein power failure includes hot stand-by duty and cold standby state,
Electriferous state includes operating status, changes the electrical connection of the grid equipment of power failure to be changed into electriferous state, i.e.,
The power transmission of grid equipment.Power transmission includes at least both of which: a, successively switching electricity according to the sequence of cold standby, stand-by heat, operation
Net equipment electrical connection state；B, successively switch the electrical connection state of grid equipment according to the sequence of stand-by heat, operation.It is existing
In technology, there are two ways to prevention is in the with ground power transmission risk of grid equipment of power failure: 1, electrical by setting
The technological means such as locking and mechanical latching do not allow the mode of conjunction disconnecting link, switch real in the case of route has grounding point at the construction field (site)
Existing risk prevention system；2, means are organized by working site and reinforces on-site personnel work management, discipline management, scene is opened
Regulation regulation is guarded in exhibition work rigidly, just allows power transmission after the withdrawal of all ground wires.
The method of existing with ground power transmission risk of prevention device has the following problems: first is that only anti-in operation field deployment
Model, the control room or command post of distal end are in addition to call site is reported, without any technological prevention means；Second is that can not differentiate closing
Grid equipment inside or the station that is connect with grid equipment outside part of path whether be grounded；Third is that can not sentence after line fault breaking
Whether remove in disconnecting place.
Summary of the invention
Present invention aims at for maintenance scheduling system a kind of simple and effective grid equipment grounding point judgment method is provided,
On the one hand it solves the problems, such as that dispatching terminal can only grasp grid equipment ground wire information by on-the-spot report, on the other hand provides closed
Inside grid equipment, the technical method for the earthing discriminations such as outer part of path of standing to be to make up field data in the prior art missing.
Technical solution provided by the invention is a kind of method for taking precautions against with ground power transmission of grid equipment first, comprising: institute
It states grid equipment and is provided with the fixed measurement point in position；Obtain the first electrical connection shape that the grid equipment is in no ground point
First induced voltage data of its measurement point when state；Second before executing a power transmission step is in the grid equipment
When electrical connection state, the second induced voltage data of the measurement point are detected；If the second induced voltage data with it is described
First induced voltage data are identical, then execute the power transmission step；Second electrical connection state and the first electrical connection shape
State is corresponding.
Preferably, the first induced voltage of each of described measurement point data are provided with a change threshold, if the survey
Amount point the second induced voltage data difference compared with the corresponding first induced voltage data is less than the change threshold,
Then determine that the second induced voltage data are identical as the corresponding first induced voltage data.
Preferably, the first electrical connection state of the grid equipment and the second electrical connection state correspond to identical sky
Between electromagnetic field measurable parameter；The external electromagnetic field measurable parameter includes the work of temperature, humidity and/or surrounding grid equipment
Make state.
Preferably, the first electrical connection state of the grid equipment corresponds to identical stop with the second electrical connection state
Electricity condition；Alternatively, the first induced voltage data and the second induced voltage data include amplitude and/or the phase angle of voltage；
Alternatively, the grid equipment is equipped with more than two measurement points, so as to judge the grid equipment grounding point and measurement point
Between relative position；Alternatively, the grid equipment has the first electrical connection state of multiple no ground points, to judge not
It whether there is grounding point with corresponding different second electrical connection states of the first electrical connection state.
The present invention also provides a kind of scheduling systems for realizing above method embodiment, for implementing electric power tune to grid equipment
Degree control, comprising: measurement module, the induced voltage data of the measurement point for measuring the fixed position of the grid equipment；Institute
Stating induced voltage data includes, and the grid equipment is in the first induced voltage when the first electrical connection state of no ground point
Data, and/or, the second induction when the grid equipment is in the second electrical connection state before executing a power transmission step
Voltage data；Processing module, for reading the first induced voltage data and the second induced voltage data, if described
Second induced voltage data are identical as the first induced voltage data, then send the power transmission enable signal of the power transmission step；
Memory module, for storing the corresponding relation data of the second electrical connection state and the first electrical connection state described in measurement point,
So that processing module searches matched first electrical connection state according to the second electrical connection state.
Preferably, the processing module reads a variation threshold of each of described measurement point the first induced voltage data
Value, if the difference compared with the corresponding first induced voltage data of the second induced voltage data described in the measurement point is less than institute
Change threshold is stated, then determines that the second induced voltage data are identical as the corresponding first induced voltage data.
Preferably, corresponding relation data includes the first electrical connection state and the second electrical connection shape of the grid equipment
State corresponds to identical external electromagnetic field measurable parameter；The external electromagnetic field measurable parameter include temperature, humidity and/or
The working condition of surrounding grid equipment.
Preferably, corresponding relation data includes the historical data of the grid equipment and/or around the grid equipment
The historical data of other grid equipments, first electrical connection state or one second for marking the grid equipment are electrical
One classification of connection status, the processing module search the first electrical connection of same classification by the second electrical connection state
State.
Preferably, including power transmission module, for executing the power transmission step after receiving the power transmission enable signal.
Preferably, the first electrical connection state of the grid equipment corresponds to identical stop with the second electrical connection state
Electricity condition；Alternatively, the first induced voltage data and the second induced voltage data include amplitude and/or the phase angle of voltage；
Alternatively, the grid equipment is equipped with more than two measurement points, so as to judge the grid equipment grounding point and measurement point
Between relative position；Alternatively, the grid equipment has the first electrical connection state of multiple no ground points, to judge not
It whether there is grounding point with corresponding different second electrical connection states of the first electrical connection state.
One aspect of the present invention has the benefit that not provide a kind of letter in the dispatcher of Overhaul site
On the one hand single effective equipment ground judgment technology means solve dispatcher and Overhaul site are only leaned on to report grasp ground wire information
On the other hand problem has been filled up inside provision for sealing, the technological gap for the earthing discriminations such as outer part of path of standing.When grid equipment is in
First electrical connection state known to ground connection situation, such as stand-by heat, the cold standby of grounding point are excluded, measurement grid equipment is at this time
Induced voltage data, i.e. the first induced voltage data, and saving.It is all the electricity such as stand-by heat, cold standby when grid equipment is in
Gas connection status, but when needing to judge whether there is grounding point, i.e. when the second electrical connection state, processing module is from database
Inquire the induced voltage data of the grid equipment, i.e. the second induced voltage data.If comparison be the first induced voltage data with
Second induced voltage data are compared, such as same or similar, then it is assumed that no ground；As the second induced voltage data are much smaller than first
Induced voltage data, then it is assumed that grid equipment has grounding point at this time.
One aspect of the present invention has the benefit that accurate judgement grounding point still remains after line fault,
Trial line charging is avoided to the secondary pulse of power grid and grid equipment, by the induced electricity buckling for analyzing the multiple measurement points of grid equipment
Change, accurately position of failure point is positioned, the rapid Optimum for Rush Repair Scheme is formulated and the on-demand preparation of spare part provides foundation；It send
The secondary side equipment ground defect of the abnormal grid equipment connection of discovery in time of induced voltage before electric by detection grid equipment, keeps away
Exempt from equipment and repeat power grid mode caused by having a power failure to destroy and electric quantity loss.
One aspect of the present invention has the benefit that based on existing grid monitoring system, does not increase detection device
And testing staff, equipment fault and maintenance power transmission efficiency are effectively increased, equipment damage, electricity caused by band ground wire power transmission are avoided
Net stability disruption and the large-area power-cuts thus caused improve equipment safety operation level and power supply reliability.
Detailed description of the invention
Technical solution, which is provided, to the present invention with reference to the accompanying drawings and examples makes further explanation, other implementations of the present invention
Example can be shown from following each attached drawing easily to be obtained.
Fig. 1 is the system block diagram that system is dispatched in the embodiment of the present invention one；
Fig. 2 is the system block diagram that system is dispatched in the embodiment of the present invention two；
Fig. 3 is the measurement point position view of grid equipment in the specific embodiment of the invention one；
Fig. 4 is the measurement point position view of grid equipment in the specific embodiment of the invention two；
Fig. 5 is the measurement point position view of grid equipment in the specific embodiment of the invention three；
Fig. 6 is the measurement point position view of grid equipment in the specific embodiment of the invention four.
Specific embodiment
First it should be noted that ideally, the grid equipment of power failure will not charge, induced voltage of the present invention
The distribution parameter electricity formed for the grid equipment of power failure due to the alternating electromagnetic field and the grid equipment itself of spatial distribution
The induced electromotive force of road effect and generation, mainly includes following aspect according to production principle.
A, the capacitance voltage that electrostatic coupling effect generates: the grid equipment set up in parallel for parallel erected on same tower or near region,
Such as route, bus, since there are there is also electricity between capacitor, power failure equipments and the earth between charging equipment and power failure equipments
Hold, two capacitors can generate one voltage, the i.e. electricity to be generated by electrostatic coupling effect there are partial pressure effect in power failure equipments
Hold voltage.
B, the mutual voltage that electromagnetic induction generates: the biggish power failure equipments of bulk, such as route, if charged with periphery
Equipment is closer, when power failure equipments have at least one grounding point, by its earth-free end far from grounding point of theory deduction
In the presence of by periphery charging equipment, such as adjacent lines, the electromagnetic induction voltage that generates of alternating current, i.e., by electromagnetic induction between route
The mutual voltage of generation.
C, in the case of stand-by heat, power failure equipments impedance and switch fracture shunt capacitance between partial pressure: due to most of height
It compresses switch configured with fracture shunt capacitance, is affected by this, in power failure equipments hot stand-by duty, switch fracture shunt capacitance and stop
There are alternating current paths between electric equipment, to generate corresponding partial pressure in power failure equipments.It is disconnected switch is not configured for small part
The switch of mouth shunt capacitance, in equipment stand-by heat, voltage is only the induced voltage that periphery electromagnetic action generates, and numerical value is relatively
It is small.
Power transmission alleged by the present invention, comprising: be switched to fortune from cold standby state by hot stand-by duty after electric power apparatus examination
The normal power transmission of row state；And the trial line charging of operating status is switched to after electric equipment protection tripping from hot stand-by duty.This
It invents alleged first electrical connection state or the second electrical connection state is a kind of power failure.In the power system, power grid
Separated between equipment by multiple switch unit, connects the disconnecting link in each switch unit of grid equipment and be in quartile, simultaneously
When switch is in quartile, which is cold standby state；Disconnecting link in each switch unit of grid equipment is connected to locate
In coincidence, only switch is in quartile, which is in the hot stand-by duty that can be put into operation at any time.Electricity of the present invention
Net equipment not only includes the specific equipment such as single route, bus or main transformer, also includes setting for multiple single equipments connection composition
Standby set.
Core of the invention is the induced voltage data of the grid equipment by acquiring no ground point in advance, i.e., the first sense
Voltage data is answered, the reference data model of grid equipment is established, when needing to judge grid equipment with the presence or absence of grounding point, acquisition
The induced voltage data of grid equipment under current state, i.e. the second induced voltage data, establish the correlation data mould of grid equipment
Type, if correlation data model is different from reference data model, while being not present any known facts for causing this different again, then
It may determine that there are unknown grounding points for grid equipment at this time.Based on the thinking, those skilled in the art can pass through into one
The conventional daily data accumulation of power grid and artificial intelligence optimization's reference data model and Comparing method provides skill to improve the present invention
The accuracy of art scheme, while above-mentioned optimization is deemed to fall protection scope of the presently claimed invention.
Based on the description of above-mentioned core, further completely clearly illustrate the present invention below by embodiment and specific embodiment
The technical solution of offer, meanwhile, the technical program bring indirect benefits can also be further apparent from description
Obtain.
Embodiment one
The present embodiment is that a kind of method for taking precautions against with ground power transmission of grid equipment is adjusted applied to scheduling system as shown in Figure 1
Degree system includes: (1) measurement module, the voltage signal test side 41,42 being fixedly connected with grid equipment 10 in figure；And
The switch state test side 31,32 being connect with the switch unit 21,22 of grid equipment 10；(2) processing module, i.e. output is sent in figure
The processor of execution operation task in the remote server 50 of electric enable signal 60；(3) memory module, i.e. remote service in figure
Memory, disk or the storage drive of storing data in 50 remote server 50 of device.Remote server 50 and voltage
Signal detection end 41,42 and switch signal detection end 31,32 communication connections.Grid equipment 10 only by switch unit 21,22 with
The electrical connection of other grid equipments.Remote server 50 can be located at control centre or in the monitoring near Overhaul site
The heart.
Based on above system structure, a part of the invention can be realized by the following method in the scheduling system of the present embodiment
Technical effect.
S101: grid equipment 10 is in first the first electrical connection state, that is, grid equipment 10, which has been identified, to be not present
The switch unit 21,22 of grounding point, grid equipment 10 is in the first disjunction state, at this point, first of remote server 50 is transported
Row task completes following steps: obtaining the first disjunction shape of switch unit 21,22 respectively by switch state test side 31,32
State；First group of first induced voltage data of measurement point where being obtained respectively by voltage signal test side 41,42 respectively；It receives
After the confirmation message for confirming the current no ground point of grid equipment 10, first group of first induced voltage data are stored.
S102: grid equipment 10 is in second the first electrical connection state, that is, grid equipment 10, which has been identified, to be not present
The switch unit 21,22 of grounding point, grid equipment 10 is in the second disjunction state, at this point, second of remote server 50 is transported
Row task completes following steps: obtaining the second disjunction shape of switch unit 21,22 respectively by switch state test side 31,32
State；Second group of first induced voltage data of measurement point where being obtained respectively by voltage signal test side 41,42 respectively；It receives
After the confirmation message for confirming the current no ground point of grid equipment 10, second group of first induced voltage data are stored.
S103: grid equipment 10 is in first the second electrical connection state, that is, grid equipment 10, which is in, executes first
Before power transmission step, when needing to exclude grounding point, the switch unit 21,22 of grid equipment 10 is in the first disjunction state, at this point, far
The third operation task of journey server 50 completes following steps: it is single to obtain switch respectively by switch state test side 31,32
The third disjunction state of member 21,22；First group of measurement point where being obtained respectively by voltage signal test side 41,42 respectively the
Two induced voltage data；According to the first disjunction state, first group of first induced voltage data of grid equipment 10 are read, if
First group of second induced voltage data are identical as first group of first induced voltage data, then export power transmission enable signal 60,
First power transmission step is executed after receiving the signal so as to other tasks or other systems of this system.
S104: grid equipment 10 is in second the second electrical connection state, that is, grid equipment 10, which is in, executes second
Before power transmission step, when needing to exclude grounding point, the switch unit 21,22 of grid equipment 10 is in the second disjunction state, at this point, far
4th operation task of journey server 50 completes following steps: it is single to obtain switch respectively by switch state test side 31,32
Second disjunction state of member 21,22；Second group of measurement point where being obtained respectively by voltage signal test side 41,42 respectively the
Two induced voltage data；According to the second disjunction state, second group of first induced voltage data of grid equipment 10 are read, if
Second group of second induced voltage data are identical as second group of first induced voltage data, then export power transmission enable signal 60,
Second power transmission step is executed after receiving the signal so as to other tasks or other systems of this system.
In above-mentioned S101, S102, S103 and S104, the first disjunction state is used to identify with the second disjunction state, because electric
The different position of the switch or disconnecting link position of 10 switch unit 21,22 of net equipment so that grid equipment 10 have it is different and its
The connecting structure for electrical equipment of his grid equipment, to be in different electrical connection states.Wherein, the first electrical connection state refers to electricity
Grounding point is clearly not present in net equipment 10, and what the second electrical connection state referred to grid equipment 10 is uncertain with the presence or absence of grounding point
, when each component electrically connects with one second in the switch unit 21,22 of the grid equipment 10 of first electrical connection state
Connect each component in the switch unit 21,22 of the grid equipment 10 of state position it is identical when, the two electrical connection having the same
Structure is transferred identical with its connecting structure for electrical equipment first and is electrically connected after obtaining second electrical connection state so as to system
The corresponding first induced voltage data of state are connect, and for the ratio with the second induced voltage data of second electrical connection state
It is right.Due to when one or more the first induced voltage data by obtaining establish the first data model, and one by obtaining
A or multiple second induced voltage data establish the second data model, are sentenced with will pass through the comparison progress identity of data model
Disconnected, essence is still the comparison to the first induced voltage data and the second induced voltage data, therefore the program is it should be appreciated that be
Second induced voltage data of the present invention and the whether identical comparison behavior of the first induced voltage data.
Obviously, switch unit 21,22 can there are many disjunction states, grid equipment 10 therefore to have a variety of electrical connection shapes
State, the switch unit connected between grid equipment 10 and other grid equipments are also possible to disconnecting link, breaker, disconnecting switch etc. no
With the combination of disjunction equipment or different disjunction equipment.
The storage and reading of the present embodiment, can be the operation based on tables of data, be also possible to neural network based
Habit and operation.Specifically by taking data table handling as an example, system establishes tables of data T, field definition for grid equipment 10 are as follows: field
One, electrical connection state unique identification, field two, 21 disjunction state of switch unit, field three, 22 disjunction state of switch unit,
Voltage data at field four, measurement point 41, voltage data at field five, measurement point 42, each field can be number or number
The set of word.In S101, first operation task, in respective first point of switch unit 21,22 for obtaining grid equipment 10
Disconnected state: P11, P12, while after obtaining its first induced voltage data V11, V12 increase a record in tables of data: 1,
P11, P12, V11, V12；In S102, second operation task is respective in the switch unit 21,22 for obtaining grid equipment 10
Second disjunction state: P21, P22, while after obtaining its first induced voltage data V21, V22, increase a note in tables of data
Record: 2, P21, P22, V21, V22.Wherein, P11 is identical as P12, and P21 is identical as P22, and two logical comparison results are not simultaneously
Very.In S103, third operation task, in switch unit 21, the 22 respective disjunction states for obtaining grid equipment 10:
P31, P32, the P31 is identical as P11, and the P32 is identical as P12, meanwhile, obtain its second induced voltage data V31, V32
Afterwards, the record that switch unit 21,22 is respectively P11, P12 is searched in tables of data: after 1, P11, P12, V11, V12, Cong Zhongti
V11, V12 are taken, and whether compare V31 and V11 identical, whether identical, the two is all true, i.e. grid equipment 10 if comparing V32 and V12
First be in, second electrical connection state is no ground dotted state.In S104, the 4th operation task and third
A operation task process is identical, unlike, the lookup result in tables of data T is record: 2, P21, P22, V21, V22.
In neural network, the characteristic quantity that respective field value can be used as neural network participates in study, and those skilled in the art can be based on upper
Stating bright will be imposed in neural network.
Embodiment two
The present embodiment is a kind of method for taking precautions against with ground power transmission of grid equipment, is applied to a kind of scheduling system, the present embodiment
Scheduling system and dispatch the difference of system in embodiment one and be, except switch state test side 31,32 and voltage can be passed through
Outside signal detection end 41,42, can also by environmental sensors such as the temperature, the humidity that are arranged in around grid equipment 10, and
Around grid equipment 10 other grid equipments working condition sensor obtain influence 10 surrounding space electromagnetic field of grid equipment because
The parameter of element marks first electrical connection state of each of grid equipment 10 using these parameters and sorts out, such as powers on from history
In multiple power failure periods of net equipment 10, the environment temperature of the period, ambient humidity and ambient radiation function are extracted
The first electrical connection state with a connecting structure for electrical equipment is divided by voltage value, the current value of the biggish grid equipment of rate
Multiclass, in order to the detailed comparisons to the first electrical connection state and corresponding second electrical connection state.
As shown in Fig. 2, nearby there are adjacent grid equipment 1 and adjacent grid equipment 2, phases by the measurement point A of grid equipment 10
Adjacent grid equipment 1 and adjacent grid equipment 2 and grid equipment 10 only pass through external electromagnetic field shadow there is no direct electrical connection
Ring the induced electromotive force of grid equipment 10.The test of multiple measurement 10 induced voltage data of grid equipment is provided at measurement point A
Module measures the current sensor and temperature-humidity sensor of adjacent grid equipment 1 and adjacent grid equipment 2 respectively, measurement
The relevant data of measurement point A are transmitted to remote server 50 by module, current sensor and temperature-humidity sensor, and distal end takes
Business device 50 can send power transmission enable signal to power transmission module 70 according to request.
Specifically, the present embodiment can realize the technology of the present invention side according to step is provided in following steps in conjunction with the embodiments one
The function of one part of case:
S201, the tables of data T described in memory module constitution and implementation example one, and increase respective field: field six, ambient humidity etc.
Grade, field seven, environment temperature grade, field eight, 1 electric current of adjacent grid equipment, field nine, 2 electric current of adjacent grid equipment.
S202, when grid equipment 10 is in first electrical connection state, remote server 50 is obtained and is wrapped at measurement point A
Parameters containing the first induced voltage data, and create one in the tables of data T record comprising whole fields.
S203, when grid equipment 10 is in second electrical connection state, remote server 50 is obtained and is wrapped at measurement point A
Parameters containing the second induced voltage data, according to the parameter in parameter in addition to the second induced voltage data, in tables of data T
Matched record is retrieved, extracts the first induced voltage data in search result record, and compare the first induced voltage data
Power transmission enable signal is sent to power transmission module 70 according to comparison result with the second induced voltage data.If second sense
It answers voltage data to be less than the first induced voltage data, then stops the power transmission.
In the present embodiment, it is preferred that since there are errors for measuring device, when relatively whether induced voltage data are identical,
Corresponding change threshold can be set for the first induced voltage data of the measurement point, if the second induced voltage data
Less than the first induced voltage data and the two difference is greater than the change threshold, then stops the power transmission.Induced voltage
Data include more than two inductive voltage values corresponding with grid equipment connection status, and each inductive voltage value is set with the power grid
The state of standby upper paralleling switch is corresponding, including cold standby state or hot stand-by duty.Specifically, can increase in tables of data T
The threshold field of corresponding each first induced voltage data, and in S203 after extraction respective record, according to each in the record
Whether the corresponding threshold decision of the first induced voltage data is identical.
Grid equipment can be power network line, bus, main transformer etc. in the present invention, and the power network line includes common-tower double-return line
Road, near region parallel circuit and single back line.The measurement point can be arranged along power transmission direction, and upstream measurement such as can be set
Point and downstream measuring points.Power transmission enable signal, which can be in response to the execution before a step of the grid equipment transmission process, asks
It asks, is also possible to the active broadcast after the grid equipment for judging second electrical connection state is with the presence or absence of grounding point and sends.
Implemented below by the specific embodiment explanation in 500kV transmission of electricity, distribution network based on one providing method of embodiment
Technical solution of the present invention.
Specific embodiment one
As shown in figure 3, the grid equipment of this specific embodiment is one time in one section of multiple-circuit on same tower of 500kV power distribution network
Route road, i.e. stoppage in transit route are route AB between substation A and substation B, around exist with tower return lead CD,
Whether stoppage in transit route has grounding point to be affected the induced voltage at route both ends.When no ground, stoppage in transit route, induced electricity
Pressure is mainly the capacitance partial pressure of alive circuit on it, and amplitude is larger, and phase angle is close；When having grounding point, induced voltage is mainly
The mutual voltage of alive circuit on it, amplitude are smaller.
Under normal circumstances, after the side route AB substation A and bus disconnect, and substation's B side bus also disconnects, i.e. route
After AB stops transport, when route AB no ground, i.e. when route AB is in first electrical connection state, two sides measurement point PA
The three-phase induction voltage magnitude measured with measurement point PB is about in 3~26kV, the first induced electricity of the no ground point of the stoppage in transit route
Pressure data can be the data that the approach such as theory analysis, software emulation and actual measurement obtain in no ground situation.One
It is a need to judge whether route AB has grounding point in the state of, i.e. second electrical connection state, if the second of side feels
Answering voltage is almost 0kV, and the second induced voltage of the other side is down to 0.7~2kV, then may determine that the second induced voltage is that zero side goes out
Existing grounding point.
Illustrate the judgment step of processing module below by two specific data of the type grid equipment.
Ground fault judges one
Such as following table, table 1 has stored the first induced voltage when route AB is in first electrical connection state in tables of data T
Data, i.e. route AB are in the first induced voltage data when Standby Line state, and default change threshold is 90%.
Table 1
When service work is completed, after route AB cuts hot stand-by duty again from cold standby state, need to judge route AB at this time
With the presence or absence of grounding point, i.e. route obtains from measurement point PA and measurement point PB in second electrical connection state, processing module
Obtain the second induced voltage data as shown in table 2 below.
Table 2
Processing module from tables of data T retrieval be all " route AB hot stand-by duty " record in the first induced voltage data,
Compare voltage value 0.06kV, the 0.66kV that can obtain the A phase of the route AB in the second electrical connection state, it is corresponding much smaller than its
A phase voltage value 15.83kV, 15.6kV when the first electrical connection state, therefore judge the A phase of route AB there are grounding points, simultaneously
Since the voltage value 0.06kV of the side measurement point PA is smaller than the voltage value 0.66kV of the side measurement point PB, occurred ground connection is judged
It puts closer at measurement point PA.
Ground fault judges two
Such as the following table 3, the first induced voltage number when route AB is in first electrical connection state has been stored in tables of data T
According to i.e. route AB is in the first induced voltage data when Standby Line state, and default change threshold is 10%.
Table 3
When service work is completed, after route AB cuts hot stand-by duty again from cold standby state, need to judge route AB at this time
With the presence or absence of grounding point, i.e. route obtains from measurement point PA and measurement point PB in second electrical connection state, processing module
Obtain the second induced voltage data as shown in table 4 below:
Table 4
Processing module from tables of data T retrieval be all " route AB hot stand-by duty " record in the first induced voltage data,
Compare the voltage value 0.071kV that can obtain A phase at the measurement point PB of the route AB in the second electrical connection state, it is right much smaller than its
A phase voltage value 0.365kV at measurement point PB when the first electrical connection state answered, therefore judge that the A phase of route AB has ground connection
Point judges occurred grounding point closer to measurement point since other data are essentially identical in induced voltage data comparison
At PB.According further to simulation result, when there is grounding point in the centre of stoppage in transit route, the induced voltage of two sides is below unilateral ground connection
When induced voltage, and there are also another obvious characteristic, the voltage phase angle of Earth Phase two sides is substantially opposite, therefore judges grounding point
It appears between measurement point PA and measurement point PB.
The near region 500kV parallel circuit, when no ground, stoppage in transit route, the three-phase induction voltage magnitude of two sides about 5~
12 kilovolts；When there is grounding point in side, this side voltage is 0, and opposite side induced voltage is down to 0.5 kilovolt or so.
It, can also be with because its neighbouring electromagnetic field is approximate with common-tower double-return for there are the routes of near region parallel circuit
Use the present embodiment the method.
Specific embodiment two
As shown in figure 4, the grid equipment of this specific embodiment is one section of single time without other parallel circuits nearby in power transmission network
Route, i.e. route AB.
500kV single back line induced voltage is generally lower, mainly appears under hot stand-by duty.Under cold standby state,
Disconnecting link disconnects, and capacitance partial pressure circuit open circuit, line voltage distribution is down to essentially 0.
Although data are integrally less than normal, under line-to-ground and hot stand-by duty, induced voltage is changed significantly, variable quantity
Within the scope of PT precision (secondary side 0.06V, primary side 0.3kV) Observable, the criterion whether being grounded also can be used as.
Specific embodiment three
As shown in figure 5, the grid equipment of this specific embodiment is that one section of 500kV bus W, bus W in substation C only passes through line
The a plurality of routes such as road W1, route W2 ... route WN are connect with other grid equipments.The measurement point PC of bus W is located on bus W,
Its each phase induced voltage is about 6~73kV when bus W stand-by heat, and voltage sharply declines after cold standby.As bus W turns cold standby
Operation, switch tool successively pull open, and switched fracture capacitance in parallel gradually decreases, and bus W voltage ladder is reduced to induced voltage,
Ladder quantity cooperates the switch number of fracture capacitor suitable on bus W.When bus W power transmission, voltage change is opposite with when having a power failure.
It is provided below and implementation method of the present invention is illustrated based on this specific embodiment:
During bus W turns cold standby by stand-by heat, there are multiple first electrical connection states, can in accordance with the following methods successively
Obtain the corresponding first induced voltage data of each first electrical connection state: bus W and route W1 to the switch between WN
One group of first induced voltage data at measurement point PC are recorded when in hot stand-by duty, and are labeled as the first electrical connection state
0；It is subsequent, bus W and route W1 to the switching sequence between WN is turned into cold standby (pulling open switch two sides disconnecting link), every operation one by one
A complete switch, records one group of first induced voltage data, is respectively labeled as the first electrical connection state 1 to the first and electrically connects
Meet state N.By taking B phase as an example, the tables of data T such as the following table 5 structure is formed, threshold value is predefined as 10%.
Table 5
During bus W turns stand-by heat by cold standby, there are multiple second electrical connection states, can in accordance with the following methods successively
The corresponding second induced voltage data of each second electrical connection state are obtained, after judging grounding point, then are switched to next
Second electrical connection state, only by taking B phase as an example: on bus W it is all switch all in cold standby state when record one group of second sense
Voltage data 0.891kV is answered, the second electrical connection state N is labeled as, is found from tables of data T and the second electrical connection state N
Corresponding first electrical connection state N, corresponding relationship be bus equally not with any route there are stand-by heat connection relationship,
Its first induced voltage data 0.887kV is read, according to threshold decision, the two is identical, therefore sends next step power transmission enable signal,
The switch of route WN is cut into stand-by heat；It is subsequent, it is identical with previous step, by bus W and route W1 to the switch between WN
Backward turns stand-by heat (close a switch two sides disconnecting link) one by one, every to have operated a switch, obtains one group of second induced voltage number
According to after corresponding first induced voltage data comparison, then carrying out next step power transmission operation.Apparently according on bus W and route
W1 to the switch state between WN, the second electrical connection state 0 and the first electrical connection state 0, the second electrical connection state 1 with
First electrical connection state 1 ... the second electrical connection state N and the first electrical connection state N correspond respectively to identical electricity
Gas connects topological relation.
Table 6
Specific embodiment four
As shown in fig. 6, the grid equipment of this specific embodiment is a main transformer D in distribution network transformer substation, the high pressure of general main transformer
Side, medium voltage side and low-pressure side are equipped with PT, respectively as measurement point PH, measurement point PM and measurement point PL, the choosing of this specific embodiment
It is contrasting foundation with the measurement point PH between main transformer high-pressure side casing and high side switch casing.Main transformer D, which has a power failure, at this turns
Induced voltage is respectively mutually about 12.31kV after stand-by heat, and voltage drop is down to 0 after high side switch turns cold standby, voltage when power transmission
Variation is opposite with when having a power failure.As shown in table 7 below, according to data are obtained at measurement point PH, processing module is likely to be obtained such as flowering structure
Data, threshold value 20%.
Table 7
Obviously on electrical-connection topological structure, the second electrical connection state 1 is corresponding with the first electrical connection state 1, the second electricity
1 pair of gas connection status 2 and the second electrical connection state are with according to above-mentioned data, it is that main transformer D is in that processing module, which analyzes result,
No ground point when two electrical connection states 2 is in the no ground point of the second electrical connection state 1.
The embodiment of the present invention and specific embodiment are all made of successively progressive method description, for repetition and art technology
Personnel are not repeating according to the content that can clearly implement in preceding explanation in rear embodiment or specific embodiment.
Present method invention is embodied in undisclosed situation, has been successfully applied to 500kV equipment fault and inspection
It repairs power transmission 27 times, finds the problem at 2.First is that accurate judgement ground connection still remains after 500kV XX line failure, avoids examination and send pair
Power grid and equipment secondary pulse, while position of failure point is accurately positioned by analysis induced voltage variation, it is the fast of Rush Repair Scheme
Speed optimization is formulated and the on-demand preparation of spare part provides accurate foundation；Second is that passing through induced voltage exception before 500kVXX line power transmission
Unilateral route PT secondary defect is found in time, and the power grid mode caused by equipment repetition has a power failure that avoids is destroyed and electric quantity loss.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of method for taking precautions against with ground power transmission of grid equipment characterized by comprising the grid equipment is provided with position
Set fixed measurement point；Obtain its measurement point when the grid equipment is in the first electrical connection state of no ground point
First induced voltage data；When the grid equipment is in the second electrical connection state before executing a power transmission step, inspection
Survey the second induced voltage data of the measurement point；If the second induced voltage data and the first induced voltage data phase
Together, then the power transmission step is executed；Second electrical connection state is corresponding with the first electrical connection state.
2. the method for prevention with ground power transmission of grid equipment according to claim 1, it is characterised in that: the measurement point
Each of the first induced voltage data be provided with a change threshold, if the second induced voltage data described in the measurement point with
The corresponding first induced voltage data are less than the change threshold compared to difference, then determine the second induced voltage data
It is identical as the corresponding first induced voltage data.
3. the method for prevention with ground power transmission of grid equipment according to claim 1, it is characterised in that: the power grid is set
Standby the first electrical connection state and the second electrical connection state corresponds to identical external electromagnetic field measurable parameter；The sky
Between electromagnetic field measurable parameter include temperature, humidity and/or surrounding grid equipment working condition.
4. the method for prevention with ground power transmission of grid equipment according to any one of claims 1 to 3, it is characterised in that:
The first electrical connection state and the second electrical connection state of the grid equipment correspond to identical power failure；Alternatively, institute
It states the first induced voltage data and the second induced voltage data includes amplitude and/or the phase angle of voltage；Alternatively, the power grid is set
It is standby to be equipped with more than two measurement points, to judge the relative position between measurement point of the grid equipment grounding point；
Alternatively, the grid equipment has the first electrical connection state of multiple no ground points, to judge that difference first is electrically connected
Corresponding different second electrical connection states of state whether there is grounding point.
5. a kind of scheduling system, for implementing power scheduling control to grid equipment characterized by comprising
Measurement module, the induced voltage data of the measurement point for measuring the fixed position of the grid equipment；The induced electricity
Pressure data include that the grid equipment is in the first induced voltage data when the first electrical connection state of no ground point, and/
Or, the second induced voltage number when the grid equipment is in the second electrical connection state before executing a power transmission step
According to；
Processing module, for reading the first induced voltage data and the second induced voltage data, if described second
Induced voltage data are identical as the first induced voltage data, then send the power transmission enable signal of the power transmission step；
Memory module, for storing the corresponding relationship number of the second electrical connection state and the first electrical connection state described in measurement point
According to so that processing module searches matched first electrical connection state according to the second electrical connection state.
6. scheduling system according to claim 5, it is characterised in that: the processing module reads each of described measurement point
One change threshold of the first induced voltage data, if the second induced voltage data described in the measurement point and corresponding described
One induced voltage data compared to difference be less than the change threshold, then determine the second induced voltage data with it is corresponding described
First induced voltage data are identical.
7. scheduling system according to claim 5, it is characterised in that: corresponding relation data includes the of the grid equipment
One electrical connection state and the second electrical connection state correspond to identical external electromagnetic field measurable parameter；The spatial electromagnetic
Field measurable parameter includes the working condition of temperature, humidity and/or surrounding grid equipment.
8. scheduling system according to claim 5, which is characterized in that corresponding relation data includes the history of the grid equipment
The historical data of data and/or other grid equipments around the grid equipment, for marking one of the grid equipment
One classification of the first electrical connection state or second electrical connection state, the processing module pass through the second electrical connection
First electrical connection state of the same classification of lookup of state.
9. scheduling system according to claim 5, it is characterised in that: including power transmission module, for receiving the power transmission
After enable signal, the power transmission step is executed.
10. according to the described in any item scheduling systems of claim 5 to 9, it is characterised in that: the first of the grid equipment is electrical
Connection status and the second electrical connection state correspond to identical power failure；Alternatively, the first induced voltage data and
Two induced voltage data include amplitude and/or the phase angle of voltage；Alternatively, the grid equipment is equipped with more than two measurements
Point, to judge the relative position between measurement point of the grid equipment grounding point；Alternatively, the grid equipment is with more
First electrical connection state of a no ground point, to judge that different first electrical connection states corresponding different second electrically connect
State is connect with the presence or absence of grounding point.
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