CN108919061A - A kind of digitlization small current earthing wire-selecting method - Google Patents
A kind of digitlization small current earthing wire-selecting method Download PDFInfo
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- CN108919061A CN108919061A CN201811099348.5A CN201811099348A CN108919061A CN 108919061 A CN108919061 A CN 108919061A CN 201811099348 A CN201811099348 A CN 201811099348A CN 108919061 A CN108919061 A CN 108919061A
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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
Abstract
The present invention discloses a kind of digitlization small current earthing wire-selecting method, step 1：It acquires output device and completes each route three-phase current and zero-sequence current sampling；Step 2：It acquires output device and completes each route zero sequence CT polarity discriminating amendment zero-sequence current sampled data, and line selection apparatus is sent to using optical fiber is point-to-point by IEC60044-8 communications protocol；Step 3：The sampled data that line selection apparatus receives each route completes synchronization process；Step 4：Data line selection apparatus after synchronization process selects faulty line using transient arithmetic comprehensive analysis and judgement, and acquires output device tripping isolated fault by the route.
Description
Technical field
The present invention relates to a kind of earthing wire-selecting methods of electric system power transmission and distribution, the in particular to choosing of small current neutral grounding system
Line method.
Background technique
The system of China's power grid 3-66kV voltage class, neutral point generally use small current neutral grounding mode, including neutrality
Point it is earth-free, through grounding through arc, through high resistance ground, also known as neutral non-effective grounding mode.Small current neutral grounding system
The characteristics of be, occur singlephase earth fault when, can operate with failure 1-2 hours.Therefore system reliability of operation is improved,
But when due to singlephase earth fault, non-faulting phase voltage can be increased as line voltage, be operated with failure for a long time, system interior insulation is thin
Weak link is easily breakdown, causes phase fault or three-phase shortcircuit, fault coverage is caused to expand, and seriously affects Supply Security and can
By property.Therefore, when permanent singlephase earth fault occurs, it is necessary to locating bad lines and cut off as early as possible.
When singlephase earth fault occurs for small current neutral grounding system, have the characteristics that short circuit current is small, fault signature is unconspicuous,
It has passed through domestic and international years of researches, a variety of earthing wire-selecting methods, configure special small current neutral grounding in practical applications
Line selection apparatus realizes that current all kinds of usual big city of device are using phase comparing method as one of main selection method, i.e., by comparing
The phase of each route zero-sequence current finds difference and carries out failure line selection, but the premise of phase comparing method route selection is require each route zero
Sequence CT polarity must be consistent, and scene has that zero sequence CT polarity is difficult to verify, this results in the route selection based on phase comparing method
Device is all restricted；Furthermore the numerous traditional line-selected earthing devices of general substation outgoing line interval need to access a large amount of secondary electricity
Cable, construction volume it is very big and there are when secondary cable broken string or virtual connection can not Realtime Alerts the problems such as.Therefore, current to connect
Ground variant projects of location exists can improvements.
Summary of the invention
The purpose of the present invention is：For small current neutral grounding system, proposes a kind of digitlization small current earthing wire-selecting method, mention
High phase comparing method route selection accuracy rate reduces secondary cable laying quantity and investment, realizes channel real-time monitoring alarming to improve fortune
Row reliability.
In order to achieve the above objectives, solution of the invention is：
A kind of digitlization low current selection method, small current neutral grounding system configure each line configuring acquisition of line selection apparatus, system
Output device, each route acquisition output device of substation realize each spaced simulation amount acquisition respectively and carry out zero sequence to sampled data
The amendment of CT polarity, revised sampled data are sent to line selection apparatus by optical fiber, and line selection apparatus receives each interval sampling
Synchronization process is carried out after data, and differentiation is comprehensively compared using transient arithmetic and selects faulty line, specifically comprises the following steps：
Step 1：The acquisition output device of each route completes three-phase current, voltage and the zero-sequence current sampling at this interval；
Step 2：The acquisition output device of each route carries out zero sequence CT polarity discriminating, corrects sampled data automatically, and will be after amendment
Sampling data transmitting give line selection apparatus；
Step 3：Line selection apparatus completes bus residual voltage data sampling, receives the sampling that each route acquisition output device is sent
Data simultaneously synchronize processing to data；
Step 4：Line selection apparatus selects failure to the sampled data after synchronization process, using transient arithmetic comprehensive comparative analysis
Route, and GOOSE trip signal is sent to route acquisition output device, corresponding acquisition output device receives GOOSE tripping
It trips after signal isolated fault.
Wherein, sampling data transmitting gives line selection apparatus in the step 2, is to be sent using fiber optic point to point mode, sends
Shi Caiyong IEC60044-8 agreement.
Wherein, the acquisition output device in the step 2 carries out zero sequence CT polarity discriminating and corrects sampled data automatically, specifically
Method be ground fault occur when, acquisition output device automatically more self-produced zero-sequence current with external zero-sequence current relative to self-produced
The phase of residual voltage differentiates whether polarity accesses wrong, the zero sequence if polarity is wrong, when to ground fault to zero-sequence current
Current phase characteristic quantity is automatically corrected on the basis of phase of the self-produced zero-sequence current relative to self-produced residual voltage, can be with
Alarm signal is simultaneously emitted by,.
Wherein, the sampled data that line selection apparatus sends acquisition output device in step 3, using Lagrange interpolation method weight
Synchronization process is completed in sampling.
Wherein, the transient arithmetic in the step 4 includes：Transient state phase comparing method, transient state based on wavelet package transforms than width method,
Transient power direction method.
After adopting the above scheme, the beneficial effects of the invention are as follows：
（1）It is capable of the polarity amendment sampled data of automatic discrimination zero sequence CT, improves phase comparing method route selection accuracy rate；
（3）Secondary cable quantity is largely reduced, investment is reduced；
（3）Analog quantity and switching value pass through optical-fibre communications transmission, it can be achieved that real-time monitoring alarming improves operational reliability.
Detailed description of the invention
Fig. 1 is small current neutral grounding system main electrical scheme schematic diagram applied by the present invention；
Fig. 2 is the flow chart of present invention digitlization low-current line selection method；
Fig. 3 is the configuration diagram of present invention digitlization small current line selection system.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
Small current neutral grounding system include isolated neutral, through grounding through arc, through forms such as high resistance grounds, Fig. 1 is
By taking the typical case of neutral by arc extinction coil grounding as an example.L1-L5 is 5 routes in the power supply system in Fig. 1, practical
5 are not limited in system.Since neutral point is non-effective earthing, when not having arc suppression coil compensation, non-fault line flows through
The capacitive earth current of itself, faulty line flow through the sum of total system non-fault line capacitive earth current, but due to reality
Fault current still very little, feature are not obvious enough；Especially arc suppression coil compensation when, can to flowed through in faulty line zero sequence electricity
Stream compensates, and fault current can be smaller at this time, and fault signature is more unobvious.
Current existing a variety of earthing wire-selecting methods are by extracting the power frequency component in zero-sequence current, harmonic component or temporarily
State component etc., the difference between comprehensive analysis faulty line and non-fault line are compared to obtain route selection as a result, usually mostly
Failure line selection can be carried out by comparing the phase of each route zero-sequence current using phase comparing method as one of main selection method, but
The premise of phase comparing method route selection is to require the zero sequence CT polarity of each route must be consistent, and there are zero sequence CT polarity to be difficult to verify at scene
The problem of, this results in all selection methods based on phase comparing method to be all restricted；The usual cable access bus electricity of line selection apparatus
The zero-sequence current of pressure and substation's whole route, which is concentrated, to be implemented, this causes, and field connection is complicated various and there are secondary cable broken strings
Or when virtual connection can not Realtime Alerts the problems such as.
A kind of process of digitlization earthing wire-selecting method proposed by the invention refers to Fig. 2, mainly there is following four steps：
Step 1：The three-phase current, voltage and zero-sequence current that the acquisition output device of each route of substation completes this interval are adopted
Sample；
The acquisition output device of each route of substation completes three-phase current, voltage, zero-sequence current analog acquisition, is generally not required to again
Other electrical quantity are accessed, if scene can also be synthesized in the access of no zero-sequence current by three-phase current software.
Step 2：Substation respectively acquires output device and carries out zero sequence CT polarity discriminating, automatic to correct sampled data and be sent to
Line selection apparatus；
Since zero-sequence current generally just will appear in ground fault, the polarity access of zero sequence CT is difficult to school when whether correct normal
It tests, this will lead to the selection method accuracy rate based on phase comparing method and is greatly lowered.For acquiring output device, three have been accessed at the same time
After phase current, voltage and zero-sequence current, can by the self-produced zero-sequence current of three-phase current and the zero-sequence current of external access into
Row compares, and whether its phase of automatic Verification is correct.Acquire output three-phase current relative to the polarity of three-phase voltage be all by
It correctly verifies, therefore self-produced zero-sequence current meets relative to the polarity of self-produced residual voltage and correctly verifies.Normal condition
Under, self-produced zero-sequence current all should should be essentially identical with the phase and amplitude of external zero-sequence current.Ground fault occurs
When, program more self-produced zero-sequence current and phase of the external zero-sequence current relative to self-produced residual voltage automatically can differentiate zero
Whether polarity access is wrong for sequence electric current, if polarity is wrong, issues alarm signal, while to the external zero sequence of ground fault electricity
Stream phase property amount is automatically corrected on the basis of phase of the self-produced zero-sequence current relative to self-produced residual voltage.By this
Automatic Verification and automatic amendment, it is ensured that the ground fault phase property amount polarity of each route of substation is consistent.
Sampled data transmission is transmitted using IEC60044-8 agreement, the spy that IEC60044-8 agreement has transmission delay fixed
Point is applicable to realize synchronized sampling using resampling technique between different device.
Step 3：Line selection apparatus samples bus residual voltage data on the spot, receives what each route acquisition output device was sent
Sampled data simultaneously synchronizes processing to data using interpolation method for resampling；
Needed for line selection apparatus each route zero-sequence current sampled data, be by different acquisition output device offers belong to across
Every sampling, the problem of this just brings sample-synchronous between multiple devices.The transmission delay of IEC60044-8 agreement is constant time lag,
The method that interpolation resampling can be used synchronizes.By tracking line selection apparatus and each acquisition output device system clock,
By each asynchronous point（Acquire output device system clock）Sampled data is interpolated into synchronous point using Lagrange interpolation method（Route selection
Apparatus system clock）, to realize that across interval sampling data are synchronous.
Step 4：Line selection apparatus adopts each route zero-sequence current and busbar voltage data after synchronization process
Than width method, transient power direction method comprehensive comparative analysis fault wire is selected with the transient state phase comparing method based on wavelet package transforms, transient state
Road, and GOOSE trip signal is sent to route acquisition output device, acquisition output device receives what line selection apparatus was sent
After GOOSE trip signal, isolated fault of tripping.
For example, P0 is line-selected earthing device in Fig. 3, L1-L5 is 5 routes, and P1-P5 is the acquisition of respective lines
Output device.Sampled data needed for line selection apparatus P0 is transferred to line selection apparatus, route selection by optical fiber by each acquisition output device
Device in-site collecting bus residual voltage data, and the sampled data that each route acquisition output device is sent is received, utilize weight
The method of sampling carries out sampling data synchronization.When L3 ground fault occurs, line selection apparatus P0 compares width by transient state phase comparing method, transient state
Method, transient power direction method comprehensive comparative analysis select faulty line L3, and send GOOSE to L3 route acquisition output device and jump
Lock order, after corresponding acquisition output device gets GOOSE trip signal from GOOSE communication network, tripping L3 route is realized
Failure line selection.
To sum up, a kind of digitlization small current earthing wire-selecting method proposed by the present invention can be realized in small current neutral grounding system and be connect
Earth fault route selection corrects sampled data by the polarity of automatic discrimination zero sequence CT, solves what live zero sequence CT polarity was difficult to verify
Problem improves phase comparing method route selection accuracy rate；In addition each device is in addition to DC power supply itself is using cable connection, remaining communication group
Net is all optical fiber, to substantially reduce secondary cable quantity, and realizes channel real-time monitoring alarming function.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (5)
1. a kind of digitlization small current earthing wire-selecting method, which is characterized in that small current neutral grounding system configures line selection apparatus, system
Each line configuring acquires output device, and the method comprises the following steps：
Step 1：The acquisition output device of each route completes three-phase current, voltage and the zero-sequence current sampling at this interval；
Step 2：The acquisition output device of each route carries out zero sequence CT polarity discriminating and corrects sampled data automatically, and will be revised
Sampling data transmitting gives line selection apparatus；
Step 3：Line selection apparatus samples bus residual voltage data, receives the sampled data that each route acquisition output device is sent
And processing is synchronized to data；
Step 4：Line selection apparatus selects faulty line to the data after synchronization process, using transient arithmetic comprehensive comparative analysis, and
GOOSE trip signal is sent to route acquisition output device, corresponding acquisition output device receives GOOSE trip signal, jumps
Lock isolated fault.
2. a kind of digitlization small current earthing wire-selecting method as described in claim 1, which is characterized in that adopted in the step 2
Sample data are sent to line selection apparatus, are to be sent using fiber optic point to point mode, IEC60044-8 agreement is used when transmission.
3. a kind of digitlization small current earthing wire-selecting method as described in claim 1, which is characterized in that in the step 2
Acquisition output device carries out zero sequence CT polarity discriminating and corrects sampled data automatically, and specific method is to adopt when ground fault occurs
Collect output device more self-produced zero-sequence current and phase of the external zero-sequence current relative to self-produced residual voltage automatically, differentiates zero sequence
Whether polarity access is wrong for electric current, if polarity is wrong, to the zero-sequence current phase property amount of ground fault with self-produced zero sequence
Electric current is automatically corrected on the basis of the phase relative to self-produced residual voltage.
4. a kind of digitlization small current earthing wire-selecting method according to claim 1, which is characterized in that in the step 3
The sampled data that line selection apparatus sends acquisition output device completes synchronization process using Lagrange interpolation method resampling.
5. a kind of digitlization small current earthing wire-selecting method according to claim 1, which is characterized in that in the step 4
Transient arithmetic include：Transient state phase comparing method, transient state based on wavelet package transforms are than width method, transient power direction method.
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| CN109617235A (en) * | 2018-12-14 | 2019-04-12 | 上海君世电气科技有限公司 | A kind of Little Current Ground Connection System of frequency-tracking and dynamic arrangements |
| CN109888747A (en) * | 2019-03-12 | 2019-06-14 | 南京南瑞继保电气有限公司 | A kind of distribution earthing wire-selecting system and method |
| CN109980614A (en) * | 2019-03-29 | 2019-07-05 | 广东电网有限责任公司 | A kind of distribution line zero-sequenceprotection direction-adaptive method of discrimination |
| CN110907758A (en) * | 2019-12-06 | 2020-03-24 | 国电南瑞科技股份有限公司 | Small current ground fault line selection method covering CT polarity self-correction |
| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN111398871A (en) * | 2020-04-07 | 2020-07-10 | 国家电网有限公司 | Device and method for checking polarity of zero sequence current transformer |
| CN111505438A (en) * | 2020-04-17 | 2020-08-07 | 南京南瑞继保电气有限公司 | Improved self-adaptive feeder automation method |
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| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN110927631B (en) * | 2019-12-03 | 2022-01-11 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
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| CN110907758B (en) * | 2019-12-06 | 2021-10-22 | 国电南瑞科技股份有限公司 | Small current ground fault line selection method covering CT polarity self-correction |
| CN111398871A (en) * | 2020-04-07 | 2020-07-10 | 国家电网有限公司 | Device and method for checking polarity of zero sequence current transformer |
| CN111505438A (en) * | 2020-04-17 | 2020-08-07 | 南京南瑞继保电气有限公司 | Improved self-adaptive feeder automation method |
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