CN104297636B - Pole-mounted distribution substation traveling wave detection method - Google Patents
Pole-mounted distribution substation traveling wave detection method Download PDFInfo
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- CN104297636B CN104297636B CN201410572906.0A CN201410572906A CN104297636B CN 104297636 B CN104297636 B CN 104297636B CN 201410572906 A CN201410572906 A CN 201410572906A CN 104297636 B CN104297636 B CN 104297636B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to a pole-mounted distribution substation traveling wave detection method. The pole-mounted distribution substation traveling wave detection method comprises the steps that the high-frequency band component amplitude of the current on a grounding line of a pole-mounted distribution substation is measured, and if the high-frequency band component amplitude is larger than a set value of the high-frequency band component amplitude, the high-frequency band component amplitude is judged to be a distribution network transient state jump signal; the energy value of a high-frequency band component and the energy value of a low-frequency band component of the current of the grounding wire after the transient state jump signal appears are calculated respectively, and if the energy value of the high-frequency band component is larger than a set value of the energy value of the high-frequency band component and the energy value of the low-frequency band component is smaller that a set value of the energy value of the low-frequency band component, it is detected that a fault of a distribution network on the high-voltage side of a transformer is generated, and a fault traveling wave signal is transmitted to the pole-mounted distribution substation; if the energy value of the high-frequency band component and the energy value of the low-frequency band component are larger than the respectively set values, it is detected that a fault of the distribution network on the low-voltage side of the transformer is generated, and a fault traveling wave signal is transmitted to the pole-mounted distribution substation. The pole-mounted distribution substation traveling wave detection method has the advantages that the traveling wave detection precision is high, the manufacturing cost is low, installation is easy and convenient, and application and popularization are easy. The pole-mounted distribution substation traveling wave detection method can be used for power grid fault traveling wave protecting and positioning.
Description
Technical field
The present invention relates to a kind of distribution substation traveling wave detector method on post.
Background technology
Power distribution network, as directly closely coupled with user side electric power networks, is responsible for and is supplied with commercial production for people's lives
The vital task of electricity, power distribution network once breaks down, and will affect the people and produce and live, or even the impact person and equipment safety；
If fault is removed not in time, it will causing trouble expands further, cause large area blackout.For this reason, operation of power networks personnel
Fault location, localization of faults position must be carried out within the shortest time, search line fault point, remove fault, recover as early as possible
Electrical network normally runs.
Distribution network failure traveling wave location technology is the direction of current power distribution network fault detection technique development, using fault traveling wave
The correct time difference reaching distribution substation on distribution network line end post calculates distribution network failure point accurate location, this its
In, on post, the detection of distribution substation travelling wave signal and identification are the keys realizing distribution network failure traveling wave location technology.
Both at home and abroad power circuit and substation fault traveling wave detector technology are furtherd investigate, be divided into current traveling wave to detect
Technology and two research directions of voltage traveling wave detection technique：Current traveling wave detection technique at home power transmission network extensively apply, directly
Connect from substation line or busbar current transformer secondary side high speed acquisition current signal, detected using wavelet analysis method and distinguish
Know current traveling wave signal.But according to traveling wave principle, distribution substation is (only on the post of distribution network line end for current traveling wave
Article one, high-voltage terminal) will be totally reflected, echo and incidence wave opposite polarity, cancelling out each other is zero, leads to current traveling wave method
There is distribution substation traveling wave detector blind area on post it is impossible to be applied to distribution substation traveling wave detector on post；Voltage traveling wave detects
Technology also at home power transmission network extensively apply, it usually needs develop special traveling wave sensor, connect or be socketed in CVT ground wire
On, extract voltage traveling wave signal.Because on the post of power distribution network end, distribution substation does not adopt CVT device, existing voltage traveling wave inspection
Survey technology nor be applied to distribution substation traveling wave detector on post.
Content of the invention
The technical problem to be solved is it is simply that provide a kind of distribution substation traveling wave detector method on post, it can
Support electric network functional failure travelling wave location technology in the popularization and application of power distribution network, effectively increase the on-line monitoring water of distribution line failure
Flat.
Solve above-mentioned technical problem, the technical solution used in the present invention is as follows：
A kind of distribution substation traveling wave detector method on post, is characterized in that comprising the following steps：
Current transformer is installed on S1 distribution substation earth lead on post；
High band component amplitude I of S2 continuous measurement current transform er secondary side output signal1, divide if greater than high frequency band
Amount amplitude setting valve I1S, then judge I1For power distribution network transient mutation signal；
S3 calculates delay time t after power distribution network transient mutation signal occurs1Interior Current Transformer Secondary side output signal
High band component energy value E1Delay time t after occurring with power distribution network transient mutation signal2Interior Current Transformer Secondary side output letter
Number low frequency band component energy value E2；
If S4 high-band energy value E1More than its setting valve E1SAnd low-frequency band ENERGY E2Less than its setting valve E2S, then detect
Produce and be transferred to the fault traveling wave signal of distribution substation on post for high voltage side of transformer distribution network failure；
If high-band energy value E1More than its setting valve E1SAnd low-frequency band ENERGY E2Also greater than its setting valve E2S, then detect
Produce and be transferred to the fault traveling wave signal of distribution substation on post for step down side distribution network failure.
The frequency band selection range of described step S2 higher frequency band component is [f3, f4], wherein lower frequency limit f3Selection range is
[5kHz, 100kHz], upper limiting frequency f4Selection range is [1MHz, 10MHz].
Described step S2 higher frequency band component amplitude setting valve I1SDetermination method be：Measure respectively or calculate transformation on post
Under 1 insulator breakdown fault condition of overhead transmission line at device high pressure side outlet, overhead transmission line insulator 2A transient current electric discharge therefore
Current Transformer Secondary side output signal midband under the conditions of barrier, under the conditions of cable run 2A transient current partial discharges fault
[f3, f4] component amplitude, take wherein reckling be high band component amplitude setting valve.
The frequency band selection range of described step S3 low-frequency band component is [f1, f2], wherein lower frequency limit f1Selection range is
[0Hz, 30Hz], upper limiting frequency f2Selection range is [100Hz, 300Hz].
Delay time t in described step S31Interior selection range is [0.1ms, 5ms], delay time t2Interior selection range is
[10ms, 40ms].
Described step S4 high band component energy setting valve E1SDetermination method be：Measure respectively or calculate pole type transformer
Under 1 insulator breakdown fault condition of overhead transmission line at high pressure side outlet, overhead transmission line insulator 2A transient current discharge fault
Under the conditions of, Current Transformer Secondary side output signal high frequency band [f under the conditions of cable run 2A transient current partial discharges fault3,
f4] component energy value, take wherein reckling be high band component energy setting valve.
Described step S4 low frequency band component energy setting valve E2SDetermination method be：Measure respectively or calculate Zhu Shang transformer station
At low tension outlet 1 kilo-ohm of high resistant over the ground under fault condition, current transformer two under the conditions of phase line Leaked Current of Line to Ground mutation current 200mA
Secondary side output signal low-frequency band [f1, f2] component energy value, take wherein reckling be low frequency band component energy setting valve.
The demonstration of the inventive method is as follows：After power distribution network breaks down, trouble point produces fault traveling wave signal, including wide area
Subband-signal component, propagates along power circuit to whole electrical network, and traveling wave speed is fast, decay is big, and is easily subject to external interference.For
This, the present invention sets three travelling wave signal detection criteria, and a criterion is detection high band component amplitude, is conducive to quick detection
The transient mutation signal of fault traveling wave wave head, can be used for the accurate recording of the fault traveling wave time of advent；One criterion is that detection is high
Band component energy value, because high-frequency interferencing signal general persistence is short, energy is little, can be distinguished using high-band energy criterion
Fault traveling wave signal and electromagnetic interference, do not cause the induced lightening isopulse signal of line fault；Another criterion is that low-frequency band is divided
The detection of energy, because earth lead is directly connected to the neutral point of substation low-voltage side on post, low voltage electric network will be to earth fault
Produce low frequency (inclusion power frequency) current signal on earth lead, and high voltage side of transformer electrical network and earth lead only pass through distributed constant coupling
Close, the low frequency signal that high voltage side of transformer distribution network failure produces on earth lead is little, therefore can using low-frequency band energy criterion
To distinguish high voltage side of transformer distribution network failure travelling wave signal and low-pressure side distribution network failure travelling wave signal.
The method have technical effect that：Can meet to high voltage distribution network overhead transmission line insulator breakdown fault, pollution flashover and
The detection of multiple high voltage distribution line failure such as cable run partial discharges fault, and low voltage electric network fault can be recognized, there is inspection
Survey high precision, low cost, simple installation, the advantage of application easy to spread, can be used for electric network functional failure travelling wave protection and positioning.
Brief description
Below in conjunction with the accompanying drawings explanation is further believed to the present invention.
Fig. 1 is distribution substation traveling wave detector schematic diagram on the post of the present invention；
Fig. 2 is the phantom figure of distribution transformer on the post of the present invention；
Fig. 3 is distribution substation traveling wave detector flow chart on the post of the present invention；
Fig. 4 is Current Transformer Secondary signal waveform before and after high voltage distribution network fault；
Fig. 5 is high frequency band [10kHz, the 5MHz] component waves of Current Transformer Secondary signal before and after high voltage distribution network fault
Shape；
Fig. 6 is low-frequency band [0Hz, the 280Hz] component waveform of Current Transformer Secondary signal before and after high voltage distribution network fault.
Specific embodiment
On the post of the present invention, distribution substation traveling wave detector schematic diagram is as shown in Figure 1.The high-pressure side of distribution substation on post
Outlet and low-voltage side outlet connect earth lead respectively after spark gap, and low-pressure side neutral point is directly connected to earth lead, transformator
Shell is also directly connected to earth lead, installs current transformer, the high frequency of detection transformer secondary side current signal on earth lead
Component amplitude and the energy of energy and low frequency component, recognize distribution network failure travelling wave signal.
Referring to Fig. 3, on the post of the present invention, distribution substation traveling wave detector embodiment of the method, comprises the following steps：
Current transformer is installed on S1 distribution substation earth lead on post；
High band component amplitude I of S2 continuous measurement current transform er secondary side output signal1, divide if greater than high frequency band
Amount amplitude setting valve I1S, then judge I1For power distribution network transient mutation signal；
The frequency band selection range of high band component is [f3, f4], wherein lower frequency limit f3Selection range be [5kHz,
100kHz], upper limiting frequency f4Selection range is [1MHz, 10MHz].
High band component amplitude setting valve I1SDetermination method be：Measure respectively or calculate pole type transformer high pressure side outlet
Under place's 1 insulator breakdown fault condition of overhead transmission line, under the conditions of 2 amperes of transient current discharge faults of overhead transmission line insulator,
Current Transformer Secondary side output signal midband [f under the conditions of cable run 2A transient current partial discharges fault3, f4] component
Amplitude, take wherein reckling be high band component amplitude setting valve.
S3 calculates delay time t after power distribution network transient mutation signal occurs1Interior Current Transformer Secondary side output signal
High band component energy value E1Delay time t after occurring with power distribution network transient mutation signal2Interior Current Transformer Secondary side output letter
Number low frequency band component energy value E2；
The frequency band selection range of low frequency band component is [f1, f2], wherein lower frequency limit f1Selection range is [0Hz, 30Hz],
Upper limiting frequency f2Selection range is [100Hz, 300Hz].
Delay time t1Interior selection range is [0.1ms, 5ms], delay time t2Interior selection range is [10ms, 40ms].
Calculating energy value is prior art, ripe application.
If S4 high-band energy value E1More than its setting valve E1SAnd low-frequency band ENERGY E2Less than its setting valve E2S, then detect
Produce and be transferred to the fault traveling wave signal of distribution substation on post for high voltage side of transformer distribution network failure；
If high-band energy value E1More than its setting valve E1SAnd low-frequency band ENERGY E2Also greater than its setting valve E2S, then detect
Produce and be transferred to the fault traveling wave signal of distribution substation on post for step down side distribution network failure.
High band component energy setting valve E1SDetermination method be：Measure respectively or calculate pole type transformer high pressure side outlet
Place 1 insulator breakdown fault condition of overhead transmission line under, under the conditions of overhead transmission line insulator 2A transient current discharge fault, cable
Current Transformer Secondary side output signal high frequency band [f under the conditions of circuit 2A transient current partial discharges fault3, f4] component energy
Value, takes wherein reckling to be high band component energy setting valve.
Low frequency band component energy setting valve E2SDetermination method be：Measure respectively or calculate at Zhu Shang transformer station low tension outlet
1 kilo-ohm of high resistant over the ground under fault condition, output letter in Current Transformer Secondary side under the conditions of phase line Leaked Current of Line to Ground mutation current 200mA
Number low-frequency band [f1, f2] component energy value, take wherein reckling be low frequency band component energy setting valve.
Simulating, verifying
Choose distribution substation on the post of 10kV/380V and carry out simulation analysis for example, Fig. 2 is distribution transformer on this post
Phantom.
In figure R1、R2It is respectively the genesis analysis resistance of 10kV high-pressure side and 380V low-voltage side coil, C1、C2It is respectively post
Upper distribution substation 10kV high-pressure side and the genesis analysis electric capacity of 380V low-voltage side coil, C12For high-tension coil and low-voltage coil it
Between distribution capacity, C10For the distribution capacity between high-tension coil and shell, C30For the distribution electricity between low-voltage coil and iron core
Hold, L1、L2It is respectively the distributed inductance (including self-induction and turn-to-turn mutual inductance) of 10kV side and 380V lateral coil.
Simulation calculation setting valve first, is imitated using electromagnetic transient simulation analysis software EMTP and general-purpose computations software MATLAB
Really analyze and calculate the electromagnetic transient of distribution substation on Fig. 1 post.
Overhead transmission line 1 insulator breakdown fault, overhead transmission line at simulation calculation pole type transformer high pressure side outlet respectively
Insulator 2A transient current discharge fault, the fault electromagnetic transient of cable run 2A transient current partial discharges fault；
Calculate Current Transformer Secondary side output signal high frequency band [10kHz, 5MHz] component under above-mentioned three kinds of fault conditions
Amplitude, and utilize formula E=∫ I2Dt calculates high frequency band [10kHz, 5MHz] point in 1ms after above-mentioned three kinds of faults occur respectively
The energy of amount, takes wherein minimum high band component amplitude to be amplitude setting valve I1S=0.87A, takes wherein minimum high frequency band to divide
Energy value is high band component energy setting valve E1S=8.45 × 10-5J；And simulation analysis Zhu Shang transformer station low pressure goes out respectively
1 kilo-ohm of high resistant electromagnetic transient to earth fault, phase line Leaked Current of Line to Ground mutation current 200mA at mouthful；
Recycle formula E=∫ I2It is defeated that dt calculates Current Transformer Secondary side in 30ms after above two fault occurs respectively
Go out the energy value of signal low-frequency band [0Hz, 280Hz] component, take wherein reckling to be that low-frequency band [0Hz, 280Hz] component energy is whole
Definite value E2S=6.86 × 10-4J.
On the post of the present invention, distribution substation traveling wave detector flow chart is as shown in Figure 3.Distribution power transformation on line end post
Stand and current transformer, the high frequency band [10kHz, 5MHz] of continuous measurement current transform er secondary side output signal are installed on earth lead
Component amplitude I1.
The identification process of simulation analysis one high voltage distribution network fault traveling wave：Electromagnetic transient simulation obtains high voltage distribution network fault
After front 3ms and fault 30ms Current Transformer Secondary signal waveform as shown in figure 4, filtering to obtain Current Transformer Secondary side defeated
Go out high frequency band [10kHz, the 5MHz] component of signal, after 0.1ms and fault wherein before fault, the waveform of 1ms is as shown in figure 5, measurement
This high band component amplitude I1For 34.1A, more than the high band component amplitude setting valve I setting1S(0.87A), it is judged as fault
Transient mutation signal；Using formula E=∫ I2Dt calculates the energy of high frequency band [10kHz, 5MHz] component in 1ms after fault occurs
Value E1, size is 0.126J, more than high band component energy setting valve E1S(8.45×10-5J)；Filtering obtains current transformer two
Low-frequency band [0Hz, the 280Hz] component of secondary side output signal, after 3ms and fault wherein before fault 30ms waveform as shown in fig. 6,
Using formula E=∫ I2Dt calculates the energy value E of low-frequency band [0Hz, 280Hz] component in 30ms after fault occurs2, size is 2.25
×10-5J, less than low frequency band component energy setting valve E2S(6.86×10-4J)；Then high-band energy value E1More than its setting valve E1S
And low-frequency band ENERGY E2Less than its setting valve E2S, detect and produce from high voltage side of transformer distribution network failure and be transferred on post
The fault traveling wave signal of distribution substation.
From above-mentioned analysis of simulation experiment, on the post of the present invention, distribution substation traveling wave detector method only need to be joined on post
One current transformer is installed on electric transformer substation grounding wire can achieve, there is strong antijamming capability, economical and convenient, easy to spread
The advantage of application.
Claims (7)
1. a kind of distribution substation traveling wave detector method on post, is characterized in that comprising the following steps：
Current transformer is installed on S1 distribution substation earth lead on post；
High band component amplitude I of S2 continuous measurement current transform er secondary side output signal1, if greater than high band component width
Value setting valve I1S, then judge I1For power distribution network transient mutation signal；
S3 calculates delay time t after power distribution network transient mutation signal occurs1The high frequency band of interior Current Transformer Secondary side output signal
Component energy value E1Delay time t after occurring with power distribution network transient mutation signal2Interior Current Transformer Secondary side output signal low
Band component energy value E2；
If S4 is high band component energy value E1More than its setting valve E1SAnd low frequency band component energy value E2Less than its setting valve E2S,
Then it is detected as the fault traveling wave signal that high voltage side of transformer distribution network failure produces and is transferred to distribution substation on post；
If high band component energy value E1More than its setting valve E1SAnd low frequency band component energy value E2Also greater than its setting valve E2S,
Then it is detected as the fault traveling wave signal that step down side distribution network failure produces and is transferred to distribution substation on post.
2. distribution substation traveling wave detector method on post according to claim 1, is characterized in that：Described step S2 medium-high frequency
Frequency band selection range with component is [f5, f6], wherein lower frequency limit f5It is chosen for [5kHz], upper limiting frequency f6It is chosen for
[10MHz].
3. distribution substation traveling wave detector method on post according to claim 1, is characterized in that：Described step S2 medium-high frequency
Band component amplitude setting valve I1SDetermination method be：Measure respectively or calculate overhead transmission line 1 at pole type transformer high pressure side outlet
Under piece insulator breakdown fault condition, under the conditions of overhead transmission line insulator 2A transient current discharge fault, cable run 2A transient state
Output signal midband [f in Current Transformer Secondary side under the conditions of electric current partial discharges fault3, f4] component amplitude, take wherein
Little person is high band component amplitude setting valve.
4. distribution substation traveling wave detector method on post according to claim 1, is characterized in that：Described step S3 medium and low frequency
Frequency band selection range with component is [f1, f2], wherein lower frequency limit f1It is chosen for [0Hz], upper limiting frequency f2It is chosen for
[300Hz].
5. distribution substation traveling wave detector method on post according to claim 1, is characterized in that：Prolonging in described step S3
When time t1Interior selection range is [0.1ms, 5ms], delay time t2Interior selection range is [10ms, 40ms].
6. distribution substation traveling wave detector method on post according to claim 1, is characterized in that：Described step S4 high frequency band
Component energy setting valve E1SDetermination method be：Measure respectively or calculate overhead transmission line 1 at pole type transformer high pressure side outlet
Under insulator breakdown fault condition, under the conditions of overhead transmission line insulator 2A transient current discharge fault, cable run 2A transient state electricity
Current Transformer Secondary side output signal high frequency band [f under the conditions of stream partial discharges fault5, f6] component energy value, take wherein
Little person is high band component energy setting valve.
7. distribution substation traveling wave detector method on post according to claim 1, is characterized in that：Described step S4 low-frequency band
Component energy setting valve E2SDetermination method be：Measure or calculate at Zhu Shang transformer station low tension outlet 1 kilo-ohm of high resistant respectively over the ground
Current Transformer Secondary side output signal low-frequency band [f under fault condition, under the conditions of phase line Leaked Current of Line to Ground mutation current 200mA1,
f2] component energy value, take wherein reckling be low frequency band component energy setting valve.
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| CN106841877A (en) * | 2017-03-28 | 2017-06-13 | 海南电网有限责任公司 | Transformer hidden danger on-line monitoring method based on travelling wave current |
| CN113933749B (en) * | 2021-10-18 | 2023-06-16 | 广东电网有限责任公司东莞供电局 | Method, device, equipment and storage medium for detecting high-resistance ground fault of power distribution network |
| CN115128511B (en) * | 2022-06-27 | 2024-09-03 | 国网江苏省电力有限公司南京供电分公司 | Method and system for monitoring neutral point current of transformer of urban power system |
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