CN104297636A - Pole-mounted distribution substation traveling wave detection method - Google Patents
Pole-mounted distribution substation traveling wave detection method Download PDFInfo
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- CN104297636A CN104297636A CN201410572906.0A CN201410572906A CN104297636A CN 104297636 A CN104297636 A CN 104297636A CN 201410572906 A CN201410572906 A CN 201410572906A CN 104297636 A CN104297636 A CN 104297636A
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- traveling wave
- band component
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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 the direct electric power networks be closely connected with user side, is responsible for the vital task of powering for people's lives and commercial production, and power distribution network, once break down, will affect the people and produce and life, even the impact person and device security; If fault is removed not in time, will expand further by causing trouble, cause large area blackout.For this reason, operation of power networks personnel must carry out localization of fault within the shortest time, localization of faults position, search line fault point, remove fault, recover electrical network as early as possible and normally run.
The capable ripple location technology of distribution network failure is the direction of current power distribution network fault detection technique development, the correct time difference utilizing fault traveling wave to arrive distribution substation on distribution network line end post calculates distribution network failure point accurate location, at this wherein, on post, the detection and identification of distribution substation travelling wave signal is the key realizing the capable ripple location technology of distribution network failure.
Both at home and abroad to power circuit and the existing further investigation of substation fault traveling wave detector technology, be divided into current traveling wave detection technique and voltage traveling wave detection technique two research directions: the power transmission network widespread use at home of current traveling wave detection technique, directly from substation line or busbar current transformer secondary side high speed acquisition current signal, adopt wavelet analysis method Detection and identification current traveling wave signal.But according to traveling wave principle, current traveling wave distribution substation (only having a high-voltage terminal) on distribution network line end post will be totally reflected, reflection wave is contrary with incident wave polarity, cancel out each other is zero, cause current traveling wave method to there is distribution substation traveling wave detector blind area on post, distribution substation traveling wave detector on post can not be applicable to; Voltage traveling wave detection technique is power transmission network widespread use at home also, usually needs to develop special traveling wave sensor, connects or is socketed on CVT ground wire, extracts voltage traveling wave signal.Because on power distribution network end post, distribution substation does not adopt CVT device, existing voltage traveling wave detection technique can not be applicable to distribution substation traveling wave detector on post.
Summary of the invention
Technical matters to be solved by this invention, be just to provide a kind of distribution substation traveling wave detector method on post, it can support electric network functional failure travelling wave location technology being applicable at power distribution network, effectively improves the on-line monitoring level of distribution line failure.
Solve the problems of the technologies described above, 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:
S1, on post, distribution substation ground wire installs current transformer;
The high band component amplitude I of S2 continuous coverage Current Transformer Secondary side output signal
1if be greater than high band component amplitude setting valve I
1S, then I is judged
1for power distribution network transient state jump signal;
S3 calculates power distribution network transient state jump signal and occurs rear delay time t
1the high band component energy value E of interior Current Transformer Secondary side output signal
1delay time t after occurring with power distribution network transient state jump signal
2the low frequency band component energy value E of interior Current Transformer Secondary side output signal
2;
If S4 high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2be less than its setting valve E
2S, be then detected as high voltage side of transformer distribution network failure and produce and the fault traveling wave signal being transferred to distribution substation on post;
If high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2also its setting valve E is greater than
2S, be then detected as step down side distribution network failure and produce and the fault traveling wave signal being transferred to distribution substation on post.
The frequency band selection range of described step S2 higher frequency band component is [f
3, f
4], wherein lower frequency limit f
3selection range is [5kHz, 100kHz], upper limiting frequency f
4selection range is [1MHz, 10MHz].
Described step S2 higher frequency band component amplitude setting valve I
1Sdefining method be: Current Transformer Secondary side output signal midband [f under measuring respectively or calculating pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault condition, under overhead transmission line insulator 2A transient current discharge fault condition, under cable line 2A transient current partial discharges fault condition
3, f
4] amplitude of component, getting wherein reckling is high band component amplitude setting valve.
The frequency band selection range of described step S3 low-frequency band component is [f
1, f
2], wherein lower frequency limit f
1selection range is [0Hz, 30Hz], upper limiting frequency f
2selection range is [100Hz, 300Hz].
Delay time t in described step S3
1interior selection range is [0.1ms, 5ms], delay time t
2interior selection range is [10ms, 40ms].
Described step S4 high band component energy setting valve E
1Sdefining method be: Current Transformer Secondary side output signal high frequency band [f under measuring respectively or calculating pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault condition, under overhead transmission line insulator 2A transient current discharge fault condition, under cable line 2A transient current partial discharges fault condition
3, f
4] energy value of component, getting wherein reckling is high band component energy setting valve.
Described step S4 low frequency band component energy setting valve E
2Sdefining method be: measure respectively or calculate Zhu Shang transformer station 1 kilo-ohm, low tension outlet place high resistant over the ground under fault condition, Current Transformer Secondary side output signal low-frequency band [f under phase line Leaked Current of Line to Ground mutation current 200mA condition
1, f
2] energy value of component, getting wherein reckling is low frequency band component energy setting valve.
The demonstration of the inventive method is as follows: after power distribution network breaks down, and trouble spot produces fault traveling wave signal, comprises wide area subband-signal component, propagates along power circuit to whole electrical network, and traveling wave speed is fast, decay is large, and is subject to external interference.For this reason, the present invention sets three travelling wave signal detection criteria, and a criterion detects high band component amplitude, is conducive to the transient state jump signal of fast detecting failure wavefront, can be used for the accurate recording of fault traveling wave time of arrival; Criterion detects high band component energy value, because high-frequency interferencing signal general persistence is short, energy is little, adopts high-band energy criterion can distinguish fault traveling wave signal and electromagnetic interference (EMI), do not cause the induced lightening isopulse signal of line fault; Another criterion is the detection of low frequency band component energy, due to the neutral point of substation low-voltage side on the direct joint pin of ground wire, low voltage electric network will produce low frequency (comprising power frequency) current signal to earth fault on ground wire, and high voltage side of transformer electrical network and ground wire are coupled by means of only distribution parameter, the low frequency signal that high voltage side of transformer distribution network failure produces on ground wire is little, therefore adopts low-frequency band energy criterion can distinguish high voltage side of transformer distribution network failure travelling wave signal and low-pressure side distribution network failure travelling wave signal.
Technique effect of the present invention is: can meet the detection to multiple high voltage distribution line failures such as high voltage distribution network overhead transmission line insulator breakdown fault, pollution flashover and cable line partial discharges fault; and energy identification low voltage electric network fault; have that accuracy of detection is high, cost is low, simple installation, be easy to the advantage applied, can be used for electric network functional failure travelling wave protection and location.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, further explanation is believed to the present invention.
Fig. 1 is distribution substation traveling wave detector schematic diagram on post of the present invention;
Fig. 2 is the realistic model figure of substation transformer on post of the present invention;
Fig. 3 is distribution substation traveling wave detector process flow diagram on 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 waveform of Current Transformer Secondary signal before and after high voltage distribution network fault;
Fig. 6 is low-frequency band [0Hz, the 280Hz] component waveform of Current Transformer Secondary signal before and after high voltage distribution network fault.
Embodiment
On post of the present invention, distribution substation traveling wave detector schematic diagram as shown in Figure 1.On post, the high-voltage side outlet wire of distribution substation is connected ground wire with low-voltage side outlet respectively by after lightning arrester, low-pressure side neutral point directly connects ground wire, transformer case also directly connects ground wire, ground wire installs current transformer, detect the high fdrequency component amplitude of mutual inductor secondary side current signal and the energy of energy and low frequency component, identification distribution network failure travelling wave signal.
See Fig. 3, distribution substation traveling wave detector embodiment of the method on post of the present invention, comprises the following steps:
S1, on post, distribution substation ground wire installs current transformer;
The high band component amplitude I of S2 continuous coverage Current Transformer Secondary side output signal
1if be greater than high band component amplitude setting valve I
1S, then I is judged
1for power distribution network transient state jump signal;
The frequency band selection range of high band component is [f
3, f
4], wherein lower frequency limit f
3selection range is [5kHz, 100kHz], upper limiting frequency f
4selection range is [1MHz, 10MHz].
High band component amplitude setting valve I
1Sdefining method be: Current Transformer Secondary side output signal midband [f under measuring respectively or calculating pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault condition, under overhead transmission line insulator 2 amperes of transient current discharge fault conditions, under cable line 2A transient current partial discharges fault condition
3, f
4] amplitude of component, getting wherein reckling is high band component amplitude setting valve.
S3 calculates power distribution network transient state jump signal and occurs rear delay time t
1the high band component energy value E of interior Current Transformer Secondary side output signal
1delay time t after occurring with power distribution network transient state jump signal
2the low frequency band component energy value E of interior Current Transformer Secondary side output signal
2;
The frequency band selection range of low frequency band component is [f
1, f
2], wherein lower frequency limit f
1selection range is [0Hz, 30Hz], upper limiting frequency f
2selection range is [100Hz, 300Hz].
Delay time t
1interior selection range is [0.1ms, 5ms], delay time t
2interior selection range is [10ms, 40ms].
Calculating energy value is prior art, ripe application.
If S4 high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2be less than its setting valve E
2S, be then detected as high voltage side of transformer distribution network failure and produce and the fault traveling wave signal being transferred to distribution substation on post;
If high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2also its setting valve E is greater than
2S, be then detected as step down side distribution network failure and produce and the fault traveling wave signal being transferred to distribution substation on post.
High band component energy setting valve E
1Sdefining method be: Current Transformer Secondary side output signal high frequency band [f under measuring respectively or calculating pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault condition, under overhead transmission line insulator 2A transient current discharge fault condition, under cable line 2A transient current partial discharges fault condition
3, f
4] energy value of component, getting wherein reckling is high band component energy setting valve.
Low frequency band component energy setting valve E
2Sdefining method be: measure respectively or calculate Zhu Shang transformer station 1 kilo-ohm, low tension outlet place high resistant over the ground under fault condition, Current Transformer Secondary side output signal low-frequency band [f under phase line Leaked Current of Line to Ground mutation current 200mA condition
1, f
2] energy value of component, getting wherein reckling is low frequency band component energy setting valve.
Simulating, verifying
On the post choosing 10kV/380V, distribution substation is that example carries out simulation analysis, and Fig. 2 is the realistic model of substation transformer on this post.
R in figure
1, R
2be respectively the genesis analysis resistance of 10kV high-pressure side and 380V low-voltage side coil, C
1, C
2be respectively the genesis analysis electric capacity of distribution substation 10kV high-pressure side and 380V low-voltage side coil on post, C
12for the distributed capacitance between high-tension coil and low-voltage coil, C
10for the distributed capacitance between high-tension coil and shell, C
30for the distributed capacitance between low-voltage coil and iron core, L
1, L
2be respectively the distributed inductance (comprising self-induction and turn-to-turn mutual inductance) of 10kV side and 380V lateral coil.
First simulation calculation setting valve, adopts electromagnetic transient simulation analysis software EMTP and general-purpose computations software MATLAB simulation analysis and the electromagnetic transient of distribution substation on calculating chart 1 post.
The fault electromagnetic transient of simulation calculation pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault, overhead transmission line insulator 2A transient current discharge fault, cable line 2A transient current partial discharges fault respectively;
Calculate the amplitude of output signal high frequency band [10kHz, 5MHz] component in Current Transformer Secondary side under above-mentioned three kinds of fault conditions, and utilize formula E=∫ I
2dt calculates the energy that high frequency band [10kHz, 5MHz] component in rear 1ms occurs above-mentioned three kinds of faults respectively, and getting wherein minimum high band component amplitude is amplitude setting valve I
1S=0.87A, getting wherein minimum high band component energy value is high band component energy setting valve E
1S=8.45 × 10
-5j; And difference simulation analysis Zhu Shang transformer station 1 kilo-ohm, low tension outlet place high resistant is to the electromagnetic transient of earth fault, phase line Leaked Current of Line to Ground mutation current 200mA;
Recycling formula E=∫ I
2dt calculates the energy value that output signal low-frequency band [0Hz, 280Hz] component in Current Transformer Secondary side in rear 30ms occurs above-mentioned two kinds of faults respectively, and getting wherein reckling is low-frequency band [0Hz, 280Hz] component energy setting valve E
2S=6.86 × 10
-4j.
On post of the present invention, distribution substation traveling wave detector process flow diagram as shown in Figure 3.Distribution substation ground wire installs current transformer to line end post, high frequency band [10kHz, 5MHz] the component amplitude I of continuous coverage Current Transformer Secondary side output signal
1.
The identification process of simulation analysis one high voltage distribution network fault traveling wave: electromagnetic transient simulation obtains the Current Transformer Secondary signal waveform of 30ms after 3ms and fault before high voltage distribution network fault as shown in Figure 4, filtering obtains the high frequency band [10kHz of Current Transformer Secondary side output signal, 5MHz] component, wherein before fault, after 0.1ms and fault, the waveform of 1ms as shown in Figure 5, measures this high band component amplitude I
1for 34.1A, be greater than the high band component amplitude setting valve I of setting
1S(0.87A) fault transient jump signal, is judged as; Utilize formula E=∫ I
2dt calculates the energy value E that high frequency band [10kHz, 5MHz] component in rear 1ms occurs fault
1, size is 0.126J, is greater than high band component energy setting valve E
1S(8.45 × 10
-5j); Filtering obtains low-frequency band [0Hz, the 280Hz] component of Current Transformer Secondary side output signal, and wherein before fault, after 3ms and fault, the waveform of 30ms as shown in Figure 6, utilizes formula E=∫ I
2dt calculates the energy value E that low-frequency band [0Hz, 280Hz] component in rear 30ms occurs fault
2, size is 2.25 × 10
-5j, is less than low frequency band component energy setting valve E
2S(6.86 × 10
-4j); Then high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2be less than its setting valve E
2S, detect and to produce from high voltage side of transformer distribution network failure and to be transferred to the fault traveling wave signal of distribution substation on post.
From above-mentioned analysis of simulation experiment, on post of the present invention, distribution substation traveling wave detector method only distribution substation ground wire need be installed a current transformer on post and can be realized, and has that antijamming capability is strong, economical and convenient, is easy to the advantage applied.
Claims (7)
1. a distribution substation traveling wave detector method on post, is characterized in that comprising the following steps:
S1, on post, distribution substation ground wire installs current transformer;
The high band component amplitude I of S2 continuous coverage Current Transformer Secondary side output signal
1if be greater than high band component amplitude setting valve I
1S, then I is judged
1for power distribution network transient state jump signal;
S3 calculates power distribution network transient state jump signal and occurs rear delay time t
1the high band component energy value E of interior Current Transformer Secondary side output signal
1delay time t after occurring with power distribution network transient state jump signal
2the low frequency band component energy value E of interior Current Transformer Secondary side output signal
2;
If S4 high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2be less than its setting valve E
2S, be then detected as high voltage side of transformer distribution network failure and produce and the fault traveling wave signal being transferred to distribution substation on post;
If high-band energy value E
1be greater than its setting valve E
1Sand low-frequency band ENERGY E
2also its setting valve E is greater than
2S, be then detected as step down side distribution network failure and produce and the fault traveling wave signal being transferred to distribution substation on post.
2. distribution substation traveling wave detector method on post according to claim 1, is characterized in that: the frequency band selection range of described step S2 higher frequency band component is [f
3, f
4], wherein lower frequency limit f
3selection range is [5kHz, 100kHz], upper limiting frequency f
4selection range is [1MHz, 10MHz].
3. distribution substation traveling wave detector method on post according to claim 1, is characterized in that: described step S2 higher frequency band component amplitude setting valve I
1Sdefining method be: Current Transformer Secondary side output signal midband [f under measuring respectively or calculating pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault condition, under overhead transmission line insulator 2A transient current discharge fault condition, under cable line 2A transient current partial discharges fault condition
3, f
4] amplitude of component, getting wherein reckling is high band component amplitude setting valve.
4. distribution substation traveling wave detector method on post according to claim 1, is characterized in that: the frequency band selection range of described step S3 low-frequency band component is [f
1, f
2], wherein lower frequency limit f
1selection range is [0Hz, 30Hz], upper limiting frequency f
2selection range is [100Hz, 300Hz].
5. distribution substation traveling wave detector method on post according to claim 1, is characterized in that: the delay time t in described step S3
1interior selection range is [0.1ms, 5ms], delay time t
2interior 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 band component energy setting valve E
1Sdefining method be: Current Transformer Secondary side output signal high frequency band [f under measuring respectively or calculating pole type transformer high pressure side outlet place overhead transmission line 1 insulator breakdown fault condition, under overhead transmission line insulator 2A transient current discharge fault condition, under cable line 2A transient current partial discharges fault condition
3, f
4] energy value of component, getting wherein reckling 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 E
2Sdefining method be: measure respectively or calculate Zhu Shang transformer station 1 kilo-ohm, low tension outlet place high resistant over the ground under fault condition, Current Transformer Secondary side output signal low-frequency band [f under phase line Leaked Current of Line to Ground mutation current 200mA condition
1, f
2] energy value of component, getting wherein reckling is low frequency band component energy setting valve.
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|---|---|---|---|
| CN201410572906.0A CN104297636B (en) | 2014-10-23 | 2014-10-23 | Pole-mounted distribution substation traveling wave detection method |
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