CN203688680U - Apparatus for detecting lightning stroke interference of cables in transformer station - Google Patents
Apparatus for detecting lightning stroke interference of cables in transformer station Download PDFInfo
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- CN203688680U CN203688680U CN201320728463.0U CN201320728463U CN203688680U CN 203688680 U CN203688680 U CN 203688680U CN 201320728463 U CN201320728463 U CN 201320728463U CN 203688680 U CN203688680 U CN 203688680U
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Abstract
The utility model discloses an apparatus for detecting lightning stroke interference of cables in a transformer station and belongs to the field of transformer station electromagnetic compatibility in power systems. The apparatus comprises a voltage divider circuit, a voltage comparator, a voltage holder, an A/D converting circuit, a host computer, and a computer. The apparatus identifies interference on the cables in a transformer station caused by lightning impulse and other interference sources, effectively filters interference such as noise or the like, requires few needed samples, short training time, and is free of overall optimal solution problems, and good in stypticity so as to be high in recognition rate. The apparatus provides a basis for taking effective measures to control and remove interference signals in secondary cables, and prevents maloperation or damage of secondary equipment connected with a cable.
Description
Technical field
The utility model belongs to power system transformer substation electromagnetic compatibility field, is specifically related to a kind of transformer station cable interference detecting apparatus that is struck by lightning.
Background technology
The electric system of current China is just towards high voltage, large capacity, intelligent direction development.And transformer station is as the assembly place of electric system power transmission and distribution; in limited space, collect numerous in secondary devices such as the primary equipments such as isolating switch, mutual inductor, lightning arrester and data acquisition system (DAS), communication system, relay protection systems; electromagnetic environment complexity, in electric system, the electromagnetic compatibility problem of transformer station becomes a key factor guaranteeing power system security reliability service.Along with Automatization Technology in Transformer Substation improves day by day, the microminiaturization of secondary device, digitizing, networking, also increased the susceptibility of secondary device to electromagnetic interference (EMI).Especially transformer station adopts after the protection and control system of layered distribution type; some secondary devices are directly transferred in transformer station's high-voltage switch gear field; because primary system trends towards high-voltage large-capacity operation; can produce stronger electromagnetic interference (EMI) to secondary circuit conversely; cause secondary device maloperation or device damage; and then have influence on the safe operation of electric system, power grid security is formed to serious threat.In The National Electric Power Communication Center; in chief editor " relay protection of power system Analysis on Typical Faults ", there are 215 accident cases; the protection incorrect operation wherein causing because of electrical secondary system problem has 92 times, accounts for 42%, and in fact secondary cable has formed the main hidden danger of substation safety operation.The transient electromagnetic field of the generations such as thunderbolt, switching manipulation, system short-circuit fault can produce interference voltage and electric current at the secondary device port of transferring by secondary cable, affects the normal work of secondary device when serious, even threatens the safe operation of whole system.And thunderbolt is as unique natural disturbance source, be characterized in that dash current is large, electric discharge immediate current peak value can reach tens～hundreds of kilo-ampere, and lightning current variable gradient is large, and whole discharge process can not exceed 60 μ s.Only have and fast, accurately identify the interference of secondary cable thunder and lightning, just can adopt an effective measure and control and eliminate the undesired signal in secondary device, to improve the antijamming capability of secondary device, meet the requirement of people to system security of operation, the quality of power supply and power supply reliability; Therefore when, optimum mode is for fault, excess power provides the research work of path Simultaneous Stabilization DC bus-bar voltage to seem of crucial importance.
Summary of the invention
The deficiency existing for prior art, a kind of transformer station of the utility model cable interference detecting apparatus that is struck by lightning, to reach fast, accurately to detect the object of disturbing letter type.
A kind of transformer station cable interference detecting apparatus that is struck by lightning, comprise bleeder circuit, voltage comparator, voltage retainer, A/D change-over circuit, host computer and computing machine, wherein, bleeder circuit output terminal connects input end and the A/D change-over circuit Yi road input end of voltage comparator, the output terminal of voltage comparator connects the input end of voltage retainer, the output terminal of voltage retainer connects another road input end of A/D change-over circuit, the output terminal of A/D change-over circuit connects the input end of host computer, and the output terminal of host computer connects the input end of computing machine.
Described bleeder circuit comprises the first resistance, the second resistance and voltage stabilizing diode, one end of the first described resistance is as the be struck by lightning input end of interference detecting apparatus of transformer station's cable, the other end of the first resistance connects one end, the negative electrode of voltage stabilizing diode and the input end of voltage comparator of the second resistance simultaneously, the other end of the second resistance connects the anode of diode, and ground connection.
The utility model advantage:
A kind of transformer station of the utility model cable interference detecting apparatus that is struck by lightning, for lightning impulse, transformer station's cable interference and other interference source are caused the identification of interference, propose a kind of H-S of utilization converter technique and extracted each band energy of interference voltage signal and value and characteristic of correspondence frequency thereof, with respect to extracted eigenwert with wavelet packet in the past, the effectively interference such as filtering noise of H-S conversion; Realized interference source type and conflicting mode are identified automatically by support vector machine, compared with neural network, required training sample is few, and the training time is short, does not have globally optimal solution problem, better astringency, thereby discrimination is higher; For the undesired signal of controlling and eliminate in secondary cable of adopting an effective measure in time provides foundation, avoid causing the secondary device maloperation or the device damage that are connected with cable.
Accompanying drawing explanation
Fig. 1 is the single unit system structured flowchart of a kind of embodiment of the utility model;
Fig. 2 is bleeder circuit, voltage comparator, voltage retainer and the A/D conversion circuit device circuit theory diagrams of a kind of embodiment of the utility model;
Fig. 3 is the standard lightning impulse corrugating figure of a kind of embodiment of the utility model;
Fig. 4 is the indirect lightning strike cable end piece heart yearn voltage time domain waveform figure of a kind of embodiment of the utility model;
When Fig. 5 is the thunderbolt voltage transformer (VT) voltage disturbance signal of a kind of embodiment of the utility model, cable end piece heart yearn voltage time domain waveform figure;
When Fig. 6 is the thunderbolt earth mat voltage disturbance signal of a kind of embodiment of the utility model, cable end piece voltage time domain waveform figure.
Embodiment
Below in conjunction with accompanying drawing, a kind of embodiment of the utility model is described further.
As depicted in figs. 1 and 2, a kind of transformer station cable interference detecting apparatus that is struck by lightning, comprise bleeder circuit, voltage comparator, voltage retainer, A/D change-over circuit, host computer and computing machine, in the utility model embodiment, A/D change-over circuit adopts the A/D modular converter on TOP2812DSP development board, and host computer adopts CCS3.3 software, described data collector comprises bleeder circuit 1, voltage comparator 2 and voltage retainer 3, bleeder circuit 1 output terminal connects the input end of voltage comparator 2 and the input end 31 of A/D change-over circuit, the output terminal of voltage comparator 2 connects the input end of voltage retainer 3, the output terminal of voltage retainer 3 connects the input end of A/D change-over circuit 4 interior feed circuit, in the utility model embodiment, give host computer by XDS100 emulator, this emulator one end is connected with the USB mouth of host computer, the other end is inserted on TOP2812 development board CPLDJTAG interface, the output terminal of host computer connects the input end of computing machine.
As shown in Figure 2, bleeder circuit 1 comprises a 1k Ω resistance, 10 Ω resistance and IN47273V0.5w type stabistor DW, one end of described 1k Ω resistance is as the be struck by lightning input end of interference detecting apparatus of transformer station's cable, the other end of 1k Ω resistance connects one end, the negative electrode of voltage stabilizing diode DW and the input end of voltage comparator of 10 Ω resistance simultaneously, the other end of 10 Ω resistance connects the anode of diode, and ground connection.Voltage comparator 2 and voltage retainer 3 inside all adopt amplifier.
In the utility model embodiment, as shown in Figure 3, for peak value is 400KV standard lightning impulse voltage waveform, wave head times 1.2 μ s, half peak time 50 μ s.When substation secondary voltage cable signal exceedes the U of 0.15 times
r(U
rvoltage on cable during for system stable operation) time, start the TOP2812 high-speed data acquisition equipment that is arranged on cable and secondary device connectivity port place, interference voltage signal on transformer station's cable line is carried out to sample record, and sample frequency is 10MHz, and sampling number is 600 points.Be labeled as h (t), the data that collect are delivered in host computer by XDS100 emulator.
Fig. 4～Fig. 6 is under disturbance mode, collects data time domain waveform.Lightning impulse is generally a unipolar pulse ripple, causes by thunderbolt the decaying wave that the interference voltage signal on cable is the higher-order of oscillation, and as can be seen from the figure, this installs the interference such as effective filtering noise.
Claims (2)
1. transformer station's cable interference detecting apparatus that is struck by lightning, it is characterized in that, comprise bleeder circuit, voltage comparator, voltage retainer, A/D change-over circuit, host computer and computing machine, wherein, bleeder circuit output terminal connects input end and the A/D change-over circuit Yi road input end of voltage comparator, the output terminal of voltage comparator connects the input end of voltage retainer, the output terminal of voltage retainer connects another road input end of A/D change-over circuit, the output terminal of A/D change-over circuit connects the input end of host computer, and the output terminal of host computer connects the input end of computing machine.
2. the transformer station according to claim 1 cable interference detecting apparatus that is struck by lightning, it is characterized in that, described bleeder circuit comprises the first resistance, the second resistance and voltage stabilizing diode, one end of the first described resistance is as the be struck by lightning input end of interference detecting apparatus of transformer station's cable, the other end of the first resistance connects one end, the negative electrode of voltage stabilizing diode and the input end of voltage comparator of the second resistance simultaneously, the other end of the second resistance connects the anode of diode, and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320728463.0U CN203688680U (en) | 2013-11-16 | 2013-11-16 | Apparatus for detecting lightning stroke interference of cables in transformer station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320728463.0U CN203688680U (en) | 2013-11-16 | 2013-11-16 | Apparatus for detecting lightning stroke interference of cables in transformer station |
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| Publication Number | Publication Date |
|---|---|
| CN203688680U true CN203688680U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320728463.0U Expired - Fee Related CN203688680U (en) | 2013-11-16 | 2013-11-16 | Apparatus for detecting lightning stroke interference of cables in transformer station |
Country Status (1)
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| CN (1) | CN203688680U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558484A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Substation cable lightning strike interference detecting device and method |
| CN106291177A (en) * | 2016-07-28 | 2017-01-04 | 国网河南省电力公司三门峡供电公司 | The electromagnetic disturbance of intelligent substation assembly and communication equipment is analyzed method by Intruding wave |
-
2013
- 2013-11-16 CN CN201320728463.0U patent/CN203688680U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558484A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Substation cable lightning strike interference detecting device and method |
| CN106291177A (en) * | 2016-07-28 | 2017-01-04 | 国网河南省电力公司三门峡供电公司 | The electromagnetic disturbance of intelligent substation assembly and communication equipment is analyzed method by Intruding wave |
| CN106291177B (en) * | 2016-07-28 | 2019-04-23 | 国网河南省电力公司三门峡供电公司 | Electromagnetic disturbance analysis method of the Intruding wave to intelligent substation component and communication equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20151116 |
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| EXPY | Termination of patent right or utility model |