CN203326585U - Coal mine high-voltage grid selective earth leakage protection device - Google Patents
Coal mine high-voltage grid selective earth leakage protection device Download PDFInfo
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- CN203326585U CN203326585U CN2013203818357U CN201320381835U CN203326585U CN 203326585 U CN203326585 U CN 203326585U CN 2013203818357 U CN2013203818357 U CN 2013203818357U CN 201320381835 U CN201320381835 U CN 201320381835U CN 203326585 U CN203326585 U CN 203326585U
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Abstract
The utility model discloses a coal mine high-voltage grid selective earth leakage protection device which comprises a signal acquisition device used for acquiring zero-sequence voltage signals and zero-sequence current signals, a control cabinet used for receiving and processing the acquired signals and calculating decaying DC component of zero-sequence current in each branch so as to judge fault branch, a LCD used for displaying leakage fault and a keyboard capable of closing and resetting each branch, wherein the signal acquisition device, the control cabinet, the LCD and the keyboard are connected in order. By the utilization of the coal mine high-voltage grid selective earth leakage protection device, line selection is accurate when a high-voltage leakage single-phase earth fault happens, a fault line can be cut off reliably and effectively so as to prevent from further expanding the fault, and grounding line number and connection incoming line name can be displayed.
Description
Technical field
The relevant a kind of earth leakage protective device of the utility model, refer to a kind of colliery Underground High-Voltage Power Network selective leakage protection device especially.
Background technology
At present, China's mine high pressure 6kV-10kV electrical network is taked the operational mode of neutral point through arc suppression coil or arc suppression coil high resistant.When the single-phase earthing fault occurs when, can the compensation network single-phase-to-ground current due to arc suppression coil, make the leak current fault electric current very little, but now electric power system still can guarantee the symmetry of line voltage, can not have influence on the continuous power supply to load, therefore needn't trip immediately.As shown in Figure 1, through the Coal Mine Power Distribution System model of grounding through arc, the arc suppression coil in some colliery drops into always, and K switch is in normally off; Some is to be operated in normally open, drops into arc suppression coil after the system of judging breaks down again, and makes the K switch closure.Under normal circumstances, if think relatively parameter symmetry of electrical network three, transformer neutral point does not have residual voltage, there is no zero-sequence current on arc suppression coil.After certain branch road generation single phase ground fault, the relation of three-phase symmetrical is broken, and makes transformer neutral point residual voltage occur, and zero-sequence current appears in coil L and each branch road.
But along with developing rapidly of colliery power distribution network electric power system, make electric capacity and current with single-phase earthing in system increase, single-phase-to-ground current surpasses 20A person to be accounted for more than 80%, long-play easily makes fault be expanded into or multipoint earthing short circuit at 2, the arc grounding simultaneously caused also can cause the total system overvoltage, and then damage equipment, the safety of service cable in serious threat, also likely cause gas, coal-dust explosion simultaneously, mine and workman's safety in serious threat, so must find in time faulty line and be excised.According to standing order: must tool for mounting on the central substation high-tension main under coal mine ground electric substation and coal mine one-phase ground protection device selectively; For on the high-tension main of mobile substation, must be equiped with the one-phase ground protection device optionally moved in tripping operation.
The line selection apparatus of existing high pressure electric leakage in the market, a part of device is to adopt the stable state information after fault to carry out route selection, some device or even the protection philosophy based on zero-sequence current protection or zero sequence power direction.In most of coal mining enterprises; the high-voltage fence neutral point is through arc suppression coil or arc suppression coil grounding through resistance; fault message is not obvious; make the device based on principles such as above-mentioned stable state information or zero-sequence current protections ineffective; a lot of Useful Informations when these devices can lose fault; therefore these device ubiquity route selection accuracy are low, and erroneous judgement is misjudgement even, and seldom can reach the purpose of correct route selection.
The utility model content
In view of this, utilize the transient selection method when main purpose of the present utility model is to provide a kind of breaking down, can be reliably effective disengagement failure circuit, prevent from further enlarging the colliery Underground High-Voltage Power Network selective leakage protection device of fault.
For achieving the above object; the utility model provides a kind of colliery Underground High-Voltage Power Network selective leakage protection device, its include successively connect for the signal pickup assembly that gathers residual voltage signal and zero sequence current signal, receive the signal gathered the attenuating dc component of being processed and calculated zero-sequence current in the size of each branch road with the control cabinet of failure judgement branch road, in order to the liquid crystal display that shows leak current fault and the keyboard that can be closed and reset each branch road.
Described signal pickup assembly include zero sequence current mutual inductor for extracting zero sequence current signal with for extracting the voltage transformer of residual voltage signal.
Described signal pickup assembly gathers the signal of 2 buses and 28 branch roads simultaneously.
Described control cabinet includes the information fast processing to collection connected successively and calculates the FPGA unit of the attenuating dc component of zero-sequence current in each branch road size, the analysis of complete paired data according to the obvious attenuating dc component of zero-sequence current in faulty line, and the very little principle of the attenuating dc component that perfects the circuit zero-sequence current is judged the arm processor of fault branch and receive the control trip signal that this arm processor sends the relay output unit of exporting trip signal, described signal pickup assembly is directly sent the residual voltage and the zero-sequence current that sample into this FPGA unit, carry out communication by the RS-485 bus between this arm processor and described liquid crystal display.
Described keyboard carries out communication by PS-II bus and described liquid crystal display.
Utilize the utility model, when high pressure electric leakage single phase ground fault occurs when route selection accurate, can be reliably effective disengagement failure circuit, prevent from further enlarging fault, and can show ground path numbering and contact inlet wire title.
The accompanying drawing explanation
Fig. 1 is the Coal Mine Power Distribution System model of prior art through grounding through arc;
Fig. 2 is zero sequence circuit coordinate diagram when in the utility model, break down in glitch linea angulata road;
The structure principle chart that Fig. 3 is the utility model colliery Underground High-Voltage Power Network selective leakage protection device;
Fig. 4 is the flowing through channel schematic diagram of DC component in inductance when in the utility model, single phase ground fault occurs interconnection line2-7;
Fig. 5 is the flowing through channel schematic diagram of DC component in inductance when in the utility model, single phase ground fault occurs branch road line2-6;
Fig. 6 is the schematic flow sheet that the utility model carries out failure line selection and faulty line is tripped.
Embodiment
For ease of structure of the present utility model and the effect that reaches are had to further understanding, the existing preferred embodiment that develops simultaneously by reference to the accompanying drawings is described in detail as follows.
When low current grounding occurs, in fault message, transient state component and harmonic current enrich very much, far away higher than the steady-state component after fault, so take full advantage of transient, can expand route selection information, improve route selection reliability and validity scope.Especially for some unsettled intermittent defects, the power frequency amount is very little, and non-power frequency composition is relatively abundant, utilizes the transient selection method more to have superiority.Simultaneously arc suppression coil works hardly to the transient state composition, so the transient selection method is not subject to the impact of neutral grounding mode substantially, is suitable for using in the high-pressure leakage protection device of mine.
Fully analyzing on the basis of current document and device, through a large amount of emulation and on-the-spot test failure information, the utility model proposes a kind of high-voltage fence selective leakage protection device based on the attenuating dc component method.When arbitrary circuit generation leak current fault, in faulty line, zero-sequence current has obvious attenuating dc component, but not the attenuating dc component of the zero-sequence current contained in fault branch is very little, and decaying dc only flows through fault branch and arc suppression coil, and do not flow through non-fault branch.According to this characteristic, can accurately select faulty line, reach optionally purpose.
During the distribution network generation single phase ground fault of coalmine high-voltage power network neutral by arc extinction coil grounding, the characteristic of attenuating dc component can be as shown in Figure 2, when arbitrary circuit generation single phase ground fault, in faulty line, zero-sequence current has obvious attenuating dc component, and it is very little to perfect the attenuating dc component of circuit zero-sequence current; When bus generation single phase ground fault, in each circuit, the attenuating dc component of zero-sequence current is almost nil.
Zero sequence current mutual inductor and voltage transformer are installed in high voltage flameproof switch, therefore can extract zero sequence current signal by zero sequence current mutual inductor, open-delta by voltage transformer is extracted residual voltage, and the zero-sequence current and the residual voltage signal that extract are sent in high pressure electric leakage line selection apparatus by the toy trumpet mouth.
As shown in Figure 3, colliery of the present utility model Underground High-Voltage Power Network selective leakage protection device includes the signal pickup assembly 1 connected successively, control cabinet 2, liquid crystal display 3 and keyboard 4, this signal pickup assembly 1 gathers zero sequence current signal and residual voltage signal, this signal pickup assembly 1 is connected with control cabinet 2, this signal pickup assembly 1 is delivered to control cabinet 2 by the residual voltage of collection and zero-sequence current, the size of the attenuating dc component of zero-sequence current at each branch road processed and calculated to the signal of 2 pairs of collections of this control cabinet, and judge fault branch, and show leak current fault on liquid crystal display 3 simultaneously.
Signal pickup assembly 1 in the utility model includes zero sequence current mutual inductor and voltage transformer, be respectively used to extract zero sequence current signal and residual voltage signal, signal pickup assembly 1 adopts concentrated mode, can gather the signal of 2 buses and 28 branch roads simultaneously, meet the demand of actual conditions fully.Control cabinet 2 in the utility model includes FPGA (Field Programmable Gate Array, field programmable gate array) unit 20, the arm processor 21 and relay output unit 22 connected successively.Signal pickup assembly 1 is directly sent the residual voltage and the zero-sequence current that sample into FPGA unit 20, between arm processor 21 and liquid crystal display 3, by the RS-485 bus, carries out communication, and relay output unit 22 is directly exported trip signal.
FPGA of the present utility model unit 20 completes fast processing and the calculating of Information Monitoring, calculate the size of the attenuating dc component of zero-sequence current at each branch road, analysis and the judgement of arm processor 21 complete paired datas, according to zero-sequence current in faulty line, obvious attenuating dc component is arranged, and the very little principle of the attenuating dc component that perfects the circuit zero-sequence current, judge fault branch, and show leak current fault on liquid crystal display 3; The control trip signal that relay output unit reception arm processor 21 sends is also exported trip signal.
Keyboard 4 carries out communication by PS-II bus and liquid crystal display 3, but also can be closed and reset each branch road by keyboard 4 setup parameters, forms the system configuration of layered distribution type, facilitates the field personnel to operate.
The computational methods of attenuating dc component in the utility model:
Because Orthogonal Wavelet Packet has the characteristic of multiresolution analysis, can pass through its decomposition and reconstruction algorithm, original sampled signal is carried out to the Orthogonal Wavelet Packet decomposition, can obtain the information in the different frequency section.If sample frequency is f
sDiscrete signal after the decomposition of the j number of plies, its frequency range is divided into
Low frequency and
High frequency.The signal that sampling db10 wavelet packet is 4000Hz to sample frequency is decomposed, as known from the above, when decomposition scale is j=6, the frequency information that signal under this yardstick comprises is 0～31.25Hz, grounding system for neutral point through arc suppression coil, the information of this frequency band is exactly the frequency band at attenuating dc component place.
For the calculating of attenuating dc component, can adopt recursive algorithm to be calculated.
Suppose that sampled signal has following form:
In formula (1), I
DCFor the attenuating dc component initial value; τ is damping time constant; I
m(n) and
Amplitude and initial phase angle for nth harmonic.After discrete, obtain as shown in the formula (2):
In formula (2), Δ T is the sampling interval, the sampling number that N is per cycle.If
Calculate x (k) can obtain with value in one-period
The value of N+1 sampled point, calculate
In like manner can obtain,
By (2) and (3), can be obtained:
The initial value of attenuation components is:
Damping time constant τ,
In sum, can obtain attenuating dc component
In the utility model during arc suppression coil earthing system generation single phase ground fault, the attenuating dc component the produced faulty line of only flowing through, and the non-fault line of not flowing through utilizes this characteristic to carry out failure line selection.
As shown in Figure 4, when single phase ground fault occurs in the interconnector line2-7 of the 2# of electric substation, the upper attenuating dc component produced of arc suppression coil L can flow through the interconnector line2 of transformer 6000v outlet line0, the 1# of electric substation and the interconnector line2-7 of the 2# of electric substation; And the attenuating dc component that all circuits of the 3# of electric substation do not have on arc suppression coil flows through, be only that the capacity current of this circuit flows through.
In actual motion, the protective device that place at the 1# of electric substation and the 2# of electric substation place can record in this electric substation has higher decaying dc on interconnection (line2 and line2-7), according to the time of adjusting, carry out time delay, and the time delay of the 1# of electric substation is higher than the delay time of the 2# of electric substation setting; And the 3# of electric substation is hardly containing decaying dc, so the 3# of electric substation can not carry out tripping operation, thus the 2# of electric substation time delay arrive after fault still exist, now the 2# of electric substation will carry out trip operation to line2-7.
As shown in Figure 5, when single phase ground fault occurs in the terminated line line2-6 of the 2# of electric substation, the upper attenuating dc component produced of arc suppression coil L can flow through the interconnector line2 of transformer 6000v outlet line0, the 1# of electric substation and the circuit line2-6 of the 2# of electric substation; And the attenuating dc component that all circuits of the 3# of electric substation do not have on arc suppression coil flows through, be only that the capacity current of this circuit flows through.
In actual motion, the 1# of electric substation and the 2# of electric substation can record respectively on interconnection line2 and line2-6 very high decaying dc, but the 1# of electric substation can carry out time delay according to the time of adjusting in advance, and the 2# of electric substation can be that line2-6 carries out trip operation to the terminated line that single-phase earthing occurs.
In the utility model, the entry condition of route selection criterion is that residual voltage surpasses the residual voltage setting value; after meeting entry condition; calculating according to protective device to all circuit DC component of this electric substation; in conjunction with the processing mode of fault of interconnected transmission line and two kinds of situations of terminated line fault, carry out corresponding time delay or tripping operation.As shown in Figure 6, the schematic flow sheet that the utility model carries out failure line selection and faulty line is tripped.
Technical parameter in the utility model:
(1) bus is 2 sections, 28 of total branch roads;
(2) system earth capacitance current 100mA-400A;
(3) residual voltage startup value 15V-120V;
(4) fault resolution 30ms;
(5) trip time 0.1s-99.9s (setting arbitrarily);
(6) device operating voltage AC127V power supply, supply current 5A;
(7) accuracy of detection: 0.1%;
(8) tripping operation time delay: 0-0.5s (can set);
(9) tripping operation egress capacity: AC220V, 8A, time constant is 5ms;
(10) communication modes: interface protocol RS485 and conventional Modbus agreement;
(11) ambient temperature :-10 ℃-+60 ℃, humidity 85%.
The beneficial effect that the utility model reaches:
(1) selectivity function: when high pressure electric leakage single phase ground fault occurs when route selection accurate, and can show ground path numbering (title) and contact inlet wire title;
(2) ground connection memory: can remember the ground connection information of nearly one month, the ground connection packets of information is containing each route selection structure, and down time, fault data, ground connection beginning and ending time etc., after power supply loses power supply, information is not lost;
(3) ground signalling output: output ground signalling when the high pressure electric leakage occurs;
(4) signal resets: hand-reset on the spot, by reset key, can realize signal return;
(5) function is set: the major parameter manually arranged, as bus number and title, number and title, appearance numbering, starting resistor etc. occur.
The above, be only preferred embodiment of the present utility model, is not intended to limit protection range of the present utility model.
Claims (5)
1. a colliery Underground High-Voltage Power Network selective leakage protection device; it is characterized in that, its include successively connect for the signal pickup assembly that gathers residual voltage signal and zero sequence current signal, receive the signal gathered the attenuating dc component of being processed and calculated zero-sequence current in the size of each branch road with the control cabinet of failure judgement branch road, in order to the liquid crystal display that shows leak current fault and the keyboard that can be closed and reset each branch road.
2. colliery as claimed in claim 1 Underground High-Voltage Power Network selective leakage protection device; it is characterized in that, described signal pickup assembly include zero sequence current mutual inductor for extracting zero sequence current signal with for extracting the voltage transformer of residual voltage signal.
3. colliery as claimed in claim 2 Underground High-Voltage Power Network selective leakage protection device, is characterized in that, described signal pickup assembly gathers the signal of 2 buses and 28 branch roads simultaneously.
4. colliery as claimed in claim 1 Underground High-Voltage Power Network selective leakage protection device, it is characterized in that, described control cabinet includes the information fast processing to collection connected successively and calculates the FPGA unit of the attenuating dc component of zero-sequence current in each branch road size, the analysis of complete paired data according to the obvious attenuating dc component of zero-sequence current in faulty line, and the very little principle of the attenuating dc component that perfects the circuit zero-sequence current is judged the arm processor of fault branch and receive the control trip signal that this arm processor sends the relay output unit of exporting trip signal, described signal pickup assembly is directly sent the residual voltage and the zero-sequence current that sample into this FPGA unit, carry out communication by the RS-485 bus between this arm processor and described liquid crystal display.
5. colliery as claimed in claim 1 Underground High-Voltage Power Network selective leakage protection device, is characterized in that, described keyboard carries out communication by PS-II bus and described liquid crystal display.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203818357U CN203326585U (en) | 2013-07-01 | 2013-07-01 | Coal mine high-voltage grid selective earth leakage protection device |
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| CN2013203818357U CN203326585U (en) | 2013-07-01 | 2013-07-01 | Coal mine high-voltage grid selective earth leakage protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941615A (en) * | 2014-02-24 | 2014-07-23 | 国家电网公司 | Microcontroller controlling method used for wind-power-plant ultrasonic wind speed monitoring |
| CN114089088A (en) * | 2020-07-15 | 2022-02-25 | 北京天阳睿博科技有限公司 | Whole coal mine grid high-voltage electric leakage monitoring system based on wams and Internet of things technology |
-
2013
- 2013-07-01 CN CN2013203818357U patent/CN203326585U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941615A (en) * | 2014-02-24 | 2014-07-23 | 国家电网公司 | Microcontroller controlling method used for wind-power-plant ultrasonic wind speed monitoring |
| CN114089088A (en) * | 2020-07-15 | 2022-02-25 | 北京天阳睿博科技有限公司 | Whole coal mine grid high-voltage electric leakage monitoring system based on wams and Internet of things technology |
| CN114089088B (en) * | 2020-07-15 | 2024-05-10 | 北京天阳睿博科技有限公司 | Full electric network high voltage electric leakage monitored control system in colliery based on wams and internet of things |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20140701 |
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| EXPY | Termination of patent right or utility model |