CN1141768C - Digital travelling wave protection method for power transmission line and its relay and protection system - Google Patents
Digital travelling wave protection method for power transmission line and its relay and protection system Download PDFInfo
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Abstract
The present invention relates to a transmission line digital traveling wave protection method, a relay and a protection system thereof, which belongs to the electric power system field. The present invention comprises a digital traveling wave relay and a high-frequency carrier communication part, wherein the digital traveling wave relay comprises corresponding hardware circuits, a traveling wave directional relay principle, a protection action principle and a wavelet transform algorithm, and the traveling wave directional relay principle, the protection action principle and the wavelet transform algorithm are solidified in the hardware circuits; the high-frequency carrier communication part comprises a high-frequency transceiver and a high-frequency carrier channel-transmission line. In the present invention, the action results of traveling wave directional relays on both ends of a transmission line are compared for judging whether a fault happens on the line, and thus, the decision that whether relay protection is actuated to have a tripping operation is made. The protection has rapid action performance, the action time of directional relays is less than 5 ms, the protection action time is less than 15 ms, and the protection is irrelevant to the transition resistance and the saturation situation of a current transformer and is not influenced by electric power system oscillation.
Description
Technical field
The invention belongs to field of power, particularly the Protection Technology of electric power system high pressure/extra high voltage network.
Background technology
Relaying protection is the important component part of electric power system.Responsiveness is to weigh the important indicator of relaying protection performance quality.The present relaying protections that move in a large number in electric power system are basically all based on the power frequency electric parameters.This relaying protection is when adopting microcomputer to realize, its operate time is generally all more than 20 milliseconds, and especially, owing to be subjected to factor affecting such as transition resistance, current transformer are saturated, the sensitivity of relaying protection and responsiveness all are subjected to bigger restriction.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art; a kind of digital travelling wave protection method for power transmission line and relay thereof and protection system are proposed; use High speed data acquisition, fast digital signal processing technology, utilize the transient state travelling wave and the wavelet transformation technique that are produced behind the transmission line malfunction, can write down capable ripple of circuit two ends three-phase transient voltage and three-phase transient current travelling waves behind the transmission line malfunction.Can be as the high pressure and the extra high voltage network main protection of 110 kilovolts and above electric pressure.Advantage with ultrahigh speed performance (fast motion speed can reach several millisecond).
A kind of digital travelling wave protection method for power transmission line that the present invention proposes is characterized in that, may further comprise the steps:
(1) transient voltage and the transient current travelling waves that is produced after collection and the computing electric power line fault;
(2) three-phase voltage and the popular ripple of three-phase electricity that obtain are at first implemented phase-model transformation, obtain two line mold components;
(3) implement wavelet transformation for these two line line wave components, obtain the wavelet transformation modulus maximum;
(4) ratio of calculating initial voltage capable ripple wavelet transformation modulus maximum and the capable ripple wavelet transformation of initial current modulus maximum is differentiated the direction that fault takes place, and its criterion is:
If ratio then is judged to the forward fault less than bearing 1;
If it is positive 1 that ratio equals, then be judged to reverse fault;
(5) utilize the fault direction information at radio frequency carrier channel exchange protected circuit two ends, and then do to be out of order according to the direction of both ends discrimination result and occur in the protected circuit district or the outer conclusion in district, whether the decision relaying protection exports would trip;
Its protection operating criterion is:
Being the forward fault if the direction of both ends relay is all differentiated, then is internal fault, protection outlet would trip;
If the direction of both ends relay is differentiated difference as a result, then be judged to external fault, protection is failure to actuate.
The present invention proposes a kind of digital travelling wave relay that adopts above-mentioned guard method; it is characterized in that: comprise be installed in insert in the cabinet on the motherboard by power supply; current/voltage; voltage/voltage changer plate; monitor board; the directional relay plate; the traveling-wave protection plate; the hardware unit that six parts of exit relay plate are formed, and be solidificated in monitor board; the directional relay plate; monitoring module in three microprocessors on the traveling-wave protection plate; the phase-model transformation module; the wavelet transformation module; the row ripple starts module; the row ripple selects phase module; complete wave impedance directional relay module; protection and algorithm routine that protection action discrimination module is formed.This protection and algorithm routine are worked out by above-mentioned traveling-wave protection method, and its effect has two: gather and calculate the row ripple, differentiate fault direction; Relatively direction of both ends is differentiated the result.
The present invention proposes a kind of transmission line digital travelling wave protection system that adopts above-mentioned digital travelling wave relay, it is characterized in that: the end at transmission line to be protected is connected with first digital travelling wave relay and first coupled high frequency machine for receiving and emitting message, is connected with second digital travelling wave relay and second coupled high frequency transmitting-receiving news at the other end of this transmission line; Wherein, high frequency machine for receiving and emitting message and radio frequency carrier channel are used to exchange the fault direction differentiation result at protected transmission line two ends.If the fault direction of circuit two ends travelling wave relay is differentiated the result all for just, think that then fault occurs in the protected circuit district, relay outlet tripping operation, otherwise relay is failure to actuate.
The present invention can reach following performance index:
1, goes the ripple directional relay outlet time less than 5 milliseconds;
2, a whole set of operate time of protection is less than 15 milliseconds;
3, can write down capable ripple of circuit two ends three-phase transient voltage and three-phase transient current travelling waves behind the transmission line malfunction.
The present invention can be applied to protect high pressure, the extra high voltage network of 110 kilovolts and above electric pressure.
Description of drawings
Fig. 1 is applied to typical transmission line embodiment protection system pie graph for the present invention.
Fig. 2 is the digital travelling wave relay structured flowchart in the present embodiment.
Fig. 3 is the monitor board hardware structure diagram in the present embodiment.
Fig. 4 is that the software of the monitor board in the present embodiment constitutes block diagram.
Fig. 5 is the directional relay plate hardware structure diagram in the present embodiment.
Fig. 6 is that the software of the directional relay plate in the present embodiment constitutes block diagram.
Fig. 7 is the hardware structure diagram of the traveling-wave protection plate of present embodiment.
Fig. 8 is that the software of the traveling-wave protection plate of present embodiment constitutes block diagram.
Embodiment
The present invention proposes digital travelling wave protection method for power transmission line and relay thereof and protection system embodiment, be described in detail as follows in conjunction with each accompanying drawing:
The said transmission line digital travelling wave protection of the present invention system embodiment is to be used for a typical transmission line; as shown in Figure 1; wherein the power system device of typical transmission line comprises: transmission line 1, equivalent electric power system 2, bus 3, voltage transformer 4, current transformer 5, high-frequency coupling equipment 6, high-frequency coupling equipment 11; line trap 7, circuit breaker 8.
The effect of each components and parts of power system device is respectively described below among Fig. 1:
(1) transmission line 1 is protected transmission line, also is the passage that transmits high-frequency carrier signal.
(2) equivalent electric power system 2, representative is connected to the electric power system at these circuit two ends.
(3) substation bus bar at bus 3 these circuit two ends of expression.
(4) voltage transformer 4, are used for high voltage is for conversion into low-voltage 100 volts.
(5) current transformer 5, and being used for becomes little electric current to the big current transformation that flows through on the circuit, 1 ampere.
(6) high-frequency coupling equipment 6, are used for that high-frequency carrier signal is coupled to transmission line and get on, and also are used for fetching the high-frequency carrier signal that send the opposite end from transmission line.
(7) trap 16,17, are used to allow high-frequency signal flow on this circuit and get on less than other circuit.
(8) circuit breaker 18,19, are used for closed and the excision transmission line.
In this typical transmission line, two high frequency machine for receiving and emitting message and two digital travelling wave relays of being arranged on protected transmission line 1 two ends have been formed this digital travelling wave protection system embodiment, wherein, the high frequency machine for receiving and emitting message is used for producing transmission and receives high-frequency signal; Digital travelling wave relay is realized relaying protection.This two-part example structure and function are described in detail as follows respectively:
1. be applied to the digital travelling wave relay in this digital travelling wave protection system embodiment; it forms structure embodiment as shown in Figure 2, and it comprises power panel 21, current/voltage, voltage/voltage changer plate 22, monitor board 23; directional relay plate 24; traveling-wave protection plate 25, exit relay plate 26, these six blocks of plates all are inserted on the motherboard 27; this motherboard 27 is installed in the cabinet 28; on these cabinet 28 panels and the side plate LCD 281 is installed, button 282, supply socket 283 etc.
Its course of work is: power panel 21 provides power supply for other plug-in unit; the three-phase voltage that comes from voltage transformer; the three-phase current that comes from current transformer inserts voltage/voltage respectively; current/voltage converter plate 22; then by 24 samplings of directional relay plate; computing; obtain fault direction (just or negative); give traveling-wave protection plate 25 then; this plate sends this result to the high frequency machine for receiving and emitting message on the one hand; wait for the opposite end discriminating direction result that the high frequency machine for receiving and emitting message is received on the one hand; if all for just; then traveling-wave protection plate output trip signal is given relay exit plate 26; through this plank outlet tripping operation, circuit breaker action excision faulty line.Monitor board 23 links to each other with directional relay plate 24, traveling-wave protection plate 25, monitors the control whole system operation, and above-mentioned 6 plug-in units are installed on the motherboard 27, are encapsulated in 28 li of cabinets.LCD Panel 281 is housed on the front panel of cabinet outside, is used for the display operation situation and shows fault message; button 282 is used for input revises relay protection constant value, carries out display operation, and AC Power supply socket 283 offers this relay and exchanges or DC power supply for 220 volts.
The model and the function declaration of each device are as follows:
(1) power panel 21: the YF20-113 power supply that it is produced by the Wuxi is welded on the printed circuit board and constitutes.
Provide each plank of travelling wave relay employed power supply, 250 watts of power, electric pressure is: positive and negative 5 volts, give power supply is provided for positive and negative 12 volts.
(2) voltage/voltage, current/voltage converter plate 22 it be SCT-254 mainly the current/voltage converter constitutes by 8 models voltage/voltage changer that is SPT-264A and 8 models.
The effect of this plank is that the current transformation of 100 volts of voltage and currents 1 (or 5) ampere that comes from voltage current transformer is become positive and negative 5 volts voltage signal, uses for single chip circuit.
8 voltage/voltage changers and 8 current/voltage converters are installed on this plank.
(3) monitor board 23
The effect of this plank is the work of management, the whole digital travelling wave relay of commander.Comprise and refresh LCD screen, demonstration fault waveform, keyboard scan operation and traveling-wave protection board communications (comprising mutual inspection and read failure data) etc.The hardware that it mainly is made of MC68332 microprocessor and correspondent peripheral circuit, and the software program that is stored in is wherein formed.
The main components and parts of these monitor board 23 hardware are as follows as shown in Figure 3:
Microprocessor: 32 bit processor chip MC68332, this processor is the core parts of this monitor board, all functions of this plate all will realize by this chip and the program that operates in wherein.
Data storage RAM:62256 (256K byte) is used for store data
Program storage EPROM:27256 (256K byte) is used to deposit and program curing RAM, 62256
These monitor board 23 software programs are solidificated among the program storage EPROM (62256), operate in the MC68332 microprocessor, mainly finish following function:
With directional relay plate 24, the communication between the traveling-wave protection plate 25;
Keyboard operation;
Liquid crystal display;
Fault data storage etc.
This program is made of two parts, and one is normal operation (main program), shown in Fig. 4 a; Another is the back (exception handles) of breaking down.Shown in Fig. 4 b.Now be respectively described below in conjunction with the accompanying drawings:
Main program comprises:
" startup initialization " module: start DSP, power on, set the state of each pin, open interruption.
" self check " module: the data storage self check, the data storage area not having to use writes byte, reads again, checks its state.
" liquid crystal display " module:
During normal the operation, show " RUN " on LCD screen, refresh once 1 second;
After breaking down, show on LCD screen " fault " that refresh once 2 seconds;
When keyboard operation, show corresponding dialogue character and waveform, definite value etc.
" keyboard scan operation " module is used for keyboard scan, and 1 second once; If there is definite value to transfer requirement, waveform calls requirement etc., realizes by this module
" trigger differentiate " module: differentiate whether fault initiating of hardware, triggered and then changed exception handles over to; Otherwise circular wait.It has limit priority.Fault changes exception handles over to after taking place immediately.The meaning of " waiting for for 1 second " is to occur to the time that can obtain this result of the action and fault data from fault.
Exception handles comprises " with the traveling-wave protection board communications, the read failure data " module and " forming this fault data file " module.
Wherein: " with the traveling-wave protection board communications, the read failure data " module is used for reading three-phase voltage, the three-phase current waveform of this fault through serial port and traveling-wave protection board communications.The result of protection action.
The module that " forms this fault data file " together with temporal information etc., is organized into reference format for this fault data, prepares to call to the operations staff, shows, checks.
(4) the directional relay plate 24
The effect of this plank be gather and record trouble after transient current, transient voltage, execution mutually-modular transformation, wavelet transformation, fault initiating is differentiated, fault is selected phase, fault direction calculates and differentiation.
These directional relay plate 24 hardware constitute as shown in Figure 5, and it is made up of analog signal input and A/D modular converter (frame of broken lines left part), digital signal processing module (part in the frame of broken lines), communication module (frame of broken lines right side part) three parts.
The composition and the function declaration of each module are as follows:
Input of ← analog signal and A/D modular converter
Comprise preposition low pass circuit, preposition band-pass circuit, A/D module, comparator (hardware-initiated) circuit.Wherein:
Preposition low pass circuit
Adopt the low-pass filter circuit of one 200 KHz, the filtering High-frequency Interference.
Preposition band-pass circuit
Be used for the fault initiating circuit, frequency range 3 KHz ~ 10 KHz.
Comparator (hardware-initiated) circuit, working voltage comparator LM293 constitutes
Three-phase current will obtain the frequency component of 3 KHz ~ 10 KHz through behind the preposition band-pass circuit.
The threshold of this power frequency component and setting is compared, if be output as high level, then from hardware point of view, fault is " generation ".
The A/D module
The core of A/D module is the A/D converter chip, and this chip is chosen as AD803.
↑ Digital Signal Processing (being called for short DSP) module comprises control and decoding circuit, dsp chip and correspondent peripheral circuit.Wherein:
Control and decoding circuit
Be mainly used in control analog-to-digital conversion (A/D), give RAM transformation result;
DSP and peripheral circuit
Dsp chip is selected TMS320C31, and peripheral chip comprises data storage RAM, program storage chip EPROM62256.
→ communication module
Adopt the MC485 chip, be used for gathering and result of calculation with other plate or background computer exchange.
The software program of this directional relay plate 24 as shown in Figure 6, it is solidificated among the program storage EPROM62256 in DSP and the peripheral circuit, operates among the DSP, this program is finished following function:
The software of fault initiating is differentiated;
Phase-model transformation;
Wavelet transformation;
Fault is selected phase;
Fault direction is differentiated.
Now be described as follows in conjunction with Fig. 6
Start module: start DSP, power on.
Initialization module: set the state of each pin, open interruption.
Self check: data storage self check
Trigger to differentiate: differentiate whether fault initiating of hardware, triggered then and continued; Otherwise circular wait.
Reading of data: read in fault data.
Software is declared startup: a certain phase in the three-phase current or all whether sue for peace greater than setting value.Yes, think that fault takes place, and continues, otherwise returns.
The phase-model transformation module: three-phase current Ua, Ub, Uc, three-phase voltage Ia, Ib, Ic are transformed into modulus voltage and modulus electric current U α, U β, U0, I α, I β, I0.
The wavelet transformation module
Adopt dyadic wavelet, transformation for mula is as follows
{ hi}i ∈ Z is with { gi}i ∈ Z is a wavelet conversion coefficient, and numerical value is { hk}=(0.125,0.375,0.375,0.125) (k=-1,0,1,2); { gk}=(2,2) (k=0,1) .A
2 ' dF (n) is that wavelet transformation approaches component
W
2 ' dF (n) is a Wavelet Component
F (n) is that the voltage or electric current (sampled value) fault that disperse are selected phase module
Select fault suitable according to the wavelet transformation result | Io|=0,
If | I α |=2|I β |=2|I γ |, be judged to the AB line to line fault;
If | I β |=2|I α |=2|I γ |,, be judged to the AC line to line fault;
If | I γ |=2|I β |=2|I α |,, be judged to the BC line to line fault.
Otherwise, be judged to three-phase shortcircuit and work as | Io| ≠ 0,
If | Io|=|I α |=| I β |, be judged to A phase ground connection;
If | Io|=|I α |=| I γ |, be judged to B phase ground connection
If | Io|=|I β |=| I γ |, be judged to C phase ground connection;
If Io=I is β+I γ, be judged to AB phase ground connection;
If Io=I is α-I γ, be judged to AC phase ground connection;
If Io=-(I β+I α) is judged to BC join Io, I α in the ground type, I β, I γ, all is the modulus electric current behind the wavelet transformation.Wherein
Iγ＝Ib-Ic
The discriminating direction module
Differentiate fault and occur in positive direction or opposite direction
If the wavelet transformation modulus maximum of the wavelet transformation modulus maximum of modulus voltage and electric current is divided by again divided by constant (surge impedance of a line), if the result then is judged to the forward fault less than bearing 1; If equal 1, then be judged to reverse fault.
Communication module
By serial communication this result is sent to the traveling-wave protection plate.
(5) the traveling-wave protection plate 25
The effect of traveling-wave protection plate is to carry out the relaying protection criterion, and whether failure judgement occurs in protected circuit inside.Specifically comprise: serial communication; The execute protection criterion; Control the machine for receiving and emitting message transmission or stop to send high-frequency signal; From directional relay plate read failure data; Fault data is sent to MC68332 microprocessor unit on the monitor board.
The hardware of traveling-wave protection plate 25 constitutes as shown in Figure 7, and this plank mainly is made of 32-bit microprocessor MC68332 and the correspondent peripheral circuit that Motorola produces.
Microprocessor adopts 32 bit processor chip MC68332; 8251 as serial expansion mouthful, expands two serial ports, be used for and monitor board and directional relay plate between communication.This processor is the core parts of this plank, and all functions of this plank all will realize by this chip and the program that operates in wherein.
Data storage RAM:62256 (256K byte) is used for store data.
Program storage EPROM:27256 (256K byte) is used to deposit and program curing.
The software of traveling-wave protection plate 25 is to be solidificated in program storage and to operate in program among the MC68332, executive communication function, execute protection criterion, functions such as machine for receiving and emitting message control.The program of traveling-wave protection plate as shown in Figure 8.Now be described as follows in conjunction with this figure:
Start module---start DSP, power on.
Initialization module---set the state of each pin, open interruption.
Self check---data storage self check.
Trigger to differentiate---differentiate whether fault initiating of hardware, triggered then and continued; Otherwise circular wait, the record trouble time.
Serial port interrupt routine 1---be used for and the directional relay board communications, comprise that read failure data, fault select phase result, directional relay the result of the action, assign the software startup definite value for the directional relay plate.Utilize serial port 1;
Serial port interrupt routine 2---be used for communicating by letter, comprise and select fault data, fault phase result, directional relay the result of the action to send monitor board to, accept the definite value of assigning by monitor board with monitor board.Utilize serial port 2;
If execute protection criterion---this relay directional relay fault direction is differentiated for just, and the opposite end directional relay is differentiated also for just, and then the outlet relay board is given in relay output tripping operation pulse, exports and trips.Otherwise, do not export.Utilize 68332 delivery outlet line;
The control of high frequency machine for receiving and emitting message---start the reception of high frequency machine for receiving and emitting message, stop news, utilize 68332 input and output mouth line;
Fault data reads and transmits---and utilize serial port interrupt routine 1,2, receive the data that come from the directional relay plate, send to monitor board, record directional relay the result of the action arrives time, the traveling-wave protection relay outlet trip time of this plate.
(6) the exit relay plate 26
The effect of this plank is to increase a mechanical contacts between digital relay and breaker control circuit, ensures to form tangible fracture between trip signal and the circuit breaker.
(7) motherboard 27
The effect of this plank is that each feature board is fixed on its socket, and the interconnection between each plank is provided simultaneously.
(8) cabinet 28
All planks and components and parts are installed in an aluminium alloy cabinet the inside.
Wherein: LCD-281 model is MGL (S)-320240CCFL, is used to show relay setting, waveform, actuating of relay situation.Button-282 model is TP801, and the operations staff manages, debugs, revises when assigning definite value and use.220 volts of outlets of external interchange of supply socket-283 or direct current.
2. high frequency machine for receiving and emitting message
The high frequency machine for receiving and emitting message is the important component part of this protection system, because this protection system need compare the fault direction at transmission line two ends, so fast and reliable exchanges the essential condition that this directional information is this protection of realization.
The high frequency receipts method news machine model that this protection is used is chosen as WGC-01A.This machine for receiving and emitting message is the special-purpose hf channel equipment of 110 kilovolts of-500 kilovolts of relay protection of transmission line, and it is the product of microcomputer type, 80196 singlechip chips that central processor unit adopts Intel company to produce.
The course of work of present embodiment
Be described as follows in conjunction with Fig. 1 and Fig. 2:
1, establishing protected circuit 1 breaks down;
2, the fault point will produce the capable ripple of voltage and current of motion;
3, the voltage and current instrument transformer 6,8,7,9 (referring to Fig. 1) that is installed in circuit 1 (referring to Fig. 1) two ends will arrive their secondary sides separately to this travelling wave signal progress of disease;
4, these conversion voltage and current be connected to digital travelling wave relay 14,15 (referring to Fig. 1); Insert two voltage/voltages, the current/voltage converter plate-22 (Fig. 2) of digital travelling wave relay 14,15 respectively;
5, then, the 5 volts of weak signal approach axis relay boards 24 (referring to Fig. 2) that come out from voltage/voltage, current/voltage converter plate 22 (referring to Fig. 2).At first, insert hardware-initiated circuit through band pass filter, the process low-pass filter circuit enters sampling circuit simultaneously, is converted to be digital signal;
6, hardware-initiated circuit triggers, and notice monitor board 23 and traveling-wave protection plate 25 (referring to Fig. 2);
7, directional relay plate 24 reads in fault data to dsp chip, and executive software is declared startup;
8, after the affirmation fault takes place, carry out phase-model transformation, wavelet transformation, fault choosing phase and directional relay calculate, and the result is less than the number of bearing 2;
9, the directional relay plate sends to traveling-wave protection plate 25 (referring to Fig. 2) to this result together with fault data, fault time by passing row communication;
10, direction protection plate 25 (referring to Fig. 2) is received after the discriminating direction result of this directional relay 24 (referring to Fig. 2), " stops letter " for the high frequency machine for receiving and emitting message and orders, and waits for that simultaneously opposite end high frequency machine for receiving and emitting message " stops letter ";
11, confirm that letter also " is stopped " in the opposite end after, mean that the opposite end is also differentiated and be the positive direction fault, at this moment provide outlet " trip signal ", trip via exit relay plate 26 (referring to Fig. 2) outlet;
12, the fault data of receiving just now, fault time, fault are selected process serial communication port such as phase result, the outlet of this relay operate time send monitor board to;
13, after monitor board 23 (referring to Fig. 2) is received these information, be organized into the fault data file, check, analyze for the operations staff.
Claims (3)
1, a kind of digital travelling wave protection method for power transmission line is characterized in that, may further comprise the steps:
(1) transient voltage and the transient current travelling waves that is produced after collection and the computing electric power line fault;
(2) three-phase voltage and the popular ripple of three-phase electricity that obtain are at first implemented phase-model transformation, obtain two line mold components;
(3) implement wavelet transformation for these two line line wave components, obtain the wavelet transformation modulus maximum;
(4) ratio of calculating initial voltage capable ripple wavelet transformation modulus maximum and the capable ripple wavelet transformation of initial current modulus maximum is differentiated the direction that fault takes place, and its criterion is:
If ratio then is judged to the forward fault less than bearing 1;
If it is positive 1 that ratio equals, then be judged to reverse fault;
(5) utilize the fault direction information at radio frequency carrier channel exchange protected circuit two ends, and then do to be out of order according to the direction of both ends discrimination result and occur in the protected circuit district or the outer conclusion in district, whether the decision relaying protection exports would trip;
Its protection operating criterion is:
Being the forward fault if the direction of both ends relay is all differentiated, then is internal fault, protection outlet would trip;
If the direction of both ends relay is differentiated difference as a result, then be judged to external fault, protection is failure to actuate.
2; a kind of employing is the digital travelling wave relay of method according to claim 1; it is characterized in that: comprise be installed in insert in the cabinet on the motherboard by power supply; current/voltage; voltage/voltage changer plate; monitor board; the directional relay plate; the traveling-wave protection plate; the hardware unit that six parts of exit relay plate are formed, and be solidificated in monitor board; the directional relay plate; monitoring module in three microprocessors on the traveling-wave protection plate; the phase-model transformation module; the wavelet transformation module; the row ripple starts module; the row ripple selects phase module; complete wave impedance directional relay module; protection and algorithm routine that protection action discrimination module is formed.
3, a kind of employing transmission line digital travelling wave protection system of method according to claim 1, it is characterized in that: the end at transmission line to be protected is connected with first digital travelling wave relay and first coupled high frequency machine for receiving and emitting message, is connected with second digital travelling wave relay and second coupled high frequency transmitting-receiving news at the other end of this transmission line; Said digital travelling wave relay comprise be installed in insert in the cabinet on the motherboard by power supply; current/voltage; voltage/voltage changer plate; monitor board; the directional relay plate; the traveling-wave protection plate; the hardware unit that six parts of exit relay plate are formed, and be solidificated in monitor board; the directional relay plate; monitoring module in three microprocessors on the traveling-wave protection plate; the phase-model transformation module; the wavelet transformation module; the row ripple starts module; the row ripple selects phase module; complete wave impedance directional relay module; protection and algorithm routine that protection action discrimination module is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01143449XA CN1141768C (en) | 2001-12-28 | 2001-12-28 | Digital travelling wave protection method for power transmission line and its relay and protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01143449XA CN1141768C (en) | 2001-12-28 | 2001-12-28 | Digital travelling wave protection method for power transmission line and its relay and protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356752A CN1356752A (en) | 2002-07-03 |
| CN1141768C true CN1141768C (en) | 2004-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB01143449XA Expired - Lifetime CN1141768C (en) | 2001-12-28 | 2001-12-28 | Digital travelling wave protection method for power transmission line and its relay and protection system |
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| Country | Link |
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| CN (1) | CN1141768C (en) |
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| CN100416965C (en) * | 2004-10-12 | 2008-09-03 | 昆明理工大学 | Method for detecting voltage zero cross near fault in travelling wave protection |
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2001
- 2001-12-28 CN CNB01143449XA patent/CN1141768C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416965C (en) * | 2004-10-12 | 2008-09-03 | 昆明理工大学 | Method for detecting voltage zero cross near fault in travelling wave protection |
| CN100527557C (en) * | 2006-06-16 | 2009-08-12 | 昆明理工大学 | Ripple switching protection with different power-supply line switching |
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|---|---|
| CN1356752A (en) | 2002-07-03 |
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