EP3472635A1 - Prüfgerät und verfahren zum prüfen eines überwachungsgeräts mit wanderwellenerfassung - Google Patents
Prüfgerät und verfahren zum prüfen eines überwachungsgeräts mit wanderwellenerfassungInfo
- Publication number
- EP3472635A1 EP3472635A1 EP17730794.9A EP17730794A EP3472635A1 EP 3472635 A1 EP3472635 A1 EP 3472635A1 EP 17730794 A EP17730794 A EP 17730794A EP 3472635 A1 EP3472635 A1 EP 3472635A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- voltage
- low
- test
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/265—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured making use of travelling wave theory
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2827—Testing of electronic protection circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2839—Fault-finding or characterising using signal generators, power supplies or circuit analysers
- G01R31/2841—Signal generators
Definitions
- the present invention relates to a test apparatus for testing a traveling wave detection monitor, and a method of testing a traveling wave detection monitor.
- An energy transmission network essentially consists of energy generators, switchgears, substations and power lines (overhead lines or underground cables). To the power transmission network electrical consumers are connected. Furthermore, as a rule, there are still various monitoring and safety devices which switch off certain network sections, for example in the case of faults in the energy transmission network. The power lines extend over many kilometers. An important functionality of the monitoring of a power transmission network is therefore not only the detection of errors, but also the most accurate location of errors. The faster an error is detected, the faster the network section can be switched off. The more accurately the fault location can be determined, the quicker a fault can be found and corrected by the maintenance personnel and the faster a disconnected network section can be switched on again. There is a wealth of methods for error detection and fault location in the prior art.
- One of these methods is the method of detecting traveling waves. This method is based on the fact that in the event of a fault starting from the fault location, a traveling wave propagates in both directions via the power line. The time that elapses until the traveling wave is detected in a stationarily arranged protective device can be measured and concluded therefrom with the known propagation speed of the traveling wave to the fault location. After a traveling wave can also be triggered on other events on the power line, for example in the case of a switching operation, these methods can also distinguish between errors and other events. When traveling wave process often the arrival of a traveling wave at both ends of a conductor is detected with two temporally exactly synchronized protection devices, which allows easy determination of the fault location.
- the traveling wave is highly transient with flank rise times in the range of a few 100ns and can In high-voltage networks, the traveling wave on the conductor can reach peak currents of a few 100 to 1000 A and voltage peaks of a few 100 to 1000 kV., These are usually very high primary currents and voltages on the power line via current / voltage converter on transformed lower secondary values and these supplied to the protection devices. On the secondary side, too, high current and voltage peaks occur.
- the traveling wave can also be closed to certain types of errors, for example, a single-pole ground fault (short circuit of a conductor to ground) generates a different traveling wave than a conductor-conductor fault between two conductors.
- the method of detecting traveling waves enables a very rapid and accurate detection and location of errors.
- the method of detecting traveling waves is therefore used not only to detect and locate a fault, but also to generate a tripping pulse for switchgear for disconnecting network sections.
- monitoring devices are not only used in protective devices, but also in fault locations, ie in devices that are used only to locate a fault, or fault recorder, so devices only record the error.
- Protective devices, fault locators and fault recorders, as well as other devices for monitoring and / or diagnosing an energy transmission network are generally referred to below as monitoring devices.
- Monitoring devices are placed in power transmission network fixed at specific locations. For safety reasons, the monitoring devices must be checked for proper operation during commissioning and, as a rule, also at regular intervals.
- a monitor is tested directly in the field on site by the monitor is separated from the power transmission network and / or connected to a switchgear and is connected to a special tester. The tester can be used to simulate various network conditions and to check the correct response of the monitor to it.
- the low-frequency fault currents can be up to 100A (secondary values). So it would be an amplifier required, on the one hand can generate very high currents and voltages and on the other hand, at the same time can generate very high-frequency currents and voltages. In addition, such amplifiers usually can not provide the required for the replica of a traveling wave steep flanks of the current and / or voltage signals. In addition, for a field test in a system with monitoring devices at both, or even more ends, the power line must also use multiple distributed test equipment, which further complicates the test.
- the object of the invention is therefore to specify a test device and a test method for a monitoring device with traveling wave detection, which enable an integrated test of the monitoring device in the field, as they are also installed in real operation.
- a synchronization interface is provided on the test device in order to connect the test device to a, preferably high-precision, time synchronization source. This is particularly advantageous when several test equipment must work together for a test. If a test control unit is provided as part of the test apparatus, wherein the simulation unit is implemented in the test control unit, several distributed monitoring devices can be tested particularly advantageously. All that is required is to connect the test control unit to the several testers for testing the monitoring equipment. The fault simulation can then be carried out centrally on the test control unit. For this purpose, the testers are preferably synchronized with one another in terms of time.
- FIG. 1 shows a topology of a power transmission network with monitoring devices
- FIG. 3 shows a test configuration for testing the monitoring devices by means of testing devices according to the invention
- FIG. 1 shows schematically a part of a power transmission network 1 with a line section 2 with a power line 3.
- the power line 3 can be designed as an overhead line or as underground cable, which is irrelevant to the invention.
- A, B the ends of the line section 2 and the power line 3 are designated.
- the ends A, B are often provided by substations 4 or switchgear 5.
- monitoring devices 6 are also often provided in power transmission networks 1, e.g. the error detection and fault location are used.
- the monitoring devices 6 can also trigger switching operations of a switchgear 5, as indicated by dashed lines in Figure 1.
- a monitoring device 6 detects the voltage and / or the current on the power line 3 in order to fulfill its function.
- an energy transmission network can also be multiphase.
- monitoring devices 6 may be provided at each phase, or multi-phase monitoring devices 6 may be used.
- other network topologies are conceivable. For example, could also branch off between the ends A, B in Figure 1, a further power line, as indicated by dashed lines in Figure 1, at the end C, a further monitoring device 6 could be arranged.
- An error F on the power line 3 generates a current and a voltage pulse which propagates in both directions as a traveling wave W.
- the propagation velocity v w of the traveling wave W is approximately the speed of light and is known.
- monitoring devices 6 are arranged with traveling wave detection, which detect the voltage U L and / or the current I L on the power line 3 and evaluate.
- a current and / or voltage converter can also be connected in order to transform the high primary currents and / or voltages on the power line 3 into lower secondary currents and / or voltages which are supplied to the monitoring device 6 ,
- the time t A i or t B i of the arrival of the traveling wave W in the respective monitoring device 6 can be detected.
- the distance L between the two monitoring devices 6 is known. Assuming that the two monitoring devices 6 are exactly synchronized in time, which is indicated by the dashed connection, the fault location x can easily be derived from the relationship
- X " ⁇ ( L + ( t A " t B) 'V w).
- the monitoring devices 6 exchange the arrival times t A , t B.
- the monitoring device 6 or the cooperating monitoring devices 6 are suspended from the power line 3 and connected to a test device 10, as shown in Figure 3.
- a test device 10 generates a test voltage U T and / or a test current I T , which are supplied to the connected monitoring device 6 via its respective voltage and current input.
- the tester 10 generates the secondary quantities according to the current / voltage transformers of the power line 3.
- appropriate cables for connecting the monitoring device 6 may be provided with a tester 10.
- a tester 10 may be executed again multi-phase, for example, to be connected to a multi-phase monitoring device 6.
- a test apparatus 10 In order to enable a realistic on-site test, a test apparatus 10 generates the temporal current course I T (t) and voltage curve U T (t), which at a certain point of the power line 3 in the case of a specific error F at a Failure point x can be expected.
- the test apparatus 10 is constructed as explained below with reference to FIG.
- a simulation unit 12 (hardware and / or software) is provided, in which the time course of the low-frequency component of the error quantities, ie the low-frequency fault currents l F (t) and / or low-frequency error voltages U F (t) are simulated ,
- a line model that simulates these error variables can be implemented in the simulation unit 12.
- the line model can be a model of the line with fixed quantities.
- a more realistic line model with a dynamic simulation of the transient curves of current and voltage can also be implemented.
- the time profile of the low-frequency component of current and voltage on the power line 3 need not be calculated with particularly high sampling rates.
- the low-frequency fault current I F (t) and / or the low-frequency fault voltage U F (t) are calculated, for example, at a sampling rate in the kHz range (that is to say a few current or voltage values per ms) Reduced paperwork.
- the simulation thus calculates the low-frequency fault current I F (t) and the low-frequency fault voltage U F (t) at a location of the power line 3 which lies at a distance x or Lx from an assumed or predetermined fault location F, thus in particular the time course the low-frequency error quantities at the ends A, B at which the monitoring device 6 is arranged.
- Low frequency means frequency components between fundamental (50Hz / 60Hz) and harmonics up to the single-digit kHz range, eg 1 -3kHz.
- the simulation can also simulate various types of faults (eg earth faults, line faults, etc.) with different characteristics.
- the test can also be configured via a user interface 13, for example by specifying a fault location F and / or a fault type.
- the simulated time profile of the low-frequency error variables is fed to a control unit 1 1, which thus controls a voltage amplifier 14 and / or a current amplifier 15, for example via digital-to-analog converter DAC.
- the voltage amplifier 14 generates the low-frequency voltage component U Tn of the test voltage U T requested from the simulation.
- the current amplifier 15 generates at the respective sampling times the demanded from the simulation low-frequency current component l Tn of the test current l T.
- the voltage amplifier 14 and the current amplifier 15 need for this no high bandwidth (no fast voltage or current changes) and can thus be easily realized.
- the high-transient (ie high-frequency) traveling wave W which is detected by a monitoring device 6 with traveling wave detection per se, can thus due to the low Bandwidth, however, can not be generated.
- a voltage pulse generator 16 and / or a current pulse generator 17 are provided in the test apparatus 10.
- the simulation unit 12 also calculates the time t A , t B of the arrival of the traveling wave W at the location of the monitoring device 6, for example using the above equations.
- the time t A , t B of the arrival of the traveling wave W could, however, also be calculated from a highly dynamic simulation model with high sampling rates of the calculation (> 1 MHz).
- the necessary requirements such as the distance L between two monitoring devices 6 or a propagation velocity v w of the traveling wave W, are known or can be configured again via the user interface 13 for this purpose.
- the control unit 11 activates the voltage pulse generator 16 and / or the current pulse generator 17, which then generate a high-voltage voltage pulse U T and / or current pulse I T simulating the traveling wave W low-frequency voltage component U Tn or the low-frequency current component l Tn superimposed and output as an error voltage U T at a voltage output or as a fault current l T at a current output.
- flank rise times in the range of several 100ns and pulse durations in ⁇ ⁇ - ⁇ at currents in the range of 1 to 100A (secondary value) or voltages in the range of 50 to 250V (secondary value) are typical. These requirements can be achieved with conventional or simply constructed pulse generators.
- a test device 10 may also have a synchronization interface 18 to a time synchronization source 19, such as a GPS clock with a typical accuracy of less than 100 ns. On this time synchronization source 19 then multiple testers 10 can synchronize.
- each monitor 6 is connected to a tester 10.
- Each involved testing device 10 can control itself, for example, whereby the individual testing devices 10 are synchronized with each other in time in order to simulate the traveling waves W at the right time.
- One of the testing devices 10 involved could also take over the control of other testing devices 10 involved in the test. In this case, it would also be sufficient to carry out the simulation of the traveling wave W, and possibly also of the low-frequency error variables, only in a test device 10, which can then send the simulation result and / or corresponding control signals to the other test devices 10.
- the test devices 10 can be connected to one another via a data communication network via which the simulation result and / or the control signals can be transmitted.
- corresponding data communication interfaces in the test devices 10 are then provided. The temporal synchronization of the test devices 10 could also take place via the data communication network.
- a test control unit 20 for example a computing unit with corresponding test software, can be provided, which is connected to the test devices 10 involved in the test. If the two testers 10 are too far apart, the connection may also be realized via suitable data communication interfaces.
- the test control unit 20 can be used to control the synchronized execution of the test, for example the start of the test. After the tester 10 are synchronized in time, they can each output the test voltage U T and / or the test Ström l T synchronized in time.
- the test control unit 20 may also include the simulation unit 12 and the low-frequency error variables U F (t), l F (t) and the times t A , t B of the occurrence of the traveling wave W at the location of the Monitor monitors 6, as shown in Figure 5.
- the test control unit 20 thus forms part of the testing device 10 involved. In the individual test devices 10, only the control unit 1 1 is then available,
- simulation unit 12 and control unit 11 are provided, which can simulate the traveling wave propagation of all phases.
- the simulation unit 12 can also be integrated in the control unit 11.
- the simulation unit 12 can also be implemented as software, e.g. as simulation software with a simulation model.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT505592016 | 2016-06-20 | ||
PCT/EP2017/064887 WO2017220465A1 (de) | 2016-06-20 | 2017-06-19 | Prüfgerät und verfahren zum prüfen eines überwachungsgeräts mit wanderwellenerfassung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3472635A1 true EP3472635A1 (de) | 2019-04-24 |
Family
ID=59070673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17730794.9A Withdrawn EP3472635A1 (de) | 2016-06-20 | 2017-06-19 | Prüfgerät und verfahren zum prüfen eines überwachungsgeräts mit wanderwellenerfassung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3472635A1 (de) |
WO (1) | WO2017220465A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112578326A (zh) * | 2020-11-19 | 2021-03-30 | 国网电力科学研究院武汉南瑞有限责任公司 | 一种适用于故障行波定位的模拟试验平台 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5576625A (en) * | 1994-02-07 | 1996-11-19 | Kabushiki Kaisha Toshiba | Test method and apparatus for testing a protective relay system |
CN1295517C (zh) * | 2003-09-30 | 2007-01-17 | 昆明理工大学 | 一种用于测试行波保护装置的方法 |
CA2850834C (en) * | 2011-10-12 | 2015-12-29 | Schweitzer Engineering Laboratories, Inc. | Fault location using traveling waves |
EP3363087A4 (de) * | 2015-10-13 | 2019-06-26 | Schweitzer Engineering Laboratories, Inc. | Prüfsystem für wanderwellenfehlerdetektoren |
-
2017
- 2017-06-19 EP EP17730794.9A patent/EP3472635A1/de not_active Withdrawn
- 2017-06-19 WO PCT/EP2017/064887 patent/WO2017220465A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
WO2017220465A1 (de) | 2017-12-28 |
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