CN110672969A - On-site line protection device field test system - Google Patents

On-site line protection device field test system Download PDF

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Publication number
CN110672969A
CN110672969A CN201911071297.XA CN201911071297A CN110672969A CN 110672969 A CN110672969 A CN 110672969A CN 201911071297 A CN201911071297 A CN 201911071297A CN 110672969 A CN110672969 A CN 110672969A
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China
Prior art keywords
fault
test
waveform
relay protection
protection device
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Pending
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CN201911071297.XA
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Chinese (zh)
Inventor
徐明宇
姜鹏
崔佳鹏
郝文波
陈晓光
荣爽
关万琳
刘志鹏
谷博文
王冰
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Heilongjiang Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Heilongjiang Electric Power Co Ltd
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Priority to CN201911071297.XA priority Critical patent/CN110672969A/en
Publication of CN110672969A publication Critical patent/CN110672969A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

The utility model provides a change line protection device on-spot test system, has solved current change line protection device on-spot test mode problem with high costs, inefficiency, belongs to the electric power system test field. The invention comprises a plurality of testing devices, which are positioned at a plurality of places; each testing device comprises a time synchronization system, a power test vehicle, a relay protection tester, an intelligent management unit and a fault recorder; the power test vehicle is responsible for providing a working power supply for the time synchronization system and the relay protection tester; the time synchronization system synchronizes the time of the relay protection tester with the time of the testing device at other places, and each place triggers the playback of the fault waveform at the same time and outputs the fault waveform to the corresponding relay protection tester; the relay protection tester outputs a test signal to the in-place protection device, the in-place protection device compares the test signal with a real-time standard signal, outputs an electric signal to the transformer substation, sends a message to the intelligent management unit, and the fault recorder obtains disturbance data of the relay protection tester and sends the disturbance data to the intelligent management unit.

Description

On-site line protection device field test system
Technical Field
The invention relates to a test system of a locally-formed line protection device, in particular to a field test system of a locally-formed line protection device, and belongs to the field of power system tests.
Background
The on-site protection is one of key development directions of future relay protection, the relay protection device does not depend on a merging unit and an intelligent terminal, a cable sampling cable trips after the on-site placement of the non-protection installation, the middle link is simplified, and the protection speed and the reliability can be effectively improved.
The on-site protection adopts a brand-new design concept, challenges are brought to on-site debugging and operation and maintenance, the on-site protection device needs to be tested to realize plug and play and reliable operation of the device, the technical requirements of standardization and maintenance-free of the on-site protection device are met, and the reliability and operation and maintenance level of a power grid are comprehensively improved. In the prior art, a built physical model is mainly adopted to test the in-place protection device, but the test mode has the problems of complex equipment structure, high test cost, low efficiency and the like.
Disclosure of Invention
The invention provides a field test system for an in-situ line protection device, aiming at the problems of high cost and low efficiency of the existing test mode for the in-situ line protection device.
The invention discloses a field test system for a field line protection device, which comprises a plurality of test devices, wherein each test device is used for testing the field line protection device at one site;
each testing device comprises a time synchronization system, a power test vehicle, a relay protection tester, an intelligent management unit and a fault recorder;
the time synchronization system and the relay protection tester of each testing device are placed in a power test vehicle, and the power test vehicle is responsible for providing working power supplies for the time synchronization system and the relay protection tester;
the time synchronization system is used for synchronizing the time of the relay protection tester with the time of the test devices at other places, and each place triggers the playback of the fault waveform at the same time and outputs the fault waveform to the corresponding relay protection tester;
the relay protection tester outputs a test signal to one or more in-situ protection devices, the in-situ protection devices compare the test signal with a real-time standard signal, output voltage and current signals to a transformer substation and send a message to the intelligent management unit, and the fault recorder obtains disturbance data according to the voltage and current signals output by the relay protection tester and sends the disturbance data to the intelligent management unit.
Preferably, a dynamic test model is established according to the wiring mode of the actual system of the transformer substation, the system parameters and the boundary conditions of the line parameters, a simulation fault test is carried out, and the fault waveform recorded in the test is used for replaying the fault waveform.
Preferably, the fault waveform replay includes a metallic fault waveform, a transition fault waveform, and a transition resistance fault;
the metallic fault waveform comprises a waveform simulating a metallic short-circuit fault in an occurrence region of a circuit and a waveform simulating a metallic short-circuit fault outside an occurrence region of an adjacent circuit;
the convertible fault waveform comprises a waveform for simulating the occurrence of the out-of-area single-phase earth fault on the line and a waveform for the in-area different-name-phase single-phase earth fault;
the transition resistance fault comprises a waveform simulating a single-phase high-resistance grounding fault in a generation area on a line through 100 omega and a waveform simulating a short-circuit fault between phases through 25 omega.
Preferably, the vehicle body of the electric power test vehicle is thickened and heat-preserved, and is filled with a heat-insulating material, the window of the electric power test vehicle uses double-layer heat-insulating glass, and a heating device is arranged in the electric power test vehicle.
The method has the advantages that the field test is carried out in a mode that the relay protection tester plays back the fault waveform of the movable mould, a test system is built in a movable mould laboratory in advance according to the field wiring mode and boundary conditions, faults are simulated, the fault waveform for test is formed, the structure of the test system is simplified, various faults can be tested, and the test efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic view of the installation position of the present invention;
FIG. 3 is a wiring diagram of the test current relay protection tester of the present invention;
FIG. 4 is a wiring diagram of a test current secondary loop according to the present invention;
FIG. 5 is a wiring diagram of a secondary circuit for testing voltage according to the present invention;
FIG. 6 is a wiring diagram of the moving die system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
When the on-site test system of the on-site line protection device of the embodiment is used for actual test, in order to ensure safe, orderly and planned development of test work, an organization management mode of on-site line protection on-site test is defined, a test command group is established, four working groups including a protection device test group, a management unit test group and a safety supervision group are arranged below the on-site line protection on-site test system, each working group develops work under the leadership and command of a system debugging command group, and the division of labor is responsible for relevant matters in the on-site test.
Command group: the test system is the highest command mechanism for field test work, and is responsible for coordinating the arrangement of each test project and commanding the test work and solving the problems encountered in the process.
Protection equipment test group: the system is in charge of preparing a relay protection tester, a time setting clock of the power test vehicle, an interphone and a safety helmet before debugging work is carried out, and is in charge of managing test equipment in the debugging process. And the system is responsible for carrying out test system wiring on the site, carrying out playback test on the in-situ protection and forming a test record.
Management unit test group: the intelligent management unit and the fault recorder are responsible for operating the intelligent management unit and the fault recorder indoors, recording message information on the intelligent management unit, checking the protection action condition of each test and forming a test record.
A safety supervision group: the safety monitoring system is responsible for checking various safety measures, ensuring the personal safety of testers and assisting in handling accidents.
The test system of the embodiment is suitable for field test of the in-situ line protection devices, and the in-situ line protection devices to be tested are respectively installed in the transformer substations on two sides.
As shown in fig. 1 and fig. 2, the field test system of the in-place line protection device of the present embodiment includes a plurality of test devices, each test device is used for testing the in-place line protection device at one site, and the present embodiment is directed to multi-site combined test;
each testing device comprises a time synchronization system, a power test vehicle, a relay protection tester, an intelligent management unit and a fault recorder;
the time synchronization system and the relay protection tester of each testing device are placed in a power test vehicle, and the power test vehicle is responsible for providing working power supplies for the time synchronization system and the relay protection tester; the power test vehicle provides a power supply and a working environment, and is convenient to move without moving equipment;
the time synchronization system of the embodiment is used for synchronizing the time of the relay protection tester with the time of the test devices at other places, and each place triggers the playback of the fault waveform at the same time and outputs the fault waveform to the corresponding relay protection tester; as shown in fig. 1, the present embodiment includes two test apparatuses: a is ground and B is ground; in the embodiment, the in-place protection devices are tested at various places and at the same time, and one or more in-place protection devices are arranged at each place and can be tested simultaneously. The relay protection tester outputs a test signal to one or more in-situ protection devices, the in-situ protection devices compare the test signal with a real-time standard signal, output voltage and current signals to a transformer substation and send a message to an intelligent management unit; when testing is carried out at each site, the same real-time standard signal is adopted, and the standard signal is sent by an optical fiber channel of a power grid; and the fault recorder acquires disturbance data according to the voltage and current signals output by the relay protection tester, and sends the disturbance data to the intelligent management unit, wherein the disturbance data is used for analyzing the operation characteristics and action behaviors of the on-site protection device. As shown in fig. 2, the intelligent management unit and the fault recorder according to the present embodiment are installed indoors.
The test system of the embodiment comprises current access and voltage access when in connection, and when in current access, a circuit is provided with a conventional current transformer, and the test system generally has 7 coils of secondary windings, and the purposes are respectively as follows: a first roll: protecting a set of circuits; and a second volume: two sets of line protection; and a third volume: a set of mother differences; and a fourth volume: two sets of mother-mother differences; and a fifth volume: a fault recorder; and a sixth volume: measuring and controlling; and a seventh volume: and (6) metering. The fifth volume of CT loop can be used for testing, and several sets of tested local line protection current loops are connected in series with the front side of the fault recorder. When the on-site wiring is carried out, the current inlet short circuit of the on-site terminal box is sealed, the terminal connecting piece is opened, and four wires of A \ B \ C \ N output current of the tester are connected to the current inlet terminal of the first set of protection device, as shown in fig. 3 and fig. 4. When the voltage is connected, the cable is directly connected from the 220 KV bus voltage transformer, and the trial operation devices are connected in parallel through the terminal row. During on-site wiring, a connecting piece of a voltage terminal of the in-situ terminal box needs to be opened, a voltage outlet wire of the tester is directly connected in parallel to the voltage terminal of the first set of protection device, and specific wiring is as shown in the following figure 5:
the fault waveform playback of the embodiment is obtained by establishing a dynamic simulation test model according to the boundary conditions of the actual system wiring mode, the system parameters and the line parameters of the transformer substation, performing a simulation fault test, and using the fault waveform recorded in the test for fault waveform playback, wherein a dynamic simulation system wiring diagram is shown in fig. 6. The local protection devices for the hanging net operation are arranged on two sides of an AC line, 3 fault points are arranged at outlets on two sides and outlets outside an adjacent line area during the test, the numbers of the fault points are FD1, FD3 and FD6 respectively, and each fault point can simulate metallic short-circuit faults including single-phase grounding and three-phase short-circuit faults.
The fault waveform playback of the embodiment adopts a dynamic simulation test waveform, and the dynamic simulation system is modeled according to the actual on-site wiring mode and the boundary parameters, so that the actual operation fixed value is protected during the test, and the fault record is shown in table 1:
TABLE 1
Figure BDA0002260872510000041
The fault waveform playback of the present embodiment includes a metallic fault waveform, a transitional fault waveform, and a transit resistance fault;
the metallic fault waveforms include a waveform simulating a metallic short fault in an occurrence region on a line and a waveform simulating a metallic short fault outside an occurrence region of an adjacent line, and the fault types are shown in table 2:
TABLE 2 metallic failure types
Figure BDA0002260872510000042
Figure BDA0002260872510000051
The protection action report is read through the management unit, and protection recording waves and fault recording waves of a certain test are extracted for data comparison.
The convertible fault waveform comprises a waveform of a single-phase earth fault outside a simulated line and a waveform of a single-phase earth fault of a different-name phase inside a converted area, and the conversion time is 10-200 ms. The failure types are shown in table 3 below.
TABLE 3 transition Fault types
Figure BDA0002260872510000052
The transition resistance fault comprises a waveform simulating a single-phase high-resistance grounding fault in a generation area on a line through 100 omega and a waveform simulating a short-circuit fault between phases through 25 omega. The failure types are shown in table 4 below.
TABLE 4 transition resistance Fault types
Figure BDA0002260872510000053
When the fault is replayed each time, a tester needs to inquire and record the protection report sent by the intelligent management unit.
The embodiment can also perform a power-off restart test: and (3) disconnecting the direct-current power supply of the in-situ protection device, electrifying the in-situ protection device after freezing for a plurality of hours, immediately carrying out a test project after the running light of the device is turned on, and checking whether the protection can normally act.
The test system of the present embodiment requires, in the test: after a test is finished, monitoring whether action information is sent to a real-time alarm window and whether a device action lamp is lightened or not through an intelligent management unit; and after the action lamp is confirmed to be on, reading the action report and the action time of the test on a report query interface. Reading data of a fault recorder and recording action time; recording the action behavior of the protection device of the test, and filling a test record table; and after the recording is finished, resetting the action lamp of the protection device and informing the tester to carry out the next test.
After the test system finishes testing, the test line needs to be dismantled, the local terminal box CT connecting piece is recovered, and whether current sampling is normal or not is confirmed through the management unit. And recovering the PT terminal connection piece, and confirming whether the voltage sampling is normal or not through the management unit. The test group confirmed and recorded the results of the above recovery wiring. And returning the test group by using articles such as interphones, safety helmets and the like, counting the number of people and testing equipment after the confirmation is finished, and withdrawing from the site.
Because the test time may be in winter, the temperature is mostly below-30 ℃, and the normal work of the electrical test instrument and meter equipment can not be ensured under the low temperature condition, therefore, the relay protection tester, the GPS time synchronization system and other equipment are connected with the tested on-site protection device through the centralized interface in a mobile vehicle-mounted integrated mode, thereby being convenient for the test.
The vehicle body of the electric power test vehicle of the embodiment is thickened and heat-preserved, and is filled with a heat-insulating material, the window of the electric power test vehicle uses double-layer heat-insulating glass, and a heating device is arranged in the electric power test vehicle.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (4)

1. An in-situ line protection device field test system, the system comprising a plurality of test devices, each test device for testing an in-situ protection device at a site;
each testing device comprises a time synchronization system, a power test vehicle, a relay protection tester, an intelligent management unit and a fault recorder;
the time synchronization system and the relay protection tester of each testing device are placed in a power test vehicle, and the power test vehicle is responsible for providing working power supplies for the time synchronization system and the relay protection tester;
the time synchronization system is used for synchronizing the time of the relay protection tester with the time of the test devices at other places, and each place triggers the playback of the fault waveform at the same time and outputs the fault waveform to the corresponding relay protection tester;
the relay protection tester outputs a test signal to one or more in-situ protection devices, the in-situ protection devices compare the test signal with a real-time standard signal, output voltage and current signals to a transformer substation and send a message to the intelligent management unit, and the fault recorder obtains disturbance data according to the voltage and current signals output by the relay protection tester and sends the disturbance data to the intelligent management unit.
2. The in-situ line protection device field test system of claim 1, wherein a dynamic test model is established according to the actual system wiring mode of the substation, system parameters and boundary conditions of the line parameters to perform a simulated fault test, and a fault waveform recorded in the test is used for fault waveform playback.
3. The in-place line protection device field test system of claim 2, wherein the fault waveform playback comprises a metallic fault waveform, a transition fault waveform, and a transition resistance fault;
the metallic fault waveform comprises a waveform simulating a metallic short-circuit fault in an occurrence region of a circuit and a waveform simulating a metallic short-circuit fault outside an occurrence region of an adjacent circuit;
the convertible fault waveform comprises a waveform for simulating the occurrence of the out-of-area single-phase earth fault on the line and a waveform for the in-area different-name-phase single-phase earth fault;
the transition resistance fault comprises a waveform simulating a single-phase high-resistance grounding fault in a generation area on a line through 100 omega and a waveform simulating a short-circuit fault between phases through 25 omega.
4. The in-situ line protection device field test system of claim 1, wherein the vehicle body of the power test vehicle is thickened and insulated and filled with heat insulation materials, the window of the power test vehicle uses double-layer heat insulation glass, and a heating device is arranged in the power test vehicle.
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