CN113866526A - One-time simulation live test system and method for intelligent substation - Google Patents
One-time simulation live test system and method for intelligent substation Download PDFInfo
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- CN113866526A CN113866526A CN202110909767.6A CN202110909767A CN113866526A CN 113866526 A CN113866526 A CN 113866526A CN 202110909767 A CN202110909767 A CN 202110909767A CN 113866526 A CN113866526 A CN 113866526A
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- 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
Abstract
The invention discloses a primary simulation live test system and a method for an intelligent substation, which comprises the following steps: the intelligent substation intelligent monitoring system comprises a maintenance power box serving as a voltage source, a relay protection tester serving as a current source and intelligent substation IED equipment; the maintenance power box is used for simultaneously boosting three phases of each voltage class side of the intelligent substation; the relay protection tester is used for respectively and simultaneously carrying out current rise on the three phases at each voltage class side; the intelligent substation IED equipment is used for verifying the correctness of the PT and CT secondary circuits on each voltage class side and the correctness of the relation between the three-phase voltage and the current phase according to the equipment sampling value under the minimum precision. The primary simulation live-line test system and the method provided by the invention can verify the correctness of the relation between the three-phase voltage and the current phase in real time while verifying the correctness of the PT and CT secondary circuits under the conditions of time saving, labor saving and equipment saving, thereby greatly improving the test efficiency.
Description
Technical Field
The invention relates to the technical field of intelligent substation debugging, in particular to a primary simulation live test system and a primary simulation live test method for an intelligent substation.
Background
With the continuous development of the intelligent transformer substation, the debugging technology is more and more mature, and no fatal defect can be generated in the operation of the intelligent transformer substation. However, some operation failures still exist, and most of the reasons are caused by incorrect PT and CT secondary circuits or incorrect phase relation of three-phase voltage and current. Therefore, the method is crucial to carrying out a primary simulation live test on the transformer substation before operation, and can be used for monitoring and analyzing various data in real time through sampling of all IED equipment of the secondary system and checking the correctness of the PT, CT loops and the phase relation of current and voltage.
In the existing one-time simulation live test, phase-splitting boost and boost flow are often realized on each voltage class side by using large-scale boost and boost equipment, so that a single-phase operation state is simulated, and the accuracy of each sampling device and each loop is verified by utilizing the display value of the total-station IED sampling device and monitoring and measuring data in real time. The single-phase voltage-regulating current-rising method has the advantages of multiple used test equipment, large workload and long time consumption, and the phase relation of three-phase voltage and current cannot be detected in real time in the process of detecting secondary loops of PT and CT.
In summary, how to provide a primary simulation live-line test system capable of verifying the phase relationship between the three-phase voltage and the current of the intelligent substation is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a primary simulation live-line test system and a primary simulation live-line test method for an intelligent substation, and aims to solve the problem that the relation between three-phase voltage and current phases cannot be detected in real time in the process of verifying PT and CT secondary loops of the intelligent substation in the primary simulation live-line test method in the prior art.
In order to solve the technical problem, the invention provides a primary simulation live test system of an intelligent substation, which comprises: the intelligent substation intelligent monitoring system comprises a maintenance power box serving as a voltage source, a relay protection tester serving as a current source and intelligent substation IED equipment; the maintenance power box is used for simultaneously boosting three phases of each voltage class side of the intelligent substation; the relay protection tester is used for respectively and simultaneously carrying out current rise on the three phases at each voltage class side; the intelligent substation IED equipment is used for verifying the correctness of the PT and CT secondary circuits on each voltage class side and the correctness of the relation between the three-phase voltage and the current phase according to the equipment sampling value under the minimum precision.
Preferably, the service power box is specifically configured to:
after a pre-selection isolating switch and a pre-selection disconnecting link on the high-voltage side of the intelligent substation are closed, boosting the voltage of a high-voltage side bus in the same phase A, phase B and phase C;
after a pre-selection isolating switch and a pre-selection disconnecting link on the medium-voltage side of the intelligent substation are closed, boosting the voltage of a medium-voltage side bus when the phases A, B and C are the same;
and after the pre-selection isolating switch and the pre-selection disconnecting link on the low-voltage side of the intelligent substation are closed, boosting the voltage of the low-voltage side bus when the phases A, B and C are the same.
Preferably, the relay protection tester is specifically configured to:
when the phases A, B and C of the preset loop at the high-voltage side are the same, current is introduced so that the current is output from the line 1 hung on the high-voltage side I bus and flows out from the grounding disconnecting link of the line 2 hung on the high-voltage side II bus through the bus coupler;
when the phases A, B and C of the preset loop at the medium voltage side are the same, current is introduced so that the current is output from the medium voltage side of a first main transformer hung on a medium voltage side I bus and flows out from a medium voltage side earthing switch of a second main transformer hung on a medium voltage side II bus through segmentation;
and when the phases A, B and C of the preset loop at the low-voltage side are the same, current is introduced so that the current is output from the low-voltage side of a first main transformer hung on a low-voltage side I bus and flows out from a low-voltage side grounding knife switch of a second main transformer hung on a low-voltage side II bus through segmentation.
Preferably, the intelligent substation IED device comprises: the control system comprises a control cubicle, a protection device, a measurement and control device, a network distribution device, a fault recording device, an electric meter and an electric energy sampling device.
Preferably, the intelligent substation IED device is further configured to: verifying the correctness of the sampling value of the sampling terminal of the control cubicle, the sampling value of the protection device, the sampling value of the measurement and control device, the sampling value of the network distribution device, the sampling value of the fault recording device, the sampling value of the electric meter and the sampling value of the electric energy sampling device.
Preferably, the fault recording device is configured to:
and verifying the correctness of the PT transformation ratio, the CT transformation ratio and the CT polarity on each voltage grade side and the relation between the three-phase voltage and the current phase according to the recorded data of the waveform schematic diagram.
Preferably, the method further comprises the following steps: and the universal meter is used for measuring the voltage value of the intelligent substation voltage secondary circuit so as to verify the correctness of the PT secondary circuits on the voltage class sides.
Preferably, the method further comprises the following steps: and the alternating current clamp ammeter is used for measuring the current value of the current secondary circuit of the intelligent substation so as to verify the correctness of the CT secondary circuit at each voltage class side.
Preferably, the method further comprises the following steps: the air switch with the leakage protection function is used for protecting a test power line.
The invention also provides a primary simulation live test method of the intelligent substation, which comprises the following steps:
the maintenance power box is utilized to simultaneously boost the three phases of each voltage class side of the intelligent substation;
verifying the correctness of the PT secondary circuits at each voltage class side and the phase relation of the three-phase voltage according to the equipment sampling value of the intelligent substation IED equipment under the minimum precision;
utilizing a relay protection tester to simultaneously flow up the three phases at each voltage class side;
and verifying the correctness of the CT secondary circuits at each voltage class side and the phase relation of the three-phase current according to the equipment sampling value of the intelligent substation IED equipment under the minimum precision.
According to the primary simulation live test system provided by the invention, the overhaul power box is used as a test voltage source, and three phases of all voltage grade sides of the intelligent substation are boosted simultaneously; the relay protection tester is used as a test current source, and three phases of all current grade sides of the intelligent substation are simultaneously subjected to current rise. Because the sampling precision of the intelligent substation IED equipment can reach 0.01 time of rated voltage and rated current, the phase relation of three-phase voltage and current at each voltage class side can be verified in real time while PT and CT secondary circuits at each voltage class side are verified only by ensuring that the secondary equipment can obtain correct sampling values under the minimum precision. The system provided by the invention fills the blank that the single-phase voltage-regulating current-rising method cannot monitor the phase relation between the three-phase voltage and the current in real time, shortens the time required by the test, reduces the safety risk, saves the test cost and has strong operability.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a wiring diagram of a 110kV intelligent substation;
FIG. 2 is a schematic diagram of three-phase simultaneous boosting at the high-voltage side of the intelligent transformer station;
FIG. 3 is a schematic diagram of a high side I bus protection voltage waveform;
FIG. 4 is a schematic of a high side I parent metering voltage waveform;
FIG. 5 is a schematic voltage waveform of the high side II bus protection;
FIG. 6 is a schematic of a high side II parent metering voltage waveform;
FIG. 7 is a schematic diagram of three-phase simultaneous boosting at the medium-voltage side of the intelligent transformer station;
FIG. 8 is a schematic diagram of protection voltage waveforms of a middle voltage side I bus and a middle voltage side II bus;
FIG. 9 is a graph showing the voltage waveforms of the I and II mother metering at the middle pressure side;
FIG. 10 is a schematic diagram of three-phase simultaneous boosting at the low-voltage side of the intelligent transformer station;
FIG. 11 is a schematic diagram of protection voltage waveforms of a low-voltage side I bus and a low-voltage side II bus;
FIG. 12 is a graph showing the voltage waveforms of the I and II parent metering at the low voltage side;
FIG. 13 is a schematic diagram of three-phase simultaneous upwash at the high-voltage side of the intelligent transformer station;
FIG. 14 is a schematic diagram of the protection current waveform of the high-side line 1;
FIG. 15 is a schematic diagram of the measured current waveform of the high side line 1;
FIG. 16 is a schematic diagram of a high-side bus tie protection current waveform;
FIG. 17 is a schematic diagram of a high-side bus-bar current waveform;
FIG. 18 is a schematic diagram of the protection current waveform of the high side line 2;
FIG. 19 is a schematic diagram of the protection current waveform of the high side line 2;
FIG. 20 is a schematic diagram of three-phase simultaneous upwash at the medium-voltage side of the intelligent transformer station;
FIG. 21 is a schematic diagram of a protection current waveform at the medium voltage side of a #1 main transformer;
FIG. 22 is a schematic view of a waveform of a measured current at the medium voltage side of the #1 main transformer;
FIG. 23 is a schematic diagram of a protection current waveform at the medium voltage side of a #2 main transformer;
FIG. 24 is a schematic diagram of a measured current waveform at the medium voltage side of the #2 main transformer;
FIG. 25 is a schematic diagram of three-phase simultaneous upwash at the low-voltage side of the intelligent transformer station;
FIG. 26 is a schematic diagram of a protection current waveform at the low-voltage side of a main transformer of # 1;
FIG. 27 is a schematic view of a waveform of a measured current at a low-voltage side of a main transformer of # 1;
FIG. 28 is a schematic diagram of a protection current waveform at the low-voltage side of a main transformer of # 2;
FIG. 29 is a schematic view of a waveform of a measured current at a low-voltage side of a main transformer of # 2;
fig. 30 is a flowchart of a primary simulated live test method of an intelligent substation according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a primary simulation live test system and a primary simulation live test method for an intelligent substation, which can realize verification of correctness of PT (potential transformer) and CT (current transformer) secondary circuits and analysis of voltage-current three-phase relation under the conditions of time saving, labor saving and equipment saving.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The primary simulation live test system of the intelligent substation provided by the embodiment of the invention specifically comprises: the intelligent substation intelligent monitoring system comprises a maintenance power box serving as a voltage source, a relay protection tester serving as a current source and intelligent substation IED equipment; the maintenance power box is used for simultaneously boosting three phases of each voltage class side of the intelligent substation; the relay protection tester is used for respectively and simultaneously carrying out current rise on the three phases at each voltage class side; the intelligent substation IED equipment is used for verifying the correctness of the PT and CT secondary circuits on each voltage class side and the correctness of the relation between the three-phase voltage and the current phase according to the equipment sampling value under the minimum precision.
The primary simulation electrification testing system provided by the embodiment of the invention further comprises: the device comprises a universal meter, an alternating current clamp ammeter, a current rising and voltage rising line, a grounding wire, an air switch with leakage protection, a test power line, grounding pliers, insulating gloves, an insulating rod, a megger, an electroscope and the like. The universal meter is used for measuring the voltage value of the intelligent substation voltage secondary circuit so as to verify the correctness of the PT secondary circuits on the voltage class sides. The alternating current clamp-on ammeter is used for measuring the current value of the current secondary circuit of the intelligent substation so as to verify the correctness of the CT secondary circuit at each voltage class side. The flow rising and pressure rising line is used for flow guiding and pressure rising. The connecting wire is used for test grounding. The air switch with the electric leakage protection function is used for protecting a test power line. The test power line is a power supply of the test device. The insulating rod is matched with the current rising and voltage rising line for use. The megohmmeter is used for insulation resistance testing. The electroscope is used for testing whether primary equipment is electrified or not.
Because the sampling precision of the intelligent substation IED equipment can reach 0.01 time of rated voltage and rated current, the target can be realized as long as the secondary equipment can obtain a correct sampling value under the minimum precision and is analyzed. The intelligent substation IED equipment comprises a control cubicle, a protection device, a measurement and control device, a network division device, a fault recording device, an electric meter, an electric energy sampling device and the like. The voltage value and the current value of the secondary sampling terminal of the control cubicle can be measured by a multimeter and an alternating current clamp ammeter, and the sampling data of a protection device, a measurement and control device, a network division device, a fault recording device, an electric meter and the like can be directly read from the device, so that the correctness of the relation between PT (potential Transformer) and CT (current transformer) secondary circuits and the phase of three-phase voltage and current can be verified.
Due to the data acquired by the fault recorder and the recorded waveforms, the PT transformation ratio, the CT transformation ratio and the CT polarity of each voltage class side of the intelligent substation and the correctness of the phase relation between three-phase voltage and three-phase current can be verified more visually. Therefore, in the following embodiments provided by the present invention, the PT and CT secondary circuits and the three-phase voltage and current phase relationship on each voltage class side are analyzed and verified by using the data of the waveform schematic diagram recorded by the fault recorder.
According to the equipment sampling value of the intelligent substation IED equipment under the minimum precision, the correctness of analyzing PT and CT secondary circuits of each voltage class side can be verified, the phase relation of three-phase voltage and current of each voltage class side can also be verified, and meanwhile, the verification of the sampling correctness of the total substation IED equipment can also be realized. For example, when the sampling value of the protection device has obvious errors with the sampling value of the sampling terminal of the control cubicle, the sampling value of the measurement and control device, the sampling value of the network distribution device, the sampling value of the fault recording device, the sampling value of the electric meter and the sampling value of the electric energy sampling device, the abnormal sampling value of the protection device is indicated.
In the embodiment provided by the invention, a 110kV intelligent substation is taken as an example, the principles of other voltage-class intelligent substations are the same, and the wiring of the 110kV intelligent substation is shown in figure 1.
The invention utilizes a 380V maintenance power box as a voltage source to simultaneously pressurize three phases at each voltage level side, and can obtain three-phase positive sequence voltage with 220V phase voltage. The voltage transformation ratio of the high-voltage side of the intelligent substation in the test is 110kV:100V, and the current transformation ratio is 600: 5; the voltage transformation ratio of the medium-voltage side is 35kV:100V, and the current transformation ratio is 1200: 5; the voltage transformation ratio of the low-voltage side is 10kV:100V, and the current transformation ratio is 3000: 5. The single-phase voltage of the universal meter measured to overhaul the power box is 234V.
The positions of a high-voltage side interval switch and a disconnecting link of the intelligent substation station are set in the mode shown in fig. 2, and the voltage of the high-voltage side bus is boosted when the phases A, B and C are the same by using the 380V overhaul power box. After three-phase voltage is simultaneously applied to the high-voltage side in the manner shown in fig. 2, the fault recorder is utilized to obtain fig. 3, fig. 4, fig. 5 and fig. 6, wherein fig. 3 is a schematic diagram of a protection voltage waveform of the high-voltage side I bus, fig. 4 is a schematic diagram of a metering voltage waveform of the high-voltage side I bus, fig. 5 is a schematic diagram of a protection voltage waveform of the high-voltage side II bus, and fig. 6 is a schematic diagram of a metering voltage waveform of the high-voltage side II bus. Through the data of the waveform schematic diagram, the primary phase voltage is 235.4V, the A, B, C three-phase phases are 0 degrees, -120 degrees and 120 degrees respectively, and the PT secondary circuit on the high-voltage side of the 110kV intelligent substation is correct in transformation ratio and phase relation.
And setting the positions of a medium-voltage side interval switch and a disconnecting link of the intelligent substation in the mode shown in fig. 7, and boosting the voltage of the medium-voltage side bus in the same phase A, phase B and phase C by using the 380V maintenance power box. After three-phase voltages are simultaneously applied to the medium-voltage side in the manner shown in fig. 7, fig. 8 and fig. 9 are obtained by using the fault recorder, wherein fig. 8 is a schematic diagram of protection voltage waveforms of the medium-voltage side I bus and the medium-voltage side II bus, and fig. 9 is a schematic diagram of measurement voltage waveforms of the medium-voltage side I bus and the medium-voltage side II bus. Through the data of the waveform schematic diagram, according to the transformation ratio, the phases of three phases of 233V and A, B, C of the primary phase voltage can be calculated to be 0 degrees, -120 degrees and 120 degrees respectively, and the PT secondary circuit and the transformation ratio of the medium-voltage side of the 110kV intelligent substation are correct and the phase relationship is correct.
The positions of a low-voltage side interval switch and a disconnecting link of the intelligent substation station are set in the mode shown in fig. 10, and the voltage of the low-voltage side bus is boosted when the phases A, B and C are the same by using the 380V maintenance power box. After three-phase voltages are simultaneously applied to the low-voltage side in the manner shown in fig. 10, fig. 11 and fig. 12 are obtained by using the fault recorder, where fig. 11 is a schematic diagram of protection voltage waveforms of the low-voltage side I bus and the low-voltage side II bus, and fig. 12 is a schematic diagram of measurement voltage waveforms of the low-voltage side I bus and the low-voltage side II bus. Through the data of the waveform schematic diagram, according to the transformation ratio, the phases of the primary phase voltage of 230V and the A, B, C three phases of 0 degree, -120 degrees and 120 degrees can be calculated, and the PT secondary circuit on the low-voltage side of the 110kV intelligent substation is correct in transformation ratio and phase relation.
The invention adopts an analog relay protection tester to lead the current of the A phase 15A, 0 degree, the B phase 15A, -120 degree and the C phase 15A, 120 degree to the high-voltage side line 1 in the mode of figure 13, so that the current is output from the line 1 hung on the high-voltage side I bus and flows out from the grounding disconnecting link of the line 2 hung on the high-voltage side II bus through the bus coupling. Fig. 14, fig. 15, fig. 16, fig. 17, fig. 18 and fig. 19 are obtained on the fault recorder, where fig. 14 is a schematic diagram of a protection current waveform of the high-voltage side line 1, fig. 15 is a schematic diagram of a measured current waveform of the high-voltage side line 1, fig. 16 is a schematic diagram of a high-voltage side bus-bar protection current waveform, fig. 17 is a schematic diagram of a high-voltage side bus-bar measured current waveform, fig. 18 is a schematic diagram of a protection current waveform of the high-voltage side line 2, and fig. 19 is a schematic diagram of a protection current waveform of the high-voltage side line 2. According to the data of the waveform schematic diagram, the three-phase current magnitude can be calculated to be 15A according to the transformation ratio. Phase A of the circuit 1 is 180 degrees, phase B is 60 degrees, and phase C is-60 degrees; the A phase of the bus-tie is 0 degree, the B phase is-120 degrees, and the C phase is 120 degrees; the A phase of the line 2 is 0 degree, the B phase is-120 degrees, the C phase is 120 degrees, and the bus points to the line in the positive direction, so that the CT secondary circuit and the transformation ratio of the high-voltage side of the 110kV intelligent substation are correct, and the relation between the polarity and the phase is correct.
The current of A phases 15A and 0 degrees, B phases 15A and 120 degrees and C phases 15A and 120 degrees are introduced to the medium-voltage side of the #1 main transformer by adopting an analog quantity relay protection tester in a mode of figure 20, and the current is output from the medium-voltage side of the #1 main transformer hung on a medium-voltage side I bus and flows out from a medium-voltage side grounding knife brake of a #2 main transformer hung on a medium-voltage side II bus through segmentation. Fig. 21, fig. 22, fig. 23 and fig. 24 are obtained on the fault recorder, where fig. 21 is a schematic diagram of a waveform of a protection current at the medium voltage side of the #1 main transformer, fig. 22 is a schematic diagram of a waveform of a measurement current at the medium voltage side of the #1 main transformer, fig. 23 is a schematic diagram of a waveform of a protection current at the medium voltage side of the #2 main transformer, and fig. 24 is a schematic diagram of a waveform of a measurement current at the medium voltage side of the #2 main transformer. According to the data of the waveform schematic diagram, the three-phase current magnitude can be calculated to be 15A according to the transformation ratio. Phase A of the #1 main transformer medium voltage side is 180 degrees, phase B is 60 degrees, and phase C is-60 degrees; the A phase of the #2 main transformer medium voltage side is 0 degree, the B phase is-120 degrees, the C phase is 120 degrees, and because the bus points to the main transformer to be positive direction, the CT secondary circuit and the transformation ratio of the 110kV intelligent substation medium voltage side are correct, and the relation between the polarity and the phase is correct.
An analog quantity relay protection tester is adopted to lead the current quantities of phase A15A, 0 degrees, phase B15A, -120 degrees and phase C15A, 120 degrees to the low-voltage side of the #1 main transformer in a mode of figure 25, and the current is output from the low-voltage side of the #1 main transformer hung on a low-voltage side I bus and flows out from a grounding switch on the low-voltage side of the #2 main transformer hung on a low-voltage side II bus through segmentation. Fig. 26, fig. 27, fig. 28 and fig. 29 are obtained on the fault recorder, where fig. 26 is a schematic diagram of a waveform of a protection current at a low-voltage side of a #1 main transformer, fig. 27 is a schematic diagram of a waveform of a measurement current at a low-voltage side of a #1 main transformer, fig. 28 is a schematic diagram of a waveform of a protection current at a low-voltage side of a #2 main transformer, and fig. 29 is a schematic diagram of a waveform of a measurement current at a low-voltage side of a #2 main transformer. According to the data of the waveform schematic diagram, the three-phase current magnitude can be calculated to be 15A according to the transformation ratio. Phase A of the low-voltage side of the main transformer of #1 is 180 degrees, phase B is 60 degrees, and phase C is-60 degrees; the A phase of the #2 main transformer low-voltage side is 0 degree, the B phase is-120 degrees, the C phase is 120 degrees, and because the bus points to the main transformer to be positive direction, the CT secondary circuit and the transformation ratio of the 110kV intelligent substation low-voltage side are correct, and the relation between the polarity and the phase is correct.
In conclusion, the primary simulation live-line test system provided by the invention can realize the verification of sampling correctness of the total station IED sampling device, the verification of correctness of secondary loops PT and CT and the analysis of voltage-current three-phase relation under the conditions of time saving, labor saving and equipment saving, and fills the gap that a single-phase voltage-regulating current-increasing method cannot check the relation of three-phase current and voltage phase in real time. And by adopting a single-phase voltage-regulating current-rising method, 6 debugging personnel are needed for completing the test, the time is consumed for 3 days, the weight of test equipment is heavy, and the test equipment needs to be transported by a truck. By using the one-time simulation live test system provided by the invention, only 4 debuggers are needed to complete the test, the time consumption is only 1 day, the weight of the test equipment is small, and the test equipment can be transported by a common vehicle. The test system provided by the invention shortens the test time, reduces the safety risk, saves the test cost and has strong operability.
Referring to fig. 30, fig. 30 is a flowchart illustrating a primary simulated live test method of an intelligent substation according to an embodiment of the present invention; the specific operation steps are as follows:
step S301: the maintenance power box is utilized to simultaneously boost the three phases of each voltage class side of the intelligent substation;
step S302: verifying the correctness of the PT secondary circuits at each voltage class side and the phase relation of the three-phase voltage according to the equipment sampling value of the intelligent substation IED equipment under the minimum precision;
step S303: utilizing a relay protection tester to simultaneously flow up the three phases at each voltage class side;
step S304: and verifying the correctness of the CT secondary circuits at each voltage class side and the phase relation of the three-phase current according to the equipment sampling value of the intelligent substation IED equipment under the minimum precision.
The primary simulation live test method of the intelligent substation provided by the embodiment of the invention is applied to the primary simulation live test system of the intelligent substation provided by the embodiment; the method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
The primary simulation live-line test system and method of the intelligent substation provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides an intelligent substation's electrified test system of once simulation which characterized in that includes:
the intelligent substation intelligent monitoring system comprises a maintenance power box serving as a voltage source, a relay protection tester serving as a current source and intelligent substation IED equipment;
the maintenance power box is used for simultaneously boosting three phases of each voltage class side of the intelligent substation;
the relay protection tester is used for respectively and simultaneously carrying out current rise on the three phases at each voltage class side;
the intelligent substation IED equipment is used for verifying the correctness of the PT and CT secondary circuits on each voltage class side and the correctness of the relation between the three-phase voltage and the current phase according to the equipment sampling value under the minimum precision.
2. The primary simulated live test system of claim 1, wherein the service power box is specifically configured to:
after a pre-selection isolating switch and a pre-selection disconnecting link on the high-voltage side of the intelligent substation are closed, boosting the voltage of a high-voltage side bus in the same phase A, phase B and phase C;
after a pre-selection isolating switch and a pre-selection disconnecting link on the medium-voltage side of the intelligent substation are closed, boosting the voltage of a medium-voltage side bus when the phases A, B and C are the same;
and after the pre-selection isolating switch and the pre-selection disconnecting link on the low-voltage side of the intelligent substation are closed, boosting the voltage of the low-voltage side bus when the phases A, B and C are the same.
3. The primary simulation live test system according to claim 1, wherein the relay protection tester is specifically configured to:
when the phases A, B and C of the preset loop at the high-voltage side are the same, current is introduced so that the current is output from the line 1 hung on the high-voltage side I bus and flows out from the grounding disconnecting link of the line 2 hung on the high-voltage side II bus through the bus coupler;
when the phases A, B and C of the preset loop at the medium voltage side are the same, current is introduced so that the current is output from the medium voltage side of a first main transformer hung on a medium voltage side I bus and flows out from a medium voltage side earthing switch of a second main transformer hung on a medium voltage side II bus through segmentation;
and when the phases A, B and C of the preset loop at the low-voltage side are the same, current is introduced so that the current is output from the low-voltage side of a first main transformer hung on a low-voltage side I bus and flows out from a low-voltage side grounding knife switch of a second main transformer hung on a low-voltage side II bus through segmentation.
4. The primary simulated live test system of claim 1, wherein the intelligent substation IED device comprises: the control system comprises a control cubicle, a protection device, a measurement and control device, a network distribution device, a fault recording device, an electric meter and an electric energy sampling device.
5. The primary simulated live test system of claim 4, wherein the intelligent substation IED device is further configured to: verifying the correctness of the sampling value of the sampling terminal of the control cubicle, the sampling value of the protection device, the sampling value of the measurement and control device, the sampling value of the network distribution device, the sampling value of the fault recording device, the sampling value of the electric meter and the sampling value of the electric energy sampling device.
6. The primary simulated live test system of claim 4, wherein the fault recording device is configured to:
and verifying the correctness of the PT transformation ratio, the CT transformation ratio and the CT polarity on each voltage grade side and the relation between the three-phase voltage and the current phase according to the recorded data of the waveform schematic diagram.
7. The primary simulated charge test system of claim 1 further comprising: and the universal meter is used for measuring the voltage value of the intelligent substation voltage secondary circuit so as to verify the correctness of the PT secondary circuits on the voltage class sides.
8. The primary simulated charge test system of claim 1 further comprising: and the alternating current clamp ammeter is used for measuring the current value of the current secondary circuit of the intelligent substation so as to verify the correctness of the CT secondary circuit at each voltage class side.
9. The primary simulated charge test system of claim 1 further comprising: the air switch with the leakage protection function is used for protecting a test power line.
10. A primary simulation live test method for an intelligent substation is characterized by comprising the following steps:
the maintenance power box is utilized to simultaneously boost the three phases of each voltage class side of the intelligent substation;
verifying the correctness of the PT secondary circuits at each voltage class side and the phase relation of the three-phase voltage according to the equipment sampling value of the intelligent substation IED equipment under the minimum precision;
utilizing a relay protection tester to simultaneously flow up the three phases at each voltage class side;
and verifying the correctness of the CT secondary circuits at each voltage class side and the phase relation of the three-phase current according to the equipment sampling value of the intelligent substation IED equipment under the minimum precision.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117031171A (en) * | 2023-08-26 | 2023-11-10 | 国家电网有限公司 | Method for simulating polarity test of relay protection equipment without actual load |
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| CN101769980A (en) * | 2008-12-31 | 2010-07-07 | 新疆维吾尔自治区送变电工程公司 | Testing method simulating power transmission debugging |
| CN106093637A (en) * | 2016-06-07 | 2016-11-09 | 国网四川省电力公司电力科学研究院 | The removing method of dead band defect between intelligent substation primary equipment and secondary device |
| CN110824385A (en) * | 2019-11-22 | 2020-02-21 | 国网福建省电力有限公司 | Transformer system current phasor testing system and method based on low-frequency excitation response |
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| CN106093637A (en) * | 2016-06-07 | 2016-11-09 | 国网四川省电力公司电力科学研究院 | The removing method of dead band defect between intelligent substation primary equipment and secondary device |
| CN110824385A (en) * | 2019-11-22 | 2020-02-21 | 国网福建省电力有限公司 | Transformer system current phasor testing system and method based on low-frequency excitation response |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117031171A (en) * | 2023-08-26 | 2023-11-10 | 国家电网有限公司 | Method for simulating polarity test of relay protection equipment without actual load |
| CN117031171B (en) * | 2023-08-26 | 2024-04-19 | 国家电网有限公司 | Method for simulating polarity test of relay protection equipment without actual load |
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