CN113552519A - Method and device for testing performance of casing monitoring system - Google Patents
Method and device for testing performance of casing monitoring system Download PDFInfo
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- CN113552519A CN113552519A CN202110638083.7A CN202110638083A CN113552519A CN 113552519 A CN113552519 A CN 113552519A CN 202110638083 A CN202110638083 A CN 202110638083A CN 113552519 A CN113552519 A CN 113552519A
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- 238000012360 testing method Methods 0.000 title claims abstract description 30
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Abstract
The invention provides a device and a method for testing the performance of a converter transformer valve side sleeve monitoring system, which comprises the following steps: the power supply is connected with the first three-phase transformer and the second three-phase transformer; the output ends of the 3 single-phase transformers of the first three-phase transformer are connected with a first rectifier bridge, and the output ends of the 3 single-phase transformers of the second three-phase transformer are connected with a second rectifier bridge; the converter transformer valve side sleeve simulation units are in multiple groups and are respectively arranged between the secondary output ends of the 6 single-phase transformers and the ground potential; the low-voltage end of the first rectifier bridge is connected with the ground, and the high-voltage end of the first rectifier bridge is connected with the low-voltage end of the second rectifier bridge; the high-voltage end of the second rectifier bridge is connected with the protection unit; the filtering unit is connected with the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge; the load is connected with the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge; the rectifying unit control system is connected with each rectifying element in the first rectifying bridge and the second rectifying bridge.
Description
Technical Field
The invention relates to the technical field of capacitive equipment online monitoring, in particular to a method and a device for testing the performance of a converter transformer valve side sleeve monitoring system.
Background
The converter transformer valve side sleeve is key equipment and components of a converter station and a converter transformer and plays roles in conductive connection, insulation isolation and mechanical connection. The valve side sleeve of the converter transformer is a necessary channel for electric energy transmission of the converter station, and the performance index and the operation reliability of the valve side sleeve are related to the safety of the whole direct current system. At present, the faults of imported or domestic AC/DC bushings are frequent, the bushings are damaged if the faults are frequent, and the bushings are exploded and damage a transformer if the faults are serious, so that power failure of a power grid is caused, the safe operation of the power grid is seriously influenced, and huge economic loss and social influence are caused. According to incomplete statistics, 94 cases of defects are commonly found in the sleeve of the converter station between 2007 and 2017 of national grid companies, the main defect types comprise internal discharge, current-carrying connecting part overheating, poor sealing, capacitor core cracking and the like, and finally, insulation failure is shown to cause the main equipment to be forced to stop operation. And the related faults of the sleeve often have the characteristics of slow development but sudden outbreak, and the timely problems can be found only by monitoring the running state of the sleeve on line in real time. However, in the prior art, the online monitoring means for the converter transformer valve side sleeve is very limited, and only two modes of sleeve internal gas pressure monitoring and converter transformer valve side sleeve end screen voltage divider voltage monitoring are provided, and the two modes are not sensitive enough to the response of the converter transformer valve side sleeve at the initial stage of the fault. The dielectric loss factor and the capacitance are key parameters of the power equipment, and the on-line monitoring of the dielectric loss factor and the capacitance is applied to other capacitive power equipment in engineering. However, due to the existence of various special factors such as voltage and current waveforms borne by the converter transformer bushing containing direct current components and harmonic components, different voltage waveforms borne by different bushings, voltage reference signals of a voltage-free transformer and the like, the traditional device and method for monitoring the dielectric loss factor and the capacitance are not suitable for the valve side bushing of the converter transformer, and in addition, the prior art (application number: 2020115432200) provides a method and a system for online monitoring of parameters of the valve side bushing of the converter transformer, so that the problem of the online monitoring device is basically solved, but a test system for testing the performance of the valve side bushing online monitoring device is still in a blank state.
Therefore, a technology for performing a performance test on the converter transformer valve side bushing insulation performance monitoring system is needed.
Disclosure of Invention
The technical scheme of the invention provides a device and a method for testing the performance of a converter transformer valve side sleeve monitoring system, which aim to solve the problem of how to test the performance of the converter transformer valve side sleeve insulation performance monitoring system.
In order to solve the above problems, the present invention provides an apparatus for testing performance of a converter transformer valve side bushing monitoring system, the apparatus comprising: the system comprises a power supply, a first three-phase transformer, a second three-phase transformer, a converter transformer valve side sleeve simulation unit, a first rectifier bridge, a second rectifier bridge, a protection unit, a filtering unit, a load and a rectifier unit control system; wherein the first three-phase transformer and the second three-phase transformer each comprise 3 single-phase transformers;
the power supply is connected with the first three-phase transformer and the second three-phase transformer and supplies power to 6 single-phase transformers;
the output ends of the 3 single-phase transformers of the first three-phase transformer are connected with the first rectifier bridge, and the output ends of the 3 single-phase transformers of the second three-phase transformer are connected with the second rectifier bridge;
the converter transformer valve side sleeve simulation units are in multiple groups and are respectively arranged between the secondary output ends of the 6 single-phase transformers and the ground potential; the converter transformer valve side sleeve simulation unit is used for outputting a voltage signal and a current signal;
the low-voltage end of the first rectifier bridge is connected with the ground, and the high-voltage end of the first rectifier bridge is connected with the low-voltage end of the second rectifier bridge;
the high-voltage end of the second rectifier bridge is connected with the protection unit, and the protection unit is connected with the load in series to form an output loop;
the filtering unit is connected to the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge;
the load is connected with the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge; the filtering unit is connected with the load in parallel;
the rectifying unit control system is connected to each rectifying element in the first rectifying bridge and the second rectifying bridge and controls the working state of each rectifying element.
Preferably, the power supply comprises an A phase, a B phase, a C phase and a zero line, the frequency is 50Hz, the voltage amplitude is 380V-400V, and the phase angles are sequentially different by 120 +/-0.001 degrees.
Preferably, the connection mode of the 3 single-phase transformers of the first three-phase transformer is YNd;
the connection mode of the 3 single-phase transformers of the second three-phase transformer is YNy.
Preferably, the converter transformer valve side sleeve simulation units are 12 groups.
Preferably, the converter transformer valve side bushing simulation unit includes: the device comprises a converter transformer valve side sleeve main insulation simulation module, a converter transformer valve side sleeve end screen voltage divider simulation module and a current transformer;
the main insulation simulation module of the converter transformer valve side sleeve comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel;
the converter transformer valve side sleeve tap voltage divider simulation module comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel and used for outputting a voltage signal;
the current transformer is used for outputting a current signal.
Preferably, the first rectifier bridge comprises 6 rectifier elements, and forms a three-phase fully-controlled bridge rectifier circuit;
the second rectifier bridge comprises 6 rectifier elements to form a three-phase fully-controlled bridge rectifier circuit;
the rectifying element is a thyristor or an IGBT.
Preferably, the filtering unit includes a capacitor and a resistor, and the capacitor and the resistor are connected in series or in parallel for filtering harmonic components.
Preferably, the resistance of the load is adjustable.
Based on another aspect of the invention, the invention provides a method for testing the performance of a converter transformer valve side sleeve monitoring system, which comprises the following steps:
connecting a power supply to a first three-phase transformer and a second three-phase transformer, wherein the first three-phase transformer and the second three-phase transformer respectively comprise 3 single-phase transformers, and 6 single-phase transformers are supplied with power through the power supply;
connecting the output ends of the 3 single-phase transformers of the first three-phase transformer with the first rectifier bridge, and connecting the output ends of the 3 single-phase transformers of the second three-phase transformer with the second rectifier bridge;
respectively arranging a plurality of groups of converter transformer valve side sleeve simulation units between secondary output ends of 6 single-phase transformers and ground potential; the converter transformer valve side sleeve simulation unit is used for outputting a voltage signal and a current signal;
connecting a low-voltage end of a first rectifier bridge with the ground, and connecting a high-voltage end of the first rectifier bridge with a low-voltage end of a second rectifier bridge;
connecting a high-voltage end of a second rectifier bridge with the protection unit, and connecting the protection unit and the load in series to form an output loop;
connecting a filtering unit to a low voltage end of the first rectifier bridge and a high voltage end of the second rectifier bridge;
connecting a load to a low voltage end of the first rectifier bridge and a high voltage end of the second rectifier bridge; connecting a filtering unit with the load in parallel;
and connecting a rectifying unit control system to each rectifying element in the first rectifying bridge and the second rectifying bridge, and controlling the working state of each rectifying element.
The technical scheme of the invention provides a device for testing the performance of a transformer valve side sleeve monitoring system, which can simulate the operation condition of a transformer valve side sleeve and can generate end screen voltage and end screen leakage current signals with the same actual condition for testing the performance of an on-line monitoring device.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a block diagram of an apparatus for testing performance of a converter transformer valve side bushing monitoring system according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a converter transformer valve side bushing simulation unit according to a preferred embodiment of the present invention;
fig. 3 is a flow chart of a method for testing the performance of a converter transformer valve side bushing monitoring system according to a preferred embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a structural diagram of an apparatus for testing the performance of a converter transformer valve side bushing monitoring system according to a preferred embodiment of the present invention. The invention provides a device for testing the performance of a converter transformer valve side sleeve medium loss factor and capacitance system, which can simulate the operation conditions of 12 converter transformer valve side sleeves in the same polarity and same valve hall (namely a group of 12 pulse rectifiers), can generate end screen voltage and end screen leakage current signals with the same actual condition, and is used for testing the performance of an on-line monitoring system.
As shown in fig. 1, the present invention provides an apparatus for testing performance of a converter transformer valve side bushing monitoring system, the apparatus comprising: the system comprises a power supply, a first three-phase transformer, a second three-phase transformer, a converter transformer valve side sleeve simulation unit, a first rectifier bridge, a second rectifier bridge, a protection unit, a filtering unit, a load and a rectifier unit control system; the first three-phase transformer and the second three-phase transformer respectively comprise 3 single-phase transformers;
the invention provides a device for testing the performance of a converter transformer valve side sleeve monitoring system, which mainly comprises a power supply, 6 single-phase transformers, a converter transformer valve side sleeve simulation unit, a first rectifier bridge, a second rectifier bridge, a protection unit, a filtering unit, a load and a rectifier unit control system.
The power supply is connected with the first three-phase transformer and the second three-phase transformer and supplies power for the 6 single-phase transformers; preferably, the power supply comprises an A phase, a B phase, a C phase and a zero line, the frequency is 50Hz, the voltage amplitude is 380V-400V and is constant, and the phase angles are sequentially different by 120 +/-0.001 degrees.
The apparatus of the present invention comprises a power supply comprising: A. b, C three phases and zero lines, and the frequency is 50Hz, the effective value is the same (the recommended voltage amplitude is 380V-400V), the phase angle is 120 degrees +/-0.001 degrees.
The output ends of the 3 single-phase transformers of the first three-phase transformer are connected with a first rectifier bridge, and the output ends of the 3 single-phase transformers of the second three-phase transformer are connected with a second rectifier bridge;
preferably, the connection mode of 3 single-phase transformers of the first three-phase transformer is YNd, and primary windings of the 3 single-phase transformers form star connection;
the connection mode of 3 single-phase transformers of the second three-phase transformer is YNy, and the primary windings of the 3 single-phase transformers form star connection.
The device comprises 6 single-phase transformers, wherein each single-phase transformer has an adjustable voltage amplitude and is respectively numbered YNDA, YNDB, YNDC, YNyA, YNyB and YNyC.
The three single-phase transformers YNDA, YNDB and YNDC form a group of three-phase transformers, the connection mode is YNd, primary windings of the 3 single-phase transformers form star connection, three outgoing lines are respectively connected with A, B, C three phases of a power supply, and a primary neutral point is connected with a power supply zero line N; the secondary winding is connected in a triangular mode, and the three outgoing lines are connected with the first rectifier bridge.
The three single-phase transformers YNyA, YNyB and YNyC form a group of three-phase transformers, the connection mode is YNy, primary windings of the 3 single-phase transformers form star connection, three outgoing lines are respectively connected with A, B, C three phases of a power supply, and a primary neutral point is connected with a power supply zero line N; the primary winding forms star connection, the three outgoing lines are connected through a second rectifier bridge, and the neutral point of the secondary side is not connected with other zero lines or the ground.
The converter transformer valve side sleeve simulation units are in multiple groups and are respectively arranged between the secondary output ends of the 6 single-phase transformers and the ground potential; the converter transformer valve side sleeve simulation unit is used for outputting a voltage signal and a current signal; preferably, the simulation units of the converter transformer valve side sleeve are 12 groups.
Preferably, the converter transformer valve side bushing simulation unit includes: the device comprises a converter transformer valve side sleeve main insulation simulation module, a converter transformer valve side sleeve end screen voltage divider simulation module and a current transformer;
the main insulation simulation module of the converter transformer valve side sleeve comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel;
the converter transformer valve side sleeve end screen voltage divider simulation module comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel and used for outputting a voltage signal;
the current transformer is used for outputting a current signal.
The converter transformer valve side sleeve simulation unit provided by the invention comprises 12 groups, is positioned between a single-phase transformer and a first rectifier bridge and a second rectifier bridge, and is connected between 12 leading-out wires of secondary sides of 6 single-phase transformers YNDA, YNDB, YNDC, YNyA, YNyB and YNyC and the ground.
The converter transformer valve side sleeve simulation unit comprises: the device comprises a converter transformer valve side sleeve main insulation simulation module, a converter transformer valve side sleeve end screen voltage divider simulation module and a current transformer. The main insulation simulation unit of the converter transformer valve side sleeve is formed by connecting a capacitor and a resistor in series or in parallel; the converter transformer valve side sleeve end screen voltage divider simulation unit is formed by connecting capacitors and resistors in series or in parallel, and can output voltage signals which are consistent with voltage waveforms generated under actual operation conditions and used for performance test of an on-line monitoring device. The current transformer can output current signals for the performance test of the on-line monitoring device.
The low-voltage end of the first rectifier bridge is connected with the ground, and the high-voltage end of the first rectifier bridge is connected with the low-voltage end of the second rectifier bridge;
the high-voltage end of the second rectifier bridge is connected with the protection unit, and the protection unit is connected with the load in series to form an output loop;
the protection unit is used for protecting the test system and preventing the damage of each component unit of the test system caused by faults such as overlarge current and the like.
Preferably, the first rectifier bridge comprises 6 rectifier elements, and forms a three-phase fully-controlled bridge rectifier circuit; the second rectifier bridge comprises 6 rectifier elements and forms a three-phase fully-controlled bridge rectifier circuit; the rectifying element is a thyristor or an IGBT.
The first rectifier bridge of the invention comprises 6 rectifier elements which form a three-phase fully-controlled bridge rectifier circuit, wherein the rectifier elements are preferably thyristors, IGBTs and the like. The low-voltage end of the first rectifier bridge is connected with the ground, and the high-voltage end of the first rectifier bridge is connected with the low-voltage end of the second rectifier bridge.
The second rectifier bridge of the invention comprises 6 rectifier elements which form a three-phase fully-controlled bridge rectifier circuit, wherein the rectifier elements are preferably thyristors, IGBTs and the like. The high-voltage end of the second rectifier bridge is connected with the protection unit.
The filtering unit is connected to the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge; preferably, the filtering unit includes a capacitor and a resistor, and the capacitor and the resistor are connected in series or in parallel for filtering the harmonic component.
The filtering unit is connected to the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge, is composed of capacitors and is used for filtering harmonic components.
The load is connected with the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge; the filtering unit is connected with the load in parallel; preferably, the resistance of the load is adjustable.
The load is connected to the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge, and the resistance value of the load is adjustable.
The rectifying unit control system is connected with each rectifying element in the first rectifying bridge and the second rectifying bridge and controls the working state of each rectifying element.
The rectifying unit control system is respectively connected with all rectifying elements in the first rectifying bridge and the second rectifying bridge, controls the on and off working states of the rectifying elements and the like, and can adjust the trigger angle according to the requirement.
The invention supplies power for 6 single-phase transformers by a power supply; the 6 single-phase transformers are divided into 2 groups, each 3 single-phase transformers form a group of three-phase transformers, and then the output ends of the two groups of transformers are respectively connected with the first rectifier bridge and the second rectifier bridge. The rectifier bridge converts the voltage waveform from alternating current 50Hz to direct current voltage, the tail end of the first rectifier bridge is used as a low-voltage end of the direct current voltage, the low-voltage end of the first rectifier bridge is connected with the ground potential, and the tail end of the second rectifier bridge is used as a high-voltage end of the direct current voltage. And then, the protection unit and the load are connected in series to form an output loop, wherein the protection unit is used as an output protection element to prevent faults such as overcurrent and the like, the load is used for simulating an actual load, and the circuit of the output loop is controlled by adjusting the amplitude of the load. The filtering unit is connected with the parallel load and used for filtering the higher harmonics of the voltage waveform. The converter transformer valve side sleeve simulation unit is positioned between the secondary output end of the single-phase transformer and the ground potential, is used for simulating an actual converter transformer valve side sleeve, and the converter transformer valve side sleeve end screen voltage divider simulation module can output voltage and current signals and is used for testing the performance test of the on-line monitoring device.
The invention provides a device for testing the performance of a converter transformer valve side sleeve medium loss factor and capacitance system, which can simulate the operation conditions of 12 converter transformer valve side sleeves in the same polarity and same valve hall (namely a group of 12 pulse rectifiers), can generate end screen voltage and end screen leakage current signals with the same actual condition, and is used for testing the performance of an on-line monitoring system.
Fig. 3 is a flow chart of a method for testing the performance of a converter transformer valve side bushing monitoring system according to a preferred embodiment of the invention. As shown in fig. 3, the present invention provides a method for testing performance of a converter transformer valve side bushing monitoring system, the method comprising:
step 301: connecting a power supply to a first three-phase transformer and a second three-phase transformer, wherein the first three-phase transformer and the second three-phase transformer respectively comprise 3 single-phase transformers, and 6 single-phase transformers are supplied with power through the power supply; preferably, the power supply comprises an A phase, a B phase, a C phase and a zero line, the frequency is 50Hz, the voltage amplitude is 380V-400V and is constant, and the phase angles are sequentially different by 120 +/-0.001 degrees.
Step 302: the output ends of the 3 single-phase transformers of the first three-phase transformer are connected with the first rectifier bridge, and the output ends of the 3 single-phase transformers of the second three-phase transformer are connected with the second rectifier bridge. Preferably, the connection mode of 3 single-phase transformers of the first three-phase transformer is YNd, and primary windings of the 3 single-phase transformers form star connection; the connection mode of 3 single-phase transformers of the second three-phase transformer is YNy, and the primary windings of the 3 single-phase transformers form star connection.
Step 303: respectively arranging a plurality of groups of converter transformer valve side sleeve simulation units between secondary output ends of 6 single-phase transformers and ground potential; the converter transformer valve side sleeve simulation unit is used for outputting a voltage signal and a current signal. Preferably, the simulation units of the converter transformer valve side sleeve are 12 groups.
Preferably, the flow transformer valve side bushing simulation unit includes: the device comprises a converter transformer valve side sleeve main insulation simulation module, a converter transformer valve side sleeve end screen voltage divider simulation module and a current transformer; the main insulation simulation module of the converter transformer valve side sleeve comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel; the converter transformer valve side sleeve end screen voltage divider simulation module comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel and used for outputting a voltage signal; the current transformer is used for outputting a current signal.
Step 304: connecting the low-voltage end of the first rectifier bridge with the ground, and connecting the high-voltage end of the first rectifier bridge with the low-voltage end of the second rectifier bridge;
step 305: connecting the high-voltage end of the second rectifier bridge with a protection unit, and connecting the protection unit with a load in series to form an output loop;
preferably, the first rectifier bridge comprises 6 rectifier elements, and forms a three-phase fully-controlled bridge rectifier circuit; the second rectifier bridge comprises 6 rectifier elements and forms a three-phase fully-controlled bridge rectifier circuit; the rectifying element is a thyristor or an IGBT.
Step 306: connecting a filtering unit to a low voltage end of the first rectifier bridge and a high voltage end of the second rectifier bridge; preferably, the filtering unit includes a capacitor and a resistor, and the capacitor and the resistor are connected in series or in association for filtering the harmonic component.
Step 307: connecting a load to a low voltage end of the first rectifier bridge and a high voltage end of the second rectifier bridge; connecting the filtering unit with a load in parallel; preferably, the resistance of the load is adjustable.
Step 308: and connecting the rectifying unit control system to each rectifying element in the first rectifying bridge and the second rectifying bridge, and controlling the working state of each rectifying element.
A method 300 for testing performance of a converter transformer valve side sleeve monitoring system according to a preferred embodiment of the present invention corresponds to the system 100 for testing performance of a converter transformer valve side sleeve monitoring system according to another preferred embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (9)
1. An apparatus for converter transformer valve side casing monitoring system performance testing, the apparatus comprising: the system comprises a power supply, a first three-phase transformer, a second three-phase transformer, a converter transformer valve side sleeve simulation unit, a first rectifier bridge, a second rectifier bridge, a protection unit, a filtering unit, a load and a rectifier unit control system; wherein the first three-phase transformer and the second three-phase transformer each comprise 3 single-phase transformers;
the power supply is connected with the first three-phase transformer and the second three-phase transformer and supplies power to 6 single-phase transformers;
the output ends of the 3 single-phase transformers of the first three-phase transformer are connected with the first rectifier bridge, and the output ends of the 3 single-phase transformers of the second three-phase transformer are connected with the second rectifier bridge;
the converter transformer valve side sleeve simulation units are in multiple groups and are respectively arranged between the secondary output ends of the 6 single-phase transformers and the ground potential; the converter transformer valve side sleeve simulation unit is used for outputting a voltage signal and a current signal;
the low-voltage end of the first rectifier bridge is connected with the ground, and the high-voltage end of the first rectifier bridge is connected with the low-voltage end of the second rectifier bridge;
the high-voltage end of the second rectifier bridge is connected with the protection unit, and the protection unit is connected with the load in series to form an output loop;
the filtering unit is connected to the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge;
the load is connected with the low-voltage end of the first rectifier bridge and the high-voltage end of the second rectifier bridge; the filtering unit is connected with the load in parallel;
the rectifying unit control system is connected to each rectifying element in the first rectifying bridge and the second rectifying bridge and controls the working state of each rectifying element.
2. The apparatus of claim 1, wherein the power supply comprises a phase A, a phase B, a phase C and a neutral line, the frequency is 50Hz, the voltage amplitude is 380V-400V, and the phase angles are sequentially different by 120 ° ± 0.001 °.
3. The apparatus of claim 1, wherein the first three-phase transformer has 3 single-phase transformers connected in YNd;
the connection mode of the 3 single-phase transformers of the second three-phase transformer is YNy.
4. The apparatus of claim 1, said converter transformer valve side bushing simulation units being 12 sets.
5. The apparatus of claim 1, said converter transformer valve side bushing simulation unit comprising: the device comprises a converter transformer valve side sleeve main insulation simulation module, a converter transformer valve side sleeve end screen voltage divider simulation module and a current transformer;
the main insulation simulation module of the converter transformer valve side sleeve comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel;
the converter transformer valve side sleeve tap voltage divider simulation module comprises a capacitor and a resistor, wherein the capacitor and the resistor are connected in series or in parallel and used for outputting a voltage signal;
the current transformer is used for outputting a current signal.
6. The apparatus of claim 1, the first rectifier bridge comprising 6 rectifier elements forming a three-phase fully controlled bridge rectifier circuit;
the second rectifier bridge comprises 6 rectifier elements to form a three-phase fully-controlled bridge rectifier circuit;
the rectifying element is a thyristor or an IGBT.
7. The apparatus of claim 1, the filtering unit comprising a capacitor and a resistor, the capacitor and the resistor being connected in series or in parallel for filtering harmonic components.
8. The apparatus of claim 1, the resistance of the load being adjustable.
9. A method for converter transformer valve side casing monitoring system performance testing, the method comprising:
connecting a power supply to a first three-phase transformer and a second three-phase transformer, wherein the first three-phase transformer and the second three-phase transformer respectively comprise 3 single-phase transformers, and 6 single-phase transformers are supplied with power through the power supply;
connecting the output ends of the 3 single-phase transformers of the first three-phase transformer with the first rectifier bridge, and connecting the output ends of the 3 single-phase transformers of the second three-phase transformer with the second rectifier bridge;
respectively arranging a plurality of groups of converter transformer valve side sleeve simulation units between secondary output ends of 6 single-phase transformers and ground potential; the converter transformer valve side sleeve simulation unit is used for outputting a voltage signal and a current signal;
connecting a low-voltage end of a first rectifier bridge with the ground, and connecting a high-voltage end of the first rectifier bridge with a low-voltage end of a second rectifier bridge;
connecting a high-voltage end of a second rectifier bridge with the protection unit, and connecting the protection unit and the load in series to form an output loop;
connecting a filtering unit to a low voltage end of the first rectifier bridge and a high voltage end of the second rectifier bridge;
connecting a load to a low voltage end of the first rectifier bridge and a high voltage end of the second rectifier bridge; connecting a filtering unit with the load in parallel;
and connecting a rectifying unit control system to each rectifying element in the first rectifying bridge and the second rectifying bridge, and controlling the working state of each rectifying element.
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| CN202110638083.7A CN113552519A (en) | 2021-06-08 | 2021-06-08 | Method and device for testing performance of casing monitoring system |
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| CN202110638083.7A CN113552519A (en) | 2021-06-08 | 2021-06-08 | Method and device for testing performance of casing monitoring system |
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