CN112924830A - Transformer three-phase partial discharge simultaneous pressurization test device and test method based on single-phase variable frequency power supply - Google Patents
Transformer three-phase partial discharge simultaneous pressurization test device and test method based on single-phase variable frequency power supply Download PDFInfo
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Abstract
The invention relates to the technical field of high-voltage tests of electrical equipment, in particular to a device and a method for testing three-phase partial discharge and simultaneous pressurization of a transformer based on a single-phase variable-frequency power supply; the technical scheme is as follows: the digital phase shifter comprises a 380V power supply system, a single-phase variable frequency power supply with adjustable frequency, a digital phase shifter, an exciting transformer, a triangular connection parallel controllable reactor group and a tested transformer, wherein the 380V power supply system is connected with an input end of the single-phase variable frequency power supply with adjustable frequency, the three-phase power supply is changed into the single-phase variable frequency power supply with adjustable frequency, after an output end of the single-phase variable frequency power supply with adjustable frequency is connected with an input end of the digital phase shifter, an output end of the digital phase shifter is connected with a primary side of the exciting transformer, one end of a secondary side of the exciting transformer is grounded, the other end of the secondary side of the exciting transformer is connected with the triangular connection parallel controllable reactor group, the triangular connection parallel controllable reactor group is provided.
Description
Technical Field
The invention relates to the technical field of high-voltage tests of electrical equipment, in particular to a three-phase partial discharge simultaneous pressurization test device and a test method of a transformer based on a single-phase variable frequency power supply.
Background
The transformer partial discharge test is the most effective handover test of the transformer, and the problems of the manufacturing quality and the installation process of the transformer can be effectively found through the partial discharge test; in the past, the test standard aims at three-phase transformers in the same body, and partial discharge tests can be carried out by adopting single-phase variable-frequency power supplies phase by phase, so that each operation and maintenance unit is provided with a single-phase variable-frequency power supply box single-phase excitation transformer in a transformer substation field handover test.
With the popularization of international standards in recent years, partial units require that the test is carried out by simultaneously pressurizing the three-phase partial discharge of the three-phase transformer in the same body, for a transformer manufacturing factory, a generator is arranged in the factory, the power supply capacity is approximately infinite, the three-phase partial discharge and simultaneous pressurization test can be met, and the existing single-phase variable frequency power supply and single-phase transformer cannot meet the simultaneous pressurization test of the three-phase transformer in the same body due to the problems of transportation environment and power supply capacity on a transfer test site; in addition, the cost of the existing three-phase variable frequency power supply is high, the size is large, the transportation and the use are extremely inconvenient, and the requirements of a transformer substation field handover test are difficult to meet.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a transformer three-phase partial discharge simultaneous pressurization test device and a test method based on a single-phase variable frequency power supply.
In order to solve the technical problems, the invention adopts the technical scheme that:
the general idea of the invention is as follows: the testing device and the testing method are developed based on the single-phase variable frequency power supply, the single-phase variable frequency power supply and the single-phase transformer which are configured in the prior art of each operation and maintenance unit are still not needed to be newly purchased, and for the problem that three-phase voltage waveforms of a three-phase transformer in the same body are 120 degrees different when the three phases are simultaneously pressurized, a digital phase shifter can be used for completing phase shifting of two-phase waveforms, so that the three-phase power supply waveform can be simulated on the tested transformer; in addition, when three phases of the transformer with the same body are simultaneously pressurized, if the capacitance of the tested transformer is not compensated, the loop test current is overlarge, so that the selection of a three-phase power supply is difficult, and therefore a compensation loop formed by three-phase reactors needs to be designed to offset the capacitance of the tested transformer, so that the whole loop is in a resistive state, the test current is only resistance current, and the three-phase partial discharge and simultaneous pressurization test of the three-phase transformer is conveniently carried out.
A transformer three-phase partial discharge simultaneous pressurization test device based on a single-phase variable frequency power supply comprises a 380V power supply system, the single-phase variable frequency power supply capable of changing the three-phase power supply into a frequency-adjustable single-phase variable frequency power supply, a digital phase shifter, an excitation transformer, a triangular connection parallel controllable reactor group and a tested transformer, wherein the single-phase variable frequency power supply comprises three first, second and third parallel single-phase variable frequency power supplies, the 380V power supply system is connected with the input ends of the first, second and third single-phase variable frequency power supplies through a first high-voltage cable, the digital phase shifter comprises a first digital phase shifter and a second digital phase shifter, the input end of the first digital phase shifter is connected with the output end of the first single-phase variable frequency power supply through a second high-voltage cable, and the input end of the second digital phase shifter is connected with the output end of the third single-phase variable frequency power supply through a second high-voltage cable, the excitation transformer is provided with three excitation transformers in parallel, the three excitation transformers are respectively a first excitation transformer, a second excitation transformer and a third excitation transformer, the primary side of the first excitation transformer is connected with the output end of a first digital phase shifter, the primary side of the third excitation transformer is connected with the output end of a second digital phase shifter, the primary side of the second excitation transformer is connected with the output end of a second single-phase variable frequency power supply, one ends of the secondary sides of the first excitation transformer, the second excitation transformer and the third excitation transformer are grounded GND, the other ends of the secondary sides of the first excitation transformer, the second excitation transformer and the third excitation transformer are connected with a triangular connection parallel controllable reactor group through a voltage adding line A, the triangular connection parallel controllable reactor group is provided with three leading-out points, and the three leading-out points are as follows: a. and B, the three leading-out points are respectively three vertexes of the controllable reactor group connected in parallel in a delta connection mode, and the three leading-out points are respectively connected with the tested transformer through a voltage adding line B.
Preferably, the delta connection parallel controllable reactor group consists of three parallel controllable reactor monomers, and the head ends and the tail ends of the three parallel controllable reactor monomers are connected with each other.
The test method of the transformer three-phase partial discharge simultaneous pressurization test device based on the single-phase variable frequency power supply comprises the following steps:
the first step is as follows: selecting the capacity of a 380V power supply system, selecting the switching-on/off current of a 380V three-phase power supply to be 1000A for a three-winding three-phase transformer with 220kV/110kV/35kV, selecting the switching-on/off current of a 380V three-phase power supply to be 1500A for a double-winding three-phase transformer with 500kV/20kV, and selecting the switching-on/off current of a 242kV/15kV double-winding three-phase power supply to be 1800A;
the second step is that: firstly, equally dividing nine first high-voltage cables with the rated voltage of 380V and the current-carrying capacity of 3000A into three groups, wherein one end of each group of three cables is respectively connected with the output of a 380V power supply system, and the other end of each group of three cables is respectively connected with the input sides of a first single-phase variable frequency power supply, a second single-phase variable frequency power supply and a third single-phase variable frequency power supply, so that the output of the 380V power supply system is evenly distributed to the first single-phase variable frequency power supply, the second single-phase variable frequency power supply and the third;
the third step: secondly, evenly distributing six second high-voltage cables with 380V rated voltage and 2000A current-carrying capacity into three groups, wherein one end of each group of two second high-voltage cables is connected with the output sides of a first single-phase variable frequency power supply, a second single-phase variable frequency power supply and a third single-phase variable frequency power supply, the other end of the second high-voltage cable at the second single-phase variable frequency power supply is directly connected with the primary side of a second excitation transformer, the other two groups of second high-voltage cables are respectively connected with a first digital phase shifter and a second digital phase shifter, the first digital phase shifter is connected with the primary side of the first excitation transformer, the second digital phase shifter is connected with the primary side of the third excitation transformer, the first digital phase shifter defaults to move the input voltage waveform by 120 degrees, and the second digital phase shifter defaults to move;
the fourth step: the component compensation loop is used for connecting the three parallel controllable reactor monomers end to form a triangular connection parallel controllable reactor group, and selecting the inductance value of a reactor to be 1H for a 500kV transformer and the inductance value of a reactor to be 2.5H for a 220kV transformer;
the fifth step: grounding one ends of secondary sides of a first excitation transformer, a second excitation transformer and a third excitation transformer, connecting the other ends of the secondary sides of the first excitation transformer, the second excitation transformer and the third excitation transformer with a triangular connection parallel controllable reactor group through a pressurization line A, wherein the pressurization line is a sheath line with a cross section of 4 square millimeters, and three leading-out points of the triangular connection parallel controllable reactor group are connected with an input end of a low-voltage side of the tested transformer through a pressurization line B to complete the construction of a test loop;
and a sixth step: the method comprises the steps of starting a three-phase partial discharge simultaneous pressurization test of the three-phase transformer, adjusting the frequencies of a first single-phase variable frequency power supply, a second single-phase variable frequency power supply and a third single-phase variable frequency power supply to enable the whole test loop to be in a complete parallel resonance loop, enabling the frequencies of the first single-phase variable frequency power supply, the second single-phase variable frequency power supply and the third single-phase variable frequency power supply to be consistent, observing the output voltage waveforms of the first single-phase variable frequency power supply, the second single-phase variable frequency power supply and the third single-phase variable frequency power supply, and considering that the phase shift of the test loop is successful if the voltage waveforms of the first single-phase variable frequency power supply, the second single-phase variable frequency power.
Compared with the prior art, the invention has the beneficial effects that:
the invention is practical and simple, can realize the partial discharge test and the three-phase pressurization test of the three-phase transformer in the same body by modifying and assembling the existing test equipment, ensures that the test result is more accurate, solves the problem that the field handover test of the transformer substation is difficult to meet the requirement caused by the transportation environment and the power supply capacity, does not need to newly purchase a three-phase excitation transformer and a three-phase variable frequency power supply, and can save the purchase cost of instruments of hundreds of thousands of yuan.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: the transformer type transformer voltage testing device comprises a 380V power supply system 1, a delta connection parallel controllable reactor group 2, a tested transformer 3, a first single-phase variable frequency power supply 4, a second single-phase variable frequency power supply 5, a third single-phase variable frequency power supply 6, a first high-voltage cable 7, a first digital phase shifter 8, a second digital phase shifter 9, a second high-voltage cable 10, a first exciting transformer 11, a second exciting transformer 12, a third exciting transformer 13, a pressurizing line A14, a parallel controllable reactor monomer 15 and a pressurizing line B16.
Detailed Description
As shown in fig. 1, the device for testing the simultaneous pressurization of three-phase partial discharge of a transformer based on a single-phase variable frequency power supply comprises a 380V power supply system 1, a single-phase variable frequency power supply for changing the three-phase power supply into a frequency-adjustable single-phase variable frequency power supply, a digital phase shifter, an excitation transformer, a delta-connected parallel controllable reactor group 2 and a tested transformer 3, wherein the single-phase variable frequency power supply comprises three parallel first single-phase variable frequency power supplies 4, second single-phase variable frequency power supplies 5 and third single-phase variable frequency power supplies 6, the 380V power supply system 1 is connected with the input ends of the first single-phase variable frequency power supplies 4, the second single-phase variable frequency power supplies 5 and the third single-phase variable frequency power supplies 6 through a first high voltage cable 7, the digital phase shifter comprises a first digital phase shifter 8 and a second digital phase shifter 9, the input end of the first digital phase shifter 8 is, the input end of the second digital phase shifter 9 is connected with the output end of the third single-phase variable frequency power supply 6 through a second high voltage cable 10, three excitation transformers are arranged in parallel, namely a first excitation transformer 11, a second excitation transformer 12 and a third excitation transformer 13, the primary side of the first excitation transformer 11 is connected with the output end of the first digital phase shifter 8, the primary side of the third excitation transformer 13 is connected with the output end of the second digital phase shifter 9, the primary side of the second excitation transformer 12 is connected with the output end of the second single-phase variable frequency power supply 5, one ends of the secondary sides of the first excitation transformer 11, the second excitation transformer 12 and the third excitation transformer 13 are grounded GND, the other ends of the secondary sides of the first excitation transformer 11, the second excitation transformer 12 and the third excitation transformer 13 are connected with the triangular connection controllable reactor group 2 in parallel through a pressure line A14, the delta connection parallel controllable reactor group 2 is provided with three leading-out points, and the three leading-out points are as follows: a. b and c, the three leading-out points are respectively three vertexes of the triangle connection parallel controllable reactor group 2, and the three leading-out points are respectively connected with the tested transformer 3 through a voltage adding line B16.
Preferably, the delta-connected parallel controllable reactor group 2 is composed of three parallel controllable reactor units 15, and the heads and the ends of the parallel controllable reactor units are connected with each other.
The test method of the transformer three-phase partial discharge simultaneous pressurization test device based on the single-phase variable frequency power supply comprises the following steps:
the first step is as follows: selecting the capacity of a 380V power supply system 1, selecting the switching-on/off current of a 380V three-phase power supply to be 1000A for a three-winding three-phase transformer with 220kV/110kV/35kV, selecting the switching-on/off current of a 380V three-phase power supply to be 1500A for a double-winding three-phase transformer with 500kV/20kV, and selecting the switching-on/off current of a 242kV/15kV double-winding three-phase power supply to be 1800A;
the second step is that: firstly, equally distributing nine first high-voltage cables 7 with the rated voltage of 380V and the current-carrying capacity of 3000A into three groups, wherein one end of each group of three cables is respectively connected with the output of a 380V power supply system 1, and the other end of each group of three cables is respectively connected with the input sides of a first single-phase variable frequency power supply 4, a second single-phase variable frequency power supply 5 and a third single-phase variable frequency power supply 6, so that the output of the 380V power supply system 1 is evenly distributed to the first single-phase variable frequency power supply 4, the second single-phase variable frequency power supply 5 and the third single;
the third step: secondly, distributing six second high-voltage cables with the rated voltage of 380V and the current-carrying capacity of 2000A into three groups, wherein one end of each group of two second high-voltage cables is connected with the output sides of a first single-phase variable-frequency power supply 4, a second single-phase variable-frequency power supply 5 and a third single-phase variable-frequency power supply 6, the other end of a second high-voltage cable 10 at the second single-phase variable-frequency power supply 5 is directly connected with the primary side of a second excitation transformer 12, the other two groups of second high-voltage cables 10 are respectively connected with a first digital phase shifter 8 and a second digital phase shifter 9, the first digital phase shifter 8 is connected with the primary side of the first excitation transformer 11, the second digital phase shifter 9 is connected with the primary side of the third excitation transformer 13, the first digital phase shifter 8 moves the input voltage waveform by 120 degrees in advance by default, and the second digital phase;
the fourth step: a component compensation loop, wherein three parallel controllable reactor monomers 15 are connected end to form a triangular connection parallel controllable reactor group 2, the inductance value of the reactor is selected to be 1H for a 500kV transformer, and the inductance value of the reactor is selected to be 2.5H for a 220kV transformer;
the fifth step: grounding one ends of secondary sides of a first exciting transformer 11, a second exciting transformer 12 and a third exciting transformer 13, connecting the other ends of the secondary sides with a triangular connection parallel controllable reactor group 2 through a pressure line A14, wherein the pressure line A14 is a sheath line with a cross section of 4 square millimeters, and three leading-out points of the triangular connection parallel controllable reactor group 2 are connected with the input end of the low-voltage side of a tested transformer 3 through a pressure line B16 to complete the construction of a test loop;
and a sixth step: and starting a three-phase partial discharge simultaneous pressurization test of the three-phase transformer, adjusting the frequencies of the first single-phase variable frequency power supply 4, the second single-phase variable frequency power supply 5 and the third single-phase variable frequency power supply 6 to enable the whole test loop to be in a complete parallel resonance loop, wherein the frequencies of the first single-phase variable frequency power supply 4, the second single-phase variable frequency power supply 5 and the third single-phase variable frequency power supply 6 are consistent, simultaneously observing the output voltage waveforms of the first single-phase variable frequency power supply 4, the second single-phase variable frequency power supply 5 and the third single-phase variable frequency power supply 6, if the voltage waveforms of the first single-phase variable frequency power supply 4, the second single-phase variable frequency power supply 5 and the third single-phase variable frequency power supply 6 are 120 degrees different from each.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (3)
1. The device is characterized by comprising a 380V power supply system (1), a single-phase variable frequency power supply with adjustable frequency, a digital phase shifter, an excitation transformer, a delta connection parallel controllable reactor group (2) and a tested transformer (3), wherein the single-phase variable frequency power supply comprises three parallel first single-phase variable frequency power supplies (4), second single-phase variable frequency power supplies (5) and third single-phase variable frequency power supplies (6), the 380V power supply system (1) is connected with the input ends of the first single-phase variable frequency power supply (4), the second single-phase variable frequency power supplies (5) and the third single-phase variable frequency power supplies (6) through a first high-voltage cable (7), the digital phase shifter comprises a first digital phase shifter (8) and a second digital phase shifter (9), and the input end of the first digital phase shifter (8) is connected with the output end of the first single-phase variable frequency power supply (4) The input end of the second digital phase shifter (9) is connected with the output end of the third single-phase variable frequency power supply (6) through a second high-voltage cable (10), the exciting transformers are connected in parallel and are three, namely a first exciting transformer (11), a second exciting transformer (12) and a third exciting transformer (13), the primary side of the first exciting transformer (11) is connected with the output end of the first digital phase shifter (8), the primary side of the third exciting transformer (13) is connected with the output end of the second digital phase shifter (9), the primary side of the second exciting transformer (12) is connected with the output end of the second single-phase variable frequency power supply (5), one ends of the secondary sides of the first exciting transformer (11), the second exciting transformer (12) and the third exciting transformer (13) are grounded GND, the other ends of the secondary sides of the first exciting transformer (11), the second exciting transformer (12) and the third exciting transformer (13) are connected with the triangular connection parallel controllable reactor group (2) through a voltage adding line A (14), the triangular connection parallel controllable reactor group (2) is provided with three leading-out points, the three leading-out points are three vertexes of the triangular connection parallel controllable reactor group (2), and the three leading-out points are connected with the tested transformer (3) through voltage adding lines B (16).
2. The device for testing the simultaneous voltage and discharge of the three-phase partial discharge of the transformer based on the single-phase variable frequency power supply is characterized in that the delta connection parallel controllable reactor group (2) is composed of three parallel controllable reactor units (15), and the heads and the ends of the three parallel controllable reactor units are connected with each other.
3. The test method of the single-phase variable frequency power supply-based transformer three-phase partial discharge simultaneous pressurization test device in claim 1 is characterized by comprising the following steps:
the first step is as follows: selecting the capacity of a 380V power supply system (1), selecting the switching-on/off current of a 380V three-phase power supply to be 1000A for a 220kV/110kV/35kV three-winding three-phase transformer, selecting the switching-on/off current of a 380V three-phase power supply to be 1500A for a 500kV/20kV double-winding three-phase transformer, and selecting the switching-on/off current of a 242kV/15kV double-winding three-phase power supply to be 1800A;
the second step is that: firstly, uniformly distributing nine first high-voltage cables (7) with the rated voltage of 380V and the current-carrying capacity of 3000A into three groups, wherein one end of each group of three cables is respectively connected with the output of a 380V power supply system (1), and the other end of each group of three cables is respectively connected with the input sides of a first single-phase variable frequency power supply (4), a second single-phase variable frequency power supply (5) and a third single-phase variable frequency power supply (6), so that the output of the 380V power supply system (1) is uniformly distributed to the first single-phase variable frequency power supply (4), the second single-phase variable frequency power supply (5) and the third single-phase variable;
the third step: secondly, evenly dividing six second high-voltage cables (10) with the rated voltage of 380V and the current-carrying capacity of 2000A into three groups, wherein one end of each group of two cables is connected with the output sides of a first single-phase variable-frequency power supply (4), a second single-phase variable-frequency power supply (5) and a third single-phase variable-frequency power supply (6), the other end of the second high-voltage cable (10) at the second single-phase variable-frequency power supply (5) is directly connected with the primary side of a second excitation transformer (12), the other two groups of second high-voltage cables (10) are respectively connected with a first digital phase shifter (8) and a second digital phase shifter (9), the first digital phase shifter (8) is connected with the primary side of a first excitation transformer (11), the second digital phase shifter (9) is connected with the primary side of a third excitation transformer (13), the first digital phase shifter (8) moves the input voltage waveform by 120 degrees in advance by default, and the second digital phase shifter (9) moves the input voltage waveform by 120 degrees in delay by default;
the fourth step: the component compensation loop is characterized in that three parallel controllable reactor monomers (15) are connected end to form a triangular connection parallel controllable reactor group (2), the inductance value of a reactor is selected to be 1H for a 500kV transformer, and the inductance value of a reactor is selected to be 2.5H for a 220kV transformer;
the fifth step: grounding one ends of secondary sides of a first exciting transformer (11), a second exciting transformer (12) and a third exciting transformer (13), connecting the other ends of the secondary sides of the first exciting transformer, the second exciting transformer and the third exciting transformer with a triangular connection method parallel controllable reactor group (2) through a voltage-adding line A (14), wherein the voltage-adding line A (14) is a sheath line with the cross section of 4 square millimeters, and three leading-out points of the triangular connection method parallel controllable reactor group (2) are connected with the input end of the low-voltage side of the tested transformer (3) through a voltage-adding line B (16) to complete the construction of a test loop;
and a sixth step: and starting a three-phase partial discharge simultaneous pressurization test of the three-phase transformer, adjusting the frequencies of the first single-phase variable frequency power supply (4), the second single-phase variable frequency power supply (5) and the third single-phase variable frequency power supply (6) to enable the whole test loop to be in a complete parallel resonance loop, and enabling the frequencies of the first single-phase variable frequency power supply (4), the second single-phase variable frequency power supply (5) and the third single-phase variable frequency power supply (6) to be consistent, and simultaneously observing the output voltage waveforms of the first single-phase variable frequency power supply (4), the second single-phase variable frequency power supply (5) and the third single-phase variable frequency power supply (6), wherein if the voltage waveforms of the first single-phase variable frequency power supply (4), the second single-phase variable frequency power supply (5) and the third single-phase variable frequency power supply (6) are 120 degrees.
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