CN108375750B - Electromagnetic voltage transformer induction voltage withstand and partial discharge test device and method - Google Patents
Electromagnetic voltage transformer induction voltage withstand and partial discharge test device and method Download PDFInfo
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Abstract
The invention discloses an induction voltage withstand and partial discharge test device and method for an electromagnetic voltage transformer, wherein the highest voltage value of the three-phase electromagnetic voltage transformer is obtained according to the rated voltage value of the three-phase electromagnetic voltage transformer; obtaining values of induced withstand voltage test voltage U1, partial discharge test pre-applied voltage U2 and partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer; the control power supply generation device regulates the secondary side voltage of the three-phase electromagnetic voltage transformer, controls the primary side of the three-phase electromagnetic voltage transformer to sequentially generate an induced withstand voltage test voltage U1, a partial discharge test pre-charging voltage U2 and a partial discharge test voltage U3, and controls the three-phase electromagnetic voltage transformer to internally generate partial discharge; the method comprises the steps of obtaining a primary side voltage value of the three-phase electromagnetic voltage transformer and obtaining a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer.
Description
Technical Field
The invention relates to the technical field of electrical online monitoring, in particular to an electromagnetic voltage transformer induction voltage withstand and partial discharge test device and method.
Background
The electromagnetic voltage transformer is a high-voltage device which converts high voltage in a power grid into low voltage and is convenient to monitor and measure. Structurally, the electromagnetic voltage transformer is a step-down transformer with small capacity, small volume and large voltage ratio, has the same basic principle as the transformer, and also comprises a primary winding, a secondary winding, an iron core, a lead-out wire, an insulation structure and the like. The working principle, the construction and the connection method of the electromagnetic voltage transformer are the same as those of a transformer. The electromagnetic voltage transformer is mainly used for transmitting signals, and requires that the transformation ratio (ratio difference) of an original side and the phase difference (angle difference) of the original side and the auxiliary side meet certain accuracy requirements. The transformer is mainly used for transmitting power, and requires small loss and high efficiency in the transmission process.
When the electromagnetic voltage transformer is just produced, long-time tests in severe environment are not carried out, a power supply with rated voltage and frequency is externally applied for tests, the voltages among turns, layers and sections of the winding are not enough to reach the breakdown voltage of dielectric defects, so that the insulation defects are difficult to discharge and breakdown, and the no-load current and the no-load power consumption of the electromagnetic voltage transformer with the hidden danger of insulation faults are not greatly different from those of the similar electromagnetic voltage transformers with good insulation performance, so that the hidden dangers are difficult to find. And the induction withstand voltage test applies voltage more than 2 times of rated voltage to the electromagnetic voltage transformer, higher and more concentrated field intensity can be established at the longitudinal insulation defect, and the voltage between turns, layers and sections of the winding reaches and exceeds the breakdown voltage at the dielectric defect. The induction withstand voltage test applies rated frequency of more than 2 times to the electromagnetic voltage transformer, the breakdown voltage of the solid dielectric can be greatly reduced by higher frequency, so that the insulation defect is easier to break down, and the breakdown of the insulation defect can be ensured by the action time of external voltage specified by the induction withstand voltage test. Therefore, the induction withstand voltage test can reliably detect the insulating property of the electromagnetic voltage transformer.
The test method of the partial discharge test is similar to the voltage resistance test, but a conductive layer such as aluminum foil is wrapped outside an insulating layer of a conductor, and leakage current at a partial position is measured by a special detection instrument to assess which partial position in the whole insulation has relatively weak insulation, namely to assess the distribution of the leakage current. The leakage current is large, and the insulation is relatively thin. For a large motor winding, the insulation performance can affect the efficiency and the heating of the large motor winding, and the integral electromagnetic field is easy to be disordered due to relative electric field concentration at the position with weak insulation.
For electromagnetic voltage transformers with voltage class of 35kV and above, induction withstand voltage and partial discharge tests are required during delivery and handover tests, and at the present stage, testers can only perform ac withstand voltage tests and partial discharge tests on a single electromagnetic voltage transformer respectively. Even if a tester spends a large amount of time to change the test wiring mode, the actual operation conditions on site cannot be simulated, and three electromagnetic voltage transformers are tested simultaneously, and the simultaneous measurement of the induction withstand voltage and the partial discharge of the three-phase electromagnetic voltage transformers cannot be realized.
Disclosure of Invention
The invention provides an induction voltage withstand and partial discharge test device and method for an electromagnetic voltage transformer, and aims to solve the problem that testers at the present stage can only respectively perform an alternating current voltage withstand test and a partial discharge test on a single electromagnetic voltage transformer, and cannot simultaneously measure the induction voltage withstand and the partial discharge of a three-phase electromagnetic voltage transformer.
In a first aspect, the present invention provides an apparatus for testing induced withstand voltage and partial discharge of an electromagnetic voltage transformer, including: a power supply generating device, a three-phase electromagnetic voltage transformer, a partial discharge measuring device and a test voltage detecting device, wherein,
the power generation device comprises a three-phase power supply, a low-voltage filter, a three-phase voltage regulation and control device, a three-phase frequency tripling generator, a transformer and a high-voltage filter;
the three-phase power supply, the low-voltage filter, the three-phase voltage regulating and controlling device, the three-phase frequency tripling generator, the transformer and the high-voltage filter are sequentially connected;
the three-phase electromagnetic voltage transformer comprises three electromagnetic voltage transformers, and the three electromagnetic voltage transformers are respectively connected with the high-voltage filter;
the partial discharge measuring device comprises a partial discharge tester and three coupling capacitors; the primary side of each electromagnetic voltage transformer is correspondingly connected with one coupling capacitor; the three coupling capacitors are respectively connected with the partial discharge tester;
the test voltage detection device comprises three resistance type voltage dividers, and the primary side of each electromagnetic voltage transformer is correspondingly connected with one resistance type voltage divider; and the three resistance type voltage dividers are respectively connected with the three-phase voltage regulating and controlling device.
Optionally, the three-phase triple-frequency generator includes three iron cores, each of the iron cores is provided with a primary coil and three secondary coils, the primary coil is connected into a star shape through a connecting cable, the primary coil is provided with three input terminal sockets, and the three input terminal sockets are respectively connected with the three-phase voltage regulating and controlling device;
the three secondary side coils are connected into a triangle through connecting cables, one of the triangle is broken to form two output terminal ends, and the two terminal ends are connected with the secondary side of any one electromagnetic voltage transformer through the transformer and the high-voltage filter.
Optionally, the coupling capacitor has a measurement range of 0-100 kv.
Optionally, the measurement range of the resistive voltage divider is 0-100 kv.
In a second aspect, the invention further provides an induced withstand voltage and partial discharge test method for the electromagnetic voltage transformer, which comprises the following steps:
obtaining the highest voltage value of the three-phase electromagnetic voltage transformer according to the rated voltage value of the three-phase electromagnetic voltage transformer;
obtaining values of an induced withstand voltage test voltage U1, a partial discharge test pre-applied voltage U2 and a partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer;
controlling a power generation device to regulate the secondary side voltage of the three-phase electromagnetic voltage transformer, controlling the primary side of the three-phase electromagnetic voltage transformer to sequentially generate the induced withstand voltage test voltage U1, the partial discharge test pre-charging voltage U2 and the partial discharge test voltage U3, and controlling the three-phase electromagnetic voltage transformer to internally generate partial discharge;
acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer, and acquiring a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer.
Optionally, the power generation device is controlled to regulate the secondary side voltage of the three-phase electromagnetic voltage transformer according to the following steps:
controlling the three-phase power supply to output an initial voltage with the frequency of 50 Hz;
controlling a low-voltage filter to filter out higher harmonics in the initial voltage to obtain a secondary voltage with the frequency of 50Hz, and transmitting the secondary voltage to a three-phase voltage regulator and a control device;
controlling the three-phase voltage regulator and the control device to regulate the secondary voltage with the frequency of 50Hz to obtain the quartic voltage with the frequency of 50 Hz;
controlling a three-phase frequency tripling generator to convert the four-time voltage with the frequency of 50Hz into five-time voltage with the frequency of 150 Hz;
the transformer with the control transformation ratio of 1:2 raises the voltage value of the voltage with the frequency of 150Hz for five times to obtain voltage for six times, and the voltage is transmitted to the high-voltage filter;
and controlling the high-voltage filter to filter out low-order harmonic waves in the sixth-order voltage to obtain seventh-order voltage, and transmitting the seventh-order voltage to the secondary side of the three-phase electromagnetic voltage transformer to obtain the secondary side voltage of the three-phase electromagnetic voltage transformer.
Optionally, the primary side voltage value of the three-phase electromagnetic voltage transformer is obtained according to the following steps, and a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer is obtained:
controlling a resistance type voltage divider to monitor a voltage value of a primary side of the three-phase electromagnetic voltage transformer, and transmitting the voltage value to a three-phase voltage regulator and a control device;
and controlling a coupling capacitor to monitor the discharge value of the primary side of the three-phase electromagnetic voltage transformer and transmitting the discharge value to a partial discharge tester.
Optionally, the primary side of the three-phase electromagnetic voltage transformer is controlled to sequentially generate the induced withstand voltage test voltage U1, the partial discharge test pre-applied voltage U2, and the partial discharge test voltage U3 according to the following steps, where U1> U2> U3:
controlling the primary side of the three-phase electromagnetic voltage transformer to generate the induced withstand voltage test voltage U1 and maintaining the induced withstand voltage test voltage U1 for 40 s;
controlling the primary side of the three-phase electromagnetic voltage transformer to generate the partial discharge test pre-applied voltage U2 for more than 15 s;
and controlling the primary side of the three-phase electromagnetic voltage transformer to generate the partial discharge test voltage U3, and maintaining the partial discharge test voltage U3 for more than 1 min.
According to the technical scheme, the embodiment of the invention provides a device and a method for testing induction withstand voltage and partial discharge of an electromagnetic voltage transformer, wherein the device comprises a power generation device, a three-phase electromagnetic voltage transformer, a partial discharge measurement device and a test voltage detection device; obtaining values of induced withstand voltage test voltage U1, partial discharge test pre-applied voltage U2 and partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer; the control power supply generation device regulates the secondary side voltage of the three-phase electromagnetic voltage transformer, controls the primary side of the three-phase electromagnetic voltage transformer to sequentially generate an induced withstand voltage test voltage U1, a partial discharge test pre-charging voltage U2 and a partial discharge test voltage U3, and controls the three-phase electromagnetic voltage transformer to internally generate partial discharge; acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer, acquiring a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer, and completing an induction withstand voltage test and a partial discharge test of the three-phase electromagnetic voltage transformer. Therefore, the device and the method for testing the induction withstand voltage and the partial discharge of the electromagnetic voltage transformer can save the test time, improve the operation efficiency and realize the simultaneous measurement of the induction withstand voltage and the partial discharge of the three-phase electromagnetic voltage transformer.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a schematic diagram of a field test of an induced voltage withstand and partial discharge testing apparatus of an electromagnetic voltage transformer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a test for monitoring a release amount of a sample by a coupling capacitor according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a wiring diagram of a three-phase frequency tripling generator according to an embodiment of the present invention;
fig. 4 is a wiring schematic diagram of the transformation of the power frequency a-phase, power frequency B-phase and power frequency C-phase voltages into frequency tripling a-phase voltages according to the embodiment of the present invention;
fig. 5 is a schematic diagram of an applied voltage during an induced withstand voltage and partial discharge test of the electromagnetic voltage transformer according to the embodiment of the present invention;
fig. 6 is a flowchart of an induced voltage withstand and partial discharge testing method of an electromagnetic voltage transformer according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for controlling a power generating device to adjust a secondary side voltage of a three-phase electromagnetic voltage transformer according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for obtaining a primary side voltage value of a three-phase electromagnetic voltage transformer and obtaining a discharge value of a partial discharge generated inside the three-phase electromagnetic voltage transformer according to an embodiment of the present invention;
fig. 9 is a flowchart of a method for controlling the primary side of the three-phase electromagnetic voltage transformer to sequentially generate the induced withstand voltage test voltage U1, the partial discharge test precharge voltage U2, and the partial discharge test voltage U3 according to an embodiment of the present invention.
Illustration of the drawings:
the device comprises a 1-three-phase power supply, a 2-low-voltage filter, a 3-three-phase voltage regulating and controlling device, a 4-three-phase frequency tripling generator, a 5-transformer, a 6-high-voltage filter, a 7-electromagnetic voltage transformer, a 71-resistance voltage divider, a 72-coupling capacitor and a 73-partial discharge tester.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic diagram of a field test of an induced voltage withstand and partial discharge testing apparatus of an electromagnetic voltage transformer according to an embodiment of the present invention.
The invention provides an induction withstand voltage and partial discharge test device for an electromagnetic voltage transformer, which comprises: the device comprises a power supply generating device, a three-phase electromagnetic voltage transformer, a partial discharge measuring device and a test voltage detecting device, wherein the power supply generating device comprises a three-phase power supply 1, a low-voltage filter 2, a three-phase voltage regulating and controlling device 3, a three-phase triple frequency generator 4, a transformer 5 and a high-voltage filter 6; the three-phase power supply 1, the low-voltage filter 2, the three-phase voltage regulating and controlling device 3, the three-phase frequency tripling generator 4, the transformer 5 and the high-voltage filter 6 are connected in sequence.
The power generation device is used for converting three-phase power frequency voltage into three-phase frequency tripling voltage, adjusting the voltage, processing the voltage, reducing interference to a test and finally adjusting secondary side voltage of the three-phase electromagnetic voltage transformer.
Specifically, the working process is exemplified: selecting the output voltage of a three-phase power supply 1 with the rated voltage of 400V; the selected low-voltage filter 2 is a voltage passive filter, so that higher harmonics in the three-phase power supply 1 can be filtered out, and the interference of the harmonics in the power supply to the test is reduced. The low-voltage filter 2 is connected with a three-phase voltage regulator and control device 3, the rated voltage of a primary winding of the three-phase voltage regulator and control device 3 is 400V, the output voltage of a secondary winding is 0-380V, and the voltage value can be continuously and randomly adjusted. The three-phase voltage regulator and control device 3 outputs voltage to the three-phase frequency tripling generator 4, and the voltage with the frequency of 50Hz is converted into the voltage of 150Hz through the three-phase frequency tripling generator 4. The 150Hz voltage is stepped up by a transformer 5 with a ratio of 1: 2. And then, the high-voltage filter 6 filters the voltage, filters high and low order harmonics, reduces the interference of the harmonics on the test, and then obtains the filtered voltage.
The three-phase electromagnetic voltage transformer comprises three electromagnetic voltage transformers 7, and the three electromagnetic voltage transformers 7 are respectively connected with the high-voltage filter 6; the voltage filtered by the high-voltage filter 6 is output to the secondary side of the electromagnetic voltage transformer 7, and an induced voltage is obtained and discharged at the primary side of the electromagnetic voltage transformer 7.
The partial discharge measurement device includes a partial discharge tester 73 and three coupling capacitors 72; the primary side of each electromagnetic voltage transformer 7 is correspondingly connected with a coupling capacitor 72; the three coupling capacitors 72 are respectively connected with a partial discharge tester 73; the coupling capacitor 72 measures in the range of 0-100 kv. The coupling capacitor 72 of 0-100kV can accurately monitor the partial discharge under the voltage of 0-100kV, and the maximum partial discharge is not more than 5 pc.
Referring to fig. 2, fig. 2 is a schematic diagram of a test for monitoring the release amount of a sample by a coupling capacitor. Cx represents a sample, namely a tested device, in the embodiment of the invention, a three-phase electromagnetic voltage transformer is adopted, Ck represents a coupling capacitor, and a closed loop is formed by partial discharge pulses; zm represents a measurement impedance capable of detecting a partial discharge signal; z represents low-pass filtering, so that the interference of an outer loop can be prevented from entering a measuring loop, and the partial discharge signal is prevented from flowing to a power supply.
The method for detecting the release quantity by the coupling capacitor 72 is a pulse current method, and the basic principle is as follows: referring to fig. 2, when a partial discharge occurs to the sample Cx, a transient change Δ u occurs at both ends of the sample Cx, and the transient change Δ u is coupled to the detection impedance Zm through the coupling capacitor Ck, so that a pulse current I is generated in the loop. The pulse current I flows through the pulse voltage generated by the detection impedance Zm to be collected, amplified and displayed, so that parameters such as the apparent discharge amount of the partial discharge can be measured. The pulsed current method mainly uses the lower frequency part of the partial discharge signal spectrum, typically several kHz to several hundreds kHz, to avoid radio interference.
The detection impedance Zm is generally provided with an RLC-type detection impedance. It measures the pulse signal generated by partial discharge and suppresses the power frequency and other low-frequency interference signals of the test power supply.
Specifically, the discharge value of the primary side of the three-phase electromagnetic voltage transformer is monitored by the three coupling capacitors 72, and finally transmitted to the partial discharge tester 73, so that the partial discharge test is completed.
The test voltage detection device comprises three resistance type voltage dividers 71, and the primary side of each electromagnetic type voltage transformer 7 is correspondingly connected with one resistance type voltage divider 71; the three resistance type voltage dividers 71 are respectively connected with the three-phase voltage regulating and controlling device 3.
The resistive voltage divider 71 measures in the range of 0-100 kv. The resistance-type voltage divider 71 of 100kV can accurately monitor the voltage of 0-100kV, and under the voltage of 0-100kV, the maximum partial discharge of the resistance-type voltage divider 71 is not more than 2pc, and the resistance-type voltage divider 71 monitors a voltage loop and returns the voltage of the primary side of the electromagnetic voltage transformer 7 to the three-phase voltage regulator and the control device 3.
Referring to fig. 3, fig. 3 is a schematic diagram of a wiring diagram of a three-phase frequency tripler generator according to an embodiment of the present invention.
The three-phase triple frequency generator comprises three iron cores, wherein each iron core is provided with a primary coil and three secondary coils, the primary coils are connected into a star shape through connecting cables, the primary coils are provided with three input terminal sockets, and the three input terminal sockets are respectively connected with the three-phase voltage regulating and controlling device.
The three secondary side coils are connected into a triangle through connecting cables, one part of the triangle is broken to form two output connection terminals, and the two output connection terminals are connected with the secondary side of any electromagnetic voltage transformer 7 through a transformer 5 and a high-voltage filter 6.
Specifically, in the embodiment of the present invention, the three-phase power supply 1 is an A, B, C three-phase power supply, and after the A, B, C three-phase power supply outputs a voltage, the voltage passes through the low-voltage filter 2 and the three-phase voltage regulation and control device 3 to reach the three-phase frequency tripling generator 4, and as shown in fig. 3, outputs a power frequency a-phase voltage, a power frequency B-phase voltage, and a power frequency C-phase voltage. The three-phase triple frequency generator 4 converts the power frequency A phase, the power frequency B phase and the power frequency C phase voltage into a triple frequency A phase, a triple frequency B phase and a triple frequency C phase voltage.
Now, the principle of voltage conversion of a three-phase frequency tripling generator will be described by taking the process of converting a power frequency a-phase voltage into a frequency tripling a-phase voltage as an example. Referring to fig. 4, fig. 4 is a wiring schematic diagram of converting the power frequency a-phase, power frequency B-phase and power frequency C-phase voltages provided by the embodiment of the present invention into frequency tripling a-phase voltages. Each iron core of the three-phase triple frequency generator 4 is respectively provided with a primary coil and three secondary coils, the primary coils are connected into a star connection method by three internal connecting cables, namely tail end terminals X, Y, Z of primary coils H1, H2 and H3 of the iron cores are connected, and then head end terminals A, B, C are respectively connected onto input terminal terminals by connecting cables and are represented by symbols U, V and W; the power frequency phase A, the power frequency phase B and the power frequency phase C are input to the terminal U, V and the terminal W; and then the secondary coils of the iron core are connected into an open delta connection method by using internal connecting cables, namely, the tail end x of the secondary coil h1 of the iron core T1 is connected with the head end b of the secondary winding h2 of the iron core T2, the tail end y of the secondary winding h2 of the iron core T2 is connected with the head end c of the secondary winding h3 of the iron core T3, and finally, the head end a of the secondary winding h1 of the iron core T1 and the tail end z of the secondary winding h3 of the transformer T3 are respectively connected to two output terminals by using connecting cables, wherein the output terminals are denoted by symbols m and n. Two output terminal ends are connected with the secondary side of any one electromagnetic voltage transformer 7 through a transformer 5 and a high-voltage filter 6, and provide triple-frequency A-phase voltage for the electromagnetic voltage transformer 7.
In the prior art, three electromagnetic voltage transformers can be tested simultaneously, the test voltages are the same, and the voltages among the three electromagnetic voltage transformers have no phase difference. If only a single-phase triple-frequency power supply is adopted, no voltage exists between three phases, and the actual operation state of the three-phase electromagnetic voltage transformer cannot be simulated. The induction voltage-withstand and partial discharge test device for the electromagnetic voltage transformer provided by the embodiment of the invention can output a three-phase triple frequency power supply, and when three electromagnetic voltage transformers are tested, the voltages among the three electromagnetic voltage transformers have 120-degree phase difference, so that the actual operation state of the three-phase electromagnetic voltage transformer can be effectively simulated.
The electromagnetic voltage transformer induction withstand voltage and partial discharge test device provided by the embodiment of the invention uses the combination of three iron cores, the primary coil of each iron core is in a star connection method, the secondary coil is in an open triangle, and when the iron core is not saturated, the main magnetic flux generated by the iron core is always flat-top wave. Since the main magnetic flux of the flat-top waveform contains a large component of the third harmonic magnetic energy Φ 3, and the third harmonic magnetic flux frequency f3 is 3f1, the main magnetic flux induces the third harmonic phase potential. Because the primary coil is in star connection and the secondary coil is in open triangle connection, the iron core works in a saturated state, no-load current I is in a sharp top wave, and the high-order harmonic wave is contained in the no-load current I besides the fundamental wave. The amplitude of I in the higher harmonic wave is larger, and three-phase fundamental wave components are mutually offset due to the opening of the secondary side coil, and only third harmonic wave output is left. Compared with a frequency tripling power supply obtained by other modes, the mode has good voltage waveform and no other harmonic waves, and better ensures the measurement precision of the induction withstand voltage and partial discharge test of the electromagnetic voltage transformer.
Referring to fig. 5, fig. 5 is a schematic diagram of an applied voltage during an induced breakdown voltage and partial discharge test according to an embodiment of the present invention. Referring to fig. 1, all the devices for the induced withstand voltage and partial discharge test were connected to start the test. And regulating a three-phase voltage regulator and a control device 3 in the power generation device to finally control the voltage of the primary side of the three-phase electromagnetic voltage transformer. An induced withstand voltage test voltage U1, a partial discharge test pre-application voltage U2 and a partial discharge test voltage U3 are respectively applied to the primary sides of the three-phase electromagnetic voltage transformer.
The induced withstand voltage test voltage U1, the partial discharge test pre-applied voltage U2 and the partial discharge test voltage U3 can be obtained according to the rated voltage value of the three-phase electromagnetic voltage transformer. Specifically, the highest voltage value of the three-phase electromagnetic voltage transformer is obtained according to the rated voltage value of the three-phase electromagnetic voltage transformer; and obtaining values of the induced withstand voltage test voltage U1, the partial discharge test pre-applied voltage U2 and the partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer.
The voltage application program is shown in fig. 5: the section A is induced withstand voltage test voltage, the duration time is 40S, the section B is partial discharge pre-applied voltage, and the duration time is not less than 15S; and the section C is partial discharge test voltage, and the duration is not less than 1 min. As shown in fig. 5, U1> U2> U3.
Specifically, the three-phase electromagnetic voltage transformer induction withstand voltage and partial discharge test process comprises the following steps:
according to the rated voltage of the three-phase electromagnetic voltage transformer, the highest voltage of the three-phase electromagnetic voltage transformer is obtained, and the induced withstand voltage test voltage value U1, the partial discharge pre-charging voltage value U2 and the partial discharge test voltage value U3 are calculated. As shown in fig. 5, an induced breakdown voltage test voltage U1, a partial discharge test precharge voltage U2, and a partial discharge test voltage U3 are applied to the primary side of the electromagnetic voltage transformer, respectively.
When the voltage at the primary side of the three-phase electromagnetic voltage transformer rises from 0 to an induced withstand voltage test voltage U1, the voltage at the primary side of the three-phase electromagnetic voltage transformer is monitored by the resistive voltage divider 71, the discharge value at the primary side of the three-phase electromagnetic voltage transformer is monitored by the coupling capacitor 72, and the discharge value is transmitted to the partial discharge tester 73. In the process, the three-phase electromagnetic voltage transformer is not broken down and flashover, and the voltages at the two ends of the three-phase electromagnetic voltage transformer are not suddenly reduced, so that the three-phase electromagnetic voltage transformer is qualified, and the three-phase electromagnetic voltage transformer passes an induction withstand voltage test.
And then, carrying out a partial discharge test on the three-phase electromagnetic voltage transformer, reducing the voltage of the primary side of the three-phase electromagnetic voltage transformer from the induced withstand voltage test voltage U1 to a partial discharge pre-added voltage value U2, then reducing the voltage to a partial discharge test voltage value U3, and finally reducing the voltage to 0, wherein in the voltage reduction process, the voltage of the primary side of the three-phase electromagnetic voltage transformer is monitored by using a resistance voltage divider 71, the discharge value of the primary side of the three-phase electromagnetic voltage transformer is monitored by using a coupling capacitor 72, and the discharge value is transmitted to a partial discharge tester 73, so that the partial discharge test is completed.
Referring to fig. 6, fig. 6 is a flowchart of an induced withstand voltage and partial discharge testing method of an electromagnetic voltage transformer according to an embodiment of the present invention.
The invention provides an induction voltage withstand and partial discharge test method for an electromagnetic voltage transformer, which comprises the following steps of:
s110, obtaining the highest voltage value of the three-phase electromagnetic voltage transformer according to the rated voltage value of the three-phase electromagnetic voltage transformer;
s120, obtaining values of an induced withstand voltage test voltage U1, a partial discharge test pre-charging voltage U2 and a partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer;
s130, controlling a power supply generating device to adjust the secondary side voltage of the three-phase electromagnetic voltage transformer, controlling the primary side of the three-phase electromagnetic voltage transformer to sequentially generate an induced withstand voltage test voltage U1, a partial discharge test pre-charging voltage U2 and a partial discharge test voltage U3, and controlling the three-phase electromagnetic voltage transformer to internally generate partial discharge;
s140, acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer and acquiring a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer.
Referring to fig. 7, fig. 7 is a flowchart of a method for controlling a power generating device to regulate a secondary side voltage of a three-phase electromagnetic voltage transformer according to an embodiment of the present invention.
Controlling a power supply generating device to regulate the secondary side voltage of the three-phase electromagnetic voltage transformer according to the following steps:
s210, controlling the three-phase power supply to output an initial voltage with the frequency of 50 Hz;
s220, controlling a low-voltage filter to filter out higher harmonics in the initial voltage to obtain a secondary voltage with the frequency of 50Hz, and transmitting the secondary voltage to a three-phase voltage regulator and a control device;
s230, controlling the three-phase voltage regulator and the control device to regulate the secondary voltage with the frequency of 50Hz to obtain the fourth-time voltage with the frequency of 50 Hz;
s240, controlling the three-phase triple frequency generator to convert the four-time voltage with the frequency of 50Hz into five-time voltage with the frequency of 150 Hz;
s250, controlling a transformer with a transformation ratio of 1:2 to increase the voltage value of the voltage with the frequency of 150Hz for five times to obtain a voltage with the frequency of six times, and transmitting the voltage to a high-voltage filter;
and S260, controlling the high-voltage filter to filter out low-order harmonics in the sixth-order voltage to obtain seventh-order voltage, and transmitting the seventh-order voltage to the secondary side of the three-phase electromagnetic voltage transformer to obtain secondary-side voltage of the three-phase electromagnetic voltage transformer.
Referring to fig. 8, fig. 8 is a flowchart of a method for obtaining a primary side voltage value of a three-phase electromagnetic voltage transformer and obtaining a discharge value of a partial discharge generated inside the three-phase electromagnetic voltage transformer according to an embodiment of the present invention.
Acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer and acquiring a discharge value of partial discharge generated in the three-phase electromagnetic voltage transformer according to the following steps:
s310, controlling the resistance type voltage divider to monitor a primary side voltage value of the three-phase electromagnetic voltage transformer and transmitting the voltage value to the three-phase voltage regulator and the control device;
and S320, controlling the coupling capacitor to monitor the discharge value of the primary side of the three-phase electromagnetic voltage transformer and transmitting the discharge value to the partial discharge tester.
Referring to fig. 9, fig. 9 is a flowchart of a method for controlling a primary side of a three-phase electromagnetic voltage transformer to sequentially generate an induced withstand voltage test voltage U1, a partial discharge test precharge voltage U2, and a partial discharge test voltage U3 according to an embodiment of the present invention.
Controlling the primary side of a three-phase electromagnetic voltage transformer to sequentially generate an induced withstand voltage test voltage U1, a partial discharge test pre-charging voltage U2 and a partial discharge test voltage U3 according to the following steps, wherein U1 is more than U2 is more than U3:
s410, controlling a primary side of a three-phase electromagnetic voltage transformer to generate an induced withstand voltage test voltage U1, and maintaining the induced withstand voltage test voltage U1 for 40S;
s420, controlling a primary side of the three-phase electromagnetic voltage transformer to generate partial discharge test pre-voltage U2, and maintaining the partial discharge test pre-voltage U2 for more than 15S;
and S430, controlling a primary side of the three-phase electromagnetic voltage transformer to generate a partial discharge test voltage U3, and maintaining the partial discharge test voltage U3 for more than 1 min.
According to the technical scheme, the embodiment of the invention provides a device and a method for testing induction withstand voltage and partial discharge of an electromagnetic voltage transformer, wherein the device comprises a power generation device, a three-phase electromagnetic voltage transformer, a partial discharge measurement device and a test voltage detection device; obtaining values of induced withstand voltage test voltage U1, partial discharge test pre-applied voltage U2 and partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer; the control power supply generation device regulates the secondary side voltage of the three-phase electromagnetic voltage transformer, controls the primary side of the three-phase electromagnetic voltage transformer to sequentially generate an induced withstand voltage test voltage U1, a partial discharge test pre-charging voltage U2 and a partial discharge test voltage U3, and controls the three-phase electromagnetic voltage transformer to internally generate partial discharge; acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer, acquiring a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer, and completing an induction withstand voltage test and a partial discharge test of the three-phase electromagnetic voltage transformer. Therefore, the device and the method for testing the induction withstand voltage and the partial discharge of the electromagnetic voltage transformer can save the test time, improve the operation efficiency and realize the simultaneous measurement of the induction withstand voltage and the partial discharge of the three-phase electromagnetic voltage transformer.
It should be noted that the same and similar parts in the various embodiments in this specification may be referred to each other. For the embodiment of the method for testing the induced withstand voltage and the partial discharge of the electromagnetic voltage transformer, the description is simple because the method is basically similar to the embodiment of the device, and the relevant points can be referred to the description in the embodiment of the device.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. The utility model provides an electromagnetic type voltage transformer responds to withstand voltage, partial discharge test device which characterized in that includes: a power supply generating device, a three-phase electromagnetic voltage transformer, a partial discharge measuring device and a test voltage detecting device, wherein,
the power generation device comprises a three-phase power supply, a low-voltage filter, a three-phase voltage regulation and control device, a three-phase frequency tripling generator, a transformer and a high-voltage filter;
the three-phase power supply, the low-voltage filter, the three-phase voltage regulating and controlling device, the three-phase frequency tripling generator, the transformer and the high-voltage filter are sequentially connected;
the three-phase electromagnetic voltage transformer comprises three electromagnetic voltage transformers, and the three electromagnetic voltage transformers are respectively connected with the high-voltage filter;
the partial discharge measuring device comprises a partial discharge tester and three coupling capacitors; the primary side of each electromagnetic voltage transformer is correspondingly connected with one coupling capacitor; the three coupling capacitors are respectively connected with the partial discharge tester;
the test voltage detection device comprises three resistance type voltage dividers, and the primary side of each electromagnetic voltage transformer is correspondingly connected with one resistance type voltage divider; the three resistance-type voltage dividers are respectively connected with the three-phase voltage regulating and controlling device；
The apparatus is configured to perform the following method:
obtaining the highest voltage value of the three-phase electromagnetic voltage transformer according to the rated voltage value of the three-phase electromagnetic voltage transformer;
obtaining values of an induced withstand voltage test voltage U1, a partial discharge test pre-applied voltage U2 and a partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer;
controlling a power generation device to regulate the secondary side voltage of the three-phase electromagnetic voltage transformer, controlling the primary side of the three-phase electromagnetic voltage transformer to sequentially generate the induced withstand voltage test voltage U1, the partial discharge test pre-charging voltage U2 and the partial discharge test voltage U3, and controlling the three-phase electromagnetic voltage transformer to internally generate partial discharge;
acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer, and acquiring a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer.
2. The apparatus according to claim 1, wherein said three-phase frequency tripling generator comprises three iron cores, each of said iron cores is provided with a primary winding and three secondary windings, said primary windings are connected to form a star shape by a connecting cable, said primary windings are provided with three input terminals, and said three input terminals are connected to said three-phase voltage regulating and controlling apparatus;
the three secondary side coils are connected into a triangle through connecting cables, one of the triangle is broken to form two output terminal ends, and the two terminal ends are connected with the secondary side of any one electromagnetic voltage transformer through the transformer and the high-voltage filter.
3. The electromagnetic voltage transformer induced withstand voltage and partial discharge test device as claimed in claim 1, wherein the measurement range of the coupling capacitor is 0-100 kv.
4. The apparatus of claim 1, wherein the resistive voltage divider has a measurement range of 0-100 kv.
5. An induction withstand voltage and partial discharge test method of an electromagnetic voltage transformer, which is applied to the device of any one of claims 1 to 4, and is characterized by comprising the following steps of:
obtaining the highest voltage value of the three-phase electromagnetic voltage transformer according to the rated voltage value of the three-phase electromagnetic voltage transformer;
obtaining values of an induced withstand voltage test voltage U1, a partial discharge test pre-applied voltage U2 and a partial discharge test voltage U3 of the three-phase electromagnetic voltage transformer according to the highest voltage value of the three-phase electromagnetic voltage transformer;
controlling a power generation device to regulate the secondary side voltage of the three-phase electromagnetic voltage transformer, controlling the primary side of the three-phase electromagnetic voltage transformer to sequentially generate the induced withstand voltage test voltage U1, the partial discharge test pre-charging voltage U2 and the partial discharge test voltage U3, and controlling the three-phase electromagnetic voltage transformer to internally generate partial discharge;
acquiring a primary side voltage value of the three-phase electromagnetic voltage transformer, and acquiring a discharge value of partial discharge generated inside the three-phase electromagnetic voltage transformer.
6. The method of claim 5, wherein the power generation device is controlled to regulate the secondary side voltage of the three-phase electromagnetic voltage transformer according to the following steps:
controlling the three-phase power supply to output an initial voltage with the frequency of 50 Hz;
controlling a low-voltage filter to filter out higher harmonics in the initial voltage to obtain a secondary voltage with the frequency of 50Hz, and transmitting the secondary voltage to a three-phase voltage regulator and a control device;
controlling the three-phase voltage regulator and the control device to regulate the secondary voltage with the frequency of 50Hz to obtain the quartic voltage with the frequency of 50 Hz;
controlling a three-phase frequency tripling generator to convert the four-time voltage with the frequency of 50Hz into five-time voltage with the frequency of 150 Hz;
the transformer with the control transformation ratio of 1:2 raises the voltage value of the voltage with the frequency of 150Hz for five times to obtain voltage for six times, and the voltage is transmitted to the high-voltage filter;
and controlling the high-voltage filter to filter out low-order harmonic waves in the sixth-order voltage to obtain seventh-order voltage, and transmitting the seventh-order voltage to the secondary side of the three-phase electromagnetic voltage transformer to obtain the secondary side voltage of the three-phase electromagnetic voltage transformer.
7. The method according to claim 5, wherein the primary side voltage value of the three-phase electromagnetic voltage transformer and the discharge amount value of the partial discharge generated inside the three-phase electromagnetic voltage transformer are obtained according to the following steps:
controlling a resistance type voltage divider to monitor a voltage value of a primary side of the three-phase electromagnetic voltage transformer, and transmitting the voltage value to a three-phase voltage regulator and a control device;
and controlling a coupling capacitor to monitor the discharge value of the primary side of the three-phase electromagnetic voltage transformer and transmitting the discharge value to a partial discharge tester.
8. The method as claimed in claim 5, wherein the primary side of the three-phase electromagnetic voltage transformer is controlled to sequentially generate the induced withstand voltage test voltage U1, the partial discharge test precharge voltage U2 and the partial discharge test voltage U3, U1> U2> U3, according to the following steps:
controlling the primary side of the three-phase electromagnetic voltage transformer to generate the induced withstand voltage test voltage U1 and maintaining the induced withstand voltage test voltage U1 for 40 s;
controlling the primary side of the three-phase electromagnetic voltage transformer to generate the partial discharge test pre-applied voltage U2 for more than 15 s;
and controlling the primary side of the three-phase electromagnetic voltage transformer to generate the partial discharge test voltage U3, and maintaining the partial discharge test voltage U3 for more than 1 min.
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