CN215116688U - Detection circuit for output voltage quality of variable frequency power supply for high-voltage test - Google Patents
Detection circuit for output voltage quality of variable frequency power supply for high-voltage test Download PDFInfo
- Publication number
- CN215116688U CN215116688U CN202120816897.0U CN202120816897U CN215116688U CN 215116688 U CN215116688 U CN 215116688U CN 202120816897 U CN202120816897 U CN 202120816897U CN 215116688 U CN215116688 U CN 215116688U
- Authority
- CN
- China
- Prior art keywords
- power supply
- variable frequency
- frequency power
- voltage
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The utility model belongs to the technical field of power supply power detection, in particular to a detection circuit of the output voltage quality of a variable frequency power supply for a high voltage test; the technical scheme is as follows: the device comprises a power supply filtering device, a detected variable frequency power supply and a voltage transformer; the input end of the power supply filter device is connected with a 380V power supply system, the output end of the power supply filter device is connected with the power supply interference generator and then is connected with the input end of the detected variable frequency power supply, and the output end of the detected variable frequency power supply is connected with the variable load device through a low-voltage output cable to form an output loop; the primary side of the voltage transformer is connected in parallel to the output loop and is connected with the output end of the detected variable frequency power supply, and the secondary side of the voltage transformer is connected with a voltage terminal of the waveform analyzer; the detected variable frequency power supply is connected with a variable frequency power supply control box; the utility model discloses practical high-efficient, the result is reliable.
Description
Technical Field
The utility model belongs to the technical field of power electric power detects, concretely relates to detection circuitry of variable frequency power supply output voltage quality for high-voltage testing.
Background
The variable frequency power supply is an important component device of a field high-voltage test system, and can convert a field commonly used three-phase 380V alternating current power supply into a single-phase alternating current power supply with adjustable voltage and frequency.
The traditional variable frequency power supply has various types, uneven price and quality, and immature product technology, and the field test cannot be carried out due to the fact that the output voltage quality of the traditional variable frequency power supply is too poor in field test; at present, no method and device for evaluating the output voltage quality of the variable frequency power supply exist in relevant use units, so that the quality of the output voltage of the variable frequency power supply is very necessary to be evaluated and checked.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art exists not enough, provides a detection circuitry to variable frequency power supply output voltage quality for high-voltage testing, through the variable load device interior circuit element parameter in the regulation test return circuit, simulates variable frequency power supply operation mode under different work condition, inspects its output voltage quality at several kinds of most representative operating modes. The quality of the output voltage mainly comprises the instability degree and the waveform distortion rate of the output voltage, and the quality of the output voltage is integrally verified by respectively evaluating and checking the two main indexes.
The two performance indexes are measured in the same test loop, and except for a variable frequency power supply of the tested equipment, other equipment used in the test loop, including a power analyzer, a variable load device, a high-voltage test line and the like, all use special equipment for high-quality and high-performance test. The method comprises the steps of obtaining two voltage index data under a working condition in each test, carrying out different assignments on the two voltage index data according to the influence degree of the two voltage index data on the output voltage quality of the variable-frequency power supply and a set standard value, finally carrying out weighted calculation on the two voltage index values, comprehensively judging the output power supply quality of the variable-frequency power supply, and powerfully guaranteeing the development of field work of a high-voltage test.
In order to solve the technical problem, the utility model discloses a technical scheme be: a detection circuit for the output voltage quality of a variable frequency power supply for a high voltage test comprises a power supply filtering device, a detected variable frequency power supply and a voltage transformer;
the input end of the power supply filter device is connected with a 380V power supply system, the output end of the power supply filter device is connected with the power supply interference generator and then is connected with the input end of the detected variable frequency power supply, and the output end of the detected variable frequency power supply is connected with the variable load device through a low-voltage output cable to form an output loop;
the primary side of the voltage transformer is connected in parallel to the output loop and is connected with the output end of the detected variable frequency power supply, and the secondary side of the voltage transformer is connected with a voltage terminal of the waveform analyzer;
and the detected variable frequency power supply is connected with a variable frequency power supply control box.
The 380V power supply system, the power supply filtering device, the power supply interference generator and the detected variable frequency power supply are connected through a low-voltage input cable.
And the variable frequency power supply control box is connected with the detected variable frequency power supply through a control optical fiber.
And the secondary side of the voltage transformer is connected with the input end of the waveform analyzer through a secondary test line.
The evaluation method of the detection circuit for the output voltage quality of the variable frequency power supply for the high voltage test comprises the following steps:
the first step is as follows: the detection requires constant ambient temperature and humidity, constant power supply capacity and stable output voltage, and the following steps are carried out under the condition that the detection environment and power supply quality data are kept unchanged;
the second step is that: connecting a 380V power supply system with a power supply filter device by using a low-voltage input cable, and connecting an output end of the power supply filter device with an input end of a power supply interference generator;
the third step: the output end of the power supply interference generator is connected with the input end of the detected variable frequency power supply by using a low-voltage input cable, the output end of the detected variable frequency power supply is connected with a variable load device by using a low-voltage output cable, and the detected variable frequency power supply can change a three-phase power supply into a single-phase power supply with adjustable voltage and frequency;
the fourth step: the primary winding of the voltage transformer is connected in parallel with the output loop of the detected variable frequency power supply, and the input end of the waveform analyzer is connected to the secondary winding of the voltage transformer through a secondary test wire;
the fifth step: the detected variable frequency power supply is connected with the variable frequency power supply control box through the control optical fiber, so that the output voltage and frequency are remotely controlled, and the low voltage and the high voltage are thoroughly isolated;
and a sixth step: adjusting the impedance value in the variable load device to a maximum value of 10 omega, and enabling the power factor angle to be 0 degree;
the seventh step: starting a test loop, and adjusting a power supply filter device to enable the output power supply voltage to be a standard 380V voltage waveform without any harmonic;
eighth step: after the output frequency of the detected variable frequency power supply is adjusted to be 300Hz at maximum, the output voltage is adjusted to be 350V at maximum by taking 5V as a pace;
the ninth step: the output of the variable frequency power supply reaches the maximum current 1142A by adjusting the impedance in the variable load device, the waveform analyzer calculates the output voltage waveform distortion rate THD1 of the detected variable frequency power supply,
the tenth step: keeping the maximum output voltage and the maximum output current of the tested variable frequency power supply, adjusting the power supply interference generator to enable the input voltage of the variable frequency power supply to fluctuate within +/-5%, calculating the instability degree delta U1% of the output voltage of the variable frequency power supply at the moment by the waveform analyzer,
the eleventh step: after the whole test is finished, reducing the output voltage and disconnecting the input of the variable frequency power supply through the variable frequency power supply control box;
the twelfth step: adjusting the property and the size of a load in the variable load device to enable the power factor angle to be 45 degrees, 90 degrees, 45 degrees and 90 degrees respectively;
the thirteenth step: repeating the seventh step to the tenth step to obtain the instability of the output voltage and the waveform distortion rate under each working condition, and respectively defining the instability and the waveform distortion rate as [ THD 2% ], [ Delta U2% ], [ THD 3% ], [ Delta U3% ], [ THD4, [ Delta U4% ], [ THD 5% ], [ Delta U5% ];
the fourteenth step is that: taking THD ═ max [ THD1, THD2, THD3, THD4 and THD5], and delta U% ═ max [ delta U1%, delta U2%, delta U3%, delta U4% and delta U5% ] respectively as final assessment index quantities of the tested variable frequency power supply;
the fifteenth step: defining characteristic values of all assessment indexes:
if THD is less than or equal to 2%, lambda 1 is 2; if 2% < THD ≦ 4%, λ 1 ═ 1; if 4% < THD, λ 1 ═ 0,
if delta U% is less than or equal to 0.5%, lambda 2 is 2; if the content of 0.5% < delta U% < 1%, lambda 2 ═ 1; if 1% < Δ U%, λ 2 ═ 0;
sixteenth, step: defining qualified conditions of the detected variable frequency power supply:
if min [ lambda 1 and lambda 2] is equal to 0, judging that the detected variable frequency power supply is unqualified, and finishing the comprehensive performance quality detection;
if min [ lambda 1, lambda 2] is not equal to 0, judging that the detected variable frequency power supply is qualified, and performing the next step;
seventeenth step: if min [ lambda 1, lambda 2] ≠ 0, defining the comprehensive performance index of the detected variable frequency power supply: λ 1+ λ 2;
and eighteenth step: grading the qualified detected variable frequency power supply:
if lambda is 2, defining the qualified grade of the tested variable frequency power supply,
if lambda is 3, defining the good grade of the tested variable frequency power supply,
if λ is 4, the excellent class of the tested variable frequency power supply is defined.
Compared with the prior art, the utility model beneficial effect who has is:
1. the utility model discloses simple and convenient, practical high-efficient, the result is reliable, through adopting the interior circuit element ratio of adjusting variable load device, the simulation is examined variable frequency power supply's various operating condition.
2. The utility model discloses a setting is examined variable frequency power supply, realizes examining variable frequency power supply's output voltage quality.
3. The utility model discloses a realization is to variable frequency power supply's output voltage quality testing work, and improve equipment reliability level guarantees that field test work develops smoothly.
Drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is the detection circuit diagram of the output voltage quality of the variable frequency power supply of the present invention.
In the figure: the system comprises a power supply filtering device 1, a detected variable frequency power supply 2, a voltage transformer 3, a 380V power supply system 4, a power supply interference generator 5, a low-voltage output cable 6, a variable load device 7, a waveform analyzer 8, a variable frequency power supply control box 9, a low-voltage input cable 10, a control optical fiber 11 and a secondary test wire 12.
Detailed Description
As shown in the figure, the detection circuit for the output voltage quality of the variable frequency power supply for the high-voltage test comprises a power supply filter device 1, a detected variable frequency power supply 2 and a voltage transformer 3;
the input end of the power supply filtering device 1 is connected with a 380V power supply system 4, the output end of the power supply filtering device 1 is connected with a power supply interference generator 5 and then is connected with the input end of a detected variable frequency power supply 2, and the output end of the detected variable frequency power supply 2 is connected with a variable load device 7 through a low-voltage output cable 6 to form an output loop;
the primary side of the voltage transformer 3 is connected in parallel to the output loop and is connected with the output end of the detected variable frequency power supply 2, and the secondary side of the voltage transformer 3 is connected with the voltage terminal of the waveform analyzer 8;
and the detected variable frequency power supply 2 is connected with a variable frequency power supply control box 9.
Preferably, the 380V power supply system 4, the power filter device 1, the power interference generator 5 and the detected variable frequency power supply 2 are connected through a low voltage input cable 10.
Preferably, the variable frequency power supply control box 9 is connected with the detected variable frequency power supply 2 through a control optical fiber 11.
Preferably, the secondary side of the voltage transformer 3 is connected with the input end of the waveform analyzer 8 through a secondary test line 12.
The evaluation method of the detection circuit for the output voltage quality of the variable frequency power supply for the high voltage test comprises the following steps:
the first step is as follows: the detection requires constant ambient temperature and humidity, constant power supply capacity and stable output voltage, and the following steps are carried out under the condition that the detection environment and power supply quality data are kept unchanged;
the second step is that: connecting a 380V power supply system 4 with a power supply filter device 1 by using a low-voltage input cable 10, and connecting the output end of the power supply filter device 1 with the input end of a power supply interference generator 5;
the third step: the output end of the power supply interference generator 5 is connected with the input end of the detected variable frequency power supply 2 by using a low-voltage input cable 10, the output end of the detected variable frequency power supply 2 is connected with a variable load device 7 by using a low-voltage output cable 6, and the detected variable frequency power supply 2 can change a three-phase power supply into a single-phase power supply with adjustable voltage and frequency;
the fourth step: the primary winding of the voltage transformer 3 is connected in parallel with the output loop of the detected variable frequency power supply 2, and the input end of the waveform analyzer 8 is connected to the secondary winding of the voltage transformer 3 through a secondary test wire 12;
the fifth step: the detected variable frequency power supply 2 is connected with a variable frequency power supply control box 9 through a control optical fiber 11, so that the output voltage and frequency are remotely controlled, and the low voltage and the high voltage are thoroughly isolated;
and a sixth step: adjusting the impedance value in the variable load device 7 to a maximum value of 10 omega, and making the power factor angle of the variable load device 0 degree;
the seventh step: starting a test loop, and adjusting the power supply filter device 1 to enable the output power supply voltage to be a standard 380V voltage waveform without any harmonic;
eighth step: after the output frequency of the detected variable frequency power supply 2 is adjusted to be 300Hz at the maximum, the output voltage is adjusted to be 350V at the maximum by taking 5V as a pace;
the ninth step: the output of the variable frequency power supply reaches the maximum current 1142A by adjusting the impedance in the variable load device 7, the waveform analyzer 8 calculates the output voltage waveform distortion rate THD1 of the detected variable frequency power supply 2,
the tenth step: keeping the maximum output voltage and the maximum output current of the tested variable frequency power supply 2, adjusting the power supply interference generator 5 to enable the input voltage of the variable frequency power supply to fluctuate within +/-5%, calculating the instability degree delta U1% of the output voltage of the variable frequency power supply at the moment by the waveform analyzer 8,
the eleventh step: after the whole test is finished, reducing the output voltage and disconnecting the input of the variable frequency power supply through the variable frequency power supply control box 9;
the twelfth step: adjusting the property and the size of the load in the variable load device 7 to ensure that the power factor angles are 45 degrees, 90 degrees, 45 degrees and 90 degrees respectively;
the thirteenth step: repeating the seventh step to the tenth step to obtain the instability of the output voltage and the waveform distortion rate under each working condition, and respectively defining the instability and the waveform distortion rate as [ THD 2% ], [ Delta U2% ], [ THD 3% ], [ Delta U3% ], [ THD4, [ Delta U4% ], [ THD 5% ], [ Delta U5% ];
the fourteenth step is that: taking THD ═ max [ THD1, THD2, THD3, THD4, THD5], Δ U% ═ max [ Δ U1%, Δ U2%, Δ U3%, Δ U4%, and Δ U5% ] respectively as final assessment index quantities of the detected variable frequency power supply 2;
the fifteenth step: defining characteristic values of all assessment indexes:
if THD is less than or equal to 2%, lambda 1 is 2; if 2% < THD ≦ 4%, λ 1 ═ 1; if 4% < THD, λ 1 ═ 0,
if delta U% is less than or equal to 0.5%, lambda 2 is 2; if the content of 0.5% < delta U% < 1%, lambda 2 ═ 1; if 1% < Δ U%, λ 2 ═ 0;
sixteenth, step: defining qualified conditions of the tested variable frequency power supply 2:
if min [ lambda 1 and lambda 2] is equal to 0, judging that the detected variable frequency power supply 2 is unqualified, and finishing the comprehensive performance quality detection;
if min [ lambda 1, lambda 2] is not equal to 0, judging that the detected variable frequency power supply 2 is qualified, and performing the next step;
seventeenth step: if min [ lambda 1, lambda 2] ≠ 0, defining the comprehensive performance index of the detected variable frequency power supply 2: λ 1+ λ 2;
and eighteenth step: and (3) grading the qualified tested variable frequency power supply 2:
if lambda is 2, defining the qualified grade of the tested variable frequency power supply 2,
if lambda is 3, defining the good grade of the tested frequency conversion power supply 2,
if λ is 4, the class of the tested variable frequency power supply 2 is defined as excellent.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to 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 will be appreciated that those skilled in the art, upon attaining an understanding of the foregoing may readily produce alterations to, variations of, and equivalents to these embodiments without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (4)
1. A detection circuit for the output voltage quality of a variable frequency power supply for a high voltage test is characterized by comprising a power supply filter device (1), a detected variable frequency power supply (2) and a voltage transformer (3);
the input end of the power supply filtering device (1) is connected with a 380V power supply system (4), the output end of the power supply filtering device (1) is connected with a power supply interference generator (5) and then is connected with the input end of a detected variable frequency power supply (2), and the output end of the detected variable frequency power supply (2) is connected with a variable load device (7) through a low-voltage output cable (6) to form an output loop;
the primary side of the voltage transformer (3) is connected in parallel to the output loop and is connected with the output end of the detected variable frequency power supply (2), and the secondary side of the voltage transformer (3) is connected with the voltage terminal of the waveform analyzer (8);
and the detected variable frequency power supply (2) is connected with a variable frequency power supply control box (9).
2. The circuit for detecting the output voltage quality of the variable frequency power supply for the high voltage test according to claim 1, wherein the 380V power supply system (4), the power supply filter device (1), the power supply interference generator (5) and the variable frequency power supply (2) to be detected are connected through a low voltage input cable (10).
3. The circuit for detecting the output voltage quality of the variable frequency power supply for the high voltage test according to claim 2, wherein the variable frequency power supply control box (9) is connected with the variable frequency power supply (2) to be detected through a control optical fiber (11).
4. The detection circuit for the output voltage quality of the variable frequency power supply for the high voltage test according to claim 3, wherein the secondary side of the voltage transformer (3) is connected with the input end of the waveform analyzer (8) through a secondary test line (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120816897.0U CN215116688U (en) | 2021-04-20 | 2021-04-20 | Detection circuit for output voltage quality of variable frequency power supply for high-voltage test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120816897.0U CN215116688U (en) | 2021-04-20 | 2021-04-20 | Detection circuit for output voltage quality of variable frequency power supply for high-voltage test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215116688U true CN215116688U (en) | 2021-12-10 |
Family
ID=79265723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120816897.0U Active CN215116688U (en) | 2021-04-20 | 2021-04-20 | Detection circuit for output voltage quality of variable frequency power supply for high-voltage test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215116688U (en) |
-
2021
- 2021-04-20 CN CN202120816897.0U patent/CN215116688U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102305893B (en) | Method and device for checking power-factor angle of high voltage line of intelligent substation on site | |
| CN105182126B (en) | Improved distribution transformer energy efficiency metering detection method | |
| CN109001573B (en) | Method for determining short-circuit capacity of collector bus of wind power plant | |
| CN108318852A (en) | A kind of intelligent electric energy meter square wave influence test method | |
| US5539651A (en) | Apparatus and method for determining the effects of harmonics on electric power systems | |
| CN103675749A (en) | Performance detector of electric energy meter under direct current and even harmonic conditions | |
| CN103293504A (en) | On-site current transformer comprehensive detector and testing method thereof | |
| CN106483397A (en) | A kind of electric energy quality detection device of high accuracy high bandwidth and measuring method | |
| Abidullah et al. | Real-time power quality signals monitoring system | |
| CN107219415A (en) | A kind of system and method for dry-type air-core reactor Universal electric performance parameter test | |
| CN215116688U (en) | Detection circuit for output voltage quality of variable frequency power supply for high-voltage test | |
| Abidullah et al. | Real-time power quality disturbances detection and classification system | |
| CN116794587A (en) | Method for measuring high-voltage error of low-frequency voltage transformer by using standard capacitor | |
| CN115219941A (en) | Detection circuit and evaluation method for output voltage quality of variable frequency power supply for high voltage test | |
| CN203250017U (en) | On-site current transformer comprehensive detection device | |
| CN107202969B (en) | The combined electronic mutual inductor distortional wave meter characteristic calibrating installation of three-phase | |
| CN215375595U (en) | Ground net ground resistance tester that tests is carried out through inside and outside power of instrument | |
| CN111562475B (en) | Variable frequency power supply partial discharge detection circuit for high-voltage test and evaluation method | |
| CN213023534U (en) | Calibration device for capacity tester based on distorted waveform voltage | |
| CN109839536B (en) | Transformer substation CVT harmonic measurement judgment device | |
| Bucci et al. | A digital instrument for light flicker effect evaluation | |
| Marcus et al. | The influence of the network impedance on the nonsinusoidal (harmonic) network current and flicker measurements | |
| CN211653119U (en) | System for carrying out broadband verification on all-fiber current transformer | |
| CN215116684U (en) | Detection circuit for variable frequency power supply power curve for high-voltage test | |
| CN201083813Y (en) | Electric motor intelligence test apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |