CN110726890A - Calibration method for direct-current charger of power plant - Google Patents
Calibration method for direct-current charger of power plant Download PDFInfo
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- CN110726890A CN110726890A CN201910956972.0A CN201910956972A CN110726890A CN 110726890 A CN110726890 A CN 110726890A CN 201910956972 A CN201910956972 A CN 201910956972A CN 110726890 A CN110726890 A CN 110726890A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention relates to a method for checking a direct current charger of a power plant, which is used for checking the voltage stabilization precision, the current stabilization precision and the ripple factor of the direct current charger and comprises the following steps: calculating the number of modules to be tested simultaneously according to the whole screen current value of the direct current charger and the output current of the load box; converting the current signal into a voltage signal through a series current divider, indirectly obtaining the output current and the output voltage of the direct current charger by observing the change of the voltage value, and judging the voltage stabilization precision and the current stabilization precision according to related regulations; and reading the peak-to-peak value under the corresponding voltage value by an external oscilloscope method, and further calculating the ripple factor. The invention uses the load box for operation, and has simple operation and higher accuracy; through the verification of multiple modules or the whole screen, the overall working state of the charger can be reflected more visually, more visual data are provided for equipment operation, meanwhile, the test time is greatly reduced, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of direct current charger calibration, and particularly relates to a calibration method of a power plant direct current charger.
Background
The dc system of power plant is mainly used for remote operation of switching equipment and power supply of important dc loads such as signal communication equipment, relay protection, automatic equipment, etc. The direct current system is one of the most important parts in the station service power of the power plant, and the direct current system can reliably and uninterruptedly supply power to the electric equipment of the direct current system in any accident situation. The direct current charger is an important part of a direct current system of a power plant, and the performance and the quality of the direct current charger are directly related to the stable operation and the equipment safety of power plant equipment.
The existing technology basically adopts a single-module calibration method, a single module is detached from a direct current screen or other modules are closed, a testing instrument is connected, and voltage stabilization precision, current stabilization precision and ripple factor tests of the single module are carried out.
Disclosure of Invention
The invention aims to provide a method for checking a direct current charger of a power plant, which aims to solve the technical problem.
The invention provides a method for checking a direct current charger of a power plant, which is used for checking the voltage stabilization precision, the current stabilization precision and the ripple factor of the direct current charger and comprises the following steps:
calculating the number of modules to be tested simultaneously according to the whole screen current value of the direct current charger and the output current of the load box;
converting the current signal into a voltage signal through a series current divider, indirectly obtaining the output current and the output voltage of the direct current charger by observing the change of the voltage value, and judging the voltage stabilization precision and the current stabilization precision according to related regulations;
and reading the peak-to-peak value under the corresponding voltage value by an external oscilloscope method, and further calculating the ripple factor.
By means of the scheme, the load box is used for operation through the checking method of the direct current charger of the power plant, the operation is simple, and the accuracy is high; through the verification of multiple modules or the whole screen, the overall working state of the charger can be reflected more visually, more visual data are provided for equipment operation, meanwhile, the test time is greatly reduced, and the working efficiency is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a functional block diagram of a power module.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiment provides a method for checking a power plant direct current charger, which comprises the steps of checking voltage stabilization precision, current stabilization precision and ripple coefficients, converting a current signal into a voltage signal by serially connecting a shunt, indirectly obtaining output current or output voltage of the direct current charger by observing the change of the voltage value, judging the precision according to related regulations, reading peak-to-peak values under corresponding voltage values by an external oscilloscope method, and further calculating the ripple coefficients. The method is operated by using the load box, and is simple to operate and high in accuracy. Through the verification of multiple modules or the whole screen, the overall working state of the charger can be reflected more visually, and more visual data is provided for the operation of equipment. The method realizes the aim of checking on site, and simultaneously can simultaneously test a plurality of modules and even the whole screen under the cooperation of instruments, thereby greatly reducing the test time and improving the working efficiency compared with the traditional single-module checking method.
The present invention is described in further detail below.
Fig. 1 is a functional block diagram of a power supply module, in which a primary side detection control circuit monitors the voltage of an ac input power grid to realize input overvoltage, undervoltage and open-phase protection functions and soft start control; the auxiliary power supply provides a working power supply for the control circuit and the monitoring circuit of the whole module; the EMI input filter circuit realizes the purification treatment of the input power supply, filters high-frequency interference and absorbs transient impact; the soft start part is used for eliminating startup surge current; the three-phase alternating current input power supply is converted into direct current through input three-phase rectification and filtering, the direct current is converted into high-frequency alternating current through the full-bridge conversion circuit, and the high-frequency alternating current is isolated by the main transformer, rectified by the full-bridge circuit and filtered to be converted into stable direct current output; the signal regulation and PWM control circuit realizes the control and regulation of output voltage and current and ensures the stability and reliability of the output voltage; the output measurement fault protection and microcomputer management part is responsible for monitoring output voltage, current and the working condition of the system, displaying the output voltage and current of the power supply to the front panel, realizing fault judgment and protection, coordinating various operations of the management module, communicating with the system and realizing high intelligence of the power supply module.
According to item 6.4 of DL/T459-. The method comprises the following specific steps:
(1) the current stabilization precision charging floating charging device has the advantages that under the charging (current stabilization) state, the alternating current input voltage changes within + 15% -10% of the rated voltage, the output voltage changes within the charging voltage regulation range, and the output current keeps stable precision at any value within the range of 20% -100% of the rated voltage.
(2) The voltage-stabilizing precision charging floating charging device has the alternating current input voltage which changes within + 15% -10% of the rated voltage in the floating charging (voltage-stabilizing) state. The output voltage is changed in the floating charge voltage regulation range, and the output current is changed in the rated range of 0-100%. The output voltage remains stable to any value within its regulation range.
(3) The ripple coefficient charging floating charge device is in a floating charge (voltage stabilization) state, the AC input voltage changes within + 15% -10% of the rated voltage, the output voltage is within any value of the floating charge voltage regulation range, and the ripple coefficients at two ends of the resistive load are measured.
According to item 13.2 of eighteen major anti-accident measures of power grids of national grid company, a newly-built or improved transformer substation selects a charging and floating charging device, and the technical requirements that the voltage stabilization precision is better than 0.5%, the current stabilization precision is better than 1% and the ripple coefficient of output voltage is not more than 1% are met. If the in-service charging and floating charging device does not meet the requirements, the device is gradually replaced. The charging and floating charging devices are required to be comprehensively checked regularly, the voltage stabilization precision, the current stabilization precision and the ripple factor of the devices are checked, the devices are not required to be regulated timely, and the requirements are met.
The test method of the invention comprises the following steps:
the method comprises the steps of calculating the number of modules to be tested simultaneously according to the whole screen current value of the direct current charger and the output current of a load box, converting a current signal into a voltage signal by serially connecting a shunt, indirectly obtaining the output current or the output voltage of the direct current charger by observing the change of the voltage value, judging the precision according to relevant regulations, reading the peak-to-peak value under the corresponding voltage value by an external oscilloscope method, and further calculating the ripple factor.
The following is field test data for checking a No. 1-10 direct current charging module of a certain power plant by adopting the test method of the invention:
table 11, 2, 3, 4, 5 dc charging module test data
TABLE 2 Voltage stabilization test and ripple factor test data
TABLE 3 Steady flow test data
Table 46, 7, 8, 9, 10 dc charging module test data
TABLE 5 Voltage stabilization test and ripple factor test data
TABLE 6 Steady flow test data
By adopting the test method, the whole screen is divided into two parts, and a voltage stabilization precision test, a current stabilization precision test and a ripple factor test are respectively carried out, and the test results show that the voltage stabilization test error of each direct current charging device meets the technical index of the maximum allowable error less than or equal to +/-0.5% specified in the standard; the steady flow test error meets the technical index that the maximum allowable error is less than or equal to +/-1.0 percent and is specified in the standard; the ripple coefficient meets the technical index that the maximum allowable error specified in the standard is less than or equal to 0.5 percent. According to the test, the method can shorten the field checking time by 3-4 times, avoid the damage of the charger module caused by disassembly, and lead the test result to be closer to the actual working condition.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (1)
1. A method for checking a direct current charger in a power plant is used for checking the voltage stabilization precision, the current stabilization precision and the ripple factor of the direct current charger, and is characterized by comprising the following steps:
calculating the number of modules to be tested simultaneously according to the whole screen current value of the direct current charger and the output current of the load box;
converting the current signal into a voltage signal through a series current divider, indirectly obtaining the output current and the output voltage of the direct current charger by observing the change of the voltage value, and judging the voltage stabilization precision and the current stabilization precision according to related regulations;
and reading the peak-to-peak value under the corresponding voltage value by an external oscilloscope method, and further calculating the ripple factor.
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| CN201910956972.0A CN110726890A (en) | 2019-10-09 | 2019-10-09 | Calibration method for direct-current charger of power plant |
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| CN201910956972.0A CN110726890A (en) | 2019-10-09 | 2019-10-09 | Calibration method for direct-current charger of power plant |
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